Pump control arrangement for automatic automotive transmission o

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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74752C, 74869, B60K 4116

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active

045986126

ABSTRACT:
In order to prevent excessive pump output drain off and ensure that the hydraulic pressure supplied to a control chamber of a variable capacity pump of a hydraulically controlled automatic automotive transmission control system, is maintained at an appropriate level with respect to the control pressure (line pressure) being utilized in the control system, a pressure limiting valve is disposed between a drain port of a pressure regulating valve and the torque converter which operatively interconnects the prime mover (engine) with transmission. This pressure limiting valve includes a spool which is biased in a direction to reduce the pressure passed therethrough to the torque converter by the pressure prevailing in a feedback chamber which communicates with the conduiting between the valve and the torque converter.

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patent: 2950629 (1960-08-01), Holdeman et al.
patent: 3077122 (1963-02-01), Olsen
patent: 3078736 (1963-02-01), Meads et al.
patent: 3159051 (1964-12-01), Herndon et al.
patent: 3592083 (1971-07-01), Kawabata
patent: 3937108 (1976-02-01), Will
patent: 4301697 (1981-11-01), Iwanaga et al.
"A New Automatic Transmission for Improved Fuel Economy--General Motors THM 125", Erkki A. Koivunen & Philip A. Le Bar, Jr., Society of Automotive Engineers, 1979.
Patent Abstracts of Japan, vol. 4, No. 94, Jul. 8, 1980.
European Search Report.

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