US3675459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing bevel gears
Assignee: Individual
•
Filing: 1971-02-03
•
Granted: 1972-07-11
•
Expires: 1991-02-03
Abstract
Abstract A method for manufacturing bevel gear is disclosed according to which a workpiece is prepared for placement into a suitable die and to have convex contour tangent to the cone defined by the root circles of the bevel gear to be made, the axial end face of the workpiece has diameter about equal to or smaller than the smallest root circle of the bevel gear.
Inventors
- 👤 Fritz Dohmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:12
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/28; B21K1/30; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49462; Y10T29/49467; Y10T29/49474
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
160 words
A method for manufacturing bevel gears comprising the steps of: providing a die having a cavity with contour to obtain a bevel gear, the die having groove forming projections defining a cone corresponding to the roots of the gear to be made, there being a smallest root circle defined in the axially facing bottom of the die; preparing a blank with a circumferential surface having axially rotational symmetry in relation to an axis, at least a portion of the surface being convexly-shaped in any plane which includes the axis, the surface of the blank which faces and is closest to the bottom of the die along the axis thereof when inserted, having dimensions about equal to or smaller than the smallest tooth root circle of the die, the blank, when inserted into the die, projecting therein not farther than the bottom; and working the thus prepared blank by using the die and press forming the blank into a bevel gear.
Claim 2
Independent Claim
160 words
A method for manufacturing bevel gears comprising the steps of: providing a die having a cavity with contour to obtain a bevel gear, the die having groove forming projections defining a cone corresponding to the roots of the gear to be made, there being a smallest root circle defined in the axially facing bottom of the die; preparing a blank with a circumferential surface having axially rotational symmetry in relation to an axis, at least a portion of the surface being convexly-shaped in any plane which includes the axis, the surface of the blank which faces and is closest to the bottom of the die along the axis thereof when inserted, having dimensions about equal to or smaller than the smallest tooth root circle of the die, the blank, when inserted into the die, projecting therein not farther than the bottom; and working the thus prepared blank by using the die and press forming the blank into a bevel gear.
Claim 3
Dependent Claim
30 words
The method as defined in claim 1, wherein said blank is being prepared to have convex outer contour to be seated on the cone above the bottom of the die.
Claim 4
Dependent Claim
68 words
The method as in claim 1, the convexity of the blank selected so that upon coaxial placement of the blank into the die, the convex contour of the blank is about tangent to the axial semi-height of the gearing to be provided by the die, while the largest diameter of the convex workpiece is at about the level of the largest gear diameter as defined by the die.
Claim 5
Dependent Claim
38 words
Method as in claim 3, convexity of the workpiece being selected so that upon placement thereof into the die, the axial end face remains in spaced apart relation from the bottom of the die, prior to punch pressing.
Claim 6
Dependent Claim
51 words
The method as defined in claim 1, wherein the blank is barrel shaped, and the diameter of the surface thereof which will face the die upon insertion therein, is approximately equal to the smallest tooth root circle of the part of the die providing shaping of the teeth of the gear.
Claim 7
Dependent Claim
44 words
A method as set forth in claim 1, the preparing step including the providing of convexity to obtain a barrel shaped blank such that a space free from material remains between the workpiece upon insertion into the die and the bottom of the die.
Claim 8
Dependent Claim
51 words
A method as set forth in claim 1, the preparing step including the providing of convexity to the blank so that the blank sits on the cone above the bottom and a space free from material remains between the workpiece upon insertion into the die and the bottom of the die.
Claim 9
Dependent Claim
23 words
A method as set forth in claim 1, the working step carried out in two consecutive steps, with an annealing step in between.
Claim 10
Dependent Claim
35 words
A method as defined in claim 1, comprising the additional step of preparing the blank with a centrally located indentation in the surface intended to face the bottom of the die during the working step.
Claim 11
Dependent Claim
20 words
A method as set forth in claim 9, the working step including the introducing of a protrusion into the indentation.
Claim 12
Independent Claim
110 words
A method for manufacturing bevel gears comprising the steps of: preparing a workpiece with a circumferential surface having axially rotational symmetry in relation to an axis and being convexly shaped, at least in parts, and in any plane which incLudes the axis; placing the workpiece into a die so as to extend not further than into the plane of the smallest root circle in the bottom of the die to be used; and working the thus prepared workpiece by using said die having a bevel gear axes to form a bevel gear, the workpiece being positioned with its axis of symmetry coaxial to the bevel gear axis of the die.
Claim 13
Independent Claim
110 words
A method for manufacturing bevel gears comprising the steps of: preparing a workpiece with a circumferential surface having axially rotational symmetry in relation to an axis and being convexly shaped, at least in parts, and in any plane which incLudes the axis; placing the workpiece into a die so as to extend not further than into the plane of the smallest root circle in the bottom of the die to be used; and working the thus prepared workpiece by using said die having a bevel gear axes to form a bevel gear, the workpiece being positioned with its axis of symmetry coaxial to the bevel gear axis of the die.
Claim 14
Dependent Claim
37 words
The method as in claim 11, the preparing step including preparing the workpiece to be disposed on root forming ridges of the die, whereby a free space remains between the workpiece and the bottom of the die.
Claim 15
Dependent Claim
19 words
The method as in claim 12, the workpiece about tangent to the semi-height of the gear to be made.
Claim 16
Dependent Claim
10 words
The method as in claim 12, the workpiece being barrel-shaped.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |