JP2007205952A - Torque sensor coil member - Google Patents

Abstract

A coil member for a torque sensor that can prevent contact between a coil conductor and a yoke member without reducing the accuracy of the torque sensor.
A first coil unit that constitutes a part of a coil unit that detects a torsion amount of a torsion bar in a housing includes a coil winding portion, an inner flange portion, an outer flange portion, and the inner flange. A first coil bobbin 15 integrally formed with a terminal mounting part 24 provided on the outer peripheral side of the part, and a notch that fits from the outer surface in the axial direction of the first coil bobbin and faces the terminal mounting part to the outside And a yoke member having a window. By providing a winding end guide groove 29 for guiding the terminal end portion 17b of the first coil conducting wire 17 drawn out from the coil winding portion toward the winding end terminal portion 26b on the upper surface 24a of the terminal mounting portion, the first coil conducting wire The terminal part was not exposed from the upper surface of the terminal mounting part.
[Selection] Figure 1

Description

  The present invention relates to a coil member for a torque sensor that is used for, for example, an electric power steering of a vehicle and detects a torque applied to a rotating body, and particularly prevents contact between a coil conductor and a yoke member. The present invention relates to a coil member for a torque sensor that can be used.

  As a conventional torque sensor coil member, for example, the one described in the following Patent Document 1 applied to a torque sensor of a vehicle power steering apparatus has been proposed.

  The coil member for the torque sensor includes a coil bobbin in which a pair of bobbins each winding a conducting wire are integrally formed in the axial direction, a yoke member fitted on both axial ends of the coil bobbin, and the bobbins. And a ring-shaped yoke member inserted into the ring.

  Each bobbin is made of a non-magnetic material, and has a cylindrical coil winding portion and flange portions provided on both the inner and outer ends of the coil winding portion, and the radial direction of the inner flange portion facing in the axial direction. It is integrally formed vertically along the axial direction via a terminal mounting portion and a connecting portion provided in a convex shape on the outside. On the other hand, a concave groove is formed in the peripheral end wall of each yoke member so as to avoid interference between each yoke member and the terminal mounting portion and the connecting portion.

  The terminal mounting portion has a winding start terminal portion, a winding end terminal portion, and a relay terminal portion arranged in parallel in a row on an outer end surface formed in a substantially rectangular shape, and each coil winding of the terminal mounting portion On the upper surface and the lower surface on the part side, winding start guide grooves for guiding the coil lead wire drawn out from the terminal portion at the start of winding to the coil winding portion side are provided symmetrically in the vertical direction.

  The rolling start guide groove has a step that obliquely crosses from the side surface on the terminal side of the winding start side on the upper surface and from the side surface on the relay terminal unit side on the lower surface toward the inner periphery side toward the coil winding portion. The outer end portions of the upper surface and the lower surface of the terminal mounting portion are formed slightly lower than the seating surfaces of the inner flange portions as viewed from the outer flange portions.

Therefore, the coil member for the torque sensor uses the guide grooves for starting the winding when winding the conducting wire to the coil winding portion, so that the starting end portion and the relay portion of the coil conducting wire and the yoke member are used. Interference with the inner bottom surface of the concave groove is prevented.
JP-A-10-78358

  In the conventional coil member for the torque sensor, the terminal portion of the coil conductor is drawn out from the coil winding portion to the winding end terminal portion side along the height of the seating surface of each inner flange portion. Therefore, it is necessary to ensure a clearance larger than at least the outer diameter of the coil conducting wire between the upper and lower surfaces of the terminal mounting portion and the inner bottom surface of the concave groove of each yoke member.

  However, it is preferable to form the concave groove as small as possible in order to prevent the magnetic path from being formed, and it is desirable that the concave groove be formed to have substantially the same size along the outer shape of the terminal mounting portion.

  However, if the clearance is made as small as possible in order to improve the accuracy of the torque sensor, the inner bottom surface of the concave groove of the yoke member may come into contact with the terminal portion of the coil conductor.

  The present invention has been devised by paying attention to such a technical problem, and it can prevent contact between the coil conductor and the yoke member without reducing the accuracy of the torque sensor. Is to provide.

  According to the first aspect of the present invention, there are provided a coil winding part formed of a nonmagnetic material in a substantially cylindrical shape, and a conductor wound around the outer periphery thereof, and flanges provided on both axial sides of the coil winding part. A coil bobbin, a terminal mounting portion integrally provided on one radial outer side of each of the flange portions, and a winding start terminal portion provided on the terminal mounting portion, to which a starting end portion and a terminal end portion of the coil conductor are respectively connected. And a yoke end terminal portion, and a yoke member that is formed in a substantially covered cylindrical shape by a magnetic material and is fitted on the coil bobbin and has a notch window that faces the terminal mounting portion to the outside on a peripheral end wall, A coil member for a torque sensor that detects a torque generated in the rotating shaft based on a change in impedance according to a torsional amount of the rotating shaft, the coil member being on the coil winding portion side of the terminal mounting portion Further, there is provided a winding end guide groove that is formed at least deeper than the outer diameter of the coil conducting wire from this surface and guides the terminal end portion of the coil conducting wire drawn out from the coil winding portion to the winding end terminal portion side. It is characterized by.

  According to the present invention, the terminal end of the coil lead wire drawn out from the coil winding portion is not exposed from the upper surface of the terminal mounting portion and is completely accommodated in the winding end guide groove, so that the winding end is completed. Since it is led to the terminal portion, it is possible to prevent contact between the terminal end portion of the coil conductor and the inner bottom surface of the cutout window of the yoke member.

  According to a second aspect of the present invention, the coil conductor is formed on the upper surface of the flange portion on the side of the terminal mounting portion so as to be deeper than at least the outer diameter of the coil conductor from this surface and is drawn out from the terminal portion. A winding start guide groove is provided for guiding the starting end portion of the coil to the coil winding portion side.

  According to the present invention, the coil winding wire is drawn in a state in which the starting end portion of the coil conductor drawn from the winding start terminal portion is completely accommodated in the winding end guide groove without being exposed from the upper surface of the flange portion. Since it is led to the part, the same effect as that of the first aspect can be obtained.

  According to a third aspect of the present invention, the winding end guide groove and the rolling start guide groove are formed in a step shape larger than at least the outer diameter of the coil conductor, and a start end portion and a terminal end portion of the coil conductor are provided. It is characterized by being arranged so as not to touch.

  According to this invention, although the start end portion and the end portion of the coil conductor intersect in the vicinity of the boundary between the flange portion and the terminal attachment portion, at least the winding end guide groove and the winding start guide groove By forming a step larger than the outer diameter of the coil conductor, the coil conductor can be wired without contacting the start end and the end.

  Hereinafter, embodiments of a coil member for a torque sensor according to the present invention will be described in detail with reference to the drawings. In this embodiment, a torque sensor coil member is applied to a torque sensor of a power steering device of a vehicle as in the prior art.

  As shown in FIG. 6, the torque sensor is fixed to the vehicle body, and in the housing 1 including the upper housing 1 a and the lower housing 1 b, an input shaft 2 having one end connected to a steering wheel (not shown), The output shaft 3 whose upper end is linked to the rack and pinion mechanism 5 is coaxially disposed in abutting state, and each is rotatably supported via a bearing.

  The input shaft 2 and the output shaft 3 are connected at their axially opposite ends via a torsion bar 4 made of a conductive metal material, and the torque acting between the two shafts is the amount of twist of the torsion bar 4. It is supposed to be converted.

  A worm wheel for transmitting the power of an electric motor (not shown) is integrally attached to the output shaft 3, and this electric motor applies a steering assist torque according to the torque of the shafts 2 and 3. It is supposed to be.

  The steering force input from the steering wheel is transmitted to the non-illustrated serpentine wheel via the input shaft 2, the torsion bar 4, the output shaft 3, and the rack and pinion mechanism 5. Yes.

  The input shaft 2 extends to the abutting portion with the output shaft 3 in a state where the lower end portion surrounds the torsion bar 4, and a reduced diameter portion on the lower end side is inserted into a recess on the upper end side of the output shaft 3 so as to be relatively rotatable. ing. Further, a stopper (not shown) that restricts the relative rotational angular position of both shafts 2 and 3 is provided in the reduced diameter portion of the input shaft 2 and the concave portion of the output shaft 3.

  Further, a first cylindrical member 6 is attached to the outer periphery on the lower end side of the input shaft 2 surrounding the torsion bar 4. The first cylindrical member 6 is formed of a nonmagnetic and conductive aluminum alloy material, and forms an inner magnetic path together with the lower end portion of the input shaft 2.

  In addition, a plurality of slit-shaped transmission windows 7a,..., 7b,... Are formed adjacently on the peripheral wall of the first cylindrical member 6 in two upper and lower stages at equal intervals along the circumferential direction. A beam portion (not shown) between the transmission windows 7a and 7a (7b and 7b) at each stage forms a shielding region that blocks the passage of magnetic flux. That is, in the first cylindrical member 6, regions having a large magnetic resistance and regions having a small magnetic resistance are alternately formed by the transmission windows 7a and 7b in each step and the beam portion.

  On the other hand, the output shaft 3 is fixed to the upper end portion thereof by caulking a second cylindrical member 8 that surrounds the lower end portion of the input shaft 2 and the outer peripheral side of the first cylindrical member 6 in a non-contact state with a predetermined gap. The second cylindrical member 8 is formed of an aluminum alloy material that is nonmagnetic and conductive, like the first cylindrical member 6, and the transmission wall 7 a of the first cylindrical member 6 is formed on the peripheral wall thereof. .., 9b... Are arranged at equal intervals in the circumferential direction in the upper and lower stages, and the transmission windows 9a and 9b at each stage are mutually offset in the circumferential direction. ing.

  That is, when the left and right steering torque is generated, that is, when the torsion bar 4 is twisted, the transmission windows 7a..., 7b. .., 9b... Are changed in accordance with the change in magnetic flux accompanying the change in the exposed area of the input shaft 3, and the first coil conductor 17 to be described later. And each impedance of the second coil 18 changes.

  Further, in the coil housing portion 10 provided at substantially the center position in the axial direction of the upper housing 1a, the outer peripheral sides of the transmission windows 9a,..., 9b,. The coil unit 11 is arranged and placed in a state.

  The coil unit 11 is a ring made of a pair of first coil unit 12 and second coil unit 13 and a magnetic material interposed between the first coil unit 12 and the second coil unit 13. Plate yoke 14.

  The coil unit 11 is housed in a state of abutting against a step formed in the coil housing part 10 and is urged downward by a disc spring 34 provided on one end side, while the other end side The axial position in the coil housing portion 10 is regulated by a lid-shaped cylindrical regulating member 35 provided at both ends and open at both ends.

  The first coil unit 12 and the second coil unit 13 include a stepped hollow cylindrical first coil bobbin 15 and a second coil bobbin 16 made of a non-magnetic material whose outer diameters on both axial ends are respectively increased. From the first coil conductor 17 and the second coil conductor 18 in which the conductors are wound on the outer peripheral sides of the coil bobbins 15 and 16, respectively, and the magnetic material fitted to the coil bobbins 15 and 16 from the outside in the axial direction. The first and second yoke members 19 and 20 each having a cylindrical shape with a lid are formed.

  In addition, since the said 1st coil unit 12 and the 2nd coil unit 13 are the same coil units combined vertically symmetrically in the said coil unit 11, only the 1st coil unit 12 is demonstrated below for convenience.

  As shown in FIGS. 1 and 3, the first coil bobbin 15 is provided on a coil winding portion 21 around which the first coil conductor 17 is wound, and on one end side of the coil winding portion 21. The inner flange portion 22 on the second coil bobbin 16 side, the outer flange portion 23 provided on the other end side, and the terminal mounting portion 24 provided protruding from the outer peripheral side of the inner flange portion 22 are integrated by molding. It is molded into.

  The terminal mounting portion 24 has a substantially rectangular shape, and a starting terminal in which the start end portion 17a and the end portion 17b of the first coil conductor 17 are respectively connected to the front surface serving as the end surface on the outer peripheral side of the inner flange portion 22. The part 26a and the end terminal part 26b are attached in parallel in the left-right width direction.

  The upper surface 22a of the inner flange portion 22 on the coil winding portion 21 side is provided with a winding start guide groove 25 for guiding the start of the start end portion 17a of the first coil conductor 17 drawn into the coil winding portion 21. It has been.

  The winding start guide groove 25 is cut from the connecting portion on one end side of the terminal mounting portion 24 to the connecting portion with the coil winding portion 21 toward the inner peripheral side of the inner flange portion 22. A stepped shape is formed by cutting from the terminal portion toward the other end portion of the terminal mounting portion 24, and this depth is set larger than the outer diameter of the first coil conductor 17.

  The winding start guide groove 25 includes a winding start guide surface 25a that guides the start of winding of the start end portion 17a of the first coil conductor 17 from one end side of the terminal mounting portion 24 to the coil winding portion 21, and the winding start guide. A groove bottom surface 25b formed at the same height as the top surface of the terminal mounting portion 24 from the surface 25a toward the terminal mounting portion 24, and the inner side of the guide surface 25a starting from the other end of the terminal mounting portion 24 And a side surface 25c formed toward the end.

  The terminal mounting portion 24 has an upper surface 24a on the coil winding portion 21 side formed at the same height as a groove bottom surface 25b of the guide groove 25 at the beginning of rolling, and a thickness in the vertical width direction is the inner flange. It is formed thicker than the portion 22.

  The terminal mounting portion 24 includes a left notch vertical groove 27a and a right notch vertical groove 27b having a substantially U-shaped cross section along the vertical width direction on both ends of the connecting portion with the inner flange portion 22, and front surfaces on both sides. A left-side notch horizontal groove 28a and a right-side notch horizontal groove 28b each having a substantially U-shaped longitudinal section penetrating from the side to the notch longitudinal grooves 27a, 27b along the front-rear width direction are respectively formed as notches. The depths of the vertical grooves 27a and 27b and the horizontal grooves 28a and 28b are set to be larger than at least the outer diameter of the first coil conductor 17.

  A winding end guide groove 29 is provided on the upper surface 24 a of the terminal mounting portion 24 to guide the winding end of the terminal end portion 17 b of the first coil conductor 17 drawn out from the coil winding portion 21.

  The whirling end guide groove 29 is formed in a step shape with respect to the whirling start guide groove 25, and is on the inner side in the left-right width direction of the terminal mounting portion 24 with respect to the outer end portion of the whirling start guide surface 25a. Inclining downward toward the winding end terminal portion 26b starting from a predetermined position at least larger than the outer diameter of the first coil conductor 17 from the winding start guide surface 25a in the vicinity of the coupling portion with the inner flange portion 22. It is cut into a shape.

  Specifically, the rolling end guide groove 29 is cut from the starting point to the position of the bottom front end side of the right notch vertical groove 27b in the fold line direction of the outer peripheral end portion of the inner flange portion 22, and more than this notch. It is comprised from the inclined surface 30 formed in the outer side, and the rolling end guide surface 31 which is a side surface formed by this inclined surface 30. As shown in FIG. The surface on the other end side of the terminal mounting portion 24 from the lower end portion of the inclined surface 30 is cut out in parallel to the lower surface of the terminal mounting portion 24 along the same height as the lower end portion of the inclined surface 30 and is flat. It is formed in a shape.

  The inclined surface 30 is inclined at an angle such that the height of the winding end guide surface 31, which is the depth of the winding end guide groove 29, is larger than the outer diameter of the first coil conductor 17.

  As shown in FIG. 2, the first yoke member 19 has an annular bottom wall 19a and a cylindrical peripheral wall 19b whose outer diameter is set to be substantially the same as the inner diameter of the coil housing portion 10, The coil bobbin 15 is fitted from the axial direction.

  Further, as shown in FIGS. 2 and 4, a notch window 32 formed in a substantially rectangular shape is provided at the edge of the peripheral wall 19 b of the first yoke member 19. The cutout window 32 is set to have a width slightly larger than the length in the left-right width direction of the terminal mounting portion 24, and the inner bottom surface 32 a and the inner flange portion when the cutout window 32 is fitted on the first coil bobbin 15. The depth is set such that a slight gap is formed between the upper surface 22a and the upper surface 22a.

  The plate yoke 14 has an annular shape, an inner diameter is set to be substantially the same as the inner diameter of the coil bobbin 15, and an outer diameter is set to be substantially the same as the outer diameter of the peripheral wall 19 b of the yoke member 19. The plate yoke 14 has a substantially trapezoidal cutout groove 33 formed in the outer peripheral edge so as to avoid the terminal mounting portion 24.

  Next, the procedure for assembling the coil unit 11 will be described. First, as shown in FIG. 1, after winding a lead wire to the starting terminal portion 26a of the first coil unit 12, the inside of the left notch lateral groove 28a And wrap around the terminal mounting portion 24 to the back side of the terminal mounting portion 24 and hook it in the left notch vertical groove 27a.

  Then, as shown in FIGS. 1 and 5, the start end portion 17 a of the first coil conductor 17 is drawn toward the coil winding portion 21 side along the winding start guide surface 25 a, and the coil winding portion 21. After winding a predetermined number of turns on the outer periphery, the terminal end portion 17b of the first coil conductor 17 is pulled out toward the right notch vertical groove 27b along the guide end guide surface 31.

  Further, as shown in FIG. 1, the terminal end portion 17b of the first coil conductor 17 is drawn into the right notch vertical groove 27b, and is wound around the front surface side of the terminal mounting portion 24 via the right notch lateral groove 28b. After that, it is rubbed against the terminal portion 26b. As shown in FIG. 2, the first coil member 12 is fitted onto the first coil bobbin 15 on which the first coil conductor 17 is wound, whereby the assembly of the first coil unit 12 is completed.

  Subsequently, after the second coil unit 13 is assembled in the same manner as the first coil unit 12, the first coil unit 12 and the second coil unit 13 are respectively connected to the bottom walls of the yoke members 19 and 20. The terminal mounting portions are abutted to face each other in the axial direction, and the plate yoke 14 is inserted into the gap between the inner flange portions of the coil units 12 and 13 formed thereby. The coil unit 11 is completely assembled by inserting the terminal mounting portion 24 so as to be fitted.

  Thus, in the wiring state of the first end 17a and the end 17b of the first coil conductor 17 wound around the first coil bobbin 15, the end of the first coil conductor 17 drawn out from the coil winding 21 is used. The portion 17b is drawn out along the inclined surface 30 and the winding end guide surface 31 so that the portion 17b is guided to the side of the winding end terminal portion 26b while being completely accommodated in the winding end guide groove 29. The terminal mounting portion 24 is not exposed above the upper surface 24a.

  Similarly to the end portion 17b of the first coil conductor 17, the start end portion 17a of the first coil conductor 17 is also drawn toward the coil winding portion 21 along the guide start surface 25a and the groove bottom surface 25b. Therefore, it is not exposed above the upper surface 22 a of the inner flange portion 22.

  Further, since the start end portion 17a of the first coil conductor 17 is drawn from the terminal portion 26a to the guide groove 25 side through the left notch lateral groove 28a, it is completely accommodated in the left notch lateral groove 28a. On the other hand, since the terminal portion 17b of the first coil conductor 17 is drawn out from the winding end guide groove 29 to the terminal portion 26a side through the right notch horizontal groove 28b, the right notch horizontal groove is provided. It is wired in a state of being completely accommodated in 28b.

  That is, when the first yoke member 19 is fitted on the first coil bobbin 15, the inner bottom surface 32a of the cutout window 32 of the first yoke member 19 is positioned slightly higher than the upper surface 22a of the inner flange portion 22. The both inner side surfaces of the cutout window 32 are positioned at positions slightly separated from the terminal mounting portion 24 in the left-right width direction, respectively, while the start end portion of the first coil conductor 17 straddling the cutout window 32 Since 17a and termination part 17b are both in the wiring state as described above, in particular, inner bottom surface 32a of notch window 32 of first yoke member 19 and start end part 17a and termination part 17b of first coil conductor 17 are provided. There is no contact.

  Further, when the end portion 17 b of the first coil conductor 17 is drawn into the end guide groove 29, the start end portion 17 a and the end portion 17 b of the first coil conductor 17 are connected to the flange portion 22 and the terminal mounting portion 24. The groove depth of the winding start guide groove 25 is set to be larger than the outer diameter of the first coil conducting wire 17 and the winding start guide groove 25 and the winding end guide groove 29 Are spaced apart from the outer diameter of the first coil conductor 17 so that the start end portion 17a and the end portion 17b of the first coil conductor 17 do not come into contact with each other.

  Therefore, according to this embodiment, since the winding end guide groove 29 is provided on the upper surface 24a of the terminal mounting portion 24, the terminal end portion 17b of the first coil conductor 17 drawn out from the coil winding portion 21 is provided. Contact with the inner bottom surface 32a of the cutout window 32 of the yoke member 19 is avoided. As a result, the terminal end 17b of the first coil conductor 17 is not short-circuited or disconnected.

  In addition, since the guide groove 25 is provided at the upper surface 22a of the inner flange portion 22, the start end portion 17a of the first coil conductor 17 to be drawn to the coil winding portion 21 side and the cutout window of the yoke member 19 are provided. Contact with the inner bottom surface 32a of 32 is also avoided.

  Further, since the winding start guide groove 25 and the winding end guide groove 29 are provided to be spaced apart from the outer diameter of the first coil conducting wire 17, the starting end portion 17 a and the terminating end portion 17 b of the first coil conducting wire 17 are provided. Even if they intersect, both end portions 17a and 17b do not contact each other.

  Further, since the rolling end guide groove 29 is provided toward the front end side of the right notch vertical groove 27b in the fold line direction of the outer peripheral end portion of the inner flange portion 22, the winding end is the outermost peripheral side. The terminal end portion 17b of the first coil conductor 17 can be smoothly guided to the side of the winding end terminal portion 26b by the winding end guide groove 29.

  Further, since the groove bottom surface of the winding end guide groove 29 is formed on the inclined surface 30, the end portion 17 b of the first coil conductor 17 drawn out from the coil winding portion 21 is separated by the inclined surface 30. The end terminal portion 26b can be guided more smoothly.

  Next, a second embodiment of the present invention will be described with reference to FIG. 7. The basic configuration is the same as that of the first embodiment, and the difference is the first embodiment in the first embodiment. The coil bobbin 15 and the second coil bobbin 16 were formed integrally with each other via the terminal mounting portion 36 to form one coil bobbin 37.

  According to this embodiment, since the coil bobbin 37 is integrally formed through the terminal mounting portion 36, the number of component parts can be reduced, and the manufacturing cost can be reduced.

  The technical ideas other than the invention described in the claims, as grasped from the embodiment, will be described below.

  The coil member for a torque sensor according to claim 1, wherein the winding end guide groove is provided from the outer peripheral end portion of the flange portion toward the winding end terminal portion side in a fold line direction. .

  According to this invention, since the winding end after winding the coil is the outermost peripheral side of the coil, the winding end guide groove is formed from the outer peripheral end portion of the flange portion toward the folding end terminal portion side. By being provided toward the end, the terminal portion of the coil conductor can be smoothly drawn out and routed to the end terminal portion.

  The torque sensor coil member according to claim 1, wherein a groove bottom surface of the winding end guide groove is provided so as to be inclined in an axial direction toward the terminal mounting portion.

  According to this invention, by providing the groove bottom surface of the winding end guide groove so as to be inclined in the axial direction toward the terminal mounting portion side, the terminal end portion of the coil conductor wire can be more smoothly drawn out and the winding is performed. Can be routed to the end terminal.

  The axial position of the groove bottom surface of the rolling start guide groove is provided closer to the coil winding part than the axial position of the groove bottom surface of the rolling end guide groove. The coil member for torque sensors described in 1.

  According to the present invention, by providing the axial position of the groove bottom surface of the rolling start guide groove closer to the coil winding portion than the axial position of the groove bottom surface of the winding end guide groove, the rolling start guide is provided. Contact between the start end of the coil conductor guided by the groove and the end of the coil conductor guided by the winding end guide groove can be prevented.

  (4) The coil bobbin is arranged in two axial stages in series in the axial direction, and both the coil bobbins are integrally formed via terminal attachment portions of the coil bobbins. Coil member for torque sensor.

  According to the present invention, the number of components can be reduced by integrally forming the coil bobbins via the terminal mounting portions of the coil bobbins, and the manufacturing cost can be reduced.

The present invention is not limited to the configuration of each of the above embodiments, and for example, the shape, size, and quantity of each of the coil bobbins 15, 16 can be freely changed according to the specification and size of the automobile. The rolling end guide groove 29 is not limited to a step shape, and even if it is a concave groove having a groove width and a groove depth larger than the outer diameter of each of the coil conducting wires 17 and 18, The same effect as each embodiment can be produced.

  Further, the groove bottom surfaces 25b, 30 of the winding start guide groove 25 and the winding end guide groove 29 are flat if the groove depth is formed larger than the outer diameter of each of the coil conductors 17, 18. It may be inclined.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows 1st Embodiment which concerns on this invention, and demonstrates the principal part of this invention. 1 is a perspective view of a torque sensor coil member according to a first embodiment of the present invention. FIG. It is a perspective view of the coil bobbin which concerns on this invention. FIG. 3 is an arrow view seen from an arrow A in FIG. 2. FIG. 5 is a plan view of FIG. 4. 1 is a schematic view of a power steering apparatus according to the present invention. The 2nd Embodiment which concerns on this invention is shown, and it is a front view of the coil member for torque sensors.

Explanation of symbols

15 ... 1st coil bobbin (coil bobbin)
16 ... 2nd coil bobbin (coil bobbin)
17 ... 1st coil conducting wire (coil conducting wire)
17a: Start end of first coil conductor (start end of coil conductor)
17b ... Termination part of first coil conductor (termination part of coil conductor)
18 ... Second coil conductor (coil conductor)
19: First yoke member (yoke member)
20 ... 2nd yoke member (yoke member)
21 ... Coil winding part 22 ... Inner flange part (flange part)
23 ... Outer flange (flange)
24 ... Terminal mounting portion 25 ... Whisper start guide groove 26a ... Whisper start terminal portion 26b ... Whisper end terminal portion 29 ... Whisper end guide groove 32 ... Notch window 36 ... Terminal attachment portion

Claims (3)

A coil bobbin which is formed in a substantially cylindrical shape by a nonmagnetic material and has a coil winding part around which a conducting wire is wound and flanges provided on both axial ends of the coil winding part;
A terminal mounting portion integrally provided on one radially outer side of each flange portion;
A winding start terminal portion and a winding end terminal portion provided in the terminal mounting portion, to which a start end portion and a termination end portion of the coil conductor are respectively connected;
A yoke member which is formed in a substantially covered cylindrical shape by a magnetic material and is fitted on the coil bobbin and has a notch window on the peripheral end wall so that the terminal mounting portion faces the outside;
With
A torque sensor coil member that detects torque generated in the rotating shaft based on a change in impedance according to a torsion amount of the rotating shaft,
On the upper surface of the terminal mounting portion on the coil winding portion side, the terminal end portion of the coil conductor wire formed at least deeper than the outer diameter of the conductor wire from this surface and drawn out from the coil winding portion is the winding end terminal portion. A coil member for a torque sensor, characterized in that a winding end guide groove for guiding to the side is provided. On the upper surface of the flange portion on the side of the terminal mounting portion, at least the outer diameter of the coil conductor wire is formed from this surface, and the starting end portion of the coil conductor wire that is drawn out from the terminal portion starts to be the coil winding portion. The coil member for a torque sensor according to claim 1, further comprising a guide groove at the beginning of rolling. The winding end guide groove and the winding start guide groove are formed in a step shape larger than at least the outer diameter of the coil conductor, and are arranged so that the start end and the end of the coil conductor do not contact each other. The coil member for torque sensors according to claim 1 or 2.

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