The essentials of gearing; a text book for students and for self-instruction, containing numerous problems and practical formulas . Fig. VIII. X. Flexible Connectors. If pulleys be substituted for the revolving arms of the linkmechanism in Fig. V, and if a flexible connector such as a belt, rope, or chain be used to re-place the link, the velocity ratio may be maintained constant. And if the ratio of the pulley diameters be that of —- or —, the velocity ratio will be the same as that of the link mecha-FC AF XYUl INTRODUCTION. nism. Figure IX illustrates this case. FG is the fixed link, FC and
The essentials of gearing; a text book for students and for self-instruction, containing numerous problems and practical formulas . Fig. VIII. X. Flexible Connectors. If pulleys be substituted for the revolving arms of the linkmechanism in Fig. V, and if a flexible connector such as a belt, rope, or chain be used to re-place the link, the velocity ratio may be maintained constant. And if the ratio of the pulley diameters be that of —- or —, the velocity ratio will be the same as that of the link mecha-FC AF XYUl INTRODUCTION. nism. Figure IX illustrates this case. FG is the fixed link, FC and GN (the radii at the point ortangency with the flexible link) are the rotating arras, and CN the connector link. If 1 be thedriver, the driving side of the belt, or flexible connector, will be CN, but in other respectsthe action of this mechanism, for the instant, does not differ from that of Fig. V and Fig. X illustrates a case analogous to that represented by Fig. VI and Fig. VIII C STRIVING ^. Tig. IX. XI. Similarity between the Three Modes of Transmission. Figure XI illustrates a combina-tion of Figs. V, VII, and IX. It will be observed that the center line of link EK, the normalcomponent BW, and the line of the belt CN all coincide, and that the common normal, or lineof action, intersects the line of centers AG in the point A, thus determining the common ve- locity ratio, — = —&)„ AF Only one of these, the pulleys, will surely maintain a constant velocity ratio, although the direct contact mechanism may be made to do this by so shaping thecontact curves that their common normals will continue to pass tlirough point A. INTRODUCTION. XIX
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