Hydraulic control device for an automatic transmission

Details Hydraulic control device for an automatic transmission Hydraulic control device for an automatic transmission

1989-09-14

1991-12-24

Diehl, Dwight

Machine element or mechanism

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

Preselected indexed position

74866, B60K 4106

Patent

active

050741683

ABSTRACT:
A reverse-engaging condition is prevented by a reverse inhibit valve operated by the solenoid valve even if a shift lever is operated to a reverse range at forward running. A solenoid valve controlling a 1-2 shift valve is "OFF" when controlling a manual valve to a reverse range under 7 km/h of a vehical speed. The reverse inhibit valve is at a right-half position. Therefore, the hydraulic pressure from the reverse range port of the manual valve runs through oil passages and supplied to the hydraulic servos. At forward running over 7 km/h the solenoid valve is switched "ON", the reverse inhibit valve is switched to a left-half position and oil passages are isolated. When the solenoid valve is switched at forward running, a hydraulic pressure from a R range port of the manual valve does not operate on a difference of cross sectional areas of lands of the reverse inhibit valve, so that the reverse inhibit valve is kept at the right-half position together with a pressing force of a spring therein.

REFERENCES:
patent: 3937107 (1976-02-01), Lentz
patent: 4033203 (1977-07-01), Hirosawa et al.
patent: 4134313 (1979-01-01), Ishikawa
patent: 4136584 (1974-01-01), Ishikawa
patent: 4307631 (1981-12-01), Iwanaga et al.
patent: 4488457 (1984-12-01), Nishimura et al.
patent: 4744269 (1988-05-01), Greene et al.
patent: 4792901 (1988-12-01), Mack et al.
patent: 4827807 (1989-05-01), Hayakawa et al.
patent: 4920829 (1990-05-01), Takada et al.

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