JP2003264958A - Motor with electromagnetic brake for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor with electromagnetic brake for a vehicle wherein water proofing property and operability to assembly are improved while low-cost frame and motor case are used, and waterproofing is available when assembling an electromagnetic brake and an encoder. <P>SOLUTION: The motor with electromagnetic brake for vehicle comprises a driving motor 1 which drives a vehicle, and an electromagnetic brake 2 which is disposed on an anti-load side of a drive motor 1 and excites an electromagnetic coil 8 to release a spindle 7 of the drive motor 1 for free rolling. It comprises a motor case 4 which covers the drive motor 1 and also acts as a yoke constituting a magnetic circuit; an electromagnetic brake case 5 which is fixed to the motor case 4, covers the electromagnetic brake 2, and has an opening on the anti-load side of the drive motor 1; and an electromagnetic brake case cover 6 which covers the opening of the electromagnetic brake case 5. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor with an electromagnetic brake for vehicles such as silver cars.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional motor used for driving a silver car or the like. A motor used for driving a silver car or the like generally includes a driving motor 21, an electromagnetic brake 22, and an encoder 23. The drive motor 21 drives the silver car by rotating the rotating shaft. The electromagnetic brake 22 is arranged on the side opposite to the load of the drive motor 21, and energizes the electromagnetic coil to open the rotation shaft of the drive motor 21 so that the drive motor 21 is rotatable. Further, when the electromagnetic coil of the electromagnetic brake 22 is not excited, for example, when the silver car is stopped, the brake is operated by the spring force. The encoder 23 detects the rotation speed of the rotation shaft of the drive motor 21. By detecting the number of rotations, the moving speed of a silver car or the like can be limited.

Here, the electromagnetic brake 22 and the encoder 23 may be damaged when exposed to water. For example,
When the electromagnetic brake 22 is exposed to water, the rotation shaft of the drive motor 21 cannot be opened due to expansion of the brake shoe, etc.
The braking action is always active. Further, if the encoder 23 is exposed to water, it may not be possible to detect an accurate rotation speed. Therefore, in such a case, it is determined that a failure has occurred, and measures have been taken to prevent the silver car or the like from operating. Therefore, it is necessary to store the electromagnetic brake 22 and the encoder 23 in a closed chamber for waterproofing.

As an example, as shown in FIG. 2, the electromagnetic brake 22 and the encoder 23 arranged outside the motor case 24 are covered with a part of the motor case 24 and an electromagnetic brake cover 25. The motor case 24 surrounds the drive motor 21 and also serves as a yoke forming a magnetic circuit, and is formed by drawing. The electromagnetic brake cover 25 is formed by drawing or plastic molding.

FIG. 3 shows a motor used to drive another silver car or the like. The motor 21 for driving, the electromagnetic brake 22, and the encoder 23 are the same as those of the motor shown in FIG. Then, the drive motor 21
It is covered with a frame 26 made of aluminum die casting and a pipe-shaped motor case 27. The electromagnetic brake 22 and the encoder 23 are surrounded by a frame 26 and a frame cover 28 that covers an opening of the frame 26. The motor case 27 is formed by cutting a pipe. The frame cover 28 is formed by drawing or plastic molding.

[0006]

However, the motor shown in FIG. 2 has an electromagnetic brake cover 25 and a motor case 24.
There is a risk that water may enter through the gap of the overlapping portion a with and the electromagnetic brake 22 and the encoder 23 may be exposed to water. Furthermore, when trying to reduce this gap, the motor case 2
4 and the electromagnetic brake cover 25 need to be processed with high precision, which is expensive and makes it difficult to assemble the electromagnetic brake cover 25.

Further, the motor shown in FIG. 3 is relatively excellent in waterproof property and assembling property, but it is expensive because the frame 26 made of aluminum die casting is used. Further, since the motor case is formed by cutting the pipe, it becomes very expensive.

In the motor shown in FIGS. 2 and 3, the electromagnetic brake 22 and the encoder 23 must be assembled together with the drive motor 21, so that the assembly work takes a long time. It was Further, when the electromagnetic brake 22 and the encoder 23 are assembled to the drive motor 21, the present invention, which may be exposed to water before the electromagnetic brake cover 25 and the frame cover 28 are mounted, is made in view of such circumstances. A motor with an electromagnetic brake for vehicles that can improve waterproofness and assemblability while using an inexpensive frame and motor case, as well as waterproof when assembling the electromagnetic brake and encoder. The purpose is to do.

[0009]

Therefore, the present inventor has diligently studied to solve this problem, and as a result of repeated trial and error,
The present invention has been completed because of the idea of covering the electromagnetic brake and the like with an electromagnetic brake case and an electromagnetic brake cover that are parts separate from the motor case.

That is, a motor with an electromagnetic brake for a vehicle according to the present invention is characterized by having a drive motor, an electromagnetic brake, a motor case, an electromagnetic brake case, and an electromagnetic brake case cover.

Here, the drive motor is a motor for driving the vehicle. The electromagnetic brake is arranged on the side opposite to the load of the drive motor, and by exciting the electromagnetic coil, the rotary shaft of the drive motor is opened and made freely rotatable. It is for braking the rotating shaft. Here, the rotation shaft of the drive motor projects to both sides around the coil portion. The side of the rotary shaft to which the drive target is attached is called the load side of the drive motor, and the side where the drive target is not attached is called the anti-load side of the drive motor. The motor case is a case that surrounds the drive motor and also serves as a yoke that constitutes a magnetic circuit. The electromagnetic brake case is a bottomed cylindrical case that is fixed to the motor case at the bottom, surrounds the electromagnetic brake, and has an opening on the opposite side of the drive motor. The electromagnetic brake case cover is a cover that closes the opening of the electromagnetic brake case.

As a result, the electromagnetic brake case can be formed in a shape that does not use aluminum die casting, and further, excessive machining accuracy is not required, so that an inexpensive electromagnetic brake case can be used. In addition, since the motor case can be formed by drawing, it is not necessary to cut the pipe and can be manufactured at low cost. Further, the joint surface between the motor case and the electromagnetic brake case and the joint surface between the electromagnetic brake case and the electromagnetic brake case cover can be easily waterproofed by an O-ring or the like. Further, since the bottom portion of the bottomed cylindrical electromagnetic brake casing is fixed to the motor case, the gap existing in the conventional structure (the overlapping portion a between the electromagnetic brake cover and the motor casing in the motor shown in FIG. 2) is not present. Not having it improves waterproofness, and can be easily assembled. Further, since the mounting of the drive motor to the motor case and the mounting of the electromagnetic brake to the electromagnetic brake case can be performed separately, work efficiency is improved. Also, by adopting a bottomed cylindrical electromagnetic brake case, waterproofing is possible when the electromagnetic brake is assembled.

The motor with an electromagnetic brake of the present invention is characterized in that the electromagnetic brake case is made of a magnetic material, and the fixed iron core of the electromagnetic brake is in contact with the electromagnetic brake case. As a result, the electromagnetic brake case itself also constitutes a magnetic circuit. As a result, the leakage magnetic flux is reduced, the electromagnetic force is improved, and the electromagnetic brake can be improved in performance or downsized.

The motor with an electromagnetic brake of the present invention is characterized in that the electromagnetic brake case is made of a metal material and is formed by drawing. This allows
It can be manufactured at a much lower cost than the conventional frame made of aluminum die casting. Further, as described above, the electromagnetic brake case is not required to have excessive processing accuracy, so that the drawing processing accuracy can be lowered and the electromagnetic brake case can be manufactured at low cost.

The motor with an electromagnetic brake of the present invention is characterized in that the electromagnetic brake case is formed by plastic molding. As a result, it can be manufactured at a much lower cost than a conventional frame made of aluminum die casting. Further, as described above, the electromagnetic brake case does not require excessive processing accuracy, so that the molding accuracy can be lowered and the electromagnetic brake case can be manufactured at low cost.

A motor with an electromagnetic brake for a vehicle according to the present invention has an encoder, and the vehicle is a silver car. Here, the encoder is a detector that detects the number of rotations of the drive motor. The encoder is surrounded by the electromagnetic brake case and the electromagnetic brake case cover. Accordingly, a silver car, which particularly needs to be limited in maximum speed, can detect the rotation speed of the drive motor by mounting the encoder, and the movement speed is reliably limited based on the detection result. In addition, even in a silver car that travels outdoors, the electromagnetic brake and encoder can be reliably waterproofed and a failure can be prevented.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to embodiments.

FIG. 1 shows a motor with an electromagnetic brake for a silver car, which is an embodiment of the present invention. This includes a drive motor 1, an electromagnetic brake 2, an encoder 3, a motor case 4, an electromagnetic brake case 5, and an electromagnetic brake case cover 6.

The drive motor 1 drives a silver car or the like by rotating the rotary shaft 7. Here, the rotary shaft 7 of the drive motor 1 projects to both sides around the coil portion. The side of the rotary shaft 7 to which the drive target is attached is called the load side of the drive motor, and the side where the drive target is not attached is called the anti-load side of the drive motor.

The electromagnetic brake 2 comprises an electromagnetic coil 8, a fixed iron core 9, a movable plate 10, a brake shoe 11, a fixed plate 12 and a spring (not shown). Electromagnetic coil 8
The rotary shaft 7 of the drive motor 1 passes through the center of the fixed iron core 9 and the fixed iron core 9 and is fixed to the bottom of the electromagnetic brake case 5 described later. The movable plate 10 is movable in the axial direction and is operated by the attractive force of the electromagnetic coil 8 and the spring force of a spring (not shown). The fixed plate 11 is fixed to the fixed iron core 9. The brake shoe 12 is located between the movable plate 10 and the fixed plate 11, is movable in the axial direction, and further rotates together with the rotary shaft 7 of the drive motor 1. The spring (not shown) is located between the fixed iron core 9 and the movable plate 10 and acts in a direction to press the movable plate 10 toward the brake shoe 12 side.

When the electromagnetic coil 8 is excited, the electromagnetic brake 2 is rotatable by opening the rotary shaft 7 of the drive motor 1. When the electromagnetic coil 8 is not excited, the brake shoe 12 is sandwiched between the movable plate 10 and the fixed plate 11 to brake the rotary shaft 7.

Specifically, by exciting the electromagnetic coil 8, the fixed iron core 9 surrounding the electromagnetic coil 8 constitutes a magnetic circuit. Then, the movable plate 10, which has been pressed toward the brake shoe 12 by the spring (not shown), is attracted toward the fixed iron core 9 side. As a result, the brake shoe 12 separates from the movable plate 10 and the fixed plate 11 and rotates together with the rotating shaft 7. That is, the brake is released. On the other hand, when the electromagnetic coil 8 is not excited, the movable plate 10 is pressed toward the brake shoe 12 by the spring (not shown) between the fixed iron core 9 and the movable plate 10, and the brake shoe 12 is moved. And it is sandwiched between the fixing plates 11. As a result, the rotation of the rotary shaft 7 is braked by the frictional force of the brake shoe 12 and the brake is operated. For example, the brake is activated when the silver car is stopped.

The encoder 3 includes an encoder board 13 and
It consists of a photo interrupter 14 and an encoder rotor 15. The encoder board 13 is fixed to the fixed plate 11. The photo interrupter 14 is an encoder board 1.
3 is attached to the encoder 3 and detects the rotational position of the encoder rotor 15. The encoder rotor 15 rotates together with the rotary shaft 7 of the motor 1. The encoder 3 can detect the number of rotations of the drive motor 1 to limit the moving speed of the silver car or the like. Especially for a silver car, it is necessary to limit the maximum speed, so that the encoder 3 is greatly required. In addition,
In this embodiment, the encoder uses an optical encoder, but a magnetic encoder or the like may be used.

The motor case 4 surrounds the drive motor 1 and also serves as the yoke of the drive motor 1. The motor case 4 is formed by drawing a steel plate that is a magnetic material. The outer case of the bearing attached to the rotating shaft 7 on the opposite side of the drive motor 1 is supported by the motor case 4. Further, an internal thread hole 4a is formed on the end surface by burring for fastening an electromagnetic brake case 5 described later.

The electromagnetic brake case 5 is the electromagnetic brake 2
And surrounds the encoder 3 and has an opening on the side opposite to the load side of the drive motor 1. A hole through which the rotary shaft 7 of the drive motor 1 can pass is provided at the bottom of the electromagnetic brake case 5. Further, a foot portion 5a is provided at a fastening portion of the bottom portion of the electromagnetic brake case 5 to the motor case 4, and a female screw hole 5b is provided at an opening portion for fastening an electromagnetic brake case cover 6 described later. There is. The electromagnetic brake case 5 is formed by drawing or plastic molding.

Then, the motor case 4 is fastened to the female screw hole 4a by a bolt through the O-ring 16. At that time, the amount of compression of the O-ring 16 is determined by tightening bolts so that water does not enter the electromagnetic brake case 5. By doing so, the inside of the electromagnetic brake case 5 can be reliably waterproofed. Further, the fixed iron core 9 of the electromagnetic brake 2 is fixed by utilizing this fastening point. The electromagnetic brake case 5 is in contact with the fixed iron core 9 of the electromagnetic brake 2 and constitutes a magnetic circuit. Therefore, the magnetic flux leakage from the electromagnetic brake 2 is reduced, a large electromagnetic force can be obtained, and high performance or miniaturization of the electromagnetic brake 2 is possible.

Further, the electromagnetic brake 2 and the encoder 3
Of the drive motor 1 to the electromagnetic brake case 5
It can be performed separately from the assembling to the motor case 4. That is, the drive motor 1 can be assembled to the motor case 4, the electromagnetic brake 2 and the encoder 3 can be assembled to the electromagnetic brake case 5, and then both can be assembled. As a result, the work efficiency of the assembling is improved as compared with the conventional structure in which it is necessary to assemble the electromagnetic brake or the like integrally with the drive motor.

Further, since the electromagnetic brake case 5 has a bottomed cylindrical shape, when the electromagnetic brake 2 and the encoder 3 are assembled to the electromagnetic brake case 5, the electromagnetic brake 2 and the like may be housed inside. it can. That is, waterproofing at the time of assembly becomes possible.

The electromagnetic brake case cover 6 covers the opening of the electromagnetic brake case 5. Further, a foot portion 6a is provided at a place where the electromagnetic brake case 5 is fastened.
The electromagnetic brake case cover 6 is manufactured by drawing or plastic molding. Then, the fastening of the electromagnetic brake case cover 5 to the female screw hole 5b is performed by a bolt through the O-ring 17. In that case,
Similar to the fastening of the motor case 4 and the electromagnetic brake case 5, the compression amount of the O-ring 17 is determined. By doing so, the inside of the electromagnetic brake case 5 can be reliably waterproofed.

Although the present embodiment has been described with respect to a motor used for driving a silver car or the like, the present invention is applicable to any motor having an electromagnetic brake.

[0031]

According to the motor with an electromagnetic brake of the present invention, it is possible to improve waterproofness and assemblability while using an inexpensive frame and motor case.
An object of the present invention is to provide a motor with an electromagnetic brake for a vehicle, which can be waterproof when an electromagnetic brake and an encoder are assembled.

[Brief description of drawings]

FIG. 1 is a diagram showing a motor with an electromagnetic brake of the present invention.

FIG. 2 is a diagram showing a conventional motor with an electromagnetic brake.

FIG. 3 is a diagram showing a conventional motor with an electromagnetic brake.

[Explanation of symbols]

1 ... Drive motor 2 ... Electromagnetic brake 3 ... Encoder 4 ... Motor case 5: Electromagnetic brake case 6 ... Electromagnetic brake case cover 7 ... Rotation axis 8 ... Electromagnetic coil 9: Fixed iron core 10 ... Movable plate 11 ... Fixed plate 12 ... Brake shoes 13 ... Encoder board 14 ... Photointerrupter 15 ... Encoder rotor 16, 17 ・ ・ ・ O-ring

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J058 AA47 AA53 AA57 AA78 AA88                       BA26 BA60 CC07 CC72 CC77                       DB20 DC02 DC22 DE08 EA03                       EA13 FA42 FA50                 5H607 AA12 BB01 CC01 DD08 DD19                       EE07 EE13 EE19 FF24

Claims (5)

[Claims] 1. A drive motor for driving a vehicle, and an electromagnetic motor, which is arranged on the side opposite to the load side of the drive motor, and which energizes an electromagnetic coil to open a rotary shaft of the drive motor so as to be rotatable. A motor with an electromagnetic brake having a brake, comprising: a motor case that surrounds the drive motor and also serves as a yoke that forms a magnetic circuit; and a motor case that is fixed at the bottom to the motor case and surrounds the electromagnetic brake. An electromagnetic brake motor for a vehicle, comprising: a bottomed cylindrical electromagnetic brake case having an opening on an anti-load side of a motor for use in a vehicle; and an electromagnetic brake case cover closing the opening of the electromagnetic brake case. 2. The motor with an electromagnetic brake for a vehicle according to claim 1, wherein the electromagnetic brake case is made of a magnetic material, and a fixed iron core of the electromagnetic brake is in contact with the electromagnetic brake case. 3. The electromagnetic brake case is made of a metallic material and is formed by drawing.
Alternatively, the vehicle motor with an electromagnetic brake described in 2. 4. The motor with an electromagnetic brake for a vehicle according to claim 1, wherein the electromagnetic brake case is formed by plastic molding. 5. The vehicle further comprises an encoder surrounded by the electromagnetic brake case and the electromagnetic brake case cover to detect the rotation speed of the drive motor, and the vehicle is a silver car. The motor with an electromagnetic brake according to any one of items 1 to 5.