Design of Polydyne Cam for High Speed I.C. Engine

Authors

  • Prasad N.B.V Asst. Professor, ME Dept., K.L. College of Engineering, Vijayawada, AP, India
  • Venkata Chalapathi2 P Asst. Professor, IPE Dept., K.L. College of Engineering, Vijayawada, AP, India

Keywords:

Polydyne cam, displacement, velocity, acceleration of cam, profile, dynamic behaviour, under cutting, jump of follower

Abstract

Cams play very important role in the I.C. engine valve gear mechanisms. Dynamic behaviour of cams for high speed engine causes cross over shock, jump, follower spring surge etc.  A proper selection of suitable polydyne cam will reduce these adverse effects, to a large extent.  In this paper, an attempt has been made to suggest a best suited cam profile for the valve gear mechanism of the existing high speed IC engine.  A mathematical model of the cam is generated.  A source code is developed in C language, to compute the displacement, velocity and acceleration of the cam follower.  The methodology adopted tests the suitability of the polynomial cam profile for a given engine specifications and suggests modifications.  The results are shown graphically and are also compared with the existing cam profile.

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References

Duadley W H, “New method in cam design” SAE Trans, vol-2, No.1, Jan 1948, pp.19-33.

Thoern T R, Engermann H H and Studdart D A, “Cam design as related to valve gear dynamics” SAE Q Trans, Jan 1952, vol-61, pp.1-14.

Barkan P, “Calculations of high speed valve motion with a flexible overhead linkage” SAE Trans, 1953, vol-61, pp.687-700.

Kanzaki K and Itao K, “Polydyne cam mechanisms for tye head positioning” ASME J. Engg. Industry, Feb 1972, vol-94, pp.250-254.

F Y Chen, “Analysis and design of cam-driven mechanisms with non-linearities” ASME J.Engg. Industry, Aug 1973, pp.685-693.

Rothbart H A, “Cams, designs, dynamics and accuracy” John Wiley & Sons, New York, 1958.

Fan Y Chen, “Mehcanics and design of cam mechanisms” Pergamon press.

Robert L Norton, “Design of machinery” Mc.Graw Hill Inc., 1972.

Siddeswar, Design data book

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Published

2008-03-01

Issue

Section

Articles

How to Cite

[1]
“Design of Polydyne Cam for High Speed I.C. Engine”, JME, vol. 3, no. 1, pp. 33–37, Mar. 2008, Accessed: Oct. 04, 2024. [Online]. Available: https://smenec.org/index.php/1/article/view/656

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