Steering system for working truck

Motor vehicles – Steering gear – Each wheel steerable

Reexamination Certificate

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Details

C180S417000, C180S428000, C180S441000

Reexamination Certificate

active

07114591

ABSTRACT:
One of the mode lamps38a, 38band38cof the mode indicator38corresponding to the current steering mode is turned on yellow and the other mode lamps are turned on green or turned off, thereby indicating whether front wheels1, 1and rear wheels2, 2are at neutral. A controller39does not operate a mode changing valve24even with an instruction outputted from a mode change switch35when the front and rear wheels are not at neutral, and operates, in response to an instruction outputted from the mode change switch35, the mode changing valve24to establish a steering mode corresponding to the instruction when the front and rear wheels are at neutral. Also, the mode indicator38is controlled to always indicate, as the current steering mode, one corresponding to the steering mode actually established by the mode changing valve24. With those features, in a working vehicle in which the mode of steering front and rear wheels can be changed over between two-wheel steering and four-wheel steering, a steering system having superior operability and high reliability can be provided.

REFERENCES:
patent: 3596730 (1971-08-01), Cecce
patent: 3856102 (1974-12-01), Queen
patent: 3903983 (1975-09-01), Yeske
patent: 4621702 (1986-11-01), Kanazawa et al.
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patent: 4798393 (1989-01-01), Miura et al.
patent: 5020627 (1991-06-01), Wittke
patent: 5515026 (1996-05-01), Ewert
patent: 6481524 (2002-11-01), Ishida et al.
patent: 300 774 (1989-01-01), None
patent: 0439370 (1991-01-01), None
patent: 439 370 (1991-07-01), None
patent: 3-61477 (1991-06-01), None
patent: 4-19267 (1992-01-01), None
patent: 4-230474 (1992-08-01), None
patent: 7-23686 (1995-05-01), None

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