Motor with de-energized operation brake

Abstract

To provide a de-energized operation brake capable of preventing overpressure of a movable plate and avoiding breakage of the movable plate.SOLUTION: A motor with a de-energized operation brake includes: a friction plate that can engage with a rotation shaft to rotate and move in an axial direction; a movable plate arranged so as to move along the axial direction of the rotation shaft; a brake spring that presses the movable plate to the friction plate by spring energizing force; an electromagnet that electromagnetically disengages the movable plate from the friction plate; and a bolt that can be rotatingly inserted toward an inner diameter side to pressurize the movable plate so as to separate from a stationary plate, and a tapered surface of a tip of the bolt has bumps and dips.SELECTED DRAWING: Figure 4A

Description

[Technical Field]

[0001] The present invention relates to an electric motor with a non-excitation operating brake. [Background technology]

[0002] A non-excitation brake needs to be able to be manually released during maintenance, power outages, etc. As an example, Patent Document 1 discloses that by operating a manual operating unit located on the radially outer side of the motor rotating shaft, a manual loosening bolt is displaced radially, displacing a movable plate in the axial direction. This axial displacement separates the movable plate from the friction plate, and the brake is released even in situations where the electromagnet cannot be excited. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-76890 A Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 describes a non-excitation actuation brake that can be easily released manually by operating a manual operation member from the radial direction of the rotating shaft to separate the movable plate from the friction plate. However, the brake release method described in Patent Document 1 has a problem in that the movable plate may be damaged if the manual operation member is applied with excessive pressure to the movable plate due to insufficient skill of the operator.

[0005] The main cause is human error, such as tightening the manual operating member too much when manually releasing the brake. This human error is caused by the difficulty in recognizing by touch that the manual operating member has come into contact with the movable plate or that the contact position with the movable plate has changed from the conical portion 612 to the same diameter portion.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a non-excitation actuation brake that can prevent overpressure on the movable plate and avoid damage to the movable plate. [Means for solving the problem]

[0007] An example of a means for solving the above problem is as follows.

[0008] An electric motor with a non-excitation brake comprising: a friction plate that is engaged with a rotating shaft to rotate and move axially; a movable plate that is arranged to be movable along the axial direction of the rotating shaft; a braking spring that presses the movable plate against the friction plate by spring force; an electromagnet that separates the movable plate from the friction plate by electromagnetic force; and a bolt that can be rotated and inserted toward the inner diameter side to apply pressure to move the movable plate away from a fixed plate, the tapered surface of the tip of the bolt being uneven. [Effects of the Invention]

[0009] According to the present invention, excessive screwing can be prevented when manually releasing a non-excitation operating brake, thereby avoiding damage to the movable plate. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a schematic cross-sectional view of a non-excitation operated brake-equipped electric motor. [Figure 2] FIG. 2 is an enlarged explanatory view of a brake portion of the non-excitation operating brake. [Figure 3A] FIG. 10 is an explanatory diagram of the non-excitation operating brake before the brake is manually released. [Figure 3B] FIG. 10 is an explanatory diagram of the non-excitation operating brake when the brake is manually released. [Figure 4A] FIG. 2 is an enlarged explanatory view of a manual loosening bolt 70. [Figure 4B] 4B is an enlarged explanatory view of the manual release bolt 70 in a direction perpendicular to FIG. 4A. FIG. [Figure 5A] FIG. 2 is a side view of a non-excitation operated brake-equipped electric motor. [Figure 5B] FIG. 2 is a front view of a non-excitation operated brake-equipped electric motor. [Figure 6A] 4B is an example of a schematic cross-sectional structure of the portion along line AA in FIG. 4A. [Figure 6B] 4B is an example of a schematic cross-sectional structure of the portion along line AA in FIG. 4A. [Figure 6C] 4B is an example of a schematic cross-sectional structure of the portion along line AA in FIG. 4A. [Figure 6D] 4B is an example of a schematic cross-sectional structure of the portion along line AA in FIG. 4A. DETAILED DESCRIPTION OF THE INVENTION [Example]

[0011] An embodiment of the present invention will be described below. First, the basic structure of a non-excitation operated brake-equipped electric motor will be described with reference to Fig. 1. Fig. 1 is a schematic cross-sectional view of a non-excitation operated brake-equipped electric motor.

[0012] As shown in FIG. 1, an electric motor with a non-excitation operating brake (hereinafter referred to as the electric motor) 100 has a rotating shaft 3 rotatably supported at both ends by end brackets 4 via bearings 2, a rotor 22 fixed to the rotating shaft 3, and a stator 21 wound around the outside of the rotor 22, all of which are housed in a housing made up of an annular housing 20 and end brackets 4.

[0013] A non-excitation operating brake 500 and a self-cooling fan 23 are attached to one side of the rotating shaft 3 extending from the end bracket 4 to the outside of the electric motor 100, and a load is attached to the other side.

[0014] The non-excitation operating brake 500 and the self-cooling fan 23 are protected by a fan cover 24 .

[0015] Next, the structure of the non-excitation operating brake 500 of this embodiment will be described.

[0016] 2 is an enlarged explanatory view of the brake portion of the non-excitation operating brake 500. The non-excitation operating brake 500 comprises an electromagnet 51, a fixed plate 52, a movable plate 53, a friction plate 54, and a hub 55.

[0017] The electromagnet 51 is fixed to the end bracket 4 and is equipped with a braking spring 60. A hub 55 is fitted onto the rotary shaft 3 extending from the center of the motor so as to rotate in conjunction with the rotation of the rotary shaft 3. The disc-shaped friction plate 54 is a disc provided on the periphery of the hub 55 with friction portions formed on both sides, and is engaged with the rotary shaft 3 so as to be rotatable and movable in the axial direction.

[0018] The fixed plate 52 and the movable plate 53 are ring plates arranged concentrically with the rotating shaft 3 so as to sandwich the friction plate 54. The fixed plate 52 is fastened and fixed to the electromagnet 51 in the axial direction of the rotating shaft 3 by three fixed plate holding members 61 distributed around the circumference.

[0019] Movable plate 53 is attached to rotating shaft 3 so as to be movable in the axial direction by three circumferentially distributed through-holes and fixed plate holding member 61. When electromagnet 51 is not excited, it is pressed against friction plate 54 by the spring force of braking spring 60, and when electromagnet 51 is excited, it is separated from friction plate 54 and attracted to electromagnet 51 by an electromagnetic force that exceeds the spring force.

[0020] The electromagnet 51 , fixed plate 52 , movable plate 53 , friction plate 54 , and hub 55 are protected by a brake cover 56 that covers the outer periphery of these components and is fixed to the end bracket 4 .

[0021] Next, the brake release by manual operation of the non-excitation operating brake will be described.

[0022] Fig. 3A is an explanatory diagram of the non-excitation operating brake before the brake is manually released, and Fig. 3B is an explanatory diagram of the non-excitation operating brake when the brake is manually released.

[0023] The components for manually releasing the brake from the radial direction of the rotating shaft 3 are the brake cover 56, the manual release bolt 70 attached to the side of the brake cover 56, the fixed plate 52, the movable plate 53, and the friction plate 54.

[0024] The manual release bolt 70 is a rod-shaped body that passes through a female-threaded through-hole 561 provided in the brake cover 56 and is displaced in the radial direction of the rotating shaft 3, and is composed of a long, slender, cylindrical main body 71 with a male thread formed therein, a cone body 72 with a cone formed at one end of the main body 71, an operating part 73 attached to the other side of the cone body 72, a positioning pipe 74 when the motor is running, and a washer 75 that prevents the positioning pipe 74 from falling out of the main body 71 when the manual release bolt is removed. Note that in Figure 3A, the main body 71 is inserted inside the positioning pipe 74, so 74 can be seen from the outside.

[0025] Next, manual release of the non-excitation operating brake will be described with reference to FIG. 3B.

[0026] When the motor is not running, the positioning pipe 74 and washer 75 are removed together with the manual release bolt 70. At this time, the washer 75 is integrated with the manual release bolt by the washer 75 itself or by a rubber-like elastic member provided inside the washer 75, so the positioning pipe 74 and washer 75 are removed together when the manual release bolt 70 is removed. Thereafter, the positioning pipe 74 and washer 75 are removed, and the manual release bolt 70 is reinstalled.

[0027] The operation of the manual release bolt 70 will now be described.

[0028] When an operator rotates the manual operation unit 73, the main body 71 is displaced in the axial direction of the main body 71, i.e., along the radial direction of the rotation shaft 3, by the screw feed of the through-hole 561. As a result, the tip cone portion 72 of the manual loosening bolt 70 eventually comes into contact with the movable plate 53, and by pressing the tapered surface of the tip cone portion 72 against it, the movable plate 53 is displaced toward the electromagnet 51. As a result, the movable plate 53 separates from the friction plate 54, and the brake is released.

[0029] Fig. 4A is an enlarged explanatory view of the manual release bolt 70. Fig. 4B is an enlarged explanatory view of the manual release bolt 70 in a direction perpendicular to Fig. 4A.

[0030] As shown in Figure 4A, the manual loosening bolt 70 has grooves 76 carved into the conical portion 72 at the tip at 180-degree intervals. Because of this groove, the grooves 76 bite into the corners of the movable plate 53 every half turn of the manual operating part, so that vibrations caused by the unevenness of the grooves are transmitted to the operator.

[0031] This allows the operator to know whether the movable plate 53 and the conical body portion 72 are in contact with each other and how much or how many times they have been rotated. Therefore, by knowing the number of vibrations, the operator can know the amount of depression.

[0032] The unevenness can be discrete, for example, at intervals of 120 degrees in the circumferential direction, and the height of the unevenness can be set according to the taper of the bolt and the required moving distance of the movable plate.

[0033] Fig. 6A is a schematic cross-sectional view of the AA line portion of Fig. 4A. It shows that grooves are provided at intervals of 180 degrees. Similarly, Fig. 6B shows that grooves are provided at intervals of 90 degrees. Note that this angle may be symmetrical, for example, 120 degrees.

[0034] Fig. 6C shows an example in which, instead of grooves, a portion of the circumference is cut off every 180 degrees to form edges. Fig. 6D shows an example in which, instead of grooves, protrusions are provided every 180 degrees. Thus, the term "convexo-concave" as used in this application includes within its scope various modified examples, as long as the structure has an inflection point or change point in the direction of rotation.

[0035] Furthermore, the present application has a significant feature in the structure itself of the manual release bolt used in an electric motor with a non-excitation operated brake, and therefore the manual release bolt itself used in an electric motor with a non-excitation operated brake having such features is also within the scope of disclosure of the present invention and within the scope of the claimed rights.

[0036] Next, we will explain the installation position of the manual release bolt 70. If only one manual release bolt 70 is installed, at least its function can be realized.

[0037] However, a plurality of these may be provided.

[0038] FIG. 5A is a side view of an electric motor with a non-excitation brake. FIG. 5B is a front view of an electric motor with a non-excitation brake. FIG. 5B shows a diagram in which there are multiple manual operation units 73. In this way, multiple manual release bolts 70 can be installed. Preferably, the manual release bolts 70 are attached every 180 degrees or every 120 degrees with respect to the rotating shaft 3.

[0039] In this way, by arranging the manual operation parts 73, i.e., the manual loosening bolts 70, point-symmetrically and at multiple locations with respect to the center of rotation of the rotating shaft 3, it is possible to achieve the effect of separating the friction plate 54 uniformly within the surface.

[0040] The technical concepts explained above in the present invention include modifications and combinations within the scope of the present invention as long as the concepts are used.

[0041] The technical concept detailed above can also be expressed as follows.

[0042] <Part 1> a friction plate that is engaged with the rotary shaft to rotate and move in the axial direction; a movable plate disposed so as to be movable along the axial direction of the rotation shaft; a braking spring that presses the movable plate against the friction plate by a spring biasing force; an electromagnet that separates the movable plate from the friction plate by electromagnetic force; a bolt that can be rotated and inserted toward an inner diameter side to apply pressure to move the movable plate away from the fixed plate; An electric motor with a non-excitation brake, in which the tapered surface at the tip of the bolt is uneven.

[0043] <Part 2> a housing that rotatably accommodates the rotary shaft; a friction plate that is engaged with the rotary shaft, rotates, and moves in the axial direction; a movable plate disposed so as to be movable along the axial direction of the rotation shaft; a braking spring that presses the movable plate against the friction plate by a spring biasing force; an electromagnet that separates the movable plate from the friction plate by electromagnetic force; a brake cover that covers and protects the friction plate, the movable plate, and the fixed plate, The brake cover or the housing is provided with a bolt that is rotated and inserted toward the inner diameter side, The bolt has a tapered tip, and when the bolt is rotated and inserted, the tapered surface presses the movable plate so as to move it away from the fixed plate, An electric motor with a non-excitation brake, in which the tapered surface at the tip of the bolt is uneven.

[0044] <Part 3> In the electric motor with a non-excitation operating brake described in <No. 2>, The unevenness is a groove, protrusion, or flat portion provided on a part of the tapered surface across the extension direction of the bolt.

[0045] <Part 4> In the electric motor with a non-excitation operating brake described in <No. 3>, The bolt is for manually releasing the non-excitation brake when the brake is not excited.

[0046] <Part 5> In the electric motor with a non-excitation operating brake described in <Item 4>, a plurality of the bolts are provided on the rotating shaft of the electric motor with a non-excitation operating brake.

[0047] <Part 6> In the electric motor with a non-excitation operating brake described in <Item 5>, the bolts are provided symmetrically with respect to the rotation axis of the electric motor with a non-excitation operating brake.

[0048] <Part 7> In the electric motor with a non-excitation operated brake described in <No. 5>, the bolts are arranged so that they form an equal angle with respect to the rotating shaft of the electric motor with a non-excitation operated brake.

[0049] <Part 8> In the electric motor with a non-excitation operating brake described in <No. 1>, the unevenness allows an operator to grasp the degree of rotation and insertion of the bolt.

[0050] <No. 9> In the electric motor with a non-excitation operating brake described in <No. 2>, the unevenness allows an operator to grasp the degree of rotational insertion of the bolt. [Explanation of symbols]

[0051] 2: Bearing 3: Rotation axis 4: End bracket 20: Housing 21: Stator 22: Rotor 23: Self-cooling fan 24: Fan cover 51: Electromagnet 52: Fixed plate 53: Movable plate 54:Friction plate 55: Hub 56: Brake cover 60: Brake spring 61: Fixed plate holding member 70: Manual loosening bolt 71: Manual loosening bolt body 72: Manual loosening bolt cone part 73:Human operation section 74: Positioning pipe 75: Washer 76: Groove 100: Electric motor with non-excitation operating brake, 500: Non-excitation brake-equipped motor 561: Brake cover female thread through hole

Claims

1. a friction plate that is engaged with the rotary shaft to rotate and move in the axial direction; a movable plate disposed so as to be movable along the axial direction of the rotation shaft; a braking spring that presses the movable plate against the friction plate by a spring biasing force; an electromagnet that separates the movable plate from the friction plate by electromagnetic force; a bolt that can be rotated and inserted toward an inner diameter side to apply pressure to move the movable plate away from the fixed plate; The tip of the bolt has a tapered surface, and the tapered surface has an uneven surface.

2. a housing that rotatably accommodates the rotary shaft; a friction plate that is engaged with the rotary shaft, rotates, and moves in the axial direction; a movable plate disposed so as to be movable along the axial direction of the rotation shaft; a braking spring that presses the movable plate against the friction plate by a spring biasing force; an electromagnet that separates the movable plate from the friction plate by electromagnetic force; a brake cover that covers and protects the friction plate, the movable plate, and the fixed plate, The brake cover or the housing is provided with a bolt that is rotated and inserted toward the inner diameter side, The bolt has a tapered tip, and when the bolt is rotated and inserted, the tapered surface presses the movable plate so as to move it away from the fixed plate, The tapered surface of the motor has irregularities.

3. 3. The electric motor with a non-excitation operating brake according to claim 2, The unevenness is a groove, protrusion, or flat portion provided on a part of the tapered surface across the extension direction of the bolt.

4. 4. The electric motor with a non-excitation operating brake according to claim 3, The bolt is for manually releasing the non-excitation brake when the brake is not excited.

5. 5. The electric motor with a non-excitation operating brake according to claim 4, wherein a plurality of the bolts are provided on the rotating shaft of the electric motor with a non-excitation operating brake.

6. 6. A non-excitation operated brake-equipped electric motor according to claim 5, wherein the bolts are provided symmetrically with respect to the rotation axis of the non-excitation operated brake-equipped electric motor.

7. 6. A non-excitation operated brake-equipped electric motor according to claim 5, wherein the bolts are provided so as to form an equal angle with respect to a rotation shaft of the non-excitation operated brake-equipped electric motor.

8. 2. The electric motor with a non-excitation operating brake according to claim 1, wherein the unevenness allows an operator to grasp the degree of rotational insertion of the bolt.

9. 3. The electric motor with a non-excitation operating brake according to claim 2, wherein the unevenness allows an operator to grasp the degree of rotational insertion of the bolt.

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