Hydraulic control system for automatic transmission

Details Hydraulic control system for automatic transmission Hydraulic control system for automatic transmission

1983-07-29

1986-04-01

Krizmanich, George H.

Machine element or mechanism

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

Preselected indexed position

74868, 74752C, B60K 4116

Patent

active

045790205

ABSTRACT:
A hydraulic control system for an automatic transmission comprises a shift valve being communicating with a first chamber, and a second shift valve communicating with second and third chambers in addition to the first chamber. The first shift valve has an upshift position wherein it pressurizes the first chamber. The second shift valve has a downshift position wherein it pressurizes the second chamber and provides a communication between the first and third chambers to pressurize the third chamber, and an upshift position wherein it discharges the second and third chambers.

REFERENCES:
patent: 3212357 (1965-10-01), Knowles et al.
patent: 3561295 (1971-02-01), Iijima
patent: 3605525 (1971-09-01), Pierce et al.
patent: 3656373 (1972-04-01), Shimosaki
patent: 3724292 (1973-04-01), Borman
patent: 3890856 (1975-06-01), Miyanchi et al.

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