US 4,358,088 AGranted

Winch drive and braking mechanism

AssigneePACCAR of Canada Ltd.

InventorsLawrence A. House, Vladimir Kumpa, John E. Magnuson

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Abstract

A drive train for a winch from a continuously rotating input source to an intermittently rotated drum in which the drive train is through a clutch, then to a shaft, then through a continuously driven internal brake which forms a part of the drive train from the shaft, then to the drive train to the drum, with the shaft being provided with a one-way clutch so that the brake automatically is engaged for lowering the load by reversing the drum. A free-spool circuit is provided which can be operated only in the brake release position for safety and is operated off the brake release hydraulic control fluid pressure. A static or manual pump control fluid circuit is provided for operating the clutch, brake and/or free spool. A combination driving clutch and drag clutch are energized by opposite directional movement of a single piston for coupling an input to an output or stopping movement of the output.

Claims11

Dependent claims

A winch having a drum, means for driving the drum, said drive means having a controllable clutch and a brake, the improvement comprising:

a drive train connecting a power supply to the drum, said drive train including
a rotatable drive shaft,
a controllable clutch on one end of said drive shaft for selectively rotating said drive shaft in a hoist direction,
an automatic one-way clutch on said drive shaft for allowing rotation of said drive shaft in said hoist direction but locking the drive shaft against movement in the opposite lowering direction,
a controllable brake on said rotatable drive shaft coupling the drive shaft to the drive train downstream of the drive shaft and wherein said brake is an integral driving part of the drive train during hoisting of a load, and
control means for selectively, alternately (1) actuating the controllable clutch to rotate the drive shaft for hoisting a load using the brake or (2) releasing the brake for releasably allowing restricted movement of the drive train downstream of the drive shaft relative to the drive shaft with the drive shaft locked by the one-way clutch for lowering a load.

3 more elements

Dependencies are inferred from the claim text.