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Reply to comments on “Optimum clearance in journal bearings”
Wear, 32 (1975) 273 0 Eisevier Sequoia S.A., Lausanne - Printed in the Netherlands
273
Letter to the Editor
Reply to comments on “Optimum clearance in journal bearings” In answer to Mr Martin’s comments [ 1] on our paper [ 21, we are grateful to his pointing out that Prof. Blok had some 17 years earlier suggested the same approach to the problem of optimum clearances. In fact, Prof Blok’s diagram D-2, corresponds to the mathematics derivation in Section 5, except that he calculates it for the inverse of the diameter/len~h ratio D/L. what we have done, being unaware of Prof. Blok’s contribution, is fit a best curve to Sassenfeld and Walther’s data and from the fit derived the maximum value of /z,~. The conclusion that the best geometry of diameter/length ratio of 3 to 1 when referred to tolerances is suggested by Fig. 11, where a maximum to the graph is seen at D/L = 3. Although Mr Martin suggests later that in his Fig. 2 of discussions that no optimum can be found from Blok’s method, this optimum definitely appeared when using Cameron and Wood’s results in our calculations. We agree that the concept of an optimum clearance may sometimes be by-passed by designers who may choose bearing length as a design variable, but it is obvious that if bearing geometry is closely related to that of tolerances, then a much more reliable design can be drawn up. P. S. Chu 45, Monks Drive, London W3 OEB (Gt. Britain) 1 F. A. Martin, Wear, 30 (1974) 389. 2 P. S. Y. Chu and E. Kay, Wear, 27 (1974) Received November 19, 1974.
329.
273
Letter to the Editor
Reply to comments on “Optimum clearance in journal bearings” In answer to Mr Martin’s comments [ 1] on our paper [ 21, we are grateful to his pointing out that Prof. Blok had some 17 years earlier suggested the same approach to the problem of optimum clearances. In fact, Prof Blok’s diagram D-2, corresponds to the mathematics derivation in Section 5, except that he calculates it for the inverse of the diameter/len~h ratio D/L. what we have done, being unaware of Prof. Blok’s contribution, is fit a best curve to Sassenfeld and Walther’s data and from the fit derived the maximum value of /z,~. The conclusion that the best geometry of diameter/length ratio of 3 to 1 when referred to tolerances is suggested by Fig. 11, where a maximum to the graph is seen at D/L = 3. Although Mr Martin suggests later that in his Fig. 2 of discussions that no optimum can be found from Blok’s method, this optimum definitely appeared when using Cameron and Wood’s results in our calculations. We agree that the concept of an optimum clearance may sometimes be by-passed by designers who may choose bearing length as a design variable, but it is obvious that if bearing geometry is closely related to that of tolerances, then a much more reliable design can be drawn up. P. S. Chu 45, Monks Drive, London W3 OEB (Gt. Britain) 1 F. A. Martin, Wear, 30 (1974) 389. 2 P. S. Y. Chu and E. Kay, Wear, 27 (1974) Received November 19, 1974.
329.