Products
Precision Machined Components
NPR-RIKEN draw on our many years of expertise in materials and surface treatment technologies to provide a wide range of precision-machined components that offer high performance, durability, and accuracy.
Turbo Charger Seal Rings
What kind of product is a turbocharger seal ring?
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 kind of product is a valve lifter?
Valve lifters achieve extremely low friction resistance by applying a DLC coating to the surface in contact with the cam. This ensures smoother operation within the engine, significantly contributing to improved responsiveness, better fuel economy, and a longer service life.
Properties of valve lifters
By applying texturing grooves to the surface of the DLC coating using an ultra-short-pulse laser, we have improved low-friction performance and durability in the boundary lubrication and mixed lubrication regions at low speeds. This technology enables the use of lower-viscosity engine oils, contributing to improved fuel efficiency.
Friction evaluation results
Friction reduced by approximately 13% compared to the DLC lifter
Friction-reducing effect of texturing
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 area improves from mixed lubrication to fluid lubrication as oil scraped from the textured grooves is automatically supplied to the flat areas.
Aluminum Vane
What kind of product is an aluminum vane?
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.
Properties of aluminum vanes
・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 was difficult to achieve with general-purpose aluminum alloys.
・Our original high-performance aluminum alloy is currently being used in automotive compressor vanes, and is expected to find applications in various mechanical components for automobiles and motorcycles.
Properties 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
Our original high-performance aluminum alloy uses powder as its starting material, which allows for greater design flexibility. Even when large amounts of silicon or transition metals are added, the microstructure remains fine, resulting in higher rigidity and high-temperature tensile strength compared to conventional aluminum alloys.
Excellent strength at high temperatures
High Young’s modulus
Low thermal expansion coefficient
A 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 set in the cylinder block, forms the inner part of the engine's combustion chamber.
The cylinder liner has a wet liner that directly contacts the outer surface of the cooling water and a dry liner that is inserted into the machined cylinder block.
We have long experience in thin-walled dry liner for commercial diesel engines.
Dimple Liner, which contributes to improving fuel efficiency, is our proprietary technology.
