Excavator Wear Assembly Stabilizing Surfaces
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Solution Overview
Problem
Existing wear assemblies for excavating equipment face challenges in achieving enhanced stability, strength, durability, penetration, safety, and ease of replacement, as they are prone to wear and stress concentrations under heavy loading conditions.
Innovation Solution
The wear assembly features a nose and socket with complementary stabilizing surfaces extending parallel to the longitudinal axis, providing a stronger and more stable construction by distributing high loads through robust central portions, reducing stress concentrations, and incorporating angled surfaces to resist vertical and side loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional wear assemblies are used with simple nose and socket structures, then the device complexity is low, but the strength and stability deteriorate under heavy loading conditions
Solution Approach 1:
The patent applies local quality by providing stabilizing surfaces at specific locations on the nose and socket components. These surfaces are positioned to bear against each other in the longitudinal direction, concentrating strength enhancement where it is most needed under heavy loading conditions, rather than uniformly strengthening the entire component.
Solution Approach 2:
The patent introduces stabilizing surfaces that extend in the longitudinal dimension of the assembly, adding a new dimensional aspect to the nose-socket connection. This longitudinal stabilization complements the traditional radial connection, creating a more robust three-dimensional structural relationship that resists heavy loading.
2Stability of the object's composition
If conventional wear assemblies are used without stabilizing surfaces, then the manufacturing is simple, but the stability deteriorates under vertical and side loads
Solution Approach 1:
The stabilizing surfaces are provided locally on the nose and socket components at positions optimized for stability. By concentrating these stabilizing features at specific locations rather than throughout the entire component, the patent achieves enhanced stability while minimizing the impact on manufacturing complexity.
Solution Approach 2:
The stabilizing surfaces are configured with asymmetric orientations - one surface on the nose and a corresponding surface on the socket that bear against each other at specific angles. This asymmetric arrangement provides effective resistance to both vertical and side loads while maintaining manufacturability.
3Strength
If the nose structure is extended to carry high loads, then the strength improves, but the stress concentrations increase at extreme bending fibers
Solution Approach 1:
The patent extracts the load-bearing function from the extreme outer fibers of the nose structure by introducing internal stabilizing surfaces. These surfaces bear against each other to carry high loads, allowing the nose to be designed without excessive extension that would create stress concentrations at the bending fibers.
Solution Approach 2:
The stabilizing surfaces are configured beforehand to bear against each other and distribute loads through the robust central portions of the nose. This pre-configured load path prevents stress concentrations from developing at extreme bending fibers during operation, enhancing reliability.
Data Source
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AI summary
A wear member (12) for excavating equipment comprises a rearward-opening socket (70) for receiving a base (15) secured to the excavating equipment, and an opening (160) for receiving a lock (16) to releasably hold the wear member to the base. The socket has a longitudinal axis (34) and includes (i) a front end (60) with a front wall (98) transverse to the longitudinal axis to bear against a front wall (36) of the base, and a top stabilizing surface (90) and a bottom stabilizing surface (92) to bear against front bearing surfaces on the base, and (ii) a rear end (62) with a top wall, a bottom wall and side walls (100-103) extending rearward from the front end, at least one of the top and bottom walls including a pair of rear stabilizing surfaces (110, 111 or 112, 113) inclined relative to each other in different transverse directions so as to laterally converge inward toward a central location along the respective top or bottom wall (100 or 101) to define an inward projection and bear against complementary surfaces (40-43) in a recess (127) in the base to resist both vertical and horizontal loads during excavating. The top stabilizing surface, said bottom stabilizing surface, and each said rear stabilizing surface axially extend substantially parallel to the longitudinal axis.