Work vehicle with a speed change device

Details Work vehicle with a speed change device Work vehicle with a speed change device

2005-09-07

2008-12-02

Ho, Ha D. (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C074S335000

Reexamination Certificate

active

07458917

ABSTRACT:
A work vehicle with a speed change device, comprises, a plurality of wheels including at least one driven wheel; an engine for driving the driven wheel; a speed change device provided between the driven wheel and the engine; and automatic shifting mechanism. The automatic shifting mechanism is capable of operating the speed change device to a lower speed position within an automatic shifting range having a predetermined range and is capable of operating the speed change device up to a speed position which the speed change device was in before an operation to the lower speed position was effected, in response to load on the engine. The entirety of the automatic shifting range is changeable to a low speed side and to a high speed side, or the automatic shifting range can be widened to include more speed positions and narrowed to include less speed positions.

REFERENCES:
patent: 6371886 (2002-04-01), Sawa et al.
patent: 6503170 (2003-01-01), Tabata
patent: 6740006 (2004-05-01), Tabata
patent: 7001307 (2006-02-01), Matsunaga et al.
patent: 2002-106697 (2002-04-01), None

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