Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1988-12-08
1990-01-02
Michalsky, Gerald A.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
192 8713, 192109F, F15B 1302
Patent
active
048906360
ABSTRACT:
A fluid pressure control for a transmission having a fluid pressure operated clutch includes a pressure regulating piston communicating with a pressurized fluid source for affording fluid pressure to the clutch; a load piston disposed in a common bore with the pressure regulating piston wherein the pistons are reciprocally disposed in such common bore and are biased away from one another by an associated spring; and a signal pressure chamber is formed between an end of the bore and an end wall of the load piston and communicates with a fluid passage running from the pressurized fluid source to the clutch. Concaved fluid communication grooves are provided in a sliding face of the load piston wherein a first groove communicates with the signal pressure chamber, a second groove communicates with a discharge port and a third groove communicates with the pressurized fluid source via a timing orifice. A shifting piston is provided which reciprocatingly moves between opened and closed positions within the load piston to thereby increase or reduce pressurizing within the signal pressure chamber in accordance with positions of the load piston and the shifting piston.
REFERENCES:
patent: 3468194 (1969-09-01), Horsch et al.
patent: 4132302 (1979-01-01), Chatterjea
patent: 4216851 (1980-08-01), Chatterjea
patent: 4311068 (1982-01-01), Chatterjea
patent: 4387731 (1983-06-01), Chatterjea
Michalsky Gerald A.
Okamura Corporation
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