pinion

from Wikipedia, the free encyclopedia

The pinion is the smaller diameter of the two toothed or chain wheels in a toothed wheel , toothed belt or chain drive . With chain gears on bicycles , the driven, rear sprocket is called the pinion, with motorcycles the front, driving sprocket. The pinion is also into the transmission shaft to be integrated attachment gear: pinion shaft z. B. in clockworks in which the pinion is driven.

Working machines, motor vehicles

Differential gear : bevel gear drives ring gear

The drive motors for work machines and motor vehicles in machine and vehicle construction have i. d. Usually a higher speed than the driven shafts. In this respect, the pinion is usually the driving wheel in the gearbox (again if there are multiple gear ratios ).

In the illustration opposite, the smaller bevel gear pinion (to the left of the two tapered roller bearings ) drives the larger ring gear at the input of a differential gear .

Gear clock

In the case of wheel clocks, the term drive is common for the smaller wheel of a gear transmission stage . Pinion is an outdated term here. It's I. d. Usually the driven wheel. The speed ratio is particularly high here, which is only possible with a special tooth shape - not with the involute toothing common in mechanical engineering . The number of teeth on the pinion may be at least 6 (13 with involute teeth).

bicycle

In the case of bicycles , the designation is not used in accordance with the definition of DIN, the driving wheel is not called a pinion. A single gear on the rear wheel is usually called a ring gear , more rarely a pinion . The entirety of the sprockets is called the sprocket set , cassette or pinion set . On the front located at the bottom bracket sprocket and a rear sprocket is used for power transmission , a chain out. The driving front gear on the bike is never called a pinion, even if it is smaller than the driven gear.

literature

  • Michael Gressmann, Franz Beck, Rüdiger Bellersheim: specialist knowledge of bicycle technology. 1st edition, Verlag Europa-Lehrmittel, Haan-Gruiten, 2006, ISBN 3-8085-2291-7
  • Fritz Winkler, Siegfried Rauch: Bicycle technology repair, construction, production. 10th edition, BVA Bielefelder Verlagsanstalt GmbH & Co. KG, Bielefeld, 1999, ISBN 3-87073-131-1
  • Richard Hallet: Bicycle Maintenance-Care-Repair. 1st edition, BVA Bielefelder Verlag GmbH & Co. KG, Bielefeld, 2003, ISBN 3-87073-308-X
  • Rob van der Plas: The bicycle workshop - repair and maintenance step by step. 1st edition, BVA Bielefelder Verlaganstalt, Bielefeld, 1995, ISBN 3-87073-147-8

Web links

Individual evidence

  1. ↑ DIN 868 3.1.2: "The smaller of the two wheels of a wheel pair is referred to as a pinion or small wheel ..., the larger one as a wheel or large wheel (DIN 868 3.1.2)."
  2. ↑ Siegfried Wetzel: Clockwork technology and precision engineering
  3. ↑ Sprocket package on Fahrradmonteur.de