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Centrifugal clutches were used in railway locomotives before 1858, [1] and referred to (in relation to electric motors) in a patent of 1899. [2] A patent was issued in the United States for an automotive centrifugal clutch (on an electric vehicle) in 1898. [3] There is a design for a toy 'automatic clutch' in Meccano Magazine of June 1934. [4]
The Saxomat consisted of two independent systems: the centrifugal clutch, and the servo clutch. The centrifugal clutch was engaged above a certain engine speed by centrifugal force acting on spinning weights inside the clutch, similar to a centrifugal governor. The servo clutch used an electric switch that supplied manifold vacuum via an ...
The best-known is the fluid flywheel, used for touring cars such as the Daimler (Armstrong Siddeley used a centrifugal clutch). [2] Sports cars used a Newton centrifugal clutch. [2] This was a multiple plate dry clutch, similar to racing manual clutches of the time, but with the pressure plate centrifugally actuated to engage at around 600rpm. [17]
The sprag clutch simply "lets go" once the reaction force it provides is no longer needed. In a Simpson planetary gearset, common to many automatic transmissions, this happens on the 1-2 shift, and reverses on the 2-1 downshift. The 2-3 shift is done by engaging a single clutch, and nothing is released.
The 1941 Chrysler M4 Vacamatic transmission was a two-speed manual transmission with an integral underdrive unit, a traditional manual clutch, and a fluid coupling between the engine and the clutch. [ 51 ] [ 52 ] [ 53 ] The two-speed transmission had "high" and "low" ranges, and the clutch was used when the driver wanted to switch between ranges.
By disengaging the clutch, the engine speed (RPM) is no longer determined by the speed of the driven wheels. Another example of clutch usage is in electric drills. [2] The clutch's input shaft is driven by a motor and the output shaft is connected to the drill bit (via several intermediate components). The clutch allows the drill bit to either ...
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