Machine element or mechanism – Gearing – With fluid drive
Patent
1992-12-11
1994-12-27
Bonck, Rodney H.
Machine element or mechanism
Gearing
With fluid drive
475120, F16H 4700
Patent
active
053754832
ABSTRACT:
A directional control valve of a hydraulic pressure control system for an automatic transmission includes a housing, a valve spool, and a compression spring, whereby the housing has five ports. This directional control valve operates such that during the second-third up-shift the pressure of a front clutch and a servo brake release pushes the valve spool in FIG. 1 to the left side so that the port for oil supply to the end clutch opens. Accordingly, the hydraulic pressure is supplied to the end clutch as well as to the sensing chamber in the right side so that even when the oil pressure of the front clutch and servo brake is released, the pressure in the sensing chamber overcomes the elastic force of compression spring and pushes the valve spool to the left side continuously in the fourth speed range.
REFERENCES:
patent: 3667322 (1972-06-01), Noguchi et al.
patent: 4506563 (1985-03-01), Hiramatsu
patent: 4519273 (1985-05-01), Shimizu et al.
patent: 4942787 (1990-07-01), Aoki et al.
patent: 5003842 (1991-04-01), Hatta et al.
patent: 5115696 (1992-05-01), Takada et al.
patent: 5154099 (1992-10-01), Asatsuke et al.
Jang Jaedeog
Kim Youngbae
Bonck Rodney H.
Hyundai Motor Company
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