Clutches

Clutch Construction and Operation This presentation will explore: Clutch Components and Construction Basic Clutch Operation Clutch Operating Mechanisms

Reason For Clutches Used with manual transmission systems. Provide link between engine and transmission system. Allow smooth take up of drive. Next >

Reason For Clutches Clutch allows for brief separation between engine and gearbox. Provides temporary disconnection when vehicle stopped in gear. Next >

Clutch Action Clutch action can be demonstrated by two discs . Drive disc Engine Clutch action can be demonstrated by two discs . Driven disc Input shaft to transmission Drive disc attached to engine. Driven disc attached to transmission input shaft. Driven disc disconnected, no drive. Driven disc in contact with drive disc, drive applied. Next >

Pressure plate assembly Clutch System Parts Clutch system consists of: Clutch plate Flywheel. Release bearing Clutch Plate (driven plate). Clutch housing Pressure Plate Assembly. Release Bearing. Flywheel Clutch Fork. Pressure plate assembly Clutch fork . Next >

Clutch System Parts - Clutch Plate - 1 Located between flywheel and pressure plate. Rivets Friction material Splined hub Splines mesh with input shaft. Frictional material riveted to cushion springs on either side of friction ring. Next >

Clutch System Parts - Pressure Assembly - 1 Used to push clutch plate onto flywheel. Two types of pressure plate: Coil Spring and Diaphragm Spring. Pressure plate Assembly comprises: Cover Diaphragm/coil spring. Pressure plate. Cover. Diaphragm spring Next >

Clutch System Parts - Pressure Assembly - 2 Cover Diaphragm spring pressure plate assembly uses dish-shaped spring. Diaphragm spring As spring is pushed toward engine, clutch plate released. Pressure plate Pivot rings As spring is released, pressure returned to clutch plate. Next >

Clutch System Parts - Release Bearing & Clutch Fork Release bearing and clutch fork move pressure plate. As clutch fork moves, it pushes release bearing and disengages pressure plate from clutch plate. As clutch fork moves in the other direction, release bearing engages clutch plate. Next >

Basic Clutch Operation - 1 A foot pedal operates clutch fork via a link. Releasing foot pedal engages clutch. Pedal action should be smooth to prevent judder. Next >

Basic Clutch Operation - 2 Clutch pedal must be be easy to operate, so levers (or hydraulics) are used to increase effort. Force at cable: 100N x 3 = 300N 1 4 3 Pressure of 100 Newtons (22.5 lb) applied to foot pedal. Multiplied by the pivot ratio of (3:1) on the pedal to a force of 300 Newtons (67.5 lb) on the cable. Force at release bearing: 300N x 4 = 1200N 100N at pedal Multiplied by the pivot ratio on the clutch fork of (4:1) to a force of 1200 Newtons (270 lb) at the release bearing. Next >

Clutch Operating Mechanisms - Mechanical . Outer sheath Wire cable Return spring Next >

Clutch Operating Mechanisms - Hydraulic Master cylinder Slave cylinder Pipe connected between foot pedal and clutch fork. Two cylinders: master cylinder and slave cylinder. Pipe As foot pedal depressed, master cylinder builds pressure in system, slave cylinder activated. As foot pedal released, springs return system to rest position. Next >

Summary You should now be aware of: Clutch Components and Construction Basic Clutch Operation Clutch Operating Mechanisms End >