Power plants – Pressure fluid source and motor – Expansible chamber type volumetric responsive measuring...
Patent
1982-06-14
1986-11-04
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Expansible chamber type volumetric responsive measuring...
60385, 13759613, B62D 508
Patent
active
046204164
ABSTRACT:
An improved fluid controller (17) is disclosed of the type for use in a load sensing hydrostatic steering system. The system includes a load sensing priority flow control valve (15) of the type which operates on a dynamic load signal. The controller includes a spool valve (95) and a sleeve valve (97) which cooperate to define a plurality of orifices including a main variable flow control orifice (71) and a variable orifice (75) through which fluid flows from the return side of a steering cylinder (19) to the return port (25) of the controller. A variable drain orifice (76) communicates between the main flow path, downstream of the main orifice (71) and the return port (25). As the controller valving moves from its neutral position toward an operating position, the orifice (75) begins to open at least as soon as the main orifice (71) and reaches a predetermined flow area before the main orifice (71) reaches that predetermined flow area. In addition, the drain orifice (76) remains open at least until the variable orifice (75) begins to open to reduce undesirable high transition pressures in the controller.
REFERENCES:
patent: 3455210 (1969-07-01), Allen
patent: 3971216 (1976-07-01), Miller
patent: 4043419 (1977-08-01), Larson et al.
patent: 4065921 (1978-01-01), Baatrup et al.
patent: 4096883 (1978-06-01), Yip
Novacek William J.
Yip James K.
Eaton Corporation
Garrett Robert E.
Grace C. H.
Husar John M.
Kasper L. J.
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