| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress noise to be produced by an engine in driving a hydraulic pump. SOLUTION: The hydraulic driving vehicle is constituted by disposing traveling means in the left/right of a car body respectively and by driving the left/ right traveling means by a left-side hydraulic motor 21L and a right-side hydraulic motor 21R. This traveling control device is provided with a speed detector 22 for detecting the vehicle traveling speed, and a series/parallel selector valve 54 selectively feeding the hydraulic fluid from a hydraulic pump 52 driven by the engine 51 by connecting the left and right-side hydraulic motors 21L and 21R either in series or in parallel. This device so controls that, when the vehicle traveling speed detected by the speed detector 22 is a prescribed value or less, the left/right-side hydraulic motors 21L and 21R are connected in parallel and, when the vehicle traveling speed exceeds a prescribed value, the left/right-side hydraulic motors 21L and 21R in series.</p> |
