Wear Member Assembly Boss Socket Mounting
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Solution Overview
Problem
Existing wear member assemblies for earth excavating devices face challenges in providing adequate resistance to load forces, difficulty in replacing worn lip shrouds, and inadequate distribution of load between wear members, leading to potential failure of digging tooth assemblies.
Innovation Solution
A wear member assembly featuring a first wear member with a boss and a second wear member with a socket and retaining pin passage, allowing for a secure and removable mounting system between the lip shroud and the lip, with a retaining pin assembly that includes a lock member and body member to distribute loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lip shroud is retained by welding a formation to the lip, then the mounting strength is improved, but the ease of replacement deteriorates
Solution Approach 1:
The mounting system is divided into separate components: a formation welded to the lip, and a retaining pin that secures the lip shroud to the formation. This segmentation allows the lip shroud to be removed by simply extracting the retaining pin without damaging the welded formation, thus maintaining mounting strength while enabling easy replacement.
Solution Approach 2:
The retaining pin acts as an intermediary element between the welded formation and the lip shroud. It provides a removable connection that transfers loads from the lip shroud to the formation, allowing the lip shroud to be easily replaced while maintaining a strong mounting connection through the welded formation.
2Ease of repair
If the lip shroud is retained by a pin extending through the lip shroud and lip, then the ease of replacement is improved, but the mounting strength deteriorates
Solution Approach 1:
The system separates the permanent welded connection (formation to lip) from the removable retention mechanism (retaining pin). The welded formation provides strong structural attachment to the lip, while the retaining pin provides easy removal capability, thus resolving the contradiction between strength and ease of replacement.
Solution Approach 2:
The retaining pin extends through the lip shroud and engages with the welded formation, creating a three-dimensional retention system. This dimensional approach allows the pin to provide both retention and easy removal functionality without compromising the strength provided by the welded formation.
3Reliability
If the adaptors are welded to the lip, then the reliability is improved, but the load distribution deteriorates
Solution Approach 1:
The lip shroud acts as an intermediary element between the adaptors and the lip. It distributes loads from the adaptors across a wider area of the lip, reducing stress concentrations while maintaining the reliable welded connection between adaptors and lip. The lip shroud effectively spreads the force distribution.
4Force
If a strong mount is required between lip shrouds and lip, then the resistance to load forces is improved, but the device complexity increases
Solution Approach 1:
The mounting system is segmented into three simple components: the welded formation, the retaining pin, and the lip shroud. Each component has a specific function, and together they provide strong load resistance without requiring a complex integrated structure. The segmentation simplifies manufacturing and assembly while maintaining strength.
Data Source
AI summary
A wear member assembly for a lip of an earth excavating device comprises a first wear member, a second wear member and a retaining pin. The first wear member is mounted to the lip. The first wear member includes a boss extending outwardly from one of its opposite sides. The second wear member is mounted adjacent the first wear member. The second wear member includes a socket in one of its sides. The socket is adapted to receive the boss of the first wear member. The second wear member includes a retaining pin passage in communication with the socket. The retaining pin is removably located in the retaining pin passage. The retaining pin has a first bearing face adapted to oppose and engage a face of the boss received in the socket and a second bearing face which bears against a load bearing face of the retaining pin passage.