Mechanical Engineering-Tribology In Machine Design Episode 13 pps

... further increase in velocity. There is, however, one important difference in the lubrication mechanism operating in plain journal bearings and in gears. In the case of the journal bearings, ... bearing, 7 Rolling contact bearing, 7, 248 Rolling friction, 235, 248 Rolling of tyre, 155 Rope drive, 134 Run -in, 11 Screw jack, 105 Scuffing, 9, 1 1, 12, 278 Self-lubricating...

Ngày tải lên: 13/08/2014, 05:22

... $, = sec u and eliminating $, sin a - f sin2 a J(sec2 a + tan2 $,) efficiency = sina + fcos2 a,/(sec2 a + tan2 I),) 102 Tribology in machine design Figure 4.6 as the ... Tribology in machine design equivalent cylinder near a plane is adequate when pressure generation is considered, but care must be exercised in relating the force components on the o...

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 sl...

Ngày tải lên: 13/08/2014, 05:21

... the practising designer: ESDU-78026, Equilibrium temperatures in self-contained bearing assemblies; Part I - outline of method of estimation; 58 Tribology in machine design integrals ... making a shallow indentation probably with edge cracks. Sometimes the breaking out of material continues rapidly in a direction away from the arrowhead point of origin, increasi...

Ngày tải lên: 13/08/2014, 17:20

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

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

... defines the allowed ranges of certain parameters. In using this equation these parameters cannot be allowed to assume values for which the assumptions made in obtaining eqn (2.102) are invalid. ... Tribology in machine design equilibrium, are the basis of the theory of fluid-film lubrication or hydrodynamic lubrication. The solution of the indefinite integral (dp/dO)dO is gi...

Ngày tải lên: 13/08/2014, 05:21

... 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

... be used either to bring a machine to a state of rest, or to maintain it in a state of uniform motion while still under the action of driving forces and couples. In engneering practice, the latter ... =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 designed...

Ngày tải lên: 13/08/2014, 05:21

... have from eqn (4.110) tab lZY sin O sin(b - O)dO -0. Again, expanding sin@ - O) and integrating 411,-sin4$ tanP= 1 - cos 4* 146 Tribology in machine design F =the maximum possible ... from the line of action of R, and the above equations become 156 Tribology in machine design ;T can be distinguished; free rolling, braking, accelerating, cornering or any comb...

Ngày tải lên: 13/08/2014, 05:21