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What is a clutch booster?
Exploring the Structural Characteristics of a Clutch Booster
In the hydraulic operation system of a car, the clutch booster plays an important role, and it shares the same compressed air supply system with the pneumatic brake system and other pneumatic devices. This booster is mainly composed of four major components: the pneumatic control valve, the hydraulic cylinder, the drive piston, and the housing.
The design of the pneumatic booster ensures that the driver can perceive and control the clutch's disengagement or engagement status in real time. There is an increasing functional relationship between its output force and the travel of the clutch pedal. It is worth mentioning that even if the pneumatic booster system fails, the driver can still operate the clutch manually.
Operation Mechanism Analysis
When the driver presses the clutch pedal, hydraulic oil is expelled from the clutch master cylinder and flows into the booster through the oil pipe. As the pedal travel progresses, the amount of oil entering the booster increases, leading to a rise in oil pressure. At this time, the hydraulic oil drives the piston and stem diaphragm assembly to move to the right. When the exhaust hole at the end of the stem is closed by the lift valve and the lift valve opens, the compressed air in the air reservoir flows into the left chamber of the power piston through the right chamber of the stem diaphragm assembly. As the opening travel of the lift valve gradually increases, the compressed air pushes the power piston, pushrod, hydraulic piston, and another pushrod to move to the right, thereby driving the clutch release fork to rotate, causing the clutch release bearing to push the lever cushion ring, ultimately achieving clutch disengagement.
When the driver releases the clutch pedal, the oil pressure decreases. Under the action of the pressure plate spring, the push rod, hydraulic piston, another push rod, and power piston are pushed back in the opposite direction. At this time, compressed air moves the stem diaphragm assembly to the left, while the lift valve closes under the action of the return spring. The compressed air in the right chamber of the diaphragm and the left chamber of the power piston flows into the left chamber of the diaphragm through the vent hole in the stem and then is discharged into the atmosphere through the vent plug. Under the action of the push rod, the hydraulic piston returns to its original position, and the hydraulic oil flows back to the clutch master cylinder.
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