Mechanical Engineering-Tribology In Machine Design Episode 4 pptx
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...
Mechanical Engineering-Tribology In Machine Design Episode 1 pdf
... 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...
Mechanical Engineering-Tribology In Machine Design Episode 2 potx
...
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...
Mechanical Engineering-Tribology In Machine Design Episode 3 pdf
... 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...
Mechanical Engineering-Tribology In Machine Design Episode 5 pps
...
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...
Mechanical Engineering-Tribology In Machine Design Episode 6 ppt
...
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...
Mechanical Engineering-Tribology In Machine Design Episode 7 ppt
...
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...
Mechanical Engineering-Tribology In Machine Design Episode 8 ppsx
... 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...
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 princ...
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 th...