Work vehicle having hydraulic stepless speed changing apparatus

Details Work vehicle having hydraulic stepless speed changing apparatus Work vehicle having hydraulic stepless speed changing apparatus

2011-08-30

2011-08-30

Wright, Dirk (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

Reexamination Certificate

active

08007403

ABSTRACT:
A work vehicle includes a hydraulic stepless speed changing apparatus and a gear type speed changing apparatus operable to receive output from the hydraulic stepless speed changing apparatus to convert it into a plurality of stages of speed. A return oil passage connected to a high-pressure side circuit of the hydraulic stepless speed changing apparatus is connected to a hydraulic tank. The return oil passage incorporates an unload valve and a throttle valve, between which an operably coupling mechanism is provided. This operably coupling mechanism switches over the unload valve to an unload condition in response to an operational displacement of a brake operating member for operating a brake to its braking side.

REFERENCES:
patent: 4967610 (1990-11-01), Sasajima et al.
patent: 2004/0163490 (2004-08-01), Nakatani et al.
patent: 2007/0219047 (2007-09-01), Nakatani et al.
patent: 2004-257447 (2004-09-01), None
patent: 2007-239978 (2007-09-01), None

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