JP2007242681A - Electronic component storage case - Google Patents

Abstract

Provided is an electronic component housing case capable of smoothly engaging a first member and a second member constituting a case and maintaining an engaged state firmly.
An engagement protrusion 151 of a base member has a plate shape, and has a notch 515 on a longitudinal side surface, a slit 517 in a central longitudinal direction, and a notch 513 in the middle thereof. The engaging protrusion 139 of the cap member has protrusions 137 and 138 and engages with the notches 513 and 515, respectively. The notches 513 and 515 having a shape along the imaginary line having the centers C3 and C1 at the positions of the distances H3 and H1 from the horizontal line LH are portions forming an outline along the imaginary line having the centers C4 and C2 at the positions of the distances H4 and H2. Since the protrusions 138 and 137 are closer to the horizontal line LH than the protrusions 138 and 137, the protrusions 137 and 138 are pressed toward the horizontal line LH by the drag from the notches 513 and 515 when they are engaged. Is maintained.
[Selection] Figure 13

Description

  The present invention relates to an electronic component housing case for housing an electronic component inside a case composed of two members.

  An electronic component storage case for storing an electronic component has various sizes, shapes, features, and the like depending on the use of the electronic component. For example, an electronic component housing case that houses a detection element (corresponding to an electronic component) that detects a liquid state is attached to the base side member (base member), and the cap side so as to cover the periphery of the detection element. By covering this member (cap member) and engaging with the base member, the detection element is accommodated in the electronic component housing case.

  When an electronic component storage case containing such a detection element is attached to the liquid storage container, the cap member side is inserted into the liquid storage container in order to place the detection element in the liquid storage container, and the base member side is the outer wall of the liquid storage container Fixed to. Since the insertion hole of the liquid container for inserting the cap member side is sealed by an O-ring provided in the base member, the cap member is engaged with the base member on the inner peripheral side of the O-ring. Become. For this reason, when the electronic component storage case is attached to the liquid storage container, the entire cap member is disposed in the liquid storage container, and the cap member and the base member are firmly engaged. It is preferable.

Therefore, the cap member is formed in a bottomed cylindrical shape, the arrangement portion of the detection element of the base member is formed in a pedestal shape, the cap member is covered with the arrangement portion together with the detection element, and the portion near the opening end of the cap member is arranged on the arrangement portion. Fit to the outer periphery. At this time, a groove-like recess is provided around the inner periphery of the base member near the opening end thereof along the circumferential direction, and a protrusion-like protrusion is provided around the outer periphery of the base member arrangement portion along the circumferential direction. Provide a part. And if a recessed part and a convex part are engaged, since a cap member will be latched by the arrangement | positioning part of a base member over a perimeter, a cap member will not remove | deviate from a base member within a liquid storage container (for example, patent) Reference 1).
German Patent Application No. 4236320 A1

  However, when the cap member and the base member are engaged as in Patent Document 1, when the concave portion of the cap member is engaged with the convex portion of the base member, the portion near the opening end of the cap member extends over the entire circumference. It will be pressed to spread. Since it is difficult to deform such that the inner diameter near the opening end is increased, it is necessary to apply a large force to engage the cap member and the base member. Since the electronic component housing case is usually formed from a resin, there is a possibility that cracks, chips, etc. may occur at the engaging portions of the two parts by applying an excessive force.

  The present invention has been made to solve the above-mentioned problems, and can smoothly engage the first member and the second member that constitute the case, and can strengthen the engagement state. An object is to provide an electronic component housing case that can be maintained.

  In order to achieve the above object, an electronic component housing case according to a first aspect of the present invention includes an engagement protrusion that extends in a plate shape provided on one of the two members, at least one of which is made of resin. A case composed of the first member and the second member is configured by engaging with an engaging protrusion provided on the other second member, and the inside of the case, or the first member or the second member An electronic component housing case for housing an electronic component in any one of the above, wherein the engaging protrusion of the first member is formed in a plate shape whose longitudinal direction is the protruding direction from the first member. , A first notch portion in which both end portions on the long side of the engaging protrusion piece are cut out in an arc shape inward at predetermined positions, and a center position in the short direction at the tip end of the engaging protrusion piece A slit notched to a predetermined distance from the base toward the base end of the engagement protrusion And a second cutout portion in which the slit is cut out in an arc shape in the width direction at a predetermined position on the slit, and the engagement protrusion of the second member is Projecting from the surface of each of the second members, the first projecting portions are arranged in a one-to-one relationship inside the first cutout portions and engage with the first cutout portions. And a second protrusion that is disposed inside the second notch and engages with the second notch, and the engagement protrusion and the engagement protrusion are engaged with each other. A first straight line that passes through the center of the engaging protrusion in the short direction and is parallel to the longitudinal direction when viewed from one plate surface side of the engaging protrusion; When the reference point is the intersection point of the second straight line parallel to the short direction of the engaging protrusion at the base end side edge of The first notch is along a virtual circle having a radius R1 centered at a distance L1 from the reference point along the second straight line and a distance H1 from the reference point along the first straight line. A notched shape is formed, and the second notch portion has a radius R3 centered on a position separated by a distance H3 along the first straight line from the reference point toward the distal end side of the engaging protrusion. A shape that is cut out along a circle, and the first protrusion is a distance L2 from the reference point along the second straight line and a distance H2 from the reference point along the first straight line. The second protrusion is separated from the reference point by a distance H4 along the first straight line from the reference point to the tip side of the engagement protrusion. It includes a part having an outer shape along a virtual circle with a radius R4 centered on the position. Thus, the relationship of H1 <H2 and H3 <H4 is satisfied.

  In addition to the configuration of the invention according to claim 1, the electronic component housing case of the invention according to claim 2 is such that L1> L2 in a state where the engagement protrusion and the engagement protrusion are engaged with each other. It is characterized by satisfying the relationship.

  In addition to the configuration of the invention according to claim 1 or 2, the electronic component housing case of the invention according to claim 3 is the R1 in the state where the engagement protrusion and the engagement protrusion are engaged with each other. > R2 and R3> R4 are satisfied.

  According to a fourth aspect of the present invention, there is provided an electronic component housing case, in addition to the configuration of the first aspect of the present invention, the electronic component includes a detection element that detects a liquid state. One of the member and the second member is formed with a flow hole through which liquid flows between the inside and the outside of the electronic component housing case.

  In the electronic component housing case according to the first aspect of the present invention, in the state where the engaging protrusion provided on the first member and the engaging protrusion provided on the second member are engaged, the first protrusion is the second It arrange | positions in the position which is far from a 1st notch part in the direction in alignment with a 1st straight line with respect to a straight line, Furthermore, a 2nd protrusion part is also a position far from a 2nd notch part in the direction in alignment with a 1st straight line with respect to a 2nd line. To be placed in. The distance between the 1st notch part and 2nd notch part formed in the engagement protrusion and the 2nd straight line is not changed, and when the engagement protrusion and the engagement protrusion are engaged, this configuration Each of the first protrusion and the second protrusion receives a drag force directed from the first cutout and the second cutout toward the second straight line along the first straight line. That is, the engagement protrusion formed with the first protrusion and the second protrusion, and thus the second member, approaches the second straight line, that is, the first member, due to the engagement between the engagement protrusion and the engagement protrusion. It will receive good pressure. Therefore, when the engagement protrusion and the engagement protrusion are engaged, the second force is generated based on the drag generated between the first protrusion and the second protrusion and the first notch and the second notch. The member can be pressed in the direction toward the first member, and the engagement between them can be maintained firmly.

  Moreover, by providing a slit in the engagement protrusion and bifurcating the tip end, the rigidity can be lowered and the bending can be facilitated. When the first protrusion and the second protrusion are engaged with the first notch and the second notch, respectively, the first protrusion and the second protrusion abut against the distal end side of the engaging protruding piece and receive drag, but the distal end side is bent. The drag can be reduced. Thereby, the pressing force required when engaging the engagement protrusion and the engagement protrusion is reduced, and the engagement between the first member and the second member can be performed smoothly. Since the first member itself does not need to bend if the engagement protrusions are bent in this way, the first member does not deform in its shape, causing problems such as cracking and chipping. There is no fear.

  And like the invention which concerns on Claim 2, in the state which the engagement protrusion provided in the 1st member and the engagement protrusion provided in the 2nd member engaged, the 1st projection part is the 1st notch part By arranging the first projection portion closer to the first straight line, the first protrusion is in a state in which a pressing force is applied to the first notch in a direction approaching the first straight line, and the two are securely engaged with each other. can do. Moreover, since the slit is formed in the engagement protrusion as described above, the front end side of the engagement protrusion is in the direction of narrowing the width of the slit by pressing the first protrusion through the first notch. Will be pressed. On the other hand, the second protrusion is engaged with the second notch formed in the slit, but the second notch sandwiches the second protrusion more reliably by reducing the width of the slit. Thereby, engagement with a 2nd projection part and a 2nd notch part is also made reliably, and engagement with a 1st member and a 2nd member can be maintained firmly.

  Further, as in the invention according to claim 3, the radius R2 of the virtual circle that forms the shape of the first protrusion is smaller than the radius R1 of the virtual circle that forms the shape of the first notch. By doing so, it is possible to make it easier to fit the first protrusion in the recess that forms the shape of the first notch. Similarly, by making the radius R4 of the virtual circle that is the basis of the shape of the second protrusion smaller than the radius R3 of the virtual circle that is the basis of the shape of the second notch, It is possible to easily store the second protrusion in the recess having the shape. Therefore, it is possible to improve the catch of the first protrusion and the second protrusion with respect to the first notch and the second notch, and to prevent the engagement from being disengaged when receiving an external force. be able to. Thereby, engagement with an engagement protrusion and an engagement protrusion part, ie, engagement with a 1st member and a 2nd member, can be performed more reliably.

  In addition, since the formation positions and sizes of the first notch part and the second notch part and the first protrusion part and the second protrusion part have a certain relationship, not only the engagement due to the coincidence of the shapes. The pressing force can be generated so that the engaged state is maintained. For this reason, even if the manufacturing tolerance of the engagement protrusion and the engagement protrusion is set to be wide, both can be sufficiently engaged, and the production cost can be reduced.

  In the invention according to claim 4, a detection element for detecting a liquid state as an electronic component is housed in the electronic component housing case, and the electronic component housing case is used as a housing of a detection device for detecting the liquid state. I have specified that. And by providing a flow hole in one of the first member or the second member constituting the case, the liquid can be circulated between the inside and the outside of the electronic component housing case. The change in the liquid state can be reliably detected using the detection element.

  Hereinafter, an embodiment of an electronic component housing case embodying the present invention will be described with reference to the drawings. In the present embodiment, the housing 110 of the liquid level sensor 100 that houses a level detection element that detects the liquid level of the liquid is shown as an example of an electronic component housing case, and the structure thereof will be described. The structure will be described with reference to FIGS.

  FIG. 1 is a perspective view of the liquid level sensor 100 as viewed from the front, right side, and plane. FIG. 2 is a right side view of the liquid level sensor 100. FIG. 3 is a plan view of the liquid level sensor 100. FIG. 4 is a cross-sectional view of the liquid level sensor 100 in a state attached to the bottom OP of the oil pan of the automobile as seen from the direction of the arrows along the one-dot chain line AA in FIG. FIG. 5 is a plan view of the level detection element 160 made of a film electrode substrate. FIG. 6 is a perspective view of the support member 200 that supports the level detection element 160 as seen from the front, left side, and plane. FIG. 7 is a perspective view of the liquid level sensor 100 showing a state where the cap member 120 is being assembled to the base member 140 as seen from the front, right side, and plane. FIG. 8 is a right side view of the liquid level sensor 100 showing a state where the cap member 120 is being assembled to the base member 140.

  As shown in FIGS. 1 to 3, the liquid level sensor 100 of the present embodiment is made of a resin base member 140 containing glass fibers and a resin containing glass fibers, and protrudes from the base member 140. A level detection element 160 (see FIG. 4) for detecting the level of the liquid is housed in the housing 110 constituted by the substantially cylindrical cap member 120 arranged as described above. The liquid level sensor 100 is attached to an oil pan of an automobile engine, for example, and is used to detect the level of oil accumulated in the oil pan. Specifically, as shown in FIG. 4, the cap member 120 that houses the level detection element 160 is inserted into the oil pan, and the front end portion of the cap member 120 is aligned with the vertical direction V of the axis member O. The base member 140 is used by being assembled to the bottom OP of the oil pan so that 122 is vertically upward, and the level of the oil OL is detected. The base member 140 and the cap member 120 correspond to the “first member” and the “second member” in the present invention, respectively, and the housing 110 corresponds to the “electronic component housing case” in the present invention. Further, in the present embodiment, the level detection element 160 will be described as equivalent to the “electronic component” in the present invention.

  First, the level detection element 160 will be described. The level detection element 160 shown in FIG. 5 has a form of a known film electrode substrate in which an electrode made of a conductive material such as copper is sealed in a flexible resin film made of polyimide. The level detection element 160 has a relatively wide wide rectangular portion 161, a tapered trapezoidal tapered portion 162, and a comparison in order from the base end (lower end in the figure) to the front end (upper end in the figure) in the longitudinal direction. A narrow rectangular portion 163 having a narrow width is continuously arranged. In the film, five electrodes, that is, a pair of reference electrodes 171, 172, a pair of detection electrodes 173, 174, and a ground electrode 175 are arranged on a plane.

  The pair of detection electrodes 173 and 174 are arranged from the elongated rectangular portion 163 to the taper portion 162 of the level detection element 160 so as to be substantially parallel with a predetermined interval along the longitudinal direction of the level detection element 160. . The detection electrode 173 has a substantially U shape that is folded back at the front end side of the level detection element 160 so as to face both ends of the linear detection electrode 174 in the longitudinal direction, and an oil OL (FIG. 4) is formed between the two electrodes. The capacitor whose capacitance changes in accordance with the liquid level of the reference) is configured. The detection electrodes 173 and 174 are electrically connected to respective rectangular electrode terminals 183 and 184 formed at the base end as potential extraction ports via lead portions 178 and 179, respectively.

  In addition, the pair of reference electrodes 171 and 172 are comb-shaped and meshed with each other in the wide rectangular portion 161 of the level detection element 160, and are arranged at a predetermined interval. The reference electrodes 171 and 172 are arranged at positions that are always immersed in the oil OL (see FIG. 4), and constitute a capacitor whose capacitance changes between both electrodes according to the dielectric constant of the oil OL. In the same manner as described above, the reference electrodes 171 and 172 are electrically connected to the respective rectangular electrode terminals 181 and 182 formed at the base end as potential extraction ports via the lead portions 176 and 177, respectively.

  In addition, a ground electrode 175 is disposed around the level detection element 160 so as to surround the reference electrodes 171 and 172 and the detection electrodes 173 and 174. The ground electrode 175 has a specific dielectric constant of a resin cap member 120 that houses the level detection element 160 and a support member 200 described later that supports the level detection element 160 in the cap member 120. This is for preventing the influence of parasitic capacitance when measuring the capacitances of 172 and detection electrodes 173 and 174. The ground electrode 175 is electrically connected to an electrode terminal 185 provided in a rectangular shape on the base end side of the level detection element 160.

  The electrode terminals 181 to 185 are aligned in a line in the width direction on the base end side of the level detection element 160, and the position on the film corresponding to each electrode terminal is positioned on the plane side of the level detection element 160 (this surface is used for convenience). The electrode terminals 181 to 185 are exposed at “main surface 165”. At the center of each electrode terminal 181 to 185, a hole for inserting and soldering a lead terminal 156 (see FIG. 4) for electrical connection with a wiring board 155 described later is opened.

  In addition, an oblong mounting hole 191 having a major axis in the longitudinal direction of the level detection element 160 is provided in the center in the width direction near the tip of the ground electrode 175 in the elongated rectangular portion 163. The mounting hole 191 is provided for positioning when the level detection element 160 is assembled to the support member 200 described later and for supporting the assembly after the assembly. The same mounting hole 192 is also provided on the ground electrode 175 in the tapered portion 162. Are provided in two places.

  Next, the support member 200 will be described. The support member 200 shown in FIG. 6 has the longitudinal direction of the film-shaped level detection element 160 described above, that is, the extending direction of the detection electrodes 173 and 174 (see FIG. 5), assembled into the oil pan of the liquid level sensor 100. It is a member for supporting the level detection element 160 upright on the base member 140 so as to be in the vertical direction V (see FIG. 4). The support member 200 is made of 66 nylon and has a back plate portion 201 that approximates the planar shape of the level detection element 160. The support member 200 is formed with a frame-shaped outer frame portion 202 in which both ends on the longitudinal side of the back plate portion 201 are folded back toward the mounting surface side of the level detection element 160. On the back plate 201, a back surface 166 (see FIG. 4) opposite to the main surface 165 of the level detection element 160 is disposed to face the reference electrode 171, 172 and the detection electrodes 173, 174 (see FIG. 5). An electrode exposure hole 207 that penetrates the plate surface is formed at a position facing the formation position so as not to cover the electrodes. On the base end side of the support member 200, the outer frame portion 202 is widened on both sides in the thickness direction of the back plate portion 201, and fixing claws 208 for fixing itself to the base member 140 are formed on the outer surface. .

  In addition, a pair of claw portions 203 projecting inward from each other are provided on the inner surface side of the outer frame portion 202, and the back plate portion 201 and the claw portion 203 are arranged so that the level detection element 160 does not float from the back plate portion 201. The edge portion of the elongated rectangular portion 163 (see FIG. 5) of the level detection element 160 is sandwiched therebetween. Further, the back plate 201 is provided with an upper support pin 204 that engages with the attachment hole 191 of the level detection element 160 and a center support pin 205 that engages with the two attachment holes 192. The level detection element 160 is supported by the back plate portion 201 by performing ultrasonic welding on the upper support pin 204 and the center support pin 205. Further, at the base end of the back plate portion 201, two element clamping portions 206 are projected from the surface side to which the level detection element 160 is attached. In a state in which the level detection element 160 is supported by the support member 200, the portion where the electrode terminals 181 to 185 of the wide rectangular portion 161 are formed is in the thickness direction of the back plate portion 201, that is, horizontal when assembled to the base member 140. It is bent toward the direction H (see FIG. 4). Furthermore, the base end is clamped by the element clamping unit 206.

  Next, the cap member 120 will be described. The cap member 120 is made of 66 nylon and has an internal space for accommodating the level detection element 160 extending in the direction of the axis O as shown in FIG. The cap member 120 has a bottomed cylindrical shape that is open on the base end portion 121 side that is located on the base member 140 side and that is closed on the front end portion 122 side. As shown in FIG. 3, the cap member 120 has a substantially rectangular shape with the width direction in the left-right direction in plan view, and as shown in FIG. 1, on the front and rear side surfaces from the front end portion 122 to the central portion 123. The center in the width direction swells in an arc shape (see FIG. 3). The base end portion 121 is formed wider than the tip end portion 122 and the central portion 123 in accordance with the shape of the level detection element 160 and the support member 200 housed therein (see FIGS. 5 and 6).

  Further, as shown in FIG. 4, a bulging portion 130 whose outer periphery further bulges outward is formed at a portion near the opening end of the base end portion 121. The front side bulge portion 132 constituting a part of the bulge portion 130 is formed so as to bulge outward on the front surface 126 side of the cap member 120 facing the back surface 166 side of the level detection element 160. Similarly, the rear side bulging part 131 constituting a part of the bulging part 130 is configured to bulge outward on the back surface 125 side of the cap member 120 facing the main surface 165 side of the level detection element 160. ing. Further, as shown in FIG. 3, on the left and right sides of the base end portion 121, there are a left bulge portion 134 and a right bulge portion 133 having a through hole 136 penetrating in the direction of the axis O (the front and back direction in FIG. 3). Is formed. The front bulge portion 132, the left bulge portion 134, the rear bulge portion 131, and the right bulge portion 133 are connected to each other. The bulge portion 130 surrounds the outer periphery of the base end portion 121 and has an annular shape. It is configured to make.

  By the way, as shown in FIGS. 3 and 4, a sensor that houses a temperature sensor 154 (see FIG. 4) at a position facing the central portion in the width direction of the base end 121 on the front surface 126 side of the cap member 120. The housing protrusion 143 is erected from the upper surface 147 of the base member 140. The front bulging portion 132 is formed with a sensor insertion hole 135 through which the sensor housing protrusion 143 is inserted. On the other hand, in the rear side bulging portion 131, a position that is symmetric with respect to the position where the sensor insertion hole 135 is formed in the front side bulging portion 132 is formed in a concave shape. At this position, an upper wall 124 having a back surface 125 continuous in the horizontal direction is provided, and the base end portion of the level detection element 160 disposed below the upper wall 124 is protected from exposure to the outside. ing.

  As shown in FIG. 1, in the vicinity of the opening end of the front bulging portion 132 of the cap member 120, the surrounding oil OL is composed of the cap member 120 inside and outside (that is, the cap member 120 and the base member 140. Two flow holes 127 for flowing into and out of the internal space are provided symmetrically. Further, a similar flow hole 127 is provided at a position where the rear bulge portion 131 is symmetrical with respect to the position where the flow hole 127 of the front bulge portion 132 is formed. Further, between the two flow holes 127 of the front bulge portion 132, a flow hole 128 for flowing oil OL into and out of the sensor insertion hole 135 is also formed. A communication hole 129 for venting air is formed at the distal end portion 122 of the cap member 120.

  The right bulged portion 133 and the left bulged portion 134 are provided with an engagement structure between a cap member 120 and a base member 140, which will be described later, and are formed in the rear bulged portion 131 and the front bulged portion 132. The circulation hole 127 is arranged at a position avoiding the engagement structure. Thereby, the flow of the liquid (oil OL) through the flow hole 127 is not hindered by the engagement structure.

  Next, the base member 140 will be described. As described above, the base member 140 is a member that holds the cap member 120 and the support member 200 that supports the level detection element 160 and fixes itself to the bottom OP (see FIG. 4) of the oil pan. As shown in FIG. 4, the base member 140 includes a base body 141, a connector part 142 including a connector terminal 157 for connecting to an external device (for example, ECU) (not shown), and each electrode terminal 181 of the level detection element 160. ˜185 (see FIG. 6) and a wiring board 155 interposed between the connector terminals 157.

  The wiring board 155 is mounted with a circuit for detecting the level of the oil OL based on the capacitance detected by the level detection element 160, and is provided on the bottom surface 146 side (lower side in the figure) of the base main body 141. It is accommodated in a substrate accommodating portion 145 formed in a concave shape. The wiring board 155 and the electrode terminals 181 to 185 of the level detection element 160 described above are electrically connected via five lead terminals 156 corresponding to the terminals integrated with the base member 140. The connector terminal 157, the lead terminal 158 of the temperature sensor 154, and the like are soldered to the wiring board 155. The substrate housing portion 145 that houses the wiring substrate 155 is filled with resin and is closed by a lid portion 144 made of a metal such as aluminum.

  As shown in FIG. 3, three attachment holes 148 through which screws are inserted when the base member 140 is attached to the bottom OP of the oil pan are arranged at equal intervals on the outer edge of the base main body 141. An annular recess 149 for disposing the annular packing 150 is provided in a groove shape on the upper surface 147 of the base main body 141 on the inner peripheral side of the mounting hole 148, and this structure provides a bottom portion of the oil pan. Liquid tightness when the base member 140 is attached to the OP is maintained.

  Next, as shown in FIG. 7, a pair of fixed protrusions 159 are provided on the upper surface 147 of the base member 140 on the inner peripheral side of the recess 149. The fixing protrusion 159 is a protrusion for fixing the support member 200 that supports the level detection element 160 in an upright state, and is disposed so as to sandwich the base end side of the outer frame portion 202 of the support member 200 from the outside. A fixing claw 208 (see FIG. 6) provided in the frame portion 202 is engaged. In a state where the support member 200 is fixed to the fixing protrusion 159, as shown in FIG. 4, the back surface 166 side of the level detection element 160 supported by the support member 200 faces the front side (left side in the figure) of the liquid level sensor 100. It will be in the state. The above-described sensor housing protrusion 143 is erected further forward from the fixing position of the support member 200. The temperature sensor 154 (see FIG. 4) is housed inside and protrudes into the oil OL to measure the temperature of the oil OL. Can be done.

  Further, as shown in FIG. 7, the two fixed protrusions 159 are inserted into through holes 136 formed in the right bulge portion 133 and the left bulge portion 134 of the cap member 120 on the outer side (outer peripheral side). The plate-like engagement protrusions 151 are provided. As shown in FIG. 8, the engaging protrusion 151 has notches 513 and 515, engages with an engaging protrusion 139 including protrusions 137 and 138 provided in the through hole 136, and the cap member 120. And the base member 140 are constituted.

  Hereinafter, the engagement structure between the cap member 120 and the base member 140 by the engagement between the engagement protrusion 139 and the engagement protrusion 151 will be described with reference to FIGS. 9 to 13. FIG. 9 is an enlarged view of the vicinity of the through hole 136 formed in the right-side bulged portion 133 in the plan view of the liquid level sensor 100 shown in FIG. 3, and shows a state in which the engagement protrusion 151 is not engaged. FIG. FIG. 10 shows a state in which the projections 137 and 138 of the through hole 136 and the notches 513 and 515 of the engagement protrusion 151 are engaged when viewed from the direction of the arrows along the one-dot chain line BB shown in FIG. It is sectional drawing. FIG. 11 illustrates the outline of the engaging protrusion 151 as viewed from the direction of the arrow in the alternate long and short dash line BB shown in FIG. It is a figure shown in the state of non-engagement. FIG. 12 illustrates the outline of the engaging protrusion 139 as viewed from the direction of the arrow in the alternate long and short dash line BB in FIG. 3 to describe the outer shape of the engaging protrusion 139. It is a figure shown in the state of non-engagement. FIG. 13 shows the outline of the engaging protrusion 151 of FIG. 11 in order to explain the positional relationship between the notches 513 and 515 of the engaging protrusion 151 and the protrusions 137 and 138 of the engaging protrusion 139. It is the figure which displayed the outline of the engagement protrusion part 139 of this.

  In the following, the engagement structure of the engagement protrusion 139 provided in the through hole 136 formed in the right bulge portion 133 of the cap member 120 and the engagement protrusion 151 inserted in the through hole 136 is described. Will be described. The engagement structure is formed so as to be symmetric with respect to the internal space of the cap member 120. The through hole 136 of the left bulge portion 134 of the cap member 120 and the engagement protrusion inserted into the through hole 136 are provided. 151 is the same as the engagement structure with 151. Here, the engagement structure in the right bulge portion 133 of the cap member 120 will be described, and the description of the engagement structure in the left bulge portion 134 will be omitted.

  The engaging protrusions 151 shown in FIG. 7 and FIG. 8 protrude vertically from the upper surface 147 of the base member 140, and are formed in a plate shape whose longitudinal direction is the protruding direction. As shown in FIG. 9, the through hole 136 of the cap member 120 into which the engaging protrusion 151 is inserted is formed in a substantially rectangular shape in plan view. The inner wall surface includes an inner inner wall surface 362 close to the inner space in which the level detection element 160 is accommodated, an outer inner wall surface 361 facing the inner inner wall surface 362 on the side far from the inner space, an inner inner wall surface 362, and The outer side wall surface 361 is connected to each other to be opposed to each other, and is configured by a front side wall surface 363 and a rear side wall surface 364, and the inner side inner wall surface 362 side is a long side. The engaging protrusion 139 that engages with the engaging protrusion 151 protrudes from the outer inner wall surface 361 of the through hole 136 toward the inner inner wall surface 362.

  As shown in FIG. 10, at the center in the horizontal direction of the outer inner wall surface 361 (see FIG. 9) of the through-hole 136 and above the vertical direction (on the side far from the upper surface 147 of the base body 141), A protrusion 137 of the protrusion 139 is provided. The protruding portion 137 includes a rib-like support piece 371 extending in the vertical direction, and claw portions 372 that bulge round on both sides in the horizontal direction at substantially the center in the vertical direction of the support piece 371. Further, two projections 138 of the engagement projection 139 are provided as a pair at both ends in the horizontal direction at substantially the center in the vertical direction of the outer inner wall surface 361, and the front side wall surface 363 or the rear side wall surface respectively. 364 is provided continuously. The protrusion 137 and the protrusion 138 correspond to the “second protrusion” and the “first protrusion” in the present invention, respectively.

  On the other hand, the plate-like engagement protrusion 151 is arranged on the upper surface 147 of the base member 140 such that the plate surface faces the outer inner wall surface 361 and the inner inner wall surface 362 when inserted into the through hole 136. It is installed. The engagement protrusion 151 has a distal end 512 in the projecting direction from the center position in the horizontal direction (short direction of the plate surface, ie, the plate width direction) toward the base end side in the vertical direction (projection direction). A narrow slit 517 is formed up to a predetermined distance (in this embodiment, at least up to a position straddling a formation position of a notch 515 described later). At a predetermined position on this slit 517 (in this embodiment, a position closer to the tip side than a formation position of a notch 515 described later), a notch 513 for engaging with the protrusion 137 has a width of the slit 517. It is recessed on each side of the direction. The notch 513 corresponds to the “second notch” in the present invention.

  In addition, the open portion of the slit 517 (the end portion connected to the tip of the engagement protrusion 151) is formed with a tapered surface 518 whose width widens toward the open side. Due to the slit 517, the distal end portion 511 of the engagement protrusion 151 is bifurcated. On the other hand, on the side surfaces 516 on both sides in the horizontal direction (plate width direction) of the engaging protrusion 151, a pair of notch portions 515 are provided at substantially the center in the protruding direction of the engaging protrusion 151. Recesses are formed in the plate width direction so as to engage with the portion 138. A portion of the side surface 516 closer to the tip than the notch 515 is formed as a tapered surface 519 having a shape that tapers toward the tip of the engaging protrusion 151. The notch 515 corresponds to the “first notch” in the present invention.

  By the way, as described above, the cap member 120 and the base member 140 are made of a resin containing glass fiber, but at least the engagement protrusion 151 has a glass fiber content in other parts of the surface layer portion 100 μm from the outer surface. Fewer skin layers are formed. In this skin layer, since the glass fiber content is low, the hardness is low compared to other parts.

  In the present embodiment, the engagement protrusions 151 and the engagement protrusions 139 are formed in the notches 513 and 515 and the through holes 136 of the engagement protrusions 151 so that the engagement protrusions 139 are firmly engaged. The positions and sizes of the projections 137 and 138 that constitute the engagement projection 139 are defined. In this embodiment, in the present embodiment, a reference point C0 serving as a reference for specifying the formation position of each part is determined as follows. As shown in FIG. 10, in a state where the engagement protrusion 151 is engaged with the engagement protrusion 139, it passes through the center of the engagement protrusion 151 in the horizontal direction (short direction of the plate surface), and the vertical direction (plate A vertical line LV parallel to the longitudinal direction of the surface is assumed. Further, in the edge on the base end side of the engagement protrusion 151 (that is, the contact position between the upper surface 147 of the base member 140 and the open end of the base end portion 121 of the cap member 120) ) Is assumed to be parallel to the horizontal line LH. The intersection of the vertical line LV and the horizontal line LH is defined as a reference point C0. The vertical line LH and the horizontal line LV correspond to the “first straight line” and the “second straight line” in the present invention, respectively.

  As shown in FIG. 11, the notch 515 of the engagement protrusion 151 is centered on a position that is separated from the reference point C0 by the distance L1 along the horizontal line LH and from the reference point C0 by the distance H1 along the vertical line LV. The shape is cut along a virtual circle Q1 having a radius R1 of C1. Similarly, the notch 513 of the engagement protrusion 151 has a shape notched along a virtual circle Q3 having a radius R3 with the center C3 at a position separated from the reference point C0 by the distance H3 along the vertical line LV. .

  On the other hand, as shown in FIG. 12, the protrusion 138 of the engagement protrusion 139 is located at a distance L2 from the reference point C0 along the horizontal line LH and at a distance H2 from the reference point C0 along the vertical line LV. And a portion including an outer shape along a virtual circle Q2 having a radius R2 with the center C2. Similarly, the protrusion 137 of the engagement protrusion 139 has a portion including an outer shape along a virtual circle Q4 having a radius R4 with a center C4 at a position separated from the reference point C0 by a distance H4 along the vertical line LV.

Then, it is defined that the following relations are satisfied with respect to the respective formation positions, shapes, and sizes between the notches 513 and 515 of the engagement protrusion 151 and the protrusions 137 and 138 of the engagement protrusion 139. ing.
H1 <H2 and H3 <H4 (1)
L1> L2 (2)
R1> R2 and R3> R4 (3)

  When the cap member 120 and the base member 140 are engaged with each other, the opening end of the cap member 120 and the upper surface 147 of the base member 140 are in contact with each other, so that both are positioned at the position of the horizontal line LH. Therefore, as shown in FIG. 13, when the engagement protrusion 151 and the engagement protrusion 139 are in a disengaged state, they are arranged so that the positional relationship between them is satisfied, and the contour of the both Overlapping lines. At this time, if the relationship of H1 <H2 is satisfied in the relational expression (1), the contour line of the notch 515 of the engagement protrusion 151 and the contour line of the protrusion 138 of the engagement protrusion 139 are: Crossing each other on the side away from the horizontal line LH along the vertical line LV (see the hatched portion in the left enlarged window shown in FIG. 13). Since the notch 515 is formed in the engagement protrusion 151 protruding from the base member 140, the positional relationship with the horizontal line LH is unchanged. Therefore, if the notch 515 and the protrusion 138 have the above relationship, the protrusion 138 is notched when the engagement protrusion 151 and the engagement protrusion 139 are actually engaged. A pressing force is applied to 515 in the direction approaching the horizontal line LH along the vertical line LV, that is, the cap member 120 is pressed so as to approach the base member 140.

  Similarly, by satisfying the relationship of H3 <H4, the outline of the notch 513 of the engagement protrusion 151 and the outline of the protrusion 137 of the engagement protrusion 139 are separated from the horizontal line LH along the vertical line LV. They cross each other on the far side (see the shaded area in the right side enlarged window shown in FIG. 13). Therefore, when the engagement protrusion 151 and the engagement protrusion 139 are engaged, the protrusion 137 also receives a pressing force from the notch 513 in the direction approaching the horizontal line LH along the vertical line LV, and the cap member 120 is It will be pressed so as to approach the member 140.

  If the relationship of L1> L2 is satisfied as in the relational expression (2), the outline of the notch 515 of the engagement protrusion 151 and the outline of the protrusion 138 of the engagement protrusion 139 Crosses in the direction approaching the vertical line LV along the horizontal line LH (see the hatched portion in the left enlarged window shown in FIG. 13). If the notch 515 and the protrusion 138 have such a relationship, when the engagement protrusion 151 and the engagement protrusion 139 are actually engaged, the two notches 515 correspond to each other. Each of the protrusions 138 is pressed in a direction approaching the vertical line LV along the horizontal line LH.

  And, if the relations R1> R2 and R3> R4 are satisfied as in the relational expression (3), the projections 137 and 138 having convex shapes that engage with each other rather than the size of the concave notches 513 and 515, respectively. The size can be reduced. That is, the protrusions 137 and 138 are likely to be accommodated in the notches 513 and 515 when both are engaged.

  In the present invention, the notches 513 and 515 of the engagement protrusion 151 and the protrusions 137 and 138 of the engagement protrusion 139 are engaged with each other. In addition, each formation position satisfies the relationship described in this embodiment mode. That is, when the cap member 120 and the base member 140 are arranged at the mutual alignment position, the positional relationship in which the projections 137 and 138 of the engagement projection 139 come into contact with the notches 513 and 515 of the engagement projection 151, respectively. And is in a size relationship. Therefore, when the cap member 120 and the base member 140 are disposed at the mutual alignment position, the protrusions 137 and 138 of the engagement protrusion 139 are engaged protrusion pieces while satisfying the correlation of the arrangement positions in the present invention. What does not contact the notch portions 513 and 515 of 151 is not included in the claims of the present invention.

  A method for detecting the state of the oil OL by attaching the liquid level sensor 100 having such a structure to the bottom OP of the oil pan will be briefly described. As shown in FIG. 4, the liquid level sensor 100 of the present embodiment is fixed to the bottom OP of the oil pan, and the extending direction of the detection electrodes 173 and 174 of the level detection element 160 coincides with the vertical direction V. That is, a portion that is immersed in the oil OL and a portion that is not immersed are generated between the detection electrodes 173 and 174 according to the change in the liquid level of the oil OL.

  By the way, when an AC voltage is applied between the detection electrodes 173 and 174, lines of electric force are generated between them. The capacitance of the capacitor formed between the detection electrodes 173 and 174 varies depending on the dielectric constant of the space through which the generated lines of electric force pass. Here, since the dielectric constant of air and the dielectric constant of the liquid (oil OL in the present embodiment) are different, the capacitance of the capacitor formed between the detection electrodes 173 and 174 is immersed in the oil OL. It is obtained as a combined capacity of the electrostatic capacity of the capacitor formed in the exposed part and the electrostatic capacity of the capacitor formed in the part exposed to air. That is, the capacitance between the detection electrodes 173 and 174 changes according to the ratio of the portion immersed in the oil OL and the portion exposed to air between the detection electrodes 173 and 174. In the liquid level sensor 100 of the present embodiment, the correlation between the capacitance between the detection electrodes 173 and 174 and the liquid level of the oil OL is obtained in advance, and the liquid level of the oil OL is detected based on this correlation. Done.

  Note that the characteristics of the oil OL may change due to aging, heat, or the like, or the dielectric constant may be changed by mixing different types of oils OL. In such a case, the level detection element 160 is provided with reference electrodes 171 and 172 so that accurate liquid level measurement can be performed. The reference electrodes 171 and 172 are always arranged so that the whole is immersed in the oil OL. Then, the dielectric constant of the oil OL is obtained from the capacitance of the capacitor formed between the reference electrodes 171 and 172, and the capacitance between the detection electrodes 173 and 174 is corrected based on the obtained dielectric constant. The liquid level sensor 100 accurately detects the level of the oil OL.

  As described above, when detecting the state of the oil OL, the cap member 120 is used so as to protrude entirely into the oil pan. In the liquid level sensor 100 of the present embodiment, the above-described engagement structure realizes a structure in which the cap member 120 is not detached from the base member 140 in the oil pan. Hereinafter, fixing of the cap member 120 and the base member 140 will be described.

  In the assembly of the liquid level sensor 100 having the engagement structure as described above, the engagement between the engagement protrusion 139 and the engagement protrusion 151 (more specifically, the protrusion of the engagement protrusion 139 shown in FIG. 8). The engagement between the portions 137 and 138 and the cutout portions 513 and 515 of the engagement protrusion 151 is performed as follows. First, the engagement protrusion 151 is inserted into the through hole 136 from the base end 121 side of the cap member 120. In the through hole 136, the engaging protrusion 151 is positioned by the inner wall surface of the through hole 136 (outer inner wall surface 361, inner inner wall surface 362, front side wall surface 363 and rear side wall surface 364). The portion 137 is guided between the bifurcated tip portions 511 of the engaging protrusion 151. Then, as the insertion of the engagement protrusion 151 proceeds, as shown in FIG. 10, the claw portion 372 of the projection 137 abuts against the tapered surface 518 and guides into the slit 517 while expanding between the two end portions 511. Is done. The rigidity of the engagement protrusion 151 is reduced by the slit 517, and the distal end portion 511 side is easily bent. Therefore, the protrusion 137 is easily guided to the notch 513 in the slit 517. At this time, since the shape of the projecting portion 137 and the shape of the notched portion 513 satisfy the relationship of the relational expression (3) described above, the projecting portion 137 is easily accommodated in the notched portion 513, and the catch becomes good. It becomes difficult to come off.

  On the other hand, the protruding portion 138 contacts the tapered surfaces 519 on both side edges of the engaging protruding piece 151, and is guided and engaged with the notched portion 515 while pushing and narrowing the tip portion 511 that is easily bent by the slit 517. Similarly to the above, since the shape of the protruding portion 138 and the shape of the notched portion 515 satisfy the relationship of the relational expression (3) described above, the protruding portion 138 is easily accommodated in the notched portion 515 and the catching is improved. It becomes difficult to come off.

  In addition, since the notches 515 and 513 and the protrusions 138 and 137 satisfy the relational expression (1) described above, the notches 513 and 515 of the engagement protrusion 151 whose position with respect to the horizontal line LH does not change are used as the engagement protrusions. The protruding portions 137 and 138 of the portion 139 are pressed toward the horizontal line LH along the vertical line LV. That is, the cap member 120 provided with the engagement protrusion 139 is pressed toward the base member 140 provided with the engagement protrusion 151, and the engagement between the two can be firmly maintained.

  By the way, as described above, a skin layer is formed at least on the surface layer portion of the engagement protrusion 151. Since the hardness of the resin decreases as the glass fiber content decreases, the skin layer of the engagement protrusion 151 is deformed in accordance with the unevenness of the surface of the engagement protrusion 139, and the adhesion between the surfaces increases. Slip is prevented. As a result, the engagement between the base member 140 provided with the engagement protrusion 151 and the cap member 120 provided with the engagement protrusion 139 can be firmly maintained.

  Further, since the notch 515 and the protrusion 138 satisfy the relational expression (2), the two notches 515 are pressed by the protrusion 138 toward the vertical line LV. As a result, the tip 511 of the engaging protrusion 151 that is bifurcated by the slit 517 is pressed in the direction of narrowing the width of the slit 517, so that the protrusion 137 is sandwiched by the notch 513 in the slit 517. It will be.

  Then, when an external force is applied in a direction in which the engagement protrusion 151 and the engagement protrusion 139 are engaged, the protrusion 138 has a tapered surface 519 and a notch as shown in FIG. In order to get over the boundary portion with the portion 515, a pressing force is applied to the bifurcated tip portion 511 of the engagement protrusion 151 in a direction in which the tip portions 511 are closer to each other. On the other hand, similarly, since the protruding portion 137 tries to get over the boundary portion between the tapered surface 518 and the notch portion 513, the leading end portions 511 are away from each other with respect to the bifurcated leading end portion 511 of the engaging protruding piece 151. Apply pressing force. That is, the engagement of the protrusion 138 and the notch 515 and the engagement of the protrusion 137 and the notch 513 regulate the release of the engaged state of each other. For this reason, the engagement between the base member 140 provided with the engagement protrusion 151 and the cap member 120 provided with the engagement protrusion 139 can be firmly maintained.

  Needless to say, the present invention can be modified in various ways. For example, the engagement structure including the engagement protrusion 139 and the engagement protrusion 151 is provided at two locations so as to be symmetric with respect to the internal space of the cap member 120, but may be provided at three or more locations.

  Further, in the present embodiment, an engagement structure including an engagement protrusion 151 and an engagement protrusion 139 is used to engage the two members of the cap member 120 and the base member 140 constituting the housing 110. A level detection element 160 as an electronic component was accommodated inside. The electronic component does not necessarily have to be accommodated in the internal space formed by the two members. The electronic component is accommodated in one member and the one member and the other member are engaged in this state. A case may be configured. As a specific example, a sensor control device 400 shown in FIG. 14 can be cited. This sensor control device 400 is electrically connected to a gas sensor (not shown) and an ECU (electronic control unit) provided in an automobile via connectors 480 and 490, respectively, and a detection signal input from the gas sensor indicates a gas concentration. It is a device that converts it into a concentration signal and outputs it to the ECU.

  As shown in FIG. 15, the housing 410 of the sensor control device 400 includes a resin-made housing case 440 that houses a circuit board (not shown) on which the above-described signal conversion circuit and the like are formed, and an outer surface of the housing case 440. It comprises a metal protective cover 420 that covers and protects. Since this sensor control device 400 is used by being fixed at a mounting position such as under the floor of a vehicle by a bracket 401 provided on the protective cover 420, one side of the rectangular parallelepiped is opened so that the circuit board can be protected from a severe use environment. A circuit board is placed in a housing case 440 having a box shape and made of resin, and sealed with a resin filler to ensure airtightness and watertightness. And the protective cover 420 which covers the outer surface of the storage case 440 is assembled so that the storage case 440 can be protected from an impact caused by a collision with a stepping stone or the like. The engagement structure including the engagement protrusion and the engagement protrusion of the present invention is optimal for preventing the protective cover 420 from dropping off due to vibration or impact.

  Specifically, the side wall of the protective cover 420 is cut away so that the engagement protrusion 451 having the same shape as the engagement protrusion 151 of the present embodiment has a bifurcated tip 411 facing the open end. It forms so that it may become. On the other hand, at the position of the side surface of the housing case 440 where the engaging protrusion 451 is disposed when the protective cover 420 is put on the housing case 440, the engaging protrusion of the same form as the engaging protrusion 139 of the present embodiment. 439 is projected. The protective cover 420 is formed with two engaging protrusions 451 on two opposing side walls. Similarly, the housing case 440 is also provided with two engaging protrusions 139 on two opposing side surfaces. Form. The engagement structure between each engagement protrusion 451 and each corresponding engagement protrusion 439 is the same as in the present embodiment, and the description thereof is omitted here, but the sensor control device 400 uses this engagement structure. By having the protective cover 420, the protective cover 420 can be prevented from dropping off from the housing case 440 even when used in a severe environment such as being fixed under the floor of a vehicle.

  In this embodiment, the engaging protrusion 151 is inserted into the through hole 136 and engaged with the engaging protrusion 139 in the through hole 136. However, the engaging protrusion 139 is not necessarily in the through hole 136. The engaging protrusion 451 and the engaging protrusion 439 may be exposed outward as in the sensor control device 400 described with reference to FIG. 15, for example. Alternatively, when an engagement protrusion is provided on the inner surface side of the side wall of the protective cover 420, an engagement protrusion may be provided on the side wall of the housing case 440. It is also possible to adopt a configuration in which is not exposed to the outside.

  The flow hole 127 is provided on the cap member 120 side so that liquid (oil OL) can flow into and out of the internal space formed by the cap member 120 and the base member 140. However, the flow hole 127 is provided on the base member 140 side. It is sufficient that the liquid can be circulated in the internal space. Further, in the present embodiment, the circulation hole 127 is provided in a cutout shape penetrating in the thickness direction at the opening end of the cap member 120, but may be formed in a hole shape on the side surface of the base end portion 121.

  The present invention can be applied to cases that can accommodate electronic components.

It is the perspective view which looked at the liquid level sensor 100 from the front, the right side, and the plane. 4 is a right side view of the liquid level sensor 100. FIG. 2 is a plan view of a liquid level sensor 100. FIG. It is sectional drawing which looked at the liquid level sensor 100 of the state attached to the bottom part OP of the oil pan of a motor vehicle from the arrow direction in the dashed-dotted line AA of FIG. It is a top view of the level detection element 160 which consists of a film electrode board | substrate. It is the perspective view which looked at the supporting member 200 which supported the level detection element 160 from the front, the left side, and the plane. FIG. 3 is a perspective view of the liquid level sensor 100 showing a state in the middle of assembling the cap member 120 to the base member 140 as seen from the front, right side, and plane. 4 is a right side view of the liquid level sensor 100 showing a state in the middle of assembling the cap member 120 to the base member 140. FIG. In the top view of the liquid level sensor 100 shown in FIG. 3, it is the figure which expanded the vicinity of the through-hole 136 formed in the right side bulging part 133, and is a figure which shows the state which the engagement protrusion 151 does not engage. . FIG. 4 is a cross-sectional view showing a state in which protrusions 137 and 138 of a through hole 136 and notches 513 and 515 of an engagement protrusion 151 are engaged when viewed from the direction of the arrows along the one-dot chain line BB shown in FIG. 3. . In order to describe the outer shape of the engaging protrusion 151, the outline of the engaging protrusion 151 viewed from the direction of the arrow in the alternate long and short dash line BB shown in FIG. 3 is not engaged with the engaging protrusion 139. It is a figure shown in a state. In order to describe the outer shape of the engaging protrusion 139, the outline of the engaging protrusion 139 viewed from the direction of the arrow in the alternate long and short dash line BB shown in FIG. 3 is not engaged with the engaging protrusion 151. It is a figure shown in a state. In order to explain the positional relationship between the notches 513 and 515 of the engagement protrusion 151 and the protrusions 137 and 138 of the engagement protrusion 139, the outline of the engagement protrusion 151 in FIG. It is the figure which displayed the outline of the part 139 in piles It is a perspective view which shows the external appearance of the sensor control apparatus 400 which has the housing 410 as a modification of an electronic component storage case. 6 is an exploded perspective view showing a state before the protective cover 420 and the housing case 440 of the sensor control device 400 are assembled. FIG.

Explanation of symbols

110 Housing 120 Cap member 127 Flow holes 137, 138 Protrusion 139 Engagement protrusion 140 Base member 151 Engagement protrusion 160 Level detection element 513, 515 Notch 517 Slit

Claims (4)

Of the two members, at least one of which is made of resin, the engagement protrusions extending in the shape of a plate provided on one of the first members are engaged with the engagement protrusions provided on the other second member, thereby the first member. An electronic component housing case for housing an electronic component in the case, or in the interior of either the first member or the second member,
The engaging protrusion of the first member is formed in a plate shape having a protruding direction from the first member as a longitudinal direction,
A first cutout portion in which both side ends on the longitudinal side of the engagement protrusion are cut out in an arc shape inward at predetermined positions;
A slit cut out to a predetermined distance from the center position in the short-side direction at the distal end of the engagement protrusion toward the proximal end side of the engagement protrusion;
A second notch portion in which the slit is cut out in an arc shape in the width direction at a predetermined position on the slit;
The engaging protrusions of the second member protrude from the surface of the second member, and are arranged in a one-to-one relationship inside the first notches, and are engaged with the first notches. A first projecting portion,
A second protrusion that protrudes from the surface of the second member and that is disposed inside the second notch and engages with the second notch.
In a state where the engagement protrusion and the engagement protrusion are engaged with each other, when both are viewed from one plate surface side of the engagement protrusion, When the intersection between the first straight line passing through the center and parallel to the longitudinal direction and the second straight line parallel to the short direction of the engaging protrusion at the base end side edge of the engaging protrusion is used as a reference point In
The first cutout portion is along a virtual circle having a radius R1 centered at a distance L1 from the reference point along the second straight line and a distance H1 from the reference point along the first straight line. It has a cut-out shape,
The second cutout portion is cut out along an imaginary circle having a radius R3 centered on a position separated by a distance H3 along the first straight line from the reference point toward the distal end side of the engagement protrusion. No shape,
The first protrusion has an outer shape along a virtual circle having a radius R2 centered at a distance L2 from the reference point along the second straight line and a distance H2 from the reference point along the first straight line. Including the part that made
The second protrusion includes a portion having an outer shape along an imaginary circle having a radius R4 centered on a position separated by a distance H4 along the first straight line from the reference point to a distal end side of the engagement protrusion. Is,
H1 <H2 and H3 <H4
An electronic component housing case characterized by satisfying the above relationship. In a state where the engagement protrusion and the engagement protrusion are engaged with each other,
L1> L2
The electronic component housing case according to claim 1, wherein: In a state where the engagement protrusion and the engagement protrusion are engaged with each other,
R1> R2 and R3> R4
The electronic component housing case according to claim 1, wherein the electronic component housing case is satisfied. The electronic component includes a detection element that detects a liquid state, and one of the first member and the second member is formed with a flow hole through which liquid flows between the inside and the outside of the electronic component housing case. The electronic component housing case according to any one of claims 1 to 3,

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