Lubrication Fundamentals 2011 Part 4 pps

... Vickers 104C Vane Pump Test Results with Mobil EAL 224H Vegetable-Based Oil Test hours Properties New oil 100 200 Viscosity, cSt at 40 ЊC (ASTM D 44 5-3) 35 .4 35.1 35.6 Total acid number (ASTM D 6 64) ... LC 50 (ppm) Shake flask CEC test Mineral oil 389 to Ͼ5000 42 48 (Not tested) Vegetable oil 633 to Ͼ5000 72–80 Ͼ90 Synthetic ester Ͼ5000 55– 84 Ͼ90 Polyglycol 80 to Ͼ5000 6–38 (Not test...

Ngày tải lên: 11/08/2014, 10:23

... light natural gas hydrocarbons with one to three carbon atoms About 80 40 0ЊF (27–2 04 C) for gasoline components 40 0–650ЊF (2 04 343 ЊC) for diesel and home heating oils Higher ranges for lubricating ... 212-685 -45 40 Eastern Hemisphere Distribution Marcel Dekker AG Hutgasse 4, Postfach 812, CH -40 01 Basel, Switzerland tel: 41 -61-261- 848 2; fax: 41 -61-261-8896 World Wide Web http:/...

Ngày tải lên: 11/08/2014, 10:23

... between 49 and 65ЊC (120– 149 ЊF) in conven- tional hydraulic systems. Some variable volume pump systems, closed-loop hydraulic sys- tems, and hydraulic transmissions can operate up to 120ЊC ( 248 ЊF), ... time. Thin film lubrication includes mixed film and boundary lubrication. 3. Solid films are more or less permanently bonded onto the moving surfaces. A. Fluid Films Fluid film lubric...

Ngày tải lên: 11/08/2014, 10:23

... With respect to lubrication and the forma- tion and maintenance of lubricating films, gears can be classified as follows: Spur (Figure 8 .44 ), bevel (Figure 8 .45 ), helical (Figure 8 .46 ), herringbone ... industry, particularly where stick–slip characteristics can contrib- ute to reduced precision of machined parts. 1. Grease Lubrication On some machine tools, grease is used for the l...

Ngày tải lên: 11/08/2014, 10:23

... engines present a variety of lubrication challenges, certain factors affecting lubrication are more or less common to all reciprocat- ing engines. The primary objectives of lubrication of reciprocating ... provide a more comprehensive description that includes all the factors that make a particular oil suitable for a particular type of engine service. F. Alkalinity Most detergents, and...

Ngày tải lên: 11/08/2014, 10:23

... (28.8–35.2 cSt at 40 ЊC). Some applications require somewhat higher viscosity oils, ISO viscosity grade 46 (41 .4 50.6 cSt at 40 ЊC) or ISO viscosity grade 68 (61.2– 74. 8 cSt at 40 ЊC). These grades ... provide satisfactory lubrication of the gears. Oils of ISO viscosity grade 68 (61.2– 74. 8 cSt at 40 ЊC) are used in many of these systems. Oils of viscosity grade 100 (90 –110 cSt at...

Ngày tải lên: 11/08/2014, 10:23

... 0. 24 10–12 225–350 1100–1500 1–2 0. 34 12–15 350–600 1500–2000 2–3 0 .48 15–18 600–1000 2000–2600 3 4 0.62 18– 24 1000–1800 2600–3600 4 5 0.86 24 30 1800–3000 3600 48 00 5–6 1.15 30–36 3000 45 00 48 00–6000 ... oil a Synthetic b Fluorocarbons CFC- 11, 12, 113, 1 14, 500, 502 Yes PAO, POE HCFC- 22, 123, 125, 40 8A(blend) Yes PAO, AB HFC- 134a, 143 a No POE, PAG, PVE Blends 40 4A, 4...

Ngày tải lên: 11/08/2014, 10:23

... [ 24] :  r = 1 2µ ∂p ∂r z(z − h) + ρrω 2 µ  hz 4 − z 2 2 + z 3 3h − z 4 12h 2  (4. 37) G c = ρrω 2 µ h 3 40 (4. 38) If G c = 0 is assumed in Eq. 4. 34, Reynolds’ equation ignoring the centrifugal force ... Reynolds’ equation gave a floating height of 47 nm, about 4% larger than 56 4 Fundamentals of Thrust Bearings µ ∂ 2  θ ∂z 2 = 1 r ∂p ∂θ (4. 28) ∂p ∂z = 0 (4. 29) where ...

Ngày tải lên: 11/08/2014, 08:21

... 75 Copyright © 1983 CRC Press LLC (47 ) (48 ) The following particular solution for x′and y′satisfies the right-hand sides of Equations 47 and 48 : (49 ) (50) where: Equations 49 and 50 give the forced vibration ... becomes simply The characteristic equation for s is (43 ) where solutions are (44 ) Referring to Equation 42 we see that our two natural frequencies are (45 ) which are...

Ngày tải lên: 05/08/2014, 09:20

... 0.0 041 in. Dynamicperformance— (Ω/ω = 1,unbalance excitation). Entering Figures 41 to 43 with ⑀′ o = 0.67 gives (C/W)K xx = 4. 9 from which K xx = 4. 9(W/C) = 4. 9(2500/0.005) = 2.5 × 10 6 lb/in. 44 8CRC ... attitude angle φ = 48 °. Volume II 43 7 FIGURE 26. Power loss for partial arc journal bearing. Copyright © 1983 CRC Press LLC 43 8 CRC Handbook of Lubrication FIGURE 27. Inle...

Ngày tải lên: 05/08/2014, 09:20