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US4663813A
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Method of making an internal wave generator for strain wave gearing
Assignee: Emhart Enterprises Corp
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Filing: 1986-01-22
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Granted: 1987-05-12
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Expires: 2006-01-22
Abstract
Abstract A method of making an elliptoidal internal journal type wave generator for use with a flexspline, the latter having internal spline teeth, an outer diameter (O.D.) designated two times the radius (R), and a radial deflection (d) for spline meshing at minor axis localities with diametrically opposed spline teeth of at least one rigid circular spline, the method comprising: a. providing a circular wave generator ring with a radially inner wall diameter (I.D.) equal to twice R plus three times d, and a ring thickness 1.3 to 1.4 times the inner wall I.D.; b. opening the ring by forming only one gap at least eight times d in circumferential dimension; c. radially reducing the ring portion diametrically opposite to the gap to enhance radial flexibility of the ring while still enabling it to maintain its I.D. dimension; d. compressing the ring along an axis perpendicular to a median through the gap and the reduced portion to circumferentially decrease the gap until permanent deformation occurs establishing a minor axis dimension in the ring corresponding to loose meshing of the spline teeth; and e. further closing the gap to selectively decrease the minor axis dimension to enable the ring to preload the spline teeth.
Inventors
- 👤 John H. Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:01
CPC Classifications
F; F16; F16H; F16H33/00; F16H49/00; F16H49/001; B; B23; B23P; B23P15/00; B23P15/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49462; Y10T29/49464; Y10T74/00; Y10T74/19; Y10T74/21; Y10T74/2186
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
203 words
The method of making an elliptoidal internal journal type wave generator for use with a flexspline, the latter having internal spline teeth, an outer diameter (O.D.) designated two times the radius (R), and a radial deflection (d) for spline meshing at minor axis localities with diametrically opposed spline teeth of at least one rigid circular spline, the method comprising: a. providing a circular wave generator ring with a radially inner wall diameter (I.D.) equal to twice R plus three times d, and a ring thickness 1.3 to 1.4 times the inner wall I.D.; b. opening the ring by forming only one gap at least eight times d in circumferential dimension; c. radially reducing the ring portion diametrically opposite to the gap to enhance radial flexibility of the ring while still enabling it to maintain its I.D. dimension; d. compressing the ring along an axis perpendicular to a median through the gap and said reduced portion to circumferentially decrease the gap until permanent deformation occurs establishing a minor axis dimension in the ring corresponding to loose meshing of the spline teeth; and e. lastly, further closing the gap to selectively decrease said minor axis dimension to enable the ring to preload the spline teeth.
Claim 2
Independent Claim
203 words
The method of making an elliptoidal internal journal type wave generator for use with a flexspline, the latter having internal spline teeth, an outer diameter (O.D.) designated two times the radius (R), and a radial deflection (d) for spline meshing at minor axis localities with diametrically opposed spline teeth of at least one rigid circular spline, the method comprising: a. providing a circular wave generator ring with a radially inner wall diameter (I.D.) equal to twice R plus three times d, and a ring thickness 1.3 to 1.4 times the inner wall I.D.; b. opening the ring by forming only one gap at least eight times d in circumferential dimension; c. radially reducing the ring portion diametrically opposite to the gap to enhance radial flexibility of the ring while still enabling it to maintain its I.D. dimension; d. compressing the ring along an axis perpendicular to a median through the gap and said reduced portion to circumferentially decrease the gap until permanent deformation occurs establishing a minor axis dimension in the ring corresponding to loose meshing of the spline teeth; and e. lastly, further closing the gap to selectively decrease said minor axis dimension to enable the ring to preload the spline teeth.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the circumferential dimension of the gap is initially formed slightly more than eight times d.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein, in step c, the radially inner wall is slotted.
Claim 5
Dependent Claim
24 words
The method of claim 1, wherein in step d, a threaded means is manually operated to draw the gap to its further closed position.
Claim 6
Independent Claim
180 words
The method of making an elliptoidal internal journal type wave generator for circumferentially imparting a wave of radial deflection d in strain wave gearing to a flexible spline of outside diameter designated two times its radius R when non-deflected, the method comprising: a. forming the axial bore of a ring with a diameter equal to twice R plus three times d, and a wall thickness 15-20% of the ring bore diameter; b. forming a gap in the ring wall to provide a c-shaped ring with confronting sides of the gap spaced apart slightly more than eight times d as measured circumferentially; c. enhancing radial flexibility of the ring about a ring portion located about 180° from said gap; d. deflecting the ring about said ring portion and thus closing said gap to a dimension corresponding to a minor axis dimension in the c-ring of twice R minus d, and finally; e. further decreasing the gap to cause its sides substantially to abut and the ring to engage the minor localities of the flexspline while spaced from its major axis localities.
Claim 7
Independent Claim
180 words
The method of making an elliptoidal internal journal type wave generator for circumferentially imparting a wave of radial deflection d in strain wave gearing to a flexible spline of outside diameter designated two times its radius R when non-deflected, the method comprising: a. forming the axial bore of a ring with a diameter equal to twice R plus three times d, and a wall thickness 15-20% of the ring bore diameter; b. forming a gap in the ring wall to provide a c-shaped ring with confronting sides of the gap spaced apart slightly more than eight times d as measured circumferentially; c. enhancing radial flexibility of the ring about a ring portion located about 180° from said gap; d. deflecting the ring about said ring portion and thus closing said gap to a dimension corresponding to a minor axis dimension in the c-ring of twice R minus d, and finally; e. further decreasing the gap to cause its sides substantially to abut and the ring to engage the minor localities of the flexspline while spaced from its major axis localities.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |