JP2004350467A - Electric motor with brake and brake gap inspecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an electric motor with brake that is not caused to emit abnormal sound by the vibrations of a manually releasing brake device during a normal operation. <P>SOLUTION: This electric motor with brake is provided with a brake device 2b, consisting of a fixed iron core 7 comprising an electromagnetic coil 6 and a brake spring 5; a movable iron core 3 that is operated by the electromagnetic coil and the brake spring; a fixed portion 4b that faces the movable iron core; brake discs 2, that sandwiched and pressed by the fixed portion and the movable iron core, brakes a motor shaft 1; and a cap-like brake cover 15 that covers all these components. In this motor, the manual brake releasing means 9e is provided, that engages with the brake device 2b freely detachably and moves the movable iron core to the fixed iron core side, resisting to the spring force of the brake spring. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor with a brake provided with a safety brake that generates a braking force when power is not supplied, and facilitates manual release of a brake and inspection and adjustment of a gap.
[0002]
[Prior art]
Manual release of the safety brake that generates a braking force when de-energized is performed, for example, when moving the traveling vehicle during installation of an electric motor driven traveling vehicle in an automatic warehouse performed when the electric equipment is incomplete, or when a power failure occurs. This is necessary when moving the brake when electricity cannot be supplied to the brake, such as during an emergency stop.
[0003]
As a conventional manual release device for a brake, a movable iron core which is pressed by a brake spring provided on a fixed iron core and presses a brake disc to perform braking is moved to a fixed iron side by a pin type cam which is rotated from the outside of the electric motor. One that pushes back to release the brake (for example, see Patent Document 1), and one that releases the brake by pushing the movable core back to the fixed iron side with a lever-type brake manual release plate that swings from the outside of the electric motor (for example, see Patent Document 1) 2).
[0004]
[Patent Document 1]
JP-A-5-292701 (Abstract, FIGS. 1-4)
[Patent Document 2]
JP-A-11-127554 (Abstract, FIGS. 1-2)
[0005]
[Problems to be solved by the invention]
In the above-mentioned conventional motor with a brake, none of the motors is completely fixed to the motor and has a pin-type cam or a lever-type manual brake release plate which cannot be removed. The vibration of the electric motor was transmitted to the pin type cam and the lever type manual release plate of the brake, causing abnormal noise.
[0006]
Further, in any case, the brake portion is covered with a fan cover, a tubular body, or a brake cover, and when inspecting the gap of the brake, it is necessary to remove the fan cover, the cooling fan, and the brake cover. The gap inspection is performed to detect the wear state of the brake sliding surface, and the regular gap inspection performed by removing the fan cover, the cooling fan, and the brake cover has been troublesome.
[0007]
In particular, in the case of a motor with a built-in rotation detector, when adjusting the gap of the brake, the rotation detector must be removed with the removal of the brake cover. Removing and reassembling the rotation detector, which is a precision part, at the work site involves a problem in that assembly accuracy is difficult.
[0008]
In addition, when performing maintenance such as gap inspection and adjustment, it is necessary to move the cap-shaped fan cover to the rear and remove it.Therefore, it is necessary to provide a space where the fan cover can be removed behind the motor, and install the motor. There was a problem that the mechanical device could not be made compact.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in view of the above, and a first object of the present invention is to provide an electric motor with a brake in which a manual brake release device does not vibrate and generate abnormal noise. A second object is to provide a brake-equipped motor that can check a brake gap without removing a fan cover or the like. A third object is to provide a brake-equipped motor in which the gap can be easily adjusted by allowing the fan cover to be easily removed. A fourth object is to provide a brake-equipped motor that does not reduce the cooling capacity of the cooling fan. A fifth object is to provide a brake-equipped electric motor which can maintain a closed structure of a brake device and can manually release a brake without removing a rotation detector.
[0010]
[Means for Solving the Problems]
An electric motor with a brake according to the present invention includes a fixed iron core having an electromagnetic coil and a brake spring, a movable iron core operated by the electromagnetic coil and the brake spring, a fixed part facing the movable iron core, A brake-equipped electric motor including a brake device including a brake disk that is sandwiched between the movable cores and pressed to brake the motor shaft, and a cap-shaped brake cover that covers the brake disk, detachably engages with the brake device, A brake manual release means for moving the movable iron core toward the fixed iron core against the spring force of the brake spring is provided.
[0011]
According to the present invention, since the brake device is provided with a brake manual release unit that detachably engages with the brake device and moves the movable core toward the fixed core against the spring force of the brake spring, during normal operation of the electric motor, Since the brake manual release means can be removed, the vibration of the electric motor is not transmitted and does not cause the generation of abnormal noise.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of a motor with a brake according to the present invention will be described in detail with reference to the accompanying drawings.
[0013]
Embodiment 1 FIG.
Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view showing an electric motor with a brake according to a first embodiment of the present invention, FIG. 2 (a) is a sectional view taken along line AA of FIG. 1, FIG. 2 (b) is a sectional view taken along line BB of FIG. FIG. 3 is an explanatory diagram of a method of checking a brake gap.
[0014]
As shown in the figure, a non-load-side bracket 4 is attached to the rear end of the cylindrical motor frame 4a, and the motor shaft 1 is supported on the non-load-side bracket 4 via a bearing. A hub 2a is mounted and fixed to the motor shaft 1 behind the non-load side bracket 4, and two brake disks 2, 2 which rotate together with the hub 2a are mounted on the hub 2a so as to be slidable in the axial direction. I have. A fixed iron core 7 having an electromagnetic coil 6 and a brake spring 5 is installed behind the hub 2a and supported by the non-load side bracket 4, and a movable iron core 3 slidable only in the axial direction is provided in front of the fixed iron core 7. Provided.
[0015]
A fixed portion 4b opposed to the movable iron core 3 is fixed to the back surface of the non-load side bracket 4, and the brake disks 2, 2 alternately arranged and stop disks 26, 26 for braking the brake disks are sandwiched between the fixed portions 4b. I have. An adjustment plate 17 for adjusting a brake gap is attached to the back surface of the fixed portion 4b. The movable core 3 is separated from the fixed core 7 by the brake spring 5 and pressed against the fixed portion 4 b with the brake disks 2, 2 and the stop disks 26, 26 interposed therebetween, thereby braking the motor shaft 1 and exciting the electromagnetic coil 6. As a result, the brake is released by being sucked by the fixed iron core 7. That is, the movable iron core 3 is operated by the electromagnetic coil 6 and the brake spring.
[0016]
The above-mentioned brake device is covered with a cap-shaped brake cover 15 fixed to the non-load-side bracket 4. The fixed iron core 7, the movable iron core 3, the hub 2a, the brake disks 2, 2, the stop disks 26, 26, the fixed portion 4b, the adjustment plate 17, and the brake cover 15 constitute a brake device 2b. A cylindrical detector cover 14a that covers a rotary encoder 14 as a rotation detector that detects rotation of the electric motor is attached to the back of the brake cover 15, and a cooling fan 12 is attached to the rear end of the detector cover 14a. A cap-shaped fan cover 13 is attached to the non-load-side bracket 4 so as to cover the cooling fan 12, the rotation detector 14, and the brake device 2b.
[0017]
Circular holes 9a are provided in the radial direction at two positions on the outer periphery of the fixed iron core 7 which are symmetrical with respect to the motor axis (see FIG. 2B). An elongated inspection hole 9b that can be seen is provided, and an insertion hole 9c through which a pin-shaped cam 9 described later can be inserted is also provided in the fan cover 13. At a position corresponding to the circular hole 9a of the movable iron core 3, an L-shaped contact 16 having a cam hole 16a serving as a contact portion with the cam surface 9d of the pin-shaped cam 9 is attached. It engages with the movable iron core 3 via the contact 16. The tip of the pin-shaped cam 9 has a circular cross section, is rotatably and detachably inserted into the circular hole 9a through the insertion hole 9c, the inspection hole 9b, and the cam hole 16a, and engages with the fixed iron core 7. The head of the pin-shaped cam 9 is out of the fan cover 13 and is rotated by a handle 11 as a rotating means attached to the head.
[0018]
As shown in FIG. 2B, the shape of the cam surface 9d is D-shaped, and the cam hole 16a is rectangular. The pin type cam 9 and the handle 11 constitute a manual brake release means 9e. In this embodiment, two manual release means 9e are provided on the outer periphery of the fixed iron core 7. However, one or three or more manual release means may be provided. . Further, the form of the mounting portion between the pin-shaped cam 9 and the handle 11 may be a socket wrench type or a hexagonal hole type. Further, the L-shaped contact 16 need not be L-shaped as long as it can be firmly fixed to the outer peripheral portion of the movable core 3.
[0019]
In order to operate the brake manual release means 9e, two pin-shaped cams 9 are inserted through the insertion holes 9c of the fan cover 13 and each of them is rotated by about 90 °. The movable core 16 is moved to draw the movable core 3 toward the fixed core 7. As a result, gaps are formed between the movable iron core 3, the brake disks 2, 2, and the stop disks 26, 26, and the brake is released, so that the motor shaft 1 can rotate. From this state, if the pin cam 9 is rotated by 90 ° in the reverse direction and pulled out, the braking state can be returned.
[0020]
Next, a method of checking a brake gap according to the present invention will be described with reference to FIG.
FIG. 3 (a) is a view showing a brake braking state when the power supply to the motor is turned off. The rotation angle of the pin-shaped cam 9 is 0 °, and the distance between the D-shaped linear portion of the cam surface 9d and the cam hole 16a at this time. Is provided with an initial gap 9f. FIG. 5B shows that the pin-shaped cam 9 is rotated in the counterclockwise direction so that the edge of the D-shaped cam surface 9d contacts the cam hole 16a to move the contact 16 and the gap between the movable iron core 3 and the brake disc 2 begins. FIG. 9 is a view showing a state in which the brake is started to be manually released and the rotation angle when the pin type cam 9 rotates around the cam hole 16a and the edge of the cam surface 9d starts to contact the cam hole 16a. The scale is 9g so that it can be seen.
[0021]
When the motor with brake operates for a certain period, the lining of the brake disk 2 becomes worn and thin. Then, the moving amount, that is, the gap 22 from the rotating state of the motor, in which the movable iron core 3 is attracted to the fixed iron core 7, to the movement of the brake spring 5 to brake the brake disk 2, that is, the gap 22 becomes large, and a braking delay occurs. Therefore, a gap adjustment is performed to adjust the thickness of the adjusting plate 17 in accordance with the wear of the brake disk and maintain the gap 22 properly.
[0022]
When the gap 22 becomes larger, the above-mentioned initial gap 9f becomes smaller, so that the edge of the cam surface 9d comes into contact with the cam hole 16a and starts to move the contact 16 with only a slight rotation of the pin-shaped cam 9. Accordingly, the brake gap 22 can be inspected by rotating the pin-shaped cam 9 counterclockwise and observing the rotation angle at which the edge of the cam surface 9d starts to contact the cam hole 16a. Further, since the brake cover 15 is provided with the elongated inspection hole 9b, the gap inspection and the gap adjustment can be performed without removing the brake cover 15.
[0023]
Embodiment 2 FIG.
Embodiment 2 of the present invention will be described with reference to FIGS. 4 (a), (b) and (c). FIG. 4A is a longitudinal sectional view showing an electric motor with a brake according to a second embodiment of the present invention, FIG. 4B is a sectional view taken along line FF of FIG. 4A, and FIG. It is GG sectional drawing of a). In these figures, the same or equivalent components as those shown in FIGS.
[0024]
As shown in the figure, a fixed iron core 7 having an electromagnetic coil 6 and a brake spring 5 is installed on the back surface of the non-load side bracket 4, and a movable iron core 3 slidable only in the axial direction is provided behind the fixed iron core 7. Provided. A fixed portion 4b is supported and fixed to the non-load-side bracket 4 so as to face the movable core 3, and a brake disk 2 which is interposed therebetween and rotates together with the hub 2a is slidably mounted in the axial direction. . Although not shown, an adjustment plate 17 for adjusting a brake gap is attached to a front surface of the fixed portion 4b. That is, in the brake device 2b of the second embodiment, the axial arrangement of the fixed iron cores 7 to the fixed portions 4b is opposite to that of the first embodiment.
[0025]
A support plate 21 with which a pin-shaped cam 29 is rotatably and detachably engaged is attached to an outer peripheral portion of the fixed iron core 7, and the pin-shaped cam 29 is attached to a tip end of an engagement portion with the support plate 21. And a cam surface 29d which engages with the movable core 3 and moves the movable core 3 toward the fixed core 7 by rotation to release the brake. The head of the pin-shaped cam 29 is out of the fan cover 13 and is rotated by the handle 11 as a rotating means attached to the head. As shown in FIG. 4B, the shape of the cam surface 29d is D-shaped. In the second embodiment, the pin cam 29 is engaged with the fixed iron core 7 via the support plate 21.
[0026]
In order to operate the pin-shaped cam 29, two pin-shaped cams 29 are inserted through the insertion holes 9c of the fan cover 13 and each of them is rotated by about 90 °. To the fixed iron core 7 side. As a result, gaps are respectively formed between the movable iron core 3, the brake disc 2 and the fixed portion 4b, and the brake is released to allow the motor shaft 1 to rotate. From this state, if the pin-shaped cam 29 is rotated 90 ° in the reverse direction and pulled out, the braking state can be returned.
[0027]
Next, a method of checking the brake gap in the second embodiment will be described. When the rotation angle of the pin-shaped cam 29 is 0 ° in the brake braking state with the power supply to the motor turned off, an initial gap is provided between the movable core 3 and the D-shaped linear portion of the cam surface 29d. When the pin-shaped cam 29 is rotated clockwise, the edge of the cam surface 29d comes into contact with the movable core 3 at a certain rotation angle and starts moving the movable core 3 to form a gap 23 between the movable core 3 and the brake disc 2. , The brakes begin to be manually released. The rotation angle of the cam 29 when the edge of the cam surface 29d comes into contact with the movable iron core 3 can be known by increasing the rotation resistance of the pin-shaped cam 29.
[0028]
When the brake disc 2 is worn and thinned, the above-mentioned initial gap becomes small, and the edge of the cam surface 29d comes into contact with the movable core 3 and starts to move the movable core 3 with only a slight rotation of the pin-shaped cam 29. . Therefore, the brake gap can be checked by rotating the pin-shaped cam 29 clockwise and observing the rotation angle at which the edge of the cam surface 29d starts to contact the movable iron core 3 by the rotation angle of the handle 11. Further, since the brake cover 15 is provided with the elongated inspection hole 9b, the gap can be inspected without removing the brake cover 15, and the gap can be adjusted by adjusting the thickness of the adjusting plate 17. Can be.
[0029]
Embodiment 3 FIG.
Embodiment 3 of the present invention will be described with reference to FIGS. 5 (a), 5 (b), 5 (c) and FIG. 5 (a) is a longitudinal sectional view showing a motor with a brake according to Embodiment 3 of the present invention, FIG. 5 (b) is a sectional view taken along line HH of FIG. 5 (a), and FIG. 5 (c) is FIG. FIG. 6A is a sectional view taken along the line JJ of FIG. In these drawings, the same or equivalent components as those shown in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof is omitted.
[0030]
In the figure, a fan cover 33 is provided with an elongated rectangular notch 33a over the entire length of the brake device 2b, and the detector cover 14a is provided with a bracket 14b, and a connector 14c for the rotation detector 14 and a cooling fan 12 A long and thin mounting plate 18 for mounting the terminal box 12a is mounted on the bracket 14b, and the mounting plate 18 fills almost the entire area of the notch 33a. The fan cover 33 has a vertically divided structure, and is fastened and integrated with screws 20 and attached to the non-load side bracket 4 with screws 19.
[0031]
In the motor with a brake configured as described above, the entire area of the notch 33a of the fan cover 33 for exposing and installing the connector 14c and the terminal box 12a is filled with the mounting plate 18, so that the notch is used. The cooling air from the cooling fan 12 is prevented from leaking from the cooling fan 33a.
[0032]
At the time of maintenance such as checking the gap of the brake device 2b, the fan cover 33 needs to be removed. However, when the connector 14c and the terminal box 12a are not the cutout portion 33a but "holes" for exposing the terminal box 12a to the outside, the connector 14c Unless the box 12a and the mounting plate 18 are removed, the fan cover 33 cannot be removed rearward, and it takes time to remove the fan cover 33 and reassemble after checking the gap. In the motor with a brake according to the third embodiment, by providing the notch 33a in the fan cover 33, it is possible to inspect the gap of the brake device 2b only by removing the screw 19.
[0033]
Also, as shown in FIG. 6, when there is a wall or other device immediately behind the fan cover 33 (for example, about 50 mm), the fan cover 33 cannot be removed. After that, maintenance such as gap adjustment must be performed, which is a rather large-scale operation. In the motor with a brake according to the third embodiment, the fan cover 33 is divided into two parts in the vertical and horizontal directions, and the screws 19 and 20 are removed to divide the fan cover 33 in the vertical and horizontal directions. To remove it and adjust the brake gap.
[0034]
Embodiment 4 FIG.
Fourth Embodiment A fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a longitudinal sectional view showing an electric motor with a brake according to Embodiment 4 of the present invention. In the drawings, the same or equivalent components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof is omitted.
[0035]
In the figure, a brake cover 45 has a cap-type closed structure without an inspection hole, and an elongated mounting plate 18 for mounting the connector 14c and the terminal box 12a is mounted on the brake cover 45. The brake cover 45, the fixed core 7, and the movable core 3 are provided with through holes 45a concentrically in the direction of the motor shaft 1, the holes 45b of the movable core 3 are screw holes, and the holes of the brake cover 45 are slightly larger screw holes 45c. It has become. To release the brake, the fan cover 33 is removed, the release bolt 24 as a manual brake release means is screwed into the screw hole 45b of the movable core 3 through the through hole 45a and engaged, and the movable core 3 is moved toward the fixed core 7 side. Pull to move and open. During normal operation of the electric motor, the release bolt 24 is removed, the sealing bolt 25 is screwed into the screw hole 45c of the brake cover 45, and the brake device 2b is sealed.
[0036]
Embodiment 5 FIG.
Embodiment 5 of the present invention will be described with reference to FIG. FIG. 8 is a side view showing an electric motor with a brake according to Embodiment 5 of the present invention. In the drawings, the same or equivalent components as those shown in FIGS. 1 to 7 are denoted by the same reference numerals, and description thereof is omitted.
[0037]
The motor with a brake according to the fifth embodiment is a two-axis motor in which the brake device 2b is provided on the non-load side, and the motor shaft 1 projects on the load side and the non-load side. The rotation detector 14 is connected to the motor shaft 1 via a coupling 30 on the non-load side. Thus, the brake cover 45 and the brake device 2b therein are the same as those in the fourth embodiment. In the motor with a brake, manual release of the brake device 2b can be performed without removing the detector 14, the coupling 30, and the brake cover 45. In this embodiment, the rotation detector 14 is connected to the rotation detector 14 via the coupling 30 on the non-load side, but a pump or the like may be connected instead of the rotation detector 14.
[0038]
【The invention's effect】
According to the present invention, since the brake device is provided with a brake manual release unit that detachably engages with the brake device and moves the movable core toward the fixed core against the spring force of the brake spring, during normal operation of the electric motor, The brake manual release means can be removed, and the vibration of the electric motor is not transmitted to the brake manual release means, which does not cause abnormal noise.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an electric motor with a brake according to a first embodiment of the present invention.
2A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line BB in FIG.
FIG. 3 is an explanatory diagram of a method of checking a brake gap.
FIG. 4 is a longitudinal sectional view showing a motor with a brake according to a second embodiment of the present invention.
FIG. 5 is a longitudinal sectional view showing an electric motor with a brake according to a third embodiment of the present invention.
FIG. 6 is a diagram showing an installation example of a motor with a brake.
FIG. 7 is a longitudinal sectional view showing an electric motor with a brake according to a fourth embodiment of the present invention.
FIG. 8 is a side view showing an electric motor with a brake according to a fifth embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 1 motor shaft, 2 brake disc, 2b brake device, 3 movable iron core, 4 non-load side bracket, 4b fixed part, 5 brake spring, 6 electromagnetic coil, 7 fixed iron core, 9, 29 pin cam, 9e, 24 manual brake Release means, 11 handle, 12 cooling fan, 13, 33 fan cover, 14 rotation detector, 15, 45 brake cover, 16 contacts, 17 adjusting plate, 18 mounting plate, 19 screw, 20 screw, 21 support plate, 22 Gap, 24 release bolt, 25 sealing bolt, 26 stop disc.

Claims (6)

A fixed iron core having an electromagnetic coil and a brake spring, a movable iron core operated by the electromagnetic coil and the brake spring, a fixed part facing the movable iron core, and a motor pressed between the fixed part and the movable iron core. In a brake-equipped electric motor including a brake device including a brake disc that brakes a shaft and a cap-shaped brake cover that covers these,
An electric motor with a brake, comprising: a brake manual release means which is detachably engaged with the brake device and moves the movable iron core toward the fixed iron core against the spring force of the brake spring. A fixed iron core having an electromagnetic coil and a brake spring, a movable iron core operated by the electromagnetic coil and the brake spring, a fixed part facing the movable iron core, and a motor pressed between the fixed part and the movable iron core. A brake-equipped motor including a brake disk that brakes the shaft and a cap-shaped brake cover that covers them, and further including a cap-shaped fan cover that covers the brake device and the cooling fan,
An electric motor with a brake, comprising: a brake manual release means which is detachably engaged with the brake device and moves the movable iron core toward the fixed iron core against the spring force of the brake spring. A fixed iron core having an electromagnetic coil and a brake spring, a movable iron core operated by the electromagnetic coil and the brake spring, a fixed part facing the movable iron core, and a motor pressed between the fixed part and the movable iron core. A brake device comprising a brake disk for braking the shaft, an adjusting plate provided on the fixed portion for adjusting a brake gap, and a cap-shaped brake cover for covering the brake device, and a cap for covering the brake device and the cooling fan In a motor with a brake equipped with a fan-shaped fan cover,
The head is rotatably and detachably engaged with the fixed iron core, and is engaged with the movable iron core at a cam surface, and the fan head is passed through an inspection hole formed in the brake cover and an insertion hole provided in the fan cover. An electric motor with a brake, comprising a detachable pin-shaped cam which is taken out of a cover and rotated by a rotating means. The said fan cover is provided with the notch part which exposes the terminal box for cooling fans, The said notch part is filled with the mounting plate which attaches this terminal box, The Claim 2 or 3 characterized by the above-mentioned. Motor with brake. The electric motor with a brake according to any one of claims 2 to 4, wherein the fan cover has a divided structure that can be divided in a radial direction. The brake according to any one of claims 3 to 5, wherein the brake gap is checked by checking a rotation angle at which the pin-shaped cam rotates and the cam surface starts moving the movable iron core. To check the brake gap of a motor with a motor.

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