A8V series hydraulic pumps (including A8V86 and A8V115) are produced by UCHIDA, Japan, and are used on DH200W-Ⅲ excavators (tire type).
1 Overview
This kind of hydraulic pump has one input shaft, two gear boxes (gear transmission ratio is 1:1) driven oblique axis variable type axial piston pump, and is equipped with various control devices. The hydraulic pump also includes two gear pumps as hydraulic pumps for various control and auxiliary tasks.
2. Structure
and the rotating direction of the rotating component on the side of the functional drive shaft is the same as that of the engine, and the rotating component on the follower side rotates in the opposite direction. The two rotary components suck oil from the same suction port S, and the oil separates after entering the inside of the main pump. Oil discharge ports A and A? are respectively connected with the oil discharge pipelines on both sides of the control part. The two rotary components are respectively connected with their respective drive shafts, and each has a cylinder and 7 plungers. Each cylinder body frictionally slides on the spherical valve plate, and the plunger absorbs and discharges oil from the lumbar-shaped groove-shaped oil suction port and the oil discharge port.
The plunger reciprocates in the plunger hole of the cylinder, and the stroke of the plunger depends on the inclination of the cylinder axis and the input axis.
The size of , the inclination angle also determines the output flow of the main pump. The maximum inclination angle is limited by the screw plug, and the minimum inclination angle is positioned by the baffle. The size of the inclination angle is adjusted by the hydraulic pump regulator according to the external command signal.
