Pumps – Expansible chamber type – Having separate noncyclic valve
Patent
1989-12-11
1990-11-06
Fox, John C.
Pumps
Expansible chamber type
Having separate noncyclic valve
91497, F04B 110
Patent
active
049682270
ABSTRACT:
A variable displacement, rotary fluid pressure pump (11) is disclosed of the type having a cam ring member (25) which is movable, in response to rotation of a control shaft (35), between a neutral position (FIG. 5) and a displaced position (FIG. 4). The pump housing (13, 15) includes a support member (25), and they cooperate to define a high-pressure fluid passage (51). In communication with the passage (51) is a recess (71), in which is disposed a dampening shoe (73). The dampening shoe is biased by high-pressure fluid in the passage (51) into engagement with an adjacent surface (77) of the cam ring (25). The surface (77) defines a neutral fluid passage (79), and the dampening shoe (73) defines a restricted opening (85). When the cam ring (25) is in the displaced position, the restricted opening (85) is blocked from communication with the neutral passage (79), but as the cam ring is returned to its neutral position, the opening (85) begins to communicate with the neutral passage (79), thus providing the pump with an increased neutral band overlap.
REFERENCES:
patent: 3020890 (1962-02-01), Grad
patent: 3022741 (1962-02-01), Brundage
patent: 4091717 (1978-05-01), Bojas et al.
Casey James M.
Jennen Mark S.
Szulczewski Dennis E.
Eaton Corporation
Fox John C.
Kasper L. J.
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