Clutch 4
Clutch 4 : A device used to connect or disconnect (engage or disengage) two rotatable parts so they revolve as one unit or separately, as required. Generally one of two types: (1) Friction clutch: A clutch which relies on friction to transmit movement from one part to another: thus it may be partially engaged if required to transmit only some of the available torque (rotary force), or engaged progressively to provide smooth engagement as in the clutch of a car. (2) Positive clutch: A clutch in which the movement is transmitted between the members by a positive mechanical action. It is either fully engaged or fully disengaged and cannot be ,slipped, or engaged smoothly like a friction clutch
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