Impact Tool Counterweight Nesting for Compact Design
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Solution Overview
Problem
Existing impact tools face challenges in size reduction due to the need for multiple clearances to avoid interference when a counter weight is disposed outside the inner housing, which limits the tool body's compactness.
Innovation Solution
The counter weight is positioned inside the inner housing, reducing the need for clearances between the counter weight and the outer housing, and is designed to rotate on a pivot shaft, allowing it to counteract vibration effectively while being formed in a closed ring-like shape for enhanced durability and ease of assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the counter weight is disposed outside the inner housing, then the counter weight can be easily assembled and disassembled, but multiple clearances are required between the counter weight and the housing, preventing size reduction of the tool body
Solution Approach 1:
The counter weight is disposed inside the inner housing, nesting the counter weight within the housing structure. This eliminates the need for external clearances between the counter weight and outer housing, allowing the tool body to be reduced in size while maintaining the vibration reduction function.
Solution Approach 2:
The counter weight is positioned in the radial direction within the inner housing rather than externally, changing the spatial arrangement from an external radial position to an internal radial position. This dimensional repositioning allows the tool body to be more compact.
2Volume of moving object
If the counter weight is disposed inside the inner housing, then the tool body size can be reduced by minimizing clearances, but the counter weight may interfere with other components during operation
Solution Approach 1:
The inner housing is provided with a specific opening structure at a predetermined location that allows the counter weight to swing through a controlled range of motion. This localized structural feature ensures the counter weight does not interfere with other components while maintaining its vibration reduction function.
Solution Approach 2:
The counter weight is designed to swing dynamically within the inner housing rather than being fixed, allowing it to move through a controlled arc that avoids interference with stationary components while maintaining contact with the swinging member for effective vibration reduction.
3Volume of moving object
If the counter weight is disposed inside the inner housing, then the number of clearances is reduced for compactness, but the counter weight must be precisely positioned to avoid interference
Solution Approach 1:
The counter weight is pre-positioned and fixed to the swinging member at a specific location before assembly. This preliminary positioning ensures that when the counter weight swings inside the inner housing, it follows a predetermined path that avoids interference with other components, reducing the need for high manufacturing precision during final assembly.
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 allows for a more compact tool body design by minimizing the number of required clearances and enhances vibration reduction and durability, while also simplifying mounting and repair processes.
Implementation Method 1
a counter weight that is disposed within the internal space of the inner housing and reduces vibration caused when the tool bit is driven
Data Source
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AI summary
An impact tool in which a tool body can be effectively reduced in size is provided. The impact tool has a motor 111, a swinging member 129 that is driven by the motor 111 and swings in the axial direction of the tool bit, a striking mechanism 115 that is driven by components of linear motion in the axial direction of the tool bit in the swinging motion of the swinging member 129, a connecting part 124 that connects the swinging member 129 and the striking mechanism 115, a housing member 151 that houses at least the connecting part 124 in an internal space 156, and a counter weight 155 that is disposed within the internal space 156 of the housing member 151 and reduces vibration caused when the tool bit is driven.