Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-07-10
1998-04-21
Laballe, Clayton E.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 91, H02K 504, H02K 522
Patent
active
057421099
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention pertains to an electric motor, a pump and also to a motor-pump assembly.
BACKGROUND OF THE INVENTION
An electric motor of this kind is described in German application No. DE-OS 4,235,962. It is used in particular to drive an axially flanged hydraulic pump. The hydraulic pump is located in a housing that features a flat flanged side. Accordingly, the outer side of the plate is of flat design, so that during assembly of electric motor and pump, the upper housing and the plate rest flush against each other. In this case, the pot-shaped housing runs up to the flanged surface of the pump housing. The electric motor housing consists of a magnetically conductive material that serves to contain the magnetic field lines of the permanent magnets located in the motor.
The invention solves the problem of obtaining the shortest possible size of the motor housing, which consists of magnetically conductive material, with respect to the length of the rotor. Therefore it is proposed that the plate consists of a flat base plate, in whose center there is a passage for the shaft, and an edge region that slants outward from the base plate and at whose outer edge the perimeter collar is formed, whereby, when the plate is connected with the housing, viewed in the axial direction, the base plate is located in front of the edge of the pot-shaped housing.
From the DE-OS 4,235,962 we also know that the brushes which contact the commutator of the electric motor are located on the inside of the plate. Continuing the idea of the invention, it is proposed that the diameter of the base plate be somewhat larger than the region in the radial direction filled by the brushes. Thus the brushes can be located on the base plate. At the outside of the base plate there is a mount consisting preferably of a perimeter span that protrudes axially from the outer surface of the base plate, with the span enclosing an inner diameter corresponding to the outer diameter of the main bearing. In another embodiment of the electric motor, the plate can likewise be provided with a perimeter span whose outer diameter corresponds to a hole that corresponds to the diameter of a receiving hole in the pump housing.
Both methods make it possible to attach the plate, and thus the motor housing, to the flanged surface of the pump housing radially.
The electric motor described above is provided in particular for a pump housing which is described in WO94/08830. This pump housing consists of an essentially rectangular block that features a blind hole opening into a flanged surface into which the shaft of an electric motor can be inserted. In a middle plane perpendicular to the receiving hole there are other holes for pump pistons, and housing channels run in planes above and below the middle plane; said channels lead to valves, connectors and/or reservoirs situated in these planes.
The height of the block, that is, its size in an axial direction relative to the receiving hole, is determined by the diameter of the hole for the pump piston, and also the installation space for the connections, the reservoir and valves. The object is to keep the installation height of the block as small as possible and in particular, to keep the installation height of the system, consisting of the block and the electric motor attached with a flange, as small as possible. Therefore it is proposed that the flanged side be provided with a flat recess that is concentric to the receiving hole, where the diameter of the base surface of the recess is smaller than the diameter of the housing of the electric motor being attached with a flange.
On one hand, this recess results in less material being used for the pump block, and on the other hand, at least partial regions of the electric motor can penetrate into the rectangular contour of the block, so that the overall height of the pump housing and electric motor housing will be as small as possible.
Preferably the transition region between the base surface of the recess and the flanged surface of the pump housing is
REFERENCES:
patent: 3408942 (1968-11-01), Davenport et al.
patent: 3484934 (1969-12-01), Wightman
patent: 4900967 (1990-02-01), Amano et al.
patent: 5263825 (1993-11-01), Doolin
patent: 5325736 (1994-07-01), Tsujita
Dinkel Dieter
Reinartz Hans-Dieter
Volz Peter
ITT Automotive Europe GmbH
LaBalle Clayton E.
Lewis J. Gordon
Twomey Thomas N.
LandOfFree
Electric motor, pump and an electric motor/pump system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric motor, pump and an electric motor/pump system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric motor, pump and an electric motor/pump system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2060788