Method of generation of face enveloping gears

Abstract

Face enveloping gears are machined by face milling type cutting tool or gear shaper. This process includes the following steps: positioning of the cutting tool in tangential relation relative to the meshing enveloping pinion thread with face gear by the smallest pitch diameter of threads with face gear teeth; turning rotating cutter relative to axis of rotation of an imaginary enveloping wheel until generating tooth is on the outer circle of the face gear. For generation of enveloping pinion the complementary cutting tool has additional motion around axis of pinion rotation. In another method tooth shaper or helical hob rotating tool rotates around axis of rotation of a theoretical generating gear for enveloping pinion with a predetermined relative motion to axis of rotation of work gear. This reduces production cost and makes manufacturing easier.

Description

FIELD OF THE INVENTION [0001] The present invention relates to production of an enveloping worm pinion face gears in the field of face, spiral or hypoid gears manufacturing. The enveloping worm pinion face gears are used to reduce or to increase speed or increase or reduce torque in helicopter or automobile gearboxes, turbine gearboxes, ship's transmission, and industrial applications. Certain applications may be outside of these fields, like power windows, doors or seats, power steering systems, chainless bicycle or motorcycle transmissions, and much more. BACKGROUND OF THE INVENTION [0002] A right angle gear transmission is well known for the transformation of motion and power between shafts where the axes of the pinion and the gear may be crossed or intersected. Recently two new types of enveloping pinion gear transmissions from my U.S. Pat. No. 6,148,683 and enveloping / globoid pinion face transmission from my patent application Ser. No. 10 / 435,143 made right angle gear transmiss...

AI Technical Summary

Benefits of technology

[0015] Simplified manufacturing of enveloping pinion machined by rotating cutter having generating elements rotating about respective cutter-head axis consisting in positioning the cutter in tangential relation relative to meshing of said enveloping worm thread having smallest pitch diameter with said face gear teeth and then turning of said rotating cutter relative to axis of theoretical generating gear for enveloping pinion and turning relative to the enveloping pinion around the axis of rotation of enveloping pinion until generating of a thread with the biggest pitch diameter. Relative turning to the enveloping pinion is faster in ratio between meshed face enveloping gears.

[0016] Above described manufacturing could be used for independent manufacturing of concave or convex surfaces of the enveloping pinion threads and face gear teeth or for simultaneous manufacturing of concave and convex thread surfaces or face gear teeth surfaces. Rotating tool can have cutting blades for machining or an abrasive surface for finishing. Using rotating tool like face milling or face hobbing allows for the use of very productive technology that was developed for standard spiral bevel and hypoid gears. The cost of production of enveloping face gears can be reduced.

Problems solved by technology

In existing enveloping worm and worm gear transmission it was not possible to use plunge feeding because gears became just index drives and were not efficient gears for transmission power.

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