The buildup of a lubricating film must then be supported by design measures. In the small end bore, this is carried out—in the case of large pistons—with splash oil feeders or pressurized oil supply through the connecting rod. Oil pockets can also be used as a reservoir. Pockets, oil grooves, and the like are incorporated in the piston pin boss. 5 Wear Boundary lubrication conditions cannot be avoided under all operating conditions. Therefore, the contact between the piston pin and the small end bore and the piston pin boss bore must also have sufficient boundary lubrication properties and be wear-resistant.

0 ‰ Large-bore engines 1) relative to the outer diameter of the piston pin The piston and connecting rod geometry and the maximum pressure in the expansion stroke cycle must be considered when dimensioning the piston pin. 2 are the result. 80 Pass. 75 Pass. 85 Com. veh. Al Com. veh. , conical piston pins) Lubricating film distribution ■ ■ ■ ■ Using simplified load assumptions, analyses can be performed that, together with empirical values, enable an assessment of the operating conditions. 16). 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 .

75 Pass. 85 Com. veh. Al Com. veh. , conical piston pins) Lubricating film distribution ■ ■ ■ ■ Using simplified load assumptions, analyses can be performed that, together with empirical values, enable an assessment of the operating conditions. 16). 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 . It is assessed on the basis of empirical values for total stress and deformation. The average pin bore pressure must not exceed the threshold prescribed by the piston strength.