Mechanical Engineering-Tribology In Machine Design Episode 2 potx
Mechanical Engineering-Tribology In Machine Design Episode 1 pdf
... design 1. 2 .1. Plain sliding bearings 1. 2.2. Rolling contact bearings 1. 2.3. Piston, piston rings and cylinder liners 1. 2.4. Cam and cam followers 1. 2.5. Friction drives 1. 2.6. Involute ... wear in higher kinematic pairs Introduction Loads acting on contact area 10 Tribology in machine design 1. 2.5. Friction drives Friction drives, which are being used increasingly in infinitely ... 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...
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Mechanical Engineering-Tribology In Machine Design Episode 2 potx
... 2 tan0 simplified Vabr =- - 71 H WL, Figure 2. 8 P E w3I2 refined Vabr =n2 ~2 ~3 12 L9 Ic 30 Tribology in machine design where k=h - 2BmR. If 1, is known, then In ... 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 ... Tribology in machine design 2. 2. Contact between bodies in relative motion A,= axb (nominal contact areal A,= FA; (real contact areal Figure 2. 1 from complex interactions between contacting...
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Mechanical Engineering-Tribology In Machine Design Episode 3 pdf
... 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 given in an !:I ... 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 consideration,...
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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 friction heating ... core; 5. smoother surfaces, free of fine cracks, by polishing, by careful running -in or by avoidance of coarse machining and grinding and of nicks in handling; 6. oil of higher viscosity and...
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Mechanical Engineering-Tribology In Machine Design Episode 5 pps
... lubrication and wear in lower kinematic pairs 1 05 the fact that when r>+ the machine will not sustain the load when the effort is removed. Thus, referring to the inclined plane, Fig. 4.9, ... corresponding to the maximum efficiency given above and the mechanical advantage is reduced in the ratio 4. 75 : 0.9 = 5. 23 : 1. In general, the following is approximately true: a machine will ... $, = sec u and eliminating $, sin a - f sin2 a J(sec2 a + tan2 $,) efficiency = sina + fcos2 a,/(sec2 a + tan2 I),) 102 Tribology in machine design Figure 4.6 as...
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Mechanical Engineering-Tribology In Machine Design Episode 6 ppt
... = 2 267 Nm kinetic energy developed in machine shaft = +lo2 = 44 .6 x 31.4~ = 2 267 Nm thus total energy supplied during the period of clutch slip =energy dissipated + kinetic ... =2 267 + 2 267 =4534Nm. 1 1 6 Tribology in machine design and Q =pA = R, sin oc hence, torque transmitted = fpAr,, (4.45) where f is the coefficient of friction for driving ... be used either to bring a machine to a state of rest, or to maintain it in a state of uniform motion while still under the action of driving forces and couples. In engneering practice, the latter...
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Mechanical Engineering-Tribology In Machine Design Episode 7 ppt
... have from eqn (4.110) tab lZY sin O sin(b - O)dO -0. Again, expanding sin@ - O) and integrating 411,-sin4$ 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 combination ofthem. ... design i.e. sin @sin(P-@)d@=O. Expanding sin(P - @) and integrating, this equation becomes Hence ~5~16 and proceeding as follows 5 n/6 R = ikab[- cos Pcos 20 +sin P(20 - sin 20)] =$kab[-ices...
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Mechanical Engineering-Tribology In Machine Design Episode 8 ppsx
... 70.9 -83 .0 70.9-103 .8 27.7 6.57-20 .8 13 .84 14.7 - - - - - - - - - Density (kg/m3) 7 169-74 18 3405 3792 16 331 287 9 24 08 1771 -1910 2297-2 685 Hardness 217-269 87 8 7 9 2 86 -88 280 0 ... 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 ... Misalignment of machines, however, cannot usually be anticipated in the design of seals for general industrial use. Misalignment can be designed into either the mating ring, the primary ring or the...
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Mechanical Engineering-Tribology In Machine Design Episode 9 pot
... 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 principles involved. It ... Some manufacturers of rotating machinery have tried to design a single bearing which can be used for all (or almost all) of their machines in a relatively routine fashion. An example is the...
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Mechanical Engineering-Tribology In Machine Design Episode 10 docx
... 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 the rolling resistance ... speeds, uses either tin-aluminium or copper-lead lining materials in various compositions. With increasing requirements for high load carrying capacity in a multitude of operating conditions there...
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Mechanical Engineering-Tribology In Machine Design Episode 11 pot
... use in high-temperature rolling-element bearing lubrication. Primary use of bonded films and composites containing solid film lubricants occurs in plain bearings and bushing in the aerospace industry. ... following expression may be used to determine the thermal correction factor for line contacts In eqn (6.28) the thermal loading factor, Tl, is defined as 260 Tribology in machine design ... presence of a lubricant between the rolling bodies in a bearing leads to 250 Tribology in machine design during the rolling of the ball along the surface of the inner and outer races respectively,...
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Mechanical Engineering-Tribology In Machine Design Episode 12 pot
... out. In most cases pitting is initiated in the vicinity of the pitch line. At the pitch point there is only pure rolling while above and below it there is an increasing amount of sliding aiong ... in machine design transmitting power in the range of 100-500 kW at a pitch line velocity not exceeding 15 nl s- '. The usual procedure is to determine both a thermal rating and a mechanical ... low-running clearance when the bearing is fitted to a machine. However, it is important to bear in mind that running a bearing with no internal clearance at all can lead to thermal instability...
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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 bearing, ... direction during approach, reducing to zero at the pitch point where the direction of sliding changes, and increasing again as the contact progresses through the recess action. This is shown, in a...
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Tribology in Machine Design Episode 6 potx
... simultaneously, a couple tending to 144 Tribology in machine design Expanding sin(/? — 0) and integrating, this equation becomesand proceeding as followsSubstituting the numerical valuesFor ... integrals as in the preceding case 150 Tribology in machine design rotate the front axle about a vertical axis will be instantaneously produced,resulting in unsteady steering action. ... constricted passage it begins to turn itself inside out as indicated in Fig. 4 .63 .Owing to the contamination of engineering surfaces, the contact angles ofoil against synthetic rubber...
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Tribology in Machine Design Episode 7 potx
... be obtained by substituting rfor x and 17 1 = U2 =0 in eqn (4.2a) 172 Tribology in machine design 4.15.11. Lubric ati on of sealsThe initial assumptions used in analyses ... the fluctuating loads on cylindrical bearing films is moredifficult to analyse. Squeeze-film action is important in cushioning andmaintaining a film in linkage bearings such ... is the 178 Tribology in machine design equation. Equation (5 .7) transformed into the cylindrical coordinates iswhere the velocities of the two surfaces are R l and R2 in the...
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