Hydraulic pump and wide band neutral arrangement therefor

Details Hydraulic pump and wide band neutral arrangement therefor Hydraulic pump and wide band neutral arrangement therefor

1999-01-28

2000-05-30

Thorpe, Timothy S.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

417269, F04B 126

Patent

active

060684518

ABSTRACT:
A variable displacement axial piston pump (11) including a housing (19 and a back plate (25), with a cylinder barrel (29) rotating therein, and defining a plurality of cylinders (31), and a piston (33) reciprocably disposed in each one. There is a tiltable swashplate (37) whereby the displacement of the pump can be varied. In one embodiment, an open center shuttle assembly (71) is disposed in the swashplate (37), and interconnects the high and low pressure paths of the pump to provide a wide neutral band. When the pump is displaced intentionally, the resulting pressure in the high pressure path biases the shuttle to a closed position, permitting normal operation of the pump. In a second embodiment, the shuttle assembly (71) is disposed in the back plate (25), and is accompanied by a load holding valve assembly (105), which insures that, when the vehicle is on an incline, the fluid pumped by the propel motors won't flow through the shuttle assembly (71).

REFERENCES:
patent: Re23993 (1955-05-01), Henrichsen
patent: 3282225 (1966-11-01), Moon
patent: 3309870 (1967-03-01), Pinkerton
patent: 4283962 (1981-08-01), Forster
patent: 4584926 (1986-04-01), Beck et al.
patent: 5207144 (1993-05-01), Sporer et al.
patent: 5226349 (1993-07-01), Alme et al.
patent: 5624240 (1997-04-01), Kawaguchi et al.

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