TAILIEUCHUNG - Machine Design Databook Episode 3 part 2

Tham khảo tài liệu 'machine design databook episode 3 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | DESIGN OF BEARINGS AND TRIBOLOGY DESIGN OF BEARINGS AND TRIBOLOGY Particular Formula FIGURE 23-45 The rate of heat dissipated from a journal bearing. The difference in temperature Ar of the bearing and of the cooling medium can be found from the equation Hd 4 Ld _ . Customary Metric 23-80c where Hd in kcal s Ld in m2 AT in C values of k are as given inside parentheses under Eq. 23-80a for US customary system units and values of k for customary metric units also given under Eqs. 23-80a and 23-80b AT 18 2 K jiPv SI Metric 23-81 where P in N m2 kgf mm2 v in m s and AT in K C K X 106 for bearings of light construction located in still air X 106 for bearings of heavy construction and well ventilated X 106 for General Electric Company s well-ventilated bearing The difference between the bearing-wall temperature tb and the ambient temperature ta for three main types of lubrication by oil bath by an oil ring and by waste pack or drop feed BEARING CAP The bearing cap thickness Refer to Fig. 23-46 for tb ta f t tb Ị3Wa h t c V -Lơ 23-82 Downloaded from Digital Engineering Library @ McGraw-Hill Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any Use is subject to the Terms of Use as given at the website. DESIGN OF BEARINGS AND TRIBOLOGY CHAPTER TWENTY-THREE Particular Formula Temperature rise of wall above ambient tb - ta C FIGURE 23-46 Relation between oil film temperature and bearing wall temperature. The deflection of the cap y - 4 23-83 The thickness of cap from Eq. 23-71 h - 3 c y ELy 23-84 where the deflection should be limited to mm in EXTERNAL PRESSURIZED BEARING OR HYDROSTATIC BEARING JOURNAL BEARING Fig. 23-47 The pressure in the lower pool of quadrant 1 P1 K1Po 23-85a Fig. 23-47 where K ---------- ------1-------------- 1 41 po - 1 I1 T - n P 4 23-85b Downloaded from Digital Engineering Library @ McGraw-Hill .

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