CS275854B6 - Master Cylinder for Hydraulic Brake Control - Google Patents

Abstract

A master cylinder for controlling hydraulic brakes, the piston (4) of which is in the basic position with preload supported by the first arm (8) of the control member (9). The second arm (10) of the control member (9) rests on a fixed stop. The axis eliminates play in the control and releases the return spring of the control member (9).

Description

The invention relates to a master cylinder for actuating hydraulic brakes.

The master cylinder is usually operated by a pedal or lever that moves the piston via a button. In the basic position, the spring-pushed piston is supported on a stop formed by, for example, a snap ring, a pin, and the like, and an initial clearance is set between them and the button. The control pedal or lever has its own stop to which it is pressed

I spring. When controlling the brake, the driver must first overcome the set clearance and taprvs will then move the piston and thus the hydraulic fluid in the brake system. In addition, the force of the return spring of the brake pedal or brake lever must be overcome.

These drawbacks are solved by an embodiment of the master cylinder according to the invention, in which, in the basic position, the piston, which is pushed from one side by a spring, bears back against one side of the actuating member with the other side. One of the arms of the actuating member can be provided with an adjusting part and the stop for the actuating member is formed on the body of the master cylinder.

The advantage of this solution is that the return spring of the brake pedal or lever actuator can be removed - since its function is fully replaced by a spring in the pressure part of the cylinder, pushing the piston into its home position. It is also advantageous that in the solution according to the invention there is no initial clearance between the individual components controlling the movement of the piston in the cylinder, and therefore the movement of the number actuating means that the piston is immediately displaced.

An example of a solution according to the invention, represented by a master cylinder for a motorcycle disc brake with manual operation, is shown in the attached drawing.

The master cylinder body 1 also forms a brake fluid reservoir 2. In the cavity 3 of the body 11 there is a piston 4 provided with sealing collars 5 and 6, pushed into the basic position by a spring 7. The piston 4 is supported on the first arm 8 of the actuating member 9, which here represents a hand lever. The second arm 10 of the actuating member 9 abuts against a stop 11 formed as part of the master cylinder body 11. Between the first arm 8 and the felt 4 an adjustment element 12 formed by a screw with a lock nut is inserted. The space of the cavity 3 of the master cylinder body 11 is connected to the brake fluid reservoir 2 via a bleed port 13 and a fill port 14.

The preload of the spring 7 is adjusted by the adjusting member 12 which moves the pin 4 so that in the basic position the overflow port 13 is not overlapped by the sealing collar 5. With the piston 4 operating during braking as soon as the sealing collar 5 passes the overflow port 13 connection port 15 to the brake system.

The solution according to the invention is applicable to various types of master brake cylinders, especially motorcycle disc brakes.

Claims (2)

PATENTOVÉ. CLAIM A master cylinder for actuating hydraulic brakes having a cavity in which a piston is sealed by a collar and is spring-pushed, characterized in that the felt (4) has a stop (11) in the body (1) by means of the arms (8, 10) of the actuator (9). The master cylinder for actuating the hydraulic brakes according to claim 1, characterized in that one of the arms (8, 10) of the actuating member (9) is provided with an adjustment part (12).