Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 888-896.doi: 10.13229/j.cnki.jdxbgxb20180069

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Numerical model of mixed lubrication for microgroove bearing considering axial reciprocating motion

Jia⁃xu WANG1,2(),Xiao⁃kang NI1,2,Yan⁃feng HAN1,2(),Guo XIANG1,2,Ke XIAO1,2   

  1. 1. State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
    2. College of Mechanical Engineering, Chongqing University, Chongqing 400044, China
  • Received:2018-01-18 Online:2019-05-01 Published:2019-07-12
  • Contact: Yan?feng HAN E-mail:138863973@qq.com;0220@163.com

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Abstract:

A numerical model was developed to investigate the mixed lubrication performance of herringbone grooved journal bearing when axial reciprocating motion and journal misalignment were considered. The oil film pressure considering the roughness effect can be obtained by transient average Reynolds equation. The elastic deformation can be obtained through influence function method, and the contact pressure can be simulated by Lee?Ren asperity contact model. The variation of oil?film force, contact load ratio, and friction coefficient with time were investigated by numerical simulation, and the effect of axial movement amplitude and misalignment angle on mixed lubrication performance were also studied. The research suggests that the oil?film force is corresponding over axial velocity, and the contact pressure shows inverse variation with axial velocity. Besides, the increase of axial movement amplitude in negative movement state will result in a significant reduction in load capacity and lubrication performance of journal bearing. The research also shows that the load capacity and lubrication performance of journal bearing decrease with the increase in misalignment angle.

Key words: mechanical design, microgroove bearings, mixed lubrication, reciprocating movement

CLC Number: 

  • TH133

Fig.1

Computational coordinate system of governing equation"

Fig.2

Reciprocating motion law of journal"

Fig.3

Schematic diagram of motion direction of journal"

Fig.4

Geometric model of misalignment journal"

Fig.5

Schematic diagram of inner surface groovestructure of journal bearing"

Fig.6

Flow chart of numerical calculation of mixed lubrication under axial and reciprocating motion"

Table 1

Calculation parameters of mixed"

参 数 数值 参 数 数值
轴承内径R B/mm 12.192 轴承转速ω/(r·min?1) 1500
轴承外径R O/mm 14.224 润滑油黏度η/(Pa·s) 0.0559
轴承长度L/mm 8.218 润滑油密度ρ/(kg·m?3) 860
半径间隙c/mm 0.088 轴瓦弹性模量E B/GPa 73
沟槽个数N g 8 轴瓦泊松比υ 0.3
沟槽宽度W g/mm 2 轴向网格数n 41
沟槽深度D g/μm 10 周向网格数m 240
沟槽夹角β/(o) 60 轴表面粗糙度σ 1/μm 0.2
端面偏心率ε 1.005 轴瓦表面粗糙度σ 2/μm 0.5
纹理参数γ 3 轴承表面硬度H/GPa 1.05
运动半程ΔL/mm 5 轴承偏斜角ψ/(o) 0.015
轴承偏斜方向角α/(o) 0

Fig.7

Validation of the model"

Fig.8

Distribution of lubrication characteristicsat maximum speed"

Fig.9

Rule of mixed lubrication performanceparameter with time"

Fig.10

Rule of mixed lubrication performanceparameter with time under different ΔL "

Fig.11

Rule of mixed lubrication performance parameter with time at different misalignment angles"

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