Piston-Ring-Liner Design for Low Oil Consumption
An increase in oil consumption was predicted to occur with the low-tension oil control ring design, which could be mitigated either by the introduction of a negative static twist on the second ring, or by the implementation of the skewed barrel top ring design.
02/06/2010 · The Evolution of Diesel Piston Designs
During the calculation, on one hand the gas pressure load and the inertia force are considered, on the other hand, when the piton moves up and down, the side force also need to be considered. The contacts between pin and bore, piston skirt and liner, connecting rod and pin are considered. In solver module, special parameters was used to calculate the temperature field and stress field. In the meantime, the residual series curve was used to track the calculation process, finally we get temperature field, and stress field, . The temperature calculation of results field are shown in Fig. (). From the calculation of the temperature field results, the temperature of the critical position of the piston, as combustion bowl rim, the top surface of piston and the first ring groove are higher, the highest temperature of the combustion bowl rim reached 323 degrees.
Proposal) by Liang Liu Sloan Automotive Lab, MITThe Evolution of Diesel Piston Designs - Engine Builder 02.06.2010 · The Evolution of Diesel Piston Designs.
Piston design and shape greatly effect how an engine ..
The goal of this study was to develop low-friction piston ring designs to improve engine efficiency, without adversely affecting oil consumption, blowby, wear, or cost.
Modeling the Structural Behavior of the Piston Rings …
Using an existing piston ring friction and lubrication model, the main contributors to friction in modern internal combustion engines were identified as the top ring around top dead center of the compression/expansion strokes and the oil control ring throughout the engine cycle.
Challenges Involved in Piston Top Ring Designs for …
The measured blowby gasmeasurements and the model predictions were compared, and were found tobe in reasonable agreement over a wide range of engine operatingconditions and ring sets.
Challenges Involved in Piston Top Ring Designs ..
Model predictions indicated that the top ring friction could be reduced by implementing a skewed barrel profile design or an upward piston groove tilt design, and oil control ring friction could be reduced by decreasing ring tension.
in Piston Top Ring Designs for Modern SI Engines.
An increase in groove wear was predicted to occur with the upward piston groove tilt design, which could be eliminated by the introduction of a positive static twist on the top ring.
in Piston Top Ring Designs for Modern SI Engines
Model predictions indicated that by combining the low-friction designs, a reduction in piston ring pack friction of 30-35% could be achieved, without an increase in blowby, wear, or oil consumption.