Pneumatic Dynamic Vibration Reducer for Impact Tool
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing impact tools that use a swinging mechanism to drive a tool bit face challenges in effectively reducing vibration due to the increased number of mechanical parts required, which complicates the placement of vibration reduction mechanisms within the tool body, limiting the use of available space.
Innovation Solution
The impact tool incorporates a dynamic vibration reducer with a weight and coil springs that passively reduce vibration, and a pneumatic vibration mechanism that actively drives the weight using air pressure fluctuations, allowing for a more compact design and efficient vibration reduction without increasing the tool's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a mechanical vibration reducing mechanism is used to reduce vibration in the impact tool, then vibration reduction is achieved, but the number of machine parts increases and the mechanism becomes difficult to dispose within the tool body
Solution Approach 1:
The patent replaces the mechanical vibration reducing mechanism with a pneumatic vibration reducing mechanism. Instead of using machine parts to counteract vibration, the invention uses a pneumatic chamber that communicates with the atmosphere through a communication hole, allowing air pressure to act on the piston and counterbalance the reaction force from the swinging member. This substitution eliminates the need for complex mechanical vibration reduction parts while achieving the same vibration reduction effect.
2Object-affected harmful factors
If the vibration mechanism section is disposed on the opposite side of the center of swinging movement from the hammer bit driving mechanism section, then vibration reduction is achieved, but the mechanism cannot be easily disposed within the tool body
Solution Approach 1:
The patent merges the vibration reduction function with the existing hammer bit driving mechanism by integrating the pneumatic chamber and piston into the same structural space. The pneumatic chamber is disposed within the tool body and communicates with the atmosphere, allowing the vibration reduction mechanism to share space with the driving mechanism rather than requiring separate disposal on the opposite side of the center of swinging movement.
3Object-affected harmful factors
If a dynamic vibration reducer is used to reduce vibration, then vibration reduction is achieved, but the mechanism requires active driving and cannot be steadily operated regardless of vibration magnitude
Solution Approach 1:
The patent implements a self-service vibration reduction mechanism where the pneumatic chamber automatically adjusts to counterbalance the reaction force from the swinging member. The communication hole allows air pressure to equalize, and the piston moves passively in response to the swinging motion, eliminating the need for active driving mechanisms. This passive operation ensures steady vibration reduction regardless of the magnitude of vibration, as the system automatically adapts to the swinging motion.
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 solution effectively reduces vibration in impact tools by utilizing a compact dynamic vibration reducer and pneumatic mechanism, improving operational stability and allowing for rational placement within the tool body without increasing its size.
Implementation Method 1
coil springs that passively reduce vibration
Implementation Method 2
pneumatic vibration mechanism that actively drives the weight using air pressure fluctuations
Data Source
Figure 1
Figure 2
Figure 3
AI summary
It is an object of the invention to provide a rational forced vibration of a dynamic vibration reducer in an impact tool that linearly drives a tool bit in an axial direction of the tool bit via a swinging member. An impact tool includes a motor (111), a swinging member (129) that swings in the axial direction of a tool bit (119) by rotation of the motor (111), a driving element (141) that is caused to reciprocate by swinging movement of the swinging member (129) and a first air chamber (143a) in which pressure is fluctuated by reciprocating movement of the driving element (141), and the tool bit (119) is driven by pressure fluctuations of the first air chamber (143a). The impact tool further includes a second air chamber (163) in which pressure is fluctuated by swinging movement of the swinging member (129), and a dynamic vibration reducer (151) having a weight (155) and an elastic element (157) which exerts a biasing force on the weight (155). The weight (155) under the biasing force of the elastic element (157) is forcibly vibrated by pressure fluctuations of the second air chamber (163).