A new type of cylindrical worm-gear drive is presented. The worm is ground by a grinding wheel whose profile consists of two circular arcs, and the obtained worm profile is concave. The teeth of the gear are processed by a hob whose generator surface is identical to the worm surface. The aim of this paper is to introduce this new type of worm gearing and to compare the operating characteristics of the new type and of the commonly used worm-gear drives on the basis of tooth contact analysis, load distribution calculation, and thermal elastohydrodynamic lubrication analyses. The results obtained show the advantages of the new type of worm gear. The results of the load distribution calculation and EHD lubrication analysis are also used for the optimization of the design parameters of the new type of worm-gear drive.
Issue Section:
Power Transmission and Gearing
1.
An, Z., and Jia, B., 1988, “An Investigation of Concave-Convex Profile of a Cylindrical Worm Drive,” Proceedings, International Conference on Gearing, Zhengzhou, pp. 167–173.
2.
Bathgate
J.
Jates
F.
1970
, “The Application of Film Thickness, Flash Temperature and Surface Fatigue Criteria to Worm Gears
,” ASLE Transactions
, Vol. 13
, pp. 21
–28
.3.
Dong, M., and Wang, S., 1995, “The Meshing Theory of Cone-Generated Envelope Cylindrical Worm Drive with Two Degree-of-Freedom,” Proceedings, Ninth World Congress on the Theory of Machines and Mechanisms, Milano, pp. 605–609.
4.
Duda´s, I., and Ba´nyai, K., 1997, “Simulational Analysis of the Effects of Productional Errors in Case of Worm Driving Pairs,” Proceedings, MTM’97 International Conference on Mechanical Transmissions and Mechanisms, Tianjin, pp. 620–624.
5.
Gao, Y., and Xu, X., 1988, “The Controllable Curvature Modification Theory for Point Contact Niemann’s Worm Gear Drive,” Proceedings, International Conference on Gearing, Zhengzhou, pp. 147–150.
6.
Greening, J. H., Barlow, R. J., and Loveless, W. G., 1980, “Load Sharing on the Teeth of Double Enveloping Worm Gear,” II International Power Transmission and Gearing Conference, San Francisco, Paper No. 80-C2/DET-43.
7.
He, H., and Wei, Y., 1997, “Analysis of Elastohydrodynamic Lubrication of Plane Re-Enveloping Hourglass Worm Gearing,” Proceedings, MTM’97 International Conference on Mechanical Transmissions and Mechanisms, Tianjin, pp. 660–663.
8.
Hiltcher, Y., Guingand, M., and Octrue, M., 1994, “Computed Contact Surface Topology of Worm Gear—New Approach and Cutting Parameters Influences,” Proceedings, International Gearing Conference, Newcastle upon Tyne, pp. 501–506.
9.
Hlebanja, J., and Vi intin, J., 1980, “An Investigation and Testing of a Con-cavo-Convex Profile for the Basic Profile of a Cylindrical Worm,” II International Power Transmission and Gearing Conference, San Francisco, paper No. 80-C2/DET-14.
10.
Ho¨hn, B. R., Neupert, K., and Steingro¨ver, K., 1996, “Wear Load Capacity and Efficiency of Worm Gears,” Proceedings, International Conference on Gears, Dresden, pp. 409–425.
11.
Jiao, J., Cheng, F., Zhang, Z., and Liu, S., 1997, “Analysis of Worm Wheel Tooth Surface Equations in Cylindrical Worm Drive with Circular Arc Profile,” Proceedings, MTM’97 International Conference on Mechanical Transmissions and Mechanisms, Tianjin, pp. 742–744.
12.
Kubo, A., 1981, “Estimation of Gear Performance,” Proceedings, International Symposium on Gearing and Power Transmissions, Tokyo, Vol. II, pp. 201–206.
13.
Litvin
F. L.
Kin
V.
Zhang
Y.
1990
, “Limitations of Conjugate Gear Tooth Surfaces
,” ASME JOURNAL OF MECHANICAL DESIGN
, Vol. 112
, pp. 231
–236
.14.
Litvin, F. L., 1994, Gear Geometry and Applied Theory, P T R Prentice Hall, New Jersey.
15.
Seol, I. H., and Litvin, F. L., 1996, “Computerized Design, Generation and Simulation of Meshing and Contact of Modified Involute, Klingelnberg and Flender Type Worm-Gear Drives,” Proceedings, 7th International Power Transmission and Gearing Conference, San Diego, pp. 125–131.
16.
Shimokohbe, A., and Toyama, A., 1986, “Tooth Bearing and Angle Transmitting Accuracy of Worm Gears,” Proceedings, 2nd World Congress on Gearing, Paris, pp. 689–697.
17.
Simon
V.
1981
, “Elastohydrodynamic Lubrication of Hypoid Gears
,” ASME JOURNAL OF MECHANICAL DESIGN
, Vol. 103
, pp. 195
–203
.18.
Simon, V., 1985, “Thermoelastohydrodynamic Analysis of Lubrication of Worm Gears,” Proceedings, JSLE Tribology Conference, Tokyo, pp. 1147–1152.
19.
Simon
V.
1993
, “Load Distribution in Double Enveloping Worm Gears
,” ASME JOURNAL OF MECHANICAL DESIGN
, Vol. 115
, pp. 496
–501
.20.
Simon
V.
1994
, “A New Worm Gear Drive with Ground Double Are Profile
,” Mechanism and Machine Theory
, Vol. 29
, pp. 407
–414
.21.
Simon, V., 1995, “Tooth Contact Analysis of Mismatched Worm Gears,” Proceedings, Ninth World Congress on the Theory of Machines and Mechanisms, Milano, pp. 530–534.
22.
Simon
V.
1996
a, “Stress Analysis in Worm Gears with Ground Concave Worm Profile
,” Mechanism and Machine Theory
, Vol. 31
, pp. 1121
–1130
.23.
Simon
V.
1996
b, “Displacements in Worm Gears with Ground Concave Worm Profile
,” Mechanism and Machine Theory
, Vol. 31
, pp. 1131
–1140
.24.
Simon, V., 1997, “Load Distribution in Cylindrical Worm Gears,” Mechanism and Machine Theory, (submitted).
25.
Tan, J., Yamada, T., and Hattori, N., 1991, “Effects of Sliding/Rolling Contact on Worm Gear Lubrication,” Proceedings, JSME International Conference on Motion and Power Transmissions, Tokyo, pp. 1123–1127.
26.
Wang, S., and Zhang, H., 1991, “Research on the Controllable Modification of ZC Worm Drive,” Proceedings, Eighth World Congress on the Theory of Machines and Mechanisms, Prague, pp. 1359–1352.
27.
Winter
H.
Wilkesmann
H.
1981
, “Calculation of Cylindrical Worm Gear Drives of Different Tooth Profiles
,” ASME JOURNAL OF MECHANICAL DESIGN
, Vol. 103
, pp. 73
–82
.28.
Winter, H., Hohn, B. R., Michaelis, K., and Kagerer, E., 1991, “Measurement of Pressure, Temperature and Film Thickness in Disk and Gear Contacts,” Proceedings, JSME International Conference on Motion and Power Transmissions, Tokyo, pp. 1038–1042.
29.
Wu, H., and Wang, S., 1986, “An Investigation of the Cylindrical Worm Generated by a Double-Are Grinding Wheel,” Proceedings, 2nd World Congress on Gearing, Paris, pp. 759–767.
30.
Wu, H., and Huang, W., 1988, “Full Thermal EHD Analysis on the Cylindrical Worm Gearing with Double Circle Are Profile,” Proceedings, International Conference on Gearing, Zhengzhou, pp. 191–194.
31.
Yoshino, H., and Muta, Y., 1997, “Tooth Surface Modification Method Applicable to Various Types of Worm Gears,” Proceedings, MTM’97 International Conference on Mechanical Transmissions and Mechanisms, Tianjin, pp. 598–602.
This content is only available via PDF.
Copyright © 1998
by The American Society of Mechanical Engineers
You do not currently have access to this content.
