Transmission System and Clutch Assembly

Vocabulary flashcards covering the components, functions, and requirements of vehicle transmission systems, clutch assemblies, and gearboxes based on automotive lecture notes.

Transmission System

A system in motor vehicles that supplies the output of the internal combustion engine to the drive wheels, reducing higher engine speed to slower wheel speed and increasing torque.

Components of a Transmission System

The three primary assemblies of the transmission system: the clutch assembly, gear box assembly (transmission case assembly), and propeller shaft.

Clutch

A mechanism with coincident driving and driven shaft axes that enables the rotary motion of one shaft to be transmitted to another when desired.

Functions of a Clutch

To allow the engine to take up load gradually without shock or jerk, and to disconnect engine power from the gear box during engine starting, gear changes, initial vehicle launch, and braking to a stop.

Dynamic Balancing (Clutch Requirement)

A condition required of the clutch to eliminate operational vibration, particularly necessary in high-speed engine clutches.

Vibration Damping (Clutch Requirement)

A mechanism within the clutch designed to damp vibrations and eliminate noise produced during power transmission.

Free Pedal Play

The clearance in clutch pedal movement that reduces the effective load on the carbon thrust bearing and prevents excessive wear.

Light Weight of Driven Member (Clutch Requirement)

A design specification ensuring that the driven disc does not continue to rotate for any length of time after the clutch has been disengaged.

Driving Members (Clutch)

Clutch parts that rotate continuously with the crankshaft, comprising the flywheel, clutch cover, pressure plate (driving disc), pressure springs, and releasing levers.

Driven Members (Clutch)

The clutch plate carrying friction material on both surfaces, mounted to slide lengthwise on the splines of the clutch shaft (primary shaft) when clamped between the flywheel and pressure plate.

Operating Members (Clutch)

The group of clutch components that controls engagement and disengagement, consisting of the foot pedal, linkage, release bearing, release levers, and springs.

Gear Box (Transmission Case) Assembly

A mechanism providing variable gear ratios to alter the leverage or torque ratio between the engine and the road wheels for different vehicle speeds.

Neutral Position

A condition provided by the transmission where the engine and road wheels remain disconnected even when the clutch is fully engaged.

Reverse Gear

A gear setting within the gear box that provides the means to move the vehicle backwards.