Shift timing control for automatic transmission

Details Shift timing control for automatic transmission Shift timing control for automatic transmission

1991-10-08

1993-02-09

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4106

Patent

active

051845288

ABSTRACT:
A shift timing control for an automatic transmission comprises a hydraulic passage having a first drain port, a first valve having a second drain port, and a second valve disposed between a low clutch release chamber and the hydraulic passage. The second valve selectivity connects the high clutch chamber with the low clutch release chamber in second gear so as to drain off hydraulic fluid within the high clutch chamber and the low clutch release chamber from the first drain port, and the low clutch release chamber with a band brake fourth gear apply chamber in third gear so as to drain off hydraulic fluid within the low clutch chamber and the band brake fourth gear apply chamber from the second drain port.

REFERENCES:
patent: 4445401 (1984-05-01), Ishimaru
patent: 4563918 (1986-01-01), Sugano
patent: 4753134 (1988-06-01), Hayasaki
patent: 4843920 (1989-07-01), Hayasaki et al.
patent: 4867014 (1989-09-01), Sugano
patent: 5003330 (1991-07-01), Okahara
patent: 5005443 (1991-04-01), Sugano
patent: 5050460 (1991-09-01), Sugano

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