Motor

Abstract

A motor is helpful for suppressing noise during operation. A motor according to the present invention comprises: a support shaft; the rotor is provided with a holding piece and a magnet, the holding piece is sleeved on the supporting shaft in a manner of rotating relative to the supporting shaft, one side of the holding piece in the axial direction is provided with a holding part for holding the magnet, and the other side of the holding piece in the axial direction is provided with a bearing part; and a holding section that is rotatably supported by the support shaft via the bearing section, and that has a bush fixed to one side in the axial direction in the holding section, the bush having an annular section that surrounds the support shaft and an elastic section that protrudes from the annular section toward the other side in the axial direction and that at least the tip of the elastic section is elastically deformable in the radial direction. And only the front end is abutted against the supporting shaft.

Description

Technical Field

[0001] This invention relates to a motor. Background Technology

[0002] In the past, there was a type of motor, such as Figure 8 As shown, it includes: a support shaft 90X; and a rotor 20X, the rotor 20X having a retainer 21X and a magnet 22X, the retainer 21X being rotatably fitted onto the support shaft 90X relative to the support shaft 90X, and on one side in the axial direction ( Figure 8 The lower side of the magnet 22X has a holding portion 211X for holding the magnet 22X. Furthermore, as... Figure 8 As shown, the retainer 21X has a bearing portion 212X along the entire axial direction and is supported by the support shaft 90X via the bearing portion 212X so that it can rotate.

[0003] However, in the motor described above, there is a radial clearance between the inner hole of the retainer 21X (the inner circumferential surface of the bearing portion 212X) and the support shaft 90X. Therefore, if the clearance increases due to manufacturing or thermal expansion during use, a "knocking" noise will be generated when the motor is working due to the collision between the inner circumferential surface of the bearing portion 212X and the support shaft 90X. In particular, this noise becomes more noticeable when there is no lubricating oil between the inner circumferential surface of the bearing portion 212X and the support shaft 90X. Summary of the Invention

[0004] The present invention was made in view of the above-mentioned problems, and its purpose is to provide a motor that helps to suppress noise during operation.

[0005] To achieve the above objectives, the present invention provides a motor comprising: a support shaft; and a rotor having a retainer and a magnet, the retainer being rotatably fitted onto the support shaft and having a retaining portion for retaining the magnet on one axially oriented side, wherein the retainer has a bearing portion on the other axially oriented side and is supported by the support shaft via the bearing portion to be rotatable, a bushing being fixed on one axially oriented side within the retaining portion, the bushing having an annular portion surrounding the support shaft and an elastic portion protruding from the annular portion toward the other axially oriented side and having at least a front end capable of elastic deformation in the radial direction, and abutting against the support shaft only at the front end.

[0006] According to the motor of the present invention, the retainer has a bearing portion on the other side in the axial direction and is supported by a support shaft via the bearing portion to be rotatable. A bushing is fixed on one side in the axial direction within the retainer. The bushing has an annular portion surrounding the support shaft and an elastic portion protruding from the annular portion toward the other side in the axial direction and having an elastic deformation capability at least at its front end in the radial direction. The bushing abuts against the support shaft only at the front end of the elastic portion. Therefore, the collision between the retainer and the support shaft during motor operation can be suppressed, thereby suppressing noise during operation. Furthermore, the abutment portion between the bushing and the support shaft can be easily brought close to the middle portion in the axial direction of the magnet, thereby reducing the deviation of the force generated by the deformation of the elastic portion and stably suppressing the collision between the retainer and the support shaft.

[0007] Furthermore, in the motor of the present invention, it is preferable that the end of the other side of the elastic portion in the axial direction overlaps radially with the middle portion in the axial direction of the magnet.

[0008] According to the motor of the present invention, the end of the other side of the elastic part in the axial direction overlaps with the middle part of the magnet in the radial direction. Therefore, the deviation of the force generated by the deformation of the elastic part can be reduced, thereby stably suppressing the collision between the retainer and the support shaft.

[0009] Furthermore, in the motor of the present invention, the bushing preferably has a fitting portion that protrudes from the annular portion toward the axial side at a distance from the elastic portion on the radially outer side, and the amount of protrusion is smaller than that of the elastic portion. The bushing is fixed to the retaining portion by pressing the fitting portion into the inner circumferential surface of the retaining portion.

[0010] According to the motor of the present invention, the bushing has a fitting portion that protrudes from the annular portion toward the axial side at a distance from the elastic portion on the radially outer side, and the amount of protrusion is smaller than that of the elastic portion. The bushing is fixed to the retaining portion by pressing the fitting portion into the inner circumferential surface of the retaining portion. Therefore, the pressing length of the fitting portion can be adjusted independently of the elastic portion, which facilitates the control of the pressing operation and pull-out strength of the bushing. Furthermore, it is easy to observe and confirm whether there are forming defects in the elastic portion, thereby ensuring that the manufactured motor meets the design requirements.

[0011] Furthermore, in the motor of the present invention, it is preferable that, in the axial direction, one end of the bearing portion is located near the end face of the other side of the magnet in the axial direction.

[0012] According to the motor of the present invention, in the axial direction, the end of one side of the bearing portion is located near the end face of the other side of the magnet in the axial direction. Therefore, the bearing shaft can be ensured to support the bearing area, thereby ensuring the support strength. Furthermore, the bearing portion and the magnet can be properly separated in the axial direction, which helps to further suppress the noise generated by the collision between the retainer and the support shaft.

[0013] Furthermore, in the motor of the present invention, it is preferable that the retaining portion has a receiving hole and a connecting hole, the receiving hole extending from one axial side of the retaining portion toward the other axial side and for receiving the bushing, the connecting hole extending from the receiving hole toward the other axial side to the bearing portion, and a stepped surface facing the axial side being formed between the connecting hole and the bearing portion.

[0014] According to the motor of the present invention, the retaining part is formed with a receiving hole and a connecting hole. The receiving hole extends from one end of the retaining part in the axial direction to the other side in the axial direction and is used to receive the bushing. The connecting hole extends from the receiving hole to the bearing part in the axial direction. A stepped surface facing the axial direction is formed between the connecting hole and the bearing part. Therefore, when the retaining part is manufactured by resin molding, even if a positioning pin is required to be provided through the center of the core for molding the connecting hole in the axial direction, it can be ensured that the end of the core in the axial direction has sufficient thickness, thereby ensuring the strength of the core. It can also ensure the coaxiality of the openings of the center hole of the core on both sides in the axial direction. Furthermore, it is not necessary to provide a recessed hole from the end face of the retaining part in the axial direction to the axial direction to reduce the wall thickness of the retaining part in the axial direction, suppressing shrinkage cavities caused by excessive wall thickness during resin molding, and making molding easier.

[0015] Furthermore, in the motor of the present invention, the connecting hole is preferably a tapered hole centered on the rotation axis of the rotor and with its diameter decreasing towards the axial direction.

[0016] According to the motor of the present invention, the connecting hole is a tapered hole centered on the rotation axis of the rotor and whose diameter decreases as it moves towards the axial direction. Therefore, it is easy to reduce the outer diameter of the part of the bearing adjacent to the retaining part.

[0017] Furthermore, in the motor of the present invention, it is preferable that the portion of the retainer corresponding to the connecting hole in the axial direction is formed continuously in the radial direction throughout the circumference.

[0018] According to the motor of the present invention, the portion of the retainer corresponding to the connecting hole in the axial direction is formed continuously in the radial direction throughout the circumference. Therefore, when the retainer is manufactured by resin molding, the molding die is easily simplified and the manufacturing cost is reduced.

[0019] Furthermore, in the motor of the present invention, it is preferable that an abutting portion is provided inside the retaining portion, the abutting portion being abutted by the plane of the outer peripheral side of the annular portion from one side in the axial direction.

[0020] According to the motor of the present invention, an abutting portion is provided inside the retaining portion, which is abutted by the plane of the outer peripheral side of the annular portion from one side in the axial direction, thus making it easy to ensure the flatness of the press-in.

[0021] Furthermore, in the motor of the present invention, it is preferable that a chamfer is formed at one end of the inner circumferential surface of the annular portion on one side in the axial direction.

[0022] According to the motor of the present invention, a chamfer is formed at one end of the inner circumferential surface of the annular portion on one side in the axial direction, so that the support shaft can be conveniently inserted into the bushing from the axial direction by means of the chamfer of the annular portion.

[0023] Furthermore, in the motor of the present invention, the support shaft is preferably made of metal, the bushing is made of resin, the magnet is disposed on the outer peripheral surface of the retaining portion and is cylindrical, the end of the elastic portion on the other side in the axial direction overlaps radially with the center of the magnet in the axial direction, the elastic portion includes a plurality of elastic sheets disposed at equal intervals in the circumferential direction, the bushing is made of resin and has a fitting portion that protrudes from the annular portion toward the other side in the axial direction in a manner spaced apart from the elastic portion in the radial direction and surrounds the support shaft, the bushing is fixed to the retaining portion by pressing the fitting portion into the inner peripheral surface of the retaining portion, an abutting portion is provided inside the retaining portion for the outer peripheral edge of the annular portion to abut from one side in the axial direction, the bushing has an abutting portion that protrudes from the inner peripheral side of the annular portion toward the axial direction than the magnet and the retaining portion, the outer peripheral surface of the annular portion is spaced apart from the inner peripheral surface of the retaining portion and faces it, and the outer peripheral portion of the end face of the axial side of the annular portion is perpendicular to the axial direction.

[0024] Furthermore, in the motor of the present invention, the motor preferably has a housing, within which the rotor is held via the support shaft, and within the housing, there is also

[0025] The assembly includes a partition and a gear set. The partition has a through hole through which the retaining member passes along the axial direction. The gear set is located on the other side of the partition along the axial direction. The bearing portion has a gear portion on its outer peripheral side that meshes with one of the gears in the gear set and is positioned on the side axially higher than the partition.

[0026] According to the motor of the present invention, the bearing portion has a gear portion on its outer peripheral side that meshes with a gear in the gear set, and is formed at a position on the axially upward side of the partition. Therefore, the area of ​​the bearing portion is increased, and the rotor can rotate stably.

[0027] (Invention Effects)

[0028] According to the present invention, the retainer has a bearing portion on the other side in the axial direction and is supported by a support shaft via the bearing portion to be rotatable. A bushing is fixed on one side in the axial direction within the retainer. The bushing has an annular portion surrounding the support shaft and an elastic portion protruding from the annular portion toward the other side in the axial direction and having an elastic deformation capability at least at its front end in the radial direction. The bushing abuts against the support shaft only at the front end of the elastic portion. Therefore, it can suppress the collision between the retainer and the support shaft when the motor is working, thereby suppressing noise during operation. Furthermore, it is easy to bring the abutment portion of the bushing and the support shaft close to the middle portion in the axial direction of the magnet, thereby reducing the deviation of the force generated by the deformation of the elastic portion and stably suppressing the collision between the retainer and the support shaft. Attached Figure Description

[0029] Figure 1 This is a perspective view schematically illustrating a motor according to an embodiment of the present invention.

[0030] Figure 2 This is a schematic side sectional view of a motor according to an embodiment of the present invention.

[0031] Figure 3 This is a side sectional view schematically illustrating a portion of the structure of a motor according to an embodiment of the present invention.

[0032] Figure 4 This is a schematic side sectional view of the rotor in a motor according to an embodiment of the present invention.

[0033] Figure 5 This is a perspective view schematically illustrating the bushing in a motor according to an embodiment of the present invention.

[0034] Figure 6 This is a cross-sectional perspective view schematically illustrating the bushing in a motor according to an embodiment of the present invention.

[0035] Figure 7 This is a schematic cross-sectional view showing the core and locating pin used in manufacturing the retainer in the motor according to an embodiment of the present invention.

[0036] Figure 8 This is a schematic side sectional view of an existing motor.

[0037] (Symbol Explanation)

[0038] 1. Motor

[0039] 10 stators

[0040] 11 Iron core

[0041] 111 Outer stator core

[0042] 1111 Outer stator core section

[0043] 1112 Bottom of outer stator core

[0044] 1113 External stator core pole teeth

[0045] 112 Inner Stator Core

[0046] 1121 Inner stator core ring

[0047] 1122 Inner stator core pole teeth

[0048] 12 Winding frame

[0049] 121 First winding frame

[0050] 122 Second winding frame

[0051] 13 coils

[0052] 131 First coil

[0053] 132 Second coil

[0054] 20 rotors

[0055] 21 Retaining element

[0056] 211 Maintenance Department

[0057] 2111 The receiving part

[0058] 212 Bearing Section

[0059] 2121 Protruding shoulder

[0060] 22 Magnets

[0061] 23 Bushing

[0062] 231 Annular portion

[0063] 2311 Plane

[0064] 232 Elastic part

[0065] 233 Chimeric part

[0066] 234 Contact part

[0067] 30 Output shaft

[0068] 40 Gear Set

[0069] 50 connectors

[0070] 51 Connector Terminals

[0071] 52 Connector Housing

[0072] 60 end plate

[0073] 70 partitions

[0074] 80 leaf spring

[0075] 90 Support shaft

[0076] H1 storage hole

[0077] H2 connection hole

[0078] ST Step Surface

[0079] CP core

[0080] LP locating pin

[0081] L axis of rotation

[0082] L1 axial side

[0083] The other side of L2 axis Detailed Implementation

[0084] Below, in conjunction with Figures 1 to 7 The motor according to an embodiment of the present invention will be described.

[0085] For ease of explanation, the rotation axis of the motor rotor is defined as L, the extension direction of the rotation axis of the rotor, i.e., one side in the axial direction, is defined as L1, and the other side in the axial direction is defined as L2.

[0086] Incidentally, unless otherwise specified, the terms "circumferential", "outer circumference", "inner circumference" and "radial" in this article are based on the rotor's axis of rotation.

[0087] (Overall structure of the motor)

[0088] like Figure 2 As shown, the motor 1 includes: a support shaft 90; and a rotor 20, which is supported by the support shaft 90 in a manner that allows it to rotate relative to the support shaft 90.

[0089] Here, as Figure 2 As shown, the motor 1 also includes a stator 10, and the rotor 20 is held at the center of the stator 10 via a support shaft 90.

[0090] In addition, such as Figure 2 As shown, the motor 1 also includes an output shaft 30 and a gear set 40, and the rotation of the rotor 20 is transmitted to the output shaft 30 via the gear set 40.

[0091] In addition, such as Figure 1 and Figure 2 As shown, the motor 1 also includes a connector 50, through which the motor 1 is connected to an external power source to operate.

[0092] In addition, such as Figure 1 and Figure 2 As shown, the motor 1 also includes an end plate 60, which forms part of the housing of the motor 1 and is penetrated by the output shaft 30.

[0093] In addition, such as Figure 2 As shown, the motor 1 also has a partition 70, which is disposed inside the housing of the motor 1 and has a through hole in the center for the support shaft 90 to pass through.

[0094] In addition, such as Figure 2 As shown, the motor 1 also has a leaf spring 80, which is located axially between the stator 10 and the rotor 20 and applies force to the rotor 20 axially.

[0095] (stator)

[0096] like Figure 2 As shown, the stator 10 forms part of the housing of the motor 1.

[0097] Here, as Figure 2 As shown, the stator 10 has an iron core 11, a winding frame 12, and a coil 13. The coil 13 is supported on the iron core 11 via the winding frame 12.

[0098] In addition, such as Figure 2 As shown, the core 11 includes an outer stator core 111 and an inner stator core 112. The outer stator core 111 forms part of the housing of the motor 1 and is generally a bottomed cylindrical shape with an opening on the other side L2 in the axial direction. The outer stator core 111 includes: an outer stator core cylindrical portion 1111, which is cylindrical with the rotation axis L of the rotor 20 as the center; an outer stator core bottom 1112, which blocks the opening on the other side L1 in the axial direction of the outer stator core cylindrical portion 1111; and outer stator core pole teeth 1113, which stand upright from the outer stator core bottom 1112 towards the other side L2 in the axial direction and are spaced apart from the rotor 20 on the outer peripheral side. The inner stator core 112 includes: an inner stator core ring portion 1121, which is disposed inside the outer stator core cylinder portion 1111 at a distance L2 from the outer stator core bottom portion 1112 in the axial direction; and inner stator core pole teeth 1122, which stand upright from the inner periphery of the inner stator core ring portion 1121 towards the axial direction L1, and are spaced apart from the rotor 20 on the outer periphery. A retaining hole is formed at the center of the outer stator core bottom portion 1112 for the end of the axial direction L1 of the support shaft 90 to be inserted.

[0099] In addition, such as Figure 2As shown, the winding frame 12 includes a first winding frame 121 and a second winding frame 122. The first winding frame 121 and the second winding frame 122 are arranged axially within an annular space enclosed by the outer stator core 111 and the inner stator core 112. The first winding frame 121 has a cylindrical portion coaxial with the outer stator core cylindrical portion 1111 and flange portions extending outwardly from both sides of the cylindrical portion in the axial direction. Similarly, the second winding frame 122 has a cylindrical portion coaxial with the outer stator core cylindrical portion 1111 and flange portions extending outwardly from both sides of the cylindrical portion in the axial direction. Furthermore, the second winding frame 122 is located on the opposite side L2 in the axial direction of the first winding frame 121, and abuts against the first winding frame 121 from the opposite side L2 in the axial direction. The flange portion on one side L1 of the first winding frame 121 abuts against the bottom 1112 of the outer stator core from the opposite side L2 in the axial direction. The flange portion on the other side of the second winding frame 122 abuts against the inner stator core ring portion 1121 from one side L1 in the axial direction.

[0100] In addition, such as Figure 2 As shown, coil 13 includes a first coil 131 and a second coil 132. The first coil 131 is wound on a first winding frame 121 (specifically, the cylindrical portion of the first winding frame 121). Similarly, the second coil 132 is wound on a second winding frame 122 (specifically, the cylindrical portion of the second winding frame 122).

[0101] (rotor)

[0102] like Figure 2 As shown, the rotor 20 is held within the housing of the motor 1 via a support shaft 90.

[0103] Here, as Figure 2 As shown, the rotor 20 has a retainer 21, a magnet 22, and a bushing 23. The retainer 21 is rotatably fitted onto the support shaft 90. The magnet 22 is held on the outside of the retainer 21. The bushing 23 is fixed inside the retainer 21. One axial side L1 of the retainer 21 is supported on the support shaft 90 via the bushing 23, and the other axial side L2 is supported on the support shaft 90.

[0104] In addition, such as Figures 2 to 4As shown, the retainer 21 has a retaining portion 211 and a bearing portion 212. The retaining portion 211 is located on one axial side L1 of the retainer 21. A bushing 23, which abuts against the support shaft 90, is fixed to one axial side L1 within the retaining portion 211. That is, the retaining portion 211 is supported on the support shaft 90 via the bushing 23. The bearing portion 212 is located on the other axial side L2 of the retainer 21. The inner circumferential surface of the bearing portion 212 is radially separated from the outer circumferential surface of the support shaft 90 by a small gap, which can be filled with lubricating oil or the like. The radial gap between the inner circumferential surface of the bearing portion 212 and the outer circumferential surface of the support shaft 90 is much smaller than the radial gap between the inner circumferential surface of the retaining portion 211 and the outer circumferential surface of the support shaft 90. The retainer 21 is supported by the support shaft 90 via the bearing portion 212 and is rotatable. Furthermore, a magnet 22 is provided on the outer circumferential surface of the retaining portion 211 and is cylindrical in shape. Furthermore, the bushing 23 has an annular portion 231 and an elastic portion 232. The annular portion 231 surrounds the support shaft 90. The elastic portion 232 protrudes from the annular portion 231 toward the other side L2 in the axial direction, and at least its front end (i.e., the end of the other side L2 in the axial direction) is capable of elastic deformation in the radial direction. The bushing 23 abuts against the support shaft 90 only at the front end of the elastic portion 232 (i.e., the end of the other side L2 in the axial direction) (i.e., the front end of the elastic portion 232 protrudes further inward than the rest of the elastic portion 232).

[0105] Specifically, such as Figures 2 to 6 As shown, the retaining portion 211 of the retainer 21 is generally cylindrical, extending axially. Inside the retaining portion 211, there is an abutting portion 2111, which the bushing 23 abuts against from one axial side L1. The bearing portion 212 is adjacent to the retaining portion 211 on the other axial side L2. A gear portion that meshes with the primary gear in the gear set 40 is formed on the outer periphery of the other axial side L2 of the bearing portion 212. The bearing portion 212 is formed to a position closer to the axial side L1 than the partition 70. Furthermore, the annular portion 231 of the bushing 23 has a plane 2311 on its outer periphery of the other axial side L2, which abuts against the abutting portion 2111 inside the retaining portion 211 from one axial side L1. The outer peripheral surface of the annular portion 231 is spaced apart from the inner peripheral surface of the retaining portion 211 (specifically, the inner peripheral surface of the large-diameter hole of the receiving hole H1 described below). The end of the other side L2 of the elastic part 232 in the axial direction overlaps radially with the center of the magnet 22 in the axial direction (for example, the distance between the center of the magnet 22 and the center position in the axial direction is less than 1 / 4, preferably less than 1 / 5, of the axial length of the magnet 22).

[0106] More specifically, the retaining portion 211 has: a cylindrical body extending axially; and flange portions extending outward from both axial sides of the body to clamp the magnet 22 from both axial sides. The end face of the other axial side L2 of the retaining portion 211 is perpendicular to the axial direction and flush with the end face of the other axial side L2 of the magnet 22. A receiving hole H1 and a connecting hole H2 are formed within the cylindrical body. The receiving hole H1 extends from the end of one axial side L1 of the retaining portion 211 toward the other axial side L2 and is used to receive the bushing 23. The receiving hole H1 includes a large-diameter hole and a small-diameter hole located on the other axial side L2 of the large-diameter hole, and a stepped portion constituting the abutting portion 2111 is formed between the large-diameter hole and the small-diameter hole. The connecting hole H2 extends from the receiving hole H1 towards the bearing portion 212 on the axially upward side L2. Between the connecting hole H2 and the bearing portion 212, another stepped surface ST facing the axially upward side L1 is formed. The connecting hole H2 is a tapered hole centered on the rotation axis L, with its diameter decreasing towards the axially upward side. The portion of the retaining portion 211 corresponding to the connecting hole H2 in the axial direction is formed continuously radially throughout the entire circumference. The bearing portion 212 is cylindrical with an outer diameter smaller than the main body of the retaining portion 211. In the axial direction, the end of the bearing portion 212 on the axially upward side L1 is located near the end face of the retaining portion 211 on the axially upward side L2, that is, near the end face of the magnet 22 on the axially upward side L2 (in the illustrated example, the end face of the bearing portion 212 on the axially upward side L1 is flush with the end face of the magnet 22 on the axially upward side). An annular shoulder 2121 protruding outward is formed on the outer periphery of the bearing portion 212 adjacent to the retaining portion 211.

[0107] In addition, such as Figures 2 to 6As shown, the bushing 23 is integrally formed. In the bushing 23, the two end faces of the annular portion 231 in the axial direction are planes perpendicular to the axial direction. A chamfer is formed at the end of one side L1 of the inner circumferential surface of the annular portion 231 in the axial direction. The elastic portion 232 includes a plurality of elastic pieces (three in the illustrated example, but it could also be two, or more than four) evenly spaced in the circumferential direction. The front end of the elastic piece (the end of the other side L2 in the axial direction) protrudes further inward than the rest of the elastic piece. The end of the other side L2 in the axial direction of the elastic portion 232 overlaps radially with the middle portion in the axial direction of the magnet 22. The bushing 23 also has a fitting portion 233. The fitting portion 233 protrudes from the annular portion 231 toward the axially upward side L2, spaced apart from the elastic portion 232 on the radially outer side, forming an annulus around the support shaft 90, and its protrusion is smaller than that of the elastic portion 232 (for example, less than 1 / 2, preferably less than 1 / 3). The bushing 23 is fixed to the retaining portion 211 by pressing the fitting portion 233 into the inner circumferential surface of the retaining portion 211 (specifically, the inner circumferential surface of the small-diameter hole of the receiving hole H1). The bushing 23 also has an abutment portion 234, which protrudes from the inner circumferential side portion of the end face of the annular portion 231 toward the axially upward side L1, with its front end protruding further toward the axially upward side L1 than the magnet 22 and the retaining portion 211.

[0108] (Output axis)

[0109] like Figure 1 and Figure 2 As shown, the output shaft 30 passes through the housing of the motor 1.

[0110] Here, as Figure 1 and Figure 2 As shown, the output shaft 30 extends axially through the end plate 60. Furthermore, the end of the output shaft 30 on one axial side L1 is housed in the housing of the motor 1, while the end of the other axial side L2 protrudes from the housing of the motor 1 to the outside.

[0111] (Gear set)

[0112] like Figure 2 As shown, the gear set 40 is installed inside the housing of the motor 1.

[0113] Here, as Figure 2 As shown, the gear set 40 includes multiple gears, which are supported by multiple support shafts extending axially to enable rotation. The two ends of the multiple support shafts are fixed to the end plate 60 and the partition plate 70, respectively.

[0114] In addition, such as Figure 2As shown, among the multiple gears in the gear set 40, the primary gear meshes with the gear section provided on the outer periphery of the bearing section 212 of the rotor 20, and the final gear is fixed on one side L1 of the output shaft 30 in the axial direction and rotates integrally with the output shaft 30.

[0115] (Connector)

[0116] like Figure 1 and Figure 2 As shown, connector 50 is located on a portion of the circumferential direction of stator 10.

[0117] Here, as Figure 2 As shown, connector 50 has connector terminals 51 and connector housing 52. One end of connector terminal 51 is electrically connected to coil 13 of stator 10, and the other end is used for external electrical connection. Connector housing 52 covers connector terminal 51 from the outer peripheral side.

[0118] (End plate)

[0119] like Figure 1 and Figure 2 As shown, the end plate 60, together with the outer stator core 111 and the connector housing 52, constitutes the housing of the motor 1.

[0120] Here, as Figure 1 and Figure 2 As shown, end plate 60 blocks the opening on the other side L2 of the bottom cylinder section formed by the outer stator core 111.

[0121] In addition, such as Figure 1 and Figure 2 As shown, a retaining groove is formed in the center of the end plate 60 for the end of the other side L2 of the support shaft 90 to be embedded and fixed.

[0122] In addition, such as Figure 1 and Figure 2 As shown, a through hole for the output shaft 30 to pass through is formed at a position off-center from the end plate 60.

[0123] In addition, such as Figure 1 and Figure 2 As shown, a mounting portion protruding outward is formed on the outer periphery of the end plate 60.

[0124] (partition)

[0125] like Figure 2 As shown, the partition 70 is disposed inside the housing, dividing the interior of the motor 1 housing into a space for the main body of the stator 10 and rotor 20 and a space for the gear set 40.

[0126] Here, as Figure 2As shown, the partition 70 extends perpendicularly to the axial direction. The main bodies of the stator 10 and rotor 20 are located on one side L1 of the partition 70 along the axial direction, and the gear set 40 is located on the other side L2 of the partition 70 along the axial direction. A through hole for the retaining member 21 to pass through is provided in the center of the partition 70. Multiple fixing portions are formed on the outer periphery of this through hole, which are used to fix the end of the support shaft on one side L1 along the axial direction that supports the multiple gears of the gear set 40. The partition 70 abuts against the inner stator core 112 (specifically, the inner stator core ring portion 1121) from the other side L2 along the axial direction.

[0127] (Leaf spring)

[0128] like Figure 2 As shown, the leaf spring 80 is located axially between the stator 10 and the rotor 20, and is fixed relative to the stator 10.

[0129] Here, as Figure 2 As shown, the leaf spring 80 is located axially between the bottom 1112 of the outer stator core and the bushing 23. It abuts against the bushing 234 from one axial side L1 and applies force to the bushing 23 towards the other axial side L2. A through hole is formed in the center of the leaf spring 80 for the support shaft 90 to pass through axially.

[0130] Furthermore, as the rotor 20 rotates, the abutment portion 234 of the bushing 23 slides on the leaf spring 80.

[0131] (Main effects of this implementation method)

[0132] According to the motor 1 of this embodiment, the retainer 21 has a bearing portion 212 on the other side L2 in the axial direction, and is supported by the support shaft 90 via the bearing portion 212 so that it can rotate. A bushing 23 is fixed on one side L1 in the axial direction within the retainer 211. The bushing 23 has an annular portion 231 surrounding the support shaft 90 and an elastic portion 232 that protrudes from the annular portion 231 toward the other side L2 in the axial direction and can be elastically deformed in the radial direction at least at the front end. It only abuts against the support shaft 90 at the front end of the elastic portion 232. Therefore, it can suppress the collision between the retainer 21 and the support shaft 90 when the motor 1 is working, thereby suppressing the noise during operation. In addition, it is easy to bring the abutment portion of the bushing 23 and the support shaft 90 close to the middle part in the axial direction of the magnet 22, thereby reducing the deviation of the force generated by the deformation of the elastic portion 232 and stably suppressing the collision between the retainer 21 and the support shaft 90.

[0133] Furthermore, in the motor 1 according to this embodiment, a stepped surface ST facing the axially upward side L1 is formed between the connecting hole H2 of the retaining part 211 and the bearing part 212. Therefore, when the retaining member 21 is manufactured by resin molding, as Figure 7As shown, even if a locating pin LP needs to be axially inserted through the center of the core CP used for forming the connecting hole H2, it can be ensured that the end of the core CP on the other side of the axial direction has sufficient thickness, thereby ensuring the strength of the core CP and ensuring the coaxiality of the openings of the center hole of the core CP on both sides of the axial direction. Furthermore, it is not necessary to provide a hole or the like that is recessed from the end face of the other side L2 of the axial direction of the retaining part 211 toward the side L1 of the axial direction, thereby reducing the wall thickness of the other side L2 of the axial direction of the retaining part 211, suppressing shrinkage cavities caused by excessive wall thickness during resin molding, and making molding easier.

[0134] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above embodiments.

[0135] For example, in the above embodiments, the materials of the support shaft 90, the retainer 21 and the bushing 23 are not limited; they can be metal, resin or other materials.

[0136] Furthermore, in the above embodiment, the portion of the retainer 21 that corresponds to the connecting hole H2 in the axial direction is formed continuously in the radial direction throughout the circumference, but it is not limited to this. The portion of the retainer 211 that corresponds to the connecting hole H2 in the axial direction may also have a recess that is recessed from the end face of the other side L2 in the axial direction.

[0137] Furthermore, in the above embodiment, in the axial direction, the end of one side L1 of the bearing portion 212 is located near the end face of the other side of the magnet 22 in the axial direction, but it is not limited to this. The end of one side L1 of the bearing portion 212 in the axial direction may also be located away from the end face of the other side L2 in the axial direction relative to the end face of the other side L2 in the axial direction of the magnet 22.

[0138] Furthermore, in the above embodiment, the connecting hole H2 is a tapered hole with a smaller diameter on the axial side, but it is not limited to this. The connecting hole H2 can also be formed with a constant diameter in the axial direction.

[0139] Furthermore, in the above embodiments, the magnet 22 may also be embedded in the retaining part 211, and the magnet 22 may also be formed in multiple pieces.

[0140] Furthermore, in the above embodiments, the bushing 23 is integrally formed, but it is not limited to this and may also be composed of separate parts.

[0141] Furthermore, in the above embodiment, the outer peripheral surface of the annular portion 231 is spaced apart from the inner peripheral surface of the retaining portion 211, but it is not limited to this, and the two may also abut in the radial direction.

[0142] Furthermore, in the above embodiment, a chamfer is formed at the end of one side L1 of the inner circumferential surface of the annular portion 231 in the axial direction, but it is not limited to this and the chamfer may not be formed.

[0143] Furthermore, in the above embodiment, the elastic part 232 includes a plurality of elastic sheets that are equally spaced in the circumferential direction, but it is not limited to this, and the elastic part 232 may also be an elastic ring.

[0144] Furthermore, in the above embodiment, the protrusion of the fitting portion 233 from the annular portion 231 toward the other side L2 in the axial direction is smaller than the protrusion of the elastic portion 232, but it is not limited to this. The protrusion of the fitting portion 233 may also be formed to be less than or equal to the protrusion of the elastic portion 232.

[0145] Furthermore, in the above embodiment, the fitting portion 233 is in the shape of an annulus surrounding the support shaft 90, but it is not limited to this and may also be formed intermittently in the circumferential direction.

[0146] Furthermore, in the above embodiment, the bushing 23 has an abutment portion 234, but it is not limited to this and the abutment portion 234 may be omitted.

[0147] Furthermore, in the above embodiment, the two end faces of the annular portion 231 of the bushing 23 in the axial direction are planes perpendicular to the axial direction, but it is not limited to this and may also be inclined relative to the axial direction.

[0148] Furthermore, in the above embodiment, during assembly, it is preferable to pass the support shaft 90 through the bushing 23 from one axial side L1. This allows the support shaft 90 to pass through the bushing 23 easily, while simultaneously preventing large stresses from acting on the elastic part 232, which could damage the elastic part 232 or weaken its deformation characteristics.

[0149] Furthermore, in the above embodiment, the outer peripheral portion of the end face of the axial side L1 of the annular portion 231 of the bushing 23 can be used as the mounting portion of the suction arm, thereby facilitating the automation of manufacturing.

[0150] It should be understood that within the scope of this invention, the various parts of the embodiments can be freely combined, or the various parts of the embodiments can be appropriately modified or omitted.

Claims

1. A motor, comprising: Support shaft; And a rotor having a retainer and a magnet, the retainer being rotatably fitted onto the support shaft and having a retaining portion on one side in the axial direction for retaining the magnet, characterized in that... The retainer has a bearing portion on the other side in the axial direction, and is supported by the support shaft via the bearing portion to enable rotation. A bushing is fixed on one side of the retaining part in the axial direction. The bushing has an annular portion surrounding the support shaft and an elastic portion protruding axially from the annular portion on the other side, with at least its front end capable of elastic deformation in the radial direction, and abuts against the support shaft only at the front end.

2. The motor as described in claim 1, characterized in that, The end of the elastic part on the other side in the axial direction overlaps radially with the middle part in the axial direction of the magnet.

3. The motor as described in claim 1, characterized in that, The bushing has a fitting portion that protrudes from the annular portion axially toward the other side, spaced apart from the elastic portion on the radially outer side, and the protrusion is smaller than that of the elastic portion. The bushing is fixed to the retaining part by pressing the fitting part into the inner circumferential surface of the retaining part.

4. The motor as described in claim 1, characterized in that, In the axial direction, one end of the bearing portion is located near the end face of the other side of the magnet in the axial direction.

5. The motor as described in claim 1, characterized in that, The retaining part has a receiving hole and a connecting hole. The receiving hole extends from one axial end of the retaining part toward the other axial side and is used to receive the bushing. The connecting hole extends from the receiving hole to the bearing portion on the axially upward side. A stepped surface facing axially upwards is formed between the connecting hole and the bearing portion.

6. The motor as described in claim 5, characterized in that, The connecting hole is a tapered hole centered on the rotation axis of the rotor, with its diameter decreasing towards the axial direction.

7. The motor as described in claim 5, characterized in that, The portion of the retainer corresponding to the connecting hole in the axial direction is formed continuously radially throughout the circumference.

8. The motor as claimed in claim 1, characterized in that, The retaining part is provided with an abutting part, which is abutted by the plane of the outer peripheral side of the annular part from one side in the axial direction.

9. The motor as claimed in claim 1, characterized in that, A chamfer is formed at one end of the inner circumferential surface of the annular portion on one side in the axial direction.

10. The motor as claimed in claim 1, characterized in that, The support shaft is made of metal. The bushing is made of resin. The magnet is disposed on the outer peripheral surface of the retaining part and is cylindrical in shape. The end of the elastic part on the other side in the axial direction overlaps radially with the center of the magnet in the axial direction. The elastic part includes a plurality of elastic sheets arranged at equal intervals in the circumferential direction. The bushing has a fitting portion that protrudes axially from the annular portion and surrounds the support shaft, spaced apart radially from the elastic portion. The bushing is fixed to the retaining part by pressing the fitting part into the inner circumferential surface of the retaining part. The retaining portion has an abutting portion inside, which allows the outer periphery of the annular portion to abut from one side in the axial direction. The bushing has an abutting portion that protrudes from the inner circumferential side of the annular portion toward the axially upward side, which is greater than the magnet and the retaining portion. The outer peripheral surface of the annular portion is spaced apart from the inner peripheral surface of the retaining portion. The outer peripheral portion of one side of the end face of the annular part is perpendicular to the axial direction.

11. The motor as claimed in claim 1, characterized in that, The motor has a housing. The rotor is held within the housing via the support shaft. A partition and a gear set are also provided inside the outer casing. The partition plate is provided with a through hole for the retaining member to pass through axially. The gear set is located on the other side of the partition in the axial direction. The bearing portion has a gear portion on its outer peripheral side that meshes with one of the gears in the gear set, and is positioned on the side axially higher than the partition.

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