JP2012244851A - Rotation detection device and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation detection device capable of making a holding member hold a sensor magnet with ease.SOLUTION: A contact part 54 contacting with a first end surface 43a in an axial direction of an annular sensor magnet 43, and an elastic extended part 57 extended from the contact part 54 through an inner peripheral side of the sensor magnet 43 in the axial direction and being elastically deformable in a radial direction, are provided to a holding member 51. An engaging projection part 57b extended in the radial direction and engaged with a second end surface 43b of the sensor magnet 43 is provided to the elastic extended part 57. The sensor magnet 43 is supported by the contact part 54 and the engaging projection part 57b from both sides in the axial direction.

Description

  The present invention relates to a rotation detection device and a motor.

  Conventionally, a motor used in a power window device, an electric sunroof device, or the like is provided with a rotation sensor that detects the rotation state of the rotation shaft of the motor in order to prevent foreign matter from being caught between the moving body and the window frame. Yes. This rotation sensor is composed of a sensor magnet held so as to be able to rotate integrally with a rotation shaft via a holding member, and a detection element such as a Hall IC arranged on a fixed body.

  Here, the sensor magnet is fixed to the rotating shaft, for example, as disclosed in Patent Document 1, a method of heat caulking a holding member (a part of a driving side rotating body of a joint that rotates integrally with the rotating shaft) For example, as disclosed in Patent Document 2, a method is known in which a sensor magnet is insert-molded and embedded in the holding member.

JP 2002-34207 A JP-A-2005-160161

  However, in the sensor magnet fixing structure as in Patent Document 1 and Patent Document 2, a dedicated facility for fixing the sensor magnet to the holding member is required, and further, the assembly work and the molding work itself are complicated. It was.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotation detection device and a motor capable of easily holding a sensor magnet with respect to a holding member.

  In order to solve the above-mentioned problem, the invention according to claim 1 is provided with a sensor magnet that is held so as to be integrally rotatable with respect to the rotating shaft via a holding member, and from a detection element that is arranged to face the sensor magnet. In the rotation detection device that detects the rotation state of the rotation shaft based on a detection signal, the sensor magnet has an annular shape centered on the rotation shaft, and is assembled to the holding member from the axial direction of the rotation shaft. The holding member includes an abutting portion that abuts on one end surface in the axial direction of the sensor magnet, and an axial direction of the rotary shaft from the abutting portion through an inner peripheral side or an outer peripheral side of the sensor magnet. And an elastic extension portion that is elastically deformable in the radial direction, and is engaged with the elastic extension portion that extends in the radial direction and engages with the other axial end surface of the sensor magnet. Convex It is provided, wherein the sensor magnet is characterized by being supported from both axial sides the contact part by the said engaging protrusion.

  According to the present invention, when the sensor magnet is assembled to the holding member from the axial direction, the elastic extending portion in contact with the sensor magnet is elastically deformed in the radial direction so as to avoid the sensor magnet. When the sensor magnet is pushed in until the one end surface in the axial direction of the sensor magnet comes into contact with the contact portion of the holding member, the engaging convex portion engages with the other end surface in the axial direction of the sensor magnet by the elastic return of the elastic extension portion. That is, the sensor magnet can be held by the holding member in a state in which the movement in the axial direction is restricted only by assembling the sensor magnet with respect to the holding member so that the axial end surface of the sensor magnet abuts against the contact portion. As a result, the sensor magnet can be easily held by the holding member.

  According to a second aspect of the present invention, in the rotation detection device according to the first aspect, the holding member includes a shaft portion that is in contact with an inner peripheral surface of the sensor magnet and maintains a coaxial state with the sensor magnet. It is characterized by having.

In this invention, it becomes possible to maintain the coaxial state of a holding member and a sensor magnet suitably by the axial part which contact | connects the inner peripheral surface of a sensor magnet.
According to a third aspect of the present invention, in the rotation detection device according to the second aspect, the elastic extension portion is provided on an inner peripheral side of the sensor magnet, and a diameter between the elastic extension portion and the shaft portion. Between the directions, an elastic allowing portion for allowing elastic deformation of the elastic extending portion is formed.

  In the present invention, the shaft portion and the elastic extension portion can be laid out on the inner peripheral side of the sensor magnet. In addition, if the dimension of the elastic permissible portion is set to the minimum dimension that allows for the amount of elastic deformation in the radial direction of the elastic extension portion, the elastic extension portion can be disposed closer to the shaft portion, This contributes to downsizing and consequently downsizing of the holding member.

  According to a fourth aspect of the present invention, in the rotation detection device according to the third aspect, the shaft portion is provided with a rotation stop portion that engages with the sensor magnet in the rotation direction. It is formed in the position different from the said elastic extension part in a direction.

In this invention, since the rotation stopper is formed at a position different from the elastic extension in the circumferential direction, the degree of freedom in designing the rotation stopper can be improved.
According to a fifth aspect of the present invention, in the rotation detection device according to any one of the first to fourth aspects, a plurality of the elastic extension portions are provided at equal intervals in the circumferential direction.

In the present invention, since the plurality of elastic extending portions are provided at equal intervals in the circumferential direction, the sensor magnet can be held in a well-balanced manner.
The invention according to claim 6 is the rotation detection device according to any one of claims 1 to 5, wherein the holding member has a wall portion that covers at least a part of the outer peripheral surface of the sensor magnet. It is characterized by being.

  In this invention, since at least a part of the outer peripheral surface of the sensor magnet is covered with the wall portion, for example, when the sensor magnet is cracked, it is possible to prevent the piece from falling off from the holding member in the radial direction. Can do.

A seventh aspect of the present invention is a motor including the rotation detection device according to any one of the first to sixth aspects.
In the present invention, a motor capable of easily holding the sensor magnet with respect to the holding member can be provided.

  Therefore, according to the above-described invention, the sensor magnet can be easily held by the holding member.

Sectional drawing of the motor of this embodiment. The perspective view of a holding member and a sensor magnet. (A) Top view of a holding member and a sensor magnet, (b) AA sectional drawing of the same figure (a). (A) Top view of holding member and sensor magnet of another example, (b) BB sectional drawing of the same figure (a). (A) Top view of holding member and sensor magnet of another example, (b) CC sectional drawing of the same figure (a).

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, the motor 11 according to the present embodiment is a so-called geared motor including a motor body 12 and a speed reduction unit 13, for example, a motor used in a power window device. The motor body 12 includes a yoke housing 14, a pair of magnets 15, an armature 16, a brush holder 17, and a pair of brushes 18.

  The yoke housing 14 has a bottomed cylindrical shape, and a pair of magnets 15 are fixed to the inner surface thereof. An armature 16 is rotatably accommodated inside the magnet 15, and a base end portion of a rotating shaft 20 provided in the armature 16 is supported by a bearing 19 provided at the center of the bottom of the yoke housing 14. A flange portion 14b extending outward in the radial direction is formed in the opening portion 14a of the yoke housing 14, and the flange portion 14b is fixed to the opening portion 31a of the gear housing 31 of the speed reduction portion 13 by a screw 21. ing. At the time of fixing, the brush holder 17 is interposed between the openings 14 a and 31 a of the yoke housing 14 and the gear housing 31.

  The brush holder 17 holds, in the yoke housing 14, a bearing 22 that pivotally supports a distal end portion of the rotary shaft 20 and a pair of brushes 18 that are in sliding contact with a commutator 23 fixed to the rotary shaft 20. . A plurality of terminals 24 are inserted into the brush holder 17, and one end of each terminal 24 is electrically connected to the brush 18, a rotation sensor 42 described later, and the like. In addition, a connector portion 17a for connecting to an external connector (not shown) is formed at a portion of the brush holder 17 that protrudes to the outside of the housings 14 and 31, and the connector portion 17a has a connection recess 17b. The other end of the terminal 24 is exposed. When an external connector is connected to the connector portion 17a, the motor 11 and the external ECU 61 are electrically connected.

The speed reduction unit 13 includes a gear housing 31, a speed reduction mechanism 34 including a worm shaft 32 and a worm wheel 33, an output shaft 35, and a joint 41.
The gear housing 31 has an opening 31 a that faces the opening 14 a of the yoke housing 14, and a joint housing portion 31 b is recessed from the opening 31 a in the axial direction. The joint housing portion 31b extends in the axial direction from the bottom thereof and has a substantially cylindrical shaft housing tube portion 31c that houses the worm shaft 32, and a substantially circular shape housing the worm wheel 33 continuously with the shaft housing tube portion 31c. A wheel accommodating portion 31d is formed.

  Bearings 36 and 37 are attached to both ends in the axial direction of the shaft housing cylinder 31c, respectively, and the worm shaft 32 inserted into the shaft housing cylinder 31c can be rotated by the bearings 36 and 37. The rotary shaft 20 is supported so as to be coaxial. A worm gear portion 32 a is formed between the support portions of the worm shaft 32 by the bearings 36 and 37. A thrust receiving ball 38 and a thrust receiving plate 39 for receiving the thrust load of the worm shaft 32 are disposed at the tip-facing portion of the worm shaft 32 in the shaft accommodating cylinder portion 31c.

  A disc-shaped worm wheel 33 that meshes with the worm gear portion 32a of the worm shaft 32 is rotatably accommodated in the wheel accommodating portion 31d. An output shaft 35 is coupled to the worm wheel 33 so as to rotate integrally with the worm wheel 33.

  A joint 41 that is disposed between the worm shaft 32 and the rotating shaft 20 and connects the worm shaft 32 and the rotating shaft 20 is accommodated in the joint housing portion 31b. The joint 41 includes a driving side rotating body 41 a that rotates integrally with the rotating shaft 20 and a driven side rotating body 41 b that rotates integrally with the worm shaft 32.

  The motor 11 of this embodiment includes a rotation sensor 42 (rotation detection device) for detecting the rotation state of the rotary shaft 20. The rotation sensor 42 is fixed to a lower surface (an end surface on the side of the gear housing in the axial direction) of the brush holder 17 so as to be opposed to the sensor magnet 43 in the axial direction. It comprises a detection element 44 (for example, a Hall IC).

  As shown in FIGS. 2 and 3A and 3B, the sensor magnet 43 is a ring-shaped magnet in which N and S poles are magnetized at an equal pitch in the circumferential direction, and is a driving side rotating body of the joint 41. A holding member 51 which is integrally formed with 41a and constitutes a part of the driving side rotating body 41a is mounted. The sensor magnet 43 is arranged so that its central axis coincides with the axis L of the rotary shaft 20. Further, both end surfaces of the sensor magnet 43 in the axial direction (the end surface on the driven-side rotating body 41b side is the first end surface 43a and the opposite end surface is the second end surface 43b) are axes of the rotating shaft 20. The outer peripheral surface 43 c forms a plane centering on the axis L of the rotating shaft 20 while forming a planar shape orthogonal to the direction.

  The holding member 51 includes a substantially cylindrical base portion 52 that extends in the axial direction, and a magnet mounting portion 53 that extends continuously from the base portion 52 and to which the sensor magnet 43 is mounted. The magnet mounting portion 53 is formed with a contact portion 54 that forms a planar annular shape orthogonal to the axial direction of the rotary shaft 20. The contact portion 54 is in contact with the first end surface 43 a of the sensor magnet 43 in the axial direction.

  Further, the magnet mounting portion 53 is formed with a shaft portion 55 extending from the corresponding contact portion 54 toward the brush holder 17 in the axial direction (upper side in FIG. 2) on the inner peripheral side of the contact portion 54. The shaft portion 55 is inserted into the sensor magnet 43, and the outer peripheral surface 55 a of the shaft portion 55 is brought into contact with the inner peripheral surface 43 d of the sensor magnet 43 in the radial direction.

  A fixing hole 55b in which the tip end portion of the rotating shaft 20 is press-fitted and fixed is formed in the central portion of the shaft portion 55 in the axial direction. The inner peripheral surface of the fixed hole 55b has a two-plane width shape having a pair of planes parallel to each other, and the tip portion of the rotating shaft 20 press-fitted into the fixed hole 55b is also formed in a two-plane width shape. A plurality of crushing portions 55c (see FIG. 3) for press-fitting the distal end portion of the rotary shaft 20 are formed on the inner peripheral surface of the fixing hole 55b.

  In addition, the shaft portion 55 is formed with two rotation stop portions 55d protruding in a semicircular shape radially outward from the outer peripheral surface 55a at equal circumferential intervals (180 degree intervals). The pair of rotation stoppers 55d are fitted into a pair of engaging recesses 43e formed so as to be recessed radially outward on the inner peripheral surface 43d of the sensor magnet 43, and are engaged with the sensor magnet 43 in the circumferential direction. Yes.

  The magnet mounting portion 53 is formed with a cylindrical wall portion 56 extending in the axial direction from the outer edge of the contact portion 54. The wall portion 56 covers the outer peripheral surface 43c of the sensor magnet 43 over the entire circumferential direction and axial direction.

  The magnet mounting portion 53 has two elastic extension portions 57 extending in the axial direction from the contact portion 54 through the inner peripheral side of the sensor magnet 43 at equal intervals in the circumferential direction (180 degree intervals). Has been. The outer peripheral surface 57 a of each elastic extending portion 57 forms an arc shape along the inner peripheral surface 43 d of the sensor magnet 43 and is in contact with the inner peripheral surface 43 d of the sensor magnet 43 in the radial direction. Each elastic extending portion 57 is formed with an engaging convex portion 57b that extends radially outward from its tip portion and engages with the second end surface 43b of the sensor magnet 43 in the axial direction. The magnet mounting portion 53 holds the sensor magnet 43 from both sides in the axial direction by the engagement convex portion 57b and the contact portion 54. The elastic extension portion 57 is formed at a position 90 degrees away from the rotation stop portion 55d in the circumferential direction. That is, in the magnet mounting portion 53, the elastic extension portions 57 and the rotation stop portions 55d are alternately arranged at equal intervals in the circumferential direction.

  In addition, an elastic allowing portion 58 for allowing elastic deformation of the elastic extending portion 57 inward in the radial direction is formed between the elastic extending portions 57 and the shaft portion 55 in the radial direction. The elastic allowance 58 is set to a minimum dimension that allows for the amount of elastic deformation of the elastic extension 57 in the radial direction required when the sensor magnet 43 is attached.

  The detection element 44 that constitutes the rotation sensor 42 together with the sensor magnet 43 that is held by the holding member 51 and rotates integrally with the drive side rotating body 41 a changes to the H / L level according to each magnetic pole of the sensor magnet 43. A pulse signal is output to the ECU 61. Based on the pulse signal output from the detection element 44, the ECU 61 sequentially calculates the rotation direction, the rotation speed, the rotation amount, and the rotation position of the drive side rotating body 41a (the rotation shaft 20). Based on these, the operation information of the driving object (for example, the side glass of the vehicle or the sliding door) is monitored.

Next, assembly of the sensor magnet 43 to the holding member 51 will be described.
When the sensor magnet 43 is extrapolated to the shaft portion 55 of the magnet mounting portion 53 in the axial direction, the elastic extension portion 57 is radially inward so that the engagement convex portion 57 b in contact with the sensor magnet 43 avoids the sensor magnet 43. It is elastically deformed. Then, when the sensor magnet 43 is pushed in until the first end surface 43 a of the sensor magnet 43 abuts against the contact portion 54 of the magnet mounting portion 53, the engagement protrusion 57 b of the sensor magnet 43 is restored by the elastic return of the elastic extension portion 57. Engage with the second end face 43b in the axial direction. In this state, the sensor magnet 43 is held by the shaft portion 55 on the radially inner peripheral side and held by the wall portion 56 on the radially outer side. Further, each rotation stop portion 55 d of the shaft portion 55 is fitted in each engagement recess 43 e of the sensor magnet 43, and the movement of the sensor magnet 43 in the circumferential direction is restricted. That is, the sensor magnet 43 is restricted from moving in the axial direction, the radial direction, and the circumferential direction simply by assembling the first end surface 43 a of the sensor magnet 43 with the magnet mounting portion 53 so as to abut against the contact portion 54. The magnet mounting portion 53 is held in a state.

Next, characteristic effects of the present embodiment will be described.
(1) The holding member 51 includes an abutment portion 54 that abuts the first end surface 43 a in the axial direction of the sensor magnet 43 that has an annular shape around the rotation shaft 20, and an inner portion of the sensor magnet 43 from the abutment portion 54. An elastic extending portion 57 that extends in the axial direction of the rotary shaft 20 through the circumferential side and is elastically deformable in the radial direction is provided. The elastic extension portion 57 is provided with an engagement convex portion 57 b that extends in the radial direction and engages with the second end surface 43 b of the sensor magnet 43. The sensor magnet 43 is connected to the contact portion 54. It is supported from both sides in the axial direction by the engaging convex portion 57b. Accordingly, when the sensor magnet 43 is assembled to the holding member 51 in the axial direction, the elastic extension portion 57 is elastic in the radial direction so that the engaging convex portion 57 b in contact with the sensor magnet 43 avoids the sensor magnet 43. Deform. Then, when the sensor magnet 43 is pushed in until the first end face 43 a of the sensor magnet 43 abuts against the contact portion 54 of the holding member 51, the engagement protrusion 57 b is moved to the first position of the sensor magnet 43 by the elastic return of the elastic extension portion 57. 2 is engaged with the end face 43b. That is, the sensor magnet 43 is held by the holding member 51 in a state in which the movement in the axial direction is restricted by simply assembling the sensor magnet 43 with respect to the holding member 51 so that the end face in the axial direction abuts against the contact portion 54. Is possible. Thereby, the sensor magnet 43 can be easily held by the holding member 51.

  (2) Since the holding member 51 has the shaft portion 55 that is in contact with the inner peripheral surface of the sensor magnet 43 and maintains the coaxial state with the sensor magnet 43, the holding member 51 is formed by the shaft portion 55 that is in contact with the inner peripheral surface of the sensor magnet 43. The coaxial state between the holding member 51 and the sensor magnet 43 can be suitably maintained.

  (3) The elastic extending portion 57 is provided on the inner peripheral side of the sensor magnet 43 and allows elastic deformation of the elastic extending portion 57 between the elastic extending portion 57 and the shaft portion 55 in the radial direction. An elastic allowing portion 58 is formed. For this reason, the shaft portion 55 and the elastic extension portion 57 can be laid out on the inner peripheral side of the sensor magnet 43. Further, if the dimension of the elastic allowing portion 58 is set to the minimum dimension that allows for the amount of elastic deformation in the radial direction of the elastic extending portion 57, the elastic extending portion 57 can be disposed closer to the shaft portion 55, This contributes to downsizing around the shaft portion 55 and thus downsizing of the holding member 51.

  (4) The shaft portion 55 is provided with a rotation stop portion 55d that engages with the sensor magnet 43 in the rotation direction (circumferential direction), and the rotation stop portion 55d is located at a position different from the elastic extension portion 57 in the circumferential direction. It is formed. Thereby, since the rotation stop part 55d is formed in the position different from the elastic extension part 57 in the circumferential direction, the design freedom degree of the rotation stop part 55d can be improved.

(5) Since a plurality of elastic extending portions 57 are provided at equal intervals in the circumferential direction, the sensor magnet 43 can be held in a well-balanced manner.
(6) The holding member 51 has a wall portion 56 that covers the outer peripheral surface 43 c of the sensor magnet 43. Thereby, since the outer peripheral surface 43c of the sensor magnet 43 is covered by the wall portion 56, for example, when the sensor magnet 43 is cracked, it is possible to prevent the piece from falling off from the holding member 51 in the radial direction. Can do.

In addition, you may change embodiment of this invention as follows.
The configuration of the holding member 51 and the sensor magnet 43 in the above embodiment may be changed as appropriate, for example, as shown in FIGS. 4 and 5. In the configuration shown in FIG. 4, the rotation stop portion 55 d formed on the shaft portion 55 in the above embodiment is omitted, and instead, a rotation stop portion 71 that protrudes hemispherically in the axial direction from the contact portion 54 is formed. Yes. The rotation stopper 71 is fitted in an engagement recess 43 f formed in the first end surface 43 a of the sensor magnet 43 and is engaged in the circumferential direction. Even with such a configuration, it is possible to obtain substantially the same operational effects as in the above embodiment.

  Further, in the configuration shown in FIG. 5, the elastic extending portion 57 extending so as to pass through the inner peripheral side of the sensor magnet 43 in the above embodiment is omitted, and instead passes through the outer peripheral side of the sensor magnet 43. An extended elastic extension portion 72 is formed. The elastic extension portion 72 is formed at a location where the wall portion 56 is partially cut out, and is in contact with the outer peripheral surface 43 c of the sensor magnet 43 in the radial direction. The elastic extension portion 72 is formed with an engagement convex portion 72 a that extends radially inward from the tip end portion thereof and engages with the second end surface 43 b of the sensor magnet 43 in the axial direction. Even with such a configuration, it is possible to obtain substantially the same operational effects as in the above embodiment. In the configuration shown in FIG. 5, the elastic extending portion 72 is provided on the outer peripheral side of the sensor magnet 43, and thus the elastic allowing portion 58 provided on the shaft portion 55 in the above embodiment is omitted. Yes.

  Moreover, you may comprise so that the elastic extension part 57 may engage with the sensor magnet 43 in the circumferential direction. According to such a configuration, the elastic extension portion 57 also serves as a rotation stopper for the sensor magnet 43. Therefore, even if the rotation stopper portion 55d of the above embodiment is omitted, the movement restriction of the sensor magnet 43 in the circumferential direction is restricted. Therefore, the configuration of the holding member 51 can be simplified.

Moreover, it is good also as a structure which abbreviate | omitted the wall part 56 from the holding member 51 of the said embodiment.
In the above embodiment, the holding member 51 is integrally formed with the driving side rotating body 41a of the joint 41. However, the holding member 51 is not particularly limited thereto. For example, the holding member 51 is integrally formed with the driven side rotating body 41b of the joint 41. It is good.

  In the above embodiment, the wall 56 covers the entire outer circumferential surface 43c of the sensor magnet 43 in the circumferential direction. However, the present invention is not particularly limited thereto, and the configuration covers at least a part of the outer circumferential surface 43c. It is good.

  In the above-described embodiment, two rotation stoppers 55d and two engagement recesses 43e are provided. However, the present invention is not particularly limited thereto, and one or three or more may be provided.

Moreover, in the holding member 51 of the said embodiment, although the two elastic extension parts 57 were provided, it is not specifically limited to this, It is good also as a structure provided with 1 or 3 or more.
In the above embodiment, the sensor magnet 43 and the detection element 44 are configured to face each other in the axial direction. However, the present invention is not particularly limited thereto, and may be configured to face each other in the radial direction.

  In the above embodiment, the holding member 51 is provided on the joint 41 including the driving side rotating body 41a and the driven side rotating body 41b. However, the present invention is not particularly limited thereto. For example, the rotation of the rotation shaft 20 is transmitted to the worm shaft 32, while the rotation of the worm shaft 32 is not transmitted to the rotation shaft 20 side (the rotation is prevented) and held by the drive side rotation body or the driven side rotation body of the reverse rotation prevention clutch. The member 51 may be provided.

  In the above-described embodiment, the motor used in the power window device has been described as an example, but other than this, for example, a sliding door driving motor, a sunroof motor, a closer motor, or the like may be adopted.

  DESCRIPTION OF SYMBOLS 11 ... Motor, 20 ... Rotating shaft, 42 ... Rotation sensor (rotation detection apparatus), 43 ... Sensor magnet, 43a ... 1st end surface (axial direction one end surface) of a sensor magnet, 2nd end surface (axial direction) of a sensor magnet Other end surface), 43c ... outer peripheral surface of the sensor magnet, 43d ... inner peripheral surface of the sensor magnet, 44 ... detecting element, 51 ... holding member, 54 ... abutting portion, 55 ... shaft portion, 55d, 71 ... anti-rotation portion, 56 ... wall part, 57, 72 ... elastic extension part, 57b, 72a ... engagement convex part, 58 ... elastic allowance part.

Claims (7)

A rotation detection device that includes a sensor magnet that is held so as to be integrally rotatable with a rotation shaft via a holding member, and that detects a rotation state of the rotation shaft based on a detection signal from a detection element arranged to face the sensor magnet. In
The sensor magnet has an annular shape centered on the rotating shaft, and is assembled to the holding member from the axial direction of the rotating shaft,
The holding member is in contact with the one end surface in the axial direction of the sensor magnet, and extends from the contact portion in the axial direction of the rotating shaft through the inner peripheral side or the outer peripheral side of the sensor magnet. An elastic extension part that is elastically deformable in the radial direction,
The elastic extension portion is provided with an engagement convex portion that extends in the radial direction and engages with the other axial end surface of the sensor magnet,
The rotation detection device, wherein the sensor magnet is supported from both sides in the axial direction by the contact portion and the engagement convex portion. The rotation detection device according to claim 1,
The rotation detecting device according to claim 1, wherein the holding member has a shaft portion that is in contact with an inner peripheral surface of the sensor magnet and maintains a coaxial state with the sensor magnet. The rotation detection device according to claim 2,
The elastic extension is provided on the inner peripheral side of the sensor magnet,
A rotation detecting device, wherein an elastic allowing portion for allowing elastic deformation of the elastic extending portion is formed between the elastic extending portion and the shaft portion in a radial direction. In the rotation detection device according to claim 3,
The shaft portion is provided with a rotation stopping portion that engages with the sensor magnet in the rotation direction,
The rotation detecting device according to claim 1, wherein the rotation stopper is formed at a position different from the elastic extension in the circumferential direction. In the rotation detection device according to any one of claims 1 to 4,
A plurality of the elastic extension portions are provided at equal intervals in the circumferential direction. In the rotation detection device according to any one of claims 1 to 5,
The rotation detecting device, wherein the holding member has a wall portion covering at least a part of an outer peripheral surface of the sensor magnet.   A motor comprising the rotation detection device according to claim 1.

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