Papers by Keyword: Ball Bearings

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Authors: Anna Rudawska, Grzegorz Talatycki
Abstract: The article presents selected issues associated with the use of adhesive joints in the assembly of ball bearings in the gearbox housing. The aim of the study was the comparative analysis of adhesive joints strength of gear bearing housings. One series of rings, simulating the new socket fits with different parameters and different degrees of wear were used to comparison of these joints.The tests were conducted on two series of rings, to represent new housing of different fit parameters and wear variants. The three types of tested adhesives are frequently found in similar applications. The rings and two types of bearings were tested: single row ball bearings 6207Z and tapered roller bearings 30207A. The comparative analysis of tested adhesives indicates the superiority of Loctite products over Chester Molecular B36 adhesive. In tapered roller bearings Loctite 542 produced the strongest bond.
Authors: Waldemar Karaszewski
Abstract: The properties of ceramics, specifically low density, high hardness, high temperature capability and low coefficient of thermal expansion are of most interest to rolling element manufacturers. Surface ring cracks on lubricating rolling contact fatigue failure has been studied using numerical fracture analysis. Such cracks are very often found on ceramic bearing balls and decrease fatigue life rapidly. The numerical calculations are based on a three-dimensional model of the ring crack. The stress intensity factors along crack front are analyzed using a finite element analysis. The numerical analysis is verified by experimental studies.
Authors: Piotr Garbacz, Piotr Czajka
Abstract: The article presents the optical inspection method for the correct assembly of bearings with rolling elements in the form of balls. During the assembly process, faults can occur of incomplete fill of the rolling elements in a bearing cage or a lack of rivets for fixing both parts of the cage. These are critical defects, disqualifying the bearing from the operation. In order to detect these faults, the method of backlighting was used in the form of a modular LED panel illuminator located under the inspected bearing. The chosen method of lighting provides a high contrast and good sharpness with a simultaneous low sensitivity to contamination that may arise in the field of view of the camera. In order to verify the developed method, an experimental automated research stand was made. For vision inspection, a modular vision controller with a monochromatic CCD camera was used. Due to the range of bearings subjected to vision inspection, the algorithm of the program allows automatic detection of the bearing type based on its characteristics. The operation of the vision system was presented for each of the individual stages of the inspection process. The functions used in the field of computer-based image processing and analysis were described. Examples of bearing inspections, with use of the developed method, were presented.
Authors: Paweł Romanowicz, Bogdan Szybiński
Abstract: The methodology of the fatigue load and the bearing life estimation for the ball bearings is presented in the paper. The proposed algorithm is based on the elliptical contact solution and the application of the multi-axial high-cycle fatigue criterion. As the example the radial 6204* and thrust 51104 ball bearings are investigated (SKF). The maximal fatigue loadings are calculated for different geometry (race conformity ratio) and the bearing life of the bearings. The proposed model is also verified with use of the finite element calculations.
Authors: Marek Jałbrzykowski, Jerzy Nachimowicz
Abstract: The paper presents selected results of tribological tests on ball bearings. The elements for tests were obtained from their manufacturer. Two groups of ball bearings were evaluated: 134-781TNG-2RS and CBK 441TNG. Tribological tests were conducted with SMT-1 device in two-stage cycle. The first stage involved tests based on the authors’ own method. In the second stage the tests were conducted according to the manufacturer’s recommendations (methodology). The obtained results indicate varied tribological characteristics of the tested ball bearings, both in reference to the parameters of the external function and the applied test method.
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