Investigation of Bearing Axial Cracking: Benchtop and Full ...
Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No....
Transcript of Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No....
![Page 1: Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No. Boundary dinm (Þd x x T) apered roller bearings - 2011JR mm Single-row - Metric series](https://reader035.fdocuments.us/reader035/viewer/2022062509/610588e70f244e662237afdf/html5/thumbnails/1.jpg)
Induced Axial Load
Fac = 20kN/(2x1.48) = 6.76kN
![Page 2: Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No. Boundary dinm (Þd x x T) apered roller bearings - 2011JR mm Single-row - Metric series](https://reader035.fdocuments.us/reader035/viewer/2022062509/610588e70f244e662237afdf/html5/thumbnails/2.jpg)
Preload vs. Displacement
𝛿𝑎 =0.000077
sin(𝛼)∙𝑄0.9
𝐿𝑤𝑒0.8
𝑄 =𝐹𝑎
𝑍𝑠𝑖𝑛(𝛼)=
4.32
25 ∙ sin(15.287)= 0.655𝑘𝑁
𝛿𝑎 =0.000077
sin(15.287)∙6550.9
150.8= .01146 ≈ 11.5𝜇𝑚
https://koyo.jtekt.co.jp/en/support/calculation-tool/
4323N = 11.3µm
Roller and Raceway Profiles Can Dramatically Change Masta Stiffness
![Page 3: Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No. Boundary dinm (Þd x x T) apered roller bearings - 2011JR mm Single-row - Metric series](https://reader035.fdocuments.us/reader035/viewer/2022062509/610588e70f244e662237afdf/html5/thumbnails/3.jpg)
Optimizing PreloadLife with no preload 40kN
10kN
100hrs
![Page 4: Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No. Boundary dinm (Þd x x T) apered roller bearings - 2011JR mm Single-row - Metric series](https://reader035.fdocuments.us/reader035/viewer/2022062509/610588e70f244e662237afdf/html5/thumbnails/4.jpg)
![Page 5: Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No. Boundary dinm (Þd x x T) apered roller bearings - 2011JR mm Single-row - Metric series](https://reader035.fdocuments.us/reader035/viewer/2022062509/610588e70f244e662237afdf/html5/thumbnails/5.jpg)
![Page 6: Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No. Boundary dinm (Þd x x T) apered roller bearings - 2011JR mm Single-row - Metric series](https://reader035.fdocuments.us/reader035/viewer/2022062509/610588e70f244e662237afdf/html5/thumbnails/6.jpg)
25µm
50µm
Optimizing left preload results in 2% improvement but reduces right by 1.5%
![Page 7: Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No. Boundary dinm (Þd x x T) apered roller bearings - 2011JR mm Single-row - Metric series](https://reader035.fdocuments.us/reader035/viewer/2022062509/610588e70f244e662237afdf/html5/thumbnails/7.jpg)
Add Temperature
Left
Right
Left
Right
Preload Test
No Temperature
![Page 8: Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No. Boundary dinm (Þd x x T) apered roller bearings - 2011JR mm Single-row - Metric series](https://reader035.fdocuments.us/reader035/viewer/2022062509/610588e70f244e662237afdf/html5/thumbnails/8.jpg)
Aluminum Housing α1 = 23.7x10-6 (1/ ⁰C)Steel α2 = 12.5x10-6 (1/ ⁰C)Shaft 60⁰C
∆𝐿𝑇2 = 𝛼2∆𝑇𝐿 = (12.5x10-6)(60-23)(300) = 0.138mm
Housing 60⁰C∆𝐿𝑇1 = 𝛼1∆𝑇𝐿 = (23.7x10-6)(60-23)(300) = 0.263mm∆𝐿𝑇1,2 = 0.125𝑚𝑚
254mm
300mm
Left
Right
0.130mm
![Page 9: Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No. Boundary dinm (Þd x x T) apered roller bearings - 2011JR mm Single-row - Metric series](https://reader035.fdocuments.us/reader035/viewer/2022062509/610588e70f244e662237afdf/html5/thumbnails/9.jpg)
![Page 10: Induced Axial Load...Axial Load (kN) G) 0001706 11 0005165 4323 Bearing type / series Bearing No. Boundary dinm (Þd x x T) apered roller bearings - 2011JR mm Single-row - Metric series](https://reader035.fdocuments.us/reader035/viewer/2022062509/610588e70f244e662237afdf/html5/thumbnails/10.jpg)
130µm
50µm
90µm
180µm
200µm
Optimized preload for life at this condition