rocker as long as the support distance does not B4-CH16-B Bevel-helical speed reduction gearbox B4

Flender/Flender Gear Units/Bevel-helical speed reduction gearbox B4

that the tool radius c0should be no larger than the mean cone distance of the wheel m2. If the tool radius is too small, the opposite effect occurs, and therefore the selected value should not be lower than 1.1 m2sin m2(cf. Sect. 3.4.4 ). Modied slot width in this case, the wheel member has constant slot width as with the Duplex taper, but the pinion member does not. Therefore, the Completing method can be used only for the wheel (see Tables 2.1 and 2. and the amount of tilt is somewhat arbitrary. Uniform depth if the height of the bevel gear tooth is constant along the face width, the face and root angles are of equal value and, except in the case of angular correction, both will be equal to the pitch angle. The tooth tip line then runs parallel to the tooth root line. Should the tooth tips become thinner than the limiting value at which full hardening or crack formation begins, tip chamfering is performed (see Fig.2.. dedendum angle modication may be provided in order to prevent the tool from colliding with journal bearing or with the shaft of the work piece (see Fig.2.. This involves rotation of the tooth tip and tooth root lines round the mean point of the gear (.. the design point), by an amount which generally should not exceed 5/C1. Unlike all other bevel gears, gears with angular corrections have constant tooth depth dened perpendicularly to the root cone rather than the pitch cone. Fig. 2.1 Tooth tip chamfering. 1 face width , 2 length of chamfer, 3 angle of chamfer2 2 Fundamentals of Bevel Gears 2.2.4.3 Longitudinal Tooth Form The various longitudinal tooth forms have been described in Sect. 2.1. The commonest forms today are the circular arc created with the single indexing method and the elongated epicycloid produced with the continuous indexing method. The rst is referred to as face milling (FM), the second as face hobbing (FH). 2.2.4.4 Hand of Spiral In order to dene the hand of spiral of bevel gear, one looks from the apex of the pitch