Impact Tool Vibration Isolation via Elastic Element Design
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Solution Overview
Problem
Impact tools experience noise issues due to vibration transmission from the tool accessory and hammering member to the body, which is exacerbated by a large outer metal surface and radial vibration, necessitating effective vibration suppression methods.
Innovation Solution
The impact tool employs elastic elements, such as rubber and O-rings, to connect the tool-accessory holding part and body in the hammering-axis direction and radially, allowing for relative movement and suppressing vibration transmission, while also using a circular cylindrical member with sliding elastic elements to prevent contact and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tool accessory is struck to drive it in the hammering-axis direction, then the processing operation is performed on the workpiece, but vibration is generated and transmitted to the body causing noise
Solution Approach 1:
The patent introduces elastic elements (rubber buffers, O-rings) as intermediary components between the tool accessory and the body. These elastic elements act as vibration isolators that absorb and dampen the vibrations generated during striking, preventing them from being transmitted to the body and generating noise. The elastic elements are positioned at critical vibration transmission paths to effectively decouple the harmful vibrations while allowing the useful hammering motion to pass through.
Solution Approach 2:
The patent changes the mechanical properties of the connection between the tool accessory and body by introducing elastic elements with specific material properties (rubber, elastomers). These materials have high damping coefficients and viscoelastic characteristics that transform the vibration energy from high-frequency oscillations to thermal energy through internal friction, thereby reducing noise while maintaining the functional vibration transmission for hammering operations.
2Strength
If the body has a large outer metal surface, then the structural integrity and strength are improved, but the noise is exacerbated due to vibration of the air by the outer surface
Solution Approach 1:
The elastic elements serve as intermediaries that decouple the body's large metal surface from the vibration sources. By positioning rubber buffers and O-rings between the vibrating components and the body, the elastic elements prevent the body's large surface area from participating in the vibration cycle, thereby eliminating the noise generation mechanism while preserving the structural strength of the metal body.
Solution Approach 2:
The patent segments the vibration transmission path by introducing elastic isolation elements at multiple locations (between tool accessory and body, between hammering member and body). This segmentation creates distinct functional zones: one for structural support (metal body) and another for vibration isolation (elastic elements), allowing the large metal surface to maintain its strength without generating noise.
3Stability of the object's composition
If the tool-accessory holding part and body are connected rigidly, then the structural stability is improved, but the vibration transmission to the body increases causing noise
Solution Approach 1:
The patent transitions from a rigid static connection to a dynamic elastic connection between the tool-accessory holding part and the body. The elastic elements allow for controlled relative movement and vibration isolation while maintaining structural stability during normal operation. The elastic connection adapts to dynamic loading conditions, providing both stability and vibration isolation properties simultaneously.
Solution Approach 2:
The patent employs composite construction by combining metal components (tool accessory, body) with elastic materials (rubber buffers, O-rings). This composite approach creates a hybrid connection system that leverages the strength and stability of metal while incorporating the vibration-damping properties of elastic materials, achieving both structural stability and noise reduction.
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 significantly reduces noise by effectively isolating vibrations from the tool accessory and hammering member, improving the working environment by minimizing noise generated from the body.
Implementation Method 1
The tool-accessory holding part and the body are connected in the hammering-axis direction via a first elastic element so as to be movable relative to each other
Implementation Method 2
connecting the tool-accessory holding part and the body in the hammering-axis direction via the first elastic element so as to be movable relative to each other can suppress transmission of the vibration from the tool-accessory holding part to the body
Implementation Method 3
a second elastic element is interposed between the first hammering member and the body in a radial direction with respect to the hammering axis
Implementation Method 4
the second elastic member which is interposed between the first hammering member and the body in the radial direction can suppress transmission of the vibration from the first hammering member to the body in the radial direction
Data Source
AI summary
An impact tool includes a tool-accessory holding part, a body and a first hammering member. The tool-accessory holding part has a through hole extending in a hammering-axis direction and is configured to hold the tool accessory inserted into the through hole to be movable in the hammering-axis direction. The body is connected to the tool-accessory holding part in the hammering-axis direction and has an internal space communicating with the through hole. The first hammering member is linearly movable in the hammering-axis direction and configured to drive the tool accessory in the hammering-axis direction by colliding with the tool accessory. The tool-accessory holding part and the body are connected in the hammering-axis direction via a first elastic element to be movable relative to each other. A second elastic element is interposed between the first hammering member and the body in a radial direction with respect to the hammering axis.