Rotatable Tool Holder Vibration Absorption
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Solution Overview
Problem
Existing power tools, such as hammers and hammer drills, face challenges in reducing the transmission of external forces caused by irregular motion or run-out of the tool bit during operation, leading to vibration in the tool body.
Innovation Solution
The power tool incorporates a tool holder that can rotate about a pivot on the z-axis, intersecting with the y- and x-axes, coupled with elastic elements to absorb and deform, thereby reducing the transmission of external forces to the tool body. Additionally, a spherical connection and secondary elastic elements are used to further mitigate vibration by allowing smooth rotation and absorbing axial reaction forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid tool holder is used to hold the tool bit, then the tool bit is securely positioned, but external forces caused by irregular motion or run-out are transmitted to the tool body, causing vibration
Solution Approach 1:
The tool holder is designed to change its structural parameters dynamically - remaining rigid in the axial direction for secure tool bit positioning, while becoming flexible in radial directions to absorb external forces. This is achieved through the hollow cylindrical structure with radial thickness variations that provide rigidity where needed and flexibility where needed.
Solution Approach 2:
The tool holder is segmented into multiple functional regions: a front end region for holding the tool bit, a rear region extending into the tool body, and intermediate regions with varying wall thicknesses. This segmentation allows different parts of the tool holder to perform different functions - rigid support where needed and vibration absorption where needed.
2Object-affected harmful factors
If vibration-proofing mechanisms are added to reduce vibration transmission, then user comfort is improved, but the device complexity increases
Solution Approach 1:
The tool holder performs multiple functions simultaneously: it holds the tool bit securely, transmits axial driving forces, and absorbs radial external forces causing vibration. This multi-functionality eliminates the need for separate vibration-proofing mechanisms, reducing overall device complexity while maintaining vibration reduction benefits.
Solution Approach 2:
The vibration absorption function is merged into the tool holder structure itself rather than being implemented as a separate mechanism. The hollow cylindrical structure with controlled wall thicknesses integrates vibration damping capabilities directly into the component that already exists for holding the tool bit.
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
This configuration effectively reduces vibration in the tool body by absorbing external forces caused by run-out and reaction forces, enhancing user comfort and tool stability during operations like hammering and drilling.
Implementation Method 1
The elastic element applies a biasing force to the tool holder in such a manner as to hold the tool holder in a predetermined rotational position or an initial position with respect to the tool body
Implementation Method 2
Then the elastic element absorbs this rotation of the tool holder by elastic deformation. Thus, the external force which is caused by run-out of the tool bit acted upon by the reaction force from the workpiece during operation is not easily transmitted to the tool body
Data Source
AI summary
It is an object of the invention to reduce transmission of an external force caused by run-out of a tool bit to a tool body in a power tool is provided. A representative power tool which performs a predetermined operation by linear motion of a tool bit in its axial direction has a tool body, a tool holder that holds the tool bit in its front end region and extends in the axial direction of the tool bit, and an elastic element. A rear region of the tool holder opposite from the front end region extends into the tool body, and in the extending region, the tool holder is coupled to the tool body such that the tool holder can rotate about a pivot on a z-axis defined by an axis of the tool bit, in directions of y- and x-axes which intersect with the z-axis. The elastic element applies a biasing force to the tool holder in such a manner as to hold the tool holder in a predetermined position or an initial position with respect to the tool body.