Patent ID: 7533753
Filing Date: 2009-05-19
Classification: A01D,B60K,B60Y,F15B,F16D,F16H

Abstract:
1. A hydraulic wheel driving apparatus for a vehicle, comprising: a first transaxle incorporating a first hydraulic motor and formed therein with a first fluid sump; a second transaxle incorporating a second hydraulic motor and formed therein with a second fluid sump; and a pump unit incorporating a hydraulic pump for hydraulically driving the first and second hydraulic motors, the pump unit being provided therein with a third fluid sump, wherein the pump unit, the first transaxle and the second transaxle are disposed separately from one another, and the hydraulic pump, the first hydraulic motor and the second hydraulic motor are fluidly connected to one another through a closed fluid circuit by pipes thereamong, wherein the first transaxle includes a first bypass valve provided to the first hydraulic motor so as to be able to connect the closed fluid circuit to the first fluid sump, wherein the second transaxle includes a second bypass valve provided to the second hydraulic motor so as to be able to connect the closed fluid circuit to the second fluid sump, and wherein the pump unit includes a third bypass valve provided to the hydraulic pump so as to be able to connect the closed fluid circuit to the third fluid sump.