Reciprocating Tool Counterweight Layout for Vibration Suppression
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Solution Overview
Problem
Conventional reciprocating tools, such as saber saws, experience vibrations in both the reciprocating direction and orthogonal directions due to the counterweight configuration, affecting work performance and processing precision.
Innovation Solution
A reciprocating tool design featuring a housing, motor, output part, first and second rotary bodies with weight parts, where the center of gravity of these bodies is strategically positioned to rotate in opposite directions, maximizing vibration suppression by optimizing the mass distribution and arrangement of weights within the tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the center of gravity of rotary bodies is positioned to suppress vibrations, then vibration reduction is achieved, but the structural complexity increases
Solution Approach 1:
The first and second rotary bodies are integrated into a single gear structure where they share common components. The rotary bodies are positioned adjacent to each other and rotate in opposite directions, combining vibration suppression functionality while minimizing structural complexity.
Solution Approach 2:
The gear structure serves multiple functions: it transmits rotational motion from the motor to the output shaft and simultaneously houses two counterweights that suppress vibrations. The motion converting part integrated into the gear assembly performs both motion conversion and vibration cancellation.
2Object-affected harmful factors
If two rotary bodies with weight parts are added to suppress vibrations in orthogonal direction, then vibrations in orthogonal direction are reduced, but the device complexity increases
Solution Approach 1:
The vibration suppression function is segmented into two distinct rotary bodies that rotate in opposite directions, each handling different vibration components. This segmentation allows targeted cancellation of vibrations in orthogonal directions while maintaining a relatively simple overall structure.
Solution Approach 2:
Instead of adding complex active vibration control systems, the invention uses passive counterweights that rotate in the opposite direction to the primary rotary body. This inverted approach uses the natural rotational motion to generate counteracting centrifugal forces, simplifying the control mechanism.
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 design effectively reduces vibrations in both the reciprocating and orthogonal directions, enhancing work performance and processing precision by canceling centrifugal forces and allowing for a more compact tool structure.
Implementation Method 1
The center of gravity of the first rotary body and the center of gravity of the second rotary body are separated farthest from the output part when the output part is positioned in the first position. The center of gravity of the first rotary body and the center of gravity of the second rotary body are closest to the output part when the output part is positioned in the second position.
Data Source
AI summary
Providing a reciprocating tool capable of reducing vibrations generated during operations and improving work performance and processing precision. A reciprocating tool includes a transmission gear part 61 and a counter weight part 62. The transmission gear part 61 includes a bevel gear 611 and a weight 611A. The bevel gear 611 is rotatable in a first direction about an axis B by receiving a drive force of a motor 3. The weight 62A is rotatable in a second direction opposite to the first direction about the axis B by receiving the drive force of the motor 3. A center of gravity 61G of the transmission gear part 61 and a center of gravity 62G of the counter weight part 62 are separated farthest from a blade mounting part 8 when the blade mounting part 8 is positioned in a rearward position. The center of gravity 61G of the transmission gear part 61 and the center of gravity 62G of the counter weight part 62 are closest to the blade mounting part 8 when the blade mounting part 8 is positioned in a forward position.