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What are Clutch Arms?
A clutch arm device is mounted on a clutch using to operate piston valves on a crane or other heavy machine. The piston valves may be operated using a valve arm which has two operative positions and a neutral position between the two operative positions. A clutch arm of the clutch is linked to valve arm to allow the valve arm to be manipulated by a remote control coupled to the clutch. As parts of the linkage between the clutch arm and the valve arm wear, the centering device biases the clutch arm to a central position which corresponds to the neutral position of the valve arm, thereby avoiding problems of under stroking and over stroking which arise in the prior art.
A Clutch Arm mounted on a Centrifugal Clutch
A Clutch Arm mounted on a centrifugal clutch is a clutch that operates automatically via rotational motion rather than longitudinal. In an automobile clutch with a manual transmission, the clutch is deactivated with a foot pedal which in turns pushes on a fulcrum, which retracts the pressure plate, causing the engine and transmission to separate from power, and the driver be able to change gears.
A Clutch Arm mounted on a centrifugal clutch works through centrifugal force. The input of the clutch is connected to the engine crankshaft while the output may drive a shaft, chain, or belt. As engine RPM increases, weighted arms in the clutch swing outward and force the clutch to engage. The most common types have friction pads or shoes radially mounted that engage the inside of the rim of a housing. On the center shaft there are an assorted amount of extension springs, which connect to a clutch shoe. When the center shaft spins fast enough, the springs extend causing the clutch shoes to engage the friction face. It can be compared to a drum brake in reverse. This type can be found on most home built karts, lawn and garden equipment, fuel powered model cars and low power chainsaws. Another type used in racing karts has friction and clutch disks stacked together like a motorcycle clutch. The weighted arms force these disks together and engage the clutch.
When the engine reaches a certain RPM, the clutch activates, working almost like a continuously variable transmission. As the load increases the rpm drops, disengaging the clutch, letting the rpm rise again and reengaging the clutch. If tuned properly, the clutch will tend to keep the engine at or near the torque peak of the engine. This results in a fair bit of waste heat, but over a broad range of speeds it is much more useful than a direct drive in many applications.
Clutch Arm mounted on a Centrifugal clutches are often used in mopeds, under bones, lawnmowers, battle bots, go-karts, chainsaws, and mini bikes to:
• keep the internal combustion engine from stalling when the blade or weapon is stopped abruptly
• provide low load during starting
• allow engine to idle
Thomas Fogarty, who also invented the balloon catheter, is most often credited with first inventing the Clutch Arm mounted on a centrifugal clutch in the 1940's, although automobiles were being manufactured with Clutch Arms mounted on a centrifugal clutches as early as 1936 (Dr Fogarty was born in 1934).
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