Pumps – Motor driven – Electric or magnetic motor
Patent
1992-12-07
1994-07-05
Bertsch, Richard A.
Pumps
Motor driven
Electric or magnetic motor
310 89, F04B 3504
Patent
active
053262352
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electric motor connected with a pump. The housing of the pump has a cylindrical insertion recess which receives a tappet-shaped stud of the motor housing. The stud encloses the first bearing of the motor armature free from play. The recess is situated at the side of the pump and provides an aperture for the armature shaft.
Units including a pump and an electric motor are known. A specific field of use for such units is in the brake system of a motor vehicle and, especially, in the anti-locking-system for the brakes of a motor vehicle. Typically, the pump is a radial piston liquid pump which is driven by an eccentric on the driven shaft of an electric motor. According to the prior art, a motor housing made from sheet metal is used. The motor housing is equipped with an aluminium flange which receives the bearing and has to be treated accordingly. In addition, a separate carbon brush support plate is necessary.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a motor housing in which a form-fitting connection to the pump, and to the assembly of the bearing situated at the side of the pump free from play, is achieved without additional treatment of the housing. This object is achieved according to the present invention by providing, in a conventional unit including an electric motor and a pump driven by the electric motor, a particular structural relationship between the housing of the motor and the cover closing it. The bottom of the pot-shaped housing is provided with a bulge, which forms the stud receiving the first bearing and which can form-fittingly be inserted into the recess of the pump housing.
The present invention renders it possible to form a motor housing with a tappet-shaped stud as a deep drawn member. The tappet-shaped stud facilitates a form-fitting centering, without additional treatment, both outside and inside the stud. The first bearing, situated at the side of the pump, can be pressed into the inside of the tappet-shaped stud. In addition, to connect the motor with the pump, the tappet-shaped stud is form-fitted to the recess of the pump housing. The cross section of the wall in the section of the motor housing which forms the tappet-shaped stud is selected to provide the elasticity and stability which is necessary for the outer and inner centering and the safe connection as well as to fix the first bearing and the pump.
In order to ensure support of the pump housing at the motor housing outside of the tappet-shaped stud, the present invention provides, at the bottom of the pot of the housing, a ring-shaped bead concentrically surrounding the stud. The bead has integral fixing eyes arranged approximately diametrically opposite each other and the whole embossed part forms a flat flange plane for the pump housing. The pump housing is situated directly on the flange plane, which is perpendicular to the longitudinal axis of the armature. Pressure nuts are placed into the fixing eyes when assembling the motor and the pump. It is also possible to put screw threads directly in the motor housing.
The outer surface of the bottom of the pot may be recessed slightly with respect to the flange surface. A groove in the bottom of the pot makes the use of a relatively big radius possible at the transition from the bottom of the pot to the stud. The groove forms a circumferential channel, together with the part of the motor housing turned towards the pump housing and the flat flange surface, which, if necessary, can remove leakage liquid.
In a preferred embodiment of the invention, a runoff for leakage fluid is provided. During operation, the leakage fluid runs down through the space between the ends of the C-shaped legs of the ring-shaped bead. The ends of the C-shaped legs point down and the bottom of the groove and the bottom of the drain channel are preferably situated in the same vertical plane.
The configuration of the tappet-shaped stud is advantageous in facilitating removal of leakage fluid because it
REFERENCES:
patent: 3311293 (1967-03-01), Moffatt
patent: 4866322 (1989-09-01), Baumeister et al.
patent: 5124602 (1992-06-01), Nishimura et al.
patent: 5237231 (1993-08-01), Blaettner et al.
Abstract of Japanese Patent No. 57068590 Date: Apr. 1982.
Abstract of Japanese Patent No. 61023890 Date: Feb. 1986.
Bertsch Richard A.
Korytnyk Peter
Lewis J. Gordon
Seitter Robert P.
SWF Auto-Electric GmbH
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