Transmission for self-propelled working vehicles

Details Transmission for self-propelled working vehicles Transmission for self-propelled working vehicles

1986-05-20

1987-06-16

Love, John J.

Motor vehicles

Manually actuated controlling devices

With transmission control

74701, 74371, 192 4A, 192109F, 180 701, B60R 1700

Patent

active

046730559

ABSTRACT:
In a self-propelled working vehicle having a speed change mechanism wherein a plurality of change gears journaled on a shaft are coupled one at a time by key means disposed within and shiftable along the shaft, fluid-actuated clutch is provided for interrupting input of power to the speed change mechanism before shifting operations. For protecting gear-engaging clutch portion of the key means for damage, fluid pressure applied to the clutch from a disengaged condition thereof is increased gradually by a relief valve including a pressure-modulating control piston. For disengaging the clutch before shifting operations, an unloader valve is provided which is actuated by moving a speed change lever along a direction other than the key-shifting direction.
Relief valve means also acting as an unloader valve for disengaging the clutch is disclosed. Differential-locking clutch is also disclosed which is operated by fluid for actuating the clutch in the transmission path.

REFERENCES:
patent: 3250341 (1966-05-01), Takahashi
patent: 3812735 (1974-05-01), von Kaler et al.
patent: 4031977 (1977-06-01), Grosseau
patent: 4103566 (1978-08-01), von Kaler et al.
patent: 4148382 (1979-04-01), Yamaoka et al.

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