Impact Rotary Tool Buffer Member Gap Regulation
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Solution Overview
Problem
Existing impact rotary tools often generate collision noise and vibrations due to collisions between the anvil and the output shaft, which can be transmitted to the housing and cause discomfort during use.
Innovation Solution
The impact rotary tool incorporates a buffer member with an elastic member that compresses under load, regulating the gap distance between the anvil and the output shaft to prevent direct collision, thereby reducing noise and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the anvil and output shaft are positioned close to each other to reduce tool size, then compactness is improved, but collision noise and vibrations increase
Solution Approach 1:
A buffer member is introduced as an intermediary element between the anvil and output shaft. This buffer member absorbs the collision energy and prevents direct contact between the anvil and output shaft, thereby reducing collision noise and vibrations while allowing the components to remain in close proximity for compact tool design.
2Manufacturing precision
If the gap between anvil and output shaft is reduced to minimize clearance, then manufacturing precision is improved, but collision frequency increases
Solution Approach 1:
The buffer member is pre-installed between the anvil and output shaft to provide cushioning before collisions occur. This beforehand cushioning mechanism absorbs impact energy and prevents direct collisions, allowing for precise clearance control during manufacturing while maintaining reliability by preventing collision frequency.
3Object-affected harmful factors
If the elastic member compression is increased to enhance buffering, then vibration reduction is improved, but force transmission is reduced
Solution Approach 1:
The buffer member's elastic properties are optimized by selecting appropriate material parameters and compression characteristics. The elastic member is designed to compress within specific parameter ranges that provide effective vibration reduction while maintaining sufficient force transmission capability for tool operation.
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 minimizes the chances of collision noise and vibration transmission to the housing, enhancing user comfort and reducing mechanical stress on the tool components.
Implementation Method 1
The buffer member includes an elastic member to be elastically deformed in a thrusting direction aligned with a rotational axis of the output shaft
Implementation Method 2
The buffer member is interposed between the anvil and the output shaft. The elastic member is compressed in the thrusting direction under a load transmitted in the thrusting direction from the hammer
Data Source
AI summary
An impact rotary tool includes a hammer, an anvil, an output shaft, a housing, a bearing (first bearing), and a buffer member. The buffer member includes an elastic member. The anvil has a first facing region. The output shaft has a second facing region. The buffer member is interposed between the anvil and the output shaft. The buffer member regulates a gap distance between the second facing region and the first facing region such that when a maximum load is transmitted from the hammer to the elastic member, the second facing region faces the first facing region with a gap left between the second facing region and the first facing region in a thrusting direction.