By MAHLE International GmbH
Due to the ever expanding requisites to be met by way of gas and diesel engines by way of CO2 aid, emission habit, weight, and repair existence, a complete knowing of combustion engine elements is key this present day. it truly is now not attainable for a certified in car engineering to control with out the corresponding information, even if that's within the box of layout, improvement, checking out, or upkeep. This technical e-book offers in-depth solutions to questions about layout, construction, and machining of cylinder parts.
¿ Piston rings
¿ Piston pins and piston pin circlips
¿ Connecting rods
¿ Crankcase and cylinder liners
¿ Engineers in engine improvement and maintenance
¿ teachers and scholars within the parts of mechanical engineering, engine expertise, and automobile development
¿ an individual drawn to technology
The MAHLE staff is without doubt one of the best 30 automobile providers and the globally major producer of parts and structures for the interior combustion engine and its peripherals.
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Additional resources for Cylinder components: Properties, applications, materials
Consideration must be given to the fact that due to the difference in thermal expansion of the piston–piston pin–connecting rod system, the clearance can be larger for a warm engine than at installation and smaller at low temperatures. The temperature dependence of the clearance between the piston pin and small end bore is generally disregarded. 1) in gasoline engines, differentiation must be made between a “ﬂoating” pin and a piston pin with a shrink ﬁt in the small end bore. A piston pin with a ﬂoating design is the standard design and is the variant that can be loaded highest, speciﬁcally in the pin boss.
Therefore, the contact between the piston pin and the small end bore and the pin boss bore must also have sufﬁcient boundary lubrication properties and be wear-resistant. This can be achieved easily with high surface quality and hardness of the piston pin. They are therefore case-hardened or nitrided. In the case of particularly high requirements for the surface, such as in motorsport, or if a non-bushed connecting rod is used, the sliding characteristics (friction, wear resistance) can be signiﬁcantly improved by an additional PVD or DLC coating (physical vapor deposition, PVD; diamond-like carbon, DLC).
The bearing loads occurring in the engine describe the mechanical and tribological requirements for the bearing. Material selection is always the result of a compromise among all the properties, which are often contradictory in nature. 1. 1) and are used as an aid in material selection. 8, with a cyclically changing load while simultaneously rotating the shaft. The bearings are lubricated with oil during the test run. Bearing damage, such as crack formation, can thus be traced back particularly to hydrodynamic bearing loads.