Electric vacuum pump with two swinging spherical pistons

Abstract

The invention relates to a novel automotive electric vacuum pump with two swinging spherical pistons. The electric vacuum pump comprises a pump body, an electric motor, an eccentric shaft, the two spherical pistons, two air inlet valves, a silencer and an air pipe connector, wherein the pump body is of a special-shaped structure, is formed by die-casting aluminum alloy and comprises two cylinders, a proper distance is reserved between the two cylinders, and an end cover for sealing the outer end of an inner hole of each cylinder is arranged at one end of the outer side of the corresponding cylinder. A through hole is formed in the pump body, the proper distance is reserved between one end of the inner side of one cylinder and one end of the inner side of the other cylinder, a balancing block is arranged on the eccentric shaft, and a check valve is arranged on the silencer. The electric vacuum pump with the two swinging spherical pistons is simple in structure, good in sealing performance and low-temperature performance, low in noise, small in vibration, long in continuous working time, and capable of meeting environmental requirements and riding comfort requirements when the automobiles are used.

Description

technical field [0001] The invention relates to an electric vacuum pump for automobiles, in particular to a double-oscillating spherical piston type electric vacuum pump. Background technique [0002] Automobile brake boosters use vacuum as their working power source, and generally the vacuum source is provided by the engine or vacuum pump (mechanical or electric). At present, most electric vacuum pumps used in automobiles use vane pumps, which have the disadvantages of complex structure, high noise, and short continuous working time. [0003] Electric vacuum pumps with rocking piston structure have existed in the market for many years, and have the advantages of simple structure and low cost. The piston reciprocates under the drive of the eccentric shaft, and at the same time swings at a certain angle. The distance also changes with the swing angle. A flexible piston ring is arranged on the piston. When the piston swings, the deformation of the flexible piston ring is used...

AI Technical Summary

Problems solved by technology

Piston rings made of flexible materials are less flexible in low temperature environments, so that their deformation cannot effectively change with the change of the gap value when the piston swings, resulting in a decrease in the sealing performance of the piston, which affects the performance of the pump. Moreover, its eccentricity There is an offset between the center of rotation of the shaft and its center of mass during operation. This offset will generate dynamic unbalance during high-speed operation, which will cause vibration during operation and affect the ride comfort of the car.

[0005] In the development process of electric vacuum pumps for vehicles, the traditional rocking piston vacuum pumps have been proved to be unsuitable for the use environment of vehicles, especially in low temperature environments, the sealing performance of the piston rings is reduced, resulting in the decline of the vacuum pumping ability of the vacuum pumps , unable to meet the requirements for the use of automobiles in low-temperature environments; the muffler is easy to enter water in an environment with water, which affects the reliability of the vacuum pump, and cannot meet the requirements for the use of automobiles in an environment with water. The vibration and vibration of the vacuum pump during operation The noise is also large, which affects the ride comfort of the car

Images