US Patent: 1,190,391
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| Means for Generating and Cutting Irregular Gears
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Patentee:
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| Edwin R. Fellows (exact or similar names) - Springfield, Windsor County, VT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 22, 1915 |
| Granted: |
Jul. 11, 1916 |
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Joel Havens
"Vintage Machinery" entry for Fellow Gear Shaper Co.
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Description: |
| Wright, Brown, Quinby & May - patent attorneys
The present invention relates to the art of generating and cutting teeth on irregular gears, by which I mean gears having teeth arranged on a pitch line which is otherwise than concentric .with the axis about which either the- gear is designed to rotate or pinion meshing with the gear is designed to revolve. In my application for patent, Serial Number 858,192 filed August 22. 1914, I have illustrated a means for generating and cutting the teeth of such a gear wherein the gear is held by a floating holder and is given a movement, relatively to a tooth-generating cutter during the generating and cutting operation, which is similar to the relative movement between the gear and the pinion with which it is designed to mesh. The apparatus and means which form the subject of the present invention are of the same general nature as those shown in my application aforesaid, but possess modifications and refinements having for their object to accomplish the desired end with less mechanical resistance and with possibly greater accuracy.
Briefly stated the principal object of the present invention is to provide a means for so moving an irregular gear blank transitively and. revolubly, in connection with generating motion of a gear-shaped planing cutter, or other cutter capable of cutting gear teeth of the desired form, during, the editing operation as to produce exactly the same relative movements between the blank the axis of the blank, as take place between the gear and the standard pinion with which it is designed to run in mesh, and to effect this movement in a positive manner and with the minimum of motional or other resistance. The particular gears of which the teeth are to be generated and cut by the present apparatus include an internal irregular gear of four equal and symmetrically arranged lobes, and an external gear of generally elliptical shape and of smaller area than the space surrounded by the teeth of the internal gear; which is placed in such space, and meshes with a number of floating pinions, which latter also mesh with the internal gear and are adapted to have a planetary motion when either the external gear or the internal gear is rotated relatively to the other. One form of the moans which I have adopted and desire to protect in the present application for giving the desired movements to the gear blank consists of a set of master gears and pinions, to one of which master gears the blank is connected, and of which one of the pinions is used as the driver for giving the generating movement to the gear being cut, in connection with a cutter which may be of any sort capable of generating the forms of gear teeth at the same time that it cuts them, by a combination of relative movements between the cutter and the work piece. One, form of such a cutter, here illustrated, has peripheral projections shaped similarly to the teeth of a spur gear and arranged on a pitch line approximately equal in diameter to the pitch, line of such driving pinion. Other forms of means for the same purpose herein illustrated comprise co-acting elements connected with the master gear and the table on which the work holder is supported for positively shifting the work holder when receding portions of the pitch line of the master gear approach the driving pinion. Essentially the same means, with minor variations adapted to the particular work in hand, may be provided and arranged for cutting any shape or character of internal or external irregular gear, wherefore the particular description, which follows of the embodiment of such means adapted to a particular purpose is not to be taken as limiting the present invention to the particular mechanism described, or otherwise, except in accordance with the appended claims.
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