JP7153461B2 - motor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a motor provided with a biasing member that biases a rotor to one side in the axial direction.

In order to suppress the rattling of the rotor in the axial direction in the motor, a mode is adopted in which the rotor is urged in the axial direction by an urging member. On the other hand, in the motor disclosed in Patent Document 1, a first metallic washer, a coil spring, and a second metallic washer are arranged in order between the output-side end of the permanent magnet of the rotor and the radial bearing. is biased toward the anti-output side.

JP 2014-212686 A

The aspect described in Patent Document 1 requires two metal washers, resulting in a large number of parts. Moreover, in the aspect described in Patent Document 1, it is difficult to limit which part between the first washer and the coil spring and between the coil spring and the second washer will be the sliding part. Also, there is a possibility that sliding portions may be between the radial bearing and the first washer and between the second washer and the permanent magnet. Therefore, since the sliding portion cannot be limited, there is a problem that it is difficult to reduce the sliding resistance and take measures against wear.

In view of the above problems, it is an object of the present invention to provide a motor capable of axially urging a rotor with a small number of parts and limiting sliding portions.

In order to solve the above-described problems, a motor according to the present invention includes a rotor having a body projecting radially outward from the outer peripheral surface of a rotating shaft; a cylindrical stator facing the outer peripheral surface of the body; a fixed body having a first support facing one end in the axial direction of the body and a second support for supporting the rotor from the other side in the axial direction; the first support and the body; , and engages the one end in the circumferential direction when the rotor rotates, and rotates integrally with the rotor while sliding against the first support. and an urging member disposed between the sliding member and the trunk portion for urging the rotor toward the other side in the axial direction . A concave portion is formed toward the side opposite to the moving member, and the sliding member includes a plate portion for receiving the end portion of the biasing member opposite to the body portion side, and a projection that protrudes toward the body and abuts against the inner wall of the recess from the circumferential direction when the rotor rotates, the projection being separated from the bottom of the recess in the axial direction. , the one-side end portion is separated from the plate portion in the axial direction .

In the present invention, the sliding member and the biasing member are arranged in order between the first supporting portion of the fixed body and the body portion of the rotor, and the rotor is composed of two members consisting of the sliding member and the biasing member. is supported by the second support portion while being biased toward the other side in the axial direction. Therefore, rattling of the rotor in the axial direction can be suppressed with a small number of parts. Further, the sliding member is engaged with one end of the trunk in the circumferential direction when the rotor rotates, and rotates integrally with the rotor while sliding against the first support. Therefore, since the sliding portion is limited between the sliding member and the first support portion, it is easy to reduce the sliding resistance and take measures against wear. Moreover, according to this aspect, the sliding member can be rotated integrally with the rotor. Further, according to this aspect, even when a force directed toward one side in the axial direction is applied to the rotating shaft, the rotor can follow the force and move to the one side in the axial direction. Therefore, even when a force directed toward one side in the axial direction is applied to the rotating shaft, the applied force can be absorbed by moving the rotor toward the one side in the axial direction.

In the present invention, an aspect may be adopted in which the sliding member is made of resin. According to this aspect, the cost can be reduced as compared with the case where a metal part is used for the sliding member. In addition, it is easy to form a portion of the sliding member that engages with the body of the rotor.

In the present invention, an aspect may be adopted in which the biasing member is a coil spring. According to this aspect, the biasing member can be arranged using the space around the rotation shaft.

In the present invention, it is possible to employ a mode in which an annular groove in which the body-side end of the coil spring is arranged is formed in the one-side end so as to surround the rotating shaft. . According to this aspect, since a part of the coil spring is positioned in the annular groove of the body, the dimension of the motor in the axial direction can be shortened. In addition, it is possible to suppress radial displacement of the end portion of the coil spring on the side of the trunk portion.

In the present invention, the distance between the one-side end portion and the plate portion in the axial direction is wider than the distance between the convex portion and the bottom portion of the concave portion in the axial direction, and the convex portion and the bottom portion of the concave portion are spaced apart from each other. It is possible to employ a mode in which the convex portion abuts on the bottom portion of the concave portion at a portion avoiding the radially outer edge and the radially inner edge when abutting in the axial direction. According to this aspect, the range in which the rotor can move to the one side in the axial direction when a force on the one side in the axial direction is applied to the rotating shaft can be defined by the contact between the convex portion and the bottom portion of the concave portion. . At this time, since the convex portion abuts against the bottom portion of the concave portion at portions other than the radially outer edge and the radially inner edge, deformation of the convex portion can be suppressed.

In the present invention, it is possible to employ a mode in which the distance in the axial direction between the one-side end portion and the plate portion is narrower than the distance in the axial direction between the convex portion and the bottom portion of the concave portion. According to this aspect, the range in which the rotor can move to the one side in the axial direction when a force on the one side in the axial direction is applied to the rotating shaft is defined by the contact between the plate portion of the sliding member and the end portion of the trunk portion. can be defined by Therefore, deformation of the convex portion can be suppressed.

In the present invention, it is possible to employ an aspect in which the trunk portion is made of a permanent magnet fixed to the outer peripheral surface of the rotating shaft.

In the present invention, it is possible to use an aspect in which the first support portion is an end face of a radial bearing that rotatably supports the rotating shaft on the body portion side.

In the present invention, the sliding member and the biasing member are arranged in order between the first supporting portion of the fixed body and the body portion of the rotor, and the rotor is composed of two members consisting of the sliding member and the biasing member. is supported by the second support portion while being biased toward the other side in the axial direction. Therefore, rattling of the rotor in the axial direction can be suppressed with a small number of parts. Further, the sliding member is engaged with one end of the trunk in the circumferential direction when the rotor rotates, and rotates integrally with the rotor while sliding against the first support. Therefore, since the sliding portion is limited between the sliding member and the first support portion, it is easy to reduce the sliding resistance and take measures against wear.

1 is a perspective view of a motor to which the present invention is applied; FIG. FIG. 2 is an exploded perspective view of the motor shown in FIG. 1; 2 is a sectional view of the motor shown in FIG. 1; FIG. FIG. 2 is an enlarged cross-sectional view showing a space between a bearing of the motor shown in FIG. 1 and a body portion of the rotor; 5 is a perspective view of the sliding member and the like shown in FIG. 4 as viewed from one side in the axial direction; FIG. 5 is a perspective view of the sliding member and the like shown in FIG. 4 as viewed from the other side in the axial direction; FIG. FIG. 5 is a cross-sectional view showing a modification of the convex portion of the motor to which the present invention is applied;

An embodiment of the present invention will be described below with reference to the drawings.

(Overall configuration of motor)
FIG. 1 is a perspective view of a motor 1 to which the present invention is applied. FIG. 2 is an exploded perspective view of the motor 1 shown in FIG. FIG. 3 is a cross-sectional view of the motor 1 shown in FIG. The motor 1 shown in FIG. 1 is a stepping motor, and as described below with reference to FIGS. consists of The motor 1 is used, for example, as a drive source for an air-fuel mixture flow control valve (attachment target member) of a gasoline engine, and is required to be highly airtight when installed. Therefore, the motor 1 is configured as a closed motor.

The motor case 10 is made of a magnetic metal such as iron and has a cup-like shape. It has an end plate portion 12 formed as follows. The other side Lb of the peripheral wall portion 11 in the direction of the axis L is an opening portion 111 .

The stator 20 is a cylindrical body arranged inside the motor case 10, and includes a coil 21, a bobbin 40, a yoke 23 (outer stator core), and a yoke 24 (inner stator core). Each of the yokes 23 and 24 is an annular plate member made of metal, and a plurality of pole teeth 25 bent in the axial direction are formed on the inner peripheral edge thereof at equal intervals in the circumferential direction. Two pairs of yokes 23 and 24 are arranged in the direction of the axis L with their pole teeth 25 arranged alternately in the circumferential direction.

The bobbin 40 is a resin-molded product in which the yokes 23 and 24 are molded with a synthetic resin 41, and is constructed by insert injection molding in a mold with the yokes 23 and 24 inserted in the mold. The synthetic resin 41 covers the outer peripheral portions 232 and 242 of the yokes 23 and 24 and the inner peripheral surfaces of the pole teeth 25, and covers the portions of the yokes 23 and 24 overlapping the annular portions 233 and 243. constitutes a space around which the coil 21 is wound. The stator 20 configured in this manner is arranged so that the outer peripheral portions 232 and 242 of the yokes 23 and 24 are partially in contact with the inner side of the peripheral wall portion 11 of the motor case 10 .

A terminal block 45 is formed integrally with the end of the other side Lb of the bobbin 40 in the direction of the axis L, and the end of the other side Lb of the motor case 10 in the direction of the axis L abuts against the terminal block 45. ing. The terminal block 45 holds a plurality of terminal pins 80 extending in a first direction X orthogonal to the direction of the axis L so as to be arranged in parallel in the direction of the axis L and the second direction Y orthogonal to the first direction X. ing. One end 81 of the terminal pin 80 is covered with a cover 60 fixed to the bobbin 40 with an end (not shown) of the coil 21 connected thereto by welding, soldering, or the like. In this state, the opening 111 of the motor case 10 is blocked by the terminal block 45 and the cover 60 . The other end 82 of the terminal pin 80 protrudes from the terminal block 45 and is used for electrical connection with the outside.

In the bobbin 40, a bearing hole 46 recessed on the other side Lb in the direction of the axis L is formed in a portion positioned on one side La in the direction of the axis L with respect to the terminal block 45. A cylindrical bearing 91 with a bottom is arranged inside. The bearing 91 is made of resin. The bearing 91 is a cylindrical member with a bottom, and includes a cylindrical portion 911 that rotatably supports the outer peripheral surface of the end portion 310 on the other side Lb of the rotating shaft 31 described later in the direction of the axis L, and the end of the rotating shaft 31. and an inner bottom portion 912 that supports the portion 310 from the other side Lb in the axis L direction.

The rotor 30 includes a rotating shaft 31 extending in the direction of the axis L, and a cylindrical permanent magnet 32 fixed to the outer peripheral surface of the rotating shaft 31. The outer peripheral surface of the permanent magnet 32 has N poles and S poles are alternately magnetized. In the rotor 30, the permanent magnets 32 form a body portion 33 projecting radially outward from the rotating shaft 31, and the pole teeth 25 of the stator 20 are radially aligned with the body portion 33 (permanent magnets 32) of the rotor 30. They are facing each other on the outside. In the rotary shaft 31, an end portion 310 supported by the inner bottom portion 912 of the bearing 91 has a convex curved surface.

A hole 120 is formed in the end plate portion 12 of the motor case 10, and a part of the rotary shaft 31 protrudes from the hole 120 toward one side La in the direction of the axis L. In this embodiment, a portion of the rotating shaft 31 protruding from the end plate portion 12 of the motor case 10 is formed with an output shaft 39 having a spiral groove (not shown). Therefore, the rotation of the output shaft 39 can linearly drive the valve body and the like.

A bearing 92 is held in a hole 120 formed in the end plate portion 12 of the motor case 10 . The bearing 92 is made of metal such as a sintered body. The bearing 92 has a cylindrical portion 921 that rotatably supports the rotating shaft 31 and a flange portion 922 that extends radially outward from the end of the cylindrical portion 921 on the other side Lb in the direction of the axis L. . The flange portion 922 is press-fitted onto the bobbin 40 and fixed by a method of sandwiching it between the bobbin 40 and the end plate portion 12 in the direction of the axis L. As shown in FIG.

In the motor 1 configured as described above, the opening 111 of the motor case 10 in the direction of the axis L is closed by the terminal block 45 integrally formed on the bobbin 40 and the cover 60. In this state, the terminal block 45 and the cover 60 are closed. 60 and the end of the motor case 10 in the direction of the axis L are covered with a connector housing 70 made of resin. The connector housing 70 is a resin portion molded so as to cover the terminal block 45, the cover 60, and the ends of the motor case 10 in the direction of the axis L at the final stage of the assembly process. is firmly fixed to the motor case 10 in a completely sealed state. In this state, most of the motor case 10 is exposed except for the portion located on the other side Lb in the direction of the axis L. As shown in FIG. Therefore, the heat generated by the coil 21 can be efficiently released to the outside through the motor case 10 made of metal. Therefore, insulation failure, thermal deformation of each member, thermal demagnetization of the permanent magnet 32, etc. due to the melting of the insulating coating of the coil 21 can be suppressed. In addition, since the portion covered with resin is reduced, it is possible to reduce the diameter, weight, and cost.

A surface of the connector housing 70 facing one side La in the direction of the axis L of the motor case 10 is a flange surface 71 for attachment to the air-fuel mixture flow control valve. The flange surface 71 is formed by a plane perpendicular to the axial direction of the motor case 10. The motor case 10 is inserted into, for example, an opening of an air-fuel mixture flow control valve, and is attached to a planar mounting surface on the periphery of the opening. , directly or via a sealing member such as an O-ring, to maintain airtightness.

The connector housing 70 has a tubular waterproof connector portion 72 that opens so that the ends 82 of the terminal pins 80 are open in the first direction X. As shown in FIG.

(Prevent rattling of rotor 30)
FIG. 4 is an enlarged cross-sectional view showing a space between the bearing 92 of the motor 1 shown in FIG. 1 and the body portion 33 of the rotor 30. As shown in FIG. 5 is a perspective view of the sliding member 96 and the like shown in FIG. 4 as viewed from one side La in the direction of the axis L. FIG. 6 is a perspective view of the sliding member 96 and the like shown in FIG. 4 as viewed from the other side Lb in the direction of the axis line L. FIG. 5 and 6 show only the permanent magnets 32 (body portion 33) of the rotor 30. FIG.

In this embodiment, as described below with reference to FIG. 4, the motor case 10, the stator 20, the bobbin 40, and the bearings 91 and 92 constitute the fixed body 2 that supports the rotor 30. Reference numeral 2 denotes a first support portion 201 facing an end portion 331 on one side La of the body portion 33 of the rotor 30 in the direction of the axis L, and a second support portion 202 supporting the rotor 30 from the other side Lb in the direction of the axis L. have. In this embodiment, the first support portion 201 is the flange portion 922 of the bearing 92 fixed by the end plate portion 12 of the motor case 10 and the bobbin 40, and the second support portion 202 is the bearing held by the bobbin 40. 91 is the inner bottom 912 .

In this embodiment, as shown in FIGS. 4, 5 and 6, there is sliding between the flange portion 922 of the bearing 92 of the fixed body 2 and the end portion 331 of the body portion 33 (permanent magnet 32) of the rotor 30. A moving member 96 is arranged, and a biasing member 97 is arranged between the sliding member 96 and the trunk portion 33 .

The biasing member 97 is a coil spring 970 arranged around the rotating shaft 31 , and the end 971 of the coil spring 970 on the side of the body 33 is positioned at the end 331 of the body 33 so as to surround the rotating shaft 31 . is disposed inside an annular groove 332 formed in the . Such a configuration can be formed by forming a hole 339 having a larger diameter than the hole 338 in a region including the opening of the hole 338 through which the rotating shaft 31 penetrates in the trunk portion 33. As a result, the hole 338 (annular groove 332) is It is surrounded by the cylindrical portion 335 .

At the bottom 333 of the annular groove 332, the inner edge is a tapered surface 333a. The boundary between the bottom portion 333 and the side wall 334 of the annular groove 332 is a tapered surface 333b, and the end portion 971 of the coil spring 970 contacts the bottom portion 333 between the tapered surfaces 333a and 333b. ing.

The sliding member 96 engages with the end portion 331 of the body portion 33 (permanent magnet 32) of the rotor 30 when the rotor 30 rotates, and rotates integrally with the rotor 30 while sliding against the flange portion 922. . In this embodiment, the sliding member 96 is made of resin, and includes a circular plate portion 961 that receives an end portion 972 of the coil spring 970 on the side opposite to the body portion 33 side. A through hole 963 through which the rotating shaft 31 passes is formed in the center of the plate portion 961 . In this embodiment, the inner edge 962a of the projection 962 overlaps the annular groove 332 when viewed from the axis L direction.

At the end portion 331 of the body portion 33 of the rotor 30 , a concave portion 336 is formed in a cylindrical portion 335 positioned around the annular groove 332 toward the side opposite to the sliding member 96 . The convex portion 962 of is positioned inside the concave portion 336 . Therefore, when the rotor 30 rotates, the inner wall 336a of the concave portion 336 abuts against the convex portion 962 of the sliding member 96, and the sliding member 96 moves toward the rotor 30.
rotate together. In this embodiment, the outer peripheral surface 335a of the cylindrical portion 335 is tapered.

In this embodiment, the protrusions 962 are formed at two locations facing each other with the through hole 963 interposed therebetween. The recessed portion 336 is formed by notching the cylindrical portion 335 at two locations facing each other across the annular groove 332 , and the two projecting portions 962 are located inside the two recessed portions 336 .

Here, the convex portion 962 is separated from the bottom portion 336b of the concave portion 336 in the direction of the axis L, and the end portion 331 (cylindrical portion 335) is separated from the plate portion 961 in the direction of the axis L. In this embodiment, the distance d1 (see FIG. 4) between the end portion 331 (cylindrical portion 335) and the plate portion 961 in the direction of the axis L is the distance d2 (see FIG. 4) between the projection 962 and the bottom 336b of the recess 336 in the direction of the axis L. 4) wider.

(Main effects of this form)
As described above, in the motor 1 of this embodiment, the sliding member 96 and a biasing member 97 are arranged in order, and the rotor 30 is biased toward the other side Lb in the direction of the axis L by the two members consisting of the sliding member 96 and the biasing member 97. It is supported by the portion 202 . Therefore, rattling of the rotor 30 in the direction of the axis L can be suppressed with a small number of parts. Further, when the rotor 30 rotates, the sliding member 96 engages with the end portion 331 of the body portion 33 on one side La in the direction of the axis L in the circumferential direction and slides on the first support portion 201 . while rotating integrally with the rotor 30 . Therefore, since the sliding portion is limited between the sliding member 96 and the first support portion 201, it is easy to reduce the sliding resistance and take measures against wear.

Further, since the biasing member 97 is the coil spring 970 , the biasing member 97 can be arranged using the space around the rotating shaft 31 . Further, in the end portion 331 of the body portion 33, an annular groove 332 in which the end portion 971 of the coil spring 970 on the side of the body portion 33 is arranged is formed so as to surround the rotating shaft 31. The dimension in the direction of the axis L can be shortened. In addition, it is possible to suppress radial displacement of the end portion 971 of the coil spring 970 on the body portion 33 side. Moreover, since the sliding member 96 is made of resin, the cost can be reduced. Further, it is easy to form a portion of the sliding member 96 that engages with the body portion 33 of the rotor 30 .

A concave portion 336 is formed in the end portion 331 of the trunk portion 33, and a convex portion 962 is formed in the sliding member 96 with which the inner wall of the concave portion 336 abuts from the circumferential direction. Therefore, the sliding member 96 can be rotated integrally with the rotor 30 with a simple structure. Further, the convex portion 962 is separated from the bottom portion 336b of the concave portion 336 in the direction of the axis L, and the end portion 331 (cylindrical portion 335) is separated from the plate portion 961 in the direction of the axis L. Therefore, even when a force toward one side La in the direction of the axis L is applied to the rotating shaft 31 from the outside, the rotor 30 can move to the one side La in the direction of the axis L by following the force. Therefore, even when a force directed toward one side La in the direction of the axis L is applied to the rotary shaft 31, the force can be absorbed by the rotor 30 moving toward the one side La in the direction of the axis L.

A distance d1 between the end portion 331 (cylindrical portion 335) and the plate portion 961 in the direction of the axis L is wider than a distance d2 between the projection 962 and the bottom portion 336b of the recess 336 in the direction of the axis L. Therefore, in this embodiment, the range in which the rotor 30 can move to the one side La in the direction of the axis L when the force on the one side La in the direction of the axis L is applied to the rotating shaft 31 is defined by the projection 962 and the bottom 336b of the recess 336. can be defined by the abutment of

(Modification 1 of the present invention)
FIG. 7 is a cross-sectional view showing a modification of the convex portion 962 of the motor 1 to which the present invention is applied. 7 shows only the permanent magnets 32 (body portion 33) of the rotor 30. As shown in FIG. As shown in FIG. 7, also in this embodiment, as in the above-described embodiments described with reference to FIGS. It is wider than the distance d2 between the projection 962 and the bottom 336b of the recess 336 in the direction of the axis L. Therefore, the range in which the rotor 30 can move to the one side La in the direction of the axis L when the force on the one side La in the direction of the axis L is applied to the rotary shaft 31 is determined by the contact between the projection 962 and the bottom 336b of the recess 336. can be stipulated. Here, the inner edge 962a of the convex portion 962 overlaps the annular groove 332 when viewed from the axis L direction.

In this embodiment, the outer edge of the projection 962 is a tapered surface 962b. Therefore, even when the force on the one side La in the direction of the axis L is applied to the rotating shaft 31 and the rotor 30 moves to the one side La in the direction of the axis L, the inner edge 962a and the outer edge (tapered surface 962b) of the projection 962 are does not contact the trunk portion 33, and the convex portion 962 contacts the bottom portion 336b of the concave portion 336 at a portion avoiding the radially outer edge and the radially inner edge (inner edge 962a). Therefore, even if the sliding member 96 is made of resin, the protrusions 962 are less likely to deform.

(Modification 2 of the present invention)
Although illustration is omitted, in this embodiment, the distance d1 between the end portion 331 (cylindrical portion 335) and the plate portion 961 in the direction of the axis L is the same as that of the bottom portion 336b of the convex portion 962 and the concave portion 336, contrary to the above embodiment. is narrower than the interval d2 in the direction of the axis L of . Therefore, the range in which the rotor 30 can move to the one side La in the direction of the axis L when the force on the one side La in the direction of the axis L is applied to the rotary shaft 31 is It is defined by contact with the portion 331 (cylindrical portion 335). Therefore, even if the sliding member 96 is made of resin, deformation of the projection 962 can be suppressed. In addition, since the outer peripheral surface 335a of the cylindrical portion 335 is tapered, when the plate portion 961 of the sliding member 96 and the end portion 331 (cylindrical portion 335) of the body portion 33 come into contact with each other, the cylindrical portion 335 does not touch the outer edge of the plate portion 961 . Therefore, even if the sliding member 96 is made of resin, the plate portion 961 can be prevented from being damaged.

(another embodiment)
In the above embodiment, the body portion 33 of the rotor 30 is composed of the permanent magnets 32. However, if the permanent magnets 32 are fixed to the large-diameter portion of the rotating shaft 31, the large-diameter portion of the rotating shaft 31 and the permanent magnet 32 constitute a body portion 33 of the rotor 30 . The present invention may be applied to such a configuration. In the above-described embodiment, in the fixed body 2 , the first support portion 201 facing the body portion 33 of the rotor 30 is the flange portion 922 of the bearing 92 . The present invention may be applied when one support portion 201 is configured. Although the motor 1 is a stepping motor in the above embodiment, the present invention may be applied to other types of motors.

(Still another embodiment)
The bearing 92 is configured by being press-fitted into the bobbin 40 and sandwiched between the bobbin 40 and the end plate portion 12, but the bearing 92 may be directly fixed to the motor case 10 by caulking or the like.

DESCRIPTION OF SYMBOLS 1... Motor 2... Fixed body 10... Motor case 11... Peripheral wall part 12... End plate part 20... Stator 21... Coil 23, 24... Yoke 25... Pole tooth 30... Rotor 31... Rotating shaft 32 Permanent magnet 33 Body 39 Output shaft 40 Bobbin 41 Synthetic resin 45 Terminal block 46 Bearing hole 60 Cover 70 Connector housing 72 Waterproof connector portion 80 Terminal pin 91, 92 Bearing 96 Sliding member 97 Biasing member 201
First support portion 202 Second support portion 332 Annular groove 334 Side wall 335 Cylindrical portion 336 Recessed portion 336a Inner wall 921 Cylindrical portion 922 Flange portion 961 Plate portion 962... Convex portion, 970... Coil spring

Claims (8)

a rotor having a body projecting radially outward from the outer peripheral surface of the rotating shaft;
A cylindrical stator facing the outer peripheral surface of the body, a first support facing one end of the body in the axial direction, and a second support supporting the rotor from the other side in the axial direction. a fixed body comprising
It is arranged between the first support portion and the trunk portion, engages with the one side end portion in the circumferential direction when the rotor rotates, and slides with respect to the first support portion. a sliding member that rotates integrally with the rotor;
a biasing member disposed between the sliding member and the trunk portion to bias the rotor toward the other side in the axial direction;
has
The one-side end portion is formed with a concave portion recessed toward the side opposite to the sliding member,
The sliding member includes a plate portion for receiving an end portion of the urging member opposite to the body portion side, and a plate portion that protrudes from the plate portion toward the body portion so that when the rotor rotates, the concave portion is formed. a convex portion that abuts the inner wall from the circumferential direction,
the projection is spaced apart from the bottom of the recess in the axial direction;
The motor , wherein the one end is spaced apart from the plate in the axial direction . 2. The motor according to claim 1, wherein said sliding member is made of resin. 3. The motor according to claim 1, wherein said biasing member is a coil spring. 4. The one-side end portion is formed with an annular groove surrounding the rotating shaft, in which the end portion of the coil spring on the side of the trunk portion is arranged. motor. the interval in the axial direction between the one-side end portion and the plate portion is wider than the interval in the axial direction between the convex portion and the bottom portion of the concave portion;
When the convex portion and the bottom portion of the concave portion abut in the axial direction, the convex portion contacts the bottom portion of the concave portion at a portion avoiding the radially outer edge and the radially inner edge. Motor according to any one of claims 1 to 4 . 5. Any one of claims 1 to 4 , wherein the distance in the axial direction between the one-side end portion and the plate portion is narrower than the distance in the axial direction between the convex portion and the bottom portion of the concave portion. motor as described above. 7. The motor according to any one of claims 1 to 6 , wherein the body portion comprises a permanent magnet fixed to the outer peripheral surface of the rotating shaft. 8. The motor according to any one of claims 1 to 7 , wherein the first support portion is an end surface of a radial bearing that rotatably supports the rotating shaft on the side of the trunk portion.

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