Clutch master cylinder
When the driver depresses the clutch pedal, the push rod pushes the master cylinder piston to increase the oil pressure and enters the slave cylinder through the hose, forcing the slave cylinder pull rod to push the release fork and push the release bearing forward; When the driver releases the clutch pedal, the hydraulic pressure is released, the release fork gradually returns to the original position under the action of the return spring, and the clutch is engaged again.
There is a radial long round through hole in the middle of the piston of the clutch master cylinder. The direction limiting screw passes through the long round hole of the piston to prevent the piston from rotating. The oil inlet valve is installed into the axial hole at the left end of the piston, and the oil inlet valve seat is inserted into the piston hole through the straight hole on the piston surface.
When the clutch pedal is not pressed, there is a gap between the master cylinder push rod and the master cylinder piston. Due to the limit of the direction limiting screw on the oil inlet valve, there is a small gap between the oil inlet valve and the piston. In this way, the oil reservoir is connected with the left chamber of the master cylinder through the pipe joint, oil passage and oil inlet valve. When the clutch pedal is pressed, the piston moves to the left, and the oil inlet valve moves to the right relative to the piston under the action of the return spring, eliminating the gap between the oil inlet valve and the piston.
Continue to press the clutch pedal, the oil pressure in the left chamber of the master cylinder increases, and the brake fluid in the left chamber of the master cylinder enters the booster through the oil pipe. The booster works and the clutch is separated.
When the clutch pedal is released, the piston moves rapidly to the right under the action of the same position spring. Due to the certain resistance of the brake fluid flowing in the pipeline, the speed of returning to the master cylinder is slow. Therefore, a certain vacuum degree is formed in the left chamber of the master cylinder, and the oil inlet valve moves to the left under the action of the pressure difference between the left and right oil chambers of the piston, A small amount of brake fluid in the oil reservoir flows into the left chamber of the master cylinder through the oil inlet valve to make up for the vacuum. When the brake fluid originally entering the booster from the master cylinder flows back to the master cylinder, there is excess brake fluid in the left chamber of the master cylinder, and the excess brake fluid will flow back to the oil reservoir through the oil inlet valve.
