Patent US3592072A successfully refreshed from Google Patents.
US3592072A
Expired / Lapsed
US
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Ball nut mechanism
Assignee: SKF AB
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Filing: 1969-05-12
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Granted: 1971-07-13
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Expires: 1989-05-12
Abstract
Abstract To ensure a smooth transfer of the balls in a ball nut mechanism, the nut is provided with an elongated, solid catching member, which is designed to extend into the ball race and has an obliquely cut edge, which forms the base of a tangential passage for guiding the balls away from the race towards a return passage within the nut.
Inventors
- 👤 Sven Walter Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:13
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/22; F16H25/2204; F16H25/2214; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702; Y10T74/19744; Y10T74/19749; Y10T74/19767; Y10T74/19772
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
198 words
In a ball nut mechanism of the type comprising a shaft provided with a helical groove in its outer envelope surface, a cylindrical nut having a mating helical groove in its internal envelope surface defining therewith a ball race, a number of balls cooperating with the race, and a recirculation passage provided in the nut by an outwardly open groove having substantially the same breadth and depth as the diameter of the balls and extending helically along part of the length of the nut, a sleeve surrounding the nut and closing the groove to define a closed passage and a catching member at each end of the passage, the improvement being that the groove at both ends cuts through the body of the nut, a wedge-shaped fitting piece being located in each deep cut end of the groove, each fitting piece having an internal arched surface forming an extension of the bottom of the groove in the nut at the end of the return passage to the outer periphery of the nut terminating at the sleeve, and the outer surface of the fitting piece being formed as a circular arc corresponding to the outer contour of the nut.
Claim 2
Dependent Claim
198 words
In a ball nut mechanism of the type comprising a shaft provided with a helical groove in its outer envelope surface, a cylindrical nut having a mating helical groove in its internal envelope surface defining therewith a ball race, a number of balls cooperating with the race, and a recirculation passage provided in the nut by an outwardly open groove having substantially the same breadth and depth as the diameter of the balls and extending helically along part of the length of the nut, a sleeve surrounding the nut and closing the groove to define a closed passage and a catching member at each end of the passage, the improvement being that the groove at both ends cuts through the body of the nut, a wedge-shaped fitting piece being located in each deep cut end of the groove, each fitting piece having an internal arched surface forming an extension of the bottom of the groove in the nut at the end of the return passage to the outer periphery of the nut terminating at the sleeve, and the outer surface of the fitting piece being formed as a circular arc corresponding to the outer contour of the nut.
Claim 3
Dependent Claim
67 words
The ball nut mechanism as claimed in claim 1 in which the deep cut end portions of the groove are broader than the main run of the groove and are broader than the main run of the groove down to a depth corresponding to the diameter of the balls, and the breadth of the fitting pieces being sufficient to fill the enlarged end portions of the groove.
References Cited (Backward Citations)
US969215A
Cited
US2995947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |