Gearwheel Undercut Machining with Localized Tooth Root Protuberances
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Solution Overview
Problem
Existing methods for producing gear teeth with undercuts using hob peeling face unfavorable cutting conditions near the tooth root, leading to weakened teeth and inefficient material removal.
Innovation Solution
The method involves producing protuberances that reduce tooth root thickness only over a portion of the tooth width, matching the extent of the undercuts, and using distinct hob peeling tools for toothing and protuberance production to optimize cutting edge contours and avoid material removal near the tooth head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If protuberances are produced over the entire width of the tooth to improve cutting conditions, then material removal efficiency improves, but the tooth is weakened
Solution Approach 1:
The patent applies local quality by producing protuberances only in specific regions where undercuts are needed, rather than across the entire tooth width. This localized approach improves cutting conditions precisely where required while preserving tooth strength in other regions. The protuberances are confined to overlapping regions between first and second portions of the tooth flanks, ensuring material removal efficiency is improved without unnecessary weakening of the entire tooth structure.
2Ease of manufacture
If traditional undercutting methods are used to produce undercuts in tooth flanks, then undercut formation is achieved, but cutting conditions near the tooth root become unfavorable
Solution Approach 1:
The patent applies preliminary action by first producing protuberances in the tooth flanks before forming the undercuts. These pre-formed protuberances create favorable cutting conditions by providing material removal pathways that facilitate subsequent undercut formation. The hob peeling tool first creates the protuberances in the first and second portions of the tooth flanks, which then serve as preparation for the undercutting process, improving overall cutting efficiency.
3Manufacturing precision
If hob peeling is used to produce toothing with undercuts, then precise gear tooth formation is achieved, but unfavorable cutting conditions occur in the region close to the tooth root
Solution Approach 1:
The patent applies local quality by creating protuberances specifically in the regions of the tooth flanks where undercuts will be formed, rather than uniformly across the entire tooth. This localized material removal creates favorable cutting conditions precisely in the problematic regions near the tooth root, while maintaining the precision of gear tooth formation in other areas. The hob peeling tool is configured to produce protuberances only in the overlapping regions between first and second portions of the tooth flanks.
Data Source
AI summary
A device and a method for the production of a gearwheel include a first step at which a toothing including teeth with tooth flanks is produced by hob peeling, a second step in which protuberances are produced in the region between a tooth root of the teeth and a root-shaped circle by a material-removing method, and a third step, at which undercuts are produced in the tooth flanks only in one or a plurality of first portions of the width of the toothing. In order to increase the stability of the teeth of the toothing, the protuberances extend only over second portions of the width of the tooth, each of which has an overlapping region with the first portion.