Gear Skiving Tool Geometry for Simultaneous Cutting Edge Engagement

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional gear skiving tools experience deflection effects due to abrupt force changes, leading to local thickening and reduced dimensional accuracy of machined gears.

Innovation Solution

A gear skiving tool design where the left and right cutting edges of each cutting tooth run on different spherical surfaces or in different planes, allowing simultaneous engagement or disengagement, thereby reducing force fluctuations and improving machining precision.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional skiving tools with cutting edges engaging one after the other are used, then the machining process is simple, but force changes are abrupt causing deflection effects and local thickening on tooth flanks

Engineering Contradiction:

Improvedimensional accuracy of tooth flanksVSAvoidcomplexity of cutting edge geometry

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies asymmetry by designing the left and right cutting edges to run on different spherical surfaces or in different planes, creating an asymmetric configuration that enables simultaneous engagement. This asymmetric design allows both cutting edges to engage the opposing tooth flanks at the same time, eliminating the sequential engagement of conventional symmetric tools and thereby preventing abrupt force changes and deflection effects.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent employs spheroidality by defining the cutting edges as running on spherical surfaces rather than flat planes. This curved geometry allows the cutting edges to be positioned such that they simultaneously engage the tooth flanks during machining. The spherical surface configuration enables the precise spatial arrangement needed for simultaneous engagement while maintaining the structural integrity of the cutting tool.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Manufacturing precision

If cutting edges engage sequentially as in conventional tools, then the tool structure is simpler, but deflection effects occur due to finite stiffness of the system

Engineering Contradiction:

Improvedimensional accuracyVSAvoidstiffness of cutting tool system

Core Design Contradiction:

Manufacturing precisionVSStrength

Solution Approach 1:

The patent applies the counterweight principle by having the left and right cutting edges simultaneously engage opposing tooth flanks with equal and opposite forces. This balanced force distribution counteracts the deflection effects that would otherwise occur due to the finite stiffness of the workpiece, tool, and machine system. The simultaneous engagement creates a force equilibrium that prevents the abrupt force changes and resulting deflections seen in sequential engagement systems.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

3Manufacturing precision

If simultaneous engagement of cutting edges is achieved, then dimensional accuracy improves, but the tool geometry becomes more complex

Engineering Contradiction:

Improveaccuracy of tooth flank machiningVSAvoidmanufacturability of skiving tool

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentEP4566745A1Skiving tool and skiving method with simultaneous intervention start or intervention of two cutting edges

Publication Date: 2025.06.11 REISHAUER AG

Figure 1~2
Figure 3~4
Figure 5~6

AI summary

The invention relates to the skiving of gear teeth. During the machining of tooth flanks of the gear teeth, pairs of oppositely oriented cutting edges of a skiving tool simultaneously come into contact with and/or out of contact with two oppositely oriented tooth flanks of the gear teeth. This reduces deflection effects and resulting machining inaccuracies. The two cutting edges of such a pair of cutting edges are defined by different generating geometries. In particular, the two cutting edges of a pair of cutting edges on the skiving tool do not run in the same plane or on the same spherical surface.