KR960011882B1 - A gear actuator for preventing the lock of an automobile brake - Google Patents

Abstract

A rear actuator for anti-lock brake system includes; a) a cylinder(100) having the first and second ports(110, 120) connected to the master cylinder(1), the third port(130) connected to the right rear wheel cylinder(2), and the fourth port(140) connected to the left rear wheel cylinder(3), b) check valves opening the oil path from the first port to the second port and from the second port to the fourth port individually, c) pistons(300a, 300b) built in the cylinder to operate the check valves. d) a core(400) built in the cylinder to pick up the pistons at the same time, e) a solenoid (500) built in the cylinder to lift the core by generating electro-magnetic force, and f) a coil spring(600) built inside the solenoid to obstruct the descent of the core.

Description

Rear Actuator for Automobile Brake Lock

1 is a cross-sectional view of a conventional general rear actuator.

2 and 3 are cross-sectional views of the operating state of the rear actuator according to the present invention.

* Explanation of symbols for main parts of the drawings

1: master cylinder 2: right rear wheel cylinder

3: left rear wheel cylinder 100: cylinder

200a, 200b: Check valve 300a, 300b: Piston

400: core 500: solenoid

600: coil spring

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear actuator for an anti-lock brake system of a vehicle for supplying or blocking hydraulic pressure to a rear wheel cylinder, and more specifically, a solenoid. The present invention relates to a solenoid valve for a brake locking device of a vehicle having a three-chanel.

The brake lock prevention device adjusts the hydraulic pressure of the brake according to the rotational state of the driving wheels and is useful for rapid braking. Especially, the brake locking device is applied to more and more vehicles because it shows excellent steering and braking power on slippery roads such as ice roads and rain roads. It is a trend.

The rear actuator in the brake lock prevention device acts to supply or shut off the hydraulic pressure so that the rear wheel cylinder can be increased, maintained, and decompressed when the brake lock device is operated.

1 shows a rear actuator conventionally used.

As shown in FIG. 1, a conventional rear actuator includes a first and second ports 11 and 12 connected to a master cylinder 1 and a right rear wheel cylinder 2 connected to a cylinder 10. A third port 13 and a fourth port 14 connected to the left rear wheel cylinder 3 are formed.

Then, check valves 20a and 20b are installed in the cylinder 10 so that a flow path is formed from the master cylinder 1 to the right rear wheel cylinder 1 and the left rear wheel cylinder 3, and the check valve 20a is provided. Pistons 30a and 30b for opening and closing the 20b are embedded in the cylinder 10. Then, there is a ball screw 40 for raising and lowering the pistons 30a and 30b so as to open and close the check valves 20a and 20b. In addition, a driving motor 50 capable of operating the ball screw 40 is required.

The rear actuator having such a structure operates the drive motor 50 according to the operation of the brake lock preventing device, thereby supplying or blocking the hydraulic pressure of the master cylinder 1 to the left and right rear wheel cylinders 2 and 3. The left and right rear wheel cylinders 2 and 3 are depressurized, held and increased. However, in the conventional rear actuator using the drive motor 50, when the brake lock preventing device is broken and the current is cut off from the drive motor 50, the check valves 20a and 20b are closed. Therefore, even during normal brake operation, the hydraulic pressure from the master cylinder 1 to the left and right rear wheel cylinders 2 and 3 is interrupted and there is a problem in that braking is not performed.

An object of the present invention is to ensure that the normal braking force can be exerted by not affecting the basic brake device even if the brake lock preventing device is abnormal.

With reference to the accompanying drawings, a preferred embodiment according to the object of the present invention will be described in detail. 2 and 3 are cross-sectional views of an operating state showing the configuration of the present invention.

As shown, the present invention is the first and second ports 110 and 120 connected to the master cylinder 1, the third port 130 connected to the right rear wheel cylinder 2, the left rear wheel cylinder ( A cylinder 100 formed with a fourth port 140 connected to 3); A check valve installed in the cylinder 100 such that a flow path is formed in the direction from the first port 110 to the third port 130 and from the second port 120 to the fourth port 140, respectively. 200a, 200b); Pistons 300a and 300b embedded in the cylinder 100 to open and close the respective check valves 200a and 200b; A core 400 embedded in the cylinder 100 so that the pistons 300a and 300b can be simultaneously raised and lowered; A solenoid 500 embedded in the cylinder 100 to elevate the core 400 by applying an electric current; It is characterized by consisting of a coil spring 500 embedded in the inner diameter portion of the solenoid 500 to prevent the fall of the core 400 within a predetermined range.

In the present invention configured as described above, the elastic modulus of the coil spring 600 should be so large that the piston (300a, 300b) and the core 400 is not lowered by the hydraulic pressure of the master cylinder (1).

According to the present invention configured as described above, when the brake lock preventing device does not operate, the pistons 300a and 300b open the check valves 200a and 200b so that the hydraulic pressure of the master cylinder 1 is left and right rear wheel cylinders 2. 3). However, when the brake lock preventing device is operated during the brake operation, the hydraulic pressure of the left and right rear wheel cylinders 2 and 3 is increased, maintained, or reduced depending on the condition of the wheel.

At the time of pressure increase, as shown in FIG. 2, a sensation current is applied to the solenoid 50 to move the core 400 upward. Therefore, when the pistons 300a and 300b open the check valves 200a and 200b, pressure oil flows from the master cylinder 1 to the left and right rear wheel cylinders 2 and 3, thereby increasing the hydraulic pressure.

At the time of holding | maintenance, as shown in FIG. 3, a strong current flows to the solenoid 500 in the downward direction of the core 400, and the core 400 falls. Therefore, the piston (300b) is lowered to block the check valve (200a, 200b) to maintain the hydraulic pressure of the left and right rear wheel cylinder (2, 3).

At the time of depressurization, a weak current is applied to the solenoid 500 so that the positions of the pistons 300a and 300b shown in FIG. The hydraulic pressure of the left and right rear wheel cylinders 2 and 3 is reduced in proportion to the moving length of.

On the other hand, the present invention is the core 400 is raised by the elastic force of the coil spring 600 even if the current supply to the brake lock prevention device is stopped while the piston (300a, 300b) is lowered during the operation of the brake lock prevention device The valves 200a and 200b are opened by the pistons 300a and 300b. Therefore, since hydraulic pressure flows from the brake operation master cylinder 1 to the left and right rear wheel cylinders 2 and 3, normal braking force is generated.

As such, the present invention operates the pistons 300a and 300b by using the solenoid 500 when the brake lock preventing device is operated to open and close the check valves 200a and 200b, and the coil spring 600 when the brake lock preventing device is broken. By the restoring force of the 첵 valves (200a, 200b) is opened, so that the basic brake device is operated, the braking force is generated even in the event of failure of the brake lock prevention device can be operated safely.

Claims (1)

First and second ports 110 and 120 connected to the master cylinder 1, a third port 130 connected to the right rear wheel cylinder 2, and a fourth port connected to the left rear wheel cylinder 3. A cylinder 100 formed with 140; A check valve installed in the cylinder 100 such that a flow path is formed in the direction from the first port 110 to the third port 130 and from the second port 120 to the fourth port 140, respectively. 200a, 200b); Pistons 300a and 300b embedded in the cylinder 100 to open and close the respective check valves 200a and 200b; A core 400 embedded in the cylinder 100 so that the pistons 300a and 300b can be simultaneously raised and lowered; A solenoid 500 embedded in the cylinder 100 to elevate the core 400 by applying an electric current; The rear actuator for a brake locking device of a vehicle, characterized in that the coil spring 600 is built in the inner diameter of the solenoid 500 so as to prevent the fall of the core 400 within a predetermined range.