Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-10-16
2000-06-20
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310 67R, 310239, 417542, 417273, 417271, 417360, H02K 500
Patent
active
060781181
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electric motor which includes a housing that is open on one side, and a motor shaft is arranged in the axis of symmetry of the housing, and a pump which is accommodated in a housing that extends in a radial direction related to the motor shaft, and ducts for guiding pump pistons are provided in the housing.
German patent application No. 43 158 26 discloses an assembly of this type wherein the pump housing has a first base surface close to the electric motor and a second base surface remote from the electric motor which each extend in a radial direction in relation to the motor shaft. To provide the motor and pump assembly, the electric motor housing with its open side is mounted on the pump housing and connected on the base side to the pump housing.
The pump housing projects in a radial direction beyond the periphery of the electric motor housing.
Therefore, an object of the present invention is to provide an easy-to-assemble electric motor and pump assembly which, in addition, has a minimum possible radial extension.
SUMMARY OF THE INVENTION
To achieve this object, the present invention proposes extending the wall portion of a bowl-shaped electric motor housing in an axial direction so that it embraces the pump housing on the outside periphery.
In this arrangement, the axes of the ducts guiding the pump pistons will be located within the electric motor housing.
In addition, the advantage of the present arrangement is that the pump ducts which open into the side wall of the pump housing need not be closed in a sophisticated fashion. Mounting a plug which is retained by the bowl wall of the electric motor housing is sufficient.
A central aperture is provided in the pump housing into which the pump ducts open, and an eccentrically designed portion of the motor shaft is disposed within the aperture.
The electric motor housing is usually made of metal because it must ensure the magnetic return path of the magnetic fields of the permanent magnets of the stator.
Because the electric motor housing embraces the pump housing and imparts sufficient stability to the pump housing, the pump housing may be made of plastic material.
Further, making the pump housing of plastic material provides the advantageous possibility of mounting the brushes of the electric motor on the first base surface, with the result that the pump housing additionally performs the function of a brush support plate.
In addition, conductor paths may be cast in the pump housing by way of which the current is conducted to the brushes.
Connecting pins project from the second base surface of the pump housing and include connecting ducts which open vertically into the pump ducts. The connecting pins are inserted into an aluminum valve housing. The aluminum housing houses ducts which, among others, accommodate the suction and pressure valves of the pumps.
The present invention will be explained in the following by way of three Figures.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings,
FIG. 1 is a cross-sectional view of a first embodiment of the assembly.
FIG. 2 is a cross-sectional view of a second embodiment of the assembly.
FIG. 3 is a cross-sectional view of the first embodiment of the assembly twisted by 90.degree. in relation to the cross-sectional view of FIG. 1.
FIG. 4 is a perspective view of a valve block.
First of all, the embodiment of FIG. 1 is referred to.
DETAILED DESCRIPTION OF THE DRAWINGS
The electric motor 1 is a direct-current commutator motor. Its housing 2 is a deep-drawn sheet-metal bowl which is open on one side. Provided in the bottom of the housing is a first point of support 3 for a motor shaft 4 which extends in the axis of symmetry of the housing 2. The motor shaft 4 carries an armature 5, a collector 6 and an eccentric 7 which is pressed onto the smoothly abraded shaft 4. Permanent magnets 8 are attached or cemented to the inner side of the housing wall and induce a rotation of the shaft 4 in interaction with the energized armature 5.
The permanent m
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Dinkel Dieter
Reinartz Hans-Dieter
Ghahramani Saeed
ITT Manufacturing Enterprises Inc.
Ramirez Nestor
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