simulating fullerene ball bearings of ultra-low friction

bearing failure costly maintenance and expensive downtime QIBR Explorer performance class bearings are a clear choice In light-to-normal load applications where these factors are typically not an issue the answer is the QIBR Energy Efficient performance class In these applications ultra low friction E2 bearings will reduce total cost Simulating fullerene ball bearings of ultra-low friction Xiaoyan Li and Wei Yang-Recent citations Ultra-low friction of graphene/C60/graphene coatings for realistic rough surfaces Haoxuan Li and Paulo S Branicio-Superlow friction and diffusion behaviors of a steel-related system in the presence of nano lubricant additive in PFPE oil Qunfeng Zeng-

Evaluation of Ultra

When a traversing process is continuously repeated the friction torque of the bearing traces out hysteresis loops This phenomenon is often described as ball jitter An apparatus was built to study the ultra-low-speed hysteresis behavior found in jittering ball bearings This behavior was first modeled by P R Dahl (1968)

The friction behavior of Si 3 N 4 ceramic balls operating under ultra-low-speeds with velocity reversal is investigated Twenty-one sets of exclusively ultra-low-speed operating conditions were examined that include rotational speeds in the range of 01–1 deg/s normal loads varying from 81 6 to 185 4 N per ball and two conventional lubricants: DTE 24 and SAE 20 oil

The MD simulation model is composed of two paralleled graphene sheets and the confined fullerene-water NFs schematically shown in Fig 1(a) Initially 2550 water molecules and 10 fullerene molecules are confined in the parallel graphene sheets with the size in lateral x and y directions of 5 3 nm 2

Friction characteristics and wear behaviors at contact interfaces are examined by the block-on-ring tests high-resolution transmission electron microscopy (HRTEM) and mapping (MAP) analysis The results suggest that the addition of CNCs to the mineral oil yields an effective reduction in the friction coefficient at the contact interface

Single row low-friction torque ball bearing for differential pinions Structure of ultra-low torque tapered roller bearing (LFT-IV) to control oil in˜ow Resin cage Groove inside pocket Improved anti-seizure Proving Ground Enables Testing / Evaluations Simulating Roads Worldwide OFFICES JTEKT CORPORATION NAGOYA HEAD OFFICE No 7-1 Meieki 4

Static and vibrational analysis of fullerene using a newly

Oct 01 2012Ultra-low friction fullerene ball bearing is simulated by Li and Yang They implemented direct molecular dynamic simulations for molecular ball bearings composed of fullerene molecules and multi-walled carbon nanotubes and indicated that fullerene ball bearings have extremely low friction and energy dissipation

Oct 11 2006where Z is the distance between the centres of the fullerene C 60 and the carbon nanotube m f the total mass of the fullerene C 60 F vdW (Z) the van der Waals restoring force and F r (Z) the total sliding resistance force experienced by the C 60 molecule Since experiments have shown for multi-walled carbon nanotube oscillators that F r (Z) is extremely small when compared with the

When a traversing process is continuously repeated the friction torque of the bearing traces out hysteresis loops This phenomenon is often described as ball jitter An apparatus was built to study the ultra-low-speed hysteresis behavior found in jittering ball bearings This behavior was first modeled by P R Dahl (1968)

Angular contact ball bearings Single row angular contact ball bearings Double row angular contact ball bearings Four-point contact ball bearings Self-aligning ball bearings Thrust ball bearings Angular contact thrust ball bearings Thin section bearings Roller bearings Cylindrical roller bearings Single row cylindrical roller

Provided are drill stem assemblies with ultra-low friction coatings for subterraneous drilling operations In one form the coated drill stem assemblies for subterraneous rotary drilling operations include a body assembly with an exposed outer surface including a drill string coupled to a bottom hole assembly or a coiled tubing coupled to a bottom hole assembly and an ultra-low friction

Apr 09 2010Searching for ultra low friction bearing with 5/16 bore Searching for ultra low friction bearing with 5/16 bore hydrobro (Civil/Environmental) (OP) 5 Apr 10 10:34 Does anyone know where I can find a relatively inexpensive ulta-low friction ball bearing with 5/16 bore My application demands really low friction under 10 rpm room temperature

The present paper describes rotations of C60 fullerene molecules in the solid phase of a fullerite The conducted studies show that these relatively large molecules rotate according to the same laws as macroscopic bodies i e according to the laws of classical mechanics The performed calculations confirm that fullerene rotations do not cause friction

The friction behavior of Si 3 N 4 ceramic balls operating under ultra-low-speeds with velocity reversal is investigated Twenty-one sets of exclusively ultra-low-speed operating conditions were examined that include rotational speeds in the range of 01–1 deg/s normal loads varying from 81 6 to 185 4 N per ball and two conventional lubricants: DTE 24 and SAE 20 oil

Molecular dynamics simulation of effects of

The temperature of a friction pair exerts considerable influence on the tribological behavior of a system In two cases one with and the other without Cu (copper) nanoparticles the temperature increase in friction pairs caused by frictional heating and its tribological properties at various temperatures are studied by using the molecular dynamics approach The results show that temperature

Sep 11 2020The movement pattern of ellipsoidal nanoparticles confined between copper surfaces was examined using a theoretical model and molecular dynamics simulation Initially we developed a theoretical model of movement patterns for hard ellipsoidal nanoparticles Subsequently the simulation indicated that there are critical values for increasing the axial ratio driving velocity of the contact

In some applications especially for the attitude control of navigation system the friction moment of instrument ball bearings is one of the much more important factors Its magnitude and fluctuation affect not only the energy transfer but also the accuracy of signal transfer even though the bearings work at very low speed Experimental analysis showed that the cage rotated with a minor

Impact and friction model of nanofluid for molecular dynamics simulation was built which consists of two Cu plates and Cu-Ar nanofluid The Cu-Ar nanofluid model consisted of eight spherical copper nanoparticles with each particle diameter of 4 nm and argon atoms as base liquid The Lennard-Jones potential function was adopted to deal with the interactions between atoms

Oct 01 2012Ultra-low friction fullerene ball bearing is simulated by Li and Yang They implemented direct molecular dynamic simulations for molecular ball bearings composed of fullerene molecules and multi-walled carbon nanotubes and indicated that fullerene ball bearings have extremely low friction and energy dissipation

friction and wear behavior [3] Currently the addition of friction modifier additives (i e organic friction modifiers and nanoparticles) to tribology and lubrication systems is considered as a useful method for friction and wear reduction [2–5] Given their thermal stability at high temperatures nanoparticles

Mar 30 2020The friction behaviors against Si 3 N 4 are worse than those against Al 2 O 3 More interestingly the self-mated FL-C:H films exhibit better friction behaviors than those against Al 2 O 3 Thus the Al 2 O 3 counterbody or self-mated method is beneficial to achieve ultra-low or super-low friction in open air The differences are also supported

Nov 01 2019The tribological properties of the graphene/C 60 /graphene sandwich structure are investigated by molecular dynamics simulations Friction coefficients are calculated for the sandwich structure composed of graphene layers and a single C 60 film layer i e a {111} monolayer of a C 60 face centered cubic crystal The effect of surface roughness on the tribological properties is considered

Volume production of tapered roller bearings of this so called ultra low friction design recently began for axle drives With its innovative angular roller unit (ARU) Schaeffler has developed a locating bearing that has a 40 % higher load rating at low friction than a deep groove ball bearing