Idler Wheel Alternating Hardness for Track Scalloping
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Solution Overview
Problem
Scalloping of track links in track chains leads to uneven contact with idler wheels and rollers, causing vibration and maintenance issues in track-type vehicles.
Innovation Solution
An idler wheel with alternating regions of different hardness along its circumference, where the softer regions consistently contact the track links to reduce scalloping, achieved through heat treatment to create undulating boundaries separating hard and soft zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the idler wheel has uniform hardness, then the manufacturing process is simple, but the track links develop scallop patterns causing vibration and maintenance issues
Solution Approach 1:
The idler wheel is designed with alternating hard and soft regions around its circumference. The soft regions consistently contact the track links to prevent scallop formation, while the hard regions provide structural support. This local differentiation of material properties resolves the contradiction by improving contact uniformity without requiring complete structural redesign.
Solution Approach 2:
The idler wheel circumference is segmented into alternating hard and soft zones. This segmentation allows different regions to perform different functions - soft regions for consistent contact and scallop prevention, and hard regions for structural integrity. The segmented approach enables the wheel to simultaneously achieve reliability improvement while maintaining manageable complexity.
2Ease of operation
If the idler wheel uses alternating hard and soft regions, then scalloping is reduced and ride comfort improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies heat treatment to modify the physical properties of the idler wheel material, creating alternating hard and soft regions through controlled parameter changes during manufacturing. This allows the wheel to achieve the desired alternating hardness pattern that improves ride comfort by reducing scallop-induced vibrations, while the heat treatment process provides a established manufacturing method to achieve this complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces the formation of scallops on track links, leading to a more even contact and reduced vibration, thereby improving the ride comfort and reducing maintenance needs for the undercarriage.
Implementation Method 1
hardening the material at a first location found on the idler wheel along its circumferential perimeter to a first hardness, and hardening the material at a second location found circumferentially adjacent the first location to a second hardness
Data Source
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AI summary
An idler wheel (200) for use with a track chain (302) of a vehicle that includes a plurality of track pins (306) and bushings (308) comprises a main body (202) that includes a generally cylindrical configuration defining an axis of rotation (A), a circumferential direction (C) and a radial direction (R), the main body (202) including a central portion (204) disposed along the axis of rotation (A) defining an axial extremity of the radial portion, and at least a first outside portion (208) disposed along the axis of rotation (A) that includes alternating regions (244, 246) adjacent each other circumferentially having a different hardness relative to each other.