The invention discloses an inlet pressurizing type two-dimensional duplex
piston pump comprising a pump body. The pump body is provided with an oil suction opening and an oil
discharge opening. A pumpunit is arranged in the pump body and comprises two cylinder blocks fixed into the pump body. The two cylinder blocks are arranged in the left-right direction. Pistons are both arranged in the two cylinder blocks, and the two pistons are in mutual linkage. The center axis of each
cylinder block coincides with the center axis of the corresponding
piston. The two ends of each
piston are both provided with moving components, wherein the moving components drive the piston to axially move so as to cause the volume of a work cavity to change. The piston motion driving directions of the two moving components at the two ends of each piston are opposite. Each piston, the corresponding
cylinder block and the moving components on the two sides of the piston constitute one half part of the duplex structure of the
piston pump, the part close to a front end cover is the upper half part of the duplex structure of the
piston pump, and the part close to a back end cover is the
lower half part of the duplex structure of the
piston pump. According to the inlet pressurizing type two-dimensional duplex piston pump, the double-freedom-
degree structure of rotation and sliding of the pistons is used forreplacing an oil distributing disk structure of a traditional circumferential
plunger pump, and continuous oil suction and
discharge functions are achieved; besides, the duplex mode is adopted, if thepistons rotate for one circle,
reciprocating motion is conducted four times, oil suction and oil
discharge are each conducted eight times, and the number of times of oil suction and the number of times of oil discharge are each four larger than those of a monoblock piston pump.