Patent ID: 7389847
Filing Date: 2008-06-24
Classification: A01D,B60K,B60W,B62D,F16H

Abstract:
1. A hydraulic four-wheel driving articulated vehicle comprising: a first frame, on which first wheels and a first hydraulic motor driving the first wheels are mounted; a second frame, on which second wheels and a second hydraulic motor driving the second wheels are mounted, wherein the first and second frames are connected to each other so as to be relatively rotatable centering on a vertical axis by a steering operation; a hydraulic pump; a hydraulic circuit fluidly connecting the first and second hydraulic motors in series to the hydraulic pump, the hydraulic circuit including pressure control means connected to the third passage so as to automatically release the excessively accumulated oil from the third passage when the vehicle is stationary and the first and second frames are relatively rotated by the steering operation so as to excessively accumulate oil in the third passage.