Machine element or mechanism – Gearing – Yieldability in gear trains
Patent
1989-09-29
1991-08-27
Diehl, Dwight
Machine element or mechanism
Gearing
Yieldability in gear trains
74425, F16H 5712
Patent
active
050423150
ABSTRACT:
A torque limiting mechanism has two locking members (1 31, 137) designed to be incapable of transmitting drive between them but having meshing spiral teeth (132, 138). The members are in a rotatable frame (127) and are respectively driven by radially toothed gears (128, 124) having an idler gear (125) between them. One radially toothed gear (124) is splined (at 123) to a section of a drive shaft (110) of reduced diameter so that it twists in torsion when an input driving torque is applied to the shaft (110). Gear lash exists between the radially toothed gears (124, 125 and 128) which is overcome by the twist of the shaft (110) if the applied torque is big enough. When this occurs, synchronous drive from the input shaft (110) is applied to both locking members (131, 137) so that they rotate together. The applied torque necessary to achieve this is determined by the position of one gear (124) on the spline (123) and this is controlled by a lever (114). Until the applied torque overcomes the gear lash, the locking member (131) prevents the locking member (137) from rotating, and the applied torque on the shaft (110) causes the frame (127) to rotate about the axis of the shaft (110) and provide rotational drive to an output shaft (112). The use of similarly operating locking members is described in other applications than torque limiters.
REFERENCES:
patent: 2928288 (1960-03-01), Bliss et al.
patent: 3208298 (1965-09-01), Pickles
patent: 3213548 (1965-10-01), Deaton
patent: 3543064 (1970-11-01), Holper
patent: 4443209 (1984-04-01), Hooker et al.
Fahy Arthur J.
Gillies Neil
Diehl Dwight
IVG Australia Pty. Ltd.
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