US3763598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making or testing involute helical gears and machine therefor
Assignee: BHS Bayerische Berg Hutten und Salzwerke AG
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Filing: 1971-08-27
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Granted: 1973-10-09
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Expires: 1991-08-27
Abstract
Abstract The method of making or testing an involute helical gear comprises the steps of generating a back and forward motion of the tooth-forming tool or of a tracer tool relative to the gear and along the lines of contact on the tooth flank while the gear moves in rolling contact relative to the tool or tracer, and of imparting an additional feed motion to either the tool or the gear in a direction parallel to the direction of the back and forward motion from the moment when the lines of contact of the tool have become substantially equal in length to the length of the executed strokes. The lines of contact are the lines along which two meshing gears are in driving engagement with one another which lines extend transversely across each tooth flank, and the utmost length of the back and forward tool strokes is made equal to the longest lines of contact on the tooth flank plus some idle travel near the upper and lower points of reversal of motion.
Inventors
- 👤 W Hofler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:56
CPC Classifications
B; B23; B23F; B23F23/00; B23F23/12; B23F23/1218; B23F5/00; B23F5/02; B23F5/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
164 words
A method of making or testing an involute helical gear comprising the steps of a. generating back and forward strokes of a tool relative to the workpiece along the lines of contact on the tooth flank to be shaped while the workpiece moves in rolling contact relative to the tool, the length of the back and forward strokes being at the most equal to the maximum length of the lines of contact on the tooth flank plus idle travel near the upper and lower points of reversal of motion, b. producing an additional relative feed motion between the tool and the workpiece in a direction parallel to the direction of the tool strokes from the moment when the lines of contact become substantially equal in length to the length of the executed strokes, for gradually shifting the area covered by the strokes on the tooth flank, and c. varying the length of the tool strokes in dependence on the rolling distance of the workpiece.
Claim 2
Independent Claim
164 words
A method of making or testing an involute helical gear comprising the steps of a. generating back and forward strokes of a tool relative to the workpiece along the lines of contact on the tooth flank to be shaped while the workpiece moves in rolling contact relative to the tool, the length of the back and forward strokes being at the most equal to the maximum length of the lines of contact on the tooth flank plus idle travel near the upper and lower points of reversal of motion, b. producing an additional relative feed motion between the tool and the workpiece in a direction parallel to the direction of the tool strokes from the moment when the lines of contact become substantially equal in length to the length of the executed strokes, for gradually shifting the area covered by the strokes on the tooth flank, and c. varying the length of the tool strokes in dependence on the rolling distance of the workpiece.
Claim 3
Dependent Claim
191 words
A machine for making or testing an involute helical gear, comprising in combination a. a stand; b. a table connected to said stand for mounting the workpiece to be machined thereon, means for simultaneously rotating said table and moving it laterally so that said work piece performs a rolling motion; c. guide ways on said stand, and a stroke slide mounted in the guide ways; d. means for moving said stroke slide back and forward in said guide ways; e. a feed slide, means mounting said feed slide on said stroke slide for displacement thereon in a direction parallel to the direction of movement of said stroke slide; f. a tool mounted on said feed slide, said tool being adapted to engage along lines of contact on the tooth flank of said workpiece when said stroke slide performs said back and forward movement and said workpiece performs said rolling motion; g. means for controlling the feed motion of said feed slide in dependence on the lateral displacement of said machine table; and h. means to vary the length of the tool strokes in dependence on the rolling distance of the workpiece.
Claim 4
Dependent Claim
191 words
A machine for making or testing an involute helical gear, comprising in combination a. a stand; b. a table connected to said stand for mounting the workpiece to be machined thereon, means for simultaneously rotating said table and moving it laterally so that said work piece performs a rolling motion; c. guide ways on said stand, and a stroke slide mounted in the guide ways; d. means for moving said stroke slide back and forward in said guide ways; e. a feed slide, means mounting said feed slide on said stroke slide for displacement thereon in a direction parallel to the direction of movement of said stroke slide; f. a tool mounted on said feed slide, said tool being adapted to engage along lines of contact on the tooth flank of said workpiece when said stroke slide performs said back and forward movement and said workpiece performs said rolling motion; g. means for controlling the feed motion of said feed slide in dependence on the lateral displacement of said machine table; and h. means to vary the length of the tool strokes in dependence on the rolling distance of the workpiece.
Claim 5
Dependent Claim
143 words
A machine as claimed in claim 2, wherein said means for controlling the feed motion of said feed slide comprises a. an electric motor mounted on said stroke slide; b. a stationary but rotatable spindle on said stroke slide driven by said motor and engaging said feed slide in an internally threaded socket; c. a cam mounted stationarily on said machine stand, said cam having portions of differing slope; d. a cam follower in sliding contact with said cam and guided in said machine table so as to be laterally movable therewith while, at the same time being movable by said cam in a direction different from the direction of the table movement; and e. electric means actuated by said cam follower and controlling the power supply of said electric motor in dependence on the displacement of said cam follower by said cam.
Claim 6
Dependent Claim
149 words
A machine for making or testing an involute helical gear comprising in combination a. a stand; b. a table connected to said stand for mounting the workpiece to be machined thereon, means for simultaneously rotating said work table and moving it laterally so that said workpiece performs a rolling motion; c. a stroke slide mounted in guide ways on said stand; d. means for moving said stroke slide back and forward in said guide ways; e. a Tool mounted on said stroke slide, said tool being adapted to engage along lines of contact on the tooth flank of said workpiece when said stroke slide performs said back and forward strokes and said workpiece performs said rolling motion; and f. means for shifting the range and length of strokes of said stroke slide gradually in the direction of the strokes in dependence on the lateral displacement of said machine table.
Claim 7
Dependent Claim
149 words
A machine for making or testing an involute helical gear comprising in combination a. a stand; b. a table connected to said stand for mounting the workpiece to be machined thereon, means for simultaneously rotating said work table and moving it laterally so that said workpiece performs a rolling motion; c. a stroke slide mounted in guide ways on said stand; d. means for moving said stroke slide back and forward in said guide ways; e. a Tool mounted on said stroke slide, said tool being adapted to engage along lines of contact on the tooth flank of said workpiece when said stroke slide performs said back and forward strokes and said workpiece performs said rolling motion; and f. means for shifting the range and length of strokes of said stroke slide gradually in the direction of the strokes in dependence on the lateral displacement of said machine table.
Claim 8
Dependent Claim
49 words
A machine as claimed in claim 4, wherein said means for moving said stroke slide back and forward in said guide ways comprise a cylinder/piston-aggregate of which the cylinder is rigidly connected to said machine stand while the piston and the piston rod are linked to said stroke slide.
Claim 9
Dependent Claim
54 words
A machine as claimed in claim 4, wherein said means for moving said stroke slide back and forward in said guide ways comprise a spindle drive including a spindle mounted stationarily but rotatably on said machine stand and a screw socket engaged by said spindle, said screw socket being part of said stroke slide.
Claim 10
Dependent Claim
106 words
A machine as claimed in claim 4, wherein said means for shifting said range of said strokes comprise a. two stop members arranged adjustably on said stand; b. an electric switch mounted on said stroke slide, said switch being provided with a switch lever extending into the space between said stop members and being operated thereby; c. an electric motor for displacing said stop members in the direction of movement of said stroke slide, and d. means for actuating said electric motor in dependence on the lateral displacement of said machine table, thereby displacing said stop members relative to said machine stand and said electric switch.
Claim 11
Dependent Claim
98 words
A machine as claimed in claim 7, wherein said means for actuating said electric motor comprise a. a cam mounted stationarily on said machine stand; b. a cam follower in sliding contact with said cam and guided in said machine table so as to be laterally movable therewith while, at the same time, being movable by said cam in a direction different from the direction of the table movement; c. electric means actuated by said cam follower and controlling the power supply of said electric motor in dependence on the displacement of said cam follower by said cam.
Claim 12
Dependent Claim
177 words
A machine for making or testing an involute helical gear having a toothed flank comprising a workpiece carrying member and a tool carrying member, means to produce relative movement between the workpiece carrying member and the tool carrying member to generate back and forward strokes of the tool relative to the workpiece along the lines of contact on the workpiece while the workpiece moves in rolling contact relative to the tool, the relative motion between the tool and the workpiece carrying member being at most equal to the maximum length of the lines of contact on the tooth flank of a workpiece carried by the member plus idle travel near the points of reversal of motion, and means controlled by the position of the workpiece carrying member to impart an additional relative feed motion between the tool and the workpiece in a direction parallel to the direction of the tool strokes for gradually shifting the area covered by the strokes on the tooth flank and the length of such area in the direction of the tool strokes.
Claim 13
Dependent Claim
177 words
A machine for making or testing an involute helical gear having a toothed flank comprising a workpiece carrying member and a tool carrying member, means to produce relative movement between the workpiece carrying member and the tool carrying member to generate back and forward strokes of the tool relative to the workpiece along the lines of contact on the workpiece while the workpiece moves in rolling contact relative to the tool, the relative motion between the tool and the workpiece carrying member being at most equal to the maximum length of the lines of contact on the tooth flank of a workpiece carried by the member plus idle travel near the points of reversal of motion, and means controlled by the position of the workpiece carrying member to impart an additional relative feed motion between the tool and the workpiece in a direction parallel to the direction of the tool strokes for gradually shifting the area covered by the strokes on the tooth flank and the length of such area in the direction of the tool strokes.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |