Electric vacuum pump

Abstract

In an electric vacuum pump, a pump housing and a lower-end cover member respectively include positioning retainers respectively formed on outer peripheries of the pump housing and the lower-end cover member. A case includes positioning retainers each protruding inward from an inner peripheral surface of the case. The positioning retainers are in contact with the positioning protrusions, thereby positioning the pump housing and the lower-end cover member with respect to the case. The positioning protrusions are formed with screw holes.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from the prior Japanese Patent Applications No. 2013-040766 filed Mar. 1, 2013 and No. 2013-177796 filed Aug. 29, 2013, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a vacuum pump for generating negative pressure to be used in a brake booster of a vehicle such as a car.[0004]2. Related Art[0005]A brake device for car is provided with a brake booster for amplifying a braking force by utilizing negative pressure in an intake pipe (“intake-pipe negative pressure”) of an engine. In recent years, pumping loss is reduced in response to demands for low-fuel consumption and thus the negative pressure in the intake pipe tends to decrease. Furthermore, for a hybrid vehicle, an electric vehicle, or a vehicle with an idling stop function, there is a case where the intake...

AI Technical Summary

Benefits of technology

The electric vacuum pump described in the invention is smaller and more precise in putting together the components that make up the pump.

Problems solved by technology

Furthermore, for a hybrid vehicle, an electric vehicle, or a vehicle with an idling stop function, there is a case where the intake-pipe negative pressure of an engine could not be obtained.

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