Pressure Regulator Drive Parts
1 - pressure regulator; 2 – axis of the regulator drive lever; 3 - dirt cap; 4 - locking plate; 5 - bolt with spring washer; 6 - rear axle; 7 – thrust connecting the pressure regulator drive lever with the bracket of the rear axle beam; 8 - bolt nut; 9 - plastic sleeve; 10 - spacer sleeve; 11 – a bolt of fastening of draft; 12 - pressure regulator drive lever; 13 – a nut for fastening of a bracket to a body; 14 - spring washer; 15 - flat washer; 16 - bracket for fastening the pressure regulator drive lever; 17 - rubber bushing
Rear brake pressure regulator in non-working position
A - normal pressure cavity; В – cavity of regulated pressure; P is the force transmitted by lever 4 of the regulator drive; 1 – regulator housing; 2 - spacer sleeve; 3 - sealing ring; 4 – regulator drive lever; 5 - gasket; 6 - plug; 7 - rubber seal; 8 - spring plate; 9 - piston spring; 10 - piston
Regulator 19 is connected to the rear brake drive circuit (see fig. Brake system diagram) pressure, which corrects the pressure in the rear brake drive depending on the position of the body relative to the rear axle beam, i.e., depending on the vehicle load. It acts as a restrictor valve, automatically cutting off the flow of brake fluid to the rear brakes, reducing the chance of rear wheel skidding when braking.
The regulator is mounted on the body bracket and connected to the rear axle beam through the torsion lever 12 (see fig. Pressure Regulator Drive Parts) and thrust 7. The other end of the torsion lever acts on the piston 10 (see fig. Rear brake pressure regulator in non-working position).
Fluid enters cavity A from the master cylinder, and from cavity B it exits into the wheel cylinders of the rear brake drive.
The force P acting on the piston from the torsion lever increases as the body approaches the axle beam and decreases as it moves away from the rear axle beam.
Prior to the start of the action of the regulator, the piston rests against the plug 6 under the action of the force P and the spring 9. In this case, gaps are formed through which the cavities A and B communicate, i.e. the pressure in them will be the same and equal to the pressure in the hydraulic brake drive.
When the brakes are applied, the rear of the car rises by inertia and, consequently, the pressure on the piston from lever 4 decreases. The force of fluid pressure on the upper end of the piston with a larger surface area at some point exceeds the pressure force of the fluid acting on the piston from below, and the piston goes down until it stops in seal 7. At the same time, cavities A and B are separated and different pressures are created in them: in cavity A it will be equal to the pressure in the main cylinder, and in cavity B the pressure will be less by the value that determines the balance of the piston, under the action of pressures in cavities A and B, springs 9 and the force of the torsion lever.
Thus, partial or complete separation of cavities A and B by piston 10 regulates the braking torque on the rear wheels.