US3696483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for finishing an antifriction-bearing raceway
Assignee: Torrington Co Ltd
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Filing: 1971-01-21
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Granted: 1972-10-10
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Expires: 1991-01-21
Abstract
Abstract The invention contemplates a method of burnishing a raceway surface for balls or like elements in an antifriction bearing, wherein the burnishing proceeds on a machined raceway surface, in the course of radially compressing an antifriction element between a reference raceway and the unfinished raceway, all while maintaining continuous rolling contact of the element in the two raceways. A specific tool illustrates use of the method in application to ball-bearing races, one embodiment being shown for such finishing of the raceway of an inner-bearing ring, and another embodiment being shown for such finishing of the raceway of an outer-bearing ring. In either event, the method is illustratively performed on an automatic screw machine, after the raceway has been turned at the end of tubular stock, and prior to the cut-off operation which severs the machined and burnished bearing ring from remaining tubular stock.
Inventors
- 👤 Charles R Burk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:08
CPC Classifications
F; F16; F16C; F16C19/00; F16C19/02; F16C19/04; B; B24; B24B; B24B39/00; B24B39/02; B24B39/023; F16C33/00; F16C33/30; F16C33/58; F16C33/64; Y; Y10; Y10T; Y10T29/00; Y10T29/47; Y10T29/49; Y10T29/49636; Y10T29/49703
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
195 words
A tool for burnishing an unfinishEd antifriction raceway, comprising an elongated body with means for fixedly mounting the same in a given orientation, an antifriction-bearing ring having a raceway substantially complementary to the raceway to be burnished and means on said body supporting said ring for free rotation on its axis and with the raceway of said ring facing radially away from the rotary support thereof, the curvature of said raceways being compatible with rolling-contact support of an antifriction element of a given diameter, and retainer means fixedly carried by said body and including element-retaining means projecting axially into radially overlapping clearance relation with said ring raceway; the projecting part of said retaining means being of such limited radial extent with respect to said axis that an antifriction element of said diameter riding said ring raceway and located by said retaining means will project radially clear of said retaining means to an extent exceeding the radial depth of the unfinished raceway; whereby the unfinished raceway may be burnished by rotating the same about its axis while radially eccentrically forcing the elementequipped tool into the unfinished raceway on substantially the radial alignment of the retained element.
Claim 2
Dependent Claim
195 words
A tool for burnishing an unfinishEd antifriction raceway, comprising an elongated body with means for fixedly mounting the same in a given orientation, an antifriction-bearing ring having a raceway substantially complementary to the raceway to be burnished and means on said body supporting said ring for free rotation on its axis and with the raceway of said ring facing radially away from the rotary support thereof, the curvature of said raceways being compatible with rolling-contact support of an antifriction element of a given diameter, and retainer means fixedly carried by said body and including element-retaining means projecting axially into radially overlapping clearance relation with said ring raceway; the projecting part of said retaining means being of such limited radial extent with respect to said axis that an antifriction element of said diameter riding said ring raceway and located by said retaining means will project radially clear of said retaining means to an extent exceeding the radial depth of the unfinished raceway; whereby the unfinished raceway may be burnished by rotating the same about its axis while radially eccentrically forcing the elementequipped tool into the unfinished raceway on substantially the radial alignment of the retained element.
Claim 3
Dependent Claim
18 words
The tool of claim 1, in which said element is a ball and said raceways are ball raceways.
Claim 4
Dependent Claim
46 words
The tool of claim 1, in which said bearing ring is an inner ring with a radially outwardly facing raceway, said element being positioned by said retaining means at a given angular location and projecting radially outwardly for operation on a radially inwardly facing unfinished raceway.
Claim 5
Dependent Claim
46 words
The tool of claim 1, in which said bearing ring is an outer ring with a radially inwardly facing raceway, said element being positioned by said retaining means at a given angular location and projecting radially inwardly for operation on a radially outwardly facing unfinished raceway.
Claim 6
Dependent Claim
41 words
The tool of claim 1, in which said body includes a cylindrical portion, and in which said retaining means comprises a ring having a bore fitted to said cylindrical portion, and means for adjustably securing said last-mentioned ring to said body.
Claim 7
Dependent Claim
30 words
The tool of claim 3, in which said body includes an axially projecting stud portion, and antifriction-bearing means supporting said inner bearing ring for free rotation on said stud portion.
Claim 8
Dependent Claim
22 words
The tool of claim 6, in which said stud portion is a separate part, threadedly engaged to the remainder of said body.
Claim 9
Dependent Claim
41 words
The tool of claim 7, in which said stud part includes an axially outer radial flange and a shoulder at the end of the threaded portion, the spacing between said flange and shoulder exceeding the axial length of said antifriction-bearing means.
Claim 10
Dependent Claim
16 words
The tool of claim 8, in which said antifriction-bearing means includes a plurality of roller elements.
Claim 11
Dependent Claim
30 words
The tool of claim 4, in which said body includes an axially projecting sleeve portion, and antifriction-bearing means supporting said outer bearing ring for free rotation within said sleeve portion.
Claim 12
Dependent Claim
26 words
The tool of claim 10, in which said sleeve portion is a separate part and means removably securing the same to the remainder of said body.
Claim 13
Dependent Claim
37 words
The tool of claim 11, in which said sleeve part includes an axially outer radial flange which is axially spaced from the remainder of said body to an extent exceeding the axial length of said antifriction-bearing means.
Claim 14
Dependent Claim
17 words
The tool of claim 12, in which said antifriction bearing means includes a plurality of roller elements.
Claim 15
Independent Claim
149 words
The method of burnishing the unfinished raceway of ball ball-bearing ring, which comprises selecting a ball-bearing ring having a raceway having a curvature compatible with that of the unfinished raceway, said selected ring having a characteristic radius of ball-center support which is so materially different from the radius of ball-center support which is characteristic of the unfinished raceway that a ball in one raceway and centered on one of said radii will clear the other raCeway sidewall when axially overlapped therewith, supporting the selected ring for free rotation, rotationally driving the unfinished ring, retaining a ball at substantially a fixed angular location about the bearing-ring axis, and radially compressing the ball between said raceways on a radially directed alignment substantially at the fixed angular location, whereby the ball-bearing ring may be driven in rotation by the rotation of the ball as it tracks and burnishes the rotating unfinished raceway.
Claim 16
Independent Claim
149 words
The method of burnishing the unfinished raceway of ball ball-bearing ring, which comprises selecting a ball-bearing ring having a raceway having a curvature compatible with that of the unfinished raceway, said selected ring having a characteristic radius of ball-center support which is so materially different from the radius of ball-center support which is characteristic of the unfinished raceway that a ball in one raceway and centered on one of said radii will clear the other raCeway sidewall when axially overlapped therewith, supporting the selected ring for free rotation, rotationally driving the unfinished ring, retaining a ball at substantially a fixed angular location about the bearing-ring axis, and radially compressing the ball between said raceways on a radially directed alignment substantially at the fixed angular location, whereby the ball-bearing ring may be driven in rotation by the rotation of the ball as it tracks and burnishes the rotating unfinished raceway.
Claim 17
Independent Claim
97 words
The method of making a ball-bearing ring, which comprises selecting a tubular element and forming a ball-raceway groove therein, selecting a ball-bearing ring with a raceway groove of curvature compatible with that of the formed ball-raceway groove, selecting a ball of diameter compatible with the curvature of the raceways and inserting the same between raceways at a given angular location, radially compressionally stressing said selected ring and stock via said ball, supporting the stock and the selected ring for relative rotation while thus compressionally stressed, and retaining the ball at the angular location of such compressional loading.
Claim 18
Independent Claim
97 words
The method of making a ball-bearing ring, which comprises selecting a tubular element and forming a ball-raceway groove therein, selecting a ball-bearing ring with a raceway groove of curvature compatible with that of the formed ball-raceway groove, selecting a ball of diameter compatible with the curvature of the raceways and inserting the same between raceways at a given angular location, radially compressionally stressing said selected ring and stock via said ball, supporting the stock and the selected ring for relative rotation while thus compressionally stressed, and retaining the ball at the angular location of such compressional loading.
Claim 19
Dependent Claim
22 words
The method of claim 15, in which said tubular stock is relatively ductile and said selected ring and ball are relatively hard.
Claim 20
Dependent Claim
16 words
The method of claim 16, and including the further step of hardening 16 the burnished element.
Claim 21
Dependent Claim
71 words
The method of claim 15, wherein the tubular element is a piece of stock of axial length exceeding the length of the bearing ring to be produced, chucking the tubular element in such manner as to project at least an end including the formed raceway and to an extent exceeding the length of the bearing ring to be produced, and cutting off to said length after burnishing the formed raceway groove.
Claim 22
Dependent Claim
14 words
The method of claim 18, wherein the rotation is effected by rotating said chuck.
References Cited (Backward Citations)
US3242567A
Cited
US3350762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |