Eccentric Threaded Excavator Tooth Attachment

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Solution Overview

Problem

Existing excavator tooth attachment systems are often complex, costly, inconvenient, and unsafe due to reliance on impact methods, and lack effective stabilization and wear reduction between teeth and adaptor noses.

Innovation Solution

A unique attachment system featuring a 'male' adaptor nose and 'female' tooth pocket with eccentric fastener threads and inclined interface surfaces, allowing secure, intuitive, and stable attachment using a fastener that can be easily installed and locked, reducing wear and facilitating convenient replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If impact methods (hammers) are used to install and remove attachment pins, then installation and removal can be achieved, but safety is compromised and operation becomes inconvenient

Engineering Contradiction:

Improveinstallation convenienceVSAvoidsafety hazards

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the manual impact-based mechanical system (hammers and pins) with a threaded fastening system that uses rotational motion instead of linear impact. The threaded孔 in the tooth and corresponding threaded rod in the adaptor nose allow for safe, tool-based installation and removal without requiring hammer strikes, thereby eliminating safety hazards while maintaining ease of operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If non-impact attachment systems are developed, then safety is improved, but device complexity and cost increase

Engineering Contradiction:

Improvesafety hazardsVSAvoidattachment system complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The attachment system is segmented into distinct, simple components: threaded holes in the tooth, threaded rods in the adaptor nose, and retaining rings. This segmentation allows each component to perform its specific function independently, avoiding the need for complex integrated mechanisms while maintaining safety. The simplicity of individual parts reduces overall system complexity and cost.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using complex non-impact mechanisms to replace simple impact methods, the patent inverts the approach by using a universally understood and simple threaded fastening system that is already common in industrial applications. This inversion of the problem-solving approach leads to a solution that is both safe and simple, avoiding unnecessary complexity.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If traditional attachment systems are used, then teeth can be attached to adaptor noses, but wear between tooth and adaptor nose increases

Engineering Contradiction:

Improveattachment reliabilityVSAvoidwear

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent incorporates retaining rings that engage with both the tooth and adaptor nose, creating a cushioning effect that distributes loads and reduces direct wear between the tooth and adaptor nose surfaces. The retaining rings act as intermediary elements that prevent direct metal-to-metal contact, thereby reducing wear and extending the service life of the attachment system.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Adaptability or versatility

If existing adaptor noses are retrofitted, then existing equipment can be upgraded, but the retrofit process becomes complex

Engineering Contradiction:

Improveretrofit capabilityVSAvoidretrofit complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The adaptor nose is designed with universal threaded holes that can accommodate various tooth configurations. The standardized threaded rod and retaining ring design allow the same adaptor nose to work with different tooth types, making the system versatile. This universality simplifies the retrofit process by eliminating the need for custom modifications for each tooth type, reducing retrofit complexity while maintaining adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP2494114B1Retrofitted excavator tooth attachment

Publication Date: 2020.09.09 BLACK CAT WEAR PARTS LTD

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AI summary

An excavator implement attachment system can include a tooth having a pocket formed therein, an insert received in a recess formed in an adaptor nose and a threaded fastener which releasably secures the tooth on the nose, the fastener having a helical thread formed thereon which is eccentric relative to a fastener body. A tooth can include a pocket with at least one side wall which has an insert-receiving recess and generally planar insert-engaging interface surfaces formed therein, with one interface surface resisting rotation of the tooth about a longitudinal axis in one direction, and another interface surface resisting rotation of the tooth about the longitudinal axis in an opposite direction. An excavator tooth can include a pocket bounded by opposing side walls, with at least one of the side walls having an insert-receiving recess internally formed thereon, whereby the recess receives an insert installed in an adaptor nose.