It consists of a fuel tank, a power mechanism, a reversing valve, a pressure relief valve, and a pumping mechanism. The pumping mechanism consists of an oil pump body, high and low-pressure oil outlet holes, an eccentric shaft, an eccentric bearing, a driven gear and a pair of high-pressure oil pumps, and a pumping mechanism. The low-pressure oil pump is composed of a low-pressure oil pump, and the oil pump body is suspended on the fuel tank cover. The high- and low-pressure oil outlet holes are opened on the oil pump body and are connected with the oil pressure relief valve oil passage. The eccentric shaft is longitudinally disposed of, and the upper end is pivoted at the center of the oil pump body, and the lower end is fixed. An eccentric bearing is arranged, the driven gear is fixed on the top of the eccentric shaft, and is coupled with the power mechanism. The high and low-pressure oil pumps are suspended on the oil pump body, and each has an actuating member that is in contact with the eccentric bearing, and the pump chamber of the high and low-pressure oil pump They are connected to the high and low-pressure oil outlets respectively.
Advantages: the connection between the pump oil mechanism and the power mechanism is a vertical connection, which can make full use of space to reduce the floor space, which is beneficial to operation and transportation; the pump oil form of the high and low-pressure oil pumps becomes the active form of the eccentric bearing. It has a simple structure and few parts to facilitate assembly.