Mechanical Engineering-Tribology In Machine Design Episode 4 pptx

... continues rapidly in a direction away from the arrowhead point of origin, increasing in width and length. It is then called spalling. Spalling occurs more often in rolling-element bearings ... so-called inclusion-origin failure. Inclu- 80 Tribology in machine design 3.7.3. Refinement for thermal bulging in the conjunction zone Thermal bulging relates to the fact that fric...

Ngày tải lên: 13/08/2014, 05:21

... tribodesign into mechanical engineering and machine design, it is advantageous to start by visualizing Tribology in Machine Design 4 Tribology in machine design constantly upon the ultimate ... tribodesign is an obvious, and even indispensible, branch of machine design and, therefore, of mechanical engineering in general. In any attempt to integrate tribology...

Ngày tải lên: 13/08/2014, 05:21

... determined by examining the plasticity index, rl/. However, in the mixed lubrication regime in which A is in the range 1.0-3.0, where most machine sliding contacts or sliding/rolling contacts ... 36 Tribology in machine design generalized melting point based on the liquid/vapour critical point will be used Tm = 0.4Tc, where T, is the critical temperature. Taking i...

Ngày tải lên: 13/08/2014, 05:21

... lubrication Figure 2. 24 and the foregoing theory no longer applies. 42 Tribology in machine design Since the contact conforms rmax = (K W/A)($ + f 2 )4 Using A = n(~/2)~, In the case under ... error involved is of the order c/r, i.e. less than 0.1 per cent. Hence P =In pr sin @dB, (2. 144 ) 2 lt Mf =I qr2d0, (2. 145 ) where and The integrals arising fro...

Ngày tải lên: 13/08/2014, 05:21

... W- cos 24 cos 24& apos; Substituting these values of R, and R2 in eqn (4. 6) gives - sin4 x=- (acos4-bsin4) cos 24 = 3 tan 24( a - b tan 4) If a exceeds this value tilting will occur. ... advantage = - - cos(a + 41 + 43 ) cos 42 (4. 24) sin(a + 41 + 42 ) cos 4, ' Figure 4. 13 Equation (4. 24) is derived with the use of the law of sines. The eff...

Ngày tải lên: 13/08/2014, 05:21

... Figure 4. 40 braking torque, M = (T, - T2)a. (4. 102) 120 Tribology in machine design 4. 7.3. Power transmission rating 4. 8. Centrifugal - mechanism of operation Figure 4. 24 The ... =fin a loose bearing, = 1.57f in a new well-fitted bearing, = 1.275f in a well-worn bearing. 4. 9.1. Axially loaded bearings Figure 4. 28 shows a thrust block or pivot des...

Ngày tải lên: 13/08/2014, 05:21

... P we have from eqn (4. 110) tab lZY sin O sin(b - O)dO -0. Again, expanding sin@ - O) and integrating 41 1,-sin4$ tanP= 1 - cos 4* 146 Tribology in machine design F =the maximum ... eqns (4. 142 ) and (4. 143 ) and eliminating (F ,-F2) from eqn (4. 144 ), then Also, from eqns (4. 143 ) and (4. 144 ) and eliminating a This equation gves the least value of F, if...

Ngày tải lên: 13/08/2014, 05:21

... fluctuating loads on cylindrical bearing films is more difficult to analyse. Squeeze-film action is important in cushioning and maintaining a film in linkage bearings such as those joining the ... labyrinth seal. 4. 15.6. Wear in mechanical seals The sealing elements (the primary ring and the mating ring), of a nominally contact type seal, usually operate in uni-directional s...

Ngày tải lên: 13/08/2014, 05:21

... established in the following areas: (i) Machine tools. Use of gas lubrication in grinding spindles allows attainment of high speeds with minimal heat generation. 196 Tribology in machine design ... parameters, including length, which is useful in design and in plotting experimental results. It will be used here in the remaining derivations and discussion of the princ...

Ngày tải lên: 13/08/2014, 05:21

... expressed in consistent units. 5.9. Modern Thin-wall bearings, defined as lined inserts which, when assembled into a developments in journal housing conform to that housing, are commonly used in ... where bearings have been designed with a reduced 236 Tribology in machine design trailing wheels of a vehicle, however, rotate in bearings assumed to be frictionless and th...

Ngày tải lên: 13/08/2014, 05:21