Motor with brake

Abstract

The invention provides a motor with a brake. The motor with the brake is provided with the components of a brake disc which comprises a friction part; a rotating member that supports the brake disc; a bearing; a yoke that supports the rotating member so as to be rotatable about a rotation axis via the bearing; an oil adsorption material; and an oil slinger provided between the oil absorbing material and the bearing in the direction of the rotational axis, the bearing having an inner ring and an outer ring, the oil slinger extending from the inner ring side so as to cover a gap between the inner ring and the outer ring, an oil guide surface provided on the inner circumferential surface of the yoke facing the oil slinger, and an oil guide surface provided on the outer circumferential surface of the yoke facing the oil slinger. The oil adsorption material is provided in an oil storage space formed by the oil guide surface, the slinger, and the rotating member.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is based on Japanese Patent Application No. 2023-150101 filed with the Japan Patent Office on September 15, 2023, and all the contents of the Japanese patent application are hereby incorporated by reference. Technical Field

[0001] The invention relates to a motor with a brake. Background Art

[0002] Japanese Patent Application Laid-Open No. 2020-171127 discloses a motor with a brake having a structure for discharging leaked oil to the outside when oil in a bearing leaks. Summary of the invention

[0004] An object of the present invention is to provide a motor with a brake that can suppress the oil of a bearing from adhering to a friction member inside the brake. A motor with a brake comprises: a brake disc including a friction portion; a rotating component supporting the brake disc; a bearing; a yoke supporting the rotating component via the bearing so as to be rotatable around a rotation axis; an oil adsorbing material; and an oil deflecting ring arranged between the oil adsorbing material and the bearing in the direction of the rotation axis, the bearing comprising an inner ring and an outer ring, the oil deflecting ring extending from the inner ring side in a manner covering a gap between the inner ring and the outer ring, an oil guiding surface facing the oil deflecting ring being arranged on the inner peripheral surface of the yoke, and the oil adsorbing material being arranged in an oil storage space formed by the oil guiding surface, the oil deflecting ring and the rotating component. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a cross-sectional view showing an example of a motor with a brake according to an embodiment of the present invention. Figure 2 It is an enlarged cross-sectional view of a motor with a brake according to an embodiment of the present invention. Figure 3 This is an enlarged cross-sectional view of a motor with a brake according to another embodiment of the present invention. Figure 4 This is an enlarged cross-sectional view of a motor with a brake according to another embodiment of the present invention. DETAILED DESCRIPTION In the detailed description below, for the purpose of illustration, in order to provide a thorough understanding of the disclosed embodiments, many specific details are set forth. However, it is apparent that one or more embodiments may be implemented without these specific details. In other cases, in order to simplify drawing, well-known structures and devices are schematically shown.

[0005] A motor with a brake in one embodiment of the present invention comprises: a motor with a brake comprises: a brake disc including a friction portion; a rotating component supporting the brake disc; a bearing; a yoke supporting the rotating component via the bearing so as to be rotatable around a rotation axis; an oil adsorbing material; and an oil retaining ring arranged between the oil adsorbing material and the bearing in the direction of the rotation axis, the bearing comprising an inner ring and an outer ring, the oil retaining ring extending from the inner ring side in a manner covering a gap between the inner ring and the outer ring, an oil guiding surface facing the oil retaining ring being arranged on the inner peripheral surface of the yoke, and the oil retaining material being arranged in an oil storage space formed by the oil guiding surface, the oil retaining ring and the rotating component.

[0006] According to the above-described motor with a brake, it is possible to provide a motor with a brake capable of suppressing the oil of the bearing from adhering to the friction member inside the brake.

[0008] [Details of the embodiments of the present invention] Hereinafter, a specific example of a motor with a brake according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the technology of the present invention is not limited to these examples. It is intended that the technology of the present invention includes the technology represented by the scope of the claims and all changes within the meaning and scope equivalent to the scope of the claims.

[0009] Figure 1 1 is a cross-sectional view showing an example of a motor with a brake according to an embodiment of the present invention. Figure 1 As shown, the motor with brake 1 according to the embodiment of the present invention has a bracket 2, a rotating member 10 and a bearing 11. Inside the bracket 2, a yoke 3, an inner plate 6, an outer plate 9, a brake disc 7, a pin 8, a hub 12 and a spacer 13 are provided.

[0010] The rotating member 10 is rotated around the rotation axis L by a motor not shown. The rotating member 10 is connected to the output shaft of the motor. The rotating member 10 is rotatable relative to the yoke 3. The bearing 11 is arranged between the yoke 3 and the rotating member 10. The yoke 3 supports the rotating member 10 via the bearing 11 so as to be rotatable around the rotation axis L. That is, the bearing 11 supports the rotating member 10 rotatably on the yoke 3. The bearing 11 has an inner ring 11a, an outer ring 11b and a rolling element 11c. The rolling element 11c is provided between the inner ring 11a and the outer ring 11b. Lubricating oil such as grease as a grease component is applied between the inner ring 11a and the rolling element 11c and between the outer ring 11b and the rolling element 11c in order to reduce the friction coefficient between the components.

[0011] The yoke 3 accommodates the coil 4 for conducting electricity and the coil spring 5. The inner plate 6 has a through hole through which the pin 8 passes. The inner plate 6 is movable in the direction of the rotation axis L by the pin 8 and cannot rotate around the rotation axis L. The brake disc 7 is not fixed to the rotating member 10, but contacts the hub 12 fixed to the rotating member 10, and is rotatable about the rotation axis L. The brake disc 7 is provided between the outer plate 9 and the inner plate 6 in the direction of the rotation axis L. A friction portion (brake pad) having a high friction coefficient is provided on the outer periphery of the brake disc 7.

[0012] In the motor 1 with a brake according to the embodiment of the present invention, the inner plate 6 is configured to be movable in the direction of the rotation axis L by the excitation force of the coil 4 and the elastic force of the coil spring 5. Therefore, when the coil 4 is not energized, the inner plate 6 abuts against the brake disc 7 by the elastic force of the coil spring 5. The braking force thus generated is transmitted to the rotating member 10 via the brake disc 7 and the wheel hub 12, generating a braking torque. On the other hand, when the coil 4 is energized, the inner plate 6 is separated from the brake disc 7 by the excitation force of the coil 4 and is attracted to the yoke 3. In this way, when the inner plate 6 is attracted to the yoke 3 by the excitation force of the coil 4, the positional relationship between the inner plate 6 and the yoke 3 is determined by the spacer 13. With such a structure, in the motor 1 with a brake, when the coil 4 is energized, the braking force does not act on the rotating member 10, and the rotating member 10 can rotate freely.

[0013] Figure 2 FIG. 1 is an enlarged cross-sectional view of a motor 1 with a brake according to an embodiment of the present invention. Figure 2 As shown, the motor with brake 1 of the present invention further includes an oil slinger 50 and an oil adsorbing material 60 capable of adsorbing lubricating oil.

[0014] like Figure 2 As shown, the yoke 3 has an inner peripheral surface 30 facing the rotating member 10. The inner peripheral surface 30 has an oil guide surface 32. The oil guide surface 32, the oil slinger 50 and the rotating member 10 form an oil storage space A. The oil adsorbent 60 is provided in the oil storage space A. In more detail, a support portion 31 is provided at the end of the oil guide surface 32 on the opposite side of the bearing 11 in the direction of the rotation axis L. The support portion 31 is a convex portion that protrudes radially inward from the yoke 3. The support portion 31 has a support surface 33 that faces the oil retaining ring 50 in the direction of the rotation axis L. An oil adsorbing material 60 is mounted on the support surface 33. In the example shown in the figure, a support surface 33 is provided on the opposite side of the oil storage space A in the direction of the rotation axis L from the bearing 11. By mounting the oil adsorbing material 60 on the support surface 33, the oil adsorbing material 60 is arranged in the oil storage space A.

[0015] The oil slinger 50 is provided between the rotating member 10 and the bearing 11, and is a disc-shaped member extending in the radial direction of the rotating member 10. The oil slinger 50 is provided to cover the gap between the inner ring 11a and the outer ring 11b of the bearing 11. The oil slinger 50 is sandwiched between the inner ring 11a and the rotating member 10, and thus can rotate together with the rotating member 10.

[0016] The oil slinger 50 has an edge portion 51. The edge portion 51 can guide the lubricating oil leaking from the bearing 11 to the oil guide surface 32 of the yoke 3. The edge portion 51 extends radially toward the oil guide surface 32 of the yoke 3. The edge portion 51 extends close to the oil guide surface 32 of the yoke 3 to such an extent that the guided lubricating oil can adhere to the oil guide surface 32 of the yoke 3. Figure 2 As shown, in the present embodiment, a portion of the edge portion 51 is inclined in the direction of the rotation axis L in order to facilitate the guidance of lubricating oil.

[0017] Next, the method of suppressing the leakage of lubricating oil in the motor with brake 1 of this embodiment is described in detail. The lubricating oil applied to the inside of the bearing 11 is pressed against the outer ring 11b due to the centrifugal force. When the outer ring 11b cannot retain the lubricating oil, as shown in FIG. Figure 2 As shown by the arrow in , the lubricating oil mainly leaks out from between the inner ring 11a and the outer ring 11b of the bearing 11. The edge portion 51 of the oil retaining ring 50 receives the lubricating oil leaking from the bearing 11. The oil retaining ring 50 rotates together with the rotating component 10. Therefore, the lubricating oil received by the edge portion 51 flows toward the radial end of the edge portion 51 due to the centrifugal force. The radial end of the oil retaining ring 50 extends radially outward to the vicinity of the oil guide surface 32 to guide the lubricating oil to the oil guide surface 32. Therefore, the lubricating oil that flows to the edge portion 51 due to the centrifugal force adheres to the oil guide surface 32. In this way, the lubricating oil leaking from the bearing 11 is guided to the oil guide surface 32 by the oil retaining ring 50.

[0018] When the lubricating oil is guided to the oil guide surface 32, the lubricating oil attached to the oil guide surface 32 gradually flows along the direction of the rotation axis L toward the oil adsorbing material 60. The oil adsorbing material 60 adsorbs the lubricating oil guided from the bearing 11 by the oil slinger 50 and the oil guide surface 32 in the above-mentioned manner. In this way, the lubricating oil is guided to the oil storage space A by the oil slinger 50 and the oil guide surface 32. In the oil storage space A, the lubricating oil flowing along the oil guide surface 32 is adsorbed by the oil adsorbing material 60, which is continuous from the oil guide surface 32 and is installed on the support surface 33 of the support part 31. In this way, in the motor 1 with a brake, the lubricating oil can be effectively adsorbed by the oil adsorbing material 60. Therefore, it is possible to prevent the lubricating oil leaking from the bearing 11 from flowing to the brake disc 7 through the rotating component 10.

[0019] According to the motor with brake 1 of the embodiment of the present invention, the oil slinger 50 extends from the inner ring 11a side in a manner covering the gap between the inner ring 11a and the outer ring 11b. An oil guide surface 32 facing the oil slinger 50 is provided on the inner peripheral surface 30 of the yoke 3. An oil adsorbing material 60 is provided in the oil storage space A formed by the oil guide surface 32, the oil slinger 50 and the rotating component 10. According to this configuration, the oil slinger 50 located close to the bearing 11 can suppress the lubricating oil from leaking from the bearing 11 toward the brake disc 7 . As described above, according to the motor with brake 1 according to the embodiment of the present invention, it is possible to provide a motor with brake that can suppress the lubricating oil from adhering to the brake disk 7 .

[0020] Furthermore, according to the motor with brake 1 of the present invention, the oil adsorbing material 60 is arranged at a position away from the rotating member 10. Thus, it is possible to reduce the wear of the oil adsorbing material 60 caused by the rotation of the rotating member 10. According to the above structure, it is possible to extend the life of the oil adsorbing material 60 and suppress the generation of wear powder caused by the wear of the oil adsorbing material 60.

[0021] Furthermore, according to the motor with brake 1 of the present invention, the oil adsorbing material 60 is formed of felt or sponge. Thus, the oil adsorbing material 60 can be manufactured by an inexpensive method such as punching. Therefore, the cost of the motor with brake 1 can be reduced.

[0022] Furthermore, according to the motor with brake 1 of the present invention, the yoke 3 has a support portion 31 extending radially inward from the oil guide surface 32, and the oil adsorbing material 60 is provided on the support portion 31. The oil adsorbing material 60 is a substantially annular member. Since the support portion 31 supports the axial end surface of the annular oil adsorbing material 60, the oil adsorbing material 60 is easily supported.

[0023] So far, the motor 1 with a brake according to the embodiment of the present invention has been described. In this regard, the technology of the present invention is not limited to the above-mentioned structure. Figure 3 As shown in FIG. 1 , the motor 1 with a brake may further include an auxiliary oil adsorbing material 61. In this case, the oil adsorbing material 60 is, for example, disposed between the auxiliary oil adsorbing material 61 and the oil slinger 50. Figure 4 As shown, the motor 1 with a brake may further include an auxiliary oil slinger 52. The motor 1 with a brake may better suppress the oil of the bearing from adhering to the brake disc by including the auxiliary oil adsorbing material 61 and / or the auxiliary oil slinger 52.

[0024] Although not particularly mentioned in the above embodiment, the inner peripheral surface 30 of the yoke 3 may be inclined in the direction of the rotation axis L in order to make the lubricating oil flow toward the oil adsorbing material 60 more easily.

[0025] The above is an explanation of the embodiment of the present invention. In this regard, the technical scope of the present embodiment should certainly not be interpreted restrictively by the explanation of the above embodiment. The present embodiment is only an example, and it is understood by those skilled in the art that various changes can be made to the embodiment within the technical scope of the present invention described in the claims. The technical scope of the present invention should be determined according to the technical scope described in the claims and its equivalent scope. The detailed description has been given for the purpose of example and illustration. In light of the above teachings, many variations and changes are possible. The detailed description is not exhaustive or intended to limit the subject matter described herein. Although the subject matter has been described in words with specific structural features and / or method processes, it should be understood that the subject matter defined in the claims is not necessarily limited to the specific features or specific processes described. More specifically, the specific features and specific processes are described as examples of implementing the claims.

Claims

1. A motor with a brake, characterized in that: have: A brake disc including a friction portion; A rotating component supporting the brake disc; Bearings; a yoke that supports the rotating member via the bearing so as to be rotatable about a rotation axis; Oil absorbent material; as well as an oil slinger provided between the oil adsorbing material and the bearing in the direction of the rotation axis, The bearing has an inner ring and an outer ring, The oil slinger ring extends from the inner ring side in a manner covering the gap between the inner ring and the outer ring. An oil guide surface facing the oil slinger ring is provided on the inner peripheral surface of the yoke. The oil adsorbing material is provided in an oil storage space formed by the oil guide surface, the oil slinger, and the rotating member.

2. The motor with brake according to claim 1, characterized in that: The oil adsorbing material is arranged at a position away from the rotating member.

3. The motor with brake according to claim 1 or 2, characterized in that: The oil absorbing material may be composed of felt or sponge.

4. The motor with a brake according to claim 1 or 2, characterized in that: The yoke has a support portion extending radially inward from the oil guide surface. The oil adsorbent is fixed to the support portion.

5. The motor with brake according to claim 1 or 2, characterized in that: The motor with brake also has an auxiliary oil absorbing material. The oil absorbing material is arranged between the auxiliary oil absorbing material and the oil slinger.

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