Analysis of Fatigue Life of Slewing Bearings Considering Size Effect

doi:10.12068/j.issn.1005-3026.2024.12.010

Abstract

Abstract:

Aiming at the problem of size effect in the process of fatigue life analysis of slewing bearings， the fatigue life analysis of slewing bearings is carried out and the influencing law of size effect is studied in depth. By establishing the contact load calculation model and determining the contact force distribution， combined with the Lundberg-Palmgren theory， the fatigue life of slewing bearings with different sizes is calculated. The coupling relationship between ball number and diameter， the influence of raceway center circle diameter and other parameters on the fatigue life of slewing bearings are analyzed， and the size effect of slewing bearings on the fatigue life is discussed， which provides reference for the design and selection of slewing bearings. The results show that reducing the groove curvature coefficient， increasing the contact angle and the raceway center circle diameter can increase the service life of slewing bearings. The influence of ball diameter change on the service life of slewing bearings is greater than that of the change of the raceway center circle diameter， and the increase of contact angle will enhance the size effect， while the increase of groove curvature coefficient will weaken the effect.

Key words: slewing bearing, size effect, fatigue life, contact load, modelling

CLC Number:

TP 20

Zhong LUO, Yao-jia YANG, Si-jia ZHENG, Ji-lai ZHOU. Analysis of Fatigue Life of Slewing Bearings Considering Size Effect[J]. Journal of Northeastern University(Natural Science), 2024, 45(12): 1751-1758.

Figures/Tables 17

Fig.1 Structure of the single‑row four‑point contact slewing bearing

Table 1 Parameters of 010.40.1000 slewing bearings mm

参数	数值	参数	数值
公称直径D₁	1 122	总高H	100
公称内径d	878	内外圈高度H₁	90
内圈外径D₂	1 001	滚道中心圆直径d_m	1 000
外圈内径d₁	998	滚珠直径D	40

Table 2 Parameters of slewing bearings with

序号	基本型号	滚珠直径	滚道中心圆直径	公称外径	公称内径
1	010.40.1000	40	1 000	1 122	878
2	010.30.1000	30	1 000	1 122	878
3	010.30.500	30	500	602	398
4	010.20.250	20	250	330	170
5	010.20.200	20	200	280	120

Fig.2 Diagram of slewing bearing geometry in the initial state

Fig.3 Diagram of load on the slewing bearing

Fig.4 Contact force distribution diagram of slewing bearing

Table 3 Data in reference[12]

参数	理论计算值	实验值	FE-SAFE仿真值
圈数	8 821 000	8 386 560	7 533 600
误差	5.18%	0%	10.17%

Fig.5 Effect of ball diameter on the fatigue life of slewing bearings of different sizes

Table 4 Diameter and ball number of bearing 1

组数	1	2	3	4	5	6
滚珠直径/mm	38	40	42	44	46	48
滚珠个数	77	74	70	67	64	62

Table 5 Diameter and ball number of bearing 2

组数	1	2	3	4	5	6
滚珠直径/mm	29	30	31	32	33	34
滚珠个数	100	97	94	91	89	86

Table 6 Diameter and ball number of bearing 3

组数	1	2	3	4	5	6
滚珠直径/mm	29	30	31	32	33	34
滚珠个数	50	48	47	45	44	43

Table 7 Diameter and ball number of bearing 4

组数	1	2	3	4	5	6
滚珠直径/mm	19	20	21	22	23	24
滚珠个数	37	35	33	32	31	30

Fig.6 Effect of coupling the diameter and number of balls on the fatigue life

Fig.7 Effect of initial contact angle on the fatigue life of slewing bearings

Fig.8 Effect of contact angle change on the fatigue life of slewing bearings with different sizes

Fig.9 Effect of groove curvature coefficient on the fatigue life of slewing bearings

Fig.10 Effect of groove curvature coefficient on the fatigue life of slewing bearings with different sizes

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