Brake device and buffer member

Abstract

To obtain a brake device 8 and a buffer member 100 that allow a buffer part 110 to be easily replaced, and allow the generation of a contact sound to be restrained when a field 10 and an armature 20 come into contact with each other.SOLUTION: A brake device 8 comprises a field 10, an electromagnetic coil 80, an armature 20, a biasing part 70, and a buffer member 100. The field 10 comprises a first surface 11 and a second surface 12. A hole 16 penetrating to the second surface 12 from the first surface 11 is formed. The buffer member 100 is formed so as to be insertable into the hole 16 toward the first surface 11 from the second surface 12. A buffer part 110 is arranged at one end. The buffer member is arranged in the hole 16 so that when the armature 20 approaches the first surface 11, the armature 20 comes into contact with the buffer part 110.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a brake device and a buffer member. [Background technology]

[0002] In a conventional brake device, a buffer part, a collar, and a pressing rod are accommodated in a housing chamber formed in a field. When the armature moves from a braking position to an allowable position, the pressing rod moves integrally with the armature and indirectly contacts the buffer part via the collar. The buffer part suppresses the generation of noise when the field and the armature contact each other. In addition, by removing a lid that opens and closes the opening of the housing chamber, the buffer part can be replaced without disassembling the brake device (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-100450 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional brake devices described above, the buffer part can be easily replaced, but because the buffer part does not come into direct contact with the armature, there was a problem in that it was difficult to suppress the generation of contact noise when the field and the armature come into contact.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a brake device and a buffer member that allow the buffer part to be easily replaced and that can suppress the generation of contact noise when the field and the armature come into contact with each other. [Means for solving the problem]

[0006] The brake device according to the present disclosure comprises: a field having a first surface and a second surface, with a hole formed therein penetrating from the first surface to the second surface; an electromagnetic coil provided in the field; an armature arranged opposite the first surface and approaching the first surface when current is applied to the electromagnetic coil; a biasing portion arranged between the armature and the field and biasing the armature in a direction away from the first surface; and a buffer member formed so as to be insertable into the hole from the second surface toward the first surface, with a buffer portion arranged at one end, and arranged in the hole so that the armature contacts the buffer portion when the armature approaches the first surface.

[0007] The cushioning member disclosed herein is a cushioning member for use in a brake device having a field having a first surface and a second surface, with a hole formed therein that penetrates from the first surface to the second surface, an electromagnetic coil provided in the field, an armature arranged opposite the first surface and approaching the first surface when current is applied to the electromagnetic coil, and a biasing portion arranged between the armature and the field for biasing the armature in a direction away from the first surface, the cushioning member being formed so as to be insertable into the hole from the second surface toward the first surface, with a cushioning portion arranged at one end, and being arranged in the hole so that the armature comes into contact with the cushioning portion when the armature moves in a direction approaching the first surface. Effect of the Invention

[0008] The brake device and buffer member according to the present disclosure enable easy replacement of the buffer portion, and also makes it possible to suppress the generation of contact noise when the field and the armature come into contact with each other. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a front view of an elevator hoisting machine in a first embodiment. [Diagram 2] FIG. 1 is a side view of an elevator hoisting machine in a first embodiment. [Diagram 3] 1 is a cross-sectional view of a brake device according to a first embodiment. [Figure 4]FIG. 2 is a perspective view of a cushioning member according to the first embodiment. [Diagram 5] 1 is a cross-sectional view of a brake device according to a first embodiment. [Figure 6] 1 is a cross-sectional view of a brake device according to a first embodiment. [Figure 7] 1 is a cross-sectional view of a brake device according to a first embodiment. [Figure 8] 1 is a cross-sectional view of a brake device according to a first embodiment. [Figure 9] FIG. 11 is a perspective view of a buffer member showing a modified example of the first embodiment. [Figure 10] FIG. 11 is a perspective view of a buffer member showing a modified example of the first embodiment. [Figure 11] FIG. 4 is a cross-sectional view of a brake device showing a modified example of the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Embodiment 1 The brake device 8 according to the first embodiment will be described in detail below. Note that the same reference numerals in the various drawings represent the same or equivalent configurations.

[0011] 1 and 2, the brake device 8 is provided, for example, in an elevator hoisting machine 1. The elevator hoisting machine 1 is fixed to an upper part of a machine base 2 and supported by the machine base 2.

[0012] The elevator hoisting machine 1 includes a sheave 3, a brake disc 4, a rotating shaft 5, a motor 6, a bearing stand 7, and a brake device 8.

[0013] A main rope (not shown) is wound around the outer circumferential surface of the sheave 3. The sheave 3 is fixed to the rotating shaft 5 so as to rotate integrally with the rotating shaft 5.

[0014] The brake disc 4 is formed in a disk shape. The brake disc 4 is fixed to the sheave 3 and rotates integrally with the sheave 3. When the brake disc 4 is braked by the braking device 8, the sheave 3 is braked.

[0015] One end of the rotating shaft 5 is rotatably supported by a motor 6, and the other end is rotatably supported by a bearing stand 7. The motor 6 rotates the sheave 3 and the brake disc 4 via the rotating shaft 5.

[0016] The brake device 8 brakes the rotation of the sheave 3 by braking the rotation of the brake disc 4. For example, two brake devices 8 are provided. The two brake devices 8 are respectively attached to mounting portions 7a of the bearing base 7 extending in the left-right direction on the paper surface of FIG.

[0017] Fig. 3 shows a cross-sectional view of the brake device 8 at the A-A' cross section of the elevator hoisting machine 1 in Fig. 1. The brake device 8 includes a field 10, an armature 20, brake pads 31, 32, a brake shaft 40, a connecting member 50, a spring 60, a spring 70 which is a biasing part, an electromagnetic coil 80, a guide part 90, and a buffer member 100.

[0018] The field 10 is made of a magnetic material and is disposed opposite the armature 20. The field 10 is made of a magnetic material, such as steel. The field 10 has a first surface 11 and a second surface 12. The first surface 11 is a surface facing the armature 20. The second surface 12 is a surface on the opposite side of the armature 20 in a direction parallel to the direction from the armature 20 to the field 10. In the following description, the direction parallel to the direction from the armature 20 to the field 10 is also referred to as the left-right direction. The direction from the armature 20 to the field 10 is also referred to as the right direction, and the direction from the field 10 to the armature 20 is also referred to as the left direction.

[0019] The field 10 is attached to the mounting portion 7a of the bearing stand 7 so as to be movable in the left-right direction.

[0020] In the first surface 11, a spring storage hole 13 for storing the spring 70, a coil storage groove 14 for storing the electromagnetic coil 80, and a guide portion storage hole 15 for storing the guide portion 90 are formed.

[0021] The spring storage hole 13 is a recess recessed to the right. There are two spring storage holes 13. In the spring storage hole 13, one end of the spring 70 is stored.

[0022] The coil accommodating groove 14 is a groove formed in an annular shape along the first surface 11. In the coil accommodating groove 14, an electromagnetic coil 80 is accommodated.

[0023] The guide portion storage hole 15 is a recess recessed to the right. There are two guide portion storage holes 15. In the guide portion storage holes 15, one end of the guide portion 90 is stored.

[0024] A hole 16 is formed in the field 10, penetrating from the first surface 11 to the second surface 12. The hole 16 is formed so that its cross section in the depth direction of the paper surface of FIG. 3 is circular. The hole 16 has a small hole 16a and a large hole 16b. The small hole 16a and the large hole 16b are connected to each other. The inner diameter of the small hole 16a is smaller than the inner diameter of the large hole 16b. The small hole 16a is formed closer to the armature 20 than the large hole 16b.

[0025] The armature 20 is made of a magnetic material. The armature 20 is made of a magnetic material, for example, steel. The armature 20 has a third surface 21 and a fourth surface 22. The third surface 21 is a surface facing the first surface 11 of the field 10. The fourth surface 22 is a surface on the opposite side to the field 10 in the left-right direction.

[0026] A guide portion storage hole 23 for storing the guide portion 90 is formed in the third surface 21. The guide portion storage hole 23 is a recess recessed to the left. Two guide portion storage holes 23 are provided. The other end of the guide portion 90 is stored in the guide portion storage hole 23.

[0027] The brake pads 31, 32 are disposed facing the brake disc 4 so as to sandwich the brake disc 4 from the left-right direction. The brake pad 31 is disposed closer to the armature 20 than the brake pad 32 in the left-right direction. The brake pad 31 is connected to the armature 20 via a brake shaft 40. The brake pad 32 is connected to the field 10 via a connecting member 50.

[0028] One end of the brake shaft 40 is connected to the brake pad 31, and the other end is connected to the armature 20. The brake pad 31 and the brake shaft 40 move integrally with the armature 20.

[0029] The connecting member 50 connects the brake pad 32 and the field 10. The brake pad 32 and the connecting member 50 move integrally with the field 10. The connecting member 50 has an extending portion 51 that extends in a direction perpendicular to the left-right direction.

[0030] The spring 60 is disposed between the extension portion 51 and the bearing base 7 in the left-right direction. One end of the spring 60 is fixed to the extension portion 51, and the other end of the spring 60 is fixed to the bearing base 7. The spring 60 is, for example, a compression coil spring. The spring 60 may be a leaf spring. Instead of the spring 60, rubber, urethane foam, or the like may be used.

[0031] Two springs 70 are provided and are disposed between the armature 20 and the field 10 in the left-right direction. One end of the spring 70 is stored in the spring storage hole 13. One end of the spring 70 contacts the bottom surface of the spring storage hole 13, and the other end of the spring 70 contacts the third surface 21 of the armature 20. The spring 70 biases the armature 20 and brings the brake pad 31 into contact with the brake disc 4. The spring 70 is, for example, a compression coil spring. The spring 70 may be a leaf spring. Furthermore, rubber, urethane foam, or the like may be used as the biasing portion.

[0032] The electromagnetic coil 80 is provided in the field 10. More specifically, the electromagnetic coil 80 is housed in the coil housing groove 14 of the field 10.

[0033] The guide portion 90 is a member that guides the movement of the armature 20 in the left-right direction. Two guide portions 90 are provided and are disposed between the field 10 and the armature 20 in the left-right direction. One end of the guide portion 90 is stored in the guide portion storage hole 15, and the other end of the guide portion 90 is stored in the guide portion storage hole 23.

[0034] The cushioning member 100 is formed so as to be insertable into the hole 16 from the second surface 12 toward the first surface 11. The cushioning member 100 is placed in the hole 16 and fixed to the field 10 with a screw (not shown). The cushioning member 100 is formed, for example, in a rod shape.

[0035] As shown in FIG. 4, the cushioning member 100 has a cushioning portion 110, a support portion 120, and a flange portion .

[0036] The buffer portion 110 is disposed at one end of the buffer member 100. As shown in FIG. 5, when the buffer member 100 is disposed in the hole 16, the buffer portion 110 protrudes, for example, 0.5 mm from the first surface 11 of the field 10. The buffer portion 110 suppresses the generation of impact and contact sound when the field 10 and the armature 20 contact each other. The buffer portion 110 is, for example, rubber, and is formed in a ring shape. Note that the buffer portion 110 only needs to suppress either one of the impact and the generation of contact sound when the field 10 and the armature 20 contact each other. In addition, the length by which the buffer portion 110 protrudes from the first surface 11 is not limited to 0.5 mm. The buffer member 100 only needs to be disposed in the hole 16 so that the armature 20 contacts the buffer portion 110 when the armature 20 approaches the first surface 11.

[0037] The support section 120 is made of a magnetic material and is formed into a cylindrical shape. It is more preferable that the support section 120 is made of the same magnetic material as the field 10. One end of the support section 120 has a protrusion 121 that protrudes upward in the plane of FIG. 4. The buffer section 110 is supported by the support section 120 by fitting into the protrusion 121 of the support section 120.

[0038] The flange 130 is disposed at the other end of the buffer member 100. The flange 130 is annular and protrudes from the support portion 120 in the radial direction of the support portion 120. The flange 130 is formed from a magnetic material. It is more preferable that the flange 130 is formed from the same magnetic material as the field 10. The flange 130 may be integrally formed with the support portion 120. The outer diameter of the flange 130 is larger than the inner diameter of the small hole 16a. Therefore, when the buffer member 100 is inserted into the hole 16 from the second surface 12 toward the first surface 11 and disposed in the hole 16, the flange 130 cannot enter the small hole 16a. In other words, the flange 130 restricts the buffer member 100 from moving in a direction approaching the armature 20 by contacting the field 10. In addition, the outer diameter of the flange 130 is smaller than the inner diameter of the large hole 16b. Therefore, when the buffer member 100 is placed in the hole 16, the flange 130 is placed in the large hole 16b.

[0039] Next, the operation of the braking device 8 will be described.

[0040] 5, 6, and 7, an operation of the brake device 8 when transitioning from a state in which the brake device 8 brakes the rotation of the brake disc 4 to a state in which the brake device 8 does not brake the rotation of the brake disc 4. In the following description, the state in which the brake device 8 brakes the rotation of the brake disc 4 is also referred to as a braking state, and the state in which the brake device 8 does not brake the rotation of the brake disc 4 is also referred to as a non-braking state.

[0041] 5, when the electromagnetic coil 80 is not energized, the brake device 8 is in a braking state. At this time, the brake pad 31 is biased by the spring 70 via the armature 20 and is in contact with the brake disc 4. In addition, the brake pad 32 is in contact with the brake disc 4.

[0042] When the electromagnetic coil 80 is energized, the field 10 is magnetized. Then, as shown in FIG. 6, the field 10 moves leftward, that is, toward the armature 20. In other words, when the electromagnetic coil 80 is energized, the third surface 21 of the armature 20 relatively approaches the first surface 11 of the field 10. Then, the armature 20 comes into contact with the buffer section 110. After that, the field 10 moves further leftward, and the first surface 11 comes into contact with the third surface 21 of the armature 20. At this time, the buffer section 110 suppresses the generation of impact and contact noise when the field 10 and the armature 20 come into contact with each other.

[0043] When the field 10 moves leftward, the brake pad 32 and the connecting member 50 also move leftward, and the brake pad 32 moves away from the brake disc 4. At this time, the spring 60 is stretched, and a force acts in the direction in which the spring 60 contracts.

[0044] As shown in FIG. 7, the spring 60 contracts, causing the connecting member 50 to move to the right. In conjunction with this movement, the brake pad 32 and the field 10 also move to the right. At this time, the field 10 is magnetized, so the field 10 attracts the armature 20. Therefore, when the field 10 moves to the right, the armature 20 also moves to the right. Furthermore, in conjunction with the movement of the armature 20, the brake pad 31 and the brake shaft 40 also move to the right. When the brake pad 31 moves to the right, the brake pad 31 moves away from the brake disc 4, and the brake device 8 enters a non-braking state.

[0045] Next, the operation of the brake device 8 when it transitions from a non-braking state to a braking state will be described with reference to FIGS.

[0046] When the braking device 8 is in a non-braking state, if the supply of electricity to the electromagnetic coil 80 is stopped, the magnetic force of the field 10 disappears. When the magnetic force of the field 10 disappears, the armature 20 is biased by the spring 70, and the armature 20 moves leftward, as shown in FIG. 8 . In conjunction with this movement, the brake shaft 40 and the brake pad 31 also move leftward. Then, the brake pad 31 comes into contact with the brake disc 4. At this time, the third surface 21 of the armature 20 moves away from the first surface 11 of the field 10.

[0047] As the spring 70 expands, the field 10 is biased and moves to the right. In conjunction with this movement, the connecting member 50 and the brake pad 32 move to the right. Then, as shown in FIG. 5, the brake pad 32 comes into contact with the brake disc 4, and the brake device 8 enters a braking state.

[0048] When the brake device 8 repeatedly transitions between a braking state and a non-braking state, the buffer portion 110 may wear due to contact with the armature 20. The work of replacing the buffer portion 110 by an operator when the buffer portion 110 has worn out will be described with reference to Fig. 5. Note that the buffer portion 110 may be replaced regardless of whether the buffer portion 110 has worn out or not.

[0049] First, the worker loosens the screws (not shown) that secure the buffer member 100 to the field 10, and pulls the buffer member 100 to the right out of the hole 16. That is, the buffer member 100 is pulled out in the direction from the first surface 11 to the second surface 12.

[0050] Next, the worker removes the worn bumper 110 from the protrusion 121 and fits a new bumper 110 onto the protrusion 121 .

[0051] Finally, the worker inserts the buffer member 100 into the hole 16 toward the left. That is, the buffer member 100 is inserted into the hole 16 from the second surface 12 toward the first surface 11. After placing the buffer member 100 in the hole 16, the worker fixes the buffer member 100 to the field 10 with a screw.

[0052] The brake device 8 according to the first embodiment includes a field 10 in which a hole 16 is formed penetrating from the first surface 11 to the second surface 12, and a buffer member 100 that is formed so as to be insertable into the hole 16 from the second surface 12 toward the first surface 11, has a buffer section 110 disposed at one end, and is disposed in the hole 16 so that the armature 20 comes into contact with the buffer section 110 when the armature 20 approaches the first surface 11 of the field 10. With this configuration, the buffer member 100 can be pulled out of the hole 16 without disassembling the brake device 8, and the buffer member 100 can be inserted into the hole 16. Therefore, the buffer section 110 disposed at one end of the buffer member 100 can be easily replaced. Disassembly of the brake device 8 includes removing the field 10 from the mounting section 7a of the bearing stand 7, and the like. Furthermore, since the buffer member 100 is disposed in the hole 16 so that the buffer portion 110 is in direct contact with the armature 20, the generation of impact and contact noise when the field 10 and the armature 20 come into contact with each other can be suppressed.

[0053] The buffer member 100 according to the first embodiment is formed so as to be insertable into the hole 16 from the second surface 12 toward the first surface 11, and has a buffer section 110 disposed at one end thereof, which is disposed in the hole 16 so that the armature 20 comes into contact with the buffer section 110 when the armature 20 approaches the first surface 11 of the field 10. As described above, the buffer section 110 disposed at one end of the buffer member 100 can be easily replaced. Also, the generation of impact and contact noise when the field 10 and the armature 20 come into contact with each other can be suppressed.

[0054] Furthermore, in the brake device 8 according to the first embodiment, the buffer member 100 has a support portion 120 that supports the buffer portion 110, and the support portion 120 is made of a magnetic material. In general, the magnetic permeability of a magnetic material is greater than that of a non-magnetic material. Therefore, compared to the case where the support portion 120 made of a non-magnetic material is placed in the hole 16, the magnetic force generated in the field 10 can be made greater when the support portion 120 made of a magnetic material is placed in the hole 16.

[0055] Furthermore, in the brake device 8 according to the first embodiment, the buffer member 100 has a flange 130. When the buffer member 100 is placed in the hole 16, the flange 130 comes into contact with the field 10 to restrict the buffer member 100 from moving in a direction approaching the armature 20. Therefore, every time an operator inserts the buffer member 100 from the second surface 12 toward the first surface 11, the buffer member 100 can be stopped at the same position. For example, if the position is set to a position where the buffer portion 110 protrudes 0.5 mm from the first surface 11 of the field 10, the position of the buffer member 100 can be easily adjusted.

[0056] Furthermore, in the brake device 8 according to the first embodiment, the buffer unit 110 is supported by the support unit 120 by fitting the buffer unit 110 to the protruding portion 121. The buffer unit 110 can also be supported by the support unit 120 using an adhesive without fitting the buffer unit 110 to the support unit 120. However, if an adhesive is applied between the buffer unit 110 and the support unit 120, the thickness of the adhesive may not be uniform, causing the buffer unit 110 to tilt with respect to the axial direction of the support unit 120. On the other hand, the buffer unit 110 can be supported by the support unit 120 without using an adhesive by fitting the buffer unit 110 to the support unit 120. Therefore, the buffer unit 110 can be prevented from tilting with respect to the axial direction of the support unit 120.

[0057] Although an example in which two braking devices 8 are provided has been described, one or three or more braking devices 8 may be provided.

[0058] 9, a convex portion 111 may be provided on the buffer portion 110, and a concave portion 122 may be provided on the support portion 120. The buffer portion 110 may be supported by the support portion 120 by fitting the convex portion 111 of the buffer portion 110 into the concave portion 122 of the support portion 120.

[0059] 10, the buffer section 110 may be formed in a cylindrical shape, and the support section 120 may not have the protrusion 121. The buffer section 110 may be supported by the support section 120 by applying an adhesive between the buffer section 110 and the support section 120.

[0060] The support portion 120 and the flange portion 130 may be made of a non-magnetic material. The buffer portion 110, the support portion 120 and the flange portion 130 may be integrally formed of a material having a buffer property such as rubber.

[0061] A male thread, which is a first thread, may be formed on the outer peripheral surface of the support portion 120, and a female thread, which is a second thread that meshes with the male thread of the support portion 120, may be formed on the inner peripheral surface of the field 10. In the case of such a configuration, the buffer member 100 is moved in the left-right direction by rotating the support portion 120, and the distance between the buffer portion 110 and the armature 20 is adjusted. Therefore, the position of the buffer member 100 can be stably changed depending on the amount of rotation of the support portion 120. In addition, the position of the buffer member 100 can be finely adjusted.

[0062] It is not necessary for the hole 16 to have the large hole 16b. In this case, when the buffer member 100 is placed in the hole 16, the flange portion 130 contacts the second surface 12 of the field 10.

[0063] 11, the second surface 12 may be a surface adjacent to the first surface 11. In this case, the hole 16 extends in a direction inclined with respect to the left-right direction.

[0064] The brake device 8 may be a disc brake or a drum brake.

[0065] In the explanation of the operation of the braking device 8, an example has been given in which the armature 20 approaches relatively closer to the first surface 11 of the field 10 as a result of the movement of the field 10. Depending on the type or mechanism of the braking device 8, the armature 20 may approach the first surface 11 of the field 10 as a result of the movement of the armature 20. Also, the armature 20 may approach the first surface 11 of the field 10 as a result of the movement of the field 10 and the armature 20. In other words, the armature 20 approaching the first surface 11 includes the armature 20 approaching relatively closer to the first surface 11 as a result of the movement of at least one of the field 10 and the armature 20.

[0066] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) a field having a first surface and a second surface, the field having a hole extending from the first surface to the second surface; An electromagnetic coil provided in the field; an armature disposed opposite the first surface and approaching the first surface when the electromagnetic coil is energized; a biasing portion disposed between the armature and the field and biasing the armature in a direction away from the first surface; a buffer member that is formed so as to be insertable into the hole from the second surface toward the first surface, has a buffer portion disposed at one end, and is disposed in the hole such that the armature comes into contact with the buffer portion when the armature approaches the first surface; A braking device comprising: (Appendix 2) The buffer member has a support portion that supports the buffer portion, 2. The brake device according to claim 1, wherein the support portion is made of a magnetic material. (Appendix 3) 3. The brake device of claim 2, wherein the support portion is formed from the same material as the field. (Appendix 4) The buffer member has a support portion that supports the buffer portion, A first thread is formed on an outer circumferential surface of the support portion, 4. The brake device according to any one of claims 1 to 3, wherein a second thread is formed on an inner circumferential surface of the hole, the second thread engaging with the first thread. (Appendix 5) 5. The brake device according to any one of claims 1 to 4, wherein the buffer member has a flange portion that contacts the field when the buffer member is disposed in the hole to limit movement of the buffer member in a direction toward the armature. (Appendix 6) The brake device according to any one of claims 2 to 5, wherein the buffer portion is supported by the support portion by being fitted into the support portion. (Appendix 7) A buffer member for use in a brake device, comprising: a field having a first surface and a second surface, the field having a hole formed therein penetrating from the first surface to the second surface; an electromagnetic coil provided in the field; an armature disposed to face the first surface and approaching the first surface when current is applied to the electromagnetic coil; and a biasing portion disposed between the armature and the field and biasing the armature in a direction away from the first surface, a buffer member formed so as to be insertable into the hole from the second surface toward the first surface, having a buffer portion disposed at one end, and disposed in the hole so that the armature comes into contact with the buffer portion when the armature moves in a direction approaching the first surface. [Explanation of symbols]

[0067] 1 elevator hoist, 2 machine base, 3 sheave, 4 brake disc, 5 rotating shaft, 6 motor, 7 bearing base, 7a mounting portion, 8 brake device, 10 field, 11 first surface, 12 second surface, 13 spring storage hole, 14 coil storage groove, 15 guide portion storage hole, 16 hole, 16a small hole, 16b large hole, 20 armature, 21 third surface, 22 fourth surface, 23 guide portion storage hole, 31 brake pad, 32 brake pad, 40 brake shaft, 50 connecting member, 51 extension portion, 60 spring, 70 spring, 80 electromagnetic coil, 90 guide portion, 100 cushioning member 100 cushioning portion, 120 support portion, 121 protrusion portion, 130 flange portion

Claims

1. a field having a first surface and a second surface, the field having a hole extending from the first surface to the second surface; An electromagnetic coil provided in the field; an armature disposed opposite the first surface and approaching the first surface when the electromagnetic coil is energized; a biasing portion disposed between the armature and the field and biasing the armature in a direction away from the first surface; a buffer member that is formed to be insertable into the hole from the second surface toward the first surface, has a buffer portion disposed at one end, and is disposed in the hole such that the armature comes into contact with the buffer portion when the armature approaches the first surface; A braking device comprising:

2. The buffer member has a support portion that supports the buffer portion, The brake device according to claim 1 , wherein the support portion is made of a magnetic material.

3. 3. The brake device according to claim 2, wherein the support portion is formed from the same material as the field.

4. The buffer member has a support portion that supports the buffer portion, A first thread is formed on an outer circumferential surface of the support portion, 2. The brake device according to claim 1, wherein a second thread is formed on an inner peripheral surface of the hole so as to mesh with the first thread.

5. The brake device according to any one of claims 1 to 4, wherein the buffer member has a flange portion that contacts the field to limit movement of the buffer member in a direction approaching the armature when the buffer member is placed in the hole.

6. The brake device according to claim 2 , wherein the buffer portion is supported by the support portion by being fitted into the support portion.

7. A buffer member for use in a brake device, comprising: a field having a first surface and a second surface, the field having a hole formed therein penetrating from the first surface to the second surface; an electromagnetic coil provided in the field; an armature disposed to face the first surface and approaching the first surface when current is applied to the electromagnetic coil; and a biasing portion disposed between the armature and the field and biasing the armature in a direction away from the first surface, a buffer member formed so as to be insertable into the hole from the second surface toward the first surface, having a buffer portion disposed at one end, and disposed in the hole so that the armature comes into contact with the buffer portion when the armature moves in a direction approaching the first surface;

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