US3722312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and nut for preloading ball screw assemblies and method of manufacture of the preload nut member
Assignee: Bendix Corp
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Filing: 1971-03-23
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Granted: 1973-03-27
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Expires: 1991-03-23
Abstract
Abstract An improved method and nut for preloading ball screw assemblies in which the preloading is accomplished by axially offsetting segments of the internal helical grooves of the nut member, the method comprising permanently deforming an intermediate portion of the nut member so as to cause an axial shift of the connected nut member portion and thus result in axially offset helical groove segments in these portions. The nut member is configured to accommodate readily large permanent deformations. This deformation is produced in the specific process described by rolling a peripheral groove into the nut member.
Inventors
- 👤 B Better
- 👤 E Hain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:37
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/22; F16H25/2204; F16H25/2209; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18728; Y10T74/19; Y10T74/19623
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
34 words
A method of axially offsetting portions of a helically grooved member comprising: permanently deforming an intermediate section of saId member so as to cause a relative axial shift in position of said grooved portions.
Claim 2
Independent Claim
34 words
A method of axially offsetting portions of a helically grooved member comprising: permanently deforming an intermediate section of saId member so as to cause a relative axial shift in position of said grooved portions.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein in said deforming step said member is permanently deformed radially inwardly about its periphery at said intermediate section.
Claim 4
Independent Claim
59 words
A method of preloading a ball screw assembly having a screw member, a nut member and a plurality of recirculating balls comprising the step of permanently deforming an intermediate section of said nut so as to cause a relative axial shift in position of the nut portions connected thereby sufficient to preload said balls in said ball screw assembly.
Claim 5
Independent Claim
59 words
A method of preloading a ball screw assembly having a screw member, a nut member and a plurality of recirculating balls comprising the step of permanently deforming an intermediate section of said nut so as to cause a relative axial shift in position of the nut portions connected thereby sufficient to preload said balls in said ball screw assembly.
Claim 6
Dependent Claim
16 words
The method of claim 3 wherein said section is permanently deformed radially inwardly about its periphery.
Claim 7
Dependent Claim
15 words
The method of claim 4 wherein said deforming step is carried by rolling said section.
Claim 8
Dependent Claim
21 words
The method of claim 3 wherein said section of said nut is permanently deformed prior to assembly of said ball screw.
Claim 9
Dependent Claim
24 words
The method of claim 3 wherein said ball screw is assembled with said recirCulating balls in place prior to permanently deforming said nut section.
Claim 10
Dependent Claim
58 words
A nut comprising a member having an internally helically grooved bore therethrough and an intermediate recess extending about the bore and separating the bore into two portions, and further including an external groove formed about said member aligned with said recess, whereby said nut member may be permanently deformed radially inwardly to cause axial shifting of said portions.
Claim 11
Dependent Claim
58 words
A nut comprising a member having an internally helically grooved bore therethrough and an intermediate recess extending about the bore and separating the bore into two portions, and further including an external groove formed about said member aligned with said recess, whereby said nut member may be permanently deformed radially inwardly to cause axial shifting of said portions.
Claim 12
Independent Claim
67 words
A method of manufacturing a nut member which has aligned internally helically grooved portions axially offset from each other comprising the steps of: forming a helical groove through a bore in said nut member; permanently deforming said nut member radially inwardly about its periphery at a section intermediate said helical groove, whereby portions of said helical groove connected by said section are axially offset from each other.
Claim 13
Independent Claim
67 words
A method of manufacturing a nut member which has aligned internally helically grooved portions axially offset from each other comprising the steps of: forming a helical groove through a bore in said nut member; permanently deforming said nut member radially inwardly about its periphery at a section intermediate said helical groove, whereby portions of said helical groove connected by said section are axially offset from each other.
Claim 14
Dependent Claim
23 words
The method of claim 9 wherein said deforming step is carried out by rolling a groove in the periphery of said nut member.
Claim 15
Dependent Claim
30 words
The method of claim 10 wherein prior to said rolling step an exterior groove is machined said member about the periphery of said intermediate section to guide said rolling operation.
Claim 16
Dependent Claim
22 words
The method of claim 9 wherein prior to deforming said section an undercut is formed in said bore at said intermediate section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |