Design a journal bearing set that supports a radial load of

Design a journal bearing set that supports a radial load of 2000 Lbs. at a spinning speed of 1200 RPM. Your design should include the following parameters: Bearing Length Journal diameter or radius Radial clearance Recommended lubricant type Recommended lubricant inlet temperature Journal Line of centers or line joining 0 (centre of bearing) and 0 (centre of jouuma) With Without groove 9.7 AT 22.2. A T-

Solution

Given Data:

n = 1200 rpm = 20 rps;

F = 2000 lbs. = 8896.44 N;                                                     

Consider Journal diameter =100 mm

r = 0.5d= 60mm            

STEP1:

Unit load for journal bearing: select according to application

TABLE IS REQUIRED

Consider recommended unit load for typical application is 0.6 to 1.2 MPa.

STEP2: Select l/d ratio according to application

As I have selected centrifugal pump the l/d ratio= 0.75 is selected.

l=0.75d           

l=0.75 x 100= 75mm

STEP3:

P= f/ld= 8896.44/ (75 x 100)            =1.186 MPa

STEP4: V=

STEP5: Choosing cast bronze material for the bearing, the recommended clearance is coming under C curve of Fig below.

Recommended radial clearance for cast bronze bearings

STEP6: ho 0.005 + 0.00004 d =0.005 +0.00004x100= 0.009mm

All the relavant table for design parameter should be given , then only anyone can proceed further.