Abstract
The running-in behavior and the associated transient friction characteristics of a piston ring with different surface treatments are experimentally evaluated using a custom-made engine testing apparatus. Results are reported for a series of running-in and steady-state experiments on piston rings with different combinations of coated and textured surfaces. Comparisons are provided between five different types of piston rings: (1) with no textures; (2) with textures only; (3) with coating only; (4) first textured and then coated; and (5) first coated and then textured. A combination of the texturing and coating showed 12.5% improvement in the frictional behavior and up to 50% improvement in break-in time compared to cases when only one surface treatment was applied.
Highlights
Manufacturers of internal combustion engines continuously face the challenging task of finding means to reduce fuel consumption and emissions in an attempt to improve the engine efficiency.Research shows that frictional loss in an internal combustion engine is the most important factor in determining the fuel economy and performance of a vehicle
About 33% of fuel in a car is used to overcome friction [1], and 50% of the friction losses in an internal combustion engine is due to the piston/cylinder system, of which 70–80% comes from the piston rings [2]
Plasma coating and micro-pockets with optimal geometries were selected based on a previous study [15] and fabricated on the running surface of compression rings using a laser
Summary
Manufacturers of internal combustion engines continuously face the challenging task of finding means to reduce fuel consumption and emissions in an attempt to improve the engine efficiency. Research shows that frictional loss in an internal combustion engine is the most important factor in determining the fuel economy and performance of a vehicle. About 33% of fuel in a car is used to overcome friction [1], and 50% of the friction losses in an internal combustion engine is due to the piston/cylinder system, of which 70–80% comes from the piston rings [2]. Improving the tribological behavior of piston rings can have a major impact on the engine performance with concomitant benefits of reducing fuel and oil consumption. The performance of textured surfaces is affected by the geometric characteristic of textures and studies have shown that dimensional uncertainties due to manufacturing tolerances can affect the performance of textures [3,4]
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