sizing of ball bearing arrangement Data Pump rotation piston translation Objective design the revolute joint Constraints Use ball bearings To do Check bearings ID: 1044597
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1. Pump designDesign and sizing of ball bearing arrangement
2. DataPump: rotation piston translationObjective: design the revolute jointConstraints:Use ball bearingsTo do:Check bearings validationDesign bearing arrangementDesign shaft and housingDesign sealing
3. Pump designBearings validation3
4. Loads estimation4Parametrizationa = 60 mmb = 20 mmd = 100 mme = 12 mm baedBHC A eCH
5. Loads estimation: Static equilibrium on the shaft5External loads on the shaft:Entry torque: and Piston: at H: Bearing A: at A: Bearing B: at B: Calculate torques at the same point B:
6. Loads estimation: Static equilibrium on the shaft6Equilibrium:Forces: Torques: Values: for maximal pressure
7. Loads estimation7On bearing A: Axial load: Radial load: On bearing B: Axial load: Radial load:
8. Bearing sizing8Static criterion: ABReference6003 17/35/106005 25/47/123.25 kN6.55 kN1 (normal)1 (normal)Validated ?☺☺ABReference6003 17/35/106005 25/47/123.25 kN6.55 kN1 (normal)1 (normal)Validated ?☺☺Ball bearings
9. Bearing sizing: rating life9Dynamic criterion: Ball bearings n = 3Calculate P:If Fa/Fr > e : P = X Fr + Y FaIf Fa/Fr e : P = Fr ABReference6003 17/35/106005 25/47/126.37 kN11.9 kN0 N0 N942 N2355 N309 Mr129 Mr??ABReference6003 17/35/106005 25/47/126.37 kN11.9 kN0 N0 N942 N2355 N309 Mr129 Mr??
10. Bearing sizing: rating life10To estimate L10h, need rotation speed.Data: flow: Qv = 4.5 L/minRotation speed in rad/s: Speed of point M: Vertical speed of point M:
11. Bearing sizing: rating life11Average flow:
12. Bearing sizing: rating life12Value: Qv = 4.5 L/min = 4.5/60 106 mm3/s = 7.5e4 mm3/s
13. Bearing sizing: rating life13 ABReference6003 17/35/106005 25/47/126.37 kN11.9 kN0 N0 N942 N2355 N309 Mr129 Mr597 r/min597 r/min8773 h3663 hABReference6003 17/35/106005 25/47/126.37 kN11.9 kN0 N0 N942 N2355 N309 Mr129 Mr597 r/min597 r/min8773 h3663 h
14. Pump designDesign of the bearing arrangement, shaft and housing14
15. ABCHØD1mini = 10,5 mmØD2mini = 12,8 mm20 mm20 mm12 mmGeneral designGeometrical data on bearings position, bearings size and shaft dimensions
16. General design16From PyVot software
17. Bearing arrangement17Which rings should be in interference fit ?External load on the shaft: fix direction with respect to the housingShaft rotates in the housing Inner rings in interference fit on the shaft
18. Bearing arrangement18Interference fitted rings are preferably located by shouldersImagine how the arrangement is mounted to desing the shoulders
19. Snap ringBearing arrangement192 additional locating elements 4 elements on the 2 inner rings
20. Bearing arrangement20Outer rings: A: free ; B: located
21. Bearing arrangement21Axial loads can be transmitted in both directions.
22. Bearing arrangement: other option22SpacerLock nut
23. Bearing arrangement: sealing23
24. Bearing arrangement: sealing (example)24CoverRadial seal
25. Shaft design25Find a solution for the excentrical part and the roller
26. Shaft design26Find a solution for the excentrical part and the roller
27. Housing design: functionnal surfaces27
28. Housing design28Moulded housing design rulesMain rule: same thickness everywhereDesign holes for fixation on the other semi-housingMake the housing rigid enough
29. Housing design29
30. Housing design30