Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1989-12-13
1992-08-18
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 71, 310 88, 310 89, H02K 710, H02K 510
Patent
active
051402076
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an electric motor, especially a wiper motor for driving a windshield wiper system in a motor vehicle.
BACKGROUND OF THE INVENTION
A known wiper motor of this kind includes a gear housing having a cover and several plug contacts, which are especially arranged substantially in parallel to the gear housing. Several of the plug contacts are fixed on the gear housing, in particular on the cover and at least one of them is connected with a motor current supply lead and is fitted in a plug housing. The plug contacts are fixed on the gear housing by means of a plastic member directly injection molded onto the metallic cover of the gear housing. The plug housing, into which two motor current supply leads are inserted, is carried by the injection molded plastic member and fixed thereto. All plug contacts of the known electric motor are to a far-reaching extent exposed to environmental influences and also to splashing water. The gear housing can also be leaky in the area in which the plug contacts are fixed on it.
SUMMARY OF THE INVENTION
The present invention provides an electric motor in which the impermeability of the gear housing and the protection against corrosion of the plug contacts are improved.
This is accomplished according to the invention by an electric motor which has a plug housing with an opening having a rim surrounding the opening. The plug contacts fixed on the gear housing reach into the plug housing through the opening in the plug housing as the plug housing rests firmly on the gear housing.
Thus in an electric motor according to the invention the plug housing rests directly against the gear housing, in particular on the cover of the gear housing. Thus the area of the gear housing in which the plug contacts are fixed on the gear housing are protected by the plug housing against direct access of splashing water. In this way, the protection against corrosion of the plug contacts is improved. A better impermeability of the gear housing is also provided. Normally the gear housing has openings in the area of the connector fixations, through which openings the various plug contacts extend into the gear housing interior or which openings serve to anchor the plastic member injection molded onto it.
The plug-in terminations of the plug contacts are advantageously positioned within an edge of the gear housing. The edge of the opening in the plug housing permits passage of the plug-in terminations of the plug contacts, so that during the assembly the plug contacts can be easily brought into the plug housing through the opening. Nevertheless the rim of the opening can without difficulty rest upon the gear housing.
The plug contacts extending into the gear housing interior are connected with sliding springs which are part of a position switch of the electric motor. Several of the plug contacts fixed on the gear housing can extend close to an edge of the gear housing into its interior. In order to prevent the plug-in terminations of the plug contacts from projecting over an edge of the gear housing these plug contacts suitably extend from the openings in the opposite direction towards the close edge of the gear housing.
The plug contacts on the electric motor are in a known manner connected with mating plugs inserted in a mating plug housing. For this mating plug housing a seat is created on the electric motor. It is also known to provide in electric plug connections between the two plug housings a sealing resting against a seat surrounding the mating plug housing and formed onto the interior of the plug housing. In order to ensure that this sealing is fully effective in an electric motor according to the invention, the plug housing in the area of the plug-in terminations, especailly in front of the plug-in terminations of the plug contacts, forms a chamber for a mating plug housing, which chamber is open in the plug-in direction and perpendicularly thereto closed all around. In comparison with the known electric motor, in which the chamber is formed in two part
REFERENCES:
patent: 3440594 (1969-04-01), Hopp et al.
patent: 4398135 (1983-08-01), Busch et al.
patent: 4572979 (1986-02-01), Haar et al.
patent: 4614886 (1986-09-01), Schneider et al.
patent: 4639065 (1987-01-01), Kohler et al.
patent: 4727274 (1988-02-01), Adam et al.
patent: 4866317 (1989-09-01), Katayama
Baumeister Udo
Buhler Roland
Haszko Dennis R.
Lewis J. Gordon
Seitter Robert P.
Stephan Steven L.
SWF Auto-Electric GmbH
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