Journal bearing, Ball bearing

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Presentation transcript:

Journal bearing, Ball bearing Experiment 7 Journal bearing, Ball bearing

Journal bearing and Ball bearing

Lubrication oil Lb-sec/in2

Journal bearing

Revolutions per second Petroff equation viscosity Radius of bearing Friction force Revolutions per second Length of the bearing Radial clearance

Average pressure in the bearing Hydrodynamic theory of lubrication Sommerfeld number Average pressure in the bearing

Example 1 A shaft runs at 1800 rpm in a 2x2 in2 bearing at a stable temperature of 150oF. The oil used is SAE 20, the load is 2000 lb, and Cr =0.001in. Find friction force and hp. Sol. From Fig. 8.11(b), fr/Cr=3.6 from Fig.8.11(a) h0/Cr=0.44. therefore, h0=0.00044in.

Ball and roller contact bearing

Static and dynamic load

Note: The reliability for C10 is 0. 9 Note: The reliability for C10 is 0.9. a=3 for ball bearing, 10/3 for roller contact bearing

Combined Radial and thrust Loading

Example 2 A single roll deep groove ball bearing( d=22mm, D=44mm, B=12mm.) running at 700 rpm, the load is 10 kN and in radial direction. Find the life of the bearing. Sol. From the catalog the bearing has a dynamic rate load of 9.4kN.

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Experiment 7-1 Determine the power need to overcome the friction of the journal bearing for a optical disk spindle motor. The dimension of the bearing is 0.1 x 0.2 in., the clearance is 0.0002in. The lubrication oil is light turbine oil. The speed is 8000rpm. If the operating temperature is 140oF, find the power needed to overcome the friction of the bearing.

Experiment 2 If the break of a motorcycle has a bearing which loaded by a dynamic force. The required life of the break is 10000 hr, find the maximum design load of the bearing. Please Draw a figure (dimensions) of the assembly of the bearing (including the mounting arrangement).