Reciprocating Power Tool Counterweight for Two-Direction Vibration
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Solution Overview
Problem
Electric tools such as reciprocating saws and hammers experience vibration due to frequent changes in movement direction, leading to reduced service life and operator fatigue, as existing counterweight solutions often introduce additional vibration effects.
Innovation Solution
An electric tool design featuring a rotary wheel with an eccentric structure and a counterweight that performs reciprocating swinging movements, balancing inertial forces in both the primary and perpendicular directions to minimize vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an additional eccentric mass is provided on a rotary wheel to balance inertial force in the vertical direction, then vibration in the vertical direction is reduced, but a force component is generated in the horizontal direction perpendicular to the vertical movement direction, triggering vibration side effect
Solution Approach 1:
The patent applies counterweight principles by providing a counterweight member that reciprocates linearly in the vertical direction opposite to the action member. This counterweight balances the inertial force of the action member in the vertical direction without generating harmful horizontal force components, thereby reducing vibration in both vertical and horizontal directions simultaneously.
Solution Approach 2:
The patent inverts the conventional approach by having the counterweight reciprocate in the opposite direction to the action member. When the action member moves downward, the counterweight moves upward, and vice versa. This inversion allows the counterweight to generate inertial force that opposes and balances the action member's inertial force, effectively canceling out vibration without creating perpendicular force components.
2Object-generated harmful factors
If another counterweight apparatus is provided to balance the inertial force component of the first eccentric mass in the horizontal direction, then the vibration side effect is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the functions of multiple counterweights into a single counterweight member. This single counterweight performs dual functions: (1) balancing the inertial force of the action member in the vertical direction, and (2) counteracting the horizontal force components generated by the eccentric mass. By combining these functions into one integrated component, the patent reduces device complexity while maintaining effective vibration reduction in all directions.
Solution Approach 2:
The counterweight member is designed with multi-functionality, serving both as a vertical balance weight and as a countermeasure against horizontal vibration. The counterweight's reciprocating motion and strategic positioning enable it to address multiple vibration issues simultaneously, eliminating the need for separate dedicated counterweights for each direction and thereby simplifying the overall device structure.
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 design effectively reduces vibration, prolongs tool service life, and enhances operator comfort by balancing inertial forces in both movement directions, reducing the need for additional counterweight mass and minimizing perpendicular vibrations.
Implementation Method 1
A centrifugal resultant force borne by the rotary wheel during rotation has a first inertial force component in a direction opposite to a direction of an inertial force of the action member and a second inertial force component in the perpendicular direction
Implementation Method 2
the action means frequently changing movement direction causes vibration in the electric tool due to the effect of inertia
Data Source
AI summary
An electric tool includes a rotary wheel driven to rotate around a central axis thereof, an action member configured to bear a cutter of the electric tool, and a counterweight. The rotary wheel drives the action member such that it reciprocates linearly in a first direction. The rotary wheel simultaneously drives the counterweight such that it not only reciprocates linearly in the first direction in an opposite manner to the action member, but also performs reciprocating swinging movement in a plane perpendicular to the central axis. The first direction is parallel to the plane.