Motor-and-pump assembly

Details Motor-and-pump assembly Motor-and-pump assembly

1997-08-14

1999-08-03

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

41742315, 310 67R, 310 42, H02K 714, H02K 514, F04B 1703

Patent

active

059329459

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a motor-and-pump assembly including an electric motor with a motor housing and a pump with a pump housing, and an armature shaft with an extension which reaches into a stepped bore in the pump housing where it is retained by at least one main bearing.
An assembly of this type is disclosed in German patent application No. 42 35 962, for example. The motor housing is centered with respect to the armature shaft which is retained in the pump housing by way of a main bearing as follows:
The main bearing projects slightly from a flange surface on the pump housing. A brush support plate having a centric indentation is mounted on the bearing which projects from the flange plane. The brush support plate is thereby aligned in a radial direction relative to the projecting bearing. Further, the brush support plate has a radially outward rim onto which the housing is slipped. Thus, the motor housing is centered by way of the brush support plate, which is aligned centrically on the flange surface and, consequently, by way of the main bearing which is slipped into the pump housing.
It is easily comprehensible that the brush support plate requires intricate machining. Especially the inside rim, which abuts on the bearing, and the outside rim, on which the housing is slipped, must be manufactured with accurate tolerances relative to one another.
However, the brush support plate is a component which is generally made by injection molding. The injection molding process does not permit a high degree of precision.
Thus, a basic object of the present invention is to ensure by simple means that the motor housing is exactly aligned relative to the axis of the armature shaft.


SUMMARY OF THE INVENTION

This object is achieved by a motor-and-pump assembly with a flange surface on the pump housing which includes a groove extending concentrically to the stepped bore, into which groove the motor housing with its rim can be mounted.
The present invention will be described in detail hereinbelow by way of two embodiments. Each of the embodiments is described in a Figure.


BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings,
FIG. 1 show s a cross-section through a first embodiment of a motor-and-pump assembly;
FIG. 2 shows a cross-section through a second embodiment of a motor-and-pump assembly.


DETAILED DESCRIPTION OF THE DRAWINGS

Reference numeral 1 designates a pump, reference numeral 2 designates an electric motor. Pump 1 is comprised of a housing 3, only part of which is shown in the drawing. It is important that the housing has a generally flat flange surface 4 into which a blind-end bore 5 opens. A main bearing 7 is provided in a first step 6 which directly succeeds the flange surface 4. The bearing is a ball bearing having an inner ring and an outer ring. A second step 8 follows the first step 6. Transverse bores (not shown), in which the pump pistons move, open into second step 8. The end surfaces of the pump pistons bear against an eccentric 9 arranged in the second step 8. Third step 10 is used to accommodate an auxiliary bearing 11 configured as a needle bearing.
The electric motor is generally comprised of a bowl-shaped housing 20 which, with its open side, faces the flange surface 4. An armature shaft 21 which carries an armature 22 and a collector 23, is arranged in the axis of the housing 20. Permanent magnets 24 are mounted on the inside of the housing 20. Brushes 25, attached to a support plate 26, abut on the collector 23. As is obvious to the one skilled in the art, the above components are the basic elements of a direct-current commutator motor.
The armature shaft 21 includes an extension 30 which projects into the blind-end bore 5. Extension 30 in FIG. 1 is a separate element which is coupled to the armature shaft 21 of the electric motor 2 by way of a coupling 31. The extension is designed integrally with the motor shaft in the embodiment of FIG. 2.
Extension 30 carries the above mentioned eccentric 9, against which the pump pistons (not shown) will b

REFERENCES:
patent: 1983262 (1934-12-01), Zorzi
patent: 3269322 (1966-08-01), Lotspih
patent: 3527971 (1970-09-01), Means
patent: 4336473 (1982-06-01), Wetters et al.
patent: 4847528 (1989-07-01), Eguchi et al.
patent: 4900957 (1990-02-01), Barker et al.
patent: 5015897 (1991-05-01), Inagaki et al.
English translation of the International Preliminary Examination Report of Application No. PCT/EP95/04980 filed Dec. 15, 1995.
German Patent Application No. G 86 06 067.8 dated Aug. 7, 1986.
German Patent Application No. 6802635.7.
German Search Report of the German Patent Office Relating to Parent German Patent Application No. 44 44 644.6.
German Patent Application No. G 93 20 524.4 dated Oct. 6, 1994.
German Patent Application No. 11,502 dated Jul. 14, 1966.
German Patent Application No. G 94 13 844.3 dated Dec. 8, 1994.
German Patent Application No. G 94 00 843.3 dated Sep. 7, 1992.

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