Patent ID: 8851578
Filing Date: 2014-10-07
Classification: B60T,F04C

Abstract:
1. A rotary pump device comprising: a housing having a cylindrical recessed portion; a pump body inserted into the cylindrical recessed portion and having; an electric motor attached to the housing and for rotating the driving shaft; a first axial space formed in the cylindrical recessed portion of the housing and defined by a bottom surface of the cylindrical recessed portion and an axial forward end surface of the first pump casing that faces the bottom surface, wherein the first outlet port is opened to the first axial space so that discharge pressure of the working fluid from the first rotary pump is applied to the first axial space to press the axial forward end surface of the first pump casing toward the second pump casing; and a second axial space formed in the cylindrical recessed portion of the housing and defined by an axial backward end surface of the first pump casing and an axial forward end surface of the second pump casing that faces the axial backward end surface of the first pump casing, wherein the second outlet port is opened to the second axial space so that discharge pressure of the working fluid from the second rotary pump is applied to the second axial space to press the axial backward end surface of the first pump casing toward the bottom surface of the cylindrical recessed portion.