By MAHLE GmbH (Ed.)
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Additional info for Cylinder Components
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. Cracks in the bearing material propagate progressively. Visual evaluation takes place after 107 load cycles. The ranking of bearing materials is determined by varying the speciﬁc bearing loads. 9 shows the spread of the test results for two bearing materials.
57 min. – Rockwell HRC 1) 1) Case depth min. 6: Volume change after heat resistance test, dimensions in mm Test conditions After 4 h at 180 °C After 4 h at 220 °C Max. 5 Piston pin materials MAHLE piston pins are manufactured from high-quality case-hardened or nitrided steels. Case or nitride hardening yields good toughness in the core and high surface hardness with good wear behavior. Piston pins made of nitrided steel are especially noteworthy for their outstanding wear resistance. The enrichment of the edge zones with carbon or nitrogen causes an increase in volume, which leads to compressive stresses in the piston pin edge layers.
75 Pass. 85 Com. veh. Al Com. veh. , conical piston pins), N lubricating ﬁlm distribution. Using simpliﬁed load assumptions, analyses can be performed that, together with empirical values, enable an assessment of the operating conditions. 17). In addition to the deformation due to bending and ovalization, the “total stress” is determined from the bending stress VB and the stress due to ovalization VA . V ges = V A2 + V B2 (2-1) It is assessed based on empirical values for total stress and deformation.
Cylinder Components by MAHLE GmbH (Ed.)