A review of continuous contact-force models in multibody dynamics

The effect of both surfaces textured on improvement of tribological properties of sliding elements

Multi-objective optimization of hypoid gears to improve operating characteristics

An assessment of gas power leakage and frictional losses from the top compression ring of internal combustion engines

An improved technique for measuring piston-assembly friction and comparative analysis with numerical simulations: Under motored condition

Performance of Surface Texturing During Start-Up Under Starved and Mixed Lubrication

Transient tribo-dynamics analysis and friction loss evaluation of piston during cold- and warm-start of a SI engine

To reduce the fuel consumption of internal combustion engines, more attention has been paid to the tribological performance of the piston ring pack during the cold start and idle operations. In this research, a numerical model considering the cylinder liner deformation and the piston ring conformability is developed to predict the blow-by, lubrication, friction and wear of the piston ring pack under different operating conditions. The gas flow rate, inter-ring gas pressures, minimum oil film thickness, frictional force and wear load during cold start are calculated and compared with those during warm idle operating conditions. The results show that cylinder liner deformation and piston ring conformability together obviously affect blow-by and other tribological performance. Meanwhile, it is found that friction loss is larger during cold start than during warm idle operating conditions. However, the wear process is more severe during warm idle operation than during cold start. From this research, the blow-by and tribological performance of the piston ring pack during cold start and warm idle operations are understood more deeply.

Blow-by and tribological performance of piston ring pack during cold start and warm idle operations

Online measurement of piston-assembly friction with wireless IMEP method under fired conditions and comparison with numerical analysis

The invention discloses a friction pair automatic oil supply lubrication method for automatically supplying oil to improve the surface lubrication conditions of a friction pair and an implementation device thereof. The implementation device comprises a temperature sensor, a temperature acquiring module, a programmable logic controller, an electromagnetic valve, an oil pump, an overflow valve and a computer; the oil pump serves as a power source for continuously supplying pressure oil; and the programmable logic controller controls opening and closing of the electromagnetic valve to determine the oil pumping and the oil pumping time. A hydraulic technology, an automatic control technology and a microhole machining technology are integrated; based on a traditional friction pair surface lubrication method, a self-lubrication method for realizing automatic oil supply by using surface temperature change and an implementation device are proposed; such problems as low utilization rate of the lubricating oil and complex system in the traditional method are solved; the function of automatically supplying the oil to the surface of the friction pair is realized; the use efficiency of the lubricating oil is improved; and the lubrication conditions of the friction pair can be timely improved. The implementation device is reasonable in design, simple in structure and suitable for improving the lubrication conditions in an advancing mechanical system.

Friction pair automatic oil supply lubrication method and implementation device thereof

Xiaoli Kong

Papers

Performance of Surface Texturing During Start-Up Under Starved and Mixed Lubrication

Transient tribo-dynamics analysis and friction loss evaluation of piston during cold- and warm-start of a SI engine

Blow-by and tribological performance of piston ring pack during cold start and warm idle operations

Online measurement of piston-assembly friction with wireless IMEP method under fired conditions and comparison with numerical analysis

Friction pair automatic oil supply lubrication method and implementation device thereof