Archives of Past Exhibits:Nippon Piston Ring
2014 JSAE Automotive Engineering Exposition
Piston RingsDiamond Like Carbon coating (DLC coating) is widely used in the automotive market to achieve friction reduction on engine components.
Dimple-Based Friction Optimized Surface Technology LinerMicro-dimples are formed on the inner peripheral sliding surface of the cylinder liner, helping reduce the friction between piston rings and cylinder liners.
Tokyo Motor Show 2013
Dimple-based Friction Optimized Surface Technology (Cylinder Liners)-Co-developed with Hino Motors. -By forming a dimpled-surface on the cylinder liner inner surface, it was able to reduce friction resistance between the cylinder liner and piston rings, and thereby increased the piston's compression efficiency. This improvement leads to a 3.2% gain in fuel economy on small diesel engine, and it is expected to double the effect on gasoline engines to around 6% improvement.
Assembled Type Sintered CamshaftsInstalled vehicles: Subaru Vehicle with BOXER engine. Nissan "Skyline" and other models with VQ35 engine.
Piston RingsInstalled vehicles: Daihatsu "Mira e:S" -NPR supplies Piston Rings to major OEMs around the world almost evenly and achieves global market share of more than 20% which places NPR top of the market share. (according to the Company's own survey)
2013 JSAE Automotive Engineering Exposition
Tokyo Motor Show 2011
Piston ring set for latest fuel-efficient gasoline engineInstalled vehicles: Nissan "Serena", "Skyline"
Piston ring set for direct injection turbo charged gasoline engineInstalled vehicles: Nissan "Juke"
Tokyo Motor Show 2005
:Great reduction of pumping loss by controlling the air-intake with valve lift volume which replaces the movement of throttle valve.
:Continuous variability of valve lift became reality by rocking movement of control lever over rocker arm.
Core technology products for CVVA
-Assembly of Sintered Cam Shaft
-Assembled Cam Shaft
-Sintered Valve Sheet