Hydraulic control system with 4-2 timing arrangement for automat

Details Hydraulic control system with 4-2 timing arrangement for automat Hydraulic control system with 4-2 timing arrangement for automat

1984-02-17

1987-05-19

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74869, B60K 4116

Patent

active

046657762

ABSTRACT:
Disclosed herein is a hydraulic control system for an automatic transmission wherein a first friction unit (C3) is engaged and a second friction unit (C2) is disengaged in downshifting from the 4th speed ratio to the 2nd speed ratio. An orifice device (660) is disposed in a fluid supply passage to a second port (124h) of a 3-4 shift valve (24) which is allowed to communicate with a first port (124g) communicating with the first friction unit (C3) when the 3-4 shift valve assumes a downshift position thereof. A timing valve (23) is arranged to provide a first bypass passage bypassing the orifice device when a fluid pressure in the second friction unit (C2) is lower than a predetermined value. A second bypass passage is provided to bypass the orifice device when the 2-3 shift valve (22) assumes an upshift position thereof.

REFERENCES:
patent: 3136175 (1964-06-01), Ivey
patent: 3656373 (1972-04-01), Shimosaki
patent: 3707890 (1973-01-01), Ito
patent: 3710638 (1973-01-01), Sakai
patent: 3728915 (1973-04-01), Clark
patent: 3896685 (1975-07-01), Shellman
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patent: 4413536 (1975-01-01), Whitney et al.
patent: 4446759 (1984-05-01), McCrary
patent: 4467675 (1984-08-01), Sugano et al.
patent: 4474084 (1984-10-01), Sugano et al.
patent: 4476747 (1984-10-01), Kawamoto

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