Cast Idler Wheel Structure Without Welded Joint Weak Points
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing idler wheels in the earthmoving, mining, and construction industries are typically manufactured as assemblies with multiple joints, leading to increased costs, decreased reliability, and weak points that necessitate maintenance and downtime.
Innovation Solution
The idler wheel is manufactured as a unitary component using a casting process, with a hub, outer rim, and side plates formed integrally, and features apertures and ribs to support the hollow core during casting, reducing material usage while enhancing robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the idler wheel is manufactured as an assembly with multiple joints, then it is easier to manufacture individual components, but the reliability decreases and maintenance needs increase
Solution Approach 1:
The patent merges multiple separate components (hub, side plates, outer rim) into a single unitary structure formed by casting. This eliminates the need for joints and connections between components, thereby improving reliability while maintaining manufacturability through the casting process.
2Ease of manufacture
If the idler wheel is manufactured as an assembly with welded joints, then individual components can be produced separately, but weak points are created that limit useful life
Solution Approach 1:
The patent combines all structural components into a unitary cast structure, eliminating welded joints that create weak points. The casting process allows the entire idler wheel to be formed as one piece, thereby extending useful life by removing failure points while maintaining ease of manufacture through established casting techniques.
3Strength
If the idler wheel is made as a solid component, then strength is maximized, but material usage increases and costs increase
Solution Approach 1:
The patent segments the idler wheel structure by creating a hollow interior with strategic wall thickness variations. The side plates have different thicknesses at different locations, and ribs are added for reinforcement, allowing material to be placed only where structurally necessary. This reduces overall material usage while maintaining required strength through optimized material distribution.
Solution Approach 2:
The patent applies local quality by varying the thickness of side plates and adding ribs in specific locations where structural support is needed. The side plates have maximum thickness next to the hub and minimum thickness next to the outer rim, with the ratio controlled within a specific range. This localized material distribution maintains strength where required while reducing material usage in less critical areas.
4Ease of manufacture
If the side plate thickness is uniform, then manufacturing is simpler, but the structure cannot optimize material usage while maintaining strength
Solution Approach 1:
The patent implements local quality by specifying that the side plates have non-uniform thickness, with a maximum thickness next to the hub and a minimum thickness next to the outer rim. The ratio between maximum and minimum thickness is controlled within a specific range (1.05 to 2.00). This allows material to be concentrated where structural support is most needed (near the hub) while reducing material in less critical areas, optimizing the balance between strength and material usage.
Data Source
AI summary
An idler wheel includes a hub, an outer rim, and a pair of side plates that form an interior cavity extending radially between the outer rim (110) and the hub, and axially between the pair of side plates. The first side plate defines a maximum side plate axial thickness disposed radially next to the hub in a cross-sectional plane containing a radial direction, and an axis of rotation, as well as a minimum side plate thickness disposed radially next to the outer rim. A ratio of the maximum thickness to the minimum thickness ranges from 1.325 to 1.900.