Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-05-24
2001-03-20
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C363S141000, C363S145000
Reexamination Certificate
active
06204581
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a commutator adapted for use in alternators of cars, more particularly to a commutator, the components of which are secured in an improved manner to increase the structural strength thereof so as to enhance various effects thereof.
(b) Description of the Prior Art
With reference to
FIG. 1
, components and parts of a conventional car alternator mainly include a heat dissipating plate, a base plate, terminals, and diodes. The diodes provided on the body of the heat dissipating plate are in direct contact with the body. The terminals have conductive plates that are integrally bent and extending therefrom and that are soldered to the diodes for electrical conduction. However, in actual use, the conventional commutator heat dissipating structure has the following disadvantages:
1. The terminals are secured using screws or by press fastening. However, as the screws may easily loosen when shaken, the terminals may displace to affect smooth operation of the alternator.
2. The expansion cooling and heat transfer extension areas of the cooling fins are small and unable to achieve satisfactory heat dissipation.
3. In order to achieve insulation, securing posts used to secure the heating dissipating plate and the base plate are generally formed from plastic material and are vulnerable to breaking at the joints when subjected to a shear force, which may cause the heat dissipating plate to become detached from the base plate.
4. In general after the diodes are secured in the heat dissipating plate, they are directly protected by a top cover, however, chips inside the diodes are fragile and edges thereof may easily break, which will affect the commutation effect of the diodes.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide an improved commutator heat dissipating device for alternators to positively secure the terminal in position, to enhance the heat dissipating effect, and to strength the overall structure of the commutator.
The present invention provides the following advantages in various aspects:
1. For manufacturers, faulty products due to bad structural design can be avoided. The present invention helps speed up production to meet customers' demands and to enhance market competitiveness.
2. For customers, the present invention provides a practical commutator with good adaptability. Besides, they need not worry about faulty products or stock.
3. For end users, the present invention does not require frequent replacement, maintenance or repair. Costs can therefore be reduced.
According to the present invention, a preferred embodiment of an improved commutator heat dissipating device includes An improved commutator heat dissipating device for alternators, the commutator including a heat dissipating plate, a base plate, a top cover, terminals, and diodes. The heat dissipating plate has a body including a plurality of recesses for receiving the diodes and a plurality of integrally connected wavy cooling fins on an opposite side thereof. An insulation plate is disposed between a bottom side of the body and the base plate. Securing posts pass through through holes in the heat dissipating plate to secure the heat dissipating plate and the base plate. The terminals include insulating elements and conductive plates. The insulating elements are capable of positioning the terminals by means of limiting blocks and posts of the heat dissipating plate to enable the conductive plates to be soldered with the diodes. The commutator has excellent heat dissipating effects and enhanced structural strength to achieve smooth operation of machine elements.
REFERENCES:
patent: 3609428 (1971-09-01), Cotton et al.
patent: 3866072 (1975-02-01), Nagai
patent: 5424594 (1995-06-01), Saito et al.
patent: 5451823 (1995-09-01), Deverall et al.
patent: 5828564 (1998-10-01), Mori et al.
patent: 5866963 (1999-02-01), Weiner et al.
patent: 5991184 (1999-11-01), Russell et al.
Dinh Le Dang
Dougherty & Troxell
Ramirez Nestor
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