Speed change gear in a hydraulic type automatic transmission

Details Speed change gear in a hydraulic type automatic transmission Speed change gear in a hydraulic type automatic transmission

1977-04-14

1978-11-14

Scott, Samuel

Machine element or mechanism

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

Preselected indexed position

74865, B60K 4118

Patent

active

041250389

ABSTRACT:
Improvement in a hydraulic type automatic transmission including a fluid torque converter and a plurality of friction-engagement devices associated with hydraulic servo devices in which different speed change ratios including a plurality of forward movement steps can be realized by selectively actuating the friction-engagement devices with a hydraulic pressure either automatically or manually. Upon deceleration from a higher speed gear ratio to a predetermined gear ratio, a friction-engagement device for realizing the predetermined gear ratio is quickly engaged without delay, whereas upon acceleration from a lower speed gear ratio or a neutral condition to the predetermined gear ratio, engagement of the friction engagement device is effected slowly by actuating an accumulator and a flow rate limiter and thereby generation of an excessive shock is prevented.

REFERENCES:
patent: 3442152 (1969-05-01), Chana
patent: 3650160 (1972-03-01), Higuchi et al.
patent: 3752015 (1973-08-01), Murakami
patent: 3792763 (1974-02-01), Enomoto
patent: 3938410 (1976-02-01), Dach et al.
patent: 4006652 (1977-02-01), Murakami
patent: 4046033 (1977-09-01), Hashimoto et al.

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