scholarly journals Technological increase of static load carrying capacity of local raceways in ball bearings through ball rolling-off

2018 ◽  
Vol 2018 (12) ◽  
pp. 28-32
Author(s):  
Альберт Королев ◽  
Albert Korolev ◽  
Михаил Захарченко ◽  
Mihail Zakharchenko ◽  
Кристина Мищенко ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Ball Bearing ◽  
Static Load ◽  
Ball Bearings ◽  
Load Carrying Capacity ◽  
Combined Load ◽  
Ball Rolling ◽  
Load Carrying ◽  
Bearing Rings ◽  
External Loads

The paper reports the consideration of the ball rolling-off mechanism of ball bearing rings. The regularities of the distribution of external combined load between balls are defined. There is offered a simulator of a rolling-ff process allowing the ratio definition between a load upon balls and acting factor including the angle of balls contact with a race and a correlation of a radial and axial external loads.

scholarly journals The static load carrying capacity of a corner joint of concrete filled circular steel column.

2002 ◽  
pp. 13-27 ◽  
Author(s):  
Noriyuki HORICHI ◽  
Tetsuya HOSAKA ◽  
Teruhiko YODA ◽  
Shinichi KATSUO
Keyword(s):  
Carrying Capacity ◽  
Static Load ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Steel Column

scholarly journals Contact Analysis and Static Load Carrying Capacity of Planetary Roller Screw Mechanism

2020 ◽  
Author(s):  
Nam Su Kim ◽  
Kyongho Kim ◽  
Sinhyok Jong
Keyword(s):  
Finite Element ◽  
Contact Stress ◽  
Carrying Capacity ◽  
Static Load ◽  
Load Capacity ◽  
Load Carrying Capacity ◽  
Elastic Plastic ◽  
Load Carrying ◽  
Roller Screw ◽  
Screw Mechanism

Abstract This paper aims to investigate the contact characteristics and static load carrying capacity of planetary roller screw mechanism (PRSM). Compared to the ball screw mechanism, the advantages of the PRSM are high stiffness, high load capacity, long travel life and compact structure, etc., since the PRSM possesses more contact points than ball screws in a comparable size. The actuated load is carried through the threaded surface contacts of the screw, the rollers and the nut and the contact characteristics of these components are very important for studying the wear, transmission accuracy and efficiency of a PRSM. Prior work has neglected to take a fundamental approach towards understanding the elastic-plastic contact characteristics of threaded surfaces under high loads and it is closely related to the static load carrying capacity of PRSM. Accordingly, in this paper, the contact characteristics of PRSM under the different working loads are modeled based on Hertz contact theory and the calculation formulas between normal force of thread turns and the elastic-plastic contact stress and deformation are derived. Then, it goes further to derive a calculation method of static load carrying capacity of PRSM based on simplified model of static load distribution. Finally, a verification model is developed by finite element method (FEM) to perform contact stress and strain analysis of PRSM. Besides, through the comparison of the results between the theory model and ANSYS Workbench finite element model verify the reliability of the theory.

scholarly journals Research on the Mechanical Properties of “Z” Type Double-Decker Ball Bearings

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Chengtao Yu ◽  
Longxiang Xu ◽  
Xudong Yu
Keyword(s):  
Contact Angle ◽  
Carrying Capacity ◽  
High Speed ◽  
Static Load ◽  
Radial Deformation ◽  
Load Carrying Capacity ◽  
Heavy Load ◽  
Double Decker ◽  
Load Carrying ◽  
Simulation Results

The mechanical model of a “Z” type double-decker ball bearing under the action of radial load is established in this paper on the basis of the Hertz contact theory. According to the security contact angle theory, the influences of inner and outer bearings' internal clearances on the bearing's static load carrying capacity, radial deformation, radial stiffness, and load distribution of balls are analyzed. This model is verified in both stationary and rotational loading experiments. Moreover, the simulation results show that the static load carrying capacity of Z type bearing is smaller than that of either inner bearing or outer bearing that is contributed to compose the Z type bearing. The static load carrying capacity of a Z type bearing reduces with the increase of the inner and outer bearings' internal clearance. These simulation results also indicate that the contact angle of the maximum loaded ball in the outer bearing easily exceeds its security contact angle compared with the inner bearing, which, as the main factor, may cause the Z type bearing to overload and to fail. In this sense, the investigated Z type bearings are unfit to apply to situations with heavy load, high speed, or high precision.

Static Load Carrying Capacity in Four Contact Point Slewing Bearings: Theoretical and Preliminary Finite Element Calculations

2010 ◽  
Author(s):  
Josu Aguirrebeitia ◽  
Mikel Abasolo ◽  
Rafael Avile´s ◽  
Igor Fernandez de Bustos ◽  
Rube´n Ansola
Keyword(s):  
Finite Element ◽  
Theoretical Model ◽  
Finite Element Model ◽  
Carrying Capacity ◽  
Static Load ◽  
Contact Point ◽  
Element Model ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Slewing Bearings

This paper presents a theoretical model to calculate the general static load-carrying capacity of four-contact-point slewing bearings under axial, radial and tilting-moment loads, compared with preliminary results obtained from a detailed parametric finite element model of the bearing. The theoretical model is based on a generalization of Sjova¨ll and Rumbarger’s equations and provides an acceptance surface in the load space. The finite element model is based on the modelization of the balls via nonlinear traction-only equivalent spring concept. The aim is to validate the theoretical model to be used as an acceptance curve generator for slewing bearing design.

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