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

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.

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