Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-05-28
1993-03-16
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 67R, 310 89, H02K 510, H02K 1100
Patent
active
051947692
DESCRIPTION:
BRIEF SUMMARY
INTRODUCTION
This invention relates to an electric motor, in particular to an electric small-size motor for driving windshield wipers on motor vehicles.
BACKGROUND OF THE INVENTION
Electric small-size motors are known in which a brush holder plate 1 arranged in the motor housing also carries noise suppressors as coil or capacitor. As far as a planar brush holder plate of a hard paper is concerned the noise suppressors are freely turned up, so that they have to be adjusted when mounted and inspite of that an exactly defined position of the noise suppressors cannot be ensured. Accordingly the noise suppressing conditions differ slightly from motor to motor. Furthermore the noise suppressors on the brush holder plate are subjected to heavy shocks.
Electric small-size motors with brush holder plates made of plastic material have been available which have recesses for noise suppressors, so that the latter can be well fixed and always occupy the same position. However the noise suppressors continue to be exposed to the shocks caused by the carbon brushes. The high temperatures within the motor housing coming into existence above all in the case of blocking also act upon the noise suppressors. It has to be added that in electric small-size motors for driving windshield wipers on motor vehicles in addition to mostly three carbon brushes and the noise suppressors at least one thermal switch has to be accommodated within the motor housing.
Therefore people also had the idea not to accommodate noise suppressors, which include one or more diodes for reducing voltage peaks when the motorist switched off, on the brush holder plate, but on a separate holding device, which is substantially located outside the motor and/or gear housings. So it is for example known from the German laid open patent 3,542,632 to insert a holding device with noise suppressors in a pocket of the cup-shaped section of the gear housing, which pocket is located at the outside of the said cup-shaped section and which is open in a direction extending in parallel to the cover. In the end shield of the gear housing there is an open recess in the radial direction connecting the inside of the motor housing with the pocket on the cup-shaped section of the gear housing and through which the holding device grips into the motor housing. As far as the electric motor known from the German laid open patent 3,542,632 is concerned it is very difficult to make the motor housing impervious in the area of the holding device. The noise suppressors are also heavily exposed to outside influences.
BRIEF DESCRIPTION OF THE INVENTION
The invention is therefore based on the problem of developing an electric motor of the initially mentioned kind in such a way that with a maintenance of an automation-suitable construction the impermeability is improved.
This problem is solved according to the invention by an electric motor in which the holding device is positioned in a pocket in the interior of the cup-shaped section of the gear housing, the pocket is closed by the cover, a passage closed towards the outside is conducted from the pocket through the end shield into the motor housing and the device is connected with the carbon brush through the passage. Thus in a motor of this kind the end shield has no passage open towards the outside and which is only incompletely closed by the holding device. There are only those apertures necessary in the gear housing, in particular in the gear housing cover, through which the electric components in the holding device as well as the electric contacts of a possibly available limit switch are connected with an outside electric network, for example with the motor vehicle wiring.
As an electric component (or electric components) the holding device can also comprise one or more metal conductors which, within the gear housing and through the end shield, effect an electric connection between the terminals of the electric motor held on the gear housing and the carbon brushes in the motor housing. A metal conductor of this kind can for exam
REFERENCES:
patent: 2464847 (1949-03-01), Coffey
patent: 4857812 (1989-08-01), Mochizuki et al.
patent: 5063317 (1991-11-01), Bruhn
Ade Rolf
Buhl Harro
Schneider Theodor
Jones Judson H.
Lewis J. Gordon
Seitter Robert P.
Stephan Steven L.
SWF Auto-Electric GmbH
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