By MAHLE GmbH (eds.)
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Additional info for Cylinder components: Properties, applications, materials
1 General Piston pins must meet the following requirements: ■ Sufﬁcient strength and toughness to withstand the loads without damage ■ High surface hardness, in order to achieve favorable wear behavior ■ High surface quality and shape accuracy for optimal ﬁt with its sliding partners, the piston and connecting rod ■ Low weight, in order to keep inertia forces minimal ■ Stiffness must be matched to the piston design, in order to avoid overloading the piston. Despite these sometimes contradictory requirements, piston pin manufacture must be as simple, and thus economical, as possible.
8). The coatings are built up in layers, and the layer hardness is adapted to the contact loads and materials making contact with the piston pin. 23). 5 μm. The layers with high hardness values are used for sliding contact surfaces made of abrasive materials, such as the aluminum piston alloy, or for high contact pressures. 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.
MAHLE piston pins are designed, manufactured, and applied on the basis of the ISO 18669 standard. 6. 2. 4: Hardness penetration depths, dimension in mm Wall thickness a [mm] Case depth Outside Min. 5– < 2 2–3 Inside min. Code X Nitride depth Outside and inside together Max. Outside min. Inside min. 35 · a – Comment 1: the limit hardness used in determining the case depth is Hs 550 HV. Comment 2: for piston pins with limited change in volume, identification mark V, the limit hardness is Hs 500 HV.
Cylinder components: Properties, applications, materials by MAHLE GmbH (eds.)