planet-wheel

In some cases, particularly when annular wheels are used, the train-arm may become very short, so that it may be impossible to mount the planet-wheel in the manner thus far represented, upon a pin carried by a crank.

Scientific American Supplement, No. 470, January 3, 1885 Various

The action of a complete epicyclic train involves virtually and always the action of two suns and two planets; but it has already been shown that the two planets may merge into one piece, as in Fig. 10, where the planet-wheel gears externally with one sun-wheel, and internally with the other.

Scientific American Supplement, No. 470, January 3, 1885 Various

But in attempting to apply this formula in analyzing the action of an incomplete train, we are required to add this motion of the train-arm, not only to that of a sun-wheel, but to that of a planet-wheel.

Scientific American Supplement, No. 441, June 14, 1884. Various

This consists of a fixed sun-wheel A, engaging with a planet-wheel B of the same diameter.

Scientific American Supplement, No. 441, June 14, 1884. Various

Thus the formula leads to the surprising conclusion, that when A is fixed and T revolves, the planet-wheel B will revolve about its axis twice as fast as T moves, in one case, while in the other it will not revolve at all.

Scientific American Supplement, No. 441, June 14, 1884. Various

Now it happens that the only examples given by Prof. Willis of incomplete trains in which the axis of a planet-wheel whose motion is to be determined is not parallel to the central axis of the system, are similar to the one just discussed; the wheel in question being carried by a secondary train-arm which derives its motion from a wheel of the primary train.

Scientific American Supplement, No. 441, June 14, 1884. Various