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Encyclopedia > Clutch
Flywheel (100x100)
Flywheel
Clutch for a drive shaft: The clutch disc (center) spins with the flywheel (left). To disengage, the lever is pulled (black arrow), causing a white pressure plate (right) to disengage the green clutch disc from turning the drive shaft, which turns within the thrust-bearing ring of the lever. At rest, all 3 rings connect, with no gaps.
Rear side of a Ford V6 engine, looking at the clutch housing on the flywheel
Rear side of a Ford V6 engine, looking at the clutch housing on the flywheel
Single, dry, clutch friction disc. The splined hub is attached to the disc with springs to damp chatter.
Single, dry, clutch friction disc. The splined hub is attached to the disc with springs to damp chatter.

A clutch is a mechanism for transmitting rotation, which can be engaged and disengaged. Clutches are useful in devices that have two rotating shafts. In these devices, one shaft is typically driven by a motor or pulley, and the other shaft drives another device. In a drill, for instance, one shaft is driven by a motor, and the other drives a drill chuck. The clutch connects the two shafts so that they can either be locked together and spin at the same speed, or be decoupled and spin at different speeds. Look up clutch on Wiktionary, the free dictionary. ... Image File history File links Clutch_explosion. ... Image File history File links Red_pog2. ... Download high resolution version (640x853, 120 KB)Ford Cologne V6 engine from the rear (flywheel) side. ... Download high resolution version (640x853, 120 KB)Ford Cologne V6 engine from the rear (flywheel) side. ... Image File history File links Clutchdisc. ... Image File history File links Clutchdisc. ... A spline consists of a long strip of wood (a lath, not to be confused with lathe) fixed in position at a number of points. ... Engage is an alternative launcher for the Enlightenment DR17 made with the Enlightenment foundation libraries. ... For other uses, see Drill (disambiguation). ...

Contents

Vehicle clutches

There are many different vehicle clutch designs but most are based on one or more friction discs, pressed tightly together or against a flywheel using springs. The friction material varies in composition depending on whether the clutch is dry or wet, and on other considerations. Friction discs once contained asbestos, but this has been largely eliminated. Clutches found in heavy duty applications such as trucks and competition cars use ceramic clutches that have a greatly increased friction coefficient, however these have a "grabby" action and are unsuitable for road cars. The spring pressure is released when the clutch pedal is depressed thus either pushing or pulling the diaphragm of the pressure plate, depending on type, and the friction plate is released and allowed to rotate freely. For other uses, see Friction (disambiguation). ... Spoked flywheel Flywheel from stationary engine. ... Helical or coil springs designed for tension A spring is a flexible elastic object used to store mechanical energy. ... For other uses, see Asbestos (disambiguation). ... This article is about pressure in the physical sciences. ...


When engaging the clutch, the engine speed may need to be increased from idle, using the manual throttle, so that the engine does not stall (although in most cars, especially diesels, there is enough power at idling speed that the car can move. This requires fine control of the clutch). However, raising the engine speed too high while engaging the clutch will cause excessive clutch plate wear. Engaging the clutch abruptly when the engine is turning at high speed causes a harsh, jerky start. This kind of start is desired in drag racing and other competitions, however. In an engine, the throttle is the mechanism by which the engines power is increased or decreased. ... Drag racing is a sport in which cars race down a track with a set distance as fast as possible. ...


Wet and dry clutches

A '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. A 'dry clutch', as the name implies, is not bathed in fluid. Since the surfaces of a wet clutch can be slippery (as with a motorcycle clutch bathed in engine oil), stacking multiple clutch disks can compensate for slippage. A lubricant (colloquially, lube) is a substance introduced between two moving surfaces to reduce the friction and wear between them. ...


Clutch operation in automobiles

In a car the clutch is operated by the left-most pedal using hydraulics or a cable connection from the pedal to the clutch mechanism. Even though the clutch may physically be located very close to the pedal, such remote means of actuation are necessary to eliminate the effect of slight engine movement, engine mountings being flexible by design. With a rigid mechanical linkage, smooth engagement would be near-impossible, because engine movement inevitably occurs as the drive is "taken up". No pressure on the pedal means that the clutch plates are engaged (driving), while depressing the pedal disengages the clutch plates, allowing the driver to shift gears or coast. “Car” and “Cars” redirect here. ... Note: This page needs to be cleaned up to be brought into conformance with the Manual of Style. ... Table of Hydraulics and Hydrostatics, from the 1728 Cyclopaedia. ... 6 or 15cm outside diameter, oil-cooled cables, traversing the Grand Coulee Dam throughout. ... Spur gears found on a piece of farm equipment A gear is a wheel with teeth around its circumference, the purpose of the teeth being to mesh with similar teeth on another mechanical device -- possibly another gear wheel -- so that force can be transmitted between the two devices in a...


A manual transmission contains cogs for selecting gears. These cogs have matching teeth, called dog teeth, which means that the rotation speeds of the two parts have to match for engagement. This speed matching is achieved by a secondary clutch called a synchronizer, a device that uses frictional contact to bring the two parts to the same speed, and a locking mechanism called a blocker ring to prevent engagement of the teeth (full movement of the shift lever into gear) until the speeds are synchronized. A manual transmission (also known as a stick shift, straight drive, or standard transmission) is a type of transmission used in automotive applications. ...


Non-powertrain clutches in automobiles

There are other clutches found in a car. For example, a belt-driven engine cooling fan may have a clutch that is heat-activated. The driving and driven elements are separated by a silicone-based fluid. When the temperature is low, the fluid is thin and so the clutch slips. When the temperature is high, the fluid thickens, causing the fan to spin. There are also electronically engaged clutches (such as for an Air conditioning compressor) that use magnetic force to lock the pulley and compressor together. Note: in the broadest sense, air conditioning can refer to any form of heating, ventilation, and air-conditioning. ...


Clutch operation in motorcycles

On most motorcycles, the clutch is operated by the clutch lever, located on the left handlebar. No pressure on the lever means that the clutch plates are engaged (driving), while pulling the lever back towards the rider will disengage the clutch plates, allowing the rider to shift gears. Motorcycle clutches are usually made up of a stack of alternating plain steel and friction plates. One type of plate has lugs on its inner diameter that key it to the engine crankshaft, while the other type of plate has lugs on its outer diameter that key it to a basket that turns the transmission input shaft. The plates are forced together by a set of coil springs when the clutch is engaged. Racing motorcycles often use slipper clutches to eliminate the effects of engine braking. For other uses, see Motorcycle (disambiguation). ... Slipper clutches are specialized clutches developed for racing motorcycles to eliminate the effects of engine braking when riders would decelerate as they entered corners. ... It has been suggested that Exhaust brake be merged into this article or section. ...


Centrifugal clutches

Some cars and mopeds have a centrifugal clutch, using centrifugal effects to engage the clutch above certain rpm, see Saxomat. Mopeds are a class of low-powered motorized vehicles, generally two-wheeled. ... There are very few or no other articles that link to this one. ... The expression centrifugal force is used to express that if an object is being swung around on a string the object seems to be pulling on the string. ... For other uses, see Revolutions per minute (disambiguation). ... Saxomat was a type of automatic clutch available as an option on Saab 93, Volkswagen Beetle, Borgward, DKW, BMW, Opel, NSU and Glas. ...


Other clutches

  • Dog clutches
  • Cone clutches
  • Safety clutches: These devices allow a rotating shaft to "slip" when higher than normal resistance is encountered on a machine. An example of a safety clutch is the one mounted on the driving shaft of a large grass mower. The clutch will "slip" or "give" if the blades hit a rock, stump, or other immobile object.
  • Overrunning clutch or freewheel
  • Single plate & Multi-plate friction clutches
    • Single plate: This type of clutch is used almost exclusively in vehicles and has three main parts:
      • (i) Driving members
      • (ii) Driven members
      • (iii)operating members
  • Centrifugal clutch and semi-centrifugal clutch
  • Hydraulic clutch
  • Electromagnetic clutch

Dog clutch used to drive the platter in a microwave oven. ... A cone clutch serves the same purpose as a disk or plate clutch. ... The clutch plate is lined with a friction material with the output shaft running through the center. ... There are very few or no other articles that link to this one. ... A fluid coupling is a hydraulic device used for trasmitting mechanical shaft power from a rotating driver to a rotating driven load. ... An Electromagnetic clutch is a clutch (a mechanism for transmitting rotation) which can be engaged and disengaged by an electromagnet: it operates via an electric actuation, but transmits torque mechanically. ...

See also

Clutch is a musical group from Germantown, Maryland in the United States. ... In a vehicle with a manual transmission, riding the clutch refers to the practice of keeping the clutch partially disengaged when not required. ...

External links

  • HowStuffWorks has a detailed explanation of the working of a clutch.
Wikimedia Commons has media related to:
Category:Couplings

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Clutch - Wikipedia, the free encyclopedia (833 words)
The spring pressure is released when the clutch pedal is depressed thus either pushing or pulling the diaphragm of the pressure plate, depending on type, and the friction plate is released and allowed to rotate freely.
This speed matching is achieved by a secondary clutch called a synchromesh, a device that uses frictional contact to bring the two parts to the same speed, and a locking mechanism called a blocker ring to prevent engagement of the teeth (full movement of the shift lever into gear) until the speeds are synchronized.
While engaging the clutch, the engine speed may need to be increased from idle, using the manual throttle, so that the engine does not stall (although in most cars, especially diesels, there is enough power at idling speed that the car can move although fine movements with the clutch are needed).
  More results at FactBites »

 
 

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