Shift control device for an automatic transmission

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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Details

74861, 74866, 74868, B60K 4106

Patent

active

043466273

ABSTRACT:
A shift control device for an automatic transmission comprises a pressure hold valve equipped with a pressure oil and an oil chamber wherein said pressure oil is connected to an oil passage being between a shift valve and an oil servo and equipped line pressure is supplied to said oil chamber, and a flow control valve which restricts exhausting of the pressure oil of said pressure hold valve; wherein oil is exhausted through a fore-stage shift valve after the oil pressure of the oil pressure servo to be released is held in the appointed times at the shift where fore-stage engaging elements are disengaged and other engaging elements are allowed to operate without passing through the one-way clutch of an automatic transmission.

REFERENCES:
patent: 3525275 (1970-08-01), Lemieux
patent: 3691872 (1972-09-01), Schaefer
patent: 3709064 (1973-01-01), Schaefer
patent: 3709066 (1973-01-01), Burcz
patent: 3724292 (1973-04-01), Borman
patent: 3797330 (1974-03-01), Ushijima
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patent: 3832915 (1974-09-01), Hiramatsu
patent: 3886819 (1975-06-01), Lentz
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patent: 3943799 (1976-03-01), Sakai et al.
patent: 4111072 (1978-09-01), Harmon et al.
patent: 4143563 (1979-03-01), Shindo et al.
patent: 4145937 (1979-03-01), Shindo et al.
patent: 4148232 (1979-04-01), Moriya

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