Oil pressure circuit for an automatic transmission

Details Oil pressure circuit for an automatic transmission Oil pressure circuit for an automatic transmission

1988-04-28

1989-06-27

Wright, Dirk

Machine element or mechanism

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

Preselected indexed position

B60K 4118

Patent

active

048418137

ABSTRACT:
The multistage transmission gear mechanism is provided with a first and second coupling means for shifting speed stages, each being of a type operable hydraulically and adapted to allow four speed stages from first to fourth speed stages to be selected in accordance with a combination between a coupled state and an uncoupled state of the first and second coupling means. A third coupling means is further provided for ensuring engine braking.
The second coupling means is engaged or coupled by a first pilot pressure generated by a first solenoid at the second, third and fourth speed stages. The first coupling means is coupled by a second pilot pressure generated by a second solenoid at the third and fourth speed stages. The third coupling means is coupled at the second and third speed stages.
A third solenoid is provided for generating a third pilot pressure which prevails over the first pilot pressure and controls shifting the second coupling means at the third speed stage.
At shifting between the second and third speed stages, the second pilot pressure prevails over the first pilot pressure to being the second coupling means into a state of its shifting being controlled by the third pilot pressure. At this time, shifting the third coupling means is controlled by the first pilot pressure to avoid a temporary engagement of all the three coupling means, thus preventing a transmission shock.

REFERENCES:
patent: 4527448 (1985-07-01), Person et al.
patent: 4727773 (1988-03-01), Sumiya et al.
patent: 4742732 (1988-05-01), Hiramatsu

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