Rotary Hammer Tool Holder Carbide Coating Wear Resistance
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Solution Overview
Problem
Power tools with rotary hammer mechanisms face challenges in enhancing durability to effectively transmit both striking and rotating power to tool accessories, as existing coatings do not adequately address wear and complexity in design.
Innovation Solution
A power tool with a tool holder featuring a carbide layer of a group 5 element, such as vanadium carbide, on the rotation transmitting part to suppress wear and integrate the striking element, reducing parts count and enhancing durability, while allowing for both hammering and rotating motions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is formed on the hammer surface to prevent cracking, then the hammer durability is improved, but the rotation transmitting part wear is not sufficiently suppressed
Solution Approach 1:
The patent applies a carbide coating specifically to the rotation transmitting part (chisel or drill bit interface) rather than uniformly coating the entire hammer. This localized coating approach addresses the specific wear problem at the rotation interface while maintaining the structural integrity of the hammer body. The carbide layer is selectively deposited on the surface that contacts the tool accessory during rotation, providing targeted wear resistance where it is most needed.
Solution Approach 2:
The patent uses a composite structure combining the hammer body material (typically steel) with a carbide coating layer. This composite material approach creates a multi-layer system where the base material provides structural strength and the carbide coating provides surface hardness and wear resistance. The combination of these two materials with different properties solves both the structural integrity requirement and the wear resistance requirement simultaneously.
2Adaptability or versatility
If multiple separate components are used for striking and rotation transmission, then the functions are clearly separated, but the device complexity and parts count increase
Solution Approach 1:
The patent merges the striking element and rotation transmitting part into a single integrated component. The chisel or drill bit serves dual functions: it transmits both the hammering blows and the rotational motion to the tool accessory. This integration eliminates the need for separate striking and rotation transmission components, reducing parts count while maintaining functional versatility. The single component is designed to handle both linear impact forces and rotational torques simultaneously.
3Object-affected harmful factors
If a carbide layer is formed on the rotation transmitting part, then wear resistance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent specifies particular parameters for the carbide coating process, including coating thickness (0.01-10 μm) and coating material composition (carbide of group 5 elements). By controlling these parameters, the manufacturing process achieves optimal wear resistance while minimizing process complexity. The specified thickness range ensures sufficient protection without requiring excessive material deposition, and the selection of group 5 element carbides provides effective wear resistance with established deposition techniques.
Data Source
AI summary
A power tool having a rotary hammer mechanism is configured to produce hammering motion for driving a tool accessory along a driving axis and rotating motion for rotating the tool accessory around the driving axis. The power tool has a tool holder that is configured to removably hold the tool accessory. The tool holder has a rotation transmitting part configured to transmit rotating power to the tool accessory. A layer formed of carbide of a group 5 element of a periodic table is formed on the rotation transmitting part.