Return stroke mechanism and tilting tray type plunger pump or motor including structure

Abstract

The invention discloses a return stroke mechanism and a tilting tray type plunger pump or motor including the structure. The return stroke mechanism is of an independent separation type structure andcomprises a pre-tightening assembly and a constraint assembly, the constraint assembly comprises a tilting tray, a sliding tray supported on the tilting tray and a constraint device, the sliding trayis of a whole structure, the end face, opposite to the tilting tray, of the sliding ray is provided with a static pressure bearing face, the static pressure bearing face is supported on the tilting tray and is kept sliding fit with the tilting tray, a third bearing is clamped between the sliding tray and the tilting tray, and the constraint device limits moving of the sliding tray way from the endface of the tilting tray in a manner of constraining the outward moving of a third bearing. Through separating and independent structural design of the pretightening assembly and the constraint assembly, unbalanced force or moment of a cylinder body, piston shoes and a return stroke tray is free of interaction effect, the tiling phenomenon of the cylinder body, the sliding tray oil film distribution imbalance and noise are greatly reduced, work reliability of the tilting tray type plunger pump or motor can be effectively improved, and the work service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of hydraulic transmission and control, in particular to a return mechanism and a swash plate type plunger pump or motor including the structure. Background technique [0002] Axial piston pumps and motors are one of the most widely used hydraulic components in modern hydraulic transmissions. Among them, axial piston pumps are the most widely used and ideal pumps for high pressure, high speed and large flow. structure. This type of pump mainly changes the sealing working volume through the reciprocating movement of the plunger in the cylinder hole, so as to achieve the purpose of oil suction and discharge. In the existing axial piston pump structure, the return mechanism is an indispensable and important part, and it is a necessary condition for the normal operation of the pump. sports. [0003] The methods for returning the plunger in the prior art include using an auxiliary pump to supply oil to make the...

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Problems solved by technology

However, this return method also has its disadvantages: first, since only one central spring is used, the rigidity of the central spring is required to be relatively large, which brings difficulties to design and installation; second, due to the initial The pre-tightening force required for sealing is often different, and the central spring can only provide a constant pre-tightening force; third, during the working process of the pump, since the cylinder block, sliding shoe, and return plate are periodic moving parts, and There is an unbalanced force or moment, and this unbalanced force or moment affects each other through the return mechanism and the plunger, especially when the rotation speed is high, it intensifies the overturning phenomenon of the cylinder block, the uneven distribution of the oil film of the sliding shoe and the noise

The fixed-gap forced return method requires high processing and installation precision; it is very important to keep the gap at a reasonable value. If the gap is too large, not only will there be loud noises, but also the phenomenon of back suction will occur when the oil return pressure of the shell is high, so The heat of the pump cannot be dissipated, the temperature is very high, and the pump will burn out soon; if the clearance is too small, the sliding shoe and the return plate will be severely worn and the pump will fail prematurely; It is difficult to ensure a constant gap after work wear, so the reliability of this structure cannot be guaranteed for a long time, and it is rarely used at present

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