Constant output fluid pump

Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage

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Details

417222, F04B 126

Patent

active

043348327

ABSTRACT:
A variable displacement rotary pump includes a tiltable cam plate which varies the pump displacement as a function of the fluid pressure in a control chamber. The pump pumps fluid to a fluid motor via an orifice in an outlet passage. A spool valve meters fluid to the control chamber in response to the differential pressure across the orifice. Pressure on one side of the orifice acts upon the spool valve in a feedback chamber remote from the outlet passage. The orifice is defined by an annular space between the wall of the outlet passage and neck portion of the spool valve. A feedback passage in the spool valve communicates fluid pressure from the one side of the orifice to the feedback chamber. A leakage flow path extends through a bearing to provide for automatic bearing lubrication.

REFERENCES:
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patent: 2845876 (1958-08-01), Keel
patent: 3096723 (1963-07-01), Puryear
patent: 3117457 (1964-01-01), Burt
patent: 3188971 (1965-06-01), Puryear
patent: 3339489 (1967-09-01), Mowbray
patent: 3350881 (1967-11-01), D'Amato
patent: 3676020 (1970-02-01), Andreason et al.
patent: 3784327 (1974-01-01), Lonnemo
patent: 3788773 (1974-01-01), Van der Kolk
patent: 4013380 (1977-05-01), Pensa
patent: 4137716 (1979-02-01), Budyich
patent: 4142841 (1979-03-01), Claar

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