SU1512839A1 - Main braking cylinder - Google Patents

Abstract

The invention relates to hydraulic brakes of mobile machines and mechanisms. The purpose of the invention is to increase reliability. The main brake cylinder consists of a housing 1 and two working pistons 5, 9. Pistons 5, 9 are made with through holes in which plungers 7, 11 are installed. Plunger 7, which interacts with a spring-loaded rod 15, is equipped with a spring 8. A cavity 14 is connected to a reservoir 3 brake fluid line, in which the check valve 13 is placed and the normally open valve 17 controlled by the stem 15 is located parallel to it. The pressure of the fluid in the cylinder is created by the applied force and is determined by the cross-sectional area of the piston 5 or 9 to which This is a force. During operation in the cylinder, initially, the pressure of the fluid is created by the cross-sectional area of the piston 5 or 9 and the plunger 7 or 11, and then only the plunger 7 or 11. 1 sludge.

Description

one

(21) 4340105/27-11

(22) 12/07/87

(46) 10/07/89. Bksh. 37 (75) V.D.Kurapov

(53) 629.113-59 (088.8)

(56) USSR author's certificate 1062069, cl. B 60 T 11/16, 1982.

(54) MAIN BRAKE CYLINDER

(57) The invention relates to hydraulic brakes of mobile machines and mechanisms. The purpose of the invention is to increase reliability. The brake master cylinder consists of a body

1 and two working pistons 5, 9. Pistons 5, 9 are made with through holes, in which plungers 7, 11 are installed. in which the check valve 13 is placed and the normally open valve 17 controlled by the rod 15 is located. The fluid pressure in the cylinder is created by the applied force and is determined by the cross-sectional area of the piston 5 or 9 to which the force is applied. During operation in the cylinder, initially, the pressure of the fluid is created by the cross-sectional area of the piston 5 or 9 and the plunger 7 or 11, and then only the plunger 7 or 11. 1 sludge.

with f

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I 1 I and

10 h 9 k.

1 5 7

3. 151

The invention relates to the field of hydraulic actuators, and more specifically to the hydraulic drive of the brake devices of mobile machines, and can be used in brake devices with hydraulic drive.

The aim of the invention is to improve the reliability of the master brake cylinder.

The drawing shows the main brake cylinder, a longitudinal section.

The master brake cylinder has a housing 1, which is connected by hydraulic inlet lines 2 to a reservoir 3 brake fluid, output lines 4 to working brake cylinders, the first working piston 5, the spring of which is under the influence of spring 6j.B includes a plunger 7, and the force on the piston from the plunger side is transmitted by means of a spring 8, the second working piston 9 under the influence of the spring 10, into the opening of which a plunger 11 acting on the piston through the spring 12, a check valve 13, passes yuschy brake fluid in only one direction from the reservoir to the cavity of the stem 14 controlled liter emy additional piston 15 with a rod comprised within exposed .PVUZHINY 16, normally open valve 17 is open in the starting position of the stroke.

The main brake cylinder operates as follows.

The reservoir 3, the attached hydraulic lines 2 and 4, all the cavities of the main brake cylinder and the working brake cylinders are filled with brake fluid. The force applied to the additional piston 15 acts on the plunger 7 and through the spring 8 on the piston 5. Under the action of this force, the plunger 7 and the working piston 5 move, resulting in a discharge in the rod cavity 14 the valve 17, and after it is closed through the check valve 13, the brake fluid flows from the tank 3; brake fluid from the cavity in front of the piston is applied to the working brake cylinders, which supply the brake pads to the brake drum. The pre-tension force of the spring 8 is selected from the condition of guaranteed supply

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5 0 5 0 5

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brake pads to the brake drum while simultaneously moving the piston 5 and the plunger 7. As soon as the force from the brake fluid pressure in the cavity in front of the piston 5 is greater than the spring force 8, the spring begins to compress, the working piston 5 stops and only the plunger 7 moves. in front of the piston, it begins to increase in direct proportion to the force acting on the plunger 7, and inversely to the cross sectional area of the plunger. When the piston 5 is stopped, the check valve 13 is closed. Thus, the brake fluid in the rod end is closed; and therefore keeps the piston 5 from moving backwards under the action of increasing force in the cavity in front of the piston. A further increase in the brake fluid pressure in the cavity in front of the piston after it stops occurs with a slight movement of the plunger 7, determined by the volume and elasticity of the brake fluid under pressure and the rigidity of the hydraulic line in which this brake fluid is located.

When the control force is removed, the plunger 7 under the action of the spring 8 returns to its original position relative to the piston 5 and in this position the piston 5 remains until the additional piston with the rod 15 under the action of the spring 16 returns to its original position and opens the normally open the valve 17, after which the working piston 5 is returned to its original position by the action of the spring 6. Under the influence of the spring 10, the second working piston 9 divides the cavity in front of the first working piston into two hydraulic systems independent of each other. With hermetically sealed both systems in each, the pressure system is equal to each other and is determined by the operation of the first working piston. When a control force is applied, the second working piston moves, and when this force is removed, it returns to its original position under the action of the spring 10. In the event of a leak in one of the hydraulic systems, the fluid pressure in it is not created, as a result of which the first

5151

the working piston 5 the second working piston 9 together with the plunger 11 or rests into the cylinder body or respectively into the piston 5 and the plunger 7. the piston and pressure is created only in a pressurized hydraulic system.

Claims (1)

Claims of the Invention A master brake cylinder comprising two sections, 8 of which are sequentially installed spring-loaded working pistons with recuperation valves, separating cavities communicated with a reservoir and brake linings, characterized in that it is equipped with an additional piston with a rod in order to ensure operational reliability installed in the cavity in front of the first piston, separated A partition in the housing with a central and at least one peripheral hole, an additional piston is spring-loaded relative to the indicated partition, the stem of the additional piston is passed through with a seal through the central opening of the partition and is formed with longitudinal slots with the walls of the central hole, the cavity in which the additional piston is installed is connected to the reservoir and through the peripheral channel in the partition, equipped with a check valve, to the polo ti yorshnem between the first and the partition, each working piston vsholnen a central hole in which a plunger spring loaded towards the driven flyback n & rshn, the plunger of the first operating piston is located to cooperate with the end additional piston rod.