US3673886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball nut screw assembly
Assignee: Toyoda Koki KK
•
Filing: 1970-12-14
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Granted: 1972-07-04
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Expires: 1990-12-14
Abstract
Abstract A ball nut screw assembly comprises a screw, a nut, and a train of balls within a passageway formed by the helical grooves in the screw and nut and embraced by a plurality, up to four engaging profiles perpendicular to the helical lead wherein at least one of said engaging profiles is formed by two complex profile portions to produce a moment for righting the ball to its predetermined rolling locus when the ball deviates (runs off) from the locus.
Inventors
- 👤 Tamaki Tomita
- 👤 Akira Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:49
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/22; F16H25/2204; F16H2025/2242; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702; Y10T74/19721
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
181 words
In a ball screw and nut assembly, a screw and nut respectively formed with coacting complementary helical grooves which define an elongated helical passageway extending helically around the axis of said screw, a train of balls confined within said passageway, each groove having in a plane perpendicular to the lead of its helical groove a pair of ball-engaging profiles so that said grooves provide four engaging profiles for each ball, at least two of said engaging profiles each having an elongated relatively narrow substantially central ball-engaging profile means and a pair of lateral profile means which dO not engage the balls and between which said central profile means is located with said pair of lateral profile means intersecting said central profile means and defining therewith a pair of edges, said central and pair of lateral profile means of each of said two ball-engaging profiles coacting with each ball for automatically creating for each ball a righting force which automatically maintains each ball along a predetermined rolling locus engaging said central profile means when a ball tends to deviate from said locus.
Claim 2
Dependent Claim
181 words
In a ball screw and nut assembly, a screw and nut respectively formed with coacting complementary helical grooves which define an elongated helical passageway extending helically around the axis of said screw, a train of balls confined within said passageway, each groove having in a plane perpendicular to the lead of its helical groove a pair of ball-engaging profiles so that said grooves provide four engaging profiles for each ball, at least two of said engaging profiles each having an elongated relatively narrow substantially central ball-engaging profile means and a pair of lateral profile means which dO not engage the balls and between which said central profile means is located with said pair of lateral profile means intersecting said central profile means and defining therewith a pair of edges, said central and pair of lateral profile means of each of said two ball-engaging profiles coacting with each ball for automatically creating for each ball a righting force which automatically maintains each ball along a predetermined rolling locus engaging said central profile means when a ball tends to deviate from said locus.
Claim 3
Dependent Claim
29 words
The combination of claim 1 and wherein said two ball-engaging profiles each of which is formed with said central and lateral profile means are part of the same groove.
Claim 4
Dependent Claim
42 words
The combination of claim 1 and wherein said two ball-engaging profiles each of which is formed with said central and pair of lateral profile means are respectively a pair of opposed ball-engaging profiles of the grooves formed in said nut and screw.
Claim 5
Dependent Claim
25 words
The combination of claim 1 and wherein all four of said ball-engaging profiles are each provided with said central and pair of lateral profile means.
Claim 6
Dependent Claim
39 words
The combination of claim 1 and wherein each of said central profile means contacts each ball in a direction of about 45* relative to a perpendicular drawn from the center of each ball to the axis of said screw.
Claim 7
Dependent Claim
68 words
The combination of claim 1 and wherein each of said central profile means is concave and said pair of lateral profile means of each of said two ball-engaging profiles being spaced from each ball by a distance at least as great as tangents to each ball at the edges where said pair of lateral profile means intersect the central profile means of each of said two ball-engaging profiles.
Claim 8
Dependent Claim
27 words
The combination of claim 6 and wherein said pair of lateral profile means of each of said two ball-engaging profiles are straight and extend along said tangents.
Claim 9
Dependent Claim
27 words
The combination of claim 6 and wherein said pair of lateral profile means of each of said two ball-engaging profiles are concave and situated beyond said tangents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |