Download Cylinder components: Properties, applications, materials by MAHLE GmbH (eds.) PDF

Such a fatigue strength map must be determined for each material in use. Its limit lines correspond to the safety factor S = 1. The permissible minimum safety factor is determined according to the requirements and expected loads for each area of application, such as passenger cars, commercial vehicles, or motorsport. Clearance between the piston pin and the piston pin boss or small end bore should be selected such that scuffing cannot occur between the contact points with the piston and the connecting rod.

Coatings of this type allow ultrahigh contact pressures and reduce friction. 6 Weight The total oscillating mass can be reduced by reducing the piston pin mass. The proportion of oscillating mass made up by the piston pin can be between 10 and 30%. 8) has been accepted as the standard design. It optimally fulfills requirements with regard to simple geometry and economical manufacture. 9). 10). The wall thickness of the piston pin is reinforced specifically in the connecting rod area, while the ends of the piston pin contribute to mass reduction with a conical design.

7 2 Piston pins and piston pin circlips Component testing Piston pin test bench Piston pins are often tested on servo-hydraulic test machines and resonance pulsators. A simulation of the rotational motion of the piston pin is generally not included. As previously indicated, the loads on the piston pin in a floating configuration cannot be tested with sufficient accuracy using this method. 24). With this test installation, the alternating loads on the rotating piston pin can be reproduced, with bending and ovalization.