Steer valve with hydraulic vehicle position feedback

Details Steer valve with hydraulic vehicle position feedback Steer valve with hydraulic vehicle position feedback

2005-10-07

2009-02-17

Rivell, John (Department: 3753)

Fluid handling

Systems

Multi-way valve unit

C060S384000, C060S387000

Reexamination Certificate

active

07490626

ABSTRACT:
A fluid controller (17) controls a main fluid path (18) from a pump (11) to a primary steering cylinder (19) and a second fluid path (26) from a fluid meter (37) to a second cylinder (31). A mechanical or electrical linkage (149) couples the primary steering cylinder (19) to the second cylinder (31) such that displacement of the primary cylinder (19) results in proportional corresponding displacement of the second cylinder (31). The main fluid path (18) and the second fluid path (26) are maintained separate from each other. As such, the main fluid path (18) provides pressurized fluid from the pump to the primary steering cylinder (19) without communicating main fluid flow to the secondary cylinder (31). Due to the separate fluid paths, the present invention can be used to provide a substantial amount of fluid through a fluid controller (17) with a relatively small displacement fluid meter (37).

REFERENCES:
patent: 2613703 (1952-10-01), Calvert
patent: 3482398 (1969-12-01), Christensen
patent: 3525212 (1970-08-01), Gallant
patent: 3584537 (1971-06-01), Schulz
patent: 4096883 (1978-06-01), Yip
patent: 4553389 (1985-11-01), Tischer et al.
patent: 4620416 (1986-11-01), Yip et al.
patent: 4759182 (1988-07-01), Haarstad
patent: 4972916 (1990-11-01), Miller
patent: 5975138 (1999-11-01), Uppal
patent: 6782698 (2004-08-01), Gehlhoff
patent: 2003/0037827 (2003-02-01), Novacek

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