Impact Tool Disk Spring Axial Force Design
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Solution Overview
Problem
Existing impact tools face challenges in maintaining a compact size while ensuring smooth operation across both high and low load conditions, due to the limitations of elastic members in providing appropriate biasing forces.
Innovation Solution
The impact tool incorporates a motor, a spindle, a tool holding shaft, a hammer, and an elastic member, specifically a disk spring, which is positioned between the flange and the hammer to provide a predetermined elastic force. This configuration allows for a compact design while maintaining the necessary force for effective operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a coil spring is used as the elastic member, then the elastic force can be adjusted, but the axial dimension increases
Solution Approach 1:
The patent changes the type of elastic member from a coil spring to a disk spring, which fundamentally alters the geometric parameters and force-generation characteristics. The disk spring provides high elastic force in a compact axial dimension by utilizing radial and thickness dimensions instead, directly resolving the contradiction between force magnitude and axial length
Solution Approach 2:
The invention transitions from using axial compression (coil spring) to radial compression (disk spring), effectively moving the elastic deformation from one dimension (axial) to another dimension (radial/thickness). This dimensional change allows the elastic member to generate high force without increasing axial dimension
2Force
If an elastic member with high elastic force is used, then high load operation is improved, but low load operation becomes difficult
Solution Approach 1:
The patent introduces an elastic force adjusting mechanism that allows the elastic force to be dynamically adapted to different operating conditions. The mechanism includes adjustable components (such as adjustable nuts or positioning elements) that enable operators to modify the precompression amount or elastic member configuration, transitioning from a static high-force system to a dynamic adjustable system that accommodates both high and low load operations
Solution Approach 2:
The invention enables parameter adjustment of the elastic force by providing mechanisms to change the precompression amount, elastic member thickness, or material properties. This allows the same disk spring to be configured for different load conditions, resolving the contradiction between high force requirement and operational ease across varying loads
3Volume of moving object
If the impact tool size is reduced, then portability is improved, but the elastic member cannot provide sufficient biasing force
Solution Approach 1:
The patent changes the geometric parameters of the elastic member by using a disk spring with optimized thickness, outer diameter, and inner diameter ratios. These parameter changes enable the elastic member to generate sufficient biasing force in a compact form factor, directly resolving the contradiction between tool size and force capability
Solution Approach 2:
The invention may utilize composite material structures or high-strength materials for the disk spring to achieve high elastic force in a reduced volume. By selecting materials with superior mechanical properties, the elastic member can provide adequate biasing force without requiring large dimensions, thus resolving the size-force contradiction
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 use of a disk spring in the impact tool enables the achievement of a high elastic force with reduced axial dimension, allowing for smooth operation across varying load conditions without increasing the tool's size.
Implementation Method 1
an elastic member disposed between a front surface of the flange and a support surface of the hammer disposed forward of the flange in the axial direction. The elastic member may include a disk spring
Data Source
AI summary
An impact tool includes: a motor; a spindle that includes a spindle shaft and a flange provided at a rear portion of the spindle shaft and that is rotated by a rotational force of the motor; a tool holding shaft at least a part of which is disposed forward of the spindle; a hammer that is supported by the spindle shaft and impacts the tool holding shaft in a rotation direction; and an elastic member disposed between a front surface of the flange and a support surface of the hammer disposed forward of the flange in the axial direction. The elastic member includes a disk spring.