Steering device for construction vehicle

Motor vehicles – Steering gear – With fluid power assist

Reexamination Certificate

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C180S441000, C180S403000

Reexamination Certificate

active

07913801

ABSTRACT:
To provide a steering system for a construction vehicle, which is suited not only for traveling on general roadways but also for work at construction sites and can perform high-reliability steering control.A steering system for a construction vehicle is provided with a directional control valve5for controlling a flow of pressure oil to body-articulating hydraulic cylinders2that perform steering and also with a steering-wheel-operated signal generation means6for outputting by operation of a steering wheel7aa pilot signal to the directional control valve5for switching the valve5. The steering system is also provided with a lever-operated signal generation means for producing by operation of a lever10aa pilot signal to switch the directional control valve5, said lever-operated signal generation means including pressure-proportional solenoid valves12a,12bor the like, selector valves13a,13bswitchable to permit selectively outputting the pilot signal from one of the signal generation means to the directional control valve5, and an automated switching means for switching the selector valves13a,13bsuch that upon operation of the steering wheel7a, the pilot signal from the steering-wheel-operated signal generation means6can be preferentially outputted to the directional control valve5.

REFERENCES:
patent: 5947228 (1999-09-01), Rolando
patent: 6408977 (2002-06-01), Obertrifter et al.
patent: 2008/0277190 (2008-11-01), McCord et al.
patent: 2010/0051376 (2010-03-01), Tanaka et al.
patent: 2010/0108431 (2010-05-01), Makuta et al.
patent: 63-49087 (1988-04-01), None
patent: 8-67263 (1996-03-01), None
patent: 2002-512922 (2002-05-01), None
patent: 2005-297924 (2005-10-01), None
patent: 2005-538883 (2005-12-01), None
patent: WO 2004/024537 (2004-03-01), None

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