Overload protection for transmission system with planetary-gear train
OwnerFritz D. Ellerinventor
Life of this patent
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Abstract
The sun gear and the planet carrier of a planetary-gear train are connected with respective shafts, one of them driven and the other coupled with a load, while the ring gear is resiliently anchored to a surrounding housing so as to be rotatable with reference thereto in the event of an overload. Depending on the direction of relative rotation, a control member coupled with the ring gear actuates one of two switches or switch groups to generate an alarm signal or to take corrective action.
Claims12
In a transmission system comprising an input shaft driven by a power source, an output shaft coupled with a load, and a planetary-gear train including a sun gear connected with one of said shafts, a planet carrier connected with the other of said shafts and a ring gear disposed in a stationary housing,
- the combination therewith of:
- yieldable retaining means tending to hold said ring gear in a predetermined position relative to said housing;
- control means entrained by said ring gear;
- first and second position-sensing means secured to said housing and juxtaposed with said control means for detecting a relative rotation of said ring gear beyond respective limits on opposite sides of said predetermined position;
- and
- first and second overload-signaling means respectively controlled by said first and second position-sensing means for indicating the sense of deviation of said ring gear from said predetermined position.
Dependencies are inferred from the claim text.