Drive (clockwork)
The drive (also out of date pinion ) is the smaller of two gears in mechanical clockworks , which together form a gear train. The larger of the two wheels is generally called a gear to distinguish it .
Compared to the gear, the drive usually only has as many teeth ( wings ) as are at least necessary for the function of the gear. In clocks, the drive is mostly driven by a gear with usually more than 20 teeth.
Designs
There are two types of construction:
- Hollow drive for rack toothing and
- Full drive for cycloid toothing or drive flank toothing
Hollow drive
The hollow drive (also called lantern drive ) consists of pins between two circular metal or wooden discs. The pins form the wings, the teeth of the associated gear mesh in the space between the pins. Hollow drives are easier to manufacture than full drives with simple production facilities. They were therefore traditionally used in tower clocks and wooden weight clocks (e.g. Black Forest clocks ).
The gears belonging to the hollow drives have a special tooth shape. It is therefore not possible to combine hollow drives with gears for full drives or vice versa.
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Full drive
The full drive is the most common form in mechanical watch movements. It is cut or drawn from solid round steel and thus forms a unit with the shaft or its bearing parts. Because of the large gear ratios, cycloid gears are used almost exclusively , no involute gears .
Other shoots
Components of a mechanical wristwatch with manual winding are also the winding mechanism and the pointer actuator .
swell
- Hermann Brinkmann: Introduction to the watchmaking apprenticeship. Wilhelm Knapp Verlag, 1980
- CJ Linnartz: The watchmaker's technical drawing. Wilhelm Knapp Verlag, 1980
- Fritz von Osterhausen: Callweys watch lexicon. Callwey, Munich 1999, ISBN 978-3766713537 .
Individual evidence
- ^ Helmut Kahlert , Richard Mühe , Gisbert L. Brunner : Wristwatches: 100 years of development history. Callwey, Munich 1983; 5th edition, ibid. 1996, ISBN 3-7667-1241-1 , p. 48.