Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1989-08-02
1991-05-07
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74868, B60K 4106
Patent
active
050127004
ABSTRACT:
For an automatic transmission for a vehicle such as an automobile having a speed stage shifting mechanism including parallelly arranged first and second hydraulically operated input clutches and adapted to provide the 3rd speed stage in which the first and second input clutches C.sub.1 and C.sub.2 are both engaged and the overdrive 4th stage in which the clutch C.sub.1 is disengaged and the clutch C.sub.2 is engaged, the engagement of the clutch C.sub.1 in the 3rd speed stage being not essential unless engine brake availability is required, a hydraulic control device has a hydraulic pressure supply control device for variably controlling speed of supply of a hydraulic pressure to the first input clutch C.sub.1 according to conditions for engaging the first input clutch such whether it is a kickdown of an overdrive inhibition, and a hydraulic pressure exhaustion control device for controlling speed of exhaustion of a hydraulic pressure from the first input clutch C.sub.1 independently of the hydraulic pressure supply control device to be substantially higher than the speed in the supply.
REFERENCES:
patent: 4637281 (1987-01-01), Vanselous
patent: 4665776 (1987-05-01), Sugano
patent: 4722251 (1988-02-01), Sumiya et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4829853 (1989-05-01), Sakaguchi
Funahashi Makoto
Itoh Hiroshi
Takada Mitsuru
Takahashi Tokuyuki
Braun Leslie A.
Levi Benjamin
Toyota Jidosha & Kabushiki Kaisha
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