scholarly journals Ball's motion, sliding friction, and internal load distribution in a high-speed ball bearing subjected to a combined radial, thrust, and moment load, applied to the inner ring's center of mass:Mathematical model

2015 ◽  
Vol 641 ◽  
pp. 012017
Author(s):  
Mário César Ricci
Keyword(s):  
Load Distribution ◽  
High Speed ◽  
Ball Bearing ◽  
Sliding Friction ◽  
Internal Load ◽  
Radial Thrust ◽  
Moment Load

Sticking of a Linear-Guideway Type Recirculating Ball Bearing

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
Hiroyuki Ohta ◽  
Genta Hanaoka ◽  
Yusuke Ueki
Keyword(s):  
Driving Force ◽  
Ball Bearing ◽  
Sliding Friction ◽  
Stroke Length ◽  
Rolling Moment ◽  
Moving Body ◽  
Moment Load ◽  
Rolling Balls

In this paper, the driving force of a linear-guideway type recirculating ball bearing (linear bearing) is measured and explained as the first step toward an understanding of sticking, which is the significant increase in driving force required to move a linear bearing under back-and-forth operation with a short stroke length. First, the driving force required for operation of a test bearing (which is a linear-guideway type recirculating ball bearing with load balls) and acceleration of a moving body (which consists of a carriage of the test bearing, an arm, and weight) were measured. The measurements showed that the sticking occurred when the test bearing, under a relatively higher rolling moment load, was driven in an offset position for a certain period. Next, the driving force of a test bearing with alternating load balls and spacer balls was measured, and it was clear that the cause of the sticking was the sliding friction between rolling balls. Finally, the ball locations in the load zone of the test bearing with load balls were observed in operation, and the occurrence process of the sticking is explained.

Research on Numerical Problem in the Simulation Statics Analysis Program of High Speed Ball Bearing

2013 ◽  
Vol 376 ◽  
pp. 248-252
Author(s):  
Ming Yan ◽  
Ming Ming Wang ◽  
Xiang Jun Zhu
Keyword(s):  
Contact Angle ◽  
Fatigue Life ◽  
Load Distribution ◽  
High Speed ◽  
Ball Bearing ◽  
Theoretical Research ◽  
Analysis Program ◽  
Numerical Problem ◽  
Rolling Element

Load distribution, contact angle, rotate speed of rolling element, support stiffness of bearing, fatigue life and other aggregative indicators are got through the simulation statics analysis program of high speed ball bearing. Consequently, it is widely used in the engineering field. The domestic thesis about the simulation statics analysis program of the high speed ball bearing is barely reported, and most of the theoretical research thesis are not specific and have some mistakes. Consequently, aim for programming about a practical suit of the simulation statics analysis program of ball bearing, and the certain numerical problems are studied in the procedure of program.

Estimation for Bearing Preload of Machine Tool Spindle Based on Vibration Signal

2012 ◽  
Vol 236-237 ◽  
pp. 1251-1257 ◽  
Author(s):  
Tao Xu ◽  
Guang Hua Xu ◽  
Qing Zhang ◽  
Cheng Hua ◽  
Qian Qian He
Keyword(s):  
Machine Tool ◽  
Load Distribution ◽  
High Speed ◽  
Vibration Signal ◽  
Contact Angles ◽  
Operating Conditions ◽  
Internal Load ◽  
Machine Tool Spindle ◽  
Surface Irregularities ◽  
Bearing Preload

A significant source of noise and vibration in high speed machine tool spindle is bearing induced vibration, which is caused by geometrical characteristics and interactions between rolling members with surface irregularities. In this paper, analytical approach was proposed to calculate the bearing internal load distribution of spindle, with consideration of the operating conditions. The influences of operating conditions to internal load distribution, contact angles were analyzed. Furthermore, the estimation of power spectral density (PSD) method was used to analyze determination of bearing frequencies. The bearing preload of machine tool spindle was estimated according to the change of ball bearing frequencies. Experiments were carried out in a spindle bearing test rig to verify the validity of the presented analytical method. The method described in this paper can achieve the estimation for bearing preload of machine tool spindle.

scholarly journals Ball Motion and Sliding Friction in an Arched Outer Race Ball Bearing

1975 ◽  
Vol 97 (2) ◽  
pp. 202-210 ◽  
Author(s):  
B. J. Hamrock
Keyword(s):  
Fatigue Life ◽  
High Speed ◽  
Ball Bearing ◽  
Sliding Friction ◽  
Outer Race ◽  
Light Load ◽  
Thrust Load ◽  
Ball Motion ◽  
Life Evaluations

The motion of the ball and sliding friction in an arched outer-race ball bearing under thrust load is determined. Fatigue life evaluations were made. The analysis is applied to a 150 millimeter bore ball bearing. The results indicated that for high speed-light load applications the arched bearing has significant improvement in fatigue life over that of a conventional bearing. An arching of 0.254 mm (0.01 in.) was found to be an optimal. For an arched bearing it was also found that a considerable amount of spinning occurs at the outer race contacts.

Ball bearing turbocharger vibration management: application on high speed balancer

2020 ◽  
Vol 21 (6) ◽  
pp. 619
Author(s):  
Kostandin Gjika ◽  
Antoine Costeux ◽  
Gerry LaRue ◽  
John Wilson
Keyword(s):  
Dynamic Behavior ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Ball Bearing ◽  
Squeeze Film ◽  
Design And Technology ◽  
Squeeze Film Damper ◽  
Damping Coefficients ◽  
Bearing Loads ◽  
Stiffness And Damping

Today's modern internal combustion engines are increasingly focused on downsizing, high fuel efficiency and low emissions, which requires appropriate design and technology of turbocharger bearing systems. Automotive turbochargers operate faster and with strong engine excitation; vibration management is becoming a challenge and manufacturers are increasingly focusing on the design of low vibration and high-performance balancing technology. This paper discusses the synchronous vibration management of the ball bearing cartridge turbocharger on high-speed balancer and it is a continuation of papers [1–3]. In a first step, the synchronous rotordynamics behavior is identified. A prediction code is developed to calculate the static and dynamic performance of “ball bearing cartridge-squeeze film damper”. The dynamic behavior of balls is modeled by a spring with stiffness calculated from Tedric Harris formulas and the damping is considered null. The squeeze film damper model is derived from the Osborne Reynolds equation for incompressible and synchronous fluid loading; the stiffness and damping coefficients are calculated assuming that the bearing is infinitely short, and the oil film pressure is modeled as a cavitated π film model. The stiffness and damping coefficients are integrated on a rotordynamics code and the bearing loads are calculated by converging with the bearing eccentricity ratio. In a second step, a finite element structural dynamics model is built for the system “turbocharger housing-high speed balancer fixture” and validated by experimental frequency response functions. In the last step, the rotating dynamic bearing loads on the squeeze film damper are coupled with transfer functions and the vibration on the housings is predicted. The vibration response under single and multi-plane unbalances correlates very well with test data from turbocharger unbalance masters. The prediction model allows a thorough understanding of ball bearing turbocharger vibration on a high speed balancer, thus optimizing the dynamic behavior of the “turbocharger-high speed balancer” structural system for better rotordynamics performance identification and selection of the appropriate balancing process at the development stage of the turbocharger.

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