Some trucks, especially the clutches of heavy-duty trucks, have a relatively large clutch pressure. To reduce the driver's effort to step on and off the pedals, clutch boosters are often used. They are also known as clutch booster cylinders and booster pumps. These devices use cylinders and cylinders at the same time. The Card Friends Association believes that this is similar to the principle of gas-capped oil braking. In fact, the principles of the two mechanisms are quite different. (Learn more about gas top oil brakes: read the old driver's gas top oil in three minutes)
The clutch mechanism uses the brake fluid as the medium, starts from the clutch pedal, and finally transmits the force to the clutch shift fork, acting on the release bearing, and pressing the pressure plate diaphragm to separate the pressure plate and the clutch plate to interrupt the transmission.
General helpless hydraulic clutch mechanism:
Pedal - Clutch Master (Hydraulic) - Tubing - Clutch Clutch (Hydraulic) - Clutch Fork
Clutch mechanism with clutch power cylinder:
Pedal - Clutch master cylinder (hydraulic) - Tubing - Clutch cylinder (gas-liquid one) - clutch shift fork
It can be seen that the clutch booster cylinder replaces the original clutch clutch pump, and the two play the same role. The clutch shift fork is also controlled by the push rod, but the cylinder is introduced into the booster cylinder and the pressure is used to generate the clutch cylinder. Help.
In terms of structural principles, the clutch booster cylinder is similar to the gas-liquid booster cylinder used in industrial manufacturing. It is also an integral structure of the cylinder and the cylinder. The hydraulic oil and the compressed air are isolated, and the compressed air is used to achieve the assisting function.
Depressing the clutch pedal and clutching the brake fluid output of the master cylinder to reach the oil chamber of the booster cylinder, the hydraulic fluid has two directions. One is to push the master cylinder piston connecting the push rod, and the other is to promote the relay piston to make the cylinder. When the valve opens, the compressed air in the air tank flows into the air chamber of the booster cylinder. At this time, the push rod is pushed out under the action of the air pressure and the hydraulic pressure.
When the clutch pedal is released, the oil pressure drops. Under the action of the spring force of the clutch pressure plate, the push rod moves back and the relay piston also returns to the closed position to close the air intake channel. At this time, there is a gap between the valve assembly and the relay piston. Exhaust gaps, compressed air exits the atmosphere, and the push rod returns to its original position.
Unlike the vacuum booster pump, the help of the clutch booster pump is more direct. In addition, some cardmates who want to open a light truck want to install a clutch booster pump. There are two issues that need to be addressed. First, there must be a gas storage tank (air braking type) and the second is to have enough space for installation. There are clutch power assist pumps with bore sizes ranging from 70mm to 120mm on the market. Light trucks generally use small bores.
● Postscript:
Some people may say that it is not better to use air pressure directly on the clutch? However, from the use of a pneumatic brake, the controllability of the air pressure can be felt to be not very good, and the clutch needs a semi-linkage control, so it is not realistic to use pure air pressure. To sum up, the gas top oil brake is a mechanism that performs hydraulic braking by connecting the air chamber and the hydraulic cylinder in series. The clutch power assist cylinder is an integrated component that uses air pressure to assist. It seems that the clutch assistance can not be called Gas top oil.
