Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Reexamination Certificate
2005-11-22
2005-11-22
Lopez, F. Daniel (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
C060S468000
Reexamination Certificate
active
06966181
ABSTRACT:
A hydrostatic transmission, comprising a housing, an interior space of the housing serving as a fluid sump; a center section disposed in the housing so as to be submerged In the fluid sump; a hydraulic pump mounted on the center section in the housing: a hydraulic motor mounted on the center section in the housing, and a pair of first and second fluid passages formed within the center section so as to fluidly connect the hydraulic pump with the hydraulic motor. The second fluid passage has an upwardly slant opening toward the fluid sump. A draining device including a relief valve is provided in the opening of the second fluid passage. When hydraulic pressure in the second fluid passage is not more than a predetermined value but not less than that in the first fluid passage, the relief valve is opened so as to drain fluid from the second fluid passage to the fluid sump, thereby keeping the hydrostatic transmission in neutral. When hydraulic pressure in the second fluid passage is more than the predetermined value or less than that in the first fluid passage, the relief valve is closed so as to shut out fluid in the second fluid passage from the fluid sump. The draining device comprises a ball check valve which closes the relief valve by its dead weight when the hydraulic pressure in the second fluid passage is less than the first fluid passage.
REFERENCES:
patent: 3704588 (1972-12-01), Trabbic
patent: 4986073 (1991-01-01), Okada
patent: 5136845 (1992-08-01), Woodley
patent: 5356347 (1994-10-01), Komura et al.
patent: 5546752 (1996-08-01), Horton et al.
patent: 5836159 (1998-11-01), Shimizu et al.
patent: 6508059 (2003-01-01), Takada et al.
Kawakami Manabu
Ohashi Ryota
Lopez F. Daniel
Sterne Kessler Goldstein & Fox P.L.L.C.
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