A multiphase computational study of oil distribution inside roller bearings with under-race lubrication

Gao, Wenjing; Nélias, Daniel; Li, Kun; Liu, Zhenxia; Lyu, Yaguo

doi:10.1016/j.triboint.2019.105862

Cited by 34 publications

(18 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the study of under-race lubrication with single aperture in Ref. [10], the lubricant oil is mainly concentrated on the outer ring raceway. At the speed of 5000 r/min, the oil volume fraction inside the bearing is higher than other speeds.…”

Section: Resultsmentioning

confidence: 99%

“…For bearings with under-race lubrication, lubricant oil flows into the bearing cavity through the apertures of inner ring due to centrifugal force and high pressure. The apertures are perpendicular to the inner raceway surface and rotate along with the inner rings [10]. Based on references [14] and [2], a 3D numerical model of the ball bearing with under-race lubrication is established.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Both end faces of the fluid inside the bearing are specified as pressure-outlet. The bearing cavity is supposed to be directly open to ambient air [10], and the pressure of both pressure-outlets is standard atmospheric pressure. Sliding mesh is used to reflect the rotational motion of the fluid domain.…”

Section: Meshing and Boundary Conditionsmentioning

confidence: 99%

“…When the diameter of aperture is 1.5 mm, there is only a small amount of lubricating oil inside the bearing, which is not conducive to lubrication and heat dissipation. As for the 2.5 mm diameter of aperture, the fluid-structure impact increases with the increase in diameter of aperture [10], which causes more lubricating oil to flow out of the bearing, and decreases the oil volume fraction. Combined with the analysis of the oil inlet velocity, the combination of oil inlet velocity and the aperture diameter needs to be optimized to obtain the best lubrication and cooling performance for the bearing.…”

Section: Diameter Of Aperturesmentioning

confidence: 99%

“…Adeniyi et al investigated oil droplet motion inside the bearing [2], and oil-air flow between the cage and inner ring of an aero-engine bearing [9], by the CLSVOF method. Gao et al [10] investigated oil distribution inside a roller bearing with under-race lubrication and discussed the effects of rotational speeds, oil inlet velocity and viscosity by a numerical method. Furthermore, NASA carried out some experimental studies on contact angular ball bearings.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Analysis of Oil-Air Two-Phase Flow Characteristics inside a Ball Bearing with Under-Race Lubrication

Bao

Hou

2020

Processes

View full text Add to dashboard Cite

Under-race lubrication can increase the amount of lubricating oil entering a bearing and greatly improve lubrication and cooling effects. The oil-air two-phase flow characteristics inside a ball bearing with under-race lubrication play a key role in lubrication and cooling performance. The motions of ball bearing subassemblies are complicated. Ball spin affects the oil volume fraction. In this paper, the coupled level set volume of fluid (CLSVOF) method is used to track the oil-air two-phase flow inside the ball bearing with under-race lubrication. The influence of various factors on the oil volume fraction inside the ball bearing with under-race lubrication is investigated, particularly rotating speeds, inlet velocity and the size of oil supply apertures under the inner ring. The influence of the ball spinning is analyzed separately. The result demonstrates that, on account of the centrifugal force, lubricating oil is located more on the outer ring raceway at rotational speeds of 5000 r/min, 10,000 r/min, 15,000 r/min and 20,000 r/min. The oil volume fraction inside the bearing gradually increases at an oil inlet velocity of 5 m/s, 10 m/s and 15 m/s. The circumferential distribution of oil is also similar. As the diameter of the oil supply aperture increases from 1.5 mm to 2 mm, the oil volume fraction increases inside the ball bearing. However, the oil volume fraction slightly decreases from 2 mm to 2.5 mm of oil supply aperture diameter. Ball spin does not affect the circumferential distribution trend of the lubricating oil, but slightly reduces the oil volume fraction. Furthermore, ball spin causes the surface fluid to rotate around its rotation axis and increases the speed.

show abstract

Section: Resultsmentioning

confidence: 99%