Patent ID: 6401854
Filing Date: 2002-06-11
Classification: B60K,B60Y

Abstract:
A driving system for a working vehicle comprising:main-driving wheels; sub-driving wheels; a first hydraulic pump driven by power from an engine; a first hydraulic motor fluidly connected with said first hydraulic pump; a transmission drivingly connected with an output shaft of said first hydraulic motor; a second hydraulic motor for driving said sub-driving wheels; a second hydraulic pump fluidly connected with said second hydraulic motor, wherein output power from said transmission drives said main-driving wheels and also drives said second hydraulic pump; a steering operating tool; wherein said second hydraulic pump or said second hydraulic motor has variable displacement; and wherein a displacement adjusting means of said second hydraulic pump or of said second hydraulic motor, which has variable displacement, is connected with said steering operating tool, so that said sub-driving wheels are accelerated in proportion to the degree of turning operation of said steering operating tool.