HYDROSTATIC TRANSMISSION USING FLOW DISCHARGED FROM SAME PUMP, HAVING A POWER TAKE-OFF CLUTCH

摘要

PURPOSE: A hydrostatic transmission using flow discharged from a same pump is provided to use flow from the main pump for driving the hydrostatic transmission pump, and to operate the PTO(power take-off) clutch with part of flow by integrally connecting the PTO clutch with the hydrostatic transmission. CONSTITUTION: A main pump(2) drives by receiving power from an engine, and an integrated hydrostatic transmission(50) inputs flow from the main pump. The hydrostatic transmission is composed of a selection valve(53) selectively controlling the passage to stream flow from the main pump through an oil filter(51) to a PTO clutch cylinder(52), a pilot line(54a) of a third relief valve(54) regulating hydraulic pressure by switching the passage with the selection valve in filling flow, a fourth relief valve(55) inputting flow drained from the third relief valve with hydraulic pressure applied to the pilot line, a hydrostatic transmission pump(56) operating the hydrostatic transmission by inputting flow according to hydraulic pressure of a pilot line(55a), and a hydrostatic transmission motor(57).