Electromotor/pump assembly

Details Electromotor/pump assembly Electromotor/pump assembly

1999-12-17

2001-03-13

Walberg, Teresa (Department: 3742)

Pumps

Motor driven

Electric or magnetic motor

C417S273000

Reexamination Certificate

active

06200109

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an electric-motor-and-pump assembly including an electric motor having a pump-sided shaft end which extends through a housing lid, is supported with at least one roller bearing on a pump housing, and whose purpose is to drive pump pistons, wherein the housing lid in the area of the shaft passage leaves open a gap which connects a pump-sided crank chamber to an inside space of the motor.
DE-OS 43 15 826 discloses an electric-motor-and-pump assembly of this type. It may occur in operation of this assembly that a part of the pressure fluid being pumped propagates as a so-called leakage fluid into a pump-sided crank chamber and from there through a gap between the pump housing and the motor housing into the interior of the motor. The pressure fluid which inadvertently entered the area of the rotor may cause short-circuits and, thus, malfunctions of the motor.
Therefore, an object of the present invention is to protect the electric motor of an electric-motor-and-pump assembly against the inadvertent ingress of leakage fluids in an inexpensive fashion. Another object of the present invention includes minimizing the overall axial dimensions of the assembly because small-size assemblies are preferred especially in the automotive field.
SUMMARY OF THE INVENTION
This object is achieved by the provision of a sealing element which closes the gap. Due to these features, the electric motor is protected against the ingress of leakage fluids in an especially reliable and inexpensive fashion. It must be emphasized that the sealing element permits mounting in a simple manner.
In a preferred aspect of the present invention, the sealing element is mounted on the housing lid and acts upon the motor shaft in a radial direction. The particularly small overall size is advantageous in this arrangement. Also, this embodiment is easy to achieve when a silicone seal is injection-molded in the associated groove of the housing lid during manufacture.
In a variant of the present invention, the sealing element is mounted on a frontal end of the housing lid and acts upon a bearing ring in an axial direction. This embodiment necessitates low efforts in manufacture because the sealing element bears against the bearing ring which is already in finished condition when supplied. This eliminates the need for a formerly required step in manufacture.
In another embodiment, the sealing element has an annular configuration with a V-shaped cross-section and is resiliently arranged in a space between an inner bearing ring and a stop ring. This type of construction can be adapted to most different cases of application and entails minimum effort and structure.
In an additional aspect of the present invention, the sealing element on a motor-sided frontal end is mounted in a groove of the housing lid and acts upon the commutator in an axial direction. The sealing effect is boosted by the effect of the preceding gap between the housing lid and motor shaft.
In still another embodiment, the sealing element with an annular basic member is inserted into the housing lid and acts upon the commutator with a deflected conical portion in an axial direction.
Further aspects of the present inventions can be seen in the description and the drawings. The present invention will be described in detail in the following by way of embodiments shown in the Figures.


REFERENCES:
patent: 3584648 (1971-06-01), Lubos
patent: 3639085 (1972-02-01), Bertsch et al.
patent: 3658447 (1972-04-01), Bancroft
patent: 3992133 (1976-11-01), Brunner
patent: 4173437 (1979-11-01), Leka et al.
patent: 4336473 (1982-06-01), Wetters et al.
patent: 4516921 (1985-05-01), Kemp
patent: 4594056 (1986-06-01), Brunner
patent: 4634297 (1987-01-01), Schriwer
patent: 5127316 (1992-07-01), Ishiwata et al.
patent: 5167493 (1992-12-01), Kobari
patent: 5261676 (1993-11-01), Rockwood
patent: 5360322 (1994-11-01), Henein et al.
patent: 5484270 (1996-01-01), Adahan
patent: 5620311 (1997-04-01), Wetzel
patent: 5626466 (1997-05-01), Ruoff et al.
patent: 5769616 (1998-06-01), Mencarelli et al.
patent: 6071086 (2000-06-01), Thoma
patent: 9 23 589 (1951-05-01), None
patent: 23 62 795 (1975-06-01), None
patent: 24 33 045 (1976-01-01), None
patent: 26 16 437 (1977-10-01), None
patent: 37 09 495 (1987-10-01), None
patent: 37 22 988 (1989-01-01), None
patent: 39 41 442 (1990-07-01), None
patent: 42 35 962 (1994-05-01), None
patent: 44 23 531 (1995-01-01), None
patent: 44 19 927 (1995-12-01), None
patent: 44 33 970 (1996-03-01), None
patent: 0 256 389 (1988-02-01), None
patent: 02 76 623 (1988-08-01), None
patent: 0 682 398 (1995-11-01), None
patent: 93 00 513 (1993-01-01), None
Search Report of th Geman Patent Office for German Appl. No. 196 33 170.6.

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