Transmission control system with separate shift timing control p

Details Transmission control system with separate shift timing control p Transmission control system with separate shift timing control p

1986-06-16

1987-08-25

Rolnicki, Joseph M.

Machine element or mechanism

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

Preselected indexed position

74868, B60K 4106

Patent

active

046884513

ABSTRACT:
In an upshift timing system which provides a drain passage at higher flow resistance for a first friction engaging device to be disengaged when a hydraulic fluid pressure of a second friction engaging device to be engaged supplied as an actuating pressure to a control port of an upshift timing control valve is less than a certain value and at lower flow resistance when the actuating pressure is greater than the certain value, the control port is supplied with the actuating pressure directly from a pressure chamber of the second friction engaging device via a passage which is separate from a passage which supplies actuating pressure from a pressure source to the pressure chamber of the second friction engaging device.

REFERENCES:
patent: 3365985 (1968-01-01), Johnson
patent: 3500706 (1970-03-01), Oberpichler
patent: 3554057 (1971-01-01), Michnay et al.
patent: 3842693 (1974-10-01), Oberpichler
patent: 4274307 (1981-06-01), Iwanaga et al.
patent: 4291596 (1981-09-01), Sakakibara
patent: 4308765 (1982-01-01), Iwanaga et al.
patent: 4313354 (1982-02-01), Iwanaga et al.
patent: 4334441 (1982-06-01), Iwanaga et al.
patent: 4462278 (1984-07-01), Murakami et al.
patent: 4501173 (1985-02-01), Honig

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