Gear coupling

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Watt's planetary gear in the original, 1785
Animation of Watt's planetary gear

Gear coupling gears are a combination of coupling gears and gear drives . The combination or interconnection can take place as a series or parallel connection.

Examples

Watt's planetary gear

James Watt bypassed the patent on the latter, which had to be licensed at the time , when converting the lifting movements into rotary movements of a piston steam engine with an addition to the slider crank . He had the slider crank mechanism followed by a two-wheel planetary gear that the chief engineer at Boulton & Watt , William Murdoch , had designed and patented in his name by Watt in 1781: a planet gear at its rotating end firmly connected to the push rod, a sun gear concentric with the center of rotation of the Crank mounted on the frame . The revolving, non-rotating planet gear drives the sun gear (its speed of rotation is twice as high as that of the crank). The crank is not the driven part, as is usual with steam engines, but the sun gear is driven.

Three-wheel linkage

Of the gear coupling gears , the three-wheel ( gear ) coupling gear combined with a crank arm is most frequently used. It is used to generate revolving, highly uneven rotary movements, also with a detent or pilgrim step (partial reverse rotation ) for applications in textile, packaging and other machines.

One example is the drive of a paper drum in a paper turning device in printing machines . Here, the drum, rotating at high speed, performs a momentary stop after each rotation, so that the gripper turning the printed sheet has the opportunity to grasp it precisely and safely.

Behind the two gears there is a crank (barely visible), which, however, does not have to transmit any forces, but primarily serves to keep the gears at an even distance.

literature

Individual evidence

  1. ↑ Johannes Volmer (Ed.): Gear technology. Verlag Technik , 1995, ISBN 3-341-01137-4 . Pp. 323-326.
  2. ^ Watt's patent 1781
  3. ↑ Johannes Volmer (Ed.): Gear technology. Verlag Technik , 1995, ISBN 3-341-01137-4 . P. 335.

Web links

Commons : Sun and planet gear (Watt)  - Collection of images, videos and audio files