Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1994-09-08
2001-03-27
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C417S424100, C417S423140
Reexamination Certificate
active
06208048
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention refers to a motor-pump unit, and particularly to a motor vehicle anti-lock brake device including a motor housing, a pump housing, an electronic housing and electrical connecting lines.
European Patent Document No. A1 0 472 746 discloses a commutator motor having a deep-drawn pot-shaped housing onto the edge of the pot on the commutator side of which a cast bearing plate can be bolted. The cast bearing plate has a hollow cylindrical bearing neck which protrudes on its end and receives within it a rotor-shaft ball bearing and is developed on the outside for the placing-on of a flange opening of a hydraulic pump which is to be driven. In a bearing neck on the pot-bottom side, the rotor shaft is furthermore rotatably supported by a spherical cap bearing. A plastic cover cap is placed on the end of the pot bottom side of the motor housing which has a cable channel extending partially axially on the outside of the motor housing. An outer connecting line extends in a sealed off manner to the outside of the unit on the commutator side through an opening in the motor housing. This is connected to a customer's plug which is held in an insulated manner in the end of the pot-shaped plastic cover cap.
Furthermore, it has previously been proposed to arrange an electronic housing on the end surface of the pump housing facing away from the motor housing which receives an electric and/or electronic supply control device which is held or contacted in particular by a circuit board. The control device and circuit board are connected via electric supply and/or control lines to electric components in the motor housing, and in particular, to the brush plate arranged within the motor housing of a commutator motor. However, problems have previously occurred due to moisture penetrating the electrical supply and/or control lines and/or one or more of the housings.
SUMMARY OF THE INVENTION
In accordance with the present invention, a motor-pump unit is provided in particular for a motor vehicle anti-lock braking device, having electric connecting lines between the inside of the motor housing on the one side, and the inside of the electronic housing on the other side, for which, with simple means of manufacture and assembly, full protection against the penetration of moisture can be assured. This is achieved in accordance with the present invention as described below.
The connecting lines may be laid in accordance with the present invention between the motor housing and the electronic housing through the inside of the motor housing and the pump housing as well as the electronic housing. Additionally, the lead-throughs in the end surfaces, lying closely one in front of the other, of the housings are arranged axially one behind the other. This arrangement does not require complicated lead-outs, which are difficult to seal, of the connecting lines out of the outer wall, which is generally not flat, of the motor housing to outside the unit. It is therefore not necessary in the present invention for the laying of the connecting lines along the outer circumference of the unit and their reintroduction into the electric housing.
If a softer material is provided for one of the housings than for the other opposite housing, a seal between the two end surfaces which lie one in front of the other can be improved in a simple manner by forming on the end surface of the housing of the harder material a circumferential protruding collar which, upon the pressing against it of the other housing, for instance in the case of a bolting together, presses in a sealing manner into the end surface thereof.
In accordance with one embodiment of the present invention, for the additional sealing, the end surfaces which lie one in front of the other are sealed against each other by interposed circumferential packings in such a manner that the electric connecting lines are passed radially within the surrounding packing through the end surfaces, located one in front of the other, of the motor housing and/or pump housing and/or electronic housing.
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Dougherty Thomas M.
Kenyon & Kenyon
Siemens Aktiengesellschaft
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