System for controlling the pressure of oil in a system for a con

Details System for controlling the pressure of oil in a system for a con System for controlling the pressure of oil in a system for a con

1988-05-04

1989-06-27

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4112, B60K 4118

Patent

active

048418145

ABSTRACT:
A system for a continuously variable transmission has a line pressure control valve having a spool, a first hydraulic circuit having a pump for supplying oil to the transmission through the line pressure control valve. A second hydraulic circuit is provided for supplying oil to the line pressure control valve so as to shift the spool. A flow rate control valve is provided in the second hydraulic circuit for regulating flow rate of oil passing therein to a constant value, and a reducing valve is provided in the second hydraulic circuit at a downstream position of the flow rate control valve so as to produce a constant pressure of oil. The constant pressure is regulated by a control valve so as to shift the spool of the line pressure control valve, thereby controlling line pressure.

REFERENCES:
patent: 4628773 (1986-12-01), Itoh et al.
patent: 4644827 (1987-02-01), Tanako et al.
patent: 4663991 (1987-05-01), Nakamura et al.
patent: 4674363 (1987-06-01), Miyawaki
patent: 4735597 (1988-04-01), Cadee 74861

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