Page 514 - Cam Design Handbook

THB14 9/19/03 7:59 PM Page 502

502 CAM DESIGN HANDBOOK

From Eq. (14.32)

.
45 5
K = = 091
.
i
-
6010
and
30
K = = 015..
0
-
200 0
From Eq. (14.34)
3
r = 015 d .
0
.
1+ 10e 6t m (t m + 470)
.
091 dt
m
Differentiating,
3
r = .
0 È 2820 ˘
+ .
11 65 Í 2 ˙ e 6t m (t m + 470)
( Î t m + 470) ˚
Also we know
r = c - r 0
i
e
3
=- r 0 in.
From Eq. (14.31)
.
q = KR = 091 deg
t
i
m
i
()
q = KS = Kg R =15 e 6 t m ( t m +470 ) .
.
0 0 0
These equations give the information necessary for the cam construction. It is necessary
to substitute values of temperature t m to determine the corresponding radii r and cam
angles q. It is conventional to use a tabular notation.
REFERENCES
Cheng, C.Y., and Lin, Y.Y., “Improving Dynamic Performance of the Geneva Mechanism Using Non-
linear Spring,” Mech. Mach. Theory 30 (1): 119–29, 1995.
Dresner, T.L., and Barkan, P., A Review and Classification of Variable Vale Timing Mechanisms, SAE
Paper No. 890674, SAE Transactions. Vol. 98, Sec. 3, Journal of Engines, 1278–89, 1989.
Erdman, A.G., and Sandor, G.N., Mechanism Design, Vol. 1, third edition, Prentice Hall, Upper Saddle
River, N.J., 1984.
Fenton, R.G., Zang, Y., and Ku, J., “Development of a New Geneva Mechanism with Improved Kine-
matic Performance,” J. Mech. Design 116 (2): 369–74, 1994.
Freudenstein, F., and Sandor, G.N., Kinematics of Mechanisms in Mechanical Design Handbook, Sec.
3, H. Rothbart, Ed., McGraw-Hill Book Company, New York, 1986.