Contact assembly for a magnetic switch and method for...

H - Electricity – 01 – H

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H01H 50/54 (2006.01) H01H 1/06 (2006.01) H01H 51/06 (2006.01)

Patent

CA 2110991

The capability of heat dissipation from the contact surface of a magnetic switch for a starter motor is improved without increasing the fabrication cost. A punch 28 having a plurality of square projections arranged in two mutually perpendicular directions at the pitch of P is applied to the surface of a plate member 27 to form a first group of punched recesses 29a. The pitch P is twice the length of a side of each punched recess 29a. Then, the punch 28 is shifted with respect to the first group of punched recesses 29 by P/2 in both the vertical and horizontal directions before forming a second group of punched recesses 29b. The punched recesses 29a and 29b define projections 26 in the parts which are not occupied by these recesses generally in the pattern of a checker board. Because the projections 26 are separated from each other, and can effectively dissipate heat therefrom, the increase in the contact resistance due to heat generation can be prevented, and the efficiency of the starter motor can he increased by using a punching process which is both simple and economical.

On décrit les pièces de contact d'un commutateur à aimant destiné à un démarreur, dont on a amélioré les qualités de dissipation de la chaleur sans augmenter les coûts de production. On perce des premiers trous (29a) dans une plaque (27) à protubérances multiples grâce à une machine à poinçonner (28), trous disposés sur deux directions perpendiculaires entre elles, selon des pas égaux à P valant le double du côté de chacun d'entre eux. On perce des deuxièmes trous (29b) en décalant la machine à poinçonner (28) dans les directions longitudinale et latérale de P/2 par rapport aux premiers trous (29a). On obtient ainsi un motif en damier formé par les trous et les parties en saillies (26) dépourvues de trous. Comme ces parties en saillies (26) sont séparées, elles présentent d'excellentes qualités de dissipation de la chaleur et leur résistance de contact ne peut s'accroître du fait de températures élevées. On peut ainsi améliorer le rendement d'un démarreur, sans augmenter le coût de production de ces pièces de contact, en recourant à cette technique simple de perforation.

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