汽车设计资料 英文文献

有个关于汽车的英语文献,献出来给大家共享一下!

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 .

有个关于汽车的英语文献,献出来给大家共享一下!

When the clutch is applied , the flywheel transfers engine torque to the clutch disc .

Because of its weight , the flywheel helps to smooth engine operation . The flywheel

also has a large ring gear at its outer edge , which engages with a pinion gear on the

starter motor during engine cranking .

The clutch disc fits between the flywheel and the pressure plate . The clutch disc

has a splined hub that fits over splines on the transmission input shaft . A splined

hub has grooves that match splines on the shaft . These splines fit in the grooves .

Thus , the two parts held together . However , back – and – forth movement of the

disc on the shaft is possible . Attached to the input shaft , the disc turns at the speed of

the shaft .

The clutch pressure plate is generally made of cast iron . It is round and about

the same diameter as the clutch disc . One side of the pressure plate is machined

smooth . This side will press the clutch disc facing are against the flywheel . The outer

side has shapes to facilitate attachment of spring and release mechanism . The two

primary types of pressure plate assemblies are coil spring assembly and diaphragm

spring .

In a coil spring clutch the pressure plate is backed by a number of coil springs

and housed with them in a pressed – steed cover bolted to the flywheel . The spring

push against the cover . Neither the driven plate nor the pressure plate is connected

rigidly to the flywheel and both can move either towards it o away . When the clutch

pedal is depressed a thrust pad riding on a carbon or ball thrust bearing is forced

towards the flywheel . Levers pivoted so that they engage with the thrust pad at one

end and the pressure plate tat the other end pull the pressure plate back against its

springs . This releases pressure on the driven plate disconnecting the gearbox from the

engine .

Diaphragm spring pressure plate assemblies are widely used in most modern

cars . The diaphragm spring is a single thin sheet of metal which yields when pressure

is applied to it . When pressure is removed the metal spring back to its original shape .

The center portion of the diaphragm spring is slit into numerous fingers that act as

release levers . When the clutch assembly rotates with the engine these weights are

flung outwards by centrifugal plate and cause the levers to press against the pressure

plate . During disengagement of the clutch the fingers are moved forward by the

release bearing . The spring pivots over t …… 此处隐藏：35973字，全部文档内容请下载后查看。喜欢就下载吧 ……