汽车设计资料 英文文献

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Chassis

Chassis include the clutch , the transmission, the drive shaft, the final drive

assembly, the front suspension, the rear suspension, the steering system ,the brake

system, the wheels and tires.

1.clutch

The engine produces the power to drive the vehicle . The drive line or drive train

transfer the power of the engine to the wheels . The drive train consists of the parts

from the back of the flywheel to the wheels . These parts include the clutch , the

transmission ,the drive shaft ,and the final drive assembly .

The clutch which includes the flywheel ,clutch disc , pressure plate , springs ,

pressure plate cover and the linkage necessary to operate the clutch is a rotating

mechanism between the engine and the transmission . It operates through friction

which comes from contact between the parts . That is the reason why the clutch is

called a friction mechanism . After engagement, the clutch must continue to transmit

all engine torque to transmission depending on the friction without slippage . The

clutch is also used to disengage the engine from the drive train whenever the gears in

the transmission are being shifted from gear ratio to another .

To start the engine or shift the gears , the driver has to depress the clutch pedal

with the purpose of disengagement the transmission from the engine . At that time ,

the driven members connected to the transmission input shaft are either stationary or

rotating at a speed that is slower of faster than the driving members connected to

engine crankshaft . There is no spring pressure on the clutch assembly parts . So there

is no friction between the driving members and driven members . As the driver lets

loose the clutch pedal , spring pressure increase on the clutch parts . Friction between

the parts also increases . The pressure exerted by the springs on the driven members is

controlled by the driver through the clutch pedal and linkage . The positive

engagement of the driving and driven members is made possible the friction between

the surfaces of the members . When full spring pressure is applied , the speed of the

driving and driven members should be the same . At the moment , the clutch must act

as a coupling device and transmit all engine power to the transmission , without

slipping .

However , the transmission should be engaged to the engine gradually in order to

operate the car smoothly and minimize torsional shock on the drive train because an

engine at idle just develop little power . Otherwise , the driving members are

connected with the driven members too quickly and the engine would be stalled .

The flywheel is a major part of the clutch . The flywheel mounts to the engine s

crankshaft and transmits engine torque to the clutch assembly . The flywheel , when

coupled with the clutch disc and pressure plate makes and breaks the flow of power

the engine to the transmission .

The flywheel provides a mounting location for the clutch assembly as well .

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