CLUTCHES

CLUTCHES

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  CLUTCHE S
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   INTRODUCTION Purpose  Clutch terms  Components  Construction Of Clutches  Clutch Linkage  Types of Clutch  Clutch Safety Switch  Clutch Disk Replacement
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  Clutch •Clutch isa mechanical device that facilitates transmission of power and motion from one component (the driving member) to another (the driven member) when engaged, with a provision for disengagement whenever required. •In the simplest application, clutches connect and disconnect two rotating coaxial shafts. One shaft is attached to a power unit (the driving member) while the other shaft (the driven member) provides output power for work. The motions involved are rotary in nature.
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  Purpose •A clutchis designed with the following requirements –Allow the vehicle to come to a stop while the transmission remains in gear –Allow the driver to smoothly take off from a dead stop –Allow the driver to smoothly change gears –Must be able to transmit power and torque without slipping
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  •Clutch disengaged (Clutchpedal pressed) The clutch is disengaged when –Starting the engine –Shifting the gear –Stopping the vehicle and –Idling the engine •Clutch engaged –Clutch pedal is released
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  Components Primary components Flywheel Clutch disc Pressure plate Release (Throw out) bearing Secondary components Pilot bearing Release fork Slave cylinder
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  8 Coil springpressure plate (cover and pressure plate)
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  9 Bolted toCrank Pilot bushing or bearing in center of flywheel or crankshaft, supports the end of input shaft (friction disk) splined to transmission Input shaft (throw-out bearing T/O bearing) allows to push on rotating clutch fingers Bolted to flywheel - Applies the spring force to clamp the friction disk to the flywheel (clutch fork) pushes T/O bearing to release rotating clutch
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  10 Pivots T/Obearing Moves pressure Plate right Releases friction disk from flywheel
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  Can be verycomplicated • Have the right amount of movement and direction without too much pedal pressure • Wear • Motor mounts • Spring to pull T/O bearing away • Has to be lubricated 11
• 12.
  Types of Clutch 1.WET CLUTCH : Wet clutch is immersed in a cooling lubricating fluid which also keeps the surfaces clean and gives smoother performance and longer life. Wet clutches, however, tend to lose some energy to the liquid. 2.DRY CLUTCH : Dry clutch, as the name implies, is not bathed in fluid and runs dry.
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  No complicated linkage Flexibility No motor mount problems 13
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  The faster theRPM, the harder the clutch disk is squeezed 16
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  Uses master cylinderand slave cylinder Uses brake fluid Must be bleed 17
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  No complicated linkage Can easily control mechanical advantage with piston sizes Self lubricating No motor mount problems 18 Service just like you would hydraulic brakes
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  19 Slave cylinder Some are adjustable for free-play and some not
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  Prevents from crankingwith clutch engaged  Some standard transmissions won’t let you take the key out and lock the steering column with out the transmission in reverse • Prevents steering lock while moving forward 20
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  Very wise to: • Have flywheel surfaced (even with no run-out or hot spots) • Replace pilot bushing or bearing • Replace T/O bearing • Replace pressure plate (cover, plate springs) 21
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  Very wise toinspect & replace as necessary: • Clutch fork & pivot • Input shaft bearing retainer on transmission (where T/O bearing slides) • Linkage, cable or hydraulic components • Motor mounts • Flywheel ring gear 22