JP2018036206A - Sensor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor device that can restrain movements of magnetism collecting holders and a magnetic shield relative to each other.SOLUTION: A first magnetism collecting holder 32a has a first ring part 33 and a substrate housing 34. A second magnetism collecting holder 32b has a second ring part 35 and a substrate housing 36. In the parts of the first magnetism collecting holder 32a and the second magnetism collecting holder 32b on the side reverse to the extending directions of the substrate housings 34, 36, projections 110 formed by combining a projection 110a and a projection 110b are disposed. In a magnetic shield 40, a through hole 100 penetrating in the diametric direction is bored. The projections 110 disposed on the outer circumferential faces of the first magnetism collecting holder 32a and the second magnetism collecting holder 32b are inserted into the through hole 100 bored in the magnetic shield 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sensor device.

  Conventionally, as shown in Patent Document 1, a torque detection device that detects a torque applied to a rotating shaft is known as a sensor device. The rotating shaft is composed of an input shaft, an output shaft, and a torsion bar that connects the input shaft and the output shaft.

  The torque detector includes a pair of permanent magnets fixed to the input shaft, a plurality of magnetic yokes fixed to the output shaft and forming a magnetic circuit corresponding to the magnetic field of the permanent magnet, and a pair of magnetic fluxes induced from the magnetic yokes It has a magnetism collecting ring, an insulator magnetism collecting holder that holds the magnetism collecting ring, and a magnetic sensor that detects a magnetic flux induced in the magnetism collecting ring. Further, in such a torque detection device, a magnetic shield may be provided on the outer periphery of the magnetism collecting holder so as to surround the magnetism collecting ring in order to block external magnetic field noise.

  The magnetic flux collecting holder of the torque detection device of Patent Document 1 is configured by combining a first magnetic flux collecting holder and a second magnetic flux collecting holder. A magnetic sensor is disposed between the first magnetic flux collecting holder and the second magnetic flux collecting holder. Both ends of the magnetic shield in the circumferential direction are fixed by a first magnetic flux collecting holder and a second magnetic flux collecting holder.

JP2015-31600A

  By the way, there is a concern that the first magnetic flux collecting holder, the second magnetic flux collecting holder, and the magnetic shield may be displaced from each other due to vehicle vibration or the like. In this respect, since both end portions in the circumferential direction of the magnetic shield are fixed by the first magnetic flux collecting holder and the second magnetic flux collecting holder, both end portions of the magnetic shield are fixed to the first magnetic flux collecting holder and the second magnetic flux collecting holder. Movement relative to the holder is restricted.

  However, since the center portion of the magnetic shield is not fixed to the magnetic flux collecting holder, the magnetic shield may move relative to the first magnetic flux collecting holder and the second magnetic flux collecting holder. In addition, the first and second magnetism collecting holders move relative to each other in the axial direction, so that the first and second magnetism collecting holders move relative to each other. There is also a possibility that the magnetic shield may move with respect to the first magnetic flux collecting holder and the second magnetic flux collecting holder. Even if the first magnetic flux collecting holder and the second magnetic flux collecting holder are integrated, the magnetic shield may move relative to the magnetic flux collecting holder.

  The objective of this invention is providing the sensor apparatus which can suppress the relative movement of a magnetism collection holder and a magnetic shield.

  A sensor device capable of achieving the above object includes a permanent magnet, a magnetic yoke arranged in a magnetic field formed by the permanent magnet, and a relative position of the permanent magnet changing, and surrounding the magnetic yoke. An arranged cylindrical magnetism collecting holder, a magnetism collecting ring that is attached to the inner circumferential surface of the magnetism collecting holder and collects the magnetic flux of the magnetic yoke, and a magnetic shield that is fitted and attached to the outer circumferential surface of the magnetism collecting holder And a magnetic sensor for detecting a magnetic flux of a magnetic circuit formed by the permanent magnet, the magnetic yoke, and the magnetic flux collecting ring. In order to suppress relative movement of the magnetic shield, a part of the magnetic flux collecting holder and a part of the magnetic shield are fitted to each other.

  According to this configuration, a part of the magnetic flux collecting holder and a part of the magnetic shield are fitted to each other, so that even when the magnetic shield is about to move relative to the magnetic flux collecting holder, Is caught on a part of the magnetic shield. For this reason, relative movement of the magnetism collecting holder and the magnetic shield can be suppressed.

  In the above sensor device, at least one of the first protrusion and the first recess is provided as the part on at least one of the magnetic flux collecting holder and the magnetic shield. It is preferable that at least one of a second recess that fits in the first projection and a second projection that fits in the first recess is provided as at least the other part.

  According to this configuration, at least one of the first protrusion and the first recess fits into at least one of the second recess and the second protrusion. Even if the magnetic shield is about to move with respect to the magnetic flux collecting holder, the magnetic shield moves with respect to the magnetic flux collecting holder because the first protrusion is caught by the second concave portion and the second projection is caught by the first concave portion. It is suppressed. For this reason, relative movement of the magnetism collecting holder and the magnetic shield can be suppressed.

  In the sensor device, the magnetic flux collecting holder is formed by assembling the first magnetic flux collecting holder and the second magnetic flux collecting holder that are divided in the axial direction, and the first magnetic flux collecting holder and the second magnetic flux collecting holder. Each of the magnetic flux collecting holders is provided with the first protrusion, and the magnetic shield is provided with the second concave portion, and the first magnetic flux collecting holder includes the first protrusion and the second magnetic flux collecting holder. It is preferable that the first protrusion of the magnetic holder is inserted into the second recess.

  According to this configuration, even if the first magnetic flux collecting holder and the second magnetic flux collecting holder try to move away from each other, the first protrusion is caught by the second concave portion, so that the first magnetic flux collecting holder And the second magnetic flux collecting holder are prevented from separating from each other. For this reason, the relative movement of the first magnetic flux collecting holder, the first magnetic flux collecting holder, and the magnetic shield can be suppressed.

  In the sensor device, the first protrusion is divided into two along a mating surface of the first magnetic flux collecting holder and the second magnetic flux collecting holder, and the first magnetic flux collecting holder side It is preferable that the divided first protrusion and the divided first protrusion on the second magnetism collecting holder side are combined and inserted into the second recess of the magnetic shield.

  According to this configuration, even if the first magnetic flux collecting holder and the second magnetic flux collecting holder try to move away from each other, the first protrusion on the first magnetic flux collecting holder side and the second magnetic flux collecting holder side The first magnetic flux collection holder and the second magnetic flux collection holder are suppressed from being separated from each other by being inserted into the second concave portion in a state in which the first projection is aligned. In addition, the movement of the magnetic shield with respect to the first and second magnetic flux collecting holders is also suppressed.

  In the sensor device, the first protrusion, the first recess, the second protrusion, and the second recess are provided in a portion corresponding to an open portion in a circumferential direction of the magnetism collecting ring. Preferably it is.

  According to this configuration, for example, even if the first and second recesses are provided in the magnetic shield, an external magnetic field or the like enters the magnetic shield and collects through the first and second recesses. Influencing the magnetic ring is suppressed.

  In the above sensor device, a plurality of the first protrusion and the second recess, and at least one of the second protrusion and the first recess may be provided in the circumferential direction of the magnetism collecting ring. .

  According to this configuration, at least one of the first protrusion and the second recess, and the second protrusion and the first recess is provided in the circumferential direction, so that the first magnetism collecting holder and the second magnetism collecting holder are provided. Since the magnetic holder and the magnetic shield are engaged in more places, the relative movement of the first magnetic flux collecting holder, the second magnetic flux collecting holder, and the magnetic shield can be further suppressed.

  According to the sensor device of the present invention, the relative movement of the magnetism collecting holder and the magnetic shield can be suppressed.

The schematic block diagram of the torque detection apparatus of 1st Embodiment. The disassembled perspective view which shows the structure of the torque detection apparatus of 1st Embodiment. The disassembled perspective view which shows the structure of the torque detection apparatus of 1st Embodiment. (A)-(c) is a figure which shows schematic structure of the recessed part provided in the magnetic shield of a torque detection apparatus, and the protrusion provided in the magnetic flux collection ring engaged with a recessed part. The disassembled perspective view which shows the structure of the torque detection apparatus of 2nd Embodiment. The disassembled perspective view which shows the structure of the torque detection apparatus of 3rd Embodiment.

<First Embodiment>
Hereinafter, a first embodiment of a torque detection device as a sensor device will be described.
As shown in FIG. 1, the torque detection device 10 includes a torsion bar 22 that connects an input shaft 20 and an output shaft 21, a permanent magnet 23 that is connected to the input shaft 20, and a cylindrical shape that is connected to the output shaft 21. Yoke 24 and a cylindrical magnetic flux collecting unit 30 arranged so as to cover the periphery of the yoke 24.

  The outer diameter of the torsion bar 22 is smaller than the outer diameters of the input shaft 20 and the output shaft 21. The input shaft 20 and the output shaft 21 are coaxially connected via a torsion bar 22.

  The yoke 24 is fixed to the output shaft 21 while being arranged coaxially with the output shaft 21. The yoke 24 is provided around the permanent magnet 23 with a certain gap. The yoke 24 includes two magnetic yokes 24a and 24b. On the magnetic yokes 24a and 24b, isosceles triangular claws 25a extending in a direction perpendicular to the plane of the plate-like annular portion 25 are provided at equal intervals in the circumferential direction. Each claw 25a is molded by the synthetic resin body 26 in a state where the claws 25a are displaced in the circumferential direction at regular intervals and face each other in the axial direction. Note that the surfaces of the magnetic yokes 24 a and 24 b that face the permanent magnet 23 are exposed from the synthetic resin body 26.

  Further, in a neutral state where no torque is applied to the input shaft 20, the tips of the claws 25 a of the magnetic yokes 24 a and 24 b point to the boundary between the N pole and the S pole of the permanent magnet 23.

  The magnetic flux collecting unit 30 includes two magnetic flux collecting rings 31a and 31b for guiding magnetic fluxes from the magnetic yokes 24a and 24b, a first magnetic flux collecting holder 32a and a second magnetic flux collecting ring 31a and 31b, respectively. The magnetic flux collection holder 32b and the magnetic shield 40 which covers the outer periphery of the magnetic flux collection rings 31a and 31b are provided. The first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b are combined in the axial direction to constitute the magnetic flux collecting holder 32.

  As shown in FIG. 2, the first magnetic flux collecting holder 32 a includes an annular first ring portion 33 and a square plate that is integrally connected to the outer peripheral surface of the first ring portion and protrudes radially outward. The board | substrate accommodating part 34 is formed. A plurality (four) of concave portions 38 are provided on the inner peripheral surface of the first ring portion 33 of the first magnetic flux collecting holder 32a. The first magnetism collecting holder 32a is made of, for example, a synthetic resin.

  As shown in FIG. 1, a magnetism collecting ring 31 a is held on the inner peripheral surface of the first ring portion 33, and the inner peripheral surface of the first ring portion 33 is spaced from the outer peripheral surface of the yoke 24 in the radial direction. Is facing through. The magnetic yoke 24a and the magnetism collecting ring 31a are opposed to each other with a gap in the radial direction. Further, the magnetic yoke 24b and the magnetism collecting ring 31b are opposed to each other via a gap in the radial direction.

In addition, a plurality of flange portions 33a protruding outward in the radial direction are provided on the end surface of the first ring portion 33 opposite to the second magnetism collecting holder 32b.
As shown in FIG. 2, the second magnetism collecting holder 32 b includes an annular second ring portion 35 and a square that is integrally connected to the outer peripheral surface of the second ring portion 35 and protrudes radially outward. And a plate-like substrate housing portion 36. The second magnetism collecting holder 32b is made of, for example, a synthetic resin. A substrate (not shown) provided with a Hall IC 50 is disposed in the substrate housing portion 36. The inner diameter and outer diameter of the second ring portion 35 are the same as the inner diameter and outer diameter of the first ring portion 33 of the first magnetism collecting holder 32a. As shown in FIG. 1, a magnetism collecting ring 31 b is held on the inner peripheral surface of the second ring portion 35. The magnetic yoke 24a and the magnetism collecting ring 31b are arranged to face each other with a gap in the radial direction. Further, the magnetic yoke 24b and the magnetism collecting ring 31b are arranged to face each other with a gap in the radial direction.

In addition, a plurality of flange portions 35 a protruding outward in the radial direction are provided on the end surface of the second ring portion 35 opposite to the first magnetic flux collecting holder 32 a.
The magnetism collecting ring 31 a and the magnetism collecting ring 31 b are assembled in parallel to each other, and the Hall IC 50 is accommodated in the substrate accommodating portion 36. The Hall IC 50 is connected to an ECU or the like provided outside via a cord 51.

  As shown in FIG. 3, the first magnetic flux collecting holder 32 a is provided with a locking portion 39. The locking portion 39 provided in the first magnetic flux collecting holder 32a is provided in a portion of the first magnetic flux collecting holder 32a opposite to the direction in which the substrate housing portion 34 extends. Both end portions in the circumferential direction of the magnetism collecting ring 31 a are locked by protrusions 39 a provided on the radially inner side of the locking portion 39.

  The second magnetic flux collecting holder 32b is also provided with a locking portion 39. The locking portion 39 provided in the second magnetic flux collecting holder 32b is provided in a portion of the second magnetic flux collecting holder 32b opposite to the direction in which the substrate housing portion 36 extends. Both end portions in the circumferential direction of the magnetism collecting ring 31b are locked by protrusions 39b provided on the radially inner side of the locking portion 39.

  A pair of flanges 60 and 61 are provided on both side surfaces of the substrate housing portion 36 in the direction orthogonal to the direction extending from the second magnetism collecting holder 32b. The collars 60 and 61 have a rectangular parallelepiped shape. The collars 60 and 61 are provided orthogonal to the substrate housing portion 34. In the overlapping direction of the substrate housing portion 34 and the substrate housing portion 36, the lengths of the flanges 60 and 61 are set longer than the length (thickness) of the substrate housing portion 36. The flanges 60 and 61 protrude in the overlapping direction with respect to the substrate housing portion 36. Guide grooves 60a and 61a are provided on the end surfaces of the flange 60 and the flange 61 facing each other. The guide grooves 60 a and 61 a extend along the overlapping direction of the substrate housing portion 34 and the substrate housing portion 36.

  A plate-like partition wall 62 extending along the overlapping direction of the substrate housing portion 34 and the substrate housing portion 36 is provided on the end surface of the substrate housing portion 34 opposite to the substrate housing portion 36. Flange portions 63 projecting sideways are provided at portions on the first ring portion 33 side on both side surfaces of the partition wall 62. The portions where the flange portions 63 are not provided on both side surfaces of the partition wall 62 are flush with the both side surfaces of the substrate housing portion 34. The flange portion 63 of the partition wall 62 is fitted in the guide grooves 60 a and 61 a of the flanges 60 and 61.

  The substrate housing portion 36 is provided with a plurality (four) of engagement protrusions 36 a extending toward the substrate housing portion 34. When the first magnetic flux collecting holder 32a (substrate accommodating portion 34) and the second magnetic flux collecting holder 32b (substrate accommodating portion 36) are overlapped, the engagement protrusion 36a extending from the substrate accommodating portion 36 is a substrate in the substrate accommodating portion 34. It engages with the end surface opposite to the accommodating portion 36 (see FIG. 1). Thereby, the 1st magnetism collection holder 32a and the 2nd magnetism collection holder 32b are assembled.

  As shown in FIG. 1, a magnetic shield 40 is fitted to the outer peripheral surface of the first ring portion 33 and the outer peripheral surface of the second ring portion 35. As the material of the magnetic shield 40, for example, a material that can block magnetism such as metal is adopted. The magnetic shield 40 is provided curved in a C-shaped cross section. Further, the length of the magnetic shield 40 in the axial direction is set slightly longer than the total length of the first ring portion 33 and the second ring portion 35 in the axial direction. When the engagement protrusion 37 is engaged with the recess 38, both end portions in the axial direction of the magnetic shield 40 are axially connected to the flange portion 33 a of the first ring portion 33 and the flange portion 35 a of the second ring portion 35. In between. Thereby, the magnetic shield 40 is fixed between the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b.

  Further, an engagement groove 41a is provided in a portion corresponding to both end portions 40a of the magnetic shield 40 on the outer peripheral surface of the first magnetic flux collecting holder 32a. In addition, an engagement groove 41b is provided in a portion corresponding to both ends 40a in the circumferential direction of the magnetic shield 40 on the outer peripheral surface of the second magnetism collecting holder 32b. By inserting both end portions 40a of the magnetic shield 40 into the engaging grooves 41a and 41b, the magnetic shield 40 is axially and radially oriented with respect to the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b. It is regulated that the position is displaced.

  By the way, a through hole 100 (concave portion) penetrating in the radial direction is provided in a central portion in the circumferential direction of the magnetic shield 40 and a central portion in the axial direction. In addition, a cylindrical projection 110 protruding from the outer peripheral surface is provided on a portion of the first magnetism collecting holder 32a and the second magnetism collecting holder 32b opposite to the extending direction of the substrate housing portions 34 and 36. . The protrusion 110 is configured by combining the protrusion 110a provided on the first magnetism collecting holder 32a and the protrusion 110b provided on the second magnetism collecting holder 32b. The protrusion 110a and the protrusion 110b are obtained by dividing the cylindrical protrusion 110 along the mating surfaces of the first magnetism collecting holder 32a and the second magnetism collecting holder 32b. The protrusions 110 provided on the outer peripheral surfaces of the first magnetism collecting holder 32 a and the second magnetism collecting holder 32 b are inserted into the through holes 100 provided in the magnetic shield 40 from the inside.

  As shown in FIG. 2, the protrusion 110a is provided on a portion on the opposite side of the circumferential direction of the first magnetic flux collecting holder 32a from the direction in which the substrate housing portion 34 extends. The protrusion 110a has a shape obtained by dividing the cylinder into two along its axis. The protrusion 110a is provided on the outer peripheral surface of the first magnetic flux collecting holder 32a on the second magnetic flux collecting holder 32b side. The mating surface of the projection 110a with the projection 110b is the same surface as the end surface of the first magnetism collecting holder 32a on the second magnetism collecting holder 32b side.

  Further, the protrusion 110b is provided on a portion on the opposite side to the extending direction of the substrate housing portion 36 in the circumferential direction of the second magnetism collecting holder 32b. The protrusion 110b also has a shape obtained by dividing the cylinder into two along its axis. The protrusion 110b is provided on a portion on the first magnetic flux collecting holder 32a side on the outer peripheral surface of the second magnetic flux collecting holder 32b. The mating surface of the projection 110b with the projection 110a is the same surface as the end surface of the second magnetism collecting holder 32b on the first magnetism collecting holder 32a side.

  As shown in FIG. 4A, the protrusions 110 (protrusions 110a and 110b) are portions of the portions where the locking portions 39 are provided in the circumferential direction of the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b. It is provided on the outer surface. The through hole 100 is also provided on the outer surface of the portion where the locking portion 39 is provided in the circumferential direction of the magnetic shield 40. For this reason, the protrusion 110 and the through hole 100 are provided at the same position as the gap between both end portions of the magnetism collecting rings 31a and 31b. Since the through hole 100 is provided in a portion without the magnetic flux collecting rings 31a and 31b, even if an open portion (through hole 100) is provided in a part of the magnetic shield 40, the magnetic flux collecting rings 31a and 31b are adversely affected magnetically. Occurrence is suppressed.

  As shown in FIG. 4B, the protrusion 110a is provided at a position displaced from the magnetism collecting ring 31a in the axial direction of the first magnetism collecting holder 32a. The protrusion 110b is provided at a position shifted from the magnetism collecting ring 31b in the axial direction of the second magnetism collecting holder 32b. Further, the lengths of the protrusion 110 a and the protrusion 110 b are set longer than the thickness of the magnetic shield 40.

  As shown in FIG. 4C, the cylindrical protrusion 110 configured by combining the cylindrical dividing surfaces of the protrusion 110 a and the protrusion 110 b with each other engages with the through hole 100 of the magnetic shield 40.

The operation and effect of this embodiment will be described.
When the magnetic shield 40 is assembled to the first magnetism collecting holder 32a and the second magnetism collecting holder 32b, a part of the first magnetism collecting holder 32a (protrusion 110a) and a part of the second magnetism collecting holder 32b (protrusion 110b). Are inserted into the through-hole 100 provided in the magnetic shield 40 from the inside.

  In the magnetic shield 40, both end portions 40a in the circumferential direction of the magnetic shield 40 are inserted into the engaging grooves 41a and 41b, so that both end portions 40a are connected to the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b. It is fixed. Further, by inserting the projections 110a and 110b of the first magnetic flux collection holder 32a and the second magnetic flux collection holder 32b into the through hole 100 provided in the magnetic shield 40, the central portion in the circumferential direction of the magnetic shield 40 Are fixed to the first magnetism collecting holder 32a and the second magnetism collecting holder 32b. The magnetic shield 40 is fixed to the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b at three locations, both end portions and a central portion in the circumferential direction.

  Further, both end portions in the axial direction of the magnetic shield 40 are sandwiched between the flange portion 33a of the first ring portion 33 and the flange portion 35a of the second ring portion 35 in the axial direction, so that the magnetic shield 40 has the first shape. The magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b are fixed.

  By the way, it is also conceivable that the first magnetism collecting holder 32a and the second magnetism collecting holder 32b try to move in directions away from each other in the axial direction. When the magnetic shield 40 is not provided with the through hole 100, the first magnetic flux collecting holder 32a is not provided with the protrusion 110, and the second magnetic flux collecting holder 32b is not provided with the second protrusion 100, the magnetic shield 40 is provided. Moves upward in FIG. 1 together with the flange portion 33a or downward in FIG. 1 together with the flange portion 35a. This is because when the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b are about to move away from each other, the movement cannot be restricted. Thereby, the relative positional relationship between the first magnetic flux collecting holder 32a, the second magnetic flux collecting holder 32b, and the magnetic shield 40 changes.

  In this regard, in the present embodiment, the protrusion 110 a and the protrusion 110 b are engaged with the through hole 100. As a result, even if the first magnetism collecting holder 32a and the second magnetism collecting holder 32b try to move away from each other, the projection 110a is caught in the through hole 100, and the projection 110b is also caught in the through hole 100. The magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b are prevented from separating from each other. For this reason, it is suppressed that the relative positional relationship of the 1st magnetism collection holder 32a, the 2nd magnetism collection holder 32b, and the magnetic shield 40 changes.

  Moreover, even if the magnetic shield 40 is provided with the through hole 100 by providing the protrusion 110 and the through hole 100 at the same position as the open portion between both ends of the magnetism collecting rings 31a and 31b, the through hole The influence of an external magnetic field or the like entering the magnetic shield 40 via 100 is suppressed from being applied to the magnetism collecting rings 31a and 31b.

Second Embodiment
Hereinafter, a second embodiment of the torque detection device will be described. Here, the difference from the first embodiment will be mainly described.

  As shown in FIG. 5, in the present embodiment, the magnetic shield 40 is not provided with the through hole 100, whereas the magnetic shield 40 is provided with two protrusions 101. The protrusion 101 protrudes radially inward at the center portion in the circumferential direction of the magnetic shield 40 and at both ends in the axial direction. The axial length of the portion of the magnetic shield 40 where the protrusion 101 is provided is longer than the axial length of the portion of the magnetic shield 40 where the protrusion 101 is not provided.

  Further, the concave portion 102 is formed in a portion corresponding to the protrusion 101 of the magnetic shield 40 in the first magnetic flux collecting holder 32a, that is, a portion on the opposite side to the extending direction of the substrate housing portion 34 in the circumferential direction of the first magnetic flux collecting holder 32a. Is provided. More specifically, the recess 102 is formed by cutting out a part of the flange portion 33a of the first ring portion 33 in the circumferential direction. Further, a recess 103 is provided in a portion on the opposite side of the circumferential direction of the second magnetism collecting holder 32b from the direction in which the substrate housing portion 36 extends. More specifically, the recess 103 is formed by cutting out a portion of the flange portion 35a of the second ring portion 35 in the circumferential direction.

The operation and effect of this embodiment will be described.
In the present embodiment, when the magnetic shield 40 is assembled to the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b, the concave portion 102 of the first magnetic flux collecting holder 32a and the concave portion 103 of the second magnetic flux collecting holder 32b. In addition, the protrusion 101 of the magnetic shield 40 is engaged. Even if the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b try to move away from each other, the concave portion 102 and the concave portion 103 are caught by the protrusion 101, respectively. Thereby, it is suppressed that the 1st magnetism collection holder 32a and the 2nd magnetism collection holder 32b leave | separate each other. For this reason, it is suppressed that the relative positional relationship of the 1st magnetism collection holder 32a, the 2nd magnetism collection holder 32b, and the magnetic shield 40 changes.

  In the present embodiment, the magnetic shield 40 may not be provided with a through hole. When it is strongly required to suppress the penetration of an external magnetic field into the magnetic shield 40, for example, when there are no open portions in the circumferential direction of the magnetic flux collecting rings 31a and 31b, a through hole is formed in the magnetic shield 40. As a result, it is possible to more reliably prevent magnetism from entering the inside of the magnetic shield 40 from the outside.

<Third Embodiment>
Hereinafter, a third embodiment of the torque detection device will be described. Here, the difference from the first embodiment will be mainly described.

  As shown in FIG. 6, in the present embodiment, the magnetic shield 40 is provided with a plurality of through holes 104 at regular intervals in the circumferential direction. Further, the through hole 104 is provided at an intermediate position in the axial direction of the magnetic shield 40.

  In addition, the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b are provided with a plurality of protrusions 111a and a plurality of protrusions 111b corresponding to the through holes 104 and spaced apart in the circumferential direction. It has been. Here, the protrusion 111a or the protrusion 111b is alternately provided in the part corresponding to the through-hole 104 in the 1st magnetism collection holder 32a and the 2nd magnetism collection holder 32b. That is, the protrusion 111a in the circumferential direction of the first magnetic flux collecting holder 32a is not provided with the protrusion 111b in the circumferential direction of the second magnetic flux collecting holder 32b, and is constant in the circumferential direction. Projections 111b are provided at positions spaced apart from each other.

The operation and effect of this embodiment will be described.
In the present embodiment, when the magnetic shield 40 is assembled to the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b, the projections 111a of the first magnetic flux collecting holder 32a are inserted into the plurality of through holes 104 of the magnetic shield 40. Or the protrusion 111b of the 2nd magnetism collection holder 32b engages. Even if the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b try to move away from each other, the protrusion 111a and the protrusion 111b are caught in the through hole 104. Thereby, it is suppressed that the 1st magnetism collection holder 32a and the 2nd magnetism collection holder 32b leave | separate each other. For this reason, it is suppressed that the relative positional relationship of the 1st magnetism collection holder 32a, the 2nd magnetism collection holder 32b, and the magnetic shield 40 changes.

  Further, by providing a plurality of through-holes 104, protrusions 111a, and protrusions 111b in the circumferential direction, the magnetic shield 40 can be further increased with respect to the first magnetism collecting holder 32a and the second magnetism collecting holder 32b. Fixed in place. Even if a plurality of through holes 104 are provided in the magnetic shield 40, if the influence on the magnetic flux collecting rings 31a and 31b is within an allowable range, the first magnetic flux collecting can be achieved by providing the through holes 104, the protrusions 111a, and the protrusions 111b. It is further suppressed that the relative positional relationship of the holder 32a, the second magnetic flux collecting holder 32b, and the magnetic shield 40 changes.

Each embodiment may be changed as follows. The following other embodiments can be combined with each other within a technically consistent range.
-In each embodiment, although Hall IC50 was employ | adopted as an element which detects a torque, it is not restricted to this. For example, an IC including an element for detecting magnetism, such as a magnetoresistive effect element and a magnetoimpedance element, may be employed as the element for detecting torque.

  In the first embodiment, the first magnetic flux collecting holder 32a is provided with the protrusion 110a, the second magnetic flux collecting holder 32b is provided with the protrusion 110b, and the magnetic shield 40 is provided with the through hole 100. Not exclusively. For example, a protrusion is provided on the inner peripheral surface of the magnetic shield 40, and the protrusion is between a through hole provided in the first magnetic flux collecting holder 32a and a through hole provided in the second magnetic flux collecting holder 32b. It may be inserted. Further, in order to fix the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b, a through hole provided in the first magnetic flux collecting holder 32a and a through hole provided in the second magnetic flux collecting holder 32b However, the protrusions provided on the same line as viewed from the radial direction and provided on the magnetic shield 40 may be inserted into the two through holes along the same line.

  -In 2nd Embodiment, although the length in the axial direction of the part in which the protrusion 101 was provided in the magnetic shield 40 was set longer than the length in the axial direction of the part in which the protrusion 101 in the magnetic shield 40 was not provided. , May be the same. In this case, the concave portion 102 is provided by cutting out a part in the circumferential direction of the flange portion 33a and the flange portion 35a, but the concave portion 102 is provided in a portion where the flange portion 33a is not provided in the first ring portion 33, The concave portion 102 may be provided in a portion of the second ring portion 35 where the flange portion 35a is not provided.

  -In 3rd Embodiment, although the protrusion 111a or the protrusion 111b was alternately provided in the part corresponding to the through-hole 104 in the 1st magnetism collection holder 32a and the 2nd magnetism collection holder 32b, it is not restricted to this. For example, a protrusion 110 formed by combining the protrusion 111a and the protrusion 111b may be provided at a portion corresponding to the through hole 104 in the first magnetic flux collecting holder 32a and the second magnetic flux collecting holder 32b.

  A protrusion (first protrusion) and a recess (first recess) may be provided on both the magnetism collecting holder 32 and the magnetic shield 40. Both the magnetic flux collecting holder 32 and the magnetic shield 40 are provided with a recess (second recess) and a protrusion (first protrusion) that engage with the protrusion and the recess so as to engage with the protrusion and the recess. May be. Even in this case, the relative movement of the first magnetic flux collecting holder 32a, the second magnetic flux collecting holder 32b, and the magnetic shield 40 can be suppressed. That is, at least one of a protrusion and a recess (through hole) is provided on at least one of the magnetism collecting holder 32 and the magnetic shield 40, and at least the other of the magnetism collecting holder 32 and the magnetic shield 40 is engaged with the protrusion and the recess. What is necessary is just to provide the recessed part and protrusion which do.

  In the first embodiment, the first magnetic flux collecting holder 32a, the second magnetic flux collecting holder 32b, and the protrusion 110a, the protrusion 110b, and the through hole 100 provided in the magnetic shield 40 are formed of the magnetic flux collecting rings 31a and 31b. However, the present invention is not limited to this. If the influence on the magnetic flux collecting rings 31a and 31b is acceptable, the magnetic flux collecting rings 31a and 31b may be provided at any position in the circumferential direction of the first magnetic flux collecting holder 32a, the second magnetic flux collecting holder 32b, and the magnetic shield 40. Similarly, in the second embodiment, the first magnetic flux collecting holder 32a, the second magnetic flux collecting holder 32b, and the protrusion 101 and the concave portion 102 provided on the magnetic shield 40 are open portions of the magnetic flux collecting rings 31a and 31b. Although provided corresponding to (locking part 39), it is not restricted to this.

  The cylindrical protrusion 110 configured by joining the cylindrical dividing surfaces of the protrusion 110a and the protrusion 110b to each other may be engaged with the through hole 100 of the magnetic shield 40 without any gap, or to the extent allowed. It may be inserted with a gap.

  -In 1st Embodiment, although the through-hole 100 was a hole which penetrated the radial direction of the magnetic shield 40, it is not restricted to this. Instead of the through hole 100, a recess that does not penetrate the magnetic shield 40 in the radial direction may be provided. That is, as a part of the magnetic shield 40, a through hole, a recess, or the like may be provided. Similarly, in the third embodiment, the through hole 104 may be a recess that does not penetrate.

  -In each embodiment, although the magnetism collection holder 32 was comprised by combining the 1st magnetism collection holder 32a and the 2nd magnetism collection holder 32b, it is not restricted to this. For example, the magnetism collecting holder 32 may be a combination of the first magnetism collecting holder 32a and the second magnetism collecting holder 32b. Even in this case, the relative movement between the magnetic shield 40 and the magnetic flux collecting holder 32 can be suppressed by inserting the protrusion provided in the magnetic flux collecting holder 32 into the through hole provided in the magnetic shield 40. it can.

  In each embodiment, the sensor device is embodied as the torque detection device 10 that detects torque, but is not limited thereto. For example, an angle sensor for obtaining the angles of the input shaft 20 and the output shaft 21 may be used.

  DESCRIPTION OF SYMBOLS 10 ... Torque sensor, 20 ... Input shaft, 21 ... Output shaft, 22 ... Torsion bar, 23 ... Permanent magnet, 24 ... Yoke, 24a, 24b ... Magnetic yoke, 25 ... Annular part, 25a ... Claw, 26 ... Synthetic resin body , 30 ... Magnetic collecting unit, 31a, 31b ... Magnetic collecting ring, 32 ... Magnetic collecting holder, 32a ... First magnetic collecting holder, 32b ... Second magnetic collecting holder, 33 ... First ring portion, 33a ... Flange 34, substrate housing portion, 35 ... second ring portion, 35a ... flange portion, 36 ... substrate housing portion, 37 ... engagement projection, 38 ... recess, 40 ... magnetic shield, 50 ... Hall IC, 51 ... cord , 60, 61 鍔, 60 a, 61 a, guide groove, 62, partition wall, 63, flange portion, 100, through hole (part, recess), 101, projection, 102, 103, recess, 104, through hole (part, Recess), 11 , 110a, 110b ... projections.

Claims (6)

With permanent magnets,
A magnetic yoke disposed in a magnetic field formed by the permanent magnet and changing a relative position with the permanent magnet;
A cylindrical magnetism collecting holder disposed so as to surround the magnetic yoke, a magnetism collecting ring attached to the inner circumferential surface of the magnetism collecting holder and collecting the magnetic flux of the magnetic yoke, and fitted to the outer circumferential surface of the magnetism collecting holder A cylindrical magnetism collecting unit having a magnetic shield attached together;
In the sensor device comprising the permanent magnet, the magnetic yoke, and a magnetic sensor for detecting a magnetic flux of a magnetic circuit formed by the magnetism collecting ring,
A sensor device in which a part of the magnetic flux collecting holder and a part of the magnetic shield are fitted to each other in order to suppress relative movement of the magnetic flux collecting holder and the magnetic shield. The sensor device according to claim 1,
At least one of the first protrusion and the first recess is provided as at least one of the magnetic flux collecting holder and the magnetic shield,
A sensor in which at least one of the magnetic flux collecting holder and the magnetic shield is provided with at least one of a second recess that fits in the first projection and a second projection that fits in the first recess as the part. apparatus. The sensor device according to claim 2,
The magnetic flux collecting holder is formed by assembling the first magnetic flux collecting holder and the second magnetic flux collecting holder that are divided in the axial direction,
The first magnetic flux collecting holder and the second magnetic flux collecting holder are each provided with the first protrusion, the magnetic shield is provided with the second recess, and the first magnetic flux collecting holder The first protrusion and the first protrusion of the second magnetism collecting holder are inserted into the second recess. The sensor device according to claim 3,
The first protrusion is divided into two along the mating surfaces of the first magnetic flux collecting holder and the second magnetic flux collecting holder,
Inserted into the second recess of the magnetic shield in a state where the divided first protrusion on the first magnetic flux collecting holder side and the divided first protrusion on the second magnetic flux collecting holder side are combined. Sensor device. In the sensor apparatus as described in any one of Claims 2-4,
The sensor device, wherein the first protrusion, the first recess, the second protrusion, and the second recess are provided in a portion corresponding to an open portion in a circumferential direction of the magnetism collecting ring. In the sensor apparatus as described in any one of Claims 2-5,
A sensor device in which at least one of the first protrusion and the second recess, and the second protrusion and the first recess is provided in the circumferential direction of the magnetism collecting ring.

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