Cylinder bore

from Wikipedia, the free encyclopedia

The inner diameter of a cylinder , specifically the cylinder of a reciprocating engine, is called a cylinder bore or bore for short . The piston diameter is slightly smaller than the cylinder bore. Since pistons in internal combustion engines do not have an exactly circular cross-section, the piston diameter is also dependent on the measuring direction.

In the German standard DIN 1940 "Combustion Engines", the formula symbol D and the unit of measurement mm are recommended for the cylinder bore .

The bore, the piston stroke s and the number of cylinders determine the displacement of an engine.

The ratio of piston stroke and cylinder bore is - also according to DIN 1940 - the stroke ratio .

The term quadrathuber (from the English square engine ) is mainly used in popular scientific publications for engines with s / D = 1.

literature

  • Richard van Basshuysen, Fred Schäfer: Handbook internal combustion engine. Basics, components, systems, perspectives. 3rd edition, Friedrich Vieweg & Sohn Verlag / GWV Fachverlage GmbH, Wiesbaden, 2005, ISBN 3-528-23933-6 .
  • DIN 1940 standard "Combustion Engines", various editions from July 1946.