Some Aspects of Valve Gear Design

Abstract

After introducing the fundamental formulae relating cam velocity and acceleration with physical sizes the author reviews the principal types of acceleration curve to be found in use in modern automotive engines. This is followed by short sections dealing with valve spring design, contact stresses, and the effects of valve train flexibility on high-speed operation. Finally, a brief discussion is made on the effect of tolerances on cam acceleration.

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References

Bishop

J. L. H.

1950–51 Proc. Auto. Div. Instn mech. Engrs, p. 150, ‘An Analytical Approach to Automobile Valve Gear Design’.

Dudley

W. M.

1948 Trans. Soc. automot. Engrs, N.Y., vol. 2, No. 1, p. 19, ‘New Methods in Valve Cam Design’.

Stoddart

D. A.

1953 Mach. Design, Nos. 1, 2, 3, pp. 121, 146, 149, ‘Polydyne Cam Design’.

Arnold

R. N.

1952 Proc. 8th int. Congr. on Theoretical and Applied Mechanics, Istanbul, p. 403, ‘The Limiting Speed of Operation of Simple Cam Systems’.

Oliver

G. R.

Mills

H. R.

1945 Instn Auto. Engrs, Rep. No. 1945/R/8.

Roark

R. J.

1943 ‘Formulae for Stress and Strain’, p. 227 (McGraw-Hill Book Co., New York and London).

Talbourdet

G. J.

1954 Amer. Soc. mech. Engrs, Paper No. 54-Lub-14.

Turkish

M. C.

1953 Trans. Soc. automot. Engrs, N.Y., vol. 61, pp. 706, 714, ‘Relationship of Valve-spring Design to Valve Gear Dynamics’.

Turkish

M. C.

1946 ‘Valve Gear Design’ (Eaton Manufacturing Co., Detroit).

10.

Johnson

R. C.

1955 Mach. Design, No. 29, p. 195.

11.

Johnson

R. C.

1957 Mach. Design, No. 3, p. 105.