Patent ID: 8800279
Filing Date: 2014-08-12
Classification: B60Y,F15B,F16H

Abstract:
1. A hydraulic transmission system for a zero-turn vehicle, comprising: first and second transaxles each of which includes: a charge pressure regulation valve disposed in the casing of the first transaxle and connected to the charge passage of the first transaxle so as to regulate a pressure of fluid in the charge passage of the first transaxle so that fluid released from the charge pressure regulation valve is fully supplied to the first port of the first transaxle without branching; a first pipe disposed outside of the casings of the first and second transaxles so as to connect the first ports of the respective first and second transaxles to each other; a drain passage disposed in the casing of the second transaxle so as to connect the first port of the second transaxle to the fluid sump of the second transaxle, whereby part of the fluid flowing in the charge passage of the first transaxle is drained to the fluid sump of the second transaxle via the charge pressure regulation valve, the first pipe and the drain passage; and a second pipe disposed outside of the casings of the first and second transaxles so as to connect the second ports of the respective first and second transaxles to each other, whereby overflowing fluid of the fluid sump of the second transaxle is released to the fluid sump of the first transaxle via the second pipe.