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链传动兼有齿轮传动与带传动的优点,既具有恒定的平均传动比,又具有柔性啮合的特点。链轮是链传动的重要基础件。国际标准ISO606-1982规定:链轮的齿形可在一定范围内变动。但是,我国旧国家标准GB1244-76规定滚子链链轮的齿形是三圆弧一直线齿形,见图1。这是沿用原苏联标准而来。用这种齿形设计出来的链轮滚刀,在制造时不能铲磨,因而刀刃表面粗糙,切齿时滚削力大,刀具耐用度低。作者参加制订的新链轮国家标准GB1244-85,就不再规定三圆弧一直线齿形作为滚子链链轮的标准齿形,而规定一个最大齿槽齿形和一个最小齿槽齿形,允许加工出来的链轮齿形在此范围内变动。这就允许
Chain drive with both gear and belt drive advantages, both with a constant average transmission ratio, but also has the characteristics of flexible engagement. Sprocket is an important basis for chain drive. International Standard ISO606-1982 states: sprocket tooth profile can be varied within a certain range. However, the old national standard of our country GB1244-76 provides that the profile of the roller chain sprocket is a straight line with three circular arcs, as shown in FIG. 1. This is from the original Soviet standards. Sprocket hobs designed with this toothed profile can not be shovel-milled during manufacture, resulting in a rough cutting edge, large cutting forces during cutting, and low tool durability. The author participated in the development of the new sprocket national standard GB1244-85, it no longer provides three arc-line profile as a straight chain roller sprocket standard tooth profile, and provides a maximum tooth profile and a minimum tooth profile , To allow the processing of sprocket toothing within this range. This allows