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轮冠距H是指锥齿轮的定位面至轮冠(锥齿轮的轴向削面内顶锥与背锥的交点即理论外径尖点)间的距离。轮冠距极限偏差是锥齿轮齿坯在加工过程中控制的重要项目之一。轮冠距是测量齿厚时控制锥齿轮副啮合侧隙的一个间接测量基准。在轮冠距片合格的情况下,方可以外径d_(?)作为测量基准控制弦齿高h_(?)和弦齿厚s,因为这时节锥相对轴向定位面的正确位置才能得到保证,锥齿轮副啮合时必要的侧隙也才能得到控制。一般轮冠距的上限偏差应取为0,以保证设计中所确定的顶隙。基于此,国标GB11365—89“锥齿轮和准双曲面齿轮精度”附录B“齿坯公差及接触斑点(参考件)”中对轮冠距的极限偏差推荐值:当中点法向模数为≤1.2mm、>1.2～10mm和>10mm时,轮冠距极限偏差分别为_(-50)~0μm、_(-75)~0μm和_(-100)~0μm。
Crown H refers to the wheel from the positioning surface of the bevel gear to the crown (the bevel gear within the axial cut surface cone and the back cone of the theoretical point that the outer diameter of the cusp point) distance. Wheel crown distance limit deviation is one of the important items in the process of bevel gear tooth blank control. The crown of the wheel is an indirect measure of the meshing flank of the control bevel gear when measuring tooth thickness. In the case of the wheel crowning film pass, the outside diameter d_ (?) Can be used as the measurement reference to control the chord height h_ (?) And the chord tooth thickness s because the correct position of the taper relative to the axial locating surface can be ensured. Bevel gear meshing necessary backlash can be controlled. General wheel cap pitch deviation should be taken as 0, in order to ensure that the design of the head space. Based on this, the national standard GB11365-89 “bevel gear and hypoid gear precision” Appendix B “tooth blank tolerance and contact spots (reference)” on the wheel crown distance limit deviation Recommended value: When the midpoint of the normal modulus is ≤ 1.2mm,> 1.2 ~ 10mm and> 10mm, the maximum allowable deviation of the crown of the wheel was from (- 50) ~ 0μm, _ (- 75) ~ 0μm and _ (-100) ~ 0μm, respectively.