Double swing spherical piston electric vacuum pump

Abstract

The invention relates to a novel double-swing spherical piston-type electric vacuum pump for automobiles. The vacuum pump includes a pump body, a motor, an eccentric shaft, two spherical pistons, two intake valves, a muffler and a gas pipe joint. The pump body is The special-shaped structure is made of aluminum alloy die-casting. It includes two cylinders with an appropriate distance. The outer ends of the two cylinders are respectively provided with end caps to block the outer ends of the inner holes of the cylinders. There are through holes in the pump body. There is a suitable distance between the inner ends of the two cylinders, a balance weight is arranged on the eccentric shaft, and a one-way valve is arranged on the muffler. The invention has the advantages of simple structure, good sealing performance, low noise, small vibration, long continuous working time and good low-temperature performance, and can meet the environmental requirements and ride comfort requirements of automobiles.

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

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