JPH075004Y2 - Electric booster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pressure booster that generates a hydraulic pressure source for braking a wheel of a railway vehicle or an automobile with a disc brake.

(Prior Art) When braking a brake disk, the conventional structure is such that pressurized air is flown into the air inlet 13 as shown in FIG.
The diaphragm 12 attached to the chamber body 14 moves leftward in the illustrated example, and the push rod 10 pushed rightward by the return spring 11 is pushed leftward by the pressure of the diaphragm 12.

By the way, a cylinder 8 is provided at the tip of the push rod 10, and the cylinder 8 is a cylinder body 2.
The oil in the cylinder body 2 in the state of being sealed by the oil seal 6 inside is compressed by the cylinder 8 and the pressure is braked by operating a disc brake (not shown) through hydraulic piping.

To release the control, the pressure of the air inlet 13 is released to move the push rod 10 and the diaphragm 12 to the right by the force of the return spring 11.
Further, the cylinder 8 moves to the right by the force of the piston return spring 4 to release the pressure of the oil 14. If there is an oil leak at this time, the valve 5 causes the valve stop 7 to supply the oil in the oil reservoir 15 through the valve 5 and supply the amount of the oil leak.

In the drawing, 1 is a bleeder, 3 is a pipe joint, and 9 is a bracket.

(Problems to be solved by the invention) Since the conventional one uses the pressure air as the power source as described above, a compressor, an air reservoir, and an operating device for controlling the pressure of the pressure air are required. Such problems will occur.

The compressor was noisy and caused environmental problems.

Since a compressor, a working device, and an air reservoir were required, a large outfitting space was required.

Due to the reliability of the compressor, at least two trains are usually used in one train so that one train may be out of order, which makes it expensive and heavy.

Since it uses air, the rise time of the brake was getting longer.

(Means for Solving the Problem) The present invention is intended to solve the above-mentioned problems, in which the drive unit of the booster is a motor with a reduction gear brake, the output shaft is a screw or a ball screw, and the housing is Inside, a coil spring is stretched between the nut or ball screw nut that moves forward and backward by screwing with it and the collar body provided on the back side of the push rod for pressing the oil compression cylinder from the back side. The structure is characterized in that the cylinder is pressed by a pressure corresponding to the compression amount of the coil spring, and a return spring is stretched between the inner side wall of the housing and the side of the collar body opposite to the coil spring. .

(Embodiment) The present invention is as shown in FIG. 2 in which a housing 20 is provided with an electric motor 21 with a reduction gear brake. Then, the output shaft is a screw or a ball screw 22, and the electric motor with reduction gear brake 21 is rotated when braking is performed. As a result, the ball screw 22 rotates, and at this time, the ball screw nut 23 screwed into the ball screw 22 is moved forward and backward (a) and (b) without rotating.

Specifically, guide rollers 24 are provided on the left and right ends of the ball screw nut 23, and the guide rollers 24 are fitted in the guide grooves formed on the inner surface of the housing 20, so that the guide rollers 24 can move forward and backward without rotating ( A) (b) will be done,
In this forward movement in the direction (a), the coil spring 26 installed between the push rod 25 and the collar body 25a is compressed. Then, the push rod 25 and the cylinder 27 arranged in front of the push rod 25 are pushed, so that the oil in the cylinder body 28 is compressed and the disc brake is operated by the pressure to perform braking. On the other hand, the braking force is retained by closing the pressure.

On the other hand, releasing the control causes the electric motor with reduction gear brake 21 to rotate in the reverse direction, which causes the nut 23 for the ball screw to move backward in the (b) direction.
The compression of 26 is released, and at the same time, the cylinder 27 and the push rod 25 are pushed by the piston return spring 29 to release the oil sealing pressure.

In this case, 30 is a valve, 31 is a valve stop, and 32 is a return spring.

In the present invention, the braking force is an electric motor with a speed reducer brake.
Encoder 33 mounted on the rear axle of 21 can detect.

(Effects of the Invention) The present invention is configured as described above and has the following excellent operational effects.

(1) Since the power source is changed from pressurized air to electricity, a compressor is not required, and the noise is low and the influence on the environment is almost eliminated.

(2) The equipment space is widened due to the compactness of the device, such as eliminating the need for an air reservoir related to the compressor.

(3) Since an encoder (tachogenerator) is provided on the main shaft and the deceleration is calculated by the computer to control the braking force, the conventional operating device becomes unnecessary.

(4) The reliability is secured and improved by making the above computer a duplex system or more.

[Brief description of drawings]

FIG. 1 is a partially broken sectional view of the conventional device, and FIG. 2 is a partially broken sectional view of the device of the present invention. 2 …… Cylinder body, 8 …… Cylinder 21 …… Reducer Brake motor 23 …… Ball screw nut 25 …… Pushrod, 26 …… Coil spring 27 …… Cylinder 29 …… Piston return spring

Claims (1)

[Scope of utility model registration request] 1. A nut, a nut for a ball screw, and a cylinder for oil compression, wherein the drive unit is an electric motor with a reduction gear brake, the output shaft is a screw or a ball screw, and the nut or ball screw nut and the oil compression cylinder are screwed together with the output shaft to move forward and backward. A coil spring is stretched between the push rod and the collar body provided on the back side of the push rod for pushing from the back side so that the cylinder is pushed by the pressure corresponding to the compression amount of the coil spring. An electric pressure booster characterized in that a return spring is stretched between the housing inner surface wall and the side opposite to the spring.