Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1982-09-22
1985-03-26
Staab, Lawrence J.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74866, 74868, 74752A, 74752C, B60K 4104, F16H 374
Patent
active
045065632
ABSTRACT:
In an automatic transmission gear of 4-speed advance type comprising at least 3 pairs of clutches including a friction clutch which hydraulically connects an input shaft and the carrier of Ravigneaux type planet wheel gears for the 4th speed, 2 pairs of brakes and one pair of oneway clutches, it is required to engage two pairs of clutches in order to shift the speed to the 3rd speed while it is necessary to engage another pair of clutches with one pair of brakes for the 4th speed, thereby presenting difficulties in setting transmission timings and an initial engagement torque. The hydraulic control system for an automatic transmission gear according to the present invention is capable of smooth transmission without causing transmission shocks and of improving the durability of clutches and brakes because in the system one pair of clutches is made to engage for the 4th speed in advance after completion of the 3rd speed shifting.
REFERENCES:
patent: 3756358 (1973-09-01), Espenschied et al.
patent: 3935793 (1976-02-01), Murakami
patent: 4125038 (1978-11-01), Hiramatsu
patent: 4224837 (1980-09-01), Croswhite
patent: 4228700 (1980-10-01), Espenschied et al.
patent: 4346626 (1982-08-01), Kawamoto
patent: 4361060 (1982-11-01), Smyth
patent: 4367528 (1983-01-01), Kawamoto et al.
patent: 4420994 (1983-12-01), Muller et al.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Quiray Arthur T.
Staab Lawrence J.
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