US4663813A — Method of making an internal wave generator for s…

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.

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

Method of making an internal wave generator for strain wave gearing

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