Claims
- 1. A method for production of a reinforcement ring for a commutator, comprising the steps of:
- a) providing a metal ring that is rectangular in cross section and that has an end surface and a radial surface;
- b) providing a fiberglass ring that is rectangular in cross section with an end surface, the fiberglass ring having a larger radial height than the metal ring;
- c) joining the metal and fiberglass rings at their respective end surfaces; and
- d) shifting a portion of the fiberglass ring axially in the direction of the metal ring so as to create a displaced overhang region that abuts on the radial surface of the metal ring.
- 2. The method of claim 1, characterized in that the shifting step includes a stamping procedure in which the metal ring is part of a stamping die.
- 3. The method of claim 2, characterized in that the stamping die includes a circular groove formed in a commutator.
- 4. The method of claim 1, wherein the step of providing a metal ring includes the step of providing first and second metal rings, each having an end surface and a radial surface; wherein the step of providing a fiberglass ring includes the step of providing a fiberglass ring that has first and second opposed end surfaces and an inner diameter that is smaller than the inner diameter of the metal rings; wherein the joining step includes the step of joining the end surfaces of the first and second metal rings respectively to the first and second opposed end surfaces of the fiberglass ring; and wherein the shifting step includes the step of shifting a first portion of the fiberglass ring axially in the direction of the first metal ring and a second portion of the fiberglass ring axially in the direction of the second metal ring so as to create a first displaced overhang region that abuts on the radial surface of the first metal ring and a second displaced overhang region that abuts on the radial surface of the second metal ring.
- 5. The method of claim 1, wherein the step of providing the metal ring includes the step of punching the ring out of a metal plate.
- 6. The method of claim 1, wherein the step of providing the metal ring includes the step of cutting the ring from a metal pipe.
- 7. The method of claim 1, wherein the step of providing the fiberglass ring includes the step of forming the fiberglass ring by winding glass fibers while feeding synthetic resin.
- 8. The method of claim 2, wherein the step of providing a metal ring includes the step of providing first and second metal rings, each having an end surface and a radial surface; wherein the step of providing a fiberglass ring includes the step of providing a fiberglass ring that has first and second opposed end surfaces and an inner diameter that is smaller than the inner diameter of the metal rings; wherein the joining step includes the step of joining the end surfaces of the first and second metal rings respectively to the first and second opposed end surfaces of the fiberglass ring; and wherein the shifting step includes the step of shifting a first portion of the fiberglass ring axially in the direction of the first metal ring and a second portion of the fiberglass ring axially in the direction of the second metal ring so as to create a first displaced overhang region that abuts on the radial surface of the first metal ring and a second displaced overhang region that abuts on the radial surface of the second metal ring.
- 9. The method of claim 3, wherein the step of providing a metal ring includes the step of providing first and second metal rings, each having an end surface and a radial surface; wherein the step of providing a fiberglass ring includes the step of providing a fiberglass ring that has first and second opposed end surfaces and an inner diameter that is smaller than the inner diameter of the metal rings; wherein the joining step includes the step of joining the end surfaces of the first and second metal rings respectively to the first and second opposed end surfaces of the fiberglass ring; and wherein the shifting step includes the step of shifting a first portion of the fiberglass ring axially in the direction of the first metal ring and a second portion of the fiberglass ring axially in the direction of the second metal ring so as to create a first displaced overhang region that abuts on the radial surface of the first metal ring and a second displaced overhang region that abuts on the radial surface of the second metal ring.
- 10. The method of claim 4, wherein the first and second metal rings are joined to the fiberglass ring substantially simultaneously.
- 11. The method of claim 8, wherein the first and second metal rings are joined to the fiberglass ring substantially simultaneously.
- 12. The method of claim 9, wherein the first and second metal rings are joined to the fiberglass ring substantially simultaneously.
- 13. A method of manufacturing a commutator, comprising the steps of:
- (a) manufacturing a reinforcement ring by the method comprising the steps of:
- (a)(1) providing a metal ring that is rectangular in cross section and that has an end surface and a radial surface;
- (a)(2) providing a fiberglass ring that is rectangular in cross section with an end surface, the fiberglass ring having a larger radial height than the metal ring;
- (a)(3) joining the metal and fiberglass rings at their respective end surfaces; and
- (a)(4) shifting a portion of the fiberglass ring axially in the direction of the metal ring so as to create a displaced overhang region that abuts on the radial surface of the metal ring;
- (b) inserting said reinforcement ring into a circular groove provided in a plurality of commutator segments circularly arranged around an axis in a spaced relationship; and
- (c) subsequently filling the remainder of the groove and the spaces between each two adjacent segments with a molding compound.
- 14. The method of claim 13, wherein the displaced overhang region of the fiberglass ring abuts the radial outer surface of the metal ring, and wherein the circular groove for accommodation of the reinforcement ring is beveled in the axial direction so that the fiberglass ring is tilted inward to the axis, thereby pre-tensioning the metal ring radially inward.
- 15. The method of claim 14, wherein the displaced overhang region of the fiberglass ring abuts the radial inner surface of the metal ring, and wherein the circular groove for accommodation of the reinforcement ring is beveled in the axial direction so that the fiberglass ring is tilted outward to a cylindrical surface of the commutator, thereby pre-tensioning the metal ring radially outward.
- 16. The method of claim 14, wherein the circular groove to accommodate the reinforcement ring is configured such that the fiberglass ring is held in place by frictional locking after being inserted.
- 17. The method of claim 14, wherein the circular groove to accommodate the reinforcement ring has a bulge on a wall adjacent to the axis of the commutator, so that both the metal ring and the fiberglass ring are radially pretensioned outward.
- 18. The method of claim 14, wherein a part of the reinforcement ring is tensioned-loaded by the commutator segments, and the reinforcement ring remains pre-tensioned after the commutator is cast in casting compound.
- 19. The method of claim 18, characterized in that the commutator segments are deformed by mortising a notchlike groove or by bending.
Priority Claims (1)
Number |
Date |
Country |
Kind |
PCT/EP94/00381 |
Feb 1994 |
WOX |
|
CROSS-REFERENCE TO RELATED APPLICATION
This application is a Division of application Ser. No. 08/535,010; filed as an International Application on Feb. 10, 1995; issuing as U.S. Pat. No. 5,736,804, which is a 371 of PCT/EP95/00495 filed Feb. 10, 1995.
US Referenced Citations (12)
Foreign Referenced Citations (6)
Number |
Date |
Country |
350855 |
Nov 1989 |
EPX |
599911 |
Jun 1934 |
DEX |
1056256 |
Apr 1959 |
DEX |
393507 |
Nov 1965 |
CHX |
464334 |
Dec 1968 |
CHX |
1312059 |
Apr 1973 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
535010 |
|
|