E - Fixed Constructions – 02 – F
Patent
E - Fixed Constructions
02
F
74/213
E02F 9/20 (2006.01) E02F 3/76 (2006.01) E02F 3/80 (2006.01) F16H 1/16 (2006.01)
Patent
CA 1048300
MOTOR GRADER CIRCLE DRIVE A B S T R A C T A motor grader circle drive has an internal spur gear secured to the circle, and the internal gear is driven by one or two barrel worm gears, each of which in turn is driven from a hydraulic motor by an input worm and an input spiral gear keyed to the barrel worm gear, each barrel worm gear is journalled on a spindle in a support and is free to move endwise between a pair of radial flanges while being centered by a pair of belleville spring washers so as to compensate for backlash in each barrel worm gear and to per- mit substantially even distribution of driving force be- tween the barrel worm gears when two are used. This struc- ture operates at very low tooth pressures so as to permit the barrel worm gear to be made of a relatively soft material such as heat treated aluminum. The support, worm gear and input gears are made as a prefabricated sub-assembly, which is easily installed or removed; and using a soft material which wears much faster than the internal gear protects the latter from wear.
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