Hydraulic control system in an automatic transmission for a vehi

Details Hydraulic control system in an automatic transmission for a vehi Hydraulic control system in an automatic transmission for a vehi

1986-05-21

1987-12-01

Braun, Leslie

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74752C, B60K 4124

Patent

active

047095970

ABSTRACT:
A hydraulic control system of an automatic transmission for a vehicle, wherein, in order to achieve an up shift from a specific gear stage to another gear stage in a drive range, there are provided a frictionally engaging device for the normal engagement arranged in series with a one-way clutch and a frictionally engaging device for coasting during engine braking action arranged in parallel to said frictionally engaging device for normal engagement. Hydraulic oil pressure of the frictionally engaging device for normal engagement is controlled in response to a rise or fall in hydraulic oil pressure of the frictionally engaging device for the coasting mode. Thus, combined use of the frictionally engaging device for the coasting mode makes it possible to improve the durability of the frictionally engaging device for normal engagement and decrease the occurrence of shocks generated during shifting operation.

REFERENCES:
patent: 3951011 (1976-04-01), Lemon
patent: 4148232 (1979-04-01), Moriya
patent: 4274307 (1981-06-01), Iwanaga et al.
patent: 4291596 (1981-09-01), Sakakibara
patent: 4467675 (1984-08-01), Sugano et al.
patent: 4519273 (1985-05-01), Shimizu
patent: 4541308 (1985-09-01), Person et al.

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