A plunger return device for crankshaft connecting rod radial piston pump

Abstract

The invention relates to a plunger returning device for a bent axle connecting rod type radial plunger pump. The plunger returning device forms an integrated mechanism through a plunger, a pin shaft,a shaft pad and two lantern rings. Motion track of an eccentric cam is transmitted to the plunger when a transmission shaft with an eccentric cam rotates, and motion and an automatic returning function of the plunger are realized. The plunger is pressed on an eccentric circle of a bent axle, the two lantern rings sleeve the end part of the pin shaft of the plunger, and thus the pin shaft is connected with an outer ring of a bearing. According to the plunger returning device for the bent axle connecting rod type radial plunger pump, the advantages of small rotational inertia and a good transmission performance of the bent axle connecting rod type radial plunger pump are fully utilized, and the problems that a transmission spring returning device is complex in structure and a spring is proneto fatigue attenuation are further solved.

Description

technical field [0001] The invention belongs to the structural field of radial plunger pumps, and relates to a plunger return device for crankshaft connecting rod type radial plunger pumps. Background technique [0002] The radial piston pump is a device that provides power in the hydraulic system. It relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil absorption and oil pressure. Commonly used radial piston pumps can be divided into cylinder rotary type and crankshaft connecting rod type according to the structure of the transmission system. The cylinder-rotating structure has a large moment of inertia due to the rotation of the cylinder body driven by the transmission shaft, and there is a relatively fast relative sliding between the plunger head and the inner wall of the housing, the pv value of the friction pair is high, and the wear problem is serious; the crankshaft The connecting rod st...

AI Technical Summary

Problems solved by technology

The cylinder-rotating structure has a large moment of inertia due to the rotation of the cylinder body driven by the transmission shaft, and there is a relatively fast relative sliding between the plunger head and the inner wall of the housing, the pv value of the friction pair is high, and the wear problem is serious; the crankshaft The connecting rod structure cylinder does not rotate with the transmission shaft, which reduces the moment of inertia of the pump. However, because the cylinder is stationary and the plunger chamber is located outside the plunger, it cannot be returned by the centrifugal force generated by the rotation, as in the cylinder rotation structure. The return of the plug needs to rely on the spring as the return device, which increases the size and complexity of the pump structure, and the elastic parts are frequently compressed during work, which is prone to fatigue damage and affects the service life of the pump

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