Spline Hammer Tool Structure for Lower Wear and Easier Replacement
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Solution Overview
Problem
Current hammer assemblies for work machines experience high wear and maintenance issues due to the use of cylindrical bushings, which are heavy, difficult to replace, and result in uneven stress distribution, leading to frequent tool replacement and reduced efficiency.
Innovation Solution
The proposed solution involves a hammer tool with a spline section and a tool section, where the spline section includes two sectors with multiple spline grooves separated by a spacer, and the tool section has a smaller diameter than the spline section, allowing for improved stress distribution and easier replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cylindrical bushings are used in hammer assemblies, then the tool can be supported and guided, but the bushings are heavy, difficult to replace, and cause high contact pressure leading to accelerated wear
Solution Approach 1:
The bushing is divided into multiple modular segments that can be independently replaced. Each segment is a separate component that fits into the hammer assembly, allowing individual segments to be swapped out without replacing the entire bushing structure. This segmentation makes replacement easier and reduces downtime while maintaining support and guidance functions.
2Reliability
If cylindrical bushings are used in hammer assemblies, then the tool can be supported and guided, but the bushings result in high contact pressure and accelerated wear
Solution Approach 1:
The bushing design transitions from a traditional cylindrical shape to a segmented structure with multiple contact surfaces distributed in different dimensions. The segments create multiple contact points along the length of the bushing, distributing the contact pressure across a larger area and reducing peak stresses on any single point.
3Ease of manufacture
If cylindrical bushings are machined from solid stock, then the bushings can be manufactured, but this causes wasted material and makes the bushings very large and heavy
Solution Approach 1:
The bushing is designed as multiple smaller segments rather than a single large cylindrical piece. Each segment can be manufactured from smaller stock material, significantly reducing material waste during machining. The segmented structure also reduces the overall weight of the bushing assembly while maintaining structural integrity and support functions.
4Productivity
If cylindrical bushings are used, then the tool can be inserted and supported, but the design leads to frequent tool replacement and reduced efficiency
Solution Approach 1:
The segmented bushing design allows for pre-assembled segments to be prepared in advance. When wear occurs, pre-manufactured replacement segments can be quickly installed without requiring on-site machining or complex assembly procedures. This preliminary preparation of replacement parts significantly reduces replacement time and maintains operational efficiency.
Data Source
AI summary
A tool for a hydraulic hammer of a work machine is disclosed herein. The tool comprises a spline section and a tool section. The spline section includes a first spline sector including at least six spline grooves and a second spline sector including at least six spline grooves. The first spline sector and second spline sector are separated by a spacer. The tool section diameter is 3.2-4.8 times larger than the spline groove diameter and the tool section diameter is smaller than a spline section diameter.