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机电工程英语
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PART ONE
Lesson 1 Machine Parts (I)
1.1 Text
Gears
[1]Gears are direct contact bodies，operating in pairs，that transmit motion and force from one
rotating shaft to another, or from a shaft to a slide (rack)，by means of successively engaging
projections called teeth．
Tooth profiles. The contacting surfaces of gear teeth must be aligned in such a way that the
drive is positive；i.e., the load transmitted must not depend on frictional contact．As shown in the
treatment of direct contact bodies，this requires that the common normal to the surfaces not to
pass through the pivotal axis of either the driver or the follower.
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发表于 2008-9-26 21:52:32
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