Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-01-29
1994-03-01
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 71, H02K 510
Patent
active
052910881
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electric motor having a watertight construction having an insulated lead-insert disposed between an end face of a motor housing and an axially protruding bearing plate.
In European Patent No EP-B1-0 221 304, an electric motor is described having a brush yoke with an integrally molded connector which housing radially projects beyond the opening of the motor housing. The molded connector is pushed, with a snug fit, into an axial longitudinal slot, which is open at the end face, of the motor housing. The molded connector can be fixed in its end operating position by placing the bearing plate against it. Openings are provided in the part of the connector housing projecting through the motor housing, through which the electrical leads run from outside to the brush arrangement which is arranged inside the motor housing. For sealing the electric motor, a compressible seal is interposed as a separate part in between the motor housing and the leads running to the outside of the motor housing.
In European Patent No. EP-A-0 219 681, an assembly unit, including a brush holder and a seal, can be prefabricated so that the seal is joined to the brush holder during preassembly by clamping, interlocking, bonding or welding. To avoid an undefined compression or lateral pushing away of the seal, buffers are provided on the end faces which press the seal together and are thereby mutually sealed. These buffers abut axially in front of one another with mutual bracing. The seal is disk-shaped and is provided with slot-shaped fitting openings in its circumferential direction. Guide lugs are formed onto the end faces and axially engage the slot-shaped fitting openings when the components to be sealed off are braced with the seal lying in between.
SUMMARY OF THE INVENTION
The expenditure for design and, in particular, assembly required to produce a moisture-proof sealed electric motor, in particular a commutator motor having a brush plate arranged in the vicinity of one bearing plate of the electric motor, can be substantially reduced by integrally molding the leads in an insulated lead-insert made of an insulating material. A circumferential sealing ring is molded on the insulated lead-insert in such a way that it can be pressed directly by the bearing plate or indirectly via the insulating material lead-insert against the end face of the motor housing to form a seal. As a result, with a molded or injection-molded part that can be produced as an individual component and can be assembled in a single operation, it is possible to run the leads out of the motor housing, in a sealed manner, and to seal the motor housing off by placing the bearing plate against it at the end face. This results in a low expenditure while maintaining the seal.
A further simplification of the assembly resulting from a reduction in the number of components to be individually assembled and an accompanying reduction in the number of assembly steps can be achieved according to a development of the invention by securing the insulated lead-insert on the brush plate. The sealing ring can be pre-positioned by placing it tangentially around the insulated lead-insert by securing the sealing ring to the brush plate with securing bars. The insulated lead-insert and the sealing ring, with its securing bars, are expediently and directly injection-molded onto the brush plate. As a result, the brush plate serves as a carrying component for the insulated lead-insert, with its injection-molded leads, and the entire sealing ring, which is already held in such a position that it reaches its sealing end operating position without additional manipulation measures when the motor housing and bearing plate are assembled.
According to a further development of the invention, an annular groove is provided in the bearing plate which extends over the periphery and is matched to the profile of the sealing ring and is an additional fixing aid for insertion fixing of the sealing ring. The annular groove is designed in such a way
REFERENCES:
patent: 3308316 (1967-03-01), Pfahl
patent: 3455174 (1969-07-01), Pickles
patent: 3535564 (1970-10-01), Anastasia et al.
patent: 4387313 (1983-06-01), Yamamoto et al.
patent: 4713568 (1987-12-01), Adam et al.
patent: 4727274 (1988-02-01), Adam et al.
Patent Abstracts of Japan, vol. 8, No. 194, Sep. 6, 1984, & JP-A-59 83553, May 15, 1984.
Patent Abstracts of Japan, vol. 5, No. 129 Aug. 19, 1981, & JP-A-56 66153, Jun. 4, 1981.
Adam Peter
Hofmann Manfred
Muller Hans-Joachim
Seuffert Werner
Nguyen Matthew
Siemens Aktiengesellschaft
Skudy R.
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