scholarly journals FRICTION PROPERTIES AND DISTRIBUTION RULE OF LUBRICANT FILM OF FULL CERAMIC BALL BEARING UNDER DIFFERENT SERVICE CONDITION

2021 ◽  
pp. 0-0
Author(s):  
Jian Sun
Keyword(s):  
Ball Bearing ◽  
Service Condition ◽  
Lubricant Film ◽  
Ceramic Ball ◽  
Distribution Rule

Ceramic ball bearing acoustic test method

2008 ◽  
Vol 124 (5) ◽  
pp. 2673
Author(s):  
Michael J. O’Brien
Keyword(s):  
Ball Bearing ◽  
Test Method ◽  
Ceramic Ball

scholarly journals Monitoring of Lubricant Film Failure in a Ball Bearing Using Ultrasound

2006 ◽  
Vol 128 (3) ◽  
pp. 612-618 ◽  
Author(s):  
Jie Zhang ◽  
Bruce W. Drinkwater ◽  
Rob S. Dwyer-Joyce
Keyword(s):  
Reflection Coefficient ◽  
Ball Bearing ◽  
Ultrasonic Transducer ◽  
Lubricant Film ◽  
Acetone Water ◽  
Deep Groove ◽  
Deep Groove Ball Bearing ◽  
Ball Diameter ◽  
Ultrasonic Reflection Coefficient ◽  
Measurement Location

A lubricant-film monitoring system for a conventional deep groove ball bearing (type 6016, shaft diameter 80 mm, ball diameter 12.7 mm) is described. A high-frequency (50 MHz) ultrasonic transducer is mounted on the static outer raceway of the bearing. The transducer is focused on the ball-raceway interface and used to measure the reflection coefficient of the lubricant in the “contact” ellipse between bearing components. The reflection coefficient characterizes the lubricant film and can be used to calculate its thickness. An accurate triggering system enables multiple reflection measurements to be made as each lubricated contact moves past the measurement location. Experiments are described in which bearings were deliberately caused to fail by the addition of acetone, water, and sand to the lubricant. The ultrasonic reflection coefficient was monitored as a function of time as the failure occurred. Also monitored were the more standard parameters, temperature and vibration. The results indicate that the ultrasonic measurements are able to detect the failures before seizure. It is also observed that, when used in parallel, these monitoring techniques offer the potential to diagnose the failure mechanism and hence improve predictions of remaining life.

Vibrations of the All-Ceramic Ball Bearing

2002 ◽  
Vol 124 (3) ◽  
pp. 448-460 ◽  
Author(s):  
Hiroyuki Ohta ◽  
Shinya Satake
Keyword(s):  
Natural Vibration ◽  
Ball Bearing ◽  
Axial Direction ◽  
Outer Ring ◽  
Ball Bearings ◽  
Ceramic Ball ◽  
Vibration Spectra ◽  
All Ceramic ◽  
Hybrid Ceramic ◽  
Mass Type

All-ceramic ball bearings with silicone nitride balls and silicone nitride rings were tested and the vibration characteristics were compared with those of hybrid ceramic ball bearings and conventional steel ball bearings. The vibration measurement results showed that the overall vibratory velocity levels of the all-ceramic ball bearings are influenced by rotational velocities, and do not change with axial loads. Under a given axial load and rotational velocity, the overall vibratory velocity level of the all-ceramic ball bearing is the lowest, and the hybrid ball bearing the highest. The frequencies of main peaks in the measured vibration spectra of the all-ceramic ball bearing are higher than the frequencies of the corresponding main peaks for the hybrid ceramic ball bearing and the steel ball bearing. To explain the main peaks, modal analysis was done and the relationship between peak and natural vibration was analyzed. The results of the analyses showed that the main peaks are caused by: (1) the mass-type natural vibration of the outer ring in the vertical direction, (2) the bending natural vibration of the outer ring in the radial direction, (3) the moment of inertia-type natural vibration of the outer ring in the angular direction, (4) the mass-type natural vibration of the outer ring in the axial direction, and (5) the bending natural vibration of the outer ring in the axial direction. We also discuss the generating mechanism of the vibration and present the calculation method of the vibration spectra. As a result, it is clear that the vibration spectra of the all-ceramic ball bearing are determined by the amplitude of the waviness of the raceways and ball surface, the mobility, and the non-linear spring constant associated with the contact between the raceways and balls.

The Performance of a Hybrid Ceramic Ball Bearing Under High Speed Conditions with the Under-Race Lubrication Method

1997 ◽  
Vol 40 (4) ◽  
pp. 676-684 ◽  
Author(s):  
Y. Shoda ◽  
S. Ijuin ◽  
H. Aramaki ◽  
H. Yui ◽  
K. Toma
Keyword(s):  
High Speed ◽  
Ball Bearing ◽  
Ceramic Ball ◽  
Hybrid Ceramic

Measurement of Indentation Fracture Toughness of Silicon Nitride Ceramics: I, Effect of Microstructure of Materials

2007 ◽  
Vol 352 ◽  
pp. 41-44 ◽  
Author(s):  
Hiroyuki Miyazaki ◽  
Hideki Hyuga ◽  
Yuichi Yoshizawa ◽  
Kiyoshi Hirao ◽  
Tatsuki Ohji
Keyword(s):  
Fracture Toughness ◽  
Silicon Nitride ◽  
Crack Length ◽  
Ball Bearing ◽  
Indentation Fracture ◽  
Ceramic Ball ◽  
Nitride Ceramics ◽  
Indentation Fracture Toughness ◽  
Effect Of Microstructure

Effect of microstructure of silicon nitride on the fracture toughness, KIc evaluated by the IF method was studied with various indentation loads ranging from 49 N to 490 N, since practical assessment of fracture toughness of small Si3N4 parts is needed in the ceramic ball bearing market. The plot of KIc against the as-indented crack length revealed the rising R-curve behavior for the coarse Si3N4 and slight R-curve for the fine Si3N4. By comparing KIc estimated from the SEPB and IF methods using 4 different equations, it was revealed that the IF equation which gave the nearest value to KIc from SEPB was different depending on the microstructures. These results were discussed in conjunction with their R-curve behavior and the effective crack length in the SEPB specimens.

An Accurate Method for Calculating the Contact Subsurface Stress Field of Hybrid Ceramic Ball Bearing

2011 ◽  
Vol 175 ◽  
pp. 215-218 ◽  
Author(s):  
Cheng Wang ◽  
Wei Yu ◽  
Cheng Zu Ren
Keyword(s):  
Fatigue Life ◽  
Stress Field ◽  
Ball Bearing ◽  
Accurate Method ◽  
Contact Deformation ◽  
The Finite Element Method ◽  
Ceramic Ball ◽  
Closed Form Analytical Solution ◽  
Subsurface Stress ◽  
Hybrid Ceramic

In order to predict fatigue life of hybrid ceramic ball bearing (HCBB) by Ioannides and Harris (IH) theory, the contact subsurface stress field is needed. The contact surfaces of ball and race groove are compatible. The closed-form analytical solution of compatible contact problem is hard to be obtained. The Finite Element Method (FEM) together with submodel technology is adopted to accurately and efficiently calculate the contact deformation and subsurface stress of ball–race groove contact. The result indicated that, the FEM with submodel technology considers the real contact deformation of ball-race groove, and can accurately and efficiently calculate the subsurface stress field. It is believed that the calculated subsurface stress field can be used in IH theory to predict fatigue life of HCBB.

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