Patent ID: 8585156

Claim:
A travel control device for a work vehicle, comprising: a hydraulic pump; a hydraulic motor for driving front wheels and a hydraulic motor for driving rear wheels with pressure oil delivered from the hydraulic pump, connected to the hydraulic pump in parallel through a closed-circuit connection; a slip detection device that detects a slip occurring at any of the front wheels and the rear wheels; and a displacement reducing device that reduces, upon detection of a slip occurring at any of the front wheels and the rear wheels by the slip detection device, a motor displacement of a hydraulic motor for driving the wheel at which the slip has been detected, among the hydraulic motor for driving the front wheels and the hydraulic motor for driving the rear wheels; wherein the displacement reducing device quickly reduces the motor displacement of the hydraulic motor upon the detection of a slip by the slip detection device and gradually restores the motor displacement of the hydraulic motor to a value before reduction as the slip detection device determines that a slip is eliminated.