Patent ID: 9592733
Date: 2017-03-14
CPC Classifications: B60K,B60Y,E02F,F16H

Claim:
1. A working machine comprising: a ground engaging structure comprising at least first and second axles, each mounting at least two wheels; a body supported on the ground engaging structure; a working arm mounted to the body so as to be capable of performing working operations; and a drive arrangement for moving the ground engaging structure to propel the working machine, the drive arrangement including a prime mover and transmission; and wherein the transmission comprises a hydraulic pump driven by the prime mover, a first high speed hydraulic motor to be supplied with hydraulic fluid from the hydraulic pump to drive the first axle to permit the working machine to be driven at relatively high speeds in a first two-wheel drive operating mode, and a second relatively low speed hydraulic motor to be supplied with hydraulic fluid from the hydraulic pump to drive the second axle at relatively low speeds and configured to be driven in conjunction with the first motor in a second four-wheel drive operating mode; wherein the first high speed hydraulic motor comprises a high speed swash plate hydraulic motor and the second low speed hydraulic motor comprises a low speed swash plate hydraulic motor; wherein the high speed swash plate hydraulic motor has a relatively large displacement range and wherein the low speed swash plate hydraulic motor has a smaller displacement range relative to the high speed swash plate hydraulic motor.