Opposed piston pump

Abstract

The invention relates to a piston pump, in particular to an opposed piston pump applied to engineering machinery. The opposed piston pump comprises supporting seats, a crankshaft, a first linkage, a second linkage, a first cylinder body and a second cylinder body. Both ends of the crankshaft are supported by the supporting seats; the first cylinder body and the second cylinder body are oppositely arranged at both sides of the crankshaft and each of the first cylinder body and the second cylinder body is provided with a cylinder body shell, oil inlet and outlet holes and inner and outer pistons reciprocating in the cylinder body shell; the first cylinder body corresponds to the first linkage; the second cylinder body corresponds to the second linkage; each of both the linkages comprises an inner connecting rod and an outer connecting rod; one end of each inner connecting rod is hinged to the corresponding inner piston and the other end of the inner connecting rod is hinged to a crankshaft journal; one end of each outer connecting rod is hinged to the corresponding outer piston and the other end of the outer connecting rod is hinged to a crankshaft journal; and the crankshaft journal hinged to the inner connecting rods and the crankshaft journal hinged to the outer connecting rods are deviated from the rotating center of the crankshaft towards the opposite directions. The opposed piston pump disclosed by the invention has large discharge capacity, high efficiency, a large pressure and a simple and compact structure.

Description

technical field [0001] The invention relates to a piston pump, in particular to an opposed piston pump applied to engineering machinery. Background technique [0002] Due to the characteristics of harsh working conditions, heavy load, large speed change range, and multi-system action of construction machinery, axial piston pumps with the advantages of high pressure, high speed, small volume and convenient variable control have been widely used in construction machinery. . However, the axial piston pump still has the following problems: the axial piston pump controls the displacement of the pump by adjusting the inclination angle of the swash plate. The larger the inclination angle, the greater the displacement, but at the same time, the greater the radial component force , which directly affects the strength and stiffness of the plunger cylinder; the spring at the bottom of the plunger restricts the return movement of the plunger, thereby reducing the effective length of th...

AI Technical Summary

Problems solved by technology

However, the axial piston pump still has the following problems: the axial piston pump controls the displacement of the pump by adjusting the inclination angle of the swash plate. The larger the inclination angle, the greater the displacement, but at the same time, the greater the radial component force , which directly affects the strength and stiffness of the plunger cylinder; the spring at the bottom of the plunger restricts the return movement of the plunger, thereby reducing the effective length of the plunger and making the space of the plunger not fully utilized; the ball hinge at the plunger ball head is lubricated by The hollow structure of the plunger and the part of the ball head that has been milled off, and the small damping hole on the sliding shoe, these two structures weaken the sealing performance between the plunger and the swash plate, thereby limiting the increase of the pressure of the entire pump; The oil is controlled by the valve plate. When the pump is turned on and off and when the oil is switched in and out, the instantaneous acceleration of the valve plate will be generated, which will affect the force on the valve plate and thus affect its service life.

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