An Improved Quasi-Dynamic Analytical Method to Predict Skidding in Roller Bearings under Conditions of Extremely Light Loads and Whirling

Li, Junning; Wei, Chen; Zhang, Libo; Wang, Taofeng

doi:10.5545/sv-jme.2015.2848

Cited by 8 publications

(7 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar ranges of the above duty parameters were also reported in the past studies. 39,40 The distance of the steel ball to the disc center ( r ) is 18 mm. In the experiment, the ambient temperature and humidity are 25 ℃ and 50%, respectively.…”

Section: Methodsmentioning

confidence: 99%

Tribological performances of graphite–MoS₂ coating at various high temperatures

Han

Qian²,

Meng

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

The tribological performances of the graphite–MoS2 coating deposited on the disc specimen, whose material is GCr15 steel, are experimentally investigated under high temperatures. Effects of graphite content, applied load, rotational speed and test temperature on the coefficient of friction and wear scar width of the coating are evaluated. The graphite–MoS2 coating with 20 wt% graphite addition exhibits the relatively small coefficient of friction and wear scar width at 200 ℃. At or beyond 400 ℃, the coating's lubricating effect is severely deteriorated with the testing time. At 200 ℃, there exists a critical applied load of 10 N and a critical rotational speed of 1250 rpm beyond which the MoS2 coating with 20 wt% graphite content is worn through and brings out a large coefficient of friction. The test results indicate that adding 20 wt% to 33 wt% graphite to MoS2 coating leads to an obvious reduction of the coefficient of friction and wear scar width for the coating at 200 ℃.

show abstract

Section: Methodsmentioning

confidence: 99%

Tribological performances of graphite–MoS₂ coating at various high temperatures

Han

Qian²,

Meng

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

show abstract

“…When the radial load is too small, and the roller speed is high, the oil film bearing area does not form enough oil film traction force, thus causing strong skidding between the key contact pairs of the bearing. However, when the radial load is too large, the oil film in the bearing area will rupture, resulting in dry friction between the key contact pairs of the bearing, in turn causing skidding damage [25]. From Figure 8, we can analyze that with the increase in the radial load, when the load fluctuates widely in the test, the impact component induced by roller skidding becomes more obvious in the vibration response of the rolling bearing and the impact energy increases.…”

Section: Relationship Between Radial Load and Skidding Damagementioning

confidence: 99%

Effect of Multiple Factors on Identification and Diagnosis of Skidding Damage in Rolling Bearings under Time-Varying Slip Conditions

Chen

Xue

et al. 2019

Applied Sciences

Self Cite

View full text Add to dashboard Cite

Skidding damage mechanism of rolling bearings is not clear, due to the influence of various coupling factors. To solve this problem, it is important to identify and diagnose skidding damage and study the vibration characteristics in rolling bearings. Based on Fast Fourier Transform (FFT) and Discrete Wavelet Transform (DWT), vibration signals of rolling bearings are extracted and analyzed, and then the skidding damage of rolling bearings from multiple signals perspectives is identified. The relationship between the variation in the radial load, temperature, slip and the skidding damage of rolling bearings under time-varying slip conditions is analyzed comprehensively, and then the influence of different factors on bearing skidding damage is studied. The integrated analysis of the vibration, load, temperature, slip rate and other multivariate signals information shows the starting time of skidding damage. This research can be conducive to reduce vibration and prolong the life of rolling bearings.

show abstract

“…Ciulli et al [17] presented a model for predicting scuffing considering various lubrication states during the operation of the machine, and the effectiveness of the model is verified through experiments. Li et al [18] used the elastohydrodynamic lubrication (EHL) method to calculate oil film thickness and pressure distribution in predicting roller bearings' skidding for obtaining more accurate oil film resistance. Li et al [19] carried out a life test on the space harmonic reducer, finding that the flexspline and bearings would wear under the condition of separate grease lubrication, and analysed the effects of different factors such as load and temperature on lubrication.…”

Section: Concli and Gorlamentioning

confidence: 99%

Research on the Lubrication Characteristics of Harmonic Gear Transmission Meshing Areas

Fan

Wei

et al. 2020

SV-JME

View full text Add to dashboard Cite

To analyse the lubrication characteristics of harmonic gears and lay the foundation for the study of its gear tooth failure performance and dynamic characteristics, based on the tooth contact geometry of harmonic gear, the integrated curvature radius, tooth load, and entrainment velocity at the meshing point of the gear teeth in the harmonic gear transmission are analysed. A finite-length line contact elastohydrodynamic lubrication (EHL) model for harmonic gears is established. The numerical calculation method is used to solve the oil film thickness and pressure distribution in the lubricating area, and the effects of rotational speed and temperature on the contacting load ratio and film thickness ratio of the meshing area are studied, as well as the change of oil film stiffness under different working conditions. The results show that along the meshing direction, the pressure is small at the end and reaches a peak at the centre, and the film thickness is the largest in the entrance area and is evenly distributed in the centre contact area. As the speed increases, the gear tooth contact load ratio decreases, the oil film thickness ratio increases, the stiffness of the oil film decreases significantly, and the lubrication effect is improved; but the temperature has the opposite effect. Proper increase of rotation speed and decrease of oil temperature can effectively improve the lubrication characteristics of the system.

show abstract

An Improved Quasi-Dynamic Analytical Method to Predict Skidding in Roller Bearings under Conditions of Extremely Light Loads and Whirling

Cited by 8 publications

References 14 publications

Tribological performances of graphite–MoS₂ coating at various high temperatures

Tribological performances of graphite–MoS₂ coating at various high temperatures

Effect of Multiple Factors on Identification and Diagnosis of Skidding Damage in Rolling Bearings under Time-Varying Slip Conditions

Research on the Lubrication Characteristics of Harmonic Gear Transmission Meshing Areas

Contact Info

Product

Resources

About

An Improved Quasi-Dynamic Analytical Method to Predict Skidding in Roller Bearings under Conditions of Extremely Light Loads and Whirling

Cited by 8 publications

References 14 publications

Tribological performances of graphite–MoS2 coating at various high temperatures

Tribological performances of graphite–MoS2 coating at various high temperatures

Effect of Multiple Factors on Identification and Diagnosis of Skidding Damage in Rolling Bearings under Time-Varying Slip Conditions

Research on the Lubrication Characteristics of Harmonic Gear Transmission Meshing Areas

Contact Info

Product

Resources

About

Tribological performances of graphite–MoS₂ coating at various high temperatures

Tribological performances of graphite–MoS₂ coating at various high temperatures