Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-09-05
1999-04-13
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310 88, 41742311, H02K 510
Patent
active
058941800
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention pertains to an electric motors and more particularly to vents used to vent motor housings.
BACKGROUND OF THE INVENTION
One example of such an electric motor is described in DE 4,235,962 A1. The invention aims to provide pressure compensation between the interior of the motor housing and the external air in a motor of this type. In this case, it must be taken into account that the motor is used in a vehicle and the motor is subjected to extreme external vibration.
It is known to realize the aforementioned pressure compensation by means of BTFE membranes that are arranged in a connecting channel between the interior of the motor housing and the external air. One example of such an arrangement is described in EP 600,271 A1. The arrangement proposed in this document, however, is not suited to the designated field of application. It should be possible to mount the membranes relatively easily and prevent the membrane from being removed during the operation of the motor due to external influences.
BRIEF DESCRIPTION OF THE DRAWINGS
Each figure shows a cross section through an electric motor/pump unit, with the embodiments shown differing with respect to the arrangement of the ventilation membrane.
FIG. 1 is a cross-sectional view of a first embodiment of the motor of the present invention having a membrane integrally incorporated into the shield.
FIG. 2 is a cross-sectional view of a second embodiment of the motor of the present invention having a membrane bonded onto an inner surface of a collar.
FIG. 3 is a cross-sectional view of a third embodiment of the motor of the present invention wherein a membrane is arranged on a plate.
FIG. 4 is a cross-section view of a fourth embodiment of the motor of the present invention wherein a membrane is sprayed onto a plate.
FIG. 5 is a cross-section view of a fifth embodiment of the motor of the present invention wherein a shield serves as an element for securing a membrane.
FIG. 6 is a cross-section view of a sixth embodiment of the motor of the present invention wherein a membrane is disposed in a central region of the base of the motor housing.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The basic design of the motor/pump unit is identical in all figures, i.e., the explicit description of FIG. 1 analogously applies to the following figures.
The electric motor 1 consists of a pot-shaped housing 2, into the open end of which a shield 3 is inserted. A motor shaft 5 is arranged in the axis of the housing 2 and extends out of the electric motor 1 through the shield 3. Magnets 14 are bonded onto the inner side of the housing. The electric motor 1 is connected to a pump 4. The housing 6 of the pump 4 consists of an aluminum block, with bearings 7, 8 that carry the motor shaft 5 arranged in said aluminum block. The pistons of the pump which adjoin a cam region 9 of the motor shaft 5 are not shown in the figures. Electromagnetic valves arranged in the pump housing 6 for controlling the essential that the pump housing 6 has a flat flange surface 10. The electric motor 1 is fastened to the side of the pump housing 6 which comprises the flange surface, i.e., the shield 3 adjoins the flange surface 10. The electric motor is attached by means of screws 11 that extend through openings 12 in a radially outward directed collar 13 on the housing 2 of the electric motor and are screwed into threaded bores in the pump housing 6.
In order to prevent the admission of moisture into the interior of the motor housing as well as the bearing region of the motor shaft, a circumferential seal 15 is arranged between the shield 3 and the edge of the pot-shaped housing 2. The figures show the unstressed condition of the seal 15. In this case, one can ascertain that the seal protrudes beyond the shield 3, i.e., the seal is pressed against the flange surface 10 during the assembly of the electric motor 1 and the pump 4. The previously described sealing function is reliably attained in this fashion.
It was already explained above that it is necessary to form a
REFERENCES:
English translation of the International Preliminary Examination Report of Application No. PCT/EP95/04979 filed Dec. 15, 1995.
German Patent Application No. G 90 00 324.1 dated Jun. 20, 1991.
German Patent Application No. G 91 07 992.6 dated Mar. 12, 1992.
German Search Report for Application No. P44 44 643.8 dated Jul. 10, 1995.
Dinkel Dieter
Reinartz Hans-Dieter
Volz Peter
ITT Manufacturing Enterprises Inc.
Lewis J. Gordon
Mullins B.
Ramirez Nestor
Twomey Thomas N.
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