Minimizing delay in low temperature engagement of automatic tran

Details Minimizing delay in low temperature engagement of automatic tran Minimizing delay in low temperature engagement of automatic tran

1988-09-01

1990-06-05

Diehl, Dwight G.

Machine element or mechanism

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

Preselected indexed position

B60K 4104

Patent

active

049303767

ABSTRACT:
A system for pressurizing a friction element of an automatic transmission supplied concurrently from two hydraulic passages through a shuttle valve where the two sources of supply pressure are combined. A control valve proeduces regulated output pressure by balancing control feedback pressure against a spring force without venting any portion of the system. The shuttle valve includes a shuttle ball for sealing ports connected to both supply sources and maintains an open connection between the direct clutch and a pocket in which the shuttle ball is retained. AN accumulator includes a plunger separating first and second volumes. One volume expands as hydraulic fluid at regulated output pressure exits the control valve. The volume expands at a regulated time rate controlled by the magnitude of TVLM control pressure, a compression spring force and the flow rate through an orifice of predetermined size.

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U.S. Ser. No. 24,500 filed Mar. 11, 1987.
U.S. Ser. No. 927,624 filed Nov. 6, 1984.

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