Load Capacity of Eccentric Roller Bearings

2020 ◽  
pp. 13-21
Author(s):  
P.N. Silchenko ◽  
G.A. Timofeev ◽  
M.V. Mesnyankin ◽  
E.S. Novikov
Keyword(s):  
Load Distribution ◽  
Load Capacity ◽  
Roller Bearing ◽  
Radial Load ◽  
Roller Bearings ◽  
Ring Radius ◽  
Limiting Load ◽  
Rolling Body ◽  
Minimal Radius ◽  
Actual Stress

Eccentric roller bearings are commonly used in engineering and serve as actuating links in mechanical drives of various machines. Load capacity is one of the main parameters of such bearings. This paper presents possible kinematic schemes of an eccentric roller bearing and the specifics of the actual radial load distribution when it is applied to the driving ring between the rolling bodies. It is established that the load capacity of the eccentric roller bearing depends on the actual stress occurring when the rolling body of the minimal radius and the inner ring raceway are in contact. Equations are obtained for calculating the permissible radial load that the rolling body of the minimal radius with a raceway can bear. The limiting load is determined that satisfies the conditions of contact strength of the bearing’s assembly units and ensures performance of the bearing in a mechanical drive of a machine. The results of determining the limiting load of the eccentric roller bearing and the results’ analysis are presented using a specific example. To ensure the performance of the bearing, the optimal ratio of the inner ring radius to the minimum rolling body radius is determined.

Design of Mould on Cold Rolling for CARB Bearing’s Arc Roller

2012 ◽  
Vol 424-425 ◽  
pp. 838-843
Author(s):  
Luo Ping Zhang ◽  
Bo Ma ◽  
Jing Fu
Keyword(s):  
Cold Rolling ◽  
Structural Design ◽  
Manufacturing Industry ◽  
Load Capacity ◽  
Roller Bearing ◽  
Temperature Stability ◽  
Radial Load ◽  
High Temperature Stability ◽  
Bearing Life ◽  
Rolling Technology

CARB bearing is a kind of compact aligning roller bearing with internal contact and slightly curved surface, which is the most important breakthrough of bearing technology in rencent 50 years. CARB bearing’s special structural design make it has unique advantages, for example, reducing the mechanical structure size, reducing cost, extending bearing life, reducing noise, improving radial load capacity and high temperature stability, etc, so it is widely used in the manufacturing industry. CARB bearing’s roller is cylinder with arc, this unique structure is suitable for adopting cold rolling technology

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.

Fluid Lubrication Theory of Roller Bearing—Part II: Fluid Lubrication Theory Applied to Roller Bearing

1962 ◽  
Vol 84 (1) ◽  
pp. 175-180 ◽  
Author(s):  
Tokio Sasaki ◽  
Haruo Mori ◽  
Norio Okino
Keyword(s):  
Load Capacity ◽  
Roller Bearing ◽  
Lubrication Theory ◽  
Rotating Cylinders ◽  
Roller Bearings ◽  
Bearing Part

Using the theory for two rotating cylinders in contact obtained in Part I, the fluid lubrication theory of roller bearings for Newtonian and non-Newtonian lubricants was developed in Part II with considerations of the influences of unsteady load and sliding of rollers. It is clarified that the load capacity under unsteady load is generally larger than that under constant basic load and the average friction is nearly equal for both cases. The frictional moment and load capacity for roller bearing including sliding of rollers decrease to 2/3 of the amount of those for roller bearing including no sliding.

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.

An Experimental Investigation of Cylindrical Roller Bearings Having Annular Rollers

1976 ◽  
Vol 98 (4) ◽  
pp. 538-543 ◽  
Author(s):  
A. Suzuki ◽  
A. Seireg
Keyword(s):  
Experimental Investigation ◽  
Temperature Rise ◽  
Load Distribution ◽  
Static Load ◽  
Numerical Solutions ◽  
Roller Bearing ◽  
Roller Bearings ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

This study deals with an experimental investigation of a cylindrical roller bearing having annular rollers. Comparisons are made with a solid roller bearing having the same configuration and dimensions. Radial deformations and load distribution between rollers are measured under static load and compared with numerical solutions. Bearing temperature rise and roller wear are investigated in a specially designed tester. A radioactive tracing technique is utilized for the measurement of roller wear and proved to be reliable for wear detection. The results show several advantages of annular rollers over the solid rollers.

scholarly journals An In-Depth Study on Load Distribution Characteristics of the Planetary Threaded Roller Bearing

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Shicheng Zheng ◽  
Yongling Fu ◽  
Junlin Pan ◽  
Linjie Li ◽  
Deyi Wang
Keyword(s):  
Load Distribution ◽  
Roller Bearing ◽  
Distribution Coefficients ◽  
Friction Torque ◽  
Solid Base ◽  
Radial Load ◽  
Loading Conditions ◽  
Obvious Effect ◽  
Property Analysis ◽  
Depth Analysis

To lay a solid base for the property analysis and structural optimization on the high-strength planetary threaded roller bearing (PTRB) which is commonly used in mountain-walking robotic platforms, this research mainly focuses on characterizing the load distribution on the bearing under different loading conditions. An in-depth analysis was performed on the structural components and the contact characteristics of the PTRB. Based on the space meshing and Hertz contact theories, the elastic deformation of both inner and outer rings and the threaded roller was evaluated when the bearing was subjected to an axial or radial load. Meanwhile, a calculation method was proposed to obtain the load distribution coefficients of the PTRB according to the compatibility equations. In this way, an analysis on the load distribution of the PTRB was provided on the basis of the theoretical models. The results indicated that the effect of the applied load was very limited on the load distribution coefficients under an axial loading condition. The maximum value was found at the first thread of the inner ring-threaded roller contact pair, while no obvious effect was found when the bearing was carrying a radial load. It was indicated that the uniformity of the load distribution was effectively improved for axial and radial loading conditions through adjusting the distance between threads and increasing the threaded roller numbers, respectively. Therefore, both the rated load and the life cycle of the bearing can be further improved, while the friction torque can be minimized within a limited space. The research provides an important guidance for the property analysis, design, and optimization of the PTRB.

Dynamic Model of Spherical Roller Bearing

2013 ◽  
Author(s):  
Behnam Ghalamchi ◽  
Jussi T. Sopanen ◽  
Aki M. Mikkola
Keyword(s):  
Load Capacity ◽  
Roller Bearing ◽  
Industrial Applications ◽  
Hertzian Contact ◽  
Design Parameters ◽  
Steel Rolling ◽  
Roller Bearings ◽  
Proposed Model ◽  
Rotor Bearing ◽  
Transient Simulations

Rolling element bearings are essential machine elements in the rotating machinery. Extensive research has been conducted to study the dynamics of ball bearings, while studies related to spherical roller bearings are short-shrifted. On the other hand, the number of industrial applications that utilize spherical roller bearings has been increasing constantly. This is due to self-aligning nature and high-load capacity of spherical roller bearings. Typical applications are paper machines, steel rolling, marine equipment, geared transmissions and modern high power wind turbines. This study introduces a three-degree-of-freedom spherical roller bearing model that is computationally efficient, and it is designed to be used in the transient simulations of complete rotor-bearing systems. In the proposed model, the bearing forces are calculated as a function of contact deformation and bearing geometry parameters according to the non-linear Hertzian contact theory. In the numerical results, the important bearing design parameters such as diametral clearance, number of rollers and osculation are studied. Existence of varying compliance (VC) vibrations and the capability of the proposed model in the transient simulations of rotor-bearing systems are demonstrated. The bearing model is verified by using commercial bearing analysis software. Future improvements and model extension possibilities are also discussed.

Fluid Lubrication Theory of Roller Bearing—Part I: Fluid Lubrication Theory for Two Rotating Cylinders in Contact

1962 ◽  
Vol 84 (1) ◽  
pp. 166-174 ◽  
Author(s):  
Tokio Sasaki ◽  
Haruo Mori ◽  
Norio Okino
Keyword(s):  
High Speed ◽  
Load Capacity ◽  
Roller Bearing ◽  
Lubrication Theory ◽  
Plastic Viscosity ◽  
Fundamental Theory ◽  
Rotating Cylinders ◽  
Bingham Plastic ◽  
Roller Bearings ◽  
Bearing Part

This paper which consists of Parts I and II presents a general and practical fluid lubrication theory of roller bearings lubricated by Newtonian and non-Newtonian lubricants with considerations to the effect of sliding of roller and the influence of unsteady load. In Part I, the fundamental theory for the lubrication between two rotating cylinders in contact has been investigated. The load capacity and friction of a non-Newtonian lubricant, supposed to be a Bingham plastic, coincide approximately at high speed with those of a Newtonian lubricant with viscosity equivalent to the plastic viscosity of the non-Newtonian lubricant. Under unsteady loads, the squeeze action works effectively so that the load capacity increases. The amount of friction is 4/3 and the load capacity is 2/3 in the case of two rotating cylinders in contact involving sliding, compared with that involving no sliding.

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