Working Machine Tooth With Stepped Cavity For Pin Load Distribution
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Solution Overview
Problem
Existing tooth designs for working machines like excavators and loaders face challenges in balancing penetration capability, strength, and material efficiency, with current couplings often leading to pin breakage or deformation, and complicating the removal of worn-out teeth.
Innovation Solution
A tooth design featuring a cavity with inclined inner walls and a stepped portion, allowing for secure attachment and easy removal via a pin, with contact surfaces distributed to reduce stress and material usage, and an adaptor nose portion that complements the tooth's geometry for enhanced strength and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the tooth is made longer and slimmer to improve penetration capability, then the penetration capacity is improved, but the strength and robustness of the tooth deteriorates
Solution Approach 1:
The tooth is designed with varying cross-sectional dimensions along its length, with the thicker section at the attachment end providing strength and the thinner tip providing penetration capability. This local variation in geometry allows the tooth to simultaneously achieve both strength and penetration performance.
Solution Approach 2:
The tooth utilizes a three-dimensional tapered geometry where the cross-section changes along the length, transitioning from a thicker base to a thinner tip. This dimensional variation allows optimization of both strength (at the base) and penetration (at the tip) within a single component.
2Quantity of substance
If the amount of material used for the tooth is reduced to lower cost, then the manufacturing cost is reduced, but the strength and robustness of the tooth deteriorates
Solution Approach 1:
Material is concentrated where it is most needed for strength (at the attachment end and root) while being reduced at the tip where penetration is the primary function. This non-uniform material distribution optimizes both strength and material efficiency.
Solution Approach 2:
The tooth is designed as a replaceable wear part with optimized material usage, accepting that it will eventually wear out and need replacement. The design minimizes material while ensuring sufficient service life for the intended application.
3Reliability
If a conventional coupling with through holes is used to attach the tooth to the adaptor, then the attachment is secured, but the pin may break or deform under considerable loads
Solution Approach 1:
The coupling is divided into multiple contact surfaces distributed along the cavity walls, rather than relying on a single pin connection. This segmentation distributes the mechanical loads across multiple points of contact between the tooth and adaptor.
Solution Approach 2:
The coupling mechanism transitions from a one-dimensional pin insertion to a multi-dimensional contact system where surfaces along the cavity walls engage with corresponding surfaces on the adaptor, distributing loads in multiple directions.
4Reliability
If a conventional coupling is used to secure the tooth, then the attachment is strong, but the removal of worn-out teeth becomes complicated requiring hammering
Solution Approach 1:
The coupling system allows for dynamic insertion and removal of the tooth without requiring permanent deformation or specialized tools. The contact surfaces are designed to engage firmly during operation but allow easy disengagement when needed.
Solution Approach 2:
The tooth and adaptor coupling is designed to be self-securing during operation through the distributed contact surfaces, yet allows for simple manual removal without requiring external forces or tools beyond basic hand operations.
Data Source
AI summary
A tooth for attachment to the lip of a bucket of a working machine via an adaptor, having a cavity for receiving a portion of the adaptor, the cavity extending between first and second opposed outer working surfaces (12, 14) from an open end (104) to a bottom end (105); the cavity (103) delimited by an inner wall (102) having first and second facing inner walls (106, 107), and opposing side walls (108), interconnecting the first and second inner walls (106, 107). The cavity defines a back portion (BP) along the Y axis and between the plane spanned by the X and Z axes and the open end of the cavity, a front portion (FP) along the Y axis and between the plane spanned by the X and Z axes and the bottom end of the cavity; and a stepped portion (SP), interconnecting the back portion and the front portion.