US4148227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Worm and worm-rack with hydrostatic lubrication
Assignee: Werkzeugmaschinenfabrik Adolf Waldrich Cobgurg GmbH and Co
•
Filing: 1977-10-07
•
Granted: 1979-04-10
•
Expires: 1997-10-07
Abstract
Abstract A worm and worm-rack combination with hydrostatic lubrication therebetween. The teeth of the worm and the worm-rack have a trapezoidal cross-section and lubricating oil is supplied through openings in the toothed flanks. The half angle formed between each of the toothed flanks and the line of action to the axis of the worm is limited solely to the range of 6 to 10 degrees and the lead angle is in the range of 2 to 10 degrees.
Inventors
- 👤 Heinz Neugebauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:25
CPC Classifications
F; F16; F16H; F16H57/00; F16H57/04; F16H57/048; F16H57/0498; F16H57/042; F16H57/043; F16H57/0431; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19623; Y10T74/19642; Y10T74/1967; Y10T74/19991
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A worm and worm-rack having hydrostatic lubrication means therein, the teeth of said worm and worm-rack having a trapezoid section in cross-section and lubricating oil bore-holes which open into the zones between the tooth flanks of the worm and worm-rack and supplied with lubricating oil under pressure, said worm-rack being capable of very small movements toward and away from the axis of rotation of said worm in response to forces applied to said worm-rack which are at a right angle to said axis of rotation of said worm, comprising the improvement wherein the half-angle (α) formed between each of said tooth flanks and the line of action (N) to the axis of the worm is limited solely to the range of 6° to 10°, and wherein the lead angle (δ) is in the range of 2° to 10° whereby said very small relative movements between said worm and said worm-rack in response to forces applied to said worm-rack is minimized.
Claim 2
Dependent Claim
160 words
A worm and worm-rack having hydrostatic lubrication means therein, the teeth of said worm and worm-rack having a trapezoid section in cross-section and lubricating oil bore-holes which open into the zones between the tooth flanks of the worm and worm-rack and supplied with lubricating oil under pressure, said worm-rack being capable of very small movements toward and away from the axis of rotation of said worm in response to forces applied to said worm-rack which are at a right angle to said axis of rotation of said worm, comprising the improvement wherein the half-angle (α) formed between each of said tooth flanks and the line of action (N) to the axis of the worm is limited solely to the range of 6° to 10°, and wherein the lead angle (δ) is in the range of 2° to 10° whereby said very small relative movements between said worm and said worm-rack in response to forces applied to said worm-rack is minimized.
Claim 3
Dependent Claim
11 words
The improvement according to claim 1, wherein said half-angle is 7°.
Claim 4
Dependent Claim
11 words
The improvement according to claim 1, wherein said half-angle is 6°.
Claim 5
Dependent Claim
18 words
The improvement according to claim 1, wherein the lead angle is in the range of 2° to 5°.
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) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |