Pumps – With condition responsive pumped fluid control – Fluid flow rate responsive
Patent
1998-06-08
2000-10-31
Thorpe, Timothy S.
Pumps
With condition responsive pumped fluid control
Fluid flow rate responsive
417308, 417310, F04B 4900
Patent
active
061392855
ABSTRACT:
A hydraulic pump including a pressure chamber, a drain passage communicable with the pressure chamber, a delivery port, a discharge path fluidly connecting the pressure chamber with the delivery port, and an orifice disposed in the discharge path. A first flow control valve is provided for variably controlling fluid communication between the pressure chamber and the drain passage in response to a difference between fluid pressures upstream and downstream of the orifice. A second flow control valve is disposed within the discharge path, which is operative to variably control an opening area of the orifice in response to energy of fluid passing through the discharge path. The second flow control valve includes a moveable spool exposed to a fluid pressure within the pressure chamber, a spring biasing the spool in such one direction as to increase the opening area of the orifice, and a spring retainer cooperating with the spool to define a spring chamber accommodating the spring.
REFERENCES:
patent: 3266426 (1966-08-01), Brunson
patent: 3446230 (1969-05-01), Swedberg
patent: 4597718 (1986-07-01), Nakano et al.
patent: 4714413 (1987-12-01), Duffy
patent: 5032061 (1991-07-01), Porel
patent: 5098259 (1992-03-01), Ohtaki et al.
patent: 5226802 (1993-07-01), Nakamura et al.
patent: 5236315 (1993-08-01), Hamao et al.
patent: 5513960 (1996-05-01), Uemoto
patent: 5803716 (1998-09-01), Wallis et al.
patent: 5810565 (1998-09-01), Eppli
patent: 5860797 (1999-01-01), Fujimura et al.
Ishii Tetsuya
Ishizuka Atsushi
Uchida Yukio
Yamamuro Masateru
Thorpe Timothy S.
Torrente David J.
Unisia Jecs Corporation
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