... in an engine are the piston assembly, valve train, and bearings. There are two main types of frictional losses associated with these parts: shear loss and metal to metal friction. Thick oil in an engine will reduce the boundary friction but will increase shear losses whereas thin oil will reduce shear friction...

... in an actual application. The performance of a hydraulic axial piston pump with DLC-coated piston shoes was evaluated in a newly designed, dedicated hydraulic test system using fully formulated biodegradable, synthetic ester oil. For comparison, an equal but separated hydraulic system with a conventional...

...V. Dunaevsky; J. Rudzitis This technical brief clarifies origins of the piston ring conformability bounds presented by Dunaevsky (1990, Tribol. Trans. 33(1), pp. 33–40) and provides their correct expression. The subject has strong practical significance in the field of piston engines...

...Guido Belforte; Andrea Manuello; Luigi Mazza The cross section of an elastomer seal for pneumatic actuator pistons was optimized to minimize the friction force exchanged with the cylinder bore. The new seal geometry was developed using a finite element numerical model which takes material...

...Y. Kligerman, Mem. ASME; I. Etsion, Fellow ASME; A. Shinkarenko An analytical model is developed to study the potential use of partial laser surface texturing (LST) for reducing the friction between a piston ring and cylinder liner. The hydrodynamic pressure distribution and the time-dependent...

...Riaz A Mufti; Martin Priest Piston-assembly friction measurement has been carried out on a single-cylinder gasoline engine using the IMEP (indicated mean effective pressure) method at realistic engine speeds and loads without any major engine modifications. Instantaneous and mean piston-assembly...