Calculation method for convex corner length of hob cutter for dual-contact gear
A technology of gear hob and calculation method, which is applied in complex mathematical operations, measuring devices, instruments, etc., to achieve the effects of simple calculation, solving the interference between transition curve and involute, and high precision
Active Publication Date: 2018-02-16
ZHUZHOU GEAR CO LTD
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Problems solved by technology
Cylindrical gears with pure involute tooth surfaces do not have high requirements on the accuracy of the transition curve of the tooth profile; while double-contact gears are gears with two-position meshing with involutes and transition curves on the tooth surface, the fatigue strength of the tooth surface and Good bending strength, low noise during meshing, high gear strength and long service life, but the tooth surface composed of involute and transition curve, there is interference between transition curve and involute when the gear rotates and meshes, so the double contact High demands are placed on the accuracy of the tooth transition curve
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[0039] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered by the claims.
[0040] see Figure 1 to Figure 3 , a method for calculating the lobe length of a double-contact gear hob, including the following steps:
[0041] S1. Determination of the original tooth shape of the hob cutter: the designer obtains the relevant parameters of the original tooth shape based on experience and the requirements of the double-contact gear to be processed: the fillet radius R1 of the original lobe arc line MQ, the original tooth profile line MS The end face pressure angle α and the cutter tooth thickness Ss; and draw the original tooth shape according to the above relevant parameters of the original tooth shape, the original lobe arc line MQ is tangent to the original tooth profile line MS at point M, and the original lobe circle The center poin...
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The invention discloses a calculation method for a convex corner length of a hob cutter for a dual-contact gear. The method comprises the following steps of determining an original tooth shape of a hob cutter tooth, obtaining related parameters of the original tooth shape according to the requirements of the to-be-machined dual-contact gear, and drawing the original tooth shape according to the related parameters of the original tooth shape; determining a tooth shape of the hob cutter tooth after being moved out, moving out an original convex corner arc line outwards horizontally for displacement T to obtain a moved-out convex corner arc line, and enabling a moved-out convex corner tilting tangent line to be intersected with an original tooth-shaped line and tangential to an extended lineof the moved-out convex corner arc line, wherein an included angle is formed between the moved-out convex corner tilting tangent line and a vertical direction; and calculating out the moved-out convexcorner length. By adopting the calculation method for the convex corner length of the hob cutter for the dual-contact gear, the convex corner length of the hob cutter tooth can be quickly obtained; the method is simple and convenient in calculation, high in precision and favorable for reasonable design and selection and use of the gear hob cutter; and the problem of transition curve and involuteinterference in transmission engagement of the dual-contact gear is effectively solved.
Description
technical field [0001] The invention relates to a calculation method for the hobbing tooth profile of a lobe-type hob, in particular to a calculation method for the lobe length of a special hob for double-contact gears. Background technique [0002] The traditional cylindrical gear is a pure involute meshing. This pure involute cylindrical gear has a simple structure and is easy to process, and has been widely used in mechanical transmission. Cylindrical gears with pure involute tooth surfaces do not have high requirements on the accuracy of the transition curve of the tooth profile; while double-contact gears are gears with two-position meshing with involutes and transition curves on the tooth surface, the fatigue strength of the tooth surface and Good bending strength, low noise during meshing, high gear strength and long service life, but the tooth surface composed of involute and transition curve, there is interference between transition curve and involute when the gear ...
Claims
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IPC IPC(8): G06F17/15G01B21/02
CPCG01B21/02G06F17/15
Inventor 文贵华
Owner ZHUZHOU GEAR CO LTD