Gear train

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Three subgroups of gear trains of a tower clock
Middle: Movement (escapement wheel missing)
Left: Hour striking mechanism
Right: Quarter hour striking mechanism

The collective term gear train is used in clocks to describe all of the gearwheel stages contained in a mechanical clockwork . In the case of pocket and wristwatches , the gear train occasionally refers to the entire clockwork, but it can happen that the handwork, which also contains gear transmission stages, is not considered to be part of the clockwork. In the narrower sense, the gear train is identical to the walking gear . Another gear train assembly is the striking mechanism .

description

In clocks, a gear train is generally understood to be a collection of so-called larger gears and so-called smaller drives for energy transmission, which lie between the drive and the desired function ( gear regulator , display and striking mechanism release). Most train wheels in a watch have a translation into "Fast" ( speed increases, torque smaller). The only exceptions are the dials and frames .

The two most important gear trains of a clockwork in terms of assemblies are:

  • Walking mechanism
    See also the main article walking mechanism .
    The gear train of the movement is used to transmit power from the drive to the gear regulator. In a wrist or pocket watch, the gear ratio R is a multiplicative result of the individual gear ratios from the minute wheel to the third wheel (R = 6), from the third wheel to the second wheel (R = 10) and finally to the escape wheel drive (R = 10 at 10 semi-oscillations / sec .) together. At 10 half oscillations per second, corresponding to 36,000 half oscillations per hour, the total transmission ratio is 600.
  • Percussion
    See also main article percussion (clock) .
    The striking mechanism is an independent gear train with the help of which the time is communicated as a clock strike in addition to the visual display. The respective striking mechanism function is triggered by the walking mechanism.

literature

  • Friedrich Assmus: Technical drives including clocks. Springer, Berlin et al. 1958.
  • Otto Böckle, Wilhelm Brauns: Textbook for the watchmaking trade. Work skills and materials. 8-10 Edition. Wilhelm Knapp, Halle (Saale) 1951 (reprint, edited by Michael Stern. Heel, Königswinter 2010, ISBN 978-3-86852-288-4 ).
  • Hermann Brinkmann: Introduction to watchmaking (= The watchmaking school. Vol. 2). 10th unchanged edition. Wilhelm Knapp, Düsseldorf 2005, ISBN 3-87420-010-8 .
  • George Daniels : Watchmaking. Updated 2011 edition. Philip Wilson Publishers, London 2011, ISBN 978-0-85667-704-5 .
  • Günter Krug: Mechanical watches. Individual parts, assemblies, materials and auxiliary materials. VEB Verlag Technik, Berlin 1987, ISBN 3-341-00356-8

Web links

Individual evidence

  1. ↑ Lukas Stolberg: Lexicon of the pocket watch. 4th, completely revised edition. Carinthia-Verlag, Klagenfurt 1995, ISBN 3-85378-423-2 , p. 181.
  2. ↑ Georges-Albert Berner: Illustrated specialist dictionary of watchmaking. Keyword gear train. Retrieved January 28, 2012.