The invention discloses a direct-acting overflow motor and a hydraulic source loop thereof. The direct-acting overflow motor comprises an
air filter, a first stop valve, a pressure adjustment screw, apressure measurement oil path, a motor member, an oil
bottle, a pressure adjustment device shell body, a
pressure measurement piston rod, a
pressure measurement spring, a variable
piston rod, and a
swash plate push rod. According to the direct-acting overflow motor and the hydraulic source loop thereof,
system pressure oil is led into a
pressure measurement cavity through the pressure measurementoil path, and control pressure oil is enabled to directly act on a pressure measurement
piston, and when a control pressure is greater than a
spring force, the pressure measurement
piston rod moves,and achieves a balanced state at a new position with the
spring force; the pressure measurement
piston rod moves to push oil sealed in a displacement amplification cavity to move, a force is transferred to a variable piston to drive the variable piston to move, and the purpose of increasing a displacement is achieved through the section area difference between the pressure measurement
piston rod and the variable piston rod; and the variable piston rod drives the
swash plate push rod to rotate to change the inclination angle of a motor
swash plate, so that the displacement of a motor is changedto adapt to the overflow flow
rate change of a
system, and the pressure of an oil inlet port of the motor is enabled to keep constant.