A5073562668- Lubricants and Their Additives
- Metal and Thin Film Mechanics
- Force Microscopy Techniques and Applications
- Diamond and Carbon-based Materials Research
- Tribology and Wear Analysis
- Tribology and Lubrication Engineering
- Adhesion, Friction, and Surface Interactions
- Advanced Surface Polishing Techniques
- Gear and Bearing Dynamics Analysis
- Microstructure and Mechanical Properties of Steels
- Mechanical stress and fatigue analysis
- Mechanical Engineering and Vibrations Research
- Metal Alloys Wear and Properties
- Surface Roughness and Optical Measurements
- Metal Forming Simulation Techniques
- Electrical Contact Performance and Analysis
- Corrosion Behavior and Inhibition
- Molecular Junctions and Nanostructures
- Fuel Cells and Related Materials
- Mechanical and Optical Resonators
- Advanced machining processes and optimization
- Electron and X-Ray Spectroscopy Techniques
- Rheology and Fluid Dynamics Studies
- Fluid Dynamics and Mixing
- High-pressure geophysics and materials
Toyota Central Research and Development Laboratories (Japan)
2009-2024
Toyota Motor Corporation (Switzerland)
1993-2024
Nagoya Institute of Technology
2017
Tokyo Institute of Technology
2009
Coarse-grained Metropolis Monte Carlo Brownian Dynamics simulations are used to clarify the ultralow friction mechanism of a transfer film multilayered graphene sheets. Each circular sheet consists 400 1,000,000 atoms confined between upper and lower sliders allowed move in 3 translational 1 rotational directions due thermal motion at 300 K. The sheet–sheet interaction energy is calculated by sum pair potential sp2 carbons. sliding done moving slider constant velocity. In monolayer case,...
High-speed deep-groove ball bearings for the eAxle of electric vehicles must adapt to higher rotational speed conditions, because motor increases downsize unit. Therefore, it is necessary clarify lubrication process at high speeds prevent seizure and wear. The oil-film thickness between outer-ring ball, oil distribution around balls in 6008 incorporating experimental quartz outer rings were measured under high-speed with exceeding 20,000 min−1. These measurements carried out by employing...
Numerous researchers have focused on the relation between kinetic friction and surface properties of materials, such as their roughness chemical state, because is loss energy at a sliding interface. Contrary to conventional wisdom, recent theory has predicated that, given fact phonon dissipation, depends bulk atoms in solid, not only properties. However, this expectation been proven. Here we show evidence idea via atomic-scale experiments simulations. We compared frictions isotopically...
In this study, we developed and practiced colorimetric optical interferometry for the direct observation of contact states to clarify phenomena. We theoretically demonstrated that effect roughness diffuse reflection could be neglected using interferometric light intensity according relationship between film thickness hue. Then, measured static surfaces spherical test pieces different root mean square roughnesses. Results indicate nominal area is significantly larger than obtained from...
DLC films are of significant interest for automobile parts, because they possess the potential to improve friction property under oil lubricated conditions. In order obtain further low friction, we focused on combination boron doped (B-DLC) and Mo-trimer as a lubricating additive, influence concentration B-DLC was evaluated by block ring type test. Compared without boron, exhibited an extremely coefficient below 0.03 ranging from 2 12 at% in condition using engine containing Mo-trimer. It...
The dominant factors and processes for the rapid progression of scuffing from a partial area to an entire surface under lubricated, plane contact, pure sliding conditions were studied by performing in situ observation surface, measurements oil-film thickness temperature distributions during scuffing. Transitions measured using three-wavelength optical interferometry, thermography. It was observed that breakdown progressed within several tens milliseconds high speed high-load conditions....
Deep-groove ball bearings for the eAxles of electric vehicles must adapt to higher rotational speed conditions because eAxle motors have been increasing as size and weight decrease. Therefore, understanding oil-lubricated inside at high speeds is essential optimizing their design eAxles. To clarify these speeds, a new test apparatus was developed. This capable simultaneously measuring friction torque deep-groove bearings, oil-film thickness on rolling balls, observing oil distributions up...
A contact between surfaces with low roughness (approximately 0.01–0.1 μm) and relatively large nominal area (mm2 order) is a complex phenomenon that requires consideration of deformation behavior at various scales, an important subject in mechanics. Contact simulation using the elastoplastic boundary element method considered to be effective for this analysis. However, only few studies have examined such contacts detailed comparison measurement data, meaning accuracy has not been...
To investigate feature of phonon energy dissipation in friction process, we compared frictions isotopic diamonds atomic force microscope and scale simulations. The ^<13>C is lower than that ^<12>C by approximately 3%. This result suggests the diamond results from inhibition energy-dissipative a heavier atom mass.
Environment issues have restricted the industry-wide trend to reduce amount of Cl or P additive used for lubrication in metal forming.Diamond like carbon (DLC) has superior tribological properties such as low friction and wear resistance under poor lubrication.However, DLC never been applied severe forging forming.Thus, we focused on a Si-containing (DLC-Si) coating with high adhesion strength, which sliding parts.The combination DLC-Si polymer-containing oil without S additive, was...