optimized logarithmic roller crowning design of

Crown Analysis of Needle Roller Bearing Based on Finite

2018-5-10design parameters were introduced into the profile and the profile could prevent edge stress due to misalignment However these parameters are not easy to choose and only be optimized in a small range thus the profile is not used widely in the roller bearing design So far the roller crown shapes mainly include arc and logarithmic profiles [8]

METHOD OF MANUFACTURING A ROLLER BEARING

2019-12-41 A method of manufacturing a roller bearing in which a plurality of rollers (13) are interposed between an inner ring raceway (11a) and an outer ring raceway (12a) and a crowning (13b 13c) is formed on at least one of the inner ring raceway (11a) the outer ring raceway (12a) and a roller rolling contact surface (13a) wherein: a drop amount of the crowning (13b 13c) at an end of an

Improving the load carrying capacity of Cylindrical Roller

2016-8-10Thus the crowning profile should be optimized by considering sub surface stress components Design of the roller according to its profile load carrying Hiroki Fujiwara Tatsuo Kawase "Logarithmic Profiles of Rollers in Roller Bearings and Optimization of the Profiles" JSME Part C Vol 72 pp 3022 – 3029 2006

US Patent for Tapered roller bearing and method of

In a tapered roller bearing assembly a crowning profile formed portion of the roller rolling surface is made up of a contact area crowned portion which is held in contact with an inner ring raceway surface and a non-contact area crowned portion which is held in non-contact with the inner ring raceway surface The contact area crowned portion and the non-contact area crowned portion have

Optimization of Contact Profiles using Super

In recent years crowning shapes based on a logarithmic function developed by Lundberg have been improved and optimized for the purpose of industrialization However the resulting profiles are fairly complex and have only been developed for roller bearings and

Tapered roller bearing and method of designing the

2014-10-14The tapered roller bearing assembly as claimed in claim 4 wherein the generatrix of the contact area crowned portion is formed by a logarithmic curve of the logarithmic crowning profile expressed by the following formula: z ⁡ (y) = A ⁢ ⁢ ln ⁢ 1 1-{1-exp ⁡ (-z m A)} ⁢ (y-a K 2 ⁢ a + 1) 2 where A represents 2K 1 Q/πIE′ a

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2016-11-17The results show that the logarithmic crowning has an optimal effect on contact stress distribution However the optimum modification curve corresponds to the actual working conditions Moreover the contact stress distribution of tapered roller/raceway contact pair is not symmetrical about the center line of roller and the contact stress of the small end of roller is greater than the stress

Crown Analysis of Needle Roller Bearing Based on Finite

2018-5-10design parameters were introduced into the profile and the profile could prevent edge stress due to misalignment However these parameters are not easy to choose and only be optimized in a small range thus the profile is not used widely in the roller bearing design So far the roller crown shapes mainly include arc and logarithmic profiles [8]

A Design Method for a New Type of Cylindrical Roller

Reusner H Logarithmic roller profile-the key to superior performance of cylindrical and taper roller bearings Ball Bearing J 1987 230: 2-10 [9] Ma J Elastic Contact Force and Deformation Calculation of Roller Bearing Luoyang: Luoyang Bearing Research Institute 1977 [10] Chem X Research on Optimal Design and CAD Needle Roller Bearing

Crown Analysis of Needle Roller Bearing Based on Finite

2018-5-10design parameters were introduced into the profile and the profile could prevent edge stress due to misalignment However these parameters are not easy to choose and only be optimized in a small range thus the profile is not used widely in the roller bearing design So far the roller crown shapes mainly include arc and logarithmic profiles [8]

The results show that the logarithmic crowning has an optimal effect on contact stress distribution However the optimum modification curve corresponds to the actual working conditions Moreover the contact stress distribution of tapered roller/raceway contact pair is not symmetrical about the center line of roller and the contact stress of the small end of roller is greater than the stress

Tolerance Design of Logarithmic Roller Profiles in

2010-12-10crowning region length to the effective roller length and the crown drop at the crowning region ends respectively We take a NU304E cylindrical roller bearing as an example of a logarithmic crowning design under the condition given in Table 2 Cylindrical bearing

An Optimal Design Methodology of Tapered Roller

2018-6-3In the design of tapered roller bearings long life is the one of the most important criterion The design of bearings has to satisfy constraints of geometry and strength while operating at its rated speed An optimal design methodology is needed to achieve this objective (i e the maximization of the fatigue life) The fatigue life is directly proportional to the dynamic capacity hence

Analytical Modeling and Optimization of Logarithmic

The logarithmic roller profile is shown in Figure 3 and its formulation is given as where is the crown drop at the axial position is equivalent Young's modulus is the load is the effective length of the sprag roller and and correspond to the crowning curvature the ratio of the crowing region length to the effective roller

Journal of Advanced Mechanical Design Systems and

A logarithmic profile is essentially optimal crowning geometry for rolling machine elements such as bearing rollers and raceways Although some design methods of the profile have been proposed they do not refer to the tolerance of the geometry required in engineering applications and in production

A Computational Method for Contact Deformation of

This paper presents a new method called data fitting method based on numerical results to calculate the contact deformation between logarithmical crowned roller and raceway of rolling bearings First the contact deformations between logarithmically crowned roller and raceway are analyzed and numerically calculated according to influence coefficient method and then a fitting formula based

IOP Conference Series: Materials Science and Engineering

[12] brought important improvements but his work was mostly dedicated to tapper roller logarithmic profiles and it was mention here only for historical reasons Fujiwara et al [13] provided a logarithmic crowning equation by introducing three design parameters into Johns and Gohar's formula to improve the flexib ility of the profile design

The design parameter of logarithmic crown profile is determined after analyzing the effect of crowning parameter on stress distribution and bearing's fatigue life under the given conditions By introducing the fatigue life of bearing as the objective function in the crowning design the optimal logarithmic crowning parameter can be obtained quantitatively

Optimum design of the roller profile based on the

2019-9-12Roller profile modification is often used to unify the pressure distribution and to prolong the life of the roller In this paper the formula of the optimum modification coefficient for the logarithmically profiled roller is derived to design the roller profile based on the elastohydrodynamic lubrication model of finite-length line contact

Roller profiling to increase rolling bearing

Fujiwara H Kobayashi T Kawase T and Yamauchi K 2010 Optimized Logarithmic Roller Crowning Design of Cylindrical Roller Bearings and Its Experimental Demonstration Tribology Transactions 53 909-916 Crossref Google Scholar Tudose L Ursache C

RBC Now Offers Tyson Tapered Roller Bearings

2020-7-15Even under a heavy misaligned load Tyson's logarithmic design more evenly distributes stresses when compared with straight profile or circular crowning According to RBC Tyson Tapered Roller Bearings are manufactured under QS 9000 and ISO 9001:2000 certified quality systems from a high grade of case- hardened bearing-quality steel

Tapered roller bearing and method of designing the

2014-10-14The tapered roller bearing assembly as claimed in claim 4 wherein the generatrix of the contact area crowned portion is formed by a logarithmic curve of the logarithmic crowning profile expressed by the following formula: z ⁡ (y) = A ⁢ ⁢ ln ⁢ 1 1-{1-exp ⁡ (-z m A)} ⁢ (y-a K 2 ⁢ a + 1) 2 where A represents 2K 1 Q/πIE′ a

Study on Logarithmic Crowning of Tapered Roller

In this paper based on the angular misalignment the geometric interference model of the tapered roller contact pair was established And two types of logarithmic crowning models for the roller profile design were theoretically deduced in which design redundancy was considered through the quadratic processing of the pre-pressure

Optimization of partially crowned roller profiles for

The roller profile plays a key role in the overall performance of roller bearings In traditional profile design for roller bearings the roller profile was often analyzed in terms of the bearing performance particularly the fatigue life However the bearing dynamic stiffness and fatigue life were seldom considered simultaneously in the design of Tapered roller bearings (TRBs)

The results show that the logarithmic crowning has an optimal effect on contact stress distribution However the optimum modification curve corresponds to the actual working conditions Moreover the contact stress distribution of tapered roller/raceway contact pair is not symmetrical about the center line of roller and the contact stress of the small end of roller is greater than the stress

US Patent for Tapered roller bearing and method of

In a tapered roller bearing assembly a crowning profile formed portion of the roller rolling surface is made up of a contact area crowned portion which is held in contact with an inner ring raceway surface and a non-contact area crowned portion which is held in non-contact with the inner ring raceway surface The contact area crowned portion and the non-contact area crowned portion have