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A clutch is a mechanical device that provides for the transmission of power ( and therefore usually motion ) from one component ( the driving member ) to another ( the driven member ) when engaged, but can be disengaged.
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clutch and is
Clutches are used whenever the transmission of power or motion needs to be controlled either in amount or over time ( e. g., electric screwdrivers limit how much torque is transmitted through use of a clutch ; clutches control whether automobiles transmit engine power to the wheels ).
The opposite is true with a push type, the release bearing is pushed into the clutch disengaging the vehicle drive.
A wet clutch is immersed in a cooling lubricating fluid which also keeps the surfaces clean and gives smoother performance and longer life.
A dry clutch, as the name implies, is not bathed in liquid and should be, literally, dry.
A centrifugal clutch is used in some vehicles ( e. g., Mopeds ) and also in other applications where the speed of the engine defines the state of the clutch, for example, in a chainsaw.
In the case of a chainsaw this allows the chain to remain stationary whilst the engine is idling ; once the throttle is pressed and the engine speed rises, the centrifugal clutch engages and the cutting chain moves.
Also known as a slip clutch or safety clutch, this device allows 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.
* Many safety clutches are not friction clutches, but belong to the interference clutch family, of which the dog clutch ( see below ) is the best-known.
The friction material varies in composition depending on many considerations such as whether the clutch is " dry " or " wet ".
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.
Engaging the clutch abruptly when the engine is turning at high speed causes a harsh, jerky start.
This plastic pilot shaft guide tool is used to align the clutch disk as the spring-loaded pressure plate is installed.
In a modern car with a manual transmission the clutch is operated by the left-most pedal using a hydraulic or cable connection from the pedal to the clutch mechanism.
The default state of the clutch is engaged-that is the connection between engine and gearbox is always " on " unless the driver presses the pedal and disengages it.
clutch and mechanical
On older cars the clutch might be operated by a mechanical linkage.
It takes the place of a mechanical clutch, allowing the transmission to stay in gear and the engine to remain running while the vehicle is stationary, without stalling.
Manual transmissions use a mechanical clutch to transmit torque, rather than a torque converter, thus avoiding the primary source of loss in an automatic transmission.
Because this vertical orientation could have resulted in the car dropping out of gear when the lever was in the upper positions ( i. e., second or reverse gears ), the gear shift mechanism was locked when the mechanical clutch was engaged and released when the clutch pedal was depressed.
The torque converter normally takes the place of a mechanical clutch in a vehicle with an automatic transmission, allowing the load to be separated from the power source.
The application of the clutch locks the turbine to the impeller, causing all power transmission to be mechanical, thus eliminating losses associated with fluid drive.
In modern automotive applications, this problem is commonly avoided by use of a lock-up clutch that physically links the impeller and turbine, effectively changing the converter into a purely mechanical coupling.
On synchromesh boxes, friction cones or " synchro-rings " are used in addition to the dog clutch to closely match the rotational speeds of the two sides of the ( declutched ) transmission before making a full mechanical engagement.
Because this torque is transmitted by means of friction rather than direct mechanical contact, considerable power is wasted as heat ( which is dissipated by the clutch ).
In mechanical or automotive engineering, a freewheel or overrunning clutch is a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft.
Geared, torque-sensitive mechanical limited-slip differentials use helical gears or worm gears rather than the beveled spider gears of the clutch based differentials.
Other modifications that were incorporated at this time were a new gearbox, and hydraulic actuation for the clutch ( Series I models used a mechanical clutch linkage ).
The Middle East / African export market version is the same basic car only with minor cosmetic changes and mechanical downgrades to make it cheaper, such as non-power steering, downgraded interior trim, a downgraded braking system, and a mechanical clutch instead of a hydraulic one.
It provides a shift time of just 150 milliseconds, and is mechanical with a 215 millimetre ( 8. 5 in ) twin plate dry clutch.
The clutch in the system was replaced by a powder ferromagnetic coupler, while the transmission itself was a three-speed mechanical unit similar to that of the Dauphine — but from the beginning, in this form, with synchromesh on all gears.
The transmission uses a hydraulic clutch, except for the Cobra which is mechanical and had an 11 inch clutch disk.
The mechanical transmission in the rear part of the hull consists of a change gear quadrant, a multiplate main clutch of metallic contact, a manual gearbox with five forward gears, two multiplate planetary steering clutches with band brakes and two in-line final drive groups.
Both clutch packs are fully disengaged, all gear-sets are disengaged, and a solid mechanical transmission ' lock ' is applied to the crown wheel of the DSG's internal differential.
In 1988 the clutch was converted from a mechanical linkage to a hydraulic system.
Despite its smoothness and improved fuel efficiency there have been numerous reports from owners around the world that the multitronic transmission is prone to electronic glitches and mechanical issues especially for models using clutch pack with six plates built before or around 2006.
clutch and device
* The word clutch ( pronounced: " cloch ") is Spanglish, Mexican Spanish and Latin American Spanish for the gear-shifting device of an automotive transmission.
In each differential, one shaft is connected to the engine ( through a clutch or functionally similar device ), another to the driving wheels ( through another differential as described above ), and the third shaft can be braked so its angular velocity is zero.
Principally, a type of device known as a sprag or roller clutch is used for routine upshifts / downshifts.
A fan clutch is a thermostatic device that exists as an integral component of certain automotive cooling systems.
A device was fitted to the carburettor to prevent the throttle closing abruptly, and the resultant clutch disengagement and lack of engine braking.
Earlier, and by many manufacturers, an arrangement to disengage the clutch ( via a ratchet-like device ) during coasting was tried to ease shifting.
This is prevented with a slipping clutch device.
Although it was described as a form automatic transmission at the time, in retrospect it was more realistically a form of automatic clutch, inspired by the German Saxomat device which appeared as an option on several mainstream German cars in the 1950s and 60s.
In the clutch system, the device which the master cylinder operates is called the slave cylinder ; it moves the throw out bearing until the high-friction material on the transmission's clutch disengages from the engine's metal ( or ceramic / carbon ) flywheel.
A clutch is a mechanical device which provides for the transmission of power from one component to another.
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