Question

Problem 2: A pressure-fed bearing has a journal diameter of 50.00 mm. The length of the bearing is 55 mm with a 5 mm wide central annular groove. The bearing is fed by SAE 30 oil at 200 kPa supply gauge pressure. The journal speed is 2880 rev/min carrying a load of 10 kN. Use a minimum clearance of 0.042 mm and an average oil film temperature of 85°C to perform a design assessment using Trumpler's criteria.

Answer 1

Given dlata diameter d#50.00 mm กากา b50. 084 mm SAE 30 me o 5o.084 50 o.084 2 min o.04 2 mm diametey 0.042.

1'. : 155-5) (50) a5 50 O.5 lOxIO o.as Pつ4000 kpa Step -3 s- /595) 4000 1o) 0.684 4000 xe? 55)56x lo

room FIjuve 12-18 and 13-1s 6 3 (005) o) 97 8x 10 12.696 L-18 las &.08375 469 34 6 130.8 (t-6&50x1。4 AT: 760℃ 55t, 38 Tav - 93

Step choose - lo0c 2 13 .055x 538 Foom 4 + 1.58 6 -4415349 88-7 xG-06a:8NO8 av la68. 4

Tav 90 쿠0 Ilooc | 68,4%) Go 80 90 10o Ste.: choose Tom the pO (T:852 s-0.055 (b3) S -o. 0457 с. Fr 1+1.5x(0.875 acox (25)9 918189X 1.8672xlo T 58.6 c

6 ΔΙ 55 + 58.6 Resuttan T8589.3 S- 0.055/10.8 -0,055 x 0,830 0,045 ho l3 △7-978x10 98 x10 -455971096-7 x 1.30446 x10 6

2- 55 59.5 55ナ &9-75 a 84.75 C . 14 5814 x 1551. 6254 -3 5. 46 x lO hoo 00546 mm a5.9

max 18.7 These is no point i pooceeding puythey