Gear mechanism

Details Gear mechanism Gear mechanism

F - Mech Eng,Light,Heat,Weapons

16

H

74/178

F16H 57/12 (2006.01)

Patent

CA 1322113

ABSTRACT A torque limiting mechanism has two locking members designed to be incapable of transmitting drive between them but having meshing spiral teeth. The members are in a rotatable frame and are respectively driven by radially toothed gears having an idler gear between them. One radially toothed gear is splined to a section of a drive shaft of reduced diameter so that it twists in torsion when an input driving torque is applied to the shaft. Gear lash exists between the radially toothed gears which is overcome by the twist of the shaft if the applied torque is big enough. When this occurs, synchronous drive from the input shaft is applied to both locking members so that they rotate together. The applied torque necessary to achieve this is determined by the position of one gear on the spline and this is controlled by a lever. Until the applied torque overcomes the gear lash, the locking member prevents the locking member from rotating, and the applied torque on the shaft causes the frame to rotate about the axis of the shaft and provide rotational drive to an output shaft. The use of similarly operating locking members is described in other applications than torque limiters.

615095

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