Reinforcement ring for rotating bodies and method of producing t

Details Reinforcement ring for rotating bodies and method of producing t Reinforcement ring for rotating bodies and method of producing t

1995-12-04

1998-04-07

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310233, 310234, 310236, 310271, H01R 4306

Patent

active

057368040

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention concerns a reinforcement ring for rotating bodies, such as commutators, a method for its manufacture, and the application of the invented reinforcement rings in commutators.
There are various known designs of commutators which are strengthened with fiberglass reinforcement rings. Despite the great advantages of these commutators (for example, the low weight and the possibility of simple and dimensionally precise manufacture of the fiberglass rings and the commutators), since the reinforcement rings simultaneously function as electrical insulators, such commutators nevertheless have one drawback compared to commutators reinforced with steel rings. This drawback becomes manifest when these commutators are used for motors under high thermal load or when operating for a long time under high temperature influences. It is also possible for a thermal overload to occur as a result of some kind of fault. Whenever there is thermal overload, a local softening of the insulation ring or fiberglass ring can occur. This has the consequence that the commutator segments can be pushed beyond the tolerance values, thereby considerably shortening the lifetime of such commutators.


SUMMARY OF THE INVENTION

Thus, the purpose of the invention is to provide a reinforcement ring that can be subjected to a high thermal Load and at the same time preserves the advantages of fiberglass reinforcement rings. This purpose is achieved, according to the invention, by a reinforcement ring for rotating bodies in which at least one metal ring that is rectangular in cross section is integrated on its front surface with a fiberglass ring which is rectangular in cross section. This ensures that no shifting of the commutator segments occurs, even at temperatures where the fiberglass ring is softened. It is of particular advantage if the fiberglass ring has greater radial height than the metal ring, and for the overhang zone to be set off from the metal ring and abut against one or both of the radial surfaces or circumferential surfaces of the metal ring.
The solution according to the invention has the advantage that it is possible to use only half of the otherwise customary radial height of the fiberglass ring and the steel or metal ring to make the compound ring. This means that the production costs of these rings are not significantly increased, as would be the case if the two rings had to be nested in each other.
Another advantage of this compound reinforcement ring consists in that the fitting together at the end surface does not require very close tolerances in producing the respective diameters at which the two rings mate shearwise. If the fiberglass ring and the steel ring were nested together, the diameter tolerances at the joining site would have to be many times smaller than those of the invented reinforcement rings.
If the commutator is designed for maximum thermal and dynamic loading, it is especially advantageous for the corresponding reinforcement ring to have two metal rings, arranged on the respective end surfaces of the fiberglass ring. This strength can be further enhanced if the reinforcement ring is fashioned such that the fiberglass ring has both a larger outer diameter and a smaller inner diameter than the two metal rings and both overhang zones are axially offset partly in the direction of the metal rings, so that the one overhang zone abuts against the radial inner surface of the one metal ring and the other overhang zone abuts against the radial outer surface of the other metal ring, while it is advantageous to have both metal rings of identical configuration.
Another basic purpose of the invention is to specify a method of production of a reinforcement ring for rotating bodies, such as commutators, which has a high thermal load capacity and the respective advantages of metal rings and fiberglass rings, which at the same time can be produced in a very cost-effective way.
The solution of this problem according to the invention involves a method of production of a reinforcement r

REFERENCES:
patent: 4562369 (1985-12-01), Gerlach et al.
patent: 4598463 (1986-07-01), Gerlach et al.
patent: 4868440 (1989-09-01), Gerlach
patent: 5497042 (1996-03-01), Nettelhoff

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