JP6134350B2 - Torque detection device - Google Patents

Description

  The present invention provides a multipolar magnet formed in a ring shape and fixed to a first shaft, a yoke holder fixed to a second shaft coaxially connected to the first shaft via a torsion bar, and the magnet A pair of magnetic yokes each having a plurality of opposing claw portions and fixed to the yoke holder, and press-fitting into a case corresponding to each of the magnetic yokes and at a fixed position with respect to the first shaft and the second shaft The present invention relates to a torque detection device including a pair of magnetic flux collecting terminals and a sensor unit that has a magnetic detection element disposed between the magnetic flux collecting terminals and detects a rotational phase difference between first and second shafts.

  A torque detection device used for a power steering device of a vehicle is known from Patent Document 1, in which a sensor unit includes a pair of magnetic flux collecting terminals press-fitted into a fixed case, and between those magnetic flux collecting terminals. It is comprised so that the magnetic detection element arrange | positioned may be provided.

JP 2013-195333 A

  By the way, it is desired to prevent deformation of the magnetism collecting terminals when the pair of magnetism collecting terminals provided in the sensor unit is press-fitted into the case by the press-fitting jig.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a torque detection device that prevents deformation of the magnetism collecting terminal when the magnetism collecting terminal is press-fitted into the case.

  In order to achieve the above object, the present invention is a ring-shaped multipolar magnet fixed to the first shaft and a second shaft fixedly connected to the first shaft via a torsion bar. Yoke yoke holder, a pair of magnetic yokes each having a plurality of claw portions opposed to the magnet and fixed to the yoke holder, and the first and second shafts individually corresponding to the magnetic yokes Sensor unit having a pair of magnetism collecting terminals press-fitted into a case at a fixed position with respect to the magnetism and a magnetic detection element arranged between the magnetism collecting terminals, and detecting a rotational phase difference between the first and second axes The first feature is that a pair of press-fitting pieces each having a bent portion facing the press-fitting direction so as to be pressed by a press-fitting jig are provided on the magnetism collecting terminal.

  According to the present invention, in addition to the configuration of the first feature, the case has a press-fitting hole for press-fitting the press-fitting piece and is formed of a synthetic resin, and the press-fitting piece of the metal magnetism collecting terminal The second feature is that a plurality of engaging claws that engage with the inner surface of the press-fitting hole are integrally provided.

  Furthermore, in addition to the configuration of the second feature, the present invention provides the press-fitting piece on one of two surfaces sandwiching the press-fitting piece from both sides in the thickness direction of the inner surface of the press-fitting hole having a rectangular cross-sectional shape. A third feature is that a rib that presses the other side of the two surfaces protrudes in a direction along the press-fitting direction.

  According to the first feature of the present invention, the bent portion facing the press-fitting direction is provided on the press-fitting piece provided on the magnetic collecting terminal so as to be press-fitted into the case, so that the press-fitting jig is pressed. It is possible to prevent deformation of the magnetic flux collecting terminals during press-fitting with the press-fitting jig.

  Further, according to the second feature of the present invention, the plurality of engaging claws that engage with the inner surface of the press-fitting hole provided in the case made of synthetic resin are integrally provided on the press-fitting piece. In this state, the magnetic flux collecting terminal can be securely fixed to the case.

  Furthermore, according to the third feature of the present invention, a rib extending in the press-fitting direction is protruded on one of two surfaces sandwiching the press-fitting piece from both sides in the plate thickness direction of the inner surface of the press-fitting hole, Since the rib is pressed against the other of the two surfaces, the press-fitting piece in the press-fitting hole can be prevented from rattling and the magnetic flux collecting terminal can be securely fixed to the case.

It is a longitudinal cross-sectional view of a 1st axis | shaft, a 2nd axis | shaft, a torsion bar, and a torque detection apparatus. It is a disassembled perspective view of a torque detection apparatus. It is a perspective view of a magnet part. FIG. 4 is an enlarged view of a part indicated by an arrow 4 in FIG. 1. It is a side view of a stator part. It is a perspective view of a yoke holder. It is a longitudinal cross-sectional view which shows the state at the time of caulking and fixing a magnetic yoke to a yoke holder sequentially. It is the front view which looked at the sensor part from the stator part side. It is sectional drawing which follows the 9-9 line | wire of FIG. It is a perspective view of a magnetism collecting terminal. It is a longitudinal cross-sectional view which shows sequentially the state at the time of pressing-in a magnetism collecting terminal in a case seeing from the same direction as FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 11 of the accompanying drawings. First, in FIG. 1, in an electric power steering apparatus, a middle portion of a steering shaft is connected by a torsion bar 17. A torque detector is provided that is configured in accordance with the present invention to detect torsion between the single shaft 15 and the second shaft 16.

  The end of the first shaft 15 on the second shaft 16 side and the end of the second shaft 16 on the first shaft 15 side are each formed in a cylindrical shape, and the first shaft 15 is closer to the second shaft 16. The flange 15 projecting outward in the radial direction from the outer periphery of the intermediate portion thereof, and the flange 15a has a smaller outer diameter than the portion opposite to the second shaft 16 with respect to the flange 15a, and is closer to the second shaft 16 than the flange 15a. And a small-diameter cylindrical portion 15b disposed in the portion. A portion of the second shaft 16 on the first shaft 15 side is disposed so as to surround the small-diameter cylindrical portion 15b of the first shaft 15.

  Referring also to FIG. 2, the torque detector includes a magnet portion 18 fixed to the first shaft 15, a stator portion 19 fixed to the second shaft 16, the first shaft 15 and the second shaft 16. And a sensor unit 20 for detecting a rotational phase difference between the magnet unit 18 and the stator unit 19.

  Referring also to FIG. 3, the magnet portion 18 is formed in a ring shape surrounding the magnet holder 22 and a metal magnet holder 22 that is fixed to the first shaft 15 by press fitting and formed in a cylindrical shape. And a magnet 23 that is fixed to the magnet holder 22, and the magnet 23 is a multipolar one in which a plurality of, for example, 8 N poles and S poles are alternately arranged in the circumferential direction. is there.

  A flange portion 22a that projects outward in the radial direction is integrally provided at one end of the magnet holder 22, and the magnet holder 22 makes the flange portion 22a contact the flange portion 15a of the first shaft 15. In this way, it is press-fitted into the first shaft 15. The magnet 23 is adhered to the outer periphery of the magnet holder 22 with an adhesive so that one end thereof is brought into contact with the flange portion 22a.

  In addition, positioning recesses 24 are formed at, for example, two locations along the circumferential direction of the flange portion 22a, and a positioning projection 23a that engages with the positioning recess 24 protrudes from one end of the magnet 23. . In addition, a substantially U-shaped notch 25 opened to the opposite side to the flange portion 22a is formed at one location along the circumferential direction of the magnet holder 22 so as to cut and raise the cut piece 22b. The cut-and-raised piece 22b can be brought into contact with the magnet 23 bonded to the outer periphery of the magnet holder 22 from the side opposite to the flange portion 22a.

  4 to 6, the stator portion 19 includes a yoke holder 27 made of a synthetic resin, a collar 28 that is formed in a ring shape with metal and is mold-coupled to the yoke holder 27, and the yoke holder 27. The first and second magnetic yokes 29 and 30 are fixed to each other.

  The yoke holder 27 surrounds the first cylindrical portion 27a surrounding the first shaft 15 side end portion of the second shaft 16, and has a larger diameter than the first cylindrical portion 27a, and surrounds the magnet 23. The cylindrical portion 27b and a ring-shaped connecting portion 27c for connecting the first and second cylindrical portions 27a and 27b are integrally formed, and the collar 28 is formed in the first cylindrical portion 27a. The collar 28 is mold-bonded to the periphery, and the collar 28 is press-fitted into the outer periphery of the end of the second shaft 16 on the first shaft 15 side.

  The first magnetic yoke 29 includes a plurality of, for example, eight claw portions 29a disposed on the inner peripheral side of the second cylindrical portion 27b so as to face the outer periphery of the magnet 23, and the claw portions thereof. 29a is formed so as to integrally have a ring plate portion 29b continuously provided at a plurality of locations, for example, eight locations, spaced at equal intervals in the circumferential direction at right angles to the inner periphery. The second magnetic yoke 30 includes a plurality of, for example, eight claw portions 30a disposed on the inner peripheral side of the second cylindrical portion 27b so as to face the outer periphery of the magnet 23, and the claws thereof. The part 30a is formed so as to integrally have a ring plate part 30b continuously provided at a plurality of positions at equal intervals in the circumferential direction, for example, at eight positions at right angles to the inner periphery.

  The ring plate portion 29b of the first magnetic yoke 29 is bonded to the ring-shaped first bonding surface 31 formed at one end of the second cylindrical portion 27b of the yoke holder 27 with an adhesive 33, and the second magnetic yoke 29 is bonded to the second magnetic portion. The ring plate portion 30 b of the yoke 30 is bonded to a ring-shaped second bonding surface 32 formed at the other end of the second cylindrical portion 27 b in the yoke holder 27 with an adhesive 34.

  With the first and second magnetic yokes 29, 30 fixed to the second cylindrical portion 27 b of the yoke holder 27, the claw portion 29 a of the first magnetic yoke 29 and the claw portion of the second magnetic yoke 30 30a is alternately arranged in the circumferential direction, and the total number of the claw portions 29a, 30a is set corresponding to the total number of N poles and S poles in 23 of the magnet.

  By the way, as shown in FIG. 6, the ring-shaped second bonding surface 32 provided on the second cylindrical portion 27 b of the yoke holder 27 so as to bond the ring plate portion 30 b of the second magnetic yoke 30. In this embodiment, the recess 36 has a plurality of protrusions 32 a arranged at intervals in the circumferential direction at a portion near the outer periphery of the second adhesive surface 32. Formed to occur. The ring-shaped first bonding surface 31 provided on the second cylindrical portion 27b of the yoke holder 27 so as to bond the ring plate portion 29b of the first magnetic yoke 29 has a recess similar to the recess 36. 35 is formed, and the recess 35 is formed such that a plurality of protrusions 31 a arranged at intervals in the circumferential direction are formed by the recess 35 at a portion near the outer periphery of the first bonding surface 31.

  As clearly shown in FIG. 4, adhesives 33 and 34 can be stored in the concave portion 35 of the first adhesive surface 31 and the concave portion 36 of the second adhesive surface 32.

  Incidentally, the first and second magnetic yokes 29 and 30 are bonded to the second cylindrical portion 27b of the yoke holder 27 and fixed by caulking to the outer periphery of the second cylindrical portion 27b. A plurality of, for example, four caulking pieces 29c and 30c, which are caulked so as to engage with a locking groove 37 provided in the axially intermediate portion of the outer circumference of the cylindrical portion 27b, are arranged on the outer circumference of the ring plate portions 29b and 30b. The first and second magnetic yokes 29 and 30 are integrally provided so as to extend at right angles and extend along the outer periphery of the second cylindrical portion 27b.

  The caulking piece 29c of the first magnetic yoke 29 is disposed at a position where it wraps in a radial direction of the second cylindrical portion 27b on a specific claw portion 29a selected from the claw portions 29a of the first magnetic yoke 29. In this embodiment, four caulking pieces 29c having a width narrower than that of the claw portions 29a are provided to the four specific claw portions 29a that are equally spaced from each other, and the second cylindrical portion. It arrange | positions so that the center position along the circumferential direction of 27b may correspond.

  The second caulking piece 20c of the second magnetic yoke 30 is a position where the second caulking portion 30a of the second magnetic yoke 30 wraps in a radial direction of the second cylindrical portion 27b on a specific claw portion 30a selected. In this embodiment, four caulking pieces 30c having a width narrower than that of the claw portion 30a are connected to the four specific claw portions 30a that are equally spaced from each other. It arrange | positions so that the center position along the circumferential direction of the cylindrical part 27b may correspond.

  By the way, the position where the caulking piece 29c of the first magnetic yoke 29 wraps in the radial direction of the second cylindrical portion 27b on the four specific claw portions 29a spaced apart from each other among the eight claw portions 29a. Of four claw portions 30c of the second magnetic yoke 30 that are spaced apart from each other among the eight claw portions 30a that are alternately arranged in the circumferential direction with the claw portions 29a. Since the second caulking pieces 29c and 30c are alternately arranged in the circumferential direction of the second cylindrical portion 27b, the caulking pieces 29c and 30c are arranged in the circumferential direction of the second cylindrical portion 27b. .

  In FIG. 7, when the first and second magnetic yokes 29 and 30 are fixed by caulking to the yoke holder 27, a receiving jig 39 that fits into the yoke holder 27 and receives the yoke holder 27, and the yoke holder 27. A plurality of caulking blades 40 disposed on the outer side of the second cylindrical portion 27b, a return spring 41 provided between the receiving jig 39 and the caulking blades 40, and the yoke holder 27 on the opposite side. A caulking device including a pressing roller 42 that is driven by a cylinder (not shown) or the like in the axial direction of the yoke holder 27 while being in contact with an inclined cam surface 43 formed on the outer surface of the caulking blade 40 is used.

  By the way, the caulking pieces 29c, 30c of the first and second magnetic yokes 29, 30 are alternately arranged in the circumferential direction of the second cylindrical portion 27b, but they are mutually arranged in the circumferential direction of the second cylindrical portion 27b. Adjacent pairs of caulking pieces 29c, 30c are arranged at positions where they are simultaneously caulked by the same caulking blade 40.

  Therefore, in the caulking device, the caulking blades 40 are arranged at four locations at equal intervals in the circumferential direction of the second cylindrical portion 27b corresponding to four sets of caulking pieces 29c and 30c. The press caulking portions 40a that the caulking blades 40 have in the portions corresponding to the locking grooves 37 of the second cylindrical portion 27b are caulked adjacent to each other in the circumferential direction of the second cylindrical portion 27b. It forms so that the piece 29c, 30c can be crimped simultaneously.

  With the yoke holder 27 in a state where the first and second magnetic yokes 29 and 30 are bonded supported by the receiving jig 39, the pressing roller 42 is moved from the position of FIG. 7A to FIG. 7B. The caulking blades 40 are moved forward to the yoke holder 27 side against the spring force of the return spring 41, and are caulked pieces 29c and 30c adjacent to each other in the circumferential direction of the second cylindrical portion 27b. Are simultaneously caulked so as to engage with the locking groove 37 by the press caulking portion 40 a of the caulking blade 40.

  Referring to FIGS. 8 and 9 together, the sensor section 20 includes a synthetic resin case 45 in a fixed position with respect to the first shaft 15 and the second shaft 16, and first and second magnetic yokes. 29 and 30 are disposed between the first and second magnetic current collecting terminals 46 and 47 and the first and second magnetic current collecting terminals 46 and 47 which are press-fitted into the case 45 individually. Hall IC 48 as a magnetic detection element.

  The case 45 is fixedly disposed outward in the radial direction of the stator portion 19, and is a direction orthogonal to the axes of the first shaft 15 and the second shaft 16 while opening a tip portion on the stator portion 19 side. A case main portion 45a having a long oval cross-sectional shape and formed in a cylindrical shape, a mounting flange portion 45b projecting laterally from the base end of the case main portion 45a, the first shaft 15 and the first A connector portion 45c that extends in a direction along the axis of the biaxial shaft 16 and that is connected to the base end portion of the case main portion 45a at a right angle is integrally formed. In addition, a pair of cylindrical collars 49 (see FIG. 2) for inserting a bolt for fastening the case 45 to the vehicle body side are mold-coupled to the mounting flange 45b.

  In FIG. 10, the first magnetic collecting terminal 46 is an arc formed in an arc shape so as to face the ring plate portion 29 b of the first magnetic yoke 29 from the outside in the axial direction of the first shaft 15 and the second shaft 16. A plate portion 46a, a pair of magnetic flux collecting pieces 46b protruding in parallel to each other from the circumferential central portion of the circular arc plate portion 46a, and the circular arc plate portions on both sides in the circumferential direction of the magnetic flux collecting pieces 46b 46a and a pair of press-fit pieces 46c projecting outward in parallel with the magnetism collecting piece 46b, and parallel to the magnetism collecting piece 46b and the press-fit piece 46c from both circumferential ends of the circular arc plate portion 46a. A pair of guide pieces 46d projecting outward is integrally formed.

  Incidentally, the first magnetic flux collecting terminal 46 is fixed to the case main portion 45a of the case 45 by press fitting, and the magnetic flux collecting piece 46b, the press fitting piece 46c, and the guide piece 46d are the first magnetic flux collecting terminals. The terminal 46 is integrally connected to the circular arc plate portion 46a so as to extend in parallel along the press-fitting direction 50 into the case main portion 45a.

  The second magnetism collecting terminal 47 is formed so as to have a shape symmetrical to the first magnetism collecting terminal 46 with respect to a plane orthogonal to the axial direction of the first and second shafts 15, 16. A portion 47a, a pair of magnetism collecting pieces 47b, a pair of press-fitting pieces 47c, and a pair of guide pieces 47d are integrally formed.

  An IC substrate 51 is disposed inside the case portion 45a so as to insert a pair of support protrusions 52 provided integrally with the case main portion 45a, and a part of the support protrusions 52 is provided. The IC substrate 51 is fixed to the case main portion 45a. The IC substrate 51 is provided with a pair of the Hall elements 48.

  The case 45 is formed by molding a plurality of bus bars 54 having one end portion disposed in the connector portion 45c and the other end portion being connected to the IC substrate 51 in a bus bar holder 55 made of synthetic resin. The bus bar unit 53 is mold-coupled so as to extend between the case main part 45a and the connector part 45c.

  The pair of Hall ICs 48 is disposed between the tip end portions of the pair of magnetism collecting pieces 46 b included in the first magnetism collecting terminal 46 and the tip end portions of the pair of magnetism collecting pieces 47 b included in the second magnetism collecting terminal 47. The magnetic collecting pieces 46b and 47b of the first and second magnetic collecting terminals 46 and 47 are formed by press-fitting and fixing the first and second magnetic collecting terminals 46 and 47 to the case 45. In this state, the tip portions are bent so as to be close to each other.

  Two pairs of pairs for press-fitting a pair of press-fitting pieces 46c provided in the first magnetic collecting terminal 46 and a pair of press-fitting pieces 47c provided in the second magnetic collecting terminal 47 into the case main portion 45a of the case 45. The press-fitting holes 56, 57 are provided, and a plurality of engaging claws 58 that engage with the inner surface of the press-fitting hole 56 for press-fitting the press-fitting piece 46c are provided integrally with the press-fitting piece 46c. Then, a plurality of the engaging claws 58 are provided on both sides in the width direction of the press-fitting piece 46c. The press-fitting piece 47c of the second magnetism collecting terminal 47 is also integrally provided with a plurality of engaging claws that engage with the inner surface of the press-fitting hole 57, although not shown.

  The press-fitting holes 56 and 57 are formed to have a rectangular cross-sectional shape, and two press-fitting pieces 46c and 47c are sandwiched from both sides in the plate thickness direction among the inner surfaces of the press-fitting holes 56 and 57. On the other hand, ribs 60 and 61 for pressing the press-fitting pieces 46c and 47c to the other side of the two surfaces are provided so as to extend along the press-fitting direction 50.

  By the way, the press-fitting pieces 46c and 47c of the first and second magnetic flux collecting terminals 46 and 47 are press-fitted into the press-fitting holes 56 and 57 by being pressed in the press-fitting direction 50 by a press-fitting jig 64 as shown in FIG. The press-fitting pieces 46c and 47c are provided with bent portions 65 and 66 facing the press-fitting direction 50 so as to be pressed by the press-fitting jig 64.

  That is, as shown in FIG. 11A, after a part of the first and second magnetic flux collecting terminals 46 and 47 is inserted into the case main portion 45a, as shown in FIG. By pressing the tool 64 against the bent portions 65 and 66 and pressing in the press-fitting direction 50, the press-fitting pieces 46c and 47c are press-fitted into the press-fitting holes 56 and 57, and the first and second magnetic collecting terminals 46 and 47 are connected. It will be fixed to the case 45.

  Further, the case main portion 45 a is provided with guide recesses 67 and 68 for guiding the guide pieces 46 d and 47 d of the first and second magnetic flux collecting terminals 46 and 47. The first and second magnetic flux collecting terminals 46 and 47 are reliably guided along the press-fitting direction 50. Moreover, the guide pieces 46d and 47d are connected to both ends in the circumferential direction of the arc plate portions 46a and 47a of the first and second magnetic flux collecting terminals 46 and 47, and the circumferential direction of the arc plate portions 46a and 47a. Both end portions are supported by the case main portion 45a, and the arc plate portions 46a and 47a can be prevented from warping.

  After the first and second magnetic flux collecting terminals 46 and 47 are press-fitted and fixed to the case 45, the press-fitting holes 56 and 57 are filled with an adhesive, and the case main part 45a has As shown in FIG. 1, a potting agent 69 is filled.

  Next, the operation of this embodiment will be described. The first and second magnetic yokes 29 and 30 are bonded to the yoke holder 27 on the second shaft 16 coaxially connected to the first shaft 15 via the torsion bar 17. The first and second adhesive surfaces 31 and 32 are provided, and the first and second adhesive surfaces 31 and 32 are formed with recesses 35 and 36 that can store the adhesives 33 and 34, respectively. The first and second magnetic yokes 29 and 30 can be securely bonded to the yoke holder 27 by accumulating an adhesive in the recesses 35 and 36.

  The yoke holder 27 is formed to have a second cylindrical portion 27b surrounding the ring-shaped magnet 23 fixed to the first shaft 15, and the first and second magnetic yokes 29 and 30 are formed as second A plurality of claw portions 29a and 30a facing the magnet 23 inside the cylindrical portion 27b are respectively fixed to the yoke holder 27, and a plurality of caulking pieces are caulked on the outer periphery of the second cylindrical portion 27b. 29c and 30c are provided on the first and second magnetic yokes 29 and 30, respectively, and the caulking pieces 29c and 30c are selected from the plurality of claw portions 29a and 30a. Since the second cylindrical portion 27b is disposed at a position where the second cylindrical portion 27b wraps in the radial direction and has a narrower width than the claw portions 29a, 30a, the caulking pieces 29c, The inner peripheral side of the claw portion 29a of the yoke holder 27 during crimping of 0c, the claw portion 29a by the receive 30a with receptacle 39, that deformation to 30a can be prevented.

  Further, since the caulking pieces 29c and 30c are arranged so that the center position along the circumferential direction of the second cylindrical portion 27b coincides with the specific claw portions 29a and 30a, the magnetic yokes 29 and 30 are used during caulking. Among them, the stress applied to the portion without the claw portions 29a, 30a in the circumferential direction can be minimized, and deformation of the portion can be prevented.

  The claw portions 29a, 30a of the first and second magnetic yokes 29, 30 are alternately arranged in the circumferential direction of the second cylindrical portion 27b, and are adjacent to each other in the circumferential direction of the second cylindrical portion 27b. Since the nail | claw parts 29a and 30a which comprise are arrange | positioned in the position caulked simultaneously with the same caulking blade 40, productivity can be improved. In addition, in this embodiment, a caulking device having caulking blades 40 disposed at four positions spaced equally in the circumferential direction of the second cylindrical portion 27b corresponding to four sets of caulking pieces 29c and 30c one by one. Caulking is performed simultaneously from four directions, and productivity can be further increased.

  The sensor unit 20 that detects the rotational phase difference between the first shaft 15 and the second shaft 16 includes first and second magnetic flux collecting terminals 46 and 47 that are press-fitted into the case 45 at a fixed position, and the magnetic flux collectors thereof. The Hall IC 48 disposed between the terminals 46 and 47 is bent so as to be opposed to the press-fitting direction 50 so as to be pressed against the first and second magnetic collecting terminals 46 and 47 by the press-fitting jig 64. Since the pair of press-fitting pieces 46c and 47c having the portions 65 and 66 are respectively provided, it is possible to prevent the first and second magnetic flux collecting terminals 46 and 47 from being deformed during press-fitting by the press-fitting jig 64.

  The case 45 has a press-fitting hole 56, 57 for press-fitting the press-fitting pieces 46c, 47c, is formed of a synthetic resin, and the press-fitting of the first and second magnetic flux collecting terminals 46, 47 made of metal. Since the plurality of engaging claws 58 that engage with the inner surfaces of the press-fit holes 56, 57 are integrally provided on the pieces 46c, 47c, the first press-fit pieces 46c, 47c are press-fit into the press-fit holes 56, 57. In addition, the second magnetic flux collecting terminals 46 and 47 can be securely fixed to the case 45.

  Further, of the inner surfaces of the press-fitting holes 56 and 57 having a rectangular cross-sectional shape, the press-fitting pieces 46c and 47c are arranged on one of the two surfaces sandwiching the press-fitting pieces 46c and 47c from both sides in the plate thickness direction. Since the ribs 60 and 61 that press to the other side protrude in a direction along the press-fitting direction 50, the press-fitting pieces 46c and 47c in the press-fitting holes 56 and 57 are free from rattling. The first and second magnetic flux collecting terminals 46 and 47 can be securely fixed to the case 45.

  Further, a ring-shaped magnet 23 surrounding the magnet holder 22 is bonded to the outer periphery of a cylindrical magnet holder 22 fixed to the first shaft 15. The magnet holder 22 is radially attached to one end thereof. An outwardly extending flange portion 22a is integrally provided so as to abut one end portion of the magnet 23, and is protruded from the one end portion of the magnet 23 into a positioning recess 24 formed in the flange portion 22a. Since the positioning projection 23a is engaged, the circumferential direction of the magnet 23 with respect to the magnet holder 22 is fixed, and the cut-and-raised piece 22b that can come into contact with the magnet 23 from the side opposite to the flange portion 22a is a magnet holder. The axial position of the magnet 23 with respect to the magnet holder 22 is constant. It is determined. Accordingly, even if the adhesion state of the magnet 23 to the outer periphery of the magnet holder 22 is released, the circumferential direction and the axial position of the magnet 23 with respect to the magnet holder 22 are held constant, and the magnet 23 to the magnet holder 22 is maintained. Can be securely fixed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

15 ... first shaft 16 ... second shaft 17 ... torsion bar 20 ... sensor portion 23 ... magnet 27 ... yoke holders 29, 30 ... magnetic yokes 29a, 30a ... Claw portion 45... Cases 46 and 47... Magnetic collecting terminals 46 c and 47 c.
56, 57 ... press-fitting hole 58 ... engagement claw 60, 61 ... rib 64 ... press-fitting jig 65, 66 ... bent portion

Claims (3)

  A multipolar magnet (23) formed in a ring shape and fixed to the first shaft (15), and a second shaft (16) coaxially connected to the first shaft (15) via a torsion bar (17). ) And a pair of magnetic yokes (29, 30) each having a plurality of claw portions (29a, 30a) facing the magnet (23) and fixed to the yoke holder (27). And a pair of magnetic flux collectors that are press-fitted into a case (45) that individually corresponds to the magnetic yokes (29, 30) and is fixed to the first shaft (15) and the second shaft (16). It has a terminal (46, 47) and a magnetic detection element (48) arranged between the magnetic collecting terminals (46, 47), and the rotational phase difference between the first axis (15) and the second axis (16). Torque provided with a sensor part (20) for detection In the output device, a pair of press-fitting pieces (65, 66) having bent portions (65, 66) facing the press-fitting direction (50) so as to be pressed by the press-fitting jig (64) to the magnetic collecting terminals (46, 47). 46c, 47c) are provided, respectively.   The case (45) has a press-fitting hole (56, 57) for press-fitting the press-fitting piece (46c, 47c), is formed of a synthetic resin, and the metal magnetism collecting terminal (46, 47). The torque detection according to claim 1, wherein the press-fitting pieces (46c, 47c) are integrally provided with a plurality of engaging claws (58) that engage with inner surfaces of the press-fitting holes (56, 57). apparatus.   Of the inner surfaces of the press-fitting holes (56, 57) having a rectangular cross-sectional shape, the press-fitting pieces (46c, 47c) are arranged on one of two surfaces sandwiching the press-fitting pieces (46c, 47c) from both sides in the plate thickness direction. The torque detecting device according to claim 2, wherein a rib (60, 61) that presses the other side of the two surfaces protrudes in a direction along the press-fitting direction (50). .

Images