Secondary air pump driven by brushless motor

Abstract

The invention discloses a secondary air pump driven by a brushless motor. The secondary air pump comprises a pump shell, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are fixed on the upper end part and the lower end part of the pump shell respectively, thus the pump shell forms a closed space, the pump shell is sequentially divided into an impeller chamber, a brushless motor bearing chamber and a controller mounting chamber from top to bottom, an isolation subplate is arranged between the brushless motor bearing chamber and the controller mountingchamber, an air inlet pipe is arranged on the front end cover, the front end cover is provided with a raised annular air flow channel, the annular air flow channel is connected with the air inlet pipeline, the impeller chamber is positioned directly below the annular air flow channel, an impeller body is arranged in the impeller chamber, and a brushless motor structure is arranged in a brushless motor bearing chamber. The air pump has compact structure and reasonable design, can realize the effect of bearing the brushless motor, realizes the effects of low noise, high power density and elimination of friction resistance of an electric brush, has good sealing effect, is convenient to assemble and has good application prospect.

Description

technical field [0001] The invention relates to the technical field of automobile exhaust treatment, in particular to a secondary air pump driven by a brushless motor. Background technique [0002] Since the implementation of the world's automobile exhaust pollution control standards, the secondary air injection system has been widely used in automobiles. The secondary air injection system is actually a practical technology for exhaust emission control, which is used to reduce the emission of HC and CO in the exhaust. The function of the secondary air injection (Air Injection, AI) system: under certain working conditions, a certain amount of fresh air is sent into the exhaust pipe (to promote the further oxidation of CO and HC in the exhaust gas from the engine), thereby reducing the amount of air in the exhaust gas of the vehicle. The emission of harmful substances; under the starting condition, the secondary air injection system can also accelerate the heating of the thre...

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Problems solved by technology

Moreover, the current brushless motor structure is not suitable for the use of the current secondary air pump structure driven by the brush motor. The existing secondary air pump structure driven by the brush motor has poor sealing effect and large volume. There are many parts, it is not convenient for rapid assembly and molding, and the production efficiency is low. Moreover, there are easy installation size deviations during the assembly process, and the pass rate is not high.

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