Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-03-05
1994-07-19
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 71, H02K 1100
Patent
active
053312317
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a rectifier device for three-phase generators in vehicles.
More particularly it relates to a rectifier device having two metallic cooling plates, and diodes inserted in the latter and having a printed circuit board and a positive connection including a threaded bolt.
In a rectifier device of this type known from the German Utility Model G 87 11 178 a connecting bolt for the connection of the rectifier device, which connection is designated by B+ according to German Industrial Standard, is inserted into the outer cooling plate of the two cooling plates of the rectifier diodes lying parallel at a distance to one another in that it is pressed into a corresponding hole of the outer cooling plate with a flange and contacts the annular shoulder of the screw head at the back of the cooling plate. The threaded bolt is tightly screwed to the cooling plate with a nut for protection. The rectifier device is mounted at the so-called B side of the three-phase generator. After the generator is installed in the vehicle a connection cable for the positive pole of the vehicle battery is securely screwed on to the free end of the threaded bolt.
A disadvantage in such solutions consists in that forces can act on the connection during strong vibrations and high starting torques and bending moments resulting in a deformation of the cooling plate or loosening of the fastening at the flange.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a rectifier device which avoids the disadvantages of the prior art.
More particularly, it is an object of the present invention to provide a rectifier device in which forces acting on a connecting bolt providing an electrical connection to the front cooling plate are distributed so that the bolt can withstand required stresses.
According to the invention, the rectifier device for a three-phase generator of a vehicle, comprises a metallic front cooling plate provided with a hole and a rear cooling plate provided with an opening, the cooling plates being spaced from each other and extending parallel to each other; a plurality of positive diodes arranged on one cooling plate and a plurality of negative diodes arranged on the other cooling plate; a printed circuit board made of insulating material fastened between the front and rear cooling plates and having electrical conductors for connecting the diodes with each other and also with a three-phrase generator; electrical connection means for making electrical connection with the front cooling plate comprising a nut and a threaded bolt having a flange, an annular shoulder and an axial pin projecting into the opening of the rear cooling plate, the threaded bolt being pressed in the hole in the front cooling plate and the flange and shoulder being positioned and dimensioned so that the annular shoulder contacts on the rear side of the front cooling plate, the nut being screwed on the threaded bolt from the front side of the front cooling plate to secure the threaded bolt in the hole; and insulating means for electrically insulating the threaded bolt from the rear cooling plate, the insulating means being received in the opening and receiving the axial pin.
When the rectifier device is designed in accordance with the present invention, it has the advantage that the forces of vibrations, starting torques and bending moments are transmitted into the two cooling plates. The bending forces in particular are ineffective since they are transmitted into the two cooling plates parallel to the plate planes. Accordingly, a deformation of the positive cooling plate is no longer possible. Another advantage consists in that this solution can be realized without additional structural component parts.
A particularly advantageous construction consists in that the insulating material bush for the rear pin of the threaded bolt of the positive connection of the rectifier device is formed on at the printed circuit board located between the two cooling plates.
A metal
REFERENCES:
patent: 3629631 (1971-12-01), Thomas et al.
patent: 4232238 (1980-11-01), Saito et al.
patent: 4419597 (1983-12-01), Shiga et al.
patent: 4554574 (1985-11-01), Wright
patent: 4606000 (1986-08-01), Steele et al.
patent: 4952829 (1990-08-01), Armbruster et al.
Fasterding Henning
Koplin Karl-Heinz
Pflueger Gerhard
Renner Stefan
Nguyen Matthew
Robert & Bosch GmbH
Stephan Steven L.
Striker Michael J.
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