Counterbalance Mechanism for Reciprocating Tool Vibration Reduction
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Solution Overview
Problem
Vibrations generated by reciprocating mechanisms in power tools adversely affect user control and operational safety, leading to reduced precision and utility during extended use.
Innovation Solution
A counterbalance mechanism incorporating rotating and rocking counterweight members that balance forces generated by the reciprocating motion of the shaft, including a first counterbalance device coaxially arranged with the output gear and a second device performing a rocking motion to counteract inertial forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reciprocating mechanism is used to convert rotary motion to reciprocating motion, then the tool can perform cutting operations, but vibrations are generated that adversely affect user control and operational safety
Solution Approach 1:
The patent employs counterbalance mechanisms with counterweights that rotate in opposition to the reciprocating mechanism's motion. These counterweights generate opposing inertial forces that cancel out the vibrations produced by the reciprocating cutting mechanism, thereby reducing harmful vibrations while maintaining cutting capability
Solution Approach 2:
The patent uses composite counterbalance mechanisms combining multiple components (counterweights, linkages, and mounting structures) that work together to achieve effective vibration cancellation across different frequency ranges and motion directions
2Productivity
If reciprocating motion is used for cutting, then the tool can operate effectively, but user control and operational safety are compromised due to generated vibrations
Solution Approach 1:
Counterbalance mechanisms with strategically positioned counterweights reduce vibrations transmitted to the tool housing and user interface, improving ease of operation and user control while preserving the reciprocating cutting action
3Power
If high-power motor and transmission mechanism are used to drive reciprocating motion, then cutting power is sufficient, but vibrations are generated that reduce precision during extended use
Solution Approach 1:
The counterbalance mechanisms reduce vibrations that would otherwise compromise cutting precision during extended operation, allowing the high-power motor to maintain accurate cutting performance over longer durations
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 counterbalance mechanism effectively reduces vibrations, enhancing user control and operational safety, allowing for extended tool operation without precision loss.
Implementation Method 1
A counterbalance mechanism incorporating rotating and rocking counterweight members that balance forces generated by the reciprocating motion of the shaft
Data Source
AI summary
A reciprocating power tool may include a driving system including a motor and a transmission received in a housing to drive a reciprocating mechanism. A counterbalance mechanism may be coupled between the driving system and the reciprocating mechanism. The counterbalance mechanism may include a rotating counterbalance mechanism including a first rotating counterweight member and a second rotating counterweight member coupled to an output gear of the driving system. The counterbalance mechanism may include a rocking counterweight member coupled between the output gear and the housing. The output gear may include a recessed portion in which the first rotating counterweight member and a clutching system are received.