US3129350A

US3129350A - Commutator with oil slinger

Info

Publication number: US3129350A
Application number: US147642A
Authority: US
Inventors: Joseph P Clark
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1961-10-25
Filing date: 1961-10-25
Publication date: 1964-04-14
Anticipated expiration: 1981-04-14

Description

April 14, 1964 J. P. CLARK 3, 9,

COMMUTATOR WITH OIL SLINGER Filed Oct. 25, 1961 44 Fig, I

' INVENTOR.

Joseph F. Clark His Attorney United States Patent 3,129,350 CGMMUTATOR WITH OIL SLINGER Ioseph P. Clark, Rochester, N.Y., assignor to General Motors Corporation, Detroit, Mich, a corporation of Delaware Filed Get. 25, 1961, Ser. No. 147,642 7 Claims. (Cl. 310235) This invention pertains to commutators, and particularly to an improved commutator construction for dynamoelectric machines.

Heretofore, it has been customary in commutator-type dynamoelectric machines to attach a flared metal ring to the armature shaft between the commutator and the support for the armature shaft, this ring coacting with the bearing to prevent the flow of lubricant onto the commutator segments during rotation of the armature. This ring has been known in the art as an oil slinger, a typical example of a dynamoelectric machine embodying such an oil slinger being shown in Simmons et a1. Patent 2,982,873. The present invention relates to the formation of an integral outwardly flared rim on the core of the commutator which functions as an oil slinger and thus eliminates the necessity for the separate ring which was formerly press fitted onto the armature shaft.

Accordingly, among my objects are the provision of a commutator construction embodying integral oil slinger means; and the further provision of a commutator core having an integral outwardly flared rim on the bearing end thereof constituting an oil slinger.

The aforementioned and other objects are accomplished in the present invention by forming an integral axially extending rim on the bearing end of the commutator core having an outer diameter less than the diameter of the commutator shell and having an outwardly flared inner surface. Specifically, the improved commutator construction includes an inner cylindrical commutator shell of conductive metal which forms a part of the retaining wall of the mold cavity and is mechanically interlocked by suitable anchor means with the insulative core body of the commutator. The core body is formed with an. integral frusto conical portion on the armature end thereof, and has a stepped diameter through bore. The larger diameter portion of the through bore is encompassed by the frusto conical insulating portion, and the smaller diameter through bore is surrounded by the commutator shell. In order to facilitate press fitting of the commutator onto a knurled armature shaft, in accordance with the teachings of copending application Serial No. 774,295, filed November 17, 1958, in the name of Carlson et al. and assigned to the assignee of this invention, now Patent No. 3,080,615, the smaller diameter through bore is fluted by forming three ribs circumferentially spaced by three recesses. The bearing end of the core body is formed with an integral axially extending annulus having an outwardly flared inner wall so as to form an oil slinger which coacts with the bearing support for the commutator end of the armature shaft to prevent the flow of lubricant from the bearing onto the commutator segments.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred embodiment of the present invention is clearly shown.

In the drawing:

FIGURE 1 is a plan view of the improved commutator construction.

FIGURE 2 is an end view of the commutator shown in FIGURE 1, taken in the direction of arrow 2.

FIGURE 3 is a sectional view of the commutator taken along line 3-4: of FIGURE 2.

lCC

FIGURE 4 is an enlarged sectional view taken along line 44 of FIGURE 3.

FIGURE 5 is an enlarged fragmentary view taken along line 5-5 of FIGURE 2.

FIGURE 6 is an enlarged fragmentary sectional view showing the commutator press fitted onto an armature shaft and the relationship between the integral oil slinger and the bearing support for the commutator end of the armature shaft.

With particular reference to FIGURES 1 and 3, the improved commutator construction includes a core 10 composed of suitable insulating material such as phenolic, a condensation product of thermosetting resin, and a skeleton cylindrical commutator shell 40 of conductive metal having hook-type anchor means 42 imbedded in the core 10. Subsequent to curing the core body 10, the commutator shell 40 has a plurality of slots cut therein to form commutator segments 44 as seen in FIGURE 1.

The core body 10 has a stepped diameter through bore including a larger diameter portion 12, the major portion of which is within a frusto conical insulating portion 14 that extends axially outward from the commutator shell 40. The portion of the bore within the core 10 which is surrounded by the commutator shell 40 is fluted by the formation of three inwardly extending ribs 16, the ribs 16 being circumferentially spaced, and each subtending an angle of substantially 60. The nominal diameter of the opening formed by the ribs 16 is less than the diameter of the bore 12. The ribs 16 are spaced apart by recesses 18 which likewise subtend an angle of substantially 60, the nominal diameter of the recesses likewise being less than the diameter of the bore 12.

The core body 10 also includes an integral axially extending rim, or annulus, 25 having an outer diameter less thna the diameter of the commutator shell 40. The rim 2% has an outwardly flared inner wall 22 as clearly seen in FIGURES 3 and 5, and the edge 24 thereof is axially spaced from the commutator shell.

Referring to FIGURE 6, when the improved commutator is press fitted onto an armature shaft 46, the armature is mounted in a motor frame 48 having a self-aligning bearing 5t) at the commutator end thereof, the bearing being retained in assembled relation with the frame by a retainer 52 carried by a slinger shield 54. As is customary, a lubricant impregnated felt packing 56 is interposed between the bearing retainer 52 and the frame 48, and the integral oil slinger rim 20 of the commutator extends into the opening in the slinger shield 54 and coacts therewith to prevent the flow of lubricant from the bearing 50 onto the commutator segments 44.

By following the teachings of the present invention it is readily apparent that economies can be realized in the manufacture of dynamoelectric machines by the formation of an integral slinger ring on the commutator core in that the separate slinger rings heretofore used can be eliminated, and also the assembly operation associated therewith can be eliminated. In addition, by forming the core body with a fluted bore more realistic production tolerances can be used in the press fitting operation with out fracturing the core body.

While the embodiment of the invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted.

What is claimed is as follows:

1. A commutator comprising, a core of synthetic resinous material, segments on at least a portion of the exterior of said core, and an axially extending rim integral with said core having its edge spaced axially from said segments and constituting an integral oil slinger for said commutator.

2. A commutator comprising, a core of synthetic resinous material, segments on at least a portion of the exterior of said core, and an axially extending rim integral with said core and of smaller diameter than the diameter of said segments and having an edge spaced axially from said segments so as to constitute an oil slinger for said commutator.

3. A commutator comprising, a core of synthetic resinous material, segments on at least a portion of the exterior of said core, and an axially extending rim integral with said core having an outwardly flared inner surface and an edge spaced axially from said segments so as to constitute an oil slinger for said commutator.

4. A commutator comprising, a core of hardened thermosetting plastic material, a plurality of circumferentially spaced commutator segments on at least a portion of the exterior of said core and interlocked therewith, and an oil slinger formation extending axially outward from and integral with said core.

5. A commutator comprising, a core of hardened thermosetting plastic material, a plurality of commutator segments on at least a portion of the exterior of said core and interlocked therewith, and an oil slinger formation extending axially outward from and integral with said core and having a diameter less than the diameter of said commutator segments. a

6. In a commutator type dynamoeleetric machine having a frame, an armature shaft journalled therein and a commutator including a core attached to said armature shaft, the improvement which comprises an oil slinger formation on said commutator and integral with said core.

7. In a commutator type dynamoelectric machine having a frame, a bearing carried by said frame and an armature shaft journalled in said bearing and having a commutator including a core, the improvement which comprises oil slinger means on said commutator and j integral with said core for and coacting with said bearing to prevent the flow of lubricant from said bearing onto said commutator.

References Cited in the file of this patent UNITED STATES PATENTS 1,014,628 Lieber Jan. 9, 1912 1,993,966 Kessler Mar. 12, 1935 FOREIGN PATENTS 470,944 Great Britain Aug. 25, 1937

Claims

1. A COMMUTATOR COMPRISING, A CORE OF SYNTHETIC RESINOUS MATERIAL, SEGMENTS ON AT LEAST A PORTION OF THE EXTERIOR OF SAID CORE, AND AN AXIALLY EXTENDING RIM INTEGRAL WITH SAID CORE HAVING ITS EDGE SPACE AXIALLY FROM SAID SEGMENTS AND CONSTITUTING AN INTEGRAL OIL SLINGER FOR SAID COMMUTATOR.