Ellipsoidal ring gear hob

Abstract

The invention discloses an elliptical internal gear hob for processing large internal gears, which is characterized in that: the tooth shape of the toothed blade (4) is distributed in the direction of the normal line of the circumference, and is a part of an imaginary gear. The center of the pitch circle of the imaginary gear is not on the axis line of the ellipsoidal internal gear hob, and the ellipsoidal internal gear hob is in the shape of an ellipsoid, and the cutting edges of all toothed blades (4) on the circumference of the ellipsoidal internal gear hob are on the An ellipsoid helicoid. With this scheme, the ellipsoidal internal gear hob not only retains the advantages of high machining accuracy, long service life, and good versatility, but also solves the problem that the larger the modulus of the spherical hob, the larger the diameter of the hob, so that it is difficult to manufacture and use. All bring difficulty even can't make or use the problem.

Description

technical field

[0001] The invention relates to an internal gear processing tool, in particular to an elliptical internal gear hob. technical background

[0002] Gear shaping is currently the most commonly used method for machining internal gears based on the generating principle. At present, the maximum modulus of the gear shaper cutter that domestic tool factories can manufacture is 15, while the diameter of the internal gear processed by the largest gear shaper machine in domestic heavy machinery factories is 1.5m ~ 2m. Large internal gears that exceed the above range cannot be processed domestically and can only be imported. The gear hobbing machine is much larger and can process large gears with a length of 5 meters. As long as there is a high-precision, easy-to-manufacture internal gear hob, the processing of high-precision and larger modulus internal gears can be realized. The research on internal gear hobs at home and abroad has a history of several decades, but th...

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