Hydraulic control system for automatic transmission with shockle

Details Hydraulic control system for automatic transmission with shockle Hydraulic control system for automatic transmission with shockle

1984-02-17

1986-08-26

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74759, B60K 4108, F16H 5710

Patent

active

046075429

ABSTRACT:
Disclosed herein is a hydraulic control system for an automatic transmission wherein a first friction unit (C3) is engaged in downshifting from the 4th speed ratio to the 3rd speed ratio and it is engaged in downshifting from the 4th speed ratio to the 2nd speed ratio. A first port (124g) of a 3-4 shift valve (24) communicates with the first friction unit (C3) and it is allowed to communicate with a second port (124h) when the 3-4 shift valve (22) assumes a downshift position thereof. The second port (124h) communicates via a first passage (454) with a fluid conduit (412) supplied with an actuating fluid pressure. A second passage (452) is provided which connects the second port (124h) to the fluid conduit (412). The first and second passages are provided with first and second orifice devices (662, 660), respectively. The second fluid passage (452) is blocked when a 2-3 shift valve (22) assumes a downshift position thereof.

REFERENCES:
patent: 3656373 (1972-04-01), Shimosaki
patent: 3707890 (1973-01-01), Ito
patent: 3728915 (1973-04-01), Clark
patent: 3896685 (1975-07-01), Shellman
patent: 4446759 (1984-05-01), McCrary

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