초록 ▼

A four-wheel hydraulic drive system for a working vehicle comprising a hydraulic pump, a first hydraulic motor fluidly connected with said hydraulic pump, a pair of first driving wheels driven by said first hydraulic motor, a second hydraulic motor fluidly connected with said hydraulic pump, and a p

A four-wheel hydraulic drive system for a working vehicle comprising a hydraulic pump, a first hydraulic motor fluidly connected with said hydraulic pump, a pair of first driving wheels driven by said first hydraulic motor, a second hydraulic motor fluidly connected with said hydraulic pump, and a pair of second driving wheels driven by said second hydraulic motor, wherein the drive mode of said vehicle can be switched between a first four-wheel drive mode for substantially equaling the torque of said second hydraulic motor to that of said first hydraulic motor and a second four-wheel drive mode for making the torque of said second hydraulic motor smaller than that of first hydraulic motor.

대표청구항 ▼

[ What is claimed is:] [1.] A four-wheel hydraulic drive system for a working vehicle comprising:a variable displacement hydraulic pump;a first fixed displacement hydraulic motor fluidly connected with said hydraulic pump;a pair of first driving wheels driven by said first hydraulic motor;a second f

[ What is claimed is:] [1.] A four-wheel hydraulic drive system for a working vehicle comprising:a variable displacement hydraulic pump;a first fixed displacement hydraulic motor fluidly connected with said hydraulic pump;a pair of first driving wheels driven by said first hydraulic motor;a second fixed displacement hydraulic motor fluidly connected with said hydraulic pump;a pair of second driving wheels driven by said second hydraulic motor; andmeans for changing the torque of said second hydraulic motor, wherein said means substantially equalizes the torque of said second hydraulic motor to that of said first hydraulic motor for providing a first four-wheel drive mode of said vehicle, and reducing the torque of said second hydraulic motor to be smaller than that of said first hydraulic motor for providing a second four-wheel drive mode of said vehicle.