W. G. WILSON. EPICYCLIC . APPLICATION FILED JAN-5. I921. Patented Jan. 241, 1922. 2 SHEETS~SHEET l.

’ ‘_\ l/l/IIIIIIIIIIIIII/ IN w. G. WILSON. EPICYCLIC GEAR. APPLICATION FILED JAN. 5. I921. Patented Jan. 24, 1922. 2 SHEETS~SHEET 2

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I ‘STATES PAT T FM 6 E . WALTER GORDON WILSON, 01E‘ CHARTON, FARNINGHAM, ENGLAND.

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.inoaeta. ' Speci?cation of Letters Patent. Patented Jam. 24, 1922. Application 'filed January 5, 1921. Serial, No. 435,287. (GRANTED UNDER THEVJPROVISIONS OF THE ACT OF MARCH .3, 1921, 41 STAT. L, 1813.) - To all {whom it may concern: suitable for the desired gearing ratio, while Be it known that I, WALTER GORDON WIL the corresponding planet (1 which it 55 SON, a subject of the King of Great Britain with are respectively carried on studs and Ireland, and residing at Charton, Far-n 6 projecting from a disc f carried by the ingham, in the county, _of Kent, England, driven shaft 9 which transmits power to any have invented a certain new and useful lm¢ it is desired to drive such as for proved Epicyclic Gear", (for which I have example, a‘ winch'or' similar mechanism or 60 ?led application in- England No. 299,944, the Cardan shaft or 'of a motor . Dec. 1, 1919, Patent ‘No. 164,042,) 'of which Such shaft 9 is shown as being in alignment 10 the following is a speci?cation. ' Y with the drivin shaft (1, but it may, if de " This invention relates to epicyc'lic gearing sired, extend" t rough the latter shaft a. of the type in which three changes‘of speed Surrounding the planet d and mesh-. 65 in addition to a direct drive are obtained ing therewith is an internally toothed an from three groups of gears, all three. speeds nulus It which externally at k is adapted to 15 'being obtained from the planetary move recelvea band brake Z by which it may be ment of the ?rst‘ group initiated by the driv held stationary or released. as the case may ing sun and the annulus thereof: the be. . .70 ?rst speed being obtained by locking the For the second speed, the sun pinion m annulus of the ?rst roup, the second speed, Sphned on the power shaft a and the cor 20 by locking the annu us of the second group responding'planet pinions n are of appro and driving the annulus of the ?rst group priate pitch diameter, and the pins or studs by the planetary motion'of the second group, 0 for the ‘planet pinions n are carried by 75 thus compounding the two groups, and the an extension 1) of the annulus h of the ?rst third speed, by compounding the second and speed group. The planet pinions n of the 25 third groupswith the ?rst. ’ second group gear with a second internally In such arrangements as previously pro toothed annulus 9 .supported by a disc fw posed the annulus of the third speed group ?tted with a sleeve-like boss 8 surrounding 80 has been braked in’ order to secure the de the central shaft which annulus g is adapted sired third speed; but it is found that‘ such externally at t to servev as a second brake - 'so a system causes an inconveniently high speed‘ element. of the planet pinions of such group. The third speed comprises a third speed» The objectvof'this'invention is to provide group in which the studs or pins 20 of- the 85 improved means for e?ecting the compound planetary pinions o are rigidly supported by in of- the. three groups for obtaining the the disc w carrying the second annulus g. at third speed, and which will obviate the above 1 Surrounding the planet pinions of this group mentioned disadvantage. is a third internally toothed annulus w This object is attained by so arranging carried by