motor

Abstract

A motor that helps suppress noise during operation. The motor of this invention includes: a support shaft; and a rotor having a retainer rotatably mounted on the support shaft relative to it. The retainer has a central portion extending axially and having a contact portion and a pressed portion. The contact portion is located at one axial end of the central portion, and the pressed portion is radially separated from the contact portion. A pressing member is mounted on the retainer, pressing the pressed portion radially inward to cause the central portion to elastically deform radially inward with its other axially positioned base, thereby allowing the contact portion to contact the support shaft while separated from the pressed portion.

Description

Technical Field

[0001] This utility model relates to motors. 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, the retainer 21X being sleeved on the support shaft 90X in a manner rotatable relative to the support shaft 90X. Furthermore, the retainer 21X has a bearing portion 212X in the entire axial direction, and is supported by the support shaft 90X via the bearing portion 212X to be rotatable.

[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. Utility Model Content

[0004] This 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 sleeved on the support shaft in a rotatable manner relative to the support shaft. The retainer has a central portion extending axially and having a contact portion and a pressed portion. The contact portion is located at one end of the central portion on one axial side. The pressed portion is separated from the contact portion radially outward. A pressing member is mounted on the retainer, pressing the pressed portion radially inward to cause the central portion to elastically deform radially inward with its base on the other axial side, thereby allowing the contact portion to contact the support shaft in a state of separation from the pressed portion.

[0006] According to the present invention, the motor has a retainer having a central portion extending axially and having a contact portion and a pressed portion. The contact portion is located at one end of the central portion on one side in the axial direction, and the pressed portion is separated from the contact portion on the radially outer side. A pressing member is mounted on the retainer, which presses the pressed portion toward the radially inner side, causing the central portion to elastically deform toward the radially inner side with the other side in the axial direction as its base. This allows the contact portion to contact the support shaft in a state where it is separated from the pressed portion. Therefore, unlike the situation where a gap is provided between the inner circumferential surface of the rotor and the outer circumferential surface of the support shaft, which may cause knocking noise during operation (when the rotor rotates) due to the increase of the gap (e.g., due to manufacturing reasons or thermal expansion during use), this helps to suppress noise caused by the impact between the retainer and the support shaft during operation. Furthermore, compared to the situation where the contact portion contacts the support shaft in a state of contact with the pressed portion, this helps to prevent the rotor from being unable to rotate relative to the support shaft.

[0007] Furthermore, in the motor of this invention, it is preferable that the pressed part is arranged continuously or intermittently around the rotation axis of the rotor, and the pressing member is a bushing sleeved on the outer peripheral surface of the pressed part.

[0008] According to the present invention, the pressed part is arranged continuously or intermittently around the rotation axis of the rotor, and the pressing member is a bushing sleeved on the outer peripheral surface of the pressed part. Therefore, the pressing member has a simple structure, is easy to manufacture, and is easy to install on the retaining member.

[0009] Furthermore, in the motor of this invention, it is preferable that the contact portions are arranged at intervals in the circumferential direction, and the pressed portion has multiple parts arranged in the circumferential direction corresponding to the multiple contact portions.

[0010] According to the motor of this utility model, the contact portions are spaced apart in the circumferential direction, so it is easy to keep the force applied by the contact portions to the support shaft in the circumferential direction balanced, thereby making the rotor rotate smoothly during operation; and the pressed portion has multiple parts that are arranged in the circumferential direction corresponding to the multiple contact portions, so the pressed portion is easy to deform in the radial direction, and it is easy to fit the pressing member onto the pressed portion.

[0011] Furthermore, in the motor of this invention, it is preferable that the pressed portion is located at the end of one side of the central portion along the axial direction.

[0012] According to the motor of this utility model, the pressed part is located at the end of one side of the central part along the axial direction. Therefore, the amount of movement of the pressing part when it is installed on the retaining part can be reduced, thereby improving the assembly efficiency.

[0013] Furthermore, in the motor of this invention, it is preferable that the contact portion is separated from the support shaft when the pressing member is not installed on the retaining member.

[0014] According to the motor of this utility model, the contact part is separated from the support shaft when the pressing part is not installed on the retaining part. Therefore, when the support shaft and the retaining part are assembled first, and then the pressing part is assembled, it is easy to sleeve the retaining part on the support shaft.

[0015] Furthermore, in the motor of this invention, it is preferable that the radial thickness of the contact portion is less than the radial thickness of the pressed portion.

[0016] According to the motor of this invention, the radial thickness of the contact portion is less than the radial thickness of the pressed portion, thus ensuring strength when pressing in the fixed pressing member.

[0017] Furthermore, in the motor of this invention, it is preferable that the end of the pressed part on one side in the axial direction is chamfered.

[0018] According to the motor of this utility model, the end of the pressing part on one side in the axial direction is chamfered, so that the pressing member can be easily fitted onto the pressing part.

[0019] Furthermore, in the motor of this invention, it is preferable that a magnet is held on the outer periphery of the retainer, the pressed portion protrudes axially from at least one of the magnet and the contact portion, and the motor has a spring that presses the pressed portion from one axial direction.

[0020] According to the present invention, a magnet is held on the outer periphery of the retainer. The pressed portion protrudes axially upward from at least one of the magnet and the contact portion. The motor has a spring that presses the pressed portion from the axially upward side. Therefore, it helps to avoid the spring from contacting the magnet and causing wear. In particular, when the pressed portion protrudes axially upward from the contact portion, it also helps to prevent the contact portion from being pressed by the spring and losing contact with the support shaft.

[0021] Furthermore, in the motor of this invention, the retainer preferably has a cylindrical portion, at least one axial side of the cylindrical portion being separated from the central portion by a gap on the radially outer side, the gap extending from the end of one axial side of the retainer toward the other axial side, the pressing member pressing into the inner circumferential surface of the cylindrical portion, forming a limiting portion on the inner circumferential surface of the cylindrical portion, the limiting portion abutting against the pressing member from the other axial side to position the pressing member axially.

[0022] According to the present invention, the motor, particularly when the gap between the central portion and the cylindrical portion is formed from one end of the retainer in the axial direction to near the other end of the cylindrical portion in the axial direction, helps to make the wall thickness of the retainer uniform in the axial direction, thereby suppressing molding defects; and, the pressing member is pressed into the inner circumferential surface of the cylindrical portion, and a limiting portion is formed on the inner circumferential surface of the cylindrical portion, which abuts against the pressing member from the other side in the axial direction to position the pressing member in the axial direction, so that the pressing member can be conveniently positioned in the radial and axial directions.

[0023] Furthermore, in the motor of this utility model, it is preferable to also include a spring and an end plate, wherein the spring presses the pressed part from one side in the axial direction, the end of the retainer on the other side in the axial direction has a rounded corner, and the end plate is used to fix the other side of the support shaft in the axial direction and has an inclined surface that is inclined relative to the axial direction and abuts against the rounded corner.

[0024] The motor according to this utility model also includes a spring and an end plate. The spring presses the pressed part from one side in the axial direction. The end of the retainer on the other side in the axial direction has a rounded corner. The end plate is fixed to the other side in the axial direction of the support shaft and has an inclined surface that is inclined relative to the axial direction and abuts against the rounded corner. Therefore, the end plate can apply a radial force to the end of the other side in the axial direction of the retainer, so that the end of the other side in the axial direction of the retainer continuously and reliably contacts the outer peripheral surface of the support shaft, further suppressing the noise generated by the impact between the retainer and the support shaft during operation.

[0025] Furthermore, in the motor of this invention, it is preferable that only the two ends of the retainer in the axial direction contact the support shaft.

[0026] According to the motor of this utility model, the retainer only contacts the support shaft on both sides in the axial direction. Therefore, it helps to avoid noise and torque reduction caused by large-area friction between the retainer and the support shaft, suppresses knocking noise caused by the unstable radial dimensions of the inner hole of the long support shaft and the retainer, and also facilitates dimensional management in the molding process.

[0027] (Utility Model Effect)

[0028] According to this utility model, the retainer has a central portion that extends axially and has a contact portion and a pressed portion. The contact portion is located at one end of the central portion on one side in the axial direction, and the pressed portion is separated from the contact portion on the radially outer side. A pressing member is mounted on the retainer, which presses the pressed portion toward the radially inner side, causing the central portion to elastically deform toward the radially inner side with the other side in the axial direction as its base. This allows the contact portion to contact the support shaft in a state where it is separated from the pressed portion. Therefore, unlike the situation where a gap is provided between the inner circumferential surface of the rotor and the outer circumferential surface of the support shaft, which may cause knocking noise during operation (when the rotor rotates) due to the increase of the gap (e.g., due to manufacturing reasons or thermal expansion during use), this helps to suppress noise caused by the retainer colliding with the support shaft during operation. Furthermore, compared to the situation where the contact portion contacts the support shaft in a state of contact with the pressed portion, this helps to prevent the rotor from being unable to rotate relative to 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 side sectional view schematically illustrating an embodiment of the motor of this utility model.

[0031] Figure 3 This is a partial side sectional view schematically illustrating an embodiment of the motor of this utility model.

[0032] Figure 4 This is a perspective view schematically showing the end plate of the motor according to an embodiment of the present invention.

[0033] Figure 5 This is another perspective view schematically illustrating the end plate of the motor according to an embodiment of the present invention.

[0034] Figure 6 This is a side sectional view schematically illustrating the assembly process of the motor according to an embodiment of the present invention, and showing the state when the pressing member is not installed on the retaining member.

[0035] Figure 7 This is a side sectional view schematically illustrating the assembly process of the motor according to an embodiment of the present invention, and showing the state when the pressing member is installed on the retaining member.

[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] 112 Inner Stator Core

[0043] 12 Winding frame

[0044] 121 First winding frame

[0045] 122 Second winding frame

[0046] 13 coils

[0047] 131 First coil

[0048] 132 Second coil

[0049] 20 rotors

[0050] 21 Retaining element

[0051] 211 Central Department

[0052] 2111 Contact Department

[0053] 2112 Pressed part

[0054] 212 cylindrical part

[0055] 2121 Limiting Part

[0056] 213 Protrusion

[0057] 2131 Rounded corners

[0058] 22 Pressing parts

[0059] 23 Magnets

[0060] 30 Output shaft

[0061] 40 Gear Set

[0062] 50 connectors

[0063] 52 Connector Housing

[0064] 60 end plate

[0065] 61 bulge

[0066] 611 Inclined Surface

[0067] 62 Retaining groove

[0068] 63 Installation Department

[0069] 70 partitions

[0070] 80 springs

[0071] 90 Support shaft

[0072] S gap

[0073] L axis of rotation

[0074] L1 axial side

[0075] The other side of L2 axis Detailed Implementation

[0076] Below, in conjunction with Figures 1 to 7 The motor of the present invention will be described.

[0077] 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.

[0078] 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.

[0079] (Overall structure of the motor)

[0080] like Figure 1 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.

[0081] Here, as Figure 2 As shown, the motor 1 also includes a stator 10, which forms part of the housing of the motor 1, and the rotor 20 is held at the center of the stator 10 via a support shaft 90.

[0082] 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.

[0083] In addition, such as Figure 1 As shown, the motor 1 also includes a connector 50, which forms part of the housing of the motor 1, and the motor 1 is connected to an external power source via the connector 50.

[0084] In addition, such as Figures 1 to 5 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.

[0085] 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.

[0086] In addition, such as Figure 2As shown, the motor 1 also has a spring 80, which is located axially between the stator 10 and the rotor 20 and applies force to the rotor 20 axially.

[0087] (stator)

[0088] like Figure 2 As shown, the stator 10 has an iron core 11, a winding frame 12 and a coil 13, with the coil 13 supported on the iron core 11 across the winding frame 12.

[0089] Here, 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 includes: a cylindrical outer stator core section centered on the rotation axis L of the rotor 20; and an outer stator core bottom that blocks the opening on one axial side L1 of the outer stator core section. At the bottom of the outer stator core, a retaining hole is formed in the center for the end of the axial side L1 of the support shaft 90 to be inserted, and outer stator core pole teeth are provided radially outward of the retaining hole, facing the other axial side L2. The inner stator core 112 is disposed inside the outer stator core 111 and includes a first inner stator core, a second inner stator core, and a third inner stator core. The first stator inner stator core includes: an inner stator core ring portion that is spaced apart from the bottom of the outer stator core on the other side L2 in the axial direction; and inner stator core pole teeth that stand upright from the inner periphery of the inner stator core ring portion towards the axial direction L1. The second stator inner stator core includes: an inner stator core ring portion that abuts against the inner stator core ring portion of the first stator inner stator core on the other side L2 in the axial direction; and inner stator core pole teeth that stand upright from the inner periphery of the inner stator core ring portion towards the axial direction L2. The third stator inner stator core includes: an inner stator core ring portion that is spaced apart from the inner stator core ring portion of the second stator inner stator core on the other side L2 in the axial direction; and inner stator core pole teeth that stand upright from the inner periphery of the inner stator core ring portion towards the axial direction L1.

[0090] In addition, such as Figure 2 As 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. The first winding frame 121 is disposed within an annular space enclosed by the outer stator core 111 and the first inner stator core. The second winding frame 122 is disposed within an annular space enclosed by the outer stator core 111, the second inner stator core, and the third inner stator core.

[0091] 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. Similarly, the second coil 132 is wound on a second winding frame 122.

[0092] (rotor)

[0093] like Figure 2 As shown, the rotor 20 has a retainer 21, which is sleeved on the support shaft 90 in a manner that allows it to rotate relative to the support shaft 90 (e.g., made of metal). Furthermore, only the two ends of the retainer 21 in the axial direction are in contact with the support shaft 90 (lubricating oil may or may not be filled between the central portion of the retainer 21 in the axial direction and the support shaft 90).

[0094] Here, as Figure 2 As shown, the rotor 20 also has a pressing member 22 and a magnet 23. The pressing member 22 is mounted on the retaining member 21, and the magnet 23 is held on the outer periphery of the retaining member 21.

[0095] In addition, such as Figure 2 , Figure 6 and Figure 7 As shown, the retainer 21 is formed of resin and has a central portion 211 extending axially and having a contact portion 2111 and a pressing portion 2112. The central portion 211 is generally cylindrical, and a central through hole for the support shaft 90 to pass through is formed in the center of the central portion 211. The contact portion 2111 is located at the end of one side L1 of the central portion 211 in the axial direction, and the pressing portion 2112 is separated from the contact portion 2111 radially outward. Furthermore, multiple contact portions 2111 are provided circumferentially (for example, three are provided at equal intervals, but not limited to this; four or more may be provided at equal intervals, two may be provided at equal intervals, or they may be provided at unequal intervals), and the pressing portion 2112 has multiple portions corresponding to the multiple contact portions 2111 in the circumferential direction. The contact portions 2111 are separated from the support shaft 90 when the pressing member 22 is not installed on the retainer 21. The radial thickness of the contact portion 2111 is less than the radial thickness of the pressed portion 2112. The pressed portion 2112 is located at the end of one axial side L1 of the central portion 211. The end of one axial side L1 of the pressed portion 2112 is chamfered. The pressed portion 2112 protrudes axially towards one axial side L1 more than the magnet 23 and at least the magnet 23 in the contact portion 2111. That is, the end face of one axial side L1 of the pressed portion 2112 is closer to one axial side L1 than the end face of one axial side L1 of the magnet 23 and at least the magnet 23 in the contact portion 2111.

[0096] In addition, such as Figure 2 , Figure 6 and Figure 7As shown, the retainer 21 also has a cylindrical portion 212, at least one axial side L1 of the cylindrical portion 212 being separated from the central portion 211 by a gap S on the radially outer side (in the illustrated example, the end of the other axial side L2 of the cylindrical portion 212 is connected to the end of the other axial side L2 of the central portion 211). Furthermore, flange portions are formed at both axial ends of the cylindrical portion 212, protruding radially outward and clamping the magnet 23 from both axial sides. A limiting portion 2121 is formed on the inner circumferential surface of the cylindrical portion 212, which abuts against the pressing member 22 from the other axial side L2 to position the pressing member 22 axially.

[0097] In addition, such as Figure 2 As shown, the retainer 21 also has a protrusion 213 that protrudes from the end of the central portion 211 on the other side L2 in the axial direction. The protrusion 213 is generally cylindrical, and a through hole for the support shaft 90 to pass through is formed in the center of the protrusion 213. The outer diameter of the protrusion 213 is smaller than the outer diameter of the central portion 211 (in the illustrated example, the protrusion 213 is a stepped shaft with a large diameter portion and a small diameter portion, the small diameter portion being closer to the other side L2 in the axial direction than the large diameter portion, and its outer diameter being smaller than that of the large diameter portion). A gear portion for meshing with the gear set 40 is formed on the outer peripheral surface of the protrusion 213. The end of the protrusion 213 on the other side L2 in the axial direction has a rounded corner portion 2131. That is, the end of the retainer 21 on the other side L1 in the axial direction has a rounded corner portion 2131.

[0098] In addition, such as Figure 6 and Figure 7 As shown, the pressing member 22 does not directly contact the support shaft 90. The pressing member 22 may be made of resin. The pressing member 22 is, for example, a bushing fitted onto the outer peripheral surface of the pressed portion 2112. When the pressing member 22 is assembled to the retainer 21, the pressing member 22 presses the pressed portion 2112 radially inward, causing the central portion 211 to elastically deform radially inward with the other axial side L2 as its base, thereby allowing the contact portion 2111 to contact the support shaft 90 in a state separated from the pressed portion 2112. The pressing member 22 is pressed into the inner peripheral surface of the cylindrical portion 212 and abuts against the limiting portion 2121 from the axial side L1.

[0099] (Output axis)

[0100] like Figure 1 As shown, the output shaft 30 passes through the housing of the motor 1.

[0101] Here, as Figure 1 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.

[0102] (Gear set)

[0103] like Figure 2 As shown, the gear set 40 is installed inside the housing of the motor 1.

[0104] 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.

[0105] In addition, such as Figure 2 As 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 protrusion 213 of the rotor 20, and the final gear is fixed to one side L1 of the output shaft 30 in the axial direction and rotates integrally with the output shaft 30.

[0106] (Connector)

[0107] like Figure 1 As shown, connector 50 is disposed in a circumferential portion of stator 10 and has connector housing 52 and terminals (not shown) located within connector housing.

[0108] (End plate)

[0109] 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.

[0110] 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.

[0111] In addition, such as Figure 2 and Figure 3 As shown, the end plate 60 is used to fix the other side L2 of the support shaft 90 in the axial direction, and has an inclined surface 611 that is inclined relative to the axial direction and abuts against the rounded corner portion 2131. Specifically, a retaining groove 62 is formed in the center of the end plate 60 for the end of the other side L2 of the support shaft 90 in the axial direction to be inserted and fixed. A protrusion 61 protruding towards the axially upward side L1 is formed on the periphery of the retaining groove 62. The protrusion 61 has an inclined surface 611.

[0112] In addition, such as Figure 1 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.

[0113] In addition, such as Figure 1 and Figure 2As shown, a mounting portion 63 protruding outward is formed on the outer periphery of the end plate 60.

[0114] (partition)

[0115] like Figure 2 As shown, the partition 70 is disposed inside the housing of the motor 1, dividing the interior of the housing of the motor 1 into a space for the main body of the stator 10 and rotor 20 and a space for the gear set 40.

[0116] Here, as Figure 2 As 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. Furthermore, a through hole for the retaining member 21 to pass through is provided in the center of the partition 70 along the axial direction. The partition 70 abuts against the third inner stator core from the other side L2 along the axial direction.

[0117] (spring)

[0118] like Figure 2 As shown, the spring 80 is located axially between the stator 10 and the rotor 20, and is fixed relative to the stator 10.

[0119] Here, as Figure 2 As shown, the spring 80 is located axially between the bottom of the outer stator core of the stator 10 and the end of the rotor 20 on one axial side L1. The spring 80 presses the pressed portion 2112 of the rotor 20 from the axial side L1. A through hole is formed in the center of the spring 80 for the support shaft 90 to pass through and fit into axially.

[0120] Furthermore, when the rotor 20 rotates, the pressed part 2112 of the rotor 20 slides on the spring 80.

[0121] (Main effects of this implementation method)

[0122] According to the motor 1 of this embodiment, the retainer 21 has a central portion 211 extending axially and having a contact portion 2111 and a pressed portion 2112. The contact portion 2111 is located at the end of one axial side L1 of the central portion 211. The pressed portion 2112 is separated from the contact portion 2111 radially outward. A pressing member 22 is mounted on the retainer 21. The pressing member 22 presses the pressed portion 2112 radially inward, causing the central portion 211 to elastically deform radially inward with the other axial side L2 as its base. This allows the contact portion 2111 to engage with the pressed portion. When the retaining member 21 is in the separated state, it contacts the support shaft 90. Therefore, unlike when there is a gap between the inner circumferential surface of the rotor 20 and the outer circumferential surface of the support shaft 90, which may cause knocking noise during operation (when the rotor rotates) due to the increase of the gap (e.g., due to manufacturing reasons or thermal expansion during use), it helps to suppress noise caused by the impact between the retaining member 21 and the support shaft 90 during operation. Furthermore, compared to the case where the contacting member 2111 contacts the support shaft 90 while in contact with the pressed member 2112, it helps to prevent the rotor 20 from being unable to rotate relative to the support shaft 90.

[0123] 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.

[0124] For example, in the above embodiment, the pressing member 22 is a bushing sleeved on the outer peripheral surface of the pressed part 2112, but it is not limited to this. The pressing member 22 may also be arc-shaped or block-shaped.

[0125] Furthermore, in the above embodiment, only the two ends of the retainer 21 in the axial direction contact the support shaft 90, but it is not limited to this. It can also be configured such that only the end of the retainer 21 on one side L1 in the axial direction contacts the support shaft 90.

[0126] Furthermore, in the above embodiment, multiple contact portions 2111 are provided at intervals in the circumferential direction, but it is not limited to this and may also be provided with only one.

[0127] Furthermore, in the above embodiment, the pressed portion 2112 has multiple portions that are provided in the circumferential direction corresponding to multiple contact portions 2111, but it is not limited to this. The pressed portion 2112 may also be continuously provided around the rotation axis L of the rotor 20.

[0128] Furthermore, in the above embodiment, the pressed part 2112 is located at the end of one side L1 of the central part 211 in the axial direction, but it is not limited to this. The pressed part 2112 may also be provided in the middle part in the axial direction of the central part 211.

[0129] Furthermore, in the above embodiment, the contact portion 2111 is separated from the support shaft 90 when the pressing member 22 is not installed on the retaining member 21, but it is not limited to this. The contact portion 2111 may also make slight contact with the support shaft 90 when the pressing member 22 is not installed on the retaining member 21.

[0130] Furthermore, in the above embodiment, the gap S may also be formed from the end of one side L1 of the retainer 21 in the axial direction to near the end of the other side L2 of the cylindrical portion 212 in the axial direction.

[0131] Furthermore, in the above embodiment, the radial thickness of the contact portion 2111 is less than the radial thickness of the pressed portion 2112, but it is not limited to this. The radial thickness of the contact portion 2111 may also be approximately equal to the radial thickness of the pressed portion 2112.

[0132] Furthermore, in the above embodiment, the end plate 60 has an inclined surface 611 that is inclined relative to the axial direction and abuts against the rounded corner portion 2131, but it is not limited to this and the inclined surface 611 may be omitted.

[0133] Furthermore, in the above embodiments, either the retainer 21 and the support shaft 90 can be assembled first, and then the pressing member 22 can be assembled, or the retainer 21 and the pressing member 22 can be assembled first, and then the support shaft 90 can be assembled.

[0134] It should be understood that within the scope of this utility model, the various parts in the embodiments can be freely combined, or the various parts in the embodiments can be appropriately modified or omitted.

Claims

1. A motor, comprising: Support shaft; And a rotor having a retainer sleeved on the support shaft in a manner rotatable relative to the support shaft, characterized in that, The retainer has a central portion extending axially and having a contact portion and a pressing portion. The contact portion is located at one end of the central portion along its axial direction, and the pressing portion is radially separated from the contact portion. A pressing member is installed on the retainer. The pressing member presses the pressed part toward the radially inward side, causing the central part to elastically deform toward the radially inward side with the other side in the axial direction as its base, so that the contact part contacts the support shaft in a state of being separated from the pressed part.

2. The motor as described in claim 1, characterized in that, The pressed portion is arranged continuously or intermittently around the rotation axis of the rotor. The pressing element is a bushing fitted onto the outer peripheral surface of the part being pressed.

3. The motor as described in claim 2, characterized in that, The contact portion is provided at intervals in the circumferential direction. The pressed portion has multiple parts that are arranged in the circumferential direction corresponding to the multiple contact portions.

4. The motor as described in claim 1, characterized in that, The pressed portion is located at one end of the central portion along its axial direction.

5. The motor as described in claim 1, characterized in that, The contact portion is separated from the support shaft when the pressing member is not installed on the retaining member.

6. The motor as claimed in claim 1, characterized in that, The radial thickness of the contact portion is less than the radial thickness of the pressed portion.

7. The motor as claimed in claim 1, characterized in that, The end of the pressed part on one side in the axial direction is chamfered.

8. The motor as claimed in claim 1, characterized in that, A magnet is held on the outer periphery of the retainer. The pressed portion protrudes axially from at least one of the magnets and the contact portion. The motor has a spring that presses the pressed part from one side in the axial direction.

9. The motor as claimed in claim 1, characterized in that, The retainer has a cylindrical portion. At least one axial side of the cylindrical portion is separated from the central portion by a gap on its radially outer side. The gap extends from one axial end of the retainer toward the other axial side. The pressing element is pressed into the inner circumferential surface of the cylindrical portion. A limiting portion is formed on the inner circumferential surface of the cylindrical portion, which abuts against the pressing member from the other side in the axial direction to position the pressing member in the axial direction.

10. The motor as claimed in claim 1, characterized in that, It also includes springs and end plates. The spring presses the pressed part from one side in the axial direction. The retainer has a rounded corner at the other end in the axial direction. The end plate is fixed to the other side of the support shaft in the axial direction and has an inclined surface that is inclined relative to the axial direction and abuts against the rounded corner.

11. The motor as claimed in claim 1 or 10, characterized in that, The retainer only has its two axial ends in contact with the support shaft.

Images