Bearing selection is a crucial step in the design of gear reduction system. You work for...

Transcribed Image Text:

Bearing selection is a crucial step in the design of gear reduction system. You work for a machinery design company and your role is to analyse and design the gear reduction system on a new line of farming equipment. Your manager asked you to select the appropriate cylindrical roller bearing that satisfies the load rating of the existing application, where the shaft design engineers calculated reactions on the right side of the shaft to be R, = 183.1 lbf and R, = -861.5 lbf. The gear reduction system shaft is designed to rotate at 1200 rev/min, with a desired bearing life of 15 kh at a 95 percent reliability in each bearing, assuming distribution data from manufacturer 2 in Table 11-6. Use an application factor of 1.2. (a) Obtain a Basic Dynamic Load Rating for a cylindrical roller bearing at the right end. (b) Use an online bearing catalogue of SKF and NSK to fill out the data sheet below for the indicated bearing types that satisfies the needed Basic Load Rating and the geometry requirements. Bearing type load Limiting speed Manufacturer designated Manufacturer Basic static rating serial number Cylindrical bearing, double row, full complement Cylindrical bearing, single row SKF roller SKF roller Single-row cylindrical bearings NSK roller Gear center Gear center 0.5 - 16 14 2.5 1.3 1,75 1.75 1.3 1.181 1.181 15 10 17 11 41 Figure.l: Gear reduction shaft (Dimensions in inches) Bearing selection is a crucial step in the design of gear reduction system. You work for a machinery design company and your role is to analyse and design the gear reduction system on a new line of farming equipment. Your manager asked you to select the appropriate cylindrical roller bearing that satisfies the load rating of the existing application, where the shaft design engineers calculated reactions on the right side of the shaft to be R, = 183.1 lbf and R, = -861.5 lbf. The gear reduction system shaft is designed to rotate at 1200 rev/min, with a desired bearing life of 15 kh at a 95 percent reliability in each bearing, assuming distribution data from manufacturer 2 in Table 11-6. Use an application factor of 1.2. (a) Obtain a Basic Dynamic Load Rating for a cylindrical roller bearing at the right end. (b) Use an online bearing catalogue of SKF and NSK to fill out the data sheet below for the indicated bearing types that satisfies the needed Basic Load Rating and the geometry requirements. Bearing type load Limiting speed Manufacturer designated Manufacturer Basic static rating serial number Cylindrical bearing, double row, full complement Cylindrical bearing, single row SKF roller SKF roller Single-row cylindrical bearings NSK roller Gear center Gear center 0.5 - 16 14 2.5 1.3 1,75 1.75 1.3 1.181 1.181 15 10 17 11 41 Figure.l: Gear reduction shaft (Dimensions in inches)