Motor with brake

Abstract

To provide a motor with a brake that can inhibit oil of a bearing from adhering to a friction member inside the brake.SOLUTION: A motor 1 with a brake according to the disclosure includes: a yoke 3; a brake disc 7 including a friction part; a rotating member 10 configured to support the brake disc 7; a bearing 11 which supports the rotating member 10 on the yoke 3 so that the rotating member 10 may rotate around a rotation axis L; an oil adsorbent 60; and an oil scraper ring 50 provided between the oil adsorbent 60 and the bearing 11 in a direction of the rotation axis L. The bearing 11 includes an inner ring 11a and an outer ring 11b, the oil scraper ring 50 extends from an inner ring 11a side in such a manner as to cover a gap between the inner ring 11a and the outer ring 11b. An inner peripheral surface of the yoke 3 is provided with an oil guide surface 32 facing the oil scraper ring 50, and the oil adsorbent 60 is provided in an oil reservoir space A formed by the oil guide surface 32, the oil scraper ring 50, and the rotating member 10.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a braked motor. [Background technology]

[0002] Patent Document 1 discloses a motor with a brake having a structure for discharging oil to the outside when it leaks from a bearing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-171127 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to provide a motor with a brake that can prevent bearing oil from adhering to friction members inside the brake. [Means for solving the problem]

[0005] A brake-equipped motor according to one aspect of the present disclosure includes: York and A brake disc including a friction portion; A rotating member supporting the brake disc; a bearing that supports the rotating member on the yoke so as to be rotatable about a rotation axis; An oil sorbent; an oil thrower ring provided between the oil adsorbent and the bearing in the direction of the rotation axis; having The bearing has an inner ring and an outer ring, the oil thrower ring extends from the inner ring side so as to cover a gap between the inner ring and the outer ring, An oil guide surface facing the oil thrower ring is provided on an inner peripheral surface of the yoke, A motor with a brake, wherein the oil adsorbent is provided in an oil pool space formed between the oil guide surface, the oil thrower ring, and the rotating member. Effect of the Invention

[0006] According to the above, it is possible to provide a motor with a brake that can suppress adhesion of bearing oil to the friction members inside the brake. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a cross-sectional view illustrating an example of a brake-equipped motor according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is an enlarged cross-sectional view of a brake-equipped motor according to an embodiment of the present disclosure. [Diagram 3] FIG. 3 is an enlarged cross-sectional view of a brake-equipped motor according to another embodiment of the present disclosure. [Figure 4] FIG. 4 is an enlarged cross-sectional view of a brake-equipped motor according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] [Details of the embodiment of the present disclosure] Specific examples of the brake-equipped motor according to the embodiment of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0009] Fig. 1 is a cross-sectional view showing an example of a motor with a brake according to an embodiment of the present disclosure. As shown in Fig. 1, the motor with a brake 1 according to the embodiment of the present disclosure 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 a rotation axis L by a motor (not shown). The rotating member 10 is connected to an output shaft of the motor. The rotating member 10 is rotatable relative to the yoke 3. The bearing 11 rotatably supports the rotating member 10 on the yoke 3. The bearing 11 has an inner ring 11a, an outer ring 11b, and a rolling element 11c, and the rolling element 11c is provided between the inner ring 11a and the outer ring 11b. A lubricant such as grease, which is an oil or fat, is applied between the inner ring 11a and the rolling element 11c and between the outer ring 11b and the rolling element 11c to reduce the coefficient of friction between the members.

[0011] The yoke 3 houses a current-carrying coil 4 and a coil spring 5. The inner plate 6 has a through hole through which a pin 8 passes. The pin 8 allows the inner plate 6 to move in the direction of the rotation axis L but not to rotate around the rotation axis L. The brake disc 7 is not fixed to the rotating member 10, and is capable of rotating about the rotation axis L in contact with a hub 12 fixed to the rotating member 10. 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 shoe) having a high friction coefficient is provided on the outer periphery of the brake disc 7.

[0012] In the brake-equipped motor 1 according to the present disclosure, the inner plate 6 can be moved in the direction of the rotation axis L by the excitation force of the coil 4 and the spring force of the coil spring 5. As a result, when the coil 4 is not energized, the inner plate 6 abuts against the brake disc 7 by the spring force of the coil spring 5. The braking force generated by this is transmitted to the rotating member 10, generating a brake 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. The inner plate 6 and the yoke 3 are attracted to each other by the excitation force of the coil 4, but the positional relationship between the inner plate 6 and the yoke 3 is determined by the spacer 13. As a result, when energized, no braking force acts on the rotating member 10, and the rotating member 10 can rotate freely.

[0013] Fig. 2 is an enlarged cross-sectional view of the brake-equipped motor 1 according to the embodiment of the present disclosure. As shown in Fig. 2, the brake-equipped motor 1 according to the present disclosure further includes an oil thrower ring 50 and an oil adsorbent 60 capable of adsorbing lubricating oil.

[0014] As shown in Fig. 2, 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. An oil pool space A is formed by the oil guide surface 32, the oil thrower ring 50, and the rotating member 10. The oil adsorbent 60 is provided in this oil pool space A. More specifically, a support portion 31 is provided at an end of the oil guide surface 32 on the opposite side to 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 thrower ring 50 in the direction of the rotation axis L. An oil adsorbent 60 is attached to this support surface 33. In the illustrated example, the support surface 33 is provided on the opposite side to the bearing 11 in the direction of the rotation axis L of the oil pool space A. The oil adsorbent 60 is positioned in the oil pool space A by attaching the oil adsorbent 60 to this support surface 33.

[0015] The oil thrower ring 50 is provided between the rotating member 10 and the bearing 11, and is a disk-shaped member extending in the radial direction of the rotating member 10. The oil thrower ring 50 is provided so as to cover the gap between the inner ring 11a and the outer ring 11b of the bearing 11. The oil thrower ring 50 is sandwiched between the inner ring 11a and the rotating member 10, and is provided so as to be rotatable together with the rotating member 10.

[0016] The oil thrower ring 50 has an edge portion 51 that 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 is configured to extend so as to approach the oil guide surface 32 of the yoke 3 to an extent that the guided lubricating oil can be attached to the oil guide surface 32 of the yoke 3. In this embodiment, as shown in FIG. 2, a part of the edge portion 51 is inclined toward the rotation axis L in order to facilitate the guidance of the lubricating oil.

[0017] Next, the manner in which the brake-equipped motor 1 according to this embodiment suppresses leakage of the lubricating oil will be described in detail. The lubricating oil applied inside the bearing 11 is pressed against the outer ring 11b by centrifugal force. When the outer ring 11b is no longer able to hold the lubricating oil, the lubricating oil mainly leaks out from between the inner ring 11a and the outer ring 11b of the bearing 11, as shown by the arrow in FIG. 2. The edge portion 51 of the oil thrower ring 50 receives the lubricating oil leaking from the bearing 11. The oil thrower ring 50 rotates together with the rotating member 10. Therefore, the lubricating oil received by the edge portion 51 flows toward the radial end of the edge portion 51 by centrifugal force. The radial end of the oil thrower ring 50 extends radially outward to the vicinity of the oil guide surface 32 so as to guide the lubricating oil to the oil guide surface 32. Therefore, the lubricating oil flowed to the edge portion 51 by centrifugal force adheres to the oil guide surface 32. In this manner, the lubricating oil leaking from the bearing 11 is guided to the oil guide surface 32 by the oil thrower ring 50.

[0018] When the lubricating oil is guided to the oil guide surface 32, the lubricating oil adhering to the oil guide surface 32 gradually flows toward the oil adsorbent 60 along the direction of the rotation axis L. The oil adsorbent 60 adsorbs the lubricating oil guided from the bearing 11 by the oil thrower ring 50 and the oil guide surface 32 in the manner described above. In this way, the lubricating oil is guided to the oil pool space A by the oil thrower ring 50 and the oil guide surface 32. In this oil pool space A, the lubricating oil that has flowed down the oil guide surface 32 is adsorbed by the oil adsorbent 60 attached to the support surface 33 of the support part 31 that is continuous with the oil guide surface 32. In this way, the lubricating oil can be efficiently adsorbed by the oil adsorbent 60, so that the lubricating oil leaking from the bearing 11 can be prevented from flowing out to the brake disc 7 through the rotating member 10.

[0019] In the brake-equipped motor 1 of the present disclosure, the oil thrower ring 50 extends from the inner ring 11a side so as to cover the gap between the inner ring 11a and the outer ring 11b, and the inner surface 30 of the yoke 3 is provided with an oil guide surface 32 facing the oil thrower ring 50, and an oil absorbent material 60 is provided in the oil pool space A formed between the oil guide surface 32, the oil thrower ring 50, and the rotating member 10. According to this configuration, the oil thrower ring 50 close to the bearing 11 can prevent the lubricating oil from leaking out from the bearing 11 toward the brake disc 7. In this manner, with the brake-equipped motor 1 according to the present disclosure, a brake-equipped motor capable of suppressing adhesion of lubricating oil to the brake disc 7 can be provided.

[0020] Furthermore, in the brake-equipped motor 1 according to the present disclosure, the oil adsorbent 60 is disposed at a position separated from the rotating member 10. This makes it possible to reduce wear of the oil adsorbent 60 caused by the rotation of the rotating member 10. With the above configuration, the life of the oil adsorbent 60 is extended, and the generation of wear powder caused by the wear of the oil adsorbent 60 can be suppressed.

[0021] Furthermore, in the motor with brake 1 according to the present disclosure, the oil adsorbent 60 is made of felt or sponge. This allows the oil adsorbent 60 to be manufactured by an inexpensive method such as punching, thereby reducing the cost of the motor with brake 1.

[0022] Furthermore, in the brake-equipped motor 1 according to the present disclosure, the yoke 3 has a support portion 31 extending radially inward from the oil guide surface 32, and the oil adsorbent 60 is provided on the support portion 31. The oil adsorbent 60 is a substantially ring-shaped member. The support portion 31 supports the axial end face of the ring-shaped oil adsorbent 60, and therefore makes it easy to support the oil adsorbent 60.

[0023] Thus far, the motor with brake 1 according to the present disclosure has been described, but the present disclosure is not limited to the above-mentioned configuration. For example, the motor with brake 1 may further include an auxiliary oil adsorbent 61 as shown in Fig. 3. Also, the motor with brake 1 may further include an auxiliary oil thrower ring 52 as shown in Fig. 4. By including the auxiliary oil adsorbent 61 and the auxiliary oil thrower ring 52 described above, it is possible to provide a motor with brake 1 that can further suppress adhesion of oil from the bearing to the brake disc.

[0024] Although not specifically mentioned in the above-described embodiment, the inner circumferential surface 30 of the yoke 3 may be inclined toward the rotation axis L in order to facilitate the flow of the lubricating oil to the oil adsorbent 60.

[0025] Although the embodiment of the present disclosure has been described above, it goes without saying that the technical scope of the present disclosure should not be interpreted as being limited by the description of the present embodiment. The present embodiment is merely an example, and it is understood by those skilled in the art that various modifications of the embodiment are possible within the scope of the invention described in the claims. The technical scope of the present disclosure should be determined based on the scope of the invention described in the claims and its equivalents. [Explanation of symbols]

[0026] 1 Motor with brake 2 Bracket 3. York 4 Coils 6 Inner plate 7 Brake discs 8-pin 9 Outer plate 10 Rotating member 11 Bearings 11a Inner Circle 11b Outer ring 11c Rolling elements 12. Hub 13 Spacer 30 Inner surface 31 Support part 32 Oil guiding surface 33 Support surface 50 Oil Squeezer Ring 51 Edge 52 Auxiliary oil draining ring 60 Oil adsorbent 61 Auxiliary oil adsorbent

Claims

1. York and A brake disc including a friction portion; A rotating member supporting the brake disc; a bearing that supports the rotating member on the yoke so as to be rotatable about a rotation axis; An oil sorbent; an oil thrower ring provided between the oil adsorbent and the bearing in the direction of the rotation axis; having The bearing has an inner ring and an outer ring, the oil thrower ring extends from the inner ring side so as to cover a gap between the inner ring and the outer ring, An oil guide surface facing the oil thrower ring is provided on an inner peripheral surface of the yoke, A motor with a brake, wherein the oil adsorbent is provided in an oil pool space formed between the oil guide surface, the oil thrower ring, and the rotating member.

2. The brake-equipped motor according to claim 1 , wherein the oil adsorbent is disposed at a position spaced apart from the rotating member.

3. 3. The brake-equipped motor according to claim 1, wherein the oil absorbent material is made of felt or sponge.

4. The yoke has a support portion extending radially inward from the oil guide surface, The brake-equipped motor according to claim 1 or 2, wherein the oil adsorbent is fixed to the support portion.

5. The braked motor further comprises an auxiliary oil sorbent; 3. The braked motor according to claim 1, wherein the oil adsorbent is disposed between the auxiliary oil adsorbent and the oil thrower ring.

Images