Patent ID: 7779630
Filing Date: 2010-08-24
Classification: F04B,F15B,F16H

Abstract:
1. A hydraulic stepless speed changing device, comprising: a variable displacement hydraulic pump having a movable pump swash plate; a variable displacement hydraulic motor having a movable motor swash plate; a closed circuit including a main oil path connecting the hydraulic pump and the hydraulic motor to each other; a hydraulic servo mechanism for controlling swash plate angles of the respective movable pump and motor swash plates, wherein the hydraulic servo mechanism includes: a housing incorporating the hydraulic pump, the hydraulic motor, the closed circuit and the hydraulic servo mechanism together; a pump load control mechanism formed on the housing on the hydraulic pump side of the hydraulic servo mechanism, wherein the pump load control mechanism includes: a motor load control mechanism formed on the housing on the hydraulic motor side of the hydraulic servo mechanism, wherein the motor load control mechanism includes: