Business
Precision Machined Parts
NPR-RIKEN offers a wide range of highly functional, durable, and highly accurate precision-machined parts, using material and surface treatment technologies we have cultivated over many years.
Turbo Charger Seal Rings
What are the turbo charger seal rings functioning?
Turbo seal rings are seal rings used on the turbine/compressor shaft of turbochargers.
They exhibit excellent sealing properties and wear resistance even under high temperature and pressure conditions.
Features
・Material technology that can withstand ultra-high rotational speeds
・Design technology to minimize oil and gas leaks
・Production technology that pursues dimensional accuracy
・Low-cost technology supplied to the world
Valve Lifter
What are the valve lifters functioning?
The valve lifters have a DLC coating on the surface that comes into contact with the camshaft, achieving extremely low friction resistance.
This keeps the internal operation of the engine smoother, contributing greatly to improved response, fuel economy, and longer life.
Features
By applying textured grooves to the DLC surface using an ultrashort pulse laser, we improve low-friction performance and durability at low speeds, in the boundary lubrication and mixed lubrication ranges. This technology also enables compatibility with lower viscosity engine oils, contributing to improved fuel economy.
Friction evaluation results
Achieves approximately 13% lower friction than DLC lifters
Texture reduces friction
Achieved through "tribofilm formation" and "improved oil film formation on sliding parts"
Improved oil film formation on sliding parts
The lubrication condition of the flat areas is improved from mixed lubrication to hydrodynamic lubrication by supplying oil scraped out from the textured grooves to the flat areas themselves.
Aluminum Vane
What are the aluminum vanes functioning?
Aluminum vanes for car air conditioner compressors that are both lightweight and durable. Our aluminum vanes use an original high-performance aluminum alloy (ASCM20-5Fe) that achieves excellent wear resistance and self-lubrication.
Features
・We have continued our research into lightweight materials that can perform reliably even in harsh environments, and have succeeded in developing an original high-performance aluminum alloy that contains large amounts of silicon and transition metals, something that is difficult to achieve with general-purpose aluminum alloys.
・Our original high-performance aluminum alloy is used in vanes for car compressors, and is expected to be used in various mechanical parts for automobiles and motorcycles.
Features of our original high-performance aluminum alloy
・Weight is one-third that of steel
・Strength exceeds that of duralumin, which is used in the aircraft industry
・High rigidity not possible with general-purpose aluminum alloys
・Thermal expansion can be controlled through material design
About our original high-performance aluminum alloy
The original high-performance aluminum alloy has a high degree of design freedom because it is made from powder as the starting material, and because the structure is fine even when large amounts of Si and transition metals are added, it exhibits higher rigidity and high-temperature tensile strength than conventional aluminum alloy materials.
Exhibits high-temperatur
strength High Young's modulus
Low coefficient of thermal expansion
Wide range of additives
Material structure of original high-performance aluminum alloy (ASCM2O-5Fe)
・Exhibits higher rigidity than conventional aluminum alloys due to the addition of large amounts of Si and transition metals (Fe, Ni, etc.)
・Materials with excellent high-temperature strength properties can be obtained by adding a large amount of Si or transition metals.
・ASCM20-5Fe (20%Si-5%Fe) exhibits strength greater than ultra-super duralumin at high temperatures (150℃ or higher)
・Exhibits tensile strength of 400MPa or more even at high temperatures (150℃)
Cylinder Liner
The cylindrical cylinder liner, which is set in the cylinder block, forms the inner part of the engine's combustion chamber. Cylinder liners include wet liners, where cooling water directly contacts the outer surface, and dry liners, which are press-fitted into the machined block.
We boast a long track record, particularly in thin-walled dry liners for commercial diesel engines. The "dimple liner," which contributes to improved fuel efficiency, is our unique technology.
