scholarly journals Study on Radial Stiffness of Contact Pair of Logarithmic Modified Tapered Roller Bearing

2020 ◽  
Author(s):  
Shimin Luo ◽  
Junyi Wang
Keyword(s):  
Contact Stiffness ◽  
Roller Bearing ◽  
Great Influence ◽  
Contact Pair ◽  
Radial Load ◽  
Tapered Roller Bearing ◽  
Oil Film ◽  
Radial Stiffness ◽  
Calculation Results ◽  
Tapered Roller

Based on Hertz elastic contact theory, elastohydrodynamic lubrication theory, the equivalent radial stiffness model of roller raceway contact pair of logarithmic modified tapered roller bearing is derived under the consideration of oil film stiffness. The calculation results show that the equivalent radial contact stiffness increases with the increase of contact load, increases linearly with the increase of effective contact length of roller, and changes little with the increase of modification f1. When the radial load is small, the oil film has a great influence on the equivalent radial stiffness, which decreases gradually with the increase of the radial load.

Optimal Design of Parameters for Four Column Tapered Roller Bearing

2011 ◽  
Vol 63-64 ◽  
pp. 201-204 ◽  
Author(s):  
Zhi Wei Wang ◽  
Ling Qin Meng ◽  
Wen Si Hao ◽  
E Zhang
Keyword(s):  
Axial Load ◽  
Optimization Design ◽  
Roller Bearing ◽  
Working Life ◽  
Practical Method ◽  
Radial Load ◽  
Steel Rolling ◽  
Tapered Roller Bearing ◽  
Traditional Design ◽  
Tapered Roller

Tapered Roller Bearing can take huge radial load or two way axial load. It is widely used in over loading, steel rolling, metallurgy, etc. In this paper, according to the structural properties of Tapered Roller Bearing, we established an mathematical model to optimize the design of Tapered Roller Bearing. Based on the comparison of the result from our design and the traditional design of the Four Column Tapered Roller Bearing 3811/750/HC, the dynamic load increases 22% and the working life expectancy increases 85% by using our design. This fully shows the economical meaning of the optimization design, and it provides a practical method for the optimization design in future.

An Analytical Dynamic Model of a Hollow Cylindrical Roller Bearing

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Jing Liu ◽  
Yimin Shao
Keyword(s):  
Fatigue Life ◽  
Dynamic Model ◽  
Contact Stiffness ◽  
Roller Bearing ◽  
Great Influence ◽  
Radial Load ◽  
Shaft Speed ◽  
Roller Bearings ◽  
Cylindrical Roller ◽  
Analytical Dynamic

Hollow cylindrical roller bearings (HCRBs) have obtained much attention from design engineers in bearing industries since they can perform better than solid cylindrical roller bearings (SCRBs) in centrifugal forces, contact stiffness, cooling ability, fatigue life, etc. In this study, an analytical dynamic model of a lubricated HCRB is presented to analyze the influences of the radial load, the shaft speed, and the hollowness percentage of the roller on the bearing vibrations, which cannot be formulated by the methods in the reported literature. Both the support stiffness of the shaft and the roller mass are formulated in the presented dynamic model. The hollow hole in the roller is modeled as a uniform one. Numerical results show that the hollowness percentage of the roller has a great influence on the vibrations of the roller and the inner race of the HCRB. Moreover, the vibrations of the components of the HCRB are not only determined by the hollowness percentage of the roller, but also depended on the external radial load and shaft speed. Therefore, during the design process for the hollowness percentage of the roller, the influences of the radial load and the shaft speed on the vibrations of the bearing components should be considered, except for the fatigue life. The results show that this work can give a new dynamic method for analyzing the vibrations of the HCRBs. Moreover, it can give some guidance for the design method for the HCRBs.

Dynamic analysis of a tapered roller bearing

2018 ◽  
Vol 70 (1) ◽  
pp. 191-200 ◽  
Author(s):  
Sier Deng ◽  
Jinfang Gu ◽  
Yongcun Cui ◽  
Wenhu Zhang
Keyword(s):  
Friction Coefficient ◽  
Differential Equations ◽  
Dynamic Analysis ◽  
Axial Load ◽  
Roller Bearing ◽  
Radial Load ◽  
Content Type ◽  
Tapered Roller Bearing ◽  
Tapered Roller ◽  
The Impact

Purpose This study aims to analyze the roller dynamic characteristics and cage whirling of tapered roller bearing considering roller tilt and skew which provide a theoretical basis for the design and application of tapered roller bearing. Design/methodology/approach Based on rolling bearing dynamic analysis, the dynamic differential equations of tapered roller bearing are established. Fine integral method and predict correct Adams–Bashforth–Moulton multi-step method are used to solve the dynamic differential equations of tapered roller bearings. Findings Friction at the flange contact between roller and large flange is the chief factor of roller skew. In comparison to cone speed, axial loads have more visible effect on roller skew, and proper speed or axial load is beneficial to sustain cage motion and decrease cage instability. Under the combined effort of axial load and radial load, the distribution of roller skew is correlated to the roller-flange contact load. In addition, roller skew angle in loaded zone is larger than that in unloaded zone; hence, it is helpful for cage stability if an extent radial load is applied. The pocket clearance of cage has very small influence on roller skew; therefore, a reasonable pocket clearance is suggested to assure minimum instability of cage. Friction coefficient of flange contact has a large effect on roller skew, and cage whirl is found to demonstrate a circular orbit with increasing friction coefficient. Originality/value The dynamic differential equations of tapered roller bearing considering roller large end/inner ring back face rib contact under various lubrication states were established. The impact of flange friction working conditions and cage pocket clearance on cage instability and roller skew were focused on. It is the first time that the ratio of the standard deviation of the cage-center translational speed to its mean value is used to access the instability of cage in tapered roller bearing.

scholarly journals On the Measurement of Roller Skew of Tapered Roller Bearings

2012 ◽  
Vol 217-219 ◽  
pp. 2328-2331 ◽  
Author(s):  
Abiodun Falodi ◽  
Yong K. Chen ◽  
Martin Caspall ◽  
Brian Earthrowl ◽  
David Dell
Keyword(s):  
Roller Bearing ◽  
Radial Load ◽  
Double Row ◽  
Tapered Roller Bearing ◽  
Roller Bearings ◽  
Variable Reluctance ◽  
Bearing Life ◽  
Tapered Roller ◽  
Tapered Roller Bearings ◽  
New System

Roller skew in roller bearings can cause heat generation and reduce bearing life. Therefore, design to minimise its occurrence is essential in bearing development. This study investigated the roller skew of a double row tapered roller bearing under various running conditions. A new system of measurement using two differential variable reluctance transducers (DVRT) was developed. It is evident that the roller skew of the double row tapered roller bearing can be measured. The shaft rotational speed has a significant effect on roller skew but the radial load has little effect.

Thermal Analysis of Railroad Bearings: Effect of Wheel Heating

2009 ◽  
Author(s):  
Constantine M. Tarawneh ◽  
Arturo A. Fuentes ◽  
Brent M. Wilson ◽  
Kevin D. Cole ◽  
Lariza Navarro
Keyword(s):  
Heat Transfer ◽  
Thermal Analysis ◽  
Roller Bearing ◽  
Railroad Wheel ◽  
Fe Model ◽  
Wheel Pair ◽  
Tapered Roller Bearing ◽  
Excessive Heat ◽  
Tapered Roller ◽  
Railroad Bearings

Catastrophic bearing failure is a major concern for the railroad industry because it can lead to costly train stoppages and even derailments. Excessive heat buildup within the bearing is one of the main factors that can warn of impending failure. A question is often raised regarding the transfer of heat from a wheel during braking and whether this can lead to false setouts. Therefore, this work was motivated by the need to understand and quantify the heat transfer paths to the tapered roller bearing within the railroad wheel assembly when wheel heating occurs. A series of experiments and finite element (FE) analyses were conducted in order to identify the different heat transfer mechanisms, with emphasis on radiation. The experimental setup consisted of a train axle with two wheels and bearings pressed onto their respective journals. One of the wheels was heated using an electric tape placed around the outside of the rim. A total of 32 thermocouples scattered throughout the heated wheel, the axle, and the bearing circumference measured the temperature distribution within the assembly. In order to quantify the heat radiated to the bearing, a second set of experiments was developed; these included, in addition to the axle and the wheel pair, a parabolic reflector that blocked body-to-body radiation to the bearing. The appropriate boundary conditions including ambient temperature, emissivity, and convection coefficient estimates were measured or calculated from the aforementioned experiments. The FE thermal analysis of the wheel assembly was performed using the ALGOR™ software. Experimental temperature data along the radius of the heated wheel, the bearing circumference, and at selected locations on the axle were compared to the results of the FE model to verify its accuracy. The results indicate that the effect of thermal radiation from a hot wheel on the cup temperature of the adjacent bearing is minimal when the wheel tread temperature is at 135°C (275°F), and does not exceed 17°C (31°F) when the wheel tread is at 315°C (600°F).

Effect of tribological parameters on sliding wear and friction coefficient which relates to preload loss in tapered roller bearing

2019 ◽  
Vol 71 (1) ◽  
pp. 61-73 ◽  
Author(s):  
Ayush Jain ◽  
Abhishek Singh ◽  
Arendra Pal Singh
Keyword(s):  
Sliding Wear ◽  
Roller Bearing ◽  
Wear Test ◽  
Thickness Effect ◽  
Surface Parameters ◽  
Content Type ◽  
Tapered Roller Bearing ◽  
Tapered Roller ◽  
Tribological Parameters ◽  
Ball On Disc

Purpose This paper aims to study the sliding wear and coefficient of friction (COF) using “ball on disc” tribometer. Discs of bearing steel were subjected to different tribological parameters such as heat treatment (through hardening and case hardening), sliding speed, sliding distance and micro-geometry of the functional ball and disc point contact. Results obtained from tribometer were correlated with the preload loss in tapered roller bearing. Preload loss is subjected to wear rate pattern with respect to the internal geometry and micro-geometry of functional surfaces of the tapered roller bearing, caused by internal resistance between roller large ends sliding against cone supporting face. This confirms the optimum geometry and physical/mechanical property of the tapered roller bearing, which makes the use of these bearings under the demanding application in the automotive industry such as differential gears and installation of pinions of differential gears in power transmissions or wheels. Design/methodology/approach The paper opted for an exploratory study using the design of experiments with full factorial method. The approach was to do ball on disc sliding wear test and correlate that sliding wear with preload loss in tapered roller bearing. Findings The paper provides the limit of preload loss in tapered roller bearing. Research limitations/implications Because of the chosen research approach, the research lacks the effect of environmental conditions such as temperature and relative humidity and lube film thickness effect on wear test. It also lacks the validation part with actual preload loss on tapered roller bearings. Above work is included in future scope of work. Practical implications This paper includes the recommendation for surface parameters which can increase the bearing life by reducing the preload loss in tapered roller bearing. Social implications This paper includes the recommendation for surface parameters for bearing manufacturing industries. Originality/value This paper provides the relation between sliding wear and preload loss in tapered roller bearing.

Simulationsgestütze Auslegung eines Hochdrehzahl-Kegelrollenlagers/Simulation Based Design of a High-Speed Tapered Roller Bearing

Konstruktion ◽  
2017 ◽  
Vol 69 (07-08) ◽  
pp. 83-90
Author(s):  
Christian Brecher ◽  
Marcel Fey ◽  
Alexander Hassis
Keyword(s):  
High Speed ◽  
Roller Bearing ◽  
Tapered Roller Bearing ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Tapered Roller

Inhalt: Übliche Kegelrollenlager zeichnen sich durch eine im Vergleich zu Spindellagern sehr hohe Steifigkeit und Tragfähigkeit aus. Gleichzeitig ist ihre Drehzahleignung deutlich geringer, was den Einsatz in Werkzeugmaschinen-Hauptspindeln zur Fräsbearbeitung in den meisten Fällen ausschließt. Mit dem hier vorgestellten zweistufigen Verfahren wird ein Kegelrollenlager für den Betrieb bei hohen Drehzahlen ausgelegt. Im ersten Schritt erfolgt die Auslegung der Makrogeometrie durch Lösung eines Optimierungsproblems. Zur Auslegung der Mikrogeometrie kommen in zweiten Schritt Methoden zur Kontaktberechnung und -beschreibung zur Anwendung.

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