Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-08-20
1998-09-01
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 310 43, H02K 516, H02K 515
Patent
active
058014675
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention pertains to an electric motor for a drive mechanism, in particular, a pump, with a shaft that is located in the motor housing and runs through a circular, central opening in a plate. An outer edge of the plate forms a guide for the motor housing. The plate features a radially aligned contact surface which establishes a positive connection in the radial direction between the plate and the housing of the drive mechanism.
An electric motor of this type has been disclosed in DE-OS 4,235,962. The electric motor is arranged on a flat, flanged surface of a pump housing. The motor shaft is supported by at least one bearing located in the pump housing. Thus, the motor shaft is aligned with respect to the pump housing. It is now possible to align the motor housing such that it is centered about the motor shaft. To accomplish this, the motor has a plate that fits flush against the pump housing and at its outer edge forms a guide for the motor housing. The above-mentioned bearing extends across part of the length of the pump housing, so that the support plate, which features a corresponding, central recess, can be plugged into the protruding bearing. Thus, the plate and the housing supported by the plate are centrally aligned with respect to the motor shaft.
This arrangement has the additional advantage that the housing, shaft, plate and bearing are initially combined into a single structural unit. This structural unit can be checked for proper functional integrity since the motor shaft is seated in the vicinity of the plate. Next, the structural unit is placed on the pump housing, and the bearing assumes its position in the pump housing and is thus in a position to transfer the radial forces occurring on the motor shaft during operation of the motor-driven pump unit, to the pump housing.
However, this configuration has the one particular disadvantage that the bearing protruding from the plate can be easily damaged during transport. The purpose of the invention is to create an arrangement where the bearing is protected against damage, but at the same time will ensure that the motor housing can be radially aligned with respect to the motor shaft and that the motor can be tested as a stand-alone structural unit.
SUMMARY OF THE INVENTION
In this case, it is proposed that an electric motor like that described above be refined in the following ways. The diameter of the opening is adapted to the diameter of the motor shaft so that the inner surface of the opening will serve as a bearing for the shaft; in addition, a contact surface is formed at the outer edge of a protrusion of the plate.
This protrusion is preferably coaxially aligned with respect to the opening and is in the shape of a ring whose outer surface forms the contact surface and whose inner surface moves as the bearing surface in contact with the motor shaft.
This structure allows the main bearing to be installed in the drive mechanism housing and allows the electric motor structural unit to be assembled without this bearing. The surface at the inner edge of the plate designed as a slide bearing is sufficient to seat the motor shaft for a trial run.
Thus, the main bearing can be installed in the pump housing independent of the motor and be secured against damage there.
The pump housing features corresponding recesses, in which the protrusion of the plate can be inserted, so that the motor housing and the plate can be secured in the radial direction with respect to one another.
Preferably, the front surface of the protrusion has contact surfaces at least in partial regions which will move along the pump housing after assembly of the electric motor to make contact with the outer ring of the main bearing and lock it in place in the axial direction in the pump housing.
In addition, the diameter of the protrusion corresponds to the outer diameter of the bearing, so that a blind hole with a constant diameter can be provided in the pump housing for the bearing and for the protrusion.
The plate can also be designed as a bru
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Dinkel Dieter
Reinartz Hans-Dieter
Volz Peter
ITT Automotive Europe GmbH
Jones Judson H.
Lewis J. Gordon
Stephan Steven L.
Twomey Thomas N.
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