Eccentric connecting rod type radial variable plunger pump

Abstract

The invention discloses an eccentric connecting rod type radial variable plunger pump. According to the eccentric connecting rod type radial variable plunger pump, the displacement change of the plunger pump is controlled by using an eccentric column and a connecting rod assembly, compared with a traditional radial variable plunger pump, the eccentric connecting rod type radial variable plunger pump has the advantage that the energy loss caused by friction generated by using a sliding shoe and a stator is avoided; the displacement of the plunger pump is changed by changing the pressure of external hydraulic oil, and the compression amount and elongation of the plunger pump on a rotor core are both controlled through a plunger core, so that a reset spring does not need to be placed in the plunger pump, the structure of the plunger pump is simplified, and energy consumption in the spring deformation process is avoided; and the displacement is changed by changing the eccentric distance between the eccentric column and the rotor core, and compared with a method for changing the displacement by changing the eccentric distance between the stator and a rotor in the traditional radial variable plunger pump, so that a displacement adjusting mechanism is simpler and more compact; and a special coupling capable of adapting to eccentric distance change does not need to be used between a rotor rotating shaft and a prime mover.

Description

technical field [0001] The invention belongs to the field of variable displacement plunger pumps, in particular to an eccentric connecting rod type radial variable displacement plunger pump. Background technique [0002] Engineering work vehicles generally use hydraulic transmission systems, in which radial variable piston pumps are often used. The existing radial variable pumps change the displacement by changing the eccentricity of the rotor and the stator. Since the stator is fixed, only the position of the rotor can be changed, and the rotor continues to rotate driven by the prime mover, which makes it difficult to adjust the eccentricity. The slide shoe at the end of the plunger of the existing radial plunger pump slides inside the stator, which will generate a certain amount of frictional resistance, resulting in a decrease in efficiency, and cause the plunger to be eccentrically worn by radial force. Moreover, in the working process of the existing radial piston pum...

AI Technical Summary

Problems solved by technology

Since the stator is fixed, only the position of the rotor can be changed, and the rotor continues to rotate driven by the prime mover, which makes it difficult to adjust the eccentricity

The sliding shoe at the end of the plunger of the existing radial plunger pump slides inside the stator, which will generate a certain amount of frictional resistance, resulting in a decrease in efficiency, and cause the plunger to be eccentrically worn by radial force

Moreover, in the working process of the existing radial piston pump, the stator can only generate pressure on the plunger to retract the plunger, and the elongation of the plunger needs to rely on the return spring, which makes the existing radial piston pump It is necessary to overcome the spring force, which further leads to the reduction of mechanical efficiency.

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