JPH08177900A - Brake device - Google Patents

Abstract

PURPOSE: To effectively utilize function which is provided in a constitution member itself. CONSTITUTION: A vibration device 20 is brought in contact with the one side surface of a rotor 10, and voltage is applied on the piezoelectric body 22 of the vibration device 20 so as to generate elliptical vibration on a vibration body 24. When the rotor 10 is rotated in an arrow A direction, for example, when advance wave is generated in the same arrow B direction as the rotating direction A of the rotor 10 on a contact surface 21 of the rotor 10 of a vibration device 20 by elliptical vibration, a torque is generated on a direction (an arrow C direction) opposite to the rotating direction A of the rotor 10 on the contact surface 21. Therefore, the torque becomes brake force which is acted in direction for stopping the rotor 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for stopping a moving body, and more particularly to a brake device for a vehicle.

[0002]

2. Description of the Related Art As a conventional braking device, for example, a vehicle braking device, a device in which a friction member is pressed against a disk rotor to brake a wheel is generally well known.
As the pressing means here, in addition to pressing by hydraulic pressure using a DC motor, a pump, etc., as described in JP-A-2-57731 and JP-A-5-321961, the There is a device using a sonic motor.

According to this, as shown in FIG. 7, a caliper 50, a disk rotor 52 that rotates together with wheels, a pad 54 that holds the disk rotor 52 during braking,
A piston 56 that presses the pad 54 when the brake is applied,
The ultrasonic motor 60, which serves as a pressing drive source for the piston 56, has a rod 58 that is screwed onto the output shaft 62 of the ultrasonic motor 60. The rod 58 moves in the axial direction by driving the ultrasonic motor 60, and the piston 56 moves. The pad 54 is pressed against the disc rotor 52.

[0004]

However, in the above-mentioned structure, the rotational force of the motor is converted into a linear movement, and the pad is used to press the disc rotor. Instead of the DC motor and the pump, the ultrasonic motor and the piston are used. It seems that the rod was used only, and there is no change in the final braking principle. Therefore, a drastic reduction in the number of constituent parts has not been reached.

An object of the present invention is not only to reduce the number of parts, but also to provide a brake device that enables effective utilization of the functions of the components themselves.

[0006]

In order to solve the above-mentioned object, the invention according to claim 1 comprises a moving body which moves in an arbitrary direction, and a piezoelectric body and a vibrating body which come into contact with the moving body. A vibration device and a control device that causes the vibration device to generate a vibration wave in the same direction as the direction, and is a braking device that stops the moving body by the vibration wave of the vibration device.

According to a second aspect of the present invention, there is provided a vibrating device comprising a moving body which moves in an arbitrary direction, a sensor which detects a moving speed of the moving body, a piezoelectric body and a vibrating body which are in contact with the moving body. And a control device for generating a vibration wave in the same direction as the vibration device and controlling the vibration wave to a desired vibration wave by an output signal from the sensor. The braking device is characterized by stopping the moving body.

[0008]

The moving body moving in an arbitrary direction comes into contact with the vibrating device, and when a voltage is applied to the piezoelectric body from the control device at this time, the piezoelectric body vibrates, and this vibration propagates to the vibrating body and is transmitted to the vibrating body surface. Vibration waves are generated. Here, the control device controls the direction of the vibration wave to be the same as the moving direction of the moving body. Then, torque is generated in the direction opposite to the direction of the vibration wave. That is, torque is generated on the surface of the vibrating device in a direction opposite to the moving direction of the moving body, and when the moving body and the vibrating device come into contact with each other, the torque acts in a direction in which the moving body is prevented from moving. Therefore, when the vibrating device is operated as described above when the moving body and the vibrating device are in contact with each other, the vibrating device tries to brake the moving body.

Further, when the moving body moving in an arbitrary direction comes into contact with the vibrating device, and when a voltage is applied to the piezoelectric body from the control device at this time, the piezoelectric body vibrates, and this vibration propagates to the vibrating body and vibrates. Vibration waves are generated on the surface. Here, the control device controls the direction of the vibration wave to be the same as the moving direction of the moving body. Then, torque is generated in the direction opposite to the direction of the vibration wave. That is, torque is generated on the surface of the vibrating device in a direction opposite to the moving direction of the moving body, and when the moving body and the vibrating device come into contact with each other, the torque acts in a direction to prevent the moving body from moving. Here, the torque can be controlled by detecting the moving speed of the moving body by a sensor, and by making the control device generate a vibration wave as a result of the detection. Therefore, when the moving body and the vibrating device are in contact with each other, the vibrating device is operated as described above, and if the torque is controlled, the vibrating device attempts to brake the moving body while adjusting the braking force.

[0010]

According to the present invention, a vibrating device for generating torque in the direction opposite to the moving direction of the moving body is brought into contact with the moving body, so that not only frictional force due to the contact but also the contact surface is generated. By applying the torque, more accurate braking can be performed with a simple structure.

[0011]

First, a well-known ultrasonic motor is shown in FIGS. Usually, an ultrasonic motor is composed of a stator, which is a piezoelectric body and a vibrating body, and a rotor, which is a moving body. When a voltage is applied to the piezoelectric body from a drive circuit (including a power source), an elliptical vibration is generated in the vibrating body. The rotor is rotated by bringing the rotor into pressure contact with the stator. Then, the rotation direction of the rotor can be changed by changing the vibration direction of the elliptical vibration.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4 in consideration of the case where a traveling wave is generated on the surface of a vibrating body by the above-mentioned principle, for example, by the elliptic vibration.

A first embodiment is shown in FIGS. 1 and 2. FIG. 1 is a schematic configuration diagram of a braking device, and FIG. 2 is a perspective view showing a braking principle. The rotating body 10 is a disk type that rotates about a shaft 30 as a center of rotation, and the vibrating device 20 is composed of a piezoelectric body 22 and a vibrating body 24 that have substantially the same configuration as the stator of the ultrasonic motor described above, and is held by the shaft 30. Has been done.
One side surface (hereinafter referred to as a contact surface with the vibration device) 11 of the rotary body 10 and one side surface 21 (hereinafter referred to as a contact surface with the rotary body) 21 of the vibration device 20 are brought into contact with each other. That is, the rotating body 10 and the vibrating body 24 are brought into contact with each other. And the piezoelectric body 22
A control circuit is connected to the.

In the above structure, when a voltage is applied from the control circuit 40 to the piezoelectric body 22 as in the well-known traveling wave type ultrasonic motor driving method, the surface of the vibrating body 24, that is, the vibrating device 20.
A traveling wave is generated on the contact surface 21 with the rotating body at. At this time, when the rotating body 10 is rotating in the arrow A direction,
The control circuit 40 controls the voltage application so that the traveling wave travels in the direction of arrow B. Then, a force for rotating the member in contact with the contact surface of the vibration device 20 with the rotating body in the direction of arrow C is generated. That is, a force for rotating the rotating body 10 rotating in the arrow A direction in the direction opposite to the arrow A direction is generated in the vibration device 20.

Therefore, since the rotational force of the rotating body 10 in the direction of arrow A and the force of the vibrating device 20 applied in the direction of arrow C cancel each other, a traveling wave in the direction of arrow B is applied to the vibrating device. From the time of generation, the braking force acts on the rotating body 10. The greater the force applied to the vibration device 20 in the direction of arrow C, the greater the braking force acting on the rotating body 10.

The control of the braking force can be controlled by the control circuit 40, and concretely, there are drive frequency control and voltage control. Furthermore, it is also possible to change the physique of the vibration device 20 or change the contact force of the vibration device 20 with respect to the rotating body 10.

Further, as shown in FIG. 1 (b), the rotation speed detecting device 45 is attached to the rotating body 10 and the rotation speed is sequentially fed back to the control circuit 40 to generate an optimum braking force in the vibration device. Is also possible. Further, if the rotation speed of the rotating body 10 is detected by the rotating speed detecting device 45, the control circuit 40 controls the strength of the braking force so that the rotation of the rotating body 10 is not locked, or the voltage is applied to the piezoelectric body 22. It can be operated also as a so-called anti-lock brake by connecting and disconnecting.

The second embodiment is shown in FIG. The same components as those in the first embodiment are designated by the same reference numerals. This is an example of using the present invention in various vehicles having wheels 12. The rotating body 1 is attached to the rotating shaft 32 that rotates together with the wheels 12.
Fix 0. The vibration device support shaft 34 is provided on the outer periphery of the rotary shaft 32.
And the vibration device supporting shaft 34 supports the vibration device 20. In the case where the braking force is not required in the above structure, as shown in FIG.
When 0 is separated and the braking force is required, the vibrating device 20 is pressed along the vibrating device supporting shaft 34 by a pressing means (not shown) and pressed against the rotating body as shown in FIG. 3B. At the same time as pressing, the braking force is generated on the contact surface 21 of the vibration device 20 with the rotating body 10 to stop the rotation of the rotating body 10 as in the first embodiment.

Note that the braking force may be generated in the vibration device 20 while the vibration device 20 and the rotating body 10 are separated from each other. The control of the braking force in this embodiment is also the same as that described in the first embodiment. Further, the pressing means makes contact / contact between the rotating body 10 and the vibration device 20.
The braking force can be controlled even if non-contact is controlled.

A third embodiment is shown in FIG. This is an example in which the present invention is used for a moving body 15 that moves linearly such as a belt conveyor. The difference from the first and second embodiments is that the vibrating device 25 is a square type instead of a disc type. is there. Regarding the operation of the braking force, the moving body 1
When the vibrating device 25 including the piezoelectric body 27 and the vibrating body 29 is brought into contact with 5 and a traveling wave is generated in the same direction as the moving direction of the moving body 15 (arrow D), the moving direction is opposite to the moving direction (arrow F). A braking force is generated to stop the moving body 15.

In the first to third embodiments described above, the vibration device 2 is provided on one side surface of the rotating body 10 or the moving body 15.
Although 0 or the vibration device 25 is arranged, it may be arranged on both side faces to sandwich the rotating body 10 or the moving body 15.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a brake device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a braking principle.

FIG. 3 is a configuration diagram of a brake device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a brake device according to a third embodiment of the present invention.

FIG. 5 is a partial cross-sectional perspective view of a conventionally known disc type ultrasonic motor.

FIG. 6 is a partial cross-sectional perspective view of a conventionally known annular type ultrasonic motor.

FIG. 6 is a diagram showing a conventional brake device using an ultrasonic motor.

[Explanation of symbols]

 10 Rotating Body 15 Moving Body 20 Vibrating Device 25 Vibrating Device 40 Control Circuit 45 Rotational Speed Detection Device

[Procedure amendment]

[Submission date] March 31, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a brake device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a braking principle.

FIG. 3 is a configuration diagram of a brake device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a brake device according to a third embodiment of the present invention.

FIG. 5 is a partial cross-sectional perspective view of a conventionally known disc type ultrasonic motor.

FIG. 6 is a partial cross-sectional perspective view of a conventionally known annular type ultrasonic motor.

FIG. 7 is a diagram showing a conventional brake device using an ultrasonic motor.

[Explanation of reference numerals] 10 rotating body 15 moving body 20 vibrating device 25 vibrating device 40 control circuit 45 rotational speed detecting device

Claims (2)

[Claims] 1. A moving body that moves in an arbitrary direction, a vibrating device that is in contact with the moving body and that includes a piezoelectric body and a vibrating body, and control that causes the vibrating device to generate a vibration wave in the same direction as the vibrating direction. A brake device, comprising: a device, wherein the moving body is stopped by a vibration wave of the vibration device. 2. A moving body which moves in an arbitrary direction, a sensor which detects a moving speed of the moving body, and a vibrating device which is in contact with the moving body and includes a piezoelectric body and a vibrating body, and the vibrating device, A control device that generates a vibration wave in the same direction as the direction and controls the vibration wave to a desired vibration wave by the output signal from the sensor, and stops the moving body by the vibration wave of the vibration device. Brake device characterized by being made.