Fluid circuit for shifting a transmission

Machine element or mechanism – Gearing – Plural power paths to and/or from gearing

Patent

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Details

91413, 13750514, 13762568, 192 4A, F16H 374, F16H 5710

Patent

active

039981118

ABSTRACT:
A hydraulic system responsive to movement of a shift lever energizes selected pairs of drive engaging devices in a vehicle transmission by applying a gradual rise in pressure to the selected speed drive engaging device and by applying a delayed and a lesser gradual pressure rise to a selected directional drive engaging device. The circuit neutralizes the transmission by blocking fluid pressure from at least one of the devices if the vehicle engine is started with the shift lever at a position other than neutral and also neutralizes the transmission when the vehicle brakes are applied while still maintaining full fluid pressure to other vehicle components. These functions are accomplished by a combination of a pair of selector valves, a pressure modulation valve assembly and a greatly simplified and compact spool differential check and safety valve.

REFERENCES:
patent: 2919603 (1960-01-01), Livemore
patent: 3091976 (1963-06-01), Johnson
patent: 3181394 (1965-05-01), Ramsel
patent: 3198027 (1965-08-01), Ramsel
patent: 3217726 (1965-11-01), Rohweder
patent: 3386540 (1968-06-01), Horsch
patent: 3444762 (1969-05-01), Golan
patent: 3468194 (1969-09-01), Horsch
patent: 3481435 (1969-12-01), Pearce
patent: 3583422 (1971-06-01), Dach
patent: 3596536 (1971-08-01), Starling
patent: 3625322 (1971-12-01), Nagamatsu
patent: 3709065 (1973-01-01), Starling
patent: 3729171 (1973-04-01), Yates

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