Heat Generation of Bearing

2011 ◽  
Vol 480-481 ◽  
pp. 962-967 ◽  
Author(s):  
Yan Shuang Wang ◽  
Zhe Liu ◽  
Hai Feng Zhu
Keyword(s):  
Heat Generation ◽  
Power Loss ◽  
Integral Method ◽  
High Speed ◽  
Ball Bearing ◽  
High Reliability ◽  
Roller Bearing ◽  
Rolling Bearing ◽  
Heat Sources ◽  
Local Method

Heat generation of a bearing was studied based in this paper. Computational models of power loss were built. The total heat generation was gotten. Influences on total heating were analyzed at various inner ring rolling velocities and applied loads. The results show that bearing rolling velocity and axial load affect heat generation strongly. Meanwhile sliding friction, which exists between balls and the cage pocket, cages and the surface of outer ring, is the main factors of bearing heating. Bearings with shaft are mainly used in gyro motors of aviation, aerospace, marine navigational systems, which own a long life and high reliability. Heat generated by friction affects its performance, life and reliability, and consequently influences control precision and life of gyro motors. If the rate of heat dissipation is less than the rate of the heat generation, the system temperatures will raise, the hardness of bearing ring and rolling element steel decrease, and resulting in plastic deformations, lubricant deterioration occurs, ultimately, heat imbalance failure leads to breakage of bearing components and bearing seizure[1,2].So precise evaluating heat generation of bearings with shaft is important for design, manufacture and application of bearing. The heat generation of bearing comes from power loss of friction. The traditional methods contain the local method and integral method [3]. Palmgren who used the integral method based on experimental results advanced an empirical formula of total friction moment [4]. The calculation result is lower than the fact because ignoring infection of lubricant flux. Astringe and Smith improved the above formula .But it was just for roller bearing. Harris established a local method for the ball bearing and rolling bearing [5]. Pouly et al [6, 7] analyzed part power loss of the high speed rolling bearing based on local method. Compared with the integral method, the local method calculated heating of all heat sources. The results were more accurate. Liu Zhi-quan, Han Min-zheng et al computed the heat of high speed rolling and ball bearing by the local method [8, 9]. This paper studies heat generation mechanism of bearing with shaft from a gyro motor. Different heat sources from bearings are calculated by a self-made program. All factors which influence heat generation would be gotten by analyzing at different working conditions. It would offer a theoretical basis for optimal design and proper use of bearings with shaft.

Operating temperature in high-speed ball bearing

2007 ◽  
Vol 221 (3) ◽  
pp. 353-359 ◽  
Author(s):  
L Q Wang ◽  
G C Chen ◽  
L Gu ◽  
D Z Zheng
Keyword(s):  
Heat Generation ◽  
High Speed ◽  
Ball Bearing ◽  
Operating Temperature ◽  
Frictional Heating ◽  
Transient Temperature ◽  
Heat Sources ◽  
Main Shaft ◽  
Aero Engines ◽  
Set Up

Frictional heating in high-speed bearings has been one of the primary factors for the failure of the main shaft bearing in aero engines. In order to exactly evaluate the heat generation and temperature in the bearing, a process has been developed, based on power consumption, which allows evaluation of heat generation in the high-speed ball bearing. A model for computing the temperature of the high-speed ball bearing with axisymmetric load is set up. In this model, heat sources in the raceways are treated as moving and the heat generation in the ball and cage is averaged on the circumferential zone through which the heat source passes. Using the process and model presented here, heat generation and the transient temperature of a ball bearing are obtained.

Lubrication and Thermal Failure Mechanism Analysis in High-Speed Angular Contact Ball Bearing

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Wang Yunlong ◽  
Wang Wenzhong ◽  
Li Yulong ◽  
Zhao Ziqiang
Keyword(s):  
Rotational Speed ◽  
High Speed ◽  
Ball Bearing ◽  
Rolling Bearing ◽  
Operating Conditions ◽  
Contact Forces ◽  
Mechanism Analysis ◽  
Angular Contact Ball Bearing ◽  
Thermal Failure ◽  
Lubrication Performance

Lubrication analysis of rolling bearing is often conducted with assumed operating conditions, which does not consider the effect of internal dynamics of rolling bearing. In this paper, the effects of the applied load and bearing rotational speed on the lubrication performance in an angular contact ball bearing are conducted, which combines the bearing dynamic analysis and thermo-elastohydrodynamic lubrication (TEHL) analysis. First, the internal motions and contact forces are obtained from the developed bearing dynamic model, and then were integrated into the TEHL model to investigate the lubrication performance of the bearing. The results show that the rotational speed and external load has significant effects on film thickness, temperature, and power loss; if the improper axial load is applied for certain bearing speed, the lubrication performance will deteriorate and thermal failure may occur; there exists critical load or speed to keep good lubrication performance and avoid thermal failure; the skidding contributes to the thermal failure and bad lubrication performance.

scholarly journals Study on the Thermal Distribution Characteristics of High-Speed and Light-Load Rolling Bearing Considering Skidding

2018 ◽  
Vol 8 (9) ◽  
pp. 1593 ◽  
Author(s):  
Junning Li ◽  
Jiafan Xue ◽  
Zhitao Ma
Keyword(s):  
Temperature Distribution ◽  
Power Loss ◽  
High Speed ◽  
Roller Bearing ◽  
Transient Temperature ◽  
Rolling Bearings ◽  
Slip Ratio ◽  
Friction Power ◽  
Thermal Distribution ◽  
Light Load

Skidding, which frequently occurs in high-speed rolling bearings, has a significant effect on the thermal distribution and service reliability of the bearings. An improved theoretical model of friction power loss distribution in high-speed and light-load rolling bearings (HSLLRBs) considering skidding is established, and the effects of various operating parameters on the friction power loss are investigated. The results show that the friction power loss of the inner ring and outer ring as well as the total friction power loss of the bearing increase as the slip ratio increases, but that the friction power loss of the cage guide surface and roller oil churning show a reverse trend. In addition, the increase in inner ring speed and kinematic viscosity leads to an increase in bearing friction power loss. The steady and transient temperature field distribution of HSLLRBs is obtained by the finite element method (FEM), and the results show that the inner ring raceway has the highest temperature, whereas the cage has the lowest. The temperature distribution test rig of a full-size roller bearing is constructed, and the influence mechanism of the slip ratio, rotation speed, load, lubrication, and surface topography on the bearing temperature distribution are obtained. The experimental results are consistent with the theoretical results, which also validates the theoretical method.

Influence of Pocket Wear on the Dynamic Characteristics of High-Speed Ball Bearing Cage

2019 ◽  
Author(s):  
Hui Li ◽  
Chen Li ◽  
Yuan Li ◽  
Shemiao Qi ◽  
Yi Liu ◽  
...  
Keyword(s):  
Dynamic Model ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Ball Bearing ◽  
Rolling Bearing ◽  
Outer Ring ◽  
Wear Loss ◽  
Vibration Modes ◽  
Mass Center ◽  
Fluctuation Amplitude

Abstract Aiming at the problem of wear on the cage-pocket during the operation of high speed rolling bearing, a dynamic model of high-speed ball bearing was established considering the wear loss of the ball-pocket, and the simulation was carried out to research on the interaction among the balls, the inner ring, the outer ring and the cage with different wear loss of the ball-pocket. The effect of the pocket wear on the trajectory of the cage’s mass center and the skidding ratio of cage was obtained. It was found out that the mass-center trajectory of the cage presents two vibration modes with different amplitudes which emerges alternatively. Moreover, the wear loss of the ball-pocket has little effect on the average skidding ratio of the cage, however, the fluctuation amplitude would become larger as the wear increase. This study can provide theoretical guidance for the design of bearing cage pocket size.

Effect of vibration on power loss of angular contact ball bearings

2019 ◽  
Vol 72 (5) ◽  
pp. 657-664
Author(s):  
De-Xing Zheng ◽  
W.F. Chen ◽  
Guanyun Xiao ◽  
Dateng Zheng
Keyword(s):  
Heat Generation ◽  
Power Loss ◽  
High Speed ◽  
Forecasting Model ◽  
Ball Bearings ◽  
Content Type ◽  
Additional Load ◽  
Vibration Effect ◽  
Bearing Loads ◽  
Experimental Values

Purpose This paper aims to devote to the experimental analysis and modeling on the heat generation of angular contact ball bearings under vibration. Design/methodology/approach The experiments about vibration effect on bearing temperature are implemented. To explore the causes of bearing temperature rise, the shaft-bearing system is first simplified to a forced vibration model to analyze the bearing loads in vibration. Next, the vibratory-induced additional load is proposed and the spin power loss of balls is re-derived under vibration. The vibration-induced heat is integrated into a novel forecasting model of bearing power loss. For validation, the muti-node model for angular contact ball bearings is referred to create the thermal network of spindle front bearing, and then the contrast and discussion is done. Findings The simulation and test results both indicate that more energy is expended and more heat is generated with vibration. And the further quantitative comparisons between simulation results and experimental values of bearing temperature demonstrate the rationality and availability of constructed model on bearing heat generation. Originality/value The vibration-induced additional load is proposed and modeled, and the novel forecasting model for heat generation for high-speed angular contact ball bearings with vibration is constructed and validated.

Statistical Distribution of Tapered Roller Bearing Fatigue Lives at High Levels of Reliability

2005 ◽  
Vol 127 (4) ◽  
pp. 865-870 ◽  
Author(s):  
Michael N. Kotzalas
Keyword(s):  
Weibull Distribution ◽  
High Reliability ◽  
Roller Bearing ◽  
Rolling Bearing ◽  
Current Data ◽  
Statistical Distribution ◽  
Data Set ◽  
Roller Bearings ◽  
Tapered Roller ◽  
Two Parameter

The original two-parameter Weibull distribution used for rolling element fatigue tends to under-estimate life at high levels of reliability. This is due to the fact that a finite life value for which 100% of the population will survive cannot be considered with this method. However, empirical evidence of a minimum life at 100% reliability has been shown for through hardened ball and spherical roller bearings, linear ball bearings, and tapered roller bearings (TRB), however, for TRB’s there is no mention as to the heat treatment nor is there a method put forth to approximate the data. Therefore, an experimental data set of 9702 TRB’s, 98% case carburized (CC), and another data set of 280 through hardened (TH) TRB’s were collected and utilized to provide evidence of a finite life at 100% reliability. The current data for both heat treatments appeared to follow that previously published for TRB’s, however, varied from published work on other bearing types. Next, a three-parameter Weibull distribution was fit to the CC data and found to be equally applicable to the TH data set. Use of this three-parameter Weibull distribution reduced the overall root-mean square (RMS) error over both data sets by at least half, and at very high reliability levels by at least one-third compared to the two-parameter Weibull, both conservatively underestimating. However, as there is still some error in the three-parameter Weibull fit and differences in the results based upon bearing type and date of study, more investigation should be conducted in this area to identify the proper variables and the true statistical distribution for all rolling bearing constructions.

scholarly journals Performance of Computer-Optimized Tapered-Roller Bearings to 2.4 Million DN

1981 ◽  
Vol 103 (1) ◽  
pp. 13-20 ◽  
Author(s):  
R. J. Parker ◽  
S. I. Pinel ◽  
H. R. Signer
Keyword(s):  
Heat Generation ◽  
High Speed ◽  
Roller Bearing ◽  
Inlet Temperature ◽  
Tapered Roller Bearing ◽  
Roller Bearings ◽  
Operation Temperature ◽  
Tapered Roller ◽  
High Speed Design ◽  
Tapered Roller Bearings

The performance of 120.65-mm (4.75-in.) bore high-speed design tapered roller bearings was investigated at shaft speeds of 20,000 rpm (2.4 million DN) under combined thrust and radial load. The test bearings design was computer optimized for high-speed operation. Temperature distribution and bearing heat generation were determined as a function of shaft speed, radial and thrust loads, lubricant flow rates, and lubricant inlet temperature. The high-speed design tapered roller bearing operated successfully at shaft speeds up to 20,000 rpm under heavy thrust and radial loads. Bearing temperatures and heat generation with the high-speed design bearing were significantly less than those of a modified standard bearing tested previously. Cup cooling was effective in decreasing the high cup temperatures to levels equal to the cone temperature.

scholarly journals Research on the influencing factors of thermal characteristics of high-speed grease lubricated angular contact ball bearing

2021 ◽  
Vol 13 (6) ◽  
pp. 168781402110273
Author(s):  
Chang Zhang ◽  
Dan Guo ◽  
Jiyin Tian ◽  
Qingbo Niu
Keyword(s):  
Thermal Expansion ◽  
Heat Generation ◽  
High Speed ◽  
Ball Bearing ◽  
Thermal Characteristics ◽  
Generation Model ◽  
Analysis Model ◽  
Angular Contact Ball Bearing ◽  
Bearing Contact ◽  
Contact Parameters

The high temperature rise of grease lubricated angular contact ball bearing under high speed operation will affect the working accuracy of the bearing, and even lead to the loss of accuracy. In this paper, a friction heat generation model for high-speed grease lubricated angular contact ball bearing was established. Based on the quasi-static analysis model, the thermal expansion of the bearing components is brought into the quasi-static equilibrium equation, and the modified quasi-static analysis model of high-speed grease lubricated ACBB is obtained. Under grease lubrication conditions, a local bearing heat-generation model was employed to assess power losses in different contact zones, in which bearing contact parameters, external loads, and rotation speeds conditions were fully considered. Moreover, the temperature distribution of grease lubricated high-speed bearing was analyzed by the multi node thermal network method. Through the analysis model of bearing dynamic and thermal characteristics considering the influence of thermal expansion established, bearing contact parameters have significant differences. The calculated values of outer ring temperature of grease lubricated angular contact ball bearing is in good agreement with the experimental values. The model can predict the temperature values of grease lubricated angular contact ball bearing under axial load at high speed.

scholarly journals Modeling of Heat Phenomenon in Rolling Kinematic Pairs Using the Finite Element Method

2021 ◽  
Vol 11 (14) ◽  
pp. 6447
Author(s):  
Jan Kosmol
Keyword(s):  
High Speed ◽  
Fem Simulation ◽  
Rolling Bearing ◽  
Heat Sources ◽  
Geometric Form ◽  
Simulation Studies ◽  
The Finite Element Method ◽  
Rolling Bearings ◽  
Fem Simulations ◽  
High Speed Cutting

In the spindles of HSC (High Speed Cutting) machines with rolling bearings, higher temperatures in the bearings can be expected, which may affect the resistance to movement of the bearing itself. Therefore, to estimate these resistances, it is necessary to know the temperatures of the bearing components. The article presents the results of FEM simulation tests of temperature distribution in a rolling bearing. These studies were focused on assessing the influence of such features as the distribution of heat sources, the geometric form and size of the contact areas of the balls with the raceways, the conditions of heat convection to the environment and heat conduction inside the bearing. It has been recognized that FEM simulations for the default conditions offered by most commercial FEM systems can lead to out-of-the-box results. As part of the experimental research, conclusions from the simulation studies were verified.

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