Reciprocating Power Tool Counterbalance for Vibration Reduction
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Solution Overview
Problem
Reciprocating power tools experience vibration issues due to inertial forces generated by the reciprocating motion, which affect user control and operational safety, leading to reduced utility and precision.
Innovation Solution
A counterbalance mechanism is introduced, comprising a first rotating counterbalance device coaxially arranged with the output gear and a second rocking counterbalance device eccentrically coupled, which work together to balance forces generated by the reciprocating motion, ensuring synchronized operation and reduced vibration.
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 vibration is generated due to inertial forces
Solution Approach 1:
The patent applies counterweight members (first and second counterbalance devices) that are positioned to counterbalance the inertial forces generated by the reciprocating mechanism. These counterweights rotate with the output gear and are strategically positioned to offset the vibratory forces produced during reciprocating motion, thereby reducing overall tool vibration while maintaining cutting capability
2Object-affected harmful factors
If the first counterbalance device is positioned in phase with reciprocating motion, then forces are balanced, but the device becomes complex to accommodate both in-phase and out-of-phase balancing
Solution Approach 1:
The counterbalance mechanism is segmented into multiple independent counterbalance devices (first counterbalance device with rotating counterweight members and second counterbalance device with rocking counterweight member). Each device is responsible for balancing forces at specific phases of the reciprocating cycle, allowing the system to achieve comprehensive force balance while maintaining manageable complexity through functional decomposition
3Ease of operation
If counterbalance devices are added to reduce vibration, then user control and safety improve, but the device complexity increases
Solution Approach 1:
The counterbalance mechanism merges the vibration reduction function with the existing drivetrain components. The counterbalance devices are integrated with the output gear and transmission mechanism, sharing common rotational motion and structural support. This combination approach achieves vibration reduction and improved user control while minimizing additional complexity by reusing existing mechanical elements
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 vibratory forces, enhancing user control, operational safety, and extending tool usage time by balancing inertial forces during both in-phase and out-of-phase positions of the counterbalance devices with the reciprocating shaft.
Implementation Method 1
forces generated by reciprocating motion of the shaft along the axis of operation
Implementation Method 2
forces generated by the first counterbalance device
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.