JP2003035563A - Rotation type sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation type sensor having a rotating body with a little fluctuation and good performance. SOLUTION: The rotating body 8 of the rotation type sensor has a housing section 8c at a rigid wall section 8b in which an elastic forcing member 13 and a restricting member 12 composed of a rigid projective section are disposed. A drive shaft 14 is pressed by the forcing member 13 so that the drive shaft 14 is in pressing contact with the restricting member 12, and the drive shaft 14 is sandwiched and held by the restricting member 12 and the forcing member 13. Thereby, the rotation type sensor, in which the drive shaft 14 is surely held and stable in comparison with conventional methods, and the rotating body 8 has a little fluctuation for the vibration and the impact, can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type sensor used for a throttle sensor of an automobile and capable of detecting a rotation angle transmitted from the outside.

[0002]

2. Description of the Related Art The structure of a conventional rotary sensor will be described with reference to FIG. 7. A housing 30 formed of a synthetic resin molding or the like and having a box-shaped outer shape has a bottom wall 31 and a bottom wall 31. It has a side wall 33 extending rearward from the side wall in a cylindrical shape, a bottom plate 34 closing one end of the side wall 33, and a storage portion 32 surrounded by the side wall 33 and the bottom plate 34.

Further, at the central portion of the bottom plate 34, the storage portion 32 is provided.
A support portion 34a that protrudes to the front, which is the side, is formed, and a receiving portion 34b that is a hemispherical recess is provided at the center of the support portion 34a. In addition, the side wall 33 of the bottom plate 34
A holding portion 34c formed of a convex portion is formed on the side.

The plate-shaped insulating substrate 37 has a hole 37a at the center thereof.
Although not shown here, a current collector pattern composed of a resistor pattern and a good conductor is provided on one surface of the insulating substrate 37. The insulating substrate 37 has a hole 37a.
It is mounted on the bottom plate 34 in a state where the supporting portion 34a is inserted into the housing, the outer peripheral portion is supported by the holding portion 34c, and is attached to the housing 30.

A plate-shaped upper plate 4 made of a synthetic resin molding or the like
No. 0 has a hole 40a in the center, and this upper plate 40 is placed on the bottom wall 31 so as to cover the storage portion 32, and the mounting projection 31a provided on the bottom wall 31 is caulked by heat. And is attached to the bottom wall 31.

The rotating body 35 made of a synthetic resin molding is
A disk-shaped portion 35a, a pair of arm portions 35b having a flexible spring property, which protrude from the central portion of the disk-shaped portion 35a to face each other forward, and which are flexible, are provided on the free end side of the pair of arm portions 35b. It has a convex portion 35c which is provided so as to face each other and has a rounded tip, and a protrusion 35d which extends downward from the central portion of the lower surface of the disc-shaped portion 35a and has a semi-spherical convex portion at the tip.

The rotating body 35 is housed in the housing 32 and rotatably held in the state where the projection 35d contacts the receiving portion 34b and the arm 35b projects upward from the hole 40a. At the same time, the rotating body 35 is pivotally supported by the protrusion 35d and can be tilted.

The spring member 42 is formed of a ring-shaped spring plate, and the spring member 42 has a disk-shaped portion 35a and an upper plate 40.
It is arranged between and to constantly press the rotating body 35 toward the bottom plate 34. The slider 36 is formed of a conductive spring plate. The slider 36 is attached to the lower surface of the disk-shaped portion 35a and can slide on the resistor pattern and the current collector pattern. . The resistor pattern, the current collector pattern, and the slider 36 constitute detection means K2 for detecting the rotation angle.

A drive shaft 43 associated with a throttle valve of an automobile or the like has a flat plate-like projection 43a passing through a center line A which is a rotation center at a tip end thereof, and the drive shaft 43 has a predetermined rotation angle. It is designed to reciprocate within a range. Further, the protrusion 43a of the drive shaft 43 is in contact with the protrusion 35c of the rotating body 35, and the pair of arm portions 35 having spring properties.
It is sandwiched between b.

When the drive shaft 43 rotates, the rotating body 35 rotates while being sandwiched by the pair of arm portions 35b, and as a result, the slider 36 is placed on the resistor pattern and the current collector pattern. By sliding, the detecting means K2 is operated and the rotation angle is detected. Further, when the drive shaft 43 is in the state of being displaced from the center, the rotating body 35 is tilted at the position where it is pivotally supported and follows the displacement of the drive shaft 43.

[0011]

In the conventional rotary sensor, the drive shaft 43 is composed of a pair of arms 35b, both of which have spring properties.
Because it holds the pair of arms, vibration and impact are
There is a problem that the fluctuation of the rotating body 35 is increased due to the influence on 5b. Further, when the drive shaft 43 suddenly rotates, the pair of arms 35b are opened, the rotation transmission is delayed in the rotating body 35, and the circular motion of the rotating body 35 is not constant, resulting in poor performance. . Also, the left and right arms 35
If b has a difference in elastic force, there is a problem that the drive shaft 43 is displaced from the rotating body 35 and the tilt angle of the rotating body 35 becomes larger than necessary.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rotary sensor which has less fluctuation of the rotating body and has good performance.

[0013]

As a first solving means for solving the above-mentioned problems, a casing, a rotatable rotating body which is pivotally supported in the casing, and a rotating body which is operated by rotation of the rotating body. Detecting means, and a drive shaft for rotating the rotating body, the rotating body has a rigid wall portion, and a storage portion formed of a recess provided in the wall portion, in the storage portion, A regulation member including a rigid convex portion and a biasing member having a spring property are provided, and when the drive shaft is inserted into the housing portion, the drive shaft is pressed against the regulation member. Is pressed by the biasing member so that the drive shaft is sandwiched between the restricting member and the biasing member.

Further, as a second solving means, the convex portion forming the regulating member is formed in a direction orthogonal to the axial direction of the drive shaft. Further, as a third solving means, the convex portion forming the restricting member is formed so as to be integrally formed with the wall portion by protruding from the wall portion of the rotating body toward the storage portion.

As a fourth solving means, the regulating member is composed of a plate-shaped portion and the convex portion projecting from the plate-shaped portion, and the regulating member is housed in the housing portion. did. Further, as a fifth solving means, a U-shaped metal plate having a spring property having first and second arm portions opposed to each other is provided, and the first arm portion is provided with the regulation portion including the convex portion. A member is provided, the biasing member is configured by the second arm portion, and the metal plate is stored in the storage portion.

As a sixth means for solving the problems,
A locking portion is provided on at least one of the second arm portions, and an engaging portion that engages with the locking portion is provided on the wall portion, and the metal plate is stored in the storage portion. At this time, the locking portion and the engaging portion are engaged with each other to prevent the metal plate from coming off the storage portion.

As a seventh means for solving the problems, a pair of the convex portions constituting the regulating member are provided on the first arm portion at intervals, and the locking portion is provided between the pair of convex portions. The configuration is provided. Further, as an eighth solution means, a bent portion having a hole is provided on the free end side of the second arm portion,
A protrusion provided at one end of the wall portion is inserted into the hole, and the protrusion engages with one end of the hole to increase the pressing force of the biasing member against the drive shaft. It was configured.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings of the rotary type sensor of the present invention, FIG. 1 is a front view of the rotary type sensor of the present invention, and FIG.
1 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a front view of a metal plate relating to the rotary sensor of the present invention, FIG. 4 is a sectional view taken along line 4-4 of FIG. 3, and FIG. FIG. 6 is a top view of a metal plate related to the mold sensor, and FIG. 6 is a perspective view of the metal plate related to the rotary sensor of the present invention.

Next, the structure of the rotary sensor of the present invention is shown in FIG.
Describing with reference to FIGS. 6A to 6C, the housing 1 is composed of a case 2 made of a synthetic resin molded product, and a lid 3 that closes the rear opening of the case 2.

The case 2 has a cylindrical side wall 2b having a storage portion 2a therein and a storage portion 2a from the side wall 2b.
A receiving portion 2c formed of a two-step cylindrical portion protruding inward, a two-step shoulder portion 2d provided on the rear opening side of the side wall 2b, and a cylindrical portion formed by extending from the side wall 2b at a right angle. 2e and.

The lid 3 has a plate-like shape and has a plate-like portion 3a.
And a collar portion 3b provided on the outer peripheral portion of the plate-shaped portion 3a,
It has a holding portion 3d that protrudes forward from the plate-shaped portion 3a and has a recessed portion 3c in the center. And this lid 3 is
The case 2 is mounted on the shoulder 2d from the rear side of the opening, and the rear side of the side wall 2b of the case 2 is thermally caulked or the like to be attached to the case 2 so as to close the opening.

A plurality of terminals 4 made of a metal material are used for a connector. The terminals 4 are embedded in the case 2 and attached, one end of which projects into the housing 2a of the case 2 and the other end It is in a state of protruding into the cylindrical portion 2e. The supporting portion 5 made of a metal material or the like has a cylindrical portion 5a and a conical portion 5b provided in front of the cylindrical portion 5a. The supporting portion 5 inserts the cylindrical portion 5a into the recess 3c. Then, it is held by the holding portion 3d.

The plate-shaped insulating substrate 6 has a hole 6a in the center portion thereof, and although not shown here, a current collector pattern including a resistor pattern and a good conductor is provided on one surface of the insulating substrate 6. The resistor pattern and the current collector pattern are electrically connected to the plurality of terminal portions 7 attached to the insulating substrate 6. Further, the insulating substrate 6 has an outer peripheral portion placed on the shoulder portion 2d, and the hole 6a has the support portion 5a.
The insulating substrate 6 is housed in the housing portion 2 a in a state of facing the
The outer peripheral portion is pressed against the shoulder portion 2d to be attached to the case 2, and the terminal portion 7 is soldered to the connector terminal 4 protruding into the housing portion 2a.

The rotating body 8 made of a synthetic resin molding has a disk-shaped portion 8a, a cylindrical rigid wall portion 8b protruding forward from the central portion of the disk-shaped portion 8a, and the cylindrical shape. Wall 8
A housing portion 8c formed of a concave portion provided in the central portion of b and an engagement portion 8 formed of a concave portion provided near one end of the wall portion 8b.
d, a projection 8e provided on one end surface of the wall portion 8b, a projection 8f projecting rearward from the central portion of the disk-shaped portion 8a, and a conical shape provided at the rear end of the projection 8f. It has a concave portion 8g.

That is, the wall portion 8b is formed in a rigid state without bending and having a hard property. Further, although the wall portion 8b has been described as a rigid tubular shape, for example, it may be formed by a pair of rigid wall portions facing each other.

The rotating body 8 is housed in the housing portion 2a of the case 2, the cylindrical wall portion 8b is inserted into the receiving portion 2c, and the protrusion 8f is inserted into the hole 6a of the insulating substrate 6. The conical portion 5b is inserted into the concave portion 8g, and the rotating body 8
Is rotatably held and pivotally supported by the protrusion 8f so that it can be tilted. The rotating body 8 is constantly pressed toward the supporting portion 5 side by a ring-shaped spring member 9 arranged between the disc-shaped portion 8a and the receiving portion 2c.

The slider 10 is formed of a conductive spring plate. The slider 10 is attached to the lower surface of the disk-shaped portion 8a and can slide on the resistor pattern and the current collector pattern. Has become. The resistor pattern, the current collector pattern, and the slider 10 constitute a detecting unit K1 including a rotary variable resistor that detects a rotation angle. The detecting means K1 may be composed of a rotary encoder other than the rotary variable resistor.

As shown in FIGS. 3 to 6, the metal plate 11 made of a material having a spring property is formed in a U shape and has first and second arm portions 11a and 11b facing each other, and the first and second arm portions 11a and 11b. 1, a connecting portion 11c that connects the second arm portions 11a and 11b,
It has a slit 11d provided across the first and second arm portions 11a and 11b and the connecting portion 11c.

Further, the first arm portion 11a of the metal plate 11 is provided near the upper end of the first arm portion 11a at a distance from each other, and includes a pair of rigid convex portions having rounded tips.
2, a locking portion 11e formed by a cut-and-raised piece provided between the pair of regulating members 12, and a bent portion 11f bent outward from the free end of the first arm portion 11a.

The middle portion of the second arm portion 11b is bent toward the first arm portion 11a so that the tip end is rounded,
The second arm portion 11b constitutes the biasing member 13 having a spring property, and the second arm portion 11b has a bent portion 11g bent outward from the free end side and a bent portion 11g. It has the hole 11h provided.

The metal plate 11 is inserted into the accommodating portion 8c of the rotating body 8 from the side of the connecting portion 11c, and the first and second arm portions 11a and 11b contact the inner wall surface of the accommodating portion 8c. It is stored while. If the locking portion 11e coincides with the engaging portion 8d of the wall portion 8b during this insertion, the locking portion 11e engages with the engaging portion 8d to prevent the metal plate 11 from coming off the storage portion 8c. Be seen. Further, the hole 1 is formed in the protrusion 8e.
It is attached so that the outer end surface formed in an arc shape of 1 h abuts, and a predetermined gap is formed between the regulation member 12 and the biasing member 13.

When the metal plate 11 is attached to the wall portion 8b, as shown in FIG. 2, the rigid convex portion constituting the regulating member 12 projects into the storage portion 8c, and the bent portion 11f is The free end side of the second arm portion 11b, which is located on the end face of the wall portion 8b and constitutes the biasing member 13, is in a state of a position T indicated by a two-dot chain line near the center portion of the storage portion 2a. There is.

The drive shaft 14 associated with a throttle valve of an automobile or the like has a flat plate-shaped projection 14a passing through the center line A which is the center of rotation at its tip, and the drive shaft 14 has a predetermined rotation angle. It is designed to reciprocate within a range. Then, the drive shaft 14 is inserted into the storage portion 8c of the wall portion 8b in a state where the protrusion 14a is located between the restriction member 12 and the biasing member 13.

Then, one surface of the protrusion 14a is restricted to the regulating member 12
The other surface of the protrusion 14a moves the second arm portion 11b (biasing member 13) outward against the spring property of the biasing member 13 in the state of being in contact with the top portion of the. Then, while the biasing member 13 is moving, one end of the inner side facing the arc-shaped portion of the hole 11h hits the protrusion 8e, and in this hit state,
When the biasing member 13 is pushed by the protrusion 14a, the biasing member 13
The repulsive force of is increased, and the pressing force of the protrusion 14a against the regulating member 12 is increased.

In this way, the drive shaft 14 is held between the regulating member 12 and the biasing member 13. Then, when the drive shaft 14 is clamped, the portion of the first arm portion 11a around the regulating member 12 is in pressure contact with the wall portion 8b, and the regulating member 12 is rigid so that it does not deform, and The convex portion that is the regulating member 12 is in a state of being formed in a direction orthogonal to the axial direction that is the center line A of the drive shaft 14, so that even if the drive shaft 14 has a center deviation, the regulating member 12 is formed. Is in line contact with the drive shaft 14, the rotating body 8
Can tilt.

In the rotary sensor having such a structure, when the drive shaft 14 rotates, the regulating member 12
The rotating body 8 rotates while being sandwiched between the urging member 13 and
As a result, the slider 10 slides on the resistor pattern and the current collector pattern, the detection means K1 is operated, and the rotation angle is detected. Further, when the drive shaft 14 is in the center misaligned state, the rotating body 8 tilts at the position where it is pivotally supported and follows the misalignment of the drive shaft 14.

In the above embodiment, the regulating member 1
2 and the biasing member 13 are described as being provided on one U-shaped metal plate 11, but the restricting member 12 and the biasing member 13 are described.
And may be formed of different materials. Further, the protrusion forming the regulating member 12 may be formed integrally with the wall portion 8b by protruding from the wall portion 8b of the rotating body 8 toward the storage portion 8c. Further, when the driving body 14 is inserted into the storage portion 8c, one end of the inner side of the stone member 13 facing the arcuate portion of the hole 11h hits the protrusion 8e.
It is also possible to make h large so as not to hit the projection 8e.

[0038]

According to the rotary sensor of the present invention, in the housing portion 8c provided in the rigid wall portion 8b of the rotating body 8, the regulating member 12 made of the rigid convex portion and the biasing member having the spring property are provided. 13 is provided, the drive shaft 14 is pressed by the biasing member 13 so that the drive shaft 14 is pressed against the regulation member 12, and the drive shaft 14 is sandwiched between the regulation member 12 and the biasing member 13. Therefore, as compared with the related art, it is possible to provide a rotary sensor in which the drive shaft 14 is held more reliably and more stably, and the fluctuation of the rotating body 8 is smaller against vibration and shock. Further, even if the drive shaft 14 rapidly rotates, the rotating member 8 rotates without causing a rotation delay and the circular motion of the rotating member 8 becomes constant due to the existence of the restricting member 12 including the rigid convex portion. A rotary sensor with good performance can be provided. Also,
It is possible to provide a rotary sensor in which the amount of tilt of the rotating body 8 is small.

Further, since the convex portion forming the regulating member 12 is formed in the direction orthogonal to the axial direction of the drive shaft 14, when the drive shaft 14 is in the center misaligned state, the rotating body 8 is lined with the drive shaft 14. In the contact state, the rotating body 8 can easily tilt to follow the deviation of the drive shaft 14 with the pivotally supported portion as a fulcrum, and the rotating force of the drive shaft 14 can be applied to the rotating body 8. It can be transmitted reliably.

Further, since the convex portion constituting the regulating member 12 protrudes from the wall portion 8b of the rotating body 8 toward the storage portion 8c and is formed integrally with the wall portion 8b, the constitution is simple and the productivity is good. You can get something.

Further, the regulating member 12 is composed of a plate-shaped portion and a convex portion protruding from this plate-shaped portion, and since the regulating member 12 is housed in the housing portion 8c, the regulating member 12 is housed in the housing portion 8c.
It can be stored in c, and it is easy to assemble and inexpensive.

Further, the first and second arm portions 1 facing each other
The regulating member 1 is provided with a U-shaped metal plate 11 having a spring property having 1a and 11b, and a convex portion on the first arm portion 11a.
2 is provided, and the biasing member 1 is provided by the second arm portion 11b.
3 is configured and the metal plate 11 is housed in the housing portion 8c, the metal plate 11 may be housed in the housing portion 8c, and the assembling property is good and the cost is low. In addition, the regulation member 1
Since 2 and the urging member 13 are formed by one metal plate 11, the manufacture thereof is simple and an inexpensive one can be obtained.

A locking portion 11e is provided on at least one of the first and second arm portions 11a and 11b, and the wall portion 8b has an engaging portion 8d that engages with the locking portion 11e.
Is provided, and when the metal plate 11 is stored in the storage portion 8c,
Since the locking portion 11e and the engagement portion 8d are engaged with each other to prevent the metal plate 11 from coming off from the storage portion 8c, the metal plate 11 can be easily attached, and a reliable one can be obtained. To be

Further, since a pair of convex portions forming the regulating member 12 are provided on the first arm portion 11a with a space therebetween, stable support of the drive shaft 14 on the regulating member 12 can be obtained. . Further, since the locking portion 11e is provided between the pair of convex portions, the position of the locking portion 11e becomes the central portion, and the metal plate 11 can be attached in a stable state.

On the free end side of the second arm portion 11b,
It has a bent portion 11g having a hole 11h, and a protrusion 8e provided at one end of the wall portion 8b is inserted into the hole 11h and
Since the protrusion 8e engages with one end of the hole 11h to increase the pressing force of the biasing member 13 against the drive shaft 14, the holding of the drive shaft 14 by the restricting member 12 and the biasing member 13 is strengthened. Therefore, the followability of the rotating body 8 from the drive shaft 14 can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a rotary sensor of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a front view of a metal plate according to the rotary sensor of the present invention.

4 is a sectional view taken along line 4-4 of FIG.

FIG. 5 is a top view of a metal plate according to the rotary sensor of the present invention.

FIG. 6 is a perspective view of a metal plate according to the rotary sensor of the present invention.

FIG. 7 is a sectional view of a main part of a conventional rotary sensor.

[Explanation of symbols] 1 housing 2 cases 2a storage 2b Side wall 2c receiver 2d shoulder 2e Cylindrical part 3 lid 3a plate-shaped part 3b collar part 3c recess 3d holding part 4 terminals 5 Support 5a cylindrical part 5b cone 6 insulating substrate 6a hole 7 terminals 8 rotating bodies 8a disk-shaped part 8b wall 8c storage 8d engaging part 8e protrusion 8f protrusion 8g recess 9 Spring member 10 Slider 11 metal plate 11a First arm 11b Second arm 11c connection part 11d slit 11e Locking part 11f Bending part 11g bending part 11h hole 12 Control member 13 Biasing member 14 Drive shaft 14a protrusion A center line T position K1 detection means

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Claims (8)

[Claims] 1. A rotating body comprising: a housing; a rotatable rotating body that is pivotally supported in the housing; detection means that is operated by rotation of the rotating body; and a drive shaft that rotates the rotating body. The body has a rigid wall portion and an accommodating portion formed of a concave portion provided in the wall portion, and in the accommodating portion, a restricting member including a rigid convex portion and a spring biasing member are provided. When the drive shaft is inserted into the housing, the drive shaft is pressed by the biasing member so that the drive shaft is brought into pressure contact with the restricting member, and the drive shaft acts as the restricting member. A rotary sensor, wherein the rotary sensor is sandwiched by the biasing member. 2. The rotary sensor according to claim 1, wherein the convex portion forming the regulating member is formed in a direction orthogonal to an axial direction of the drive shaft. 3. The convex portion forming the regulating member projects from the wall portion of the rotating body toward the storage portion, and is formed integrally with the wall portion.
Alternatively, the rotary sensor according to the item 2. 4. The regulating member includes a plate-shaped portion and the convex portion protruding from the plate-shaped portion, and the regulating member is housed in the housing portion. Alternatively, the rotary sensor according to the item 2. 5. A spring-shaped U-shaped metal plate having first and second arm portions facing each other is provided, and the first arm portion is provided with the regulating member composed of the convex portion. At the same time, the urging member is configured by the second arm portion, and the metal plate is stored in the storage portion. 6. An engaging portion is provided on at least one of the first and second arm portions, and an engaging portion engaging with the engaging portion is provided on the wall portion, When the metal plate is stored in the storage part, the locking part and the engaging part are engaged with each other to prevent the metal plate from coming off the storage part. Item 5. The rotary sensor according to Item 5. 7. The pair of protrusions forming the restricting member are provided on the first arm portion at intervals, and the locking portion is provided between the pair of protrusions. The rotary sensor according to claim 6. 8. A bent portion having a hole is provided on the free end side of the second arm portion, and a projection provided at one end of the wall portion is inserted into the hole, and the projection is 8. The rotary sensor according to claim 5, wherein the pressing force of the biasing member against the drive shaft is increased by engaging with one end of the hole.