SU1390092A1 - Vehicle braking system - Google Patents

Abstract

This invention relates to a transport industry. The purpose of the invention is to increase the durability by eliminating the influence of the pneumatic suspension. brake force regulator when braking effects are applied /

Description

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Noah crane. The lever 2 of the regulator 1 is connected with the stem 4 of the pneumatic cylinder 5 connected to the air suspension through the accelerating valve 6. When the brake valve is exposed to valve 6

connects the pneumatic cylinder 5 to the air suspension, and the lever 2 takes the position corresponding to the axial load value. 1 il.

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This invention relates to motor vehicles equipped with a combined or pneumatic suspension and pneumatically actuated brakes.

The aim of the invention is to increase durability by eliminating the influence of the air suspension on the brake force regulator in the absence of effects on the brake valve.

The drawing shows a part of the brake system of the brake actuator circuit with brake force regulator, pneumatic cylinder, accelerator valve and a diagram of their connection.

The brake system includes a brake force regulator G, to the lever 2 of the regulator is connected through a rubber bushing 3 a piston rod 4 of the pneumatic cylinder 3, which is connected through an acceleration valve 6 through an acceleration valve 6. The brake force regulator 1 comprises an upper body 7, a lower body 8 and a guide cap 9. In the upper part of the body there is a piston 10 with inclined ribs 11 and a valve seat 12 in the upper part of the piston and a guide 13. The central part of the diaphragm 14 is attached to the piston 10 and its outer edges are clamped between the upper and lower parts of the body in the fixed insert 15. The movable pusher 16 interacts with the valve 12 in the upper part, and in the lower part through the ball pin 17 and the piston 18 interacts with the brake forces lever 2 .

The space under the piston 18 is connected by a tube with a space in the upper housing 7. A 5-cylinder pneumatic cylinder holds the piston rod 4, the return spring 19, the housing 20, the cover 21, the bottom 22 of the cylinder and the stud 23, with the rubber sleeve 3 and the lever 2 mutually 10

15

20

2

acts with the valve mechanism of the brake force regulator and is connected by a pneumatic actuator to the accelerating valve 6. The latter consists of a body 24, in which there are four outputs: to the brake valve, air suspension, pneumatic cylinder 5 and atmospheric, piston 25, exhaust valve 26, intake valve 27, springs 28, and valve hollow body 29 interacting under the action of air pressure drops when braking in the pneumatic system of brakes and air suspension.

Brake system works as follows.

When the brake pedal is pressed, the compressed air through the brake valve, which provides the following action depending on the force on the pedal, enters the accelerating valve 6 and the brake force regulator 1. Under the action of compressed air, the piston 25 of the accelerator valve 6 moves down and first closes the outlet valve 26, and then opens the inlet valve 27. Air from the air suspension. Under pressure, proportional to the axial load, flows through the accelerating valve 6 into the pneumatic cylinder 5, moves the piston rod 4, the rubber bushing 3 and rotates the lever 2 of the brake force regulator 1, from. the position of which depends on the relative position of the pusher 16, the insert 15, the piston 10. When moving the lever 2 down, the valve 12 is detached from the piston seat, providing the maximum pressure of air transferred from the brake valve to the brake chambers proportional to the axial load. When the pressure in the line from the brake valve decreases, piston 25 due to higher air pressure 45

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in the air suspension, it moves upwards and is detached from the exhaust valve 26, the compressed air from the pneumatic cylinder 5 through the open exhaust valve 26 and the hollow valve body 29 is released to the atmosphere, and the air suspension is cut off by the inlet valve 27, which is pressed by the spring 4 by the return valve the spring 19 is moved upwards and through the rubber bushing 3 rotates the lever of the brake force regulator 1 upwards, providing the minimum pressure of air supplied from the brake crane to the axial load bremsstrahlung cameras.

When compressed air is supplied from the brake valve to the brake force regulator 1, it acts on the upper part of the piston 10, causing it to move downwards. At the same time, the compressed air enters the tube under the piston 18, which moves up and presses against the pusher 16 and the ball plate .17, which is together with the lever 2 of the regulator 1 of the brake SI.P in the position set by the rod 4 of the pneumatic cylinder 5 proportional to the soybean load . As the piston 10 moves downward, the intake valve 12 presses against the outward seat of the movable pusher 16. As the piston 10 moves further, the inlet valve 12 is detached from the seat in the piston 10 and compressed air from the brake valve flows to the brake chambers.

At the same time, compressed air through the annular gap between the piston 10 and the guide 13 enters the cavity under the diaphragm 14, and the latter begins to press down on the piston 10 from below. When reaching the output to the brake chambers pressure, the ratio of which to the pressure on. the inlet from the brake valve corresponds to the ratio of the active areas of the upper and lower sides of the piston 10, the latter rises until the inlet valve I2 is seated on the outer seat of the piston 10, and the inflow of compressed air is stopped. In this way, the follow-up action of the controller is performed. The active area of the upper side of the piston 10 remains always constant, and the active area of the lower side of the piston, which through the diaphragm 14 acts on the compressed air.

the spirit applied to the brake chambers is constantly changing due to the change in the relative position of the inclined ribs P of the moving piston 10 and not. the movable insert 15. The mutual position of the piston 10 and the fixed insert 15 depends on the position of the lever 2 and the pusher 16 connected to it through the ball p 0 that 17. In turn, the position of the lever 2 depends on the axial load. Therefore, with the lowest position of the pusher 16 (minimum axial load) pressure difference

5 compressed air at the inlet and outlet of the regulator 1 braking force is greatest, and at the extreme upper position. pusher 16 (maximum thrust and load) these pressures equalize.

0 Thus, the brake controller

forces automatically maintains ha vshode to the brake chambers of the pressure of compressed air, providing the desired braking force proportional to

5 axial load acting during braking.

When braking, the pressure in the trunk of the brake valve drops. The piston 10 under the pressure of compressed air acting on it through the diaphragm 14 from below moves upwards and lifts the valve 12 from the outlet seat of the pusher 16. Compressed air from the brake chambers escapes through the pusher and the outlet closed with a rubber valve into the atmosphere.

Claims (1)

Invention Formula 0 Brake system of the vehicle, containing a brake valve connected to the wheel brake chambers through the brake force regulator, in the case of which the valve unit is located, controlled by a rotary lever pivotally connected with the stock. the spring-loaded piston is a pneumatic cylinder, the working cavity of which is in communication with the air suspension, which is, in order to increase durability, by eliminating the influence of the air suspension on. the brake force regulator with no impact on the brake valve, it 5 is provided with an acceleration valve linking the working cavity of the pneumatic cylinder with an air suspension, wherein the control cavity of the accelerating valve is connected to the brake valve.