Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2007-01-16
2010-12-07
Silbermann, Joanne (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S441000, C180S442000
Reexamination Certificate
active
07845458
ABSTRACT:
A control system (201) for a frame-steered vehicle that includes a first steering cylinder (104) and a second steering cylinder (105). The steering cylinders are arranged for frame-steering of the vehicle. The system includes a first drive unit (202) and a second drive unit (204), each of which has an electrical machine (206,208) and a hydraulic machine (210,212). Each respective electrical machine is drivingly connected to its associated hydraulic machine, wherein with a first (210) of the two hydraulic machines is arranged for flow-communication with a piston side (214) of the first steering cylinder (104) and a piston rod side (216) of the second steering cylinder (105). A second (212) of the two hydraulic machines is arranged for flow-communication with a piston side (218) of the second steering cylinder and a piston rod side (220) of the first steering cylinder.
REFERENCES:
patent: 4410057 (1983-10-01), Johnson
patent: 5335926 (1994-08-01), Stolle
patent: 6684975 (2004-02-01), Rudolph
patent: 7412315 (2008-08-01), Wildey et al.
patent: 7434653 (2008-10-01), Khalil et al.
Palo Markku
Vigholm Bo
Adams Tashiana
Novak Druce & Quigg LLP
Silbermann Joanne
Volvo Construction Equipment AB
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