Angled Stump Cutter Tooth Geometry Reduces Force Transfer

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Solution Overview

Problem

Existing stump cutter teeth are inefficient in cutting due to high force transfer and vibration, particularly in lightweight equipment and low horsepower machines, as they lack effective geometry for early relief during cutting.

Innovation Solution

A stump cutter tooth with an angled or tapered cutting face, featuring an arcuate tip subtending a central angle between 60 and 120 degrees, combined with straight edges providing relief angles between 10 and 20 degrees, which reduces the initial point of impact and allows for faster relief, thereby decreasing force transfer and increasing cutting efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a traditional elongated or circular tooth geometry is used, then the tooth structure is simple and easy to manufacture, but the cutting efficiency is low and high force is transferred back to the machine

Engineering Contradiction:

Improvecutting efficiencyVSAvoidforce transfer to machine

Core Design Contradiction:

ProductivityVSForce

Solution Approach 1:

The tooth geometry applies local quality by creating an angled or tapered cutting face at the tip region while maintaining a different geometry in the body portion. This localized angular feature at the cutting edge enables earlier relief during cutting, reducing force transfer to the machine while maintaining structural integrity in the body.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention changes the geometric parameters of the tooth by introducing an angle or taper to the cutting face, deviating from the traditional elongated or circular geometries. This parameter modification (adding angular orientation to the cutting face) enables faster relief during cutting action, improving cutting efficiency and reducing force transfer.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If a traditional tooth geometry without angled cutting face is used, then the tooth structure is simpler, but relief is achieved later in the cutting action reducing efficiency

Engineering Contradiction:

Improvecutting efficiencyVSAvoidtime to achieve relief

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The angled or tapered cutting face is localized to the tip region of the tooth, creating a specific geometric feature that enables earlier relief during cutting. This local angular feature allows the tooth to achieve relief faster compared to traditional geometries, improving cutting efficiency without requiring complex overall tooth structure.

Inventive Principle:

Principle #3Local quality

3Productivity

If an angled cutting face is introduced to improve cutting efficiency, then relief is achieved earlier, but the tooth geometry becomes more complex

Engineering Contradiction:

Improvecutting efficiencyVSAvoidtooth geometry complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The angled or tapered cutting face is applied locally only to the tip region of the tooth, while the body portion maintains a simpler geometry. This localized application minimizes the increase in overall geometric complexity while achieving the desired cutting efficiency improvement through the angular feature at the cutting edge.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10945385B2Stump cutter tooth

Publication Date: 2021.03.16 VERMEER MFG CO

AI summary

A stump cutter tooth with an angled or tapered cutting face, the purpose of the angle or taper being to increase the efficiency of the cutting tooth and lower the forces thereof that get transferred back to a stump cutter machine, the tooth also tapering to a full width required to protect a pocket or a mount from contact with a stump.