Patent ID: 6250180
Filing Date: 2001-06-26
Classification: F16H,Y10T

Abstract:
A traveling mechanism having a driving motor (24) driving at least a hydrostatic variable displacement pump (2), the hydrostatic variable displacement pump (2) and a hydrostatic variable displacement motor (1) forming a hydrostatic circuit, the hydrostatic variable displacement motor (1) driving a gear mechanism (11), and a direction valve (18) and a pressure-reducing valve (10) being provided for regulating a hydraulic control pressure supplied to the hydrostatic variable displacement motor (1);wherein the gear mechanism (11) is a hydrostatically driven 2-speed gear mechanism having a synchronization unit (14), the hydrostatic variable displacement motor (1) has a motor displacement capacity regulated by the hydraulic control pressure supplied to the hydrostatic variable displacement motor and an output hydraulic pressure, the hydraulic control pressure and the output hydraulic pressure are balanced by a feedback spring (9), and the hydrostatic variable displacement motor (1) has a zero lift position such that a gear shift of the gear mechanism (11) only can occur at the zero lift position when a driving torque to be transmitted by the hydrostatic variable displacement motor (1) is at a minimum value.