Electric pump
a positive displacement type, motor integrated technology, applied in the direction of pump components, liquid fuel engines, rotary piston liquid engines, etc., can solve the problems of deterioration of sealing performance, lowering of the accuracy of the mating surface of the both sides of the pump chamber, etc., to suppress the deterioration of pump efficiency and the increase of partial abrasion, and maintain the close contact state.
Inactive Publication Date: 2018-06-14
MAHLE FILTER SYST JAPAN CORP
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- Description
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Benefits of technology
The present invention provides a motor integrated type electric pump with improved accuracy of mating surfaces and sealing performance. This helps to prevent secondary troubles such as pumping efficiency deterioration, partial abrasion of sliding parts, and increase of frictional resistance. Additionally, the housing is divided into two parts in the axial direction of the rotor and is configured of a housing body and a cover member, which holds the outer rotor, inner rotor, and pair of side plates in close contact with each other. This ensures stable maintenance of close contact state and further suppresses the deterioration of pump efficiency and the increase of frictional resistance at sliding parts.
Problems solved by technology
In this structure, it is difficult that the housing members, the outer rotor and the inner rotor are accurately brought into close contact with each other by the fastening force of the bolts unless the housing members are made thick to have high rigidity, and there are therefore concerns that the accuracy of the mating surfaces of the both side surfaces of the pump chamber is lowered and its sealing performance also deteriorates.
Method used
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Embodiment Construction
[0016]FIG. 1 to FIG. 3 show a specific first embodiment for implementing an electric pump according to the present invention. In particular, FIG. 1 shows a sectional view taken along a line B-B of FIG. 2 as the entire sectional view of an electric pump 1, and FIG. 2 shows a sectional view taken along a ling A-A of FIG. 1. In addition, FIG. 3 shows a perspective exploded view when a cover 4 of the electric pump 1 shown in FIG. 1 and FIG. 2 is removed.
[0017]The electric pump 1 shown in FIG. 1 to FIG. 3 is one in which an electric motor 5 and a pump part 8 mentioned below are accommodated and concentrically disposed in a circular hosing 2 sealed by a hosing body 3 and the cover 4 such that their axial center direction positions match with each other. In addition, the entire shape of the electric pump 1 including the housing 2 is formed in a substantially flat shape.
[0018]As shown in FIG. 1 and FIG. 2, the electric motor 5 is configured of a annular stator 6 occupying the outer circumfe...
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An electric pump includes a housing 2 configured of a housing body 3 and a cover 4, a stator 6 having a plurality of coils 15, a rotor 7 configured of an inner side outer rotor 16 and an outer side rotor body 17, a pump part 8 disposed on the inner circumferential side of the rotor 7 of an electric motor 5, side plates 11 and 12 disposed on both side surfaces of the rotor 7, an inner rotor 9, and a plurality of connecting plates 10 interposed between the outer rotor 16 and the inner rotor 9. The side plate 12 of the side plates 11 and 12 is pressed to the rotor 7 by a compression coil spring 28.
Description
BACKGROUND OF THE INVENTION[0001]The present invention relates to a motor integrated type and also positive displacement type pump in which an electric motor and a pump part are integrated.[0002]In Japanese Patent Application Publication No. 2011-74843 (hereinafter is referred to as “JP 2011-74843”), Japanese Patent Application Publication No. 2012-67735 (hereinafter is referred to as “JP 2012-67735”) and Japanese Patent Application Publication No. 2012-41867 (hereinafter is referred to as “JP 2012-41867”), as a motor integrated type electric pump which is used for an oil pump for an engine and a transmission for a vehicle, for example, an electric motor has been suggested in which a pump part is disposed on the inner circumferential side of a rotor of the electric motor.[0003]The motor integrated type electric pump disclosed in JP 2011-74843, JP 2012-67735 and JP 2012-41867 has a structure in which the rotor of the electric motor also serves as the outer rotor of the pump part of t...
Claims
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IPC IPC(8): F04C15/00F04C2/46
CPCF04C15/0034F04C2/46F04C15/008F04C2240/20F04C2240/40F04C2240/50F04C2240/30F04C2/3447F04C15/00F04C2/332
Inventor HORIMATSU, TOSHINOBUMASUKURA, SATOSHIMORISHITA, NAOTO
Owner MAHLE FILTER SYST JAPAN CORP