Angled Chisel Holder Shank Reduces Shear Loading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Chisel holders for road milling machines experience mechanical loading issues due to torsion and shear forces, leading to potential breakage of the fastening shank, especially under transverse loads during milling operations.
Innovation Solution
The chisel holder design incorporates angled supporting surfaces and a self-centering mechanism, with a fastening shank configuration that reduces mechanical loading by distributing forces more uniformly and minimizing transverse loads, achieved through specific angular orientations and transition regions between supporting surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the fastening shank is formed with a relatively large shank cross-sectional area to resist transverse loads, then the strength is improved, but the device complexity and mechanical loading (torsion and shear) at the fastening shank location increase
Solution Approach 1:
The supporting side is divided into multiple supporting surface regions (first supporting surface region and second supporting surface region) that are angled relative to each other. This segmentation distributes the transverse loads across multiple contact points with the base part, reducing the concentrated mechanical loading on the fastening shank while maintaining sufficient strength.
Solution Approach 2:
The patent introduces angled supporting surface regions that create additional geometric constraints in multiple dimensions. The first and second supporting surface regions are arranged at angles to each other, providing support in different directional dimensions, which stabilizes the chisel holder against transverse loads without requiring increased fastening shank cross-sectional area.
2Stability of the object's composition
If the first supporting surface region and first counterpart supporting surface region are approximately orthogonal to the chisel longitudinal axis for stable support, then the stability is improved, but transverse loads cause considerable torsion and shear loading on the fastening shank
Solution Approach 1:
The patent employs asymmetric angular orientation of the first and second supporting surface regions relative to the chisel longitudinal axis. Rather than both surfaces being orthogonal, they are arranged at different angles to each other, creating an asymmetric support geometry that provides stable positioning while redirecting transverse loads away from the fastening shank, thereby reducing torsion and shear forces.
3Adaptability or versatility
If a spacing is provided between the body region and the opposite side of the base part to allow repositioning, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent incorporates a repositioning space in advance within the base part structure, allowing the chisel holder to be repositioned if wear occurs in the supporting surface regions. This preliminary design feature enables adaptability without requiring complex adjustment mechanisms, as the geometric configuration itself provides the repositioning capability.
Data Source
AI summary
A chisel holder comprises a body zone (12) having a chisel receiving opening (18) that is open at least in the direction of a chisel insertion end (14) of the body zone (12), and also comprises a fastening shaft (26) which extends from a supporting end (20) of the body zone (12) and has a longitudinal shaft axis (LB), the body zone (12) having a first supporting surface region (22) at its supporting end (20). Said chisel holder is characterized in that the body zone (12) has a second supporting surface region (24) at its supporting end (20), said second surface region (24) extending at an angle from the first supporting surface region (22), or/and the first supporting surface region (22) comprises a first supporting surface (28) and a second supporting surface (30) extending at an angle from the first supporting surface (28).