Electric Pruner Saw Vibration Damping and Compact Layout
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Solution Overview
Problem
Existing electric pruner saws experience significant vibration during operation, making them difficult to control and leading to operator fatigue, and they have a large volume that complicates carrying and storage.
Innovation Solution
The addition of a balancing component that vibrates at the same frequency as the saw but with opposite phase, combined with a repositioned wobble bearing closer to the motor, reduces the overall vibration and compactness of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional wobble bearing structure is used with the wobble bearing located below the motor, then the structural design is simplified, but the device volume becomes large and the swing rod length increases
Solution Approach 1:
The patent inverts the traditional arrangement by positioning the wobble bearing above the motor instead of below it. This inversion allows the rotating rod to be located between the motor and saw rod, shortening the swing rod length and reducing overall device volume while maintaining structural functionality.
Solution Approach 2:
The patent repositions components along the vertical dimension, placing the wobble bearing in the upper portion and the rotating rod in the middle portion. This dimensional rearrangement optimizes space utilization and reduces the device's footprint without compromising mechanical performance.
2Ease of manufacture
If the wobble bearing is positioned farther from the saw rod, then the motor and transmission mechanism are easier to arrange, but the swing rod length increases and device volume expands
Solution Approach 1:
By inverting the vertical arrangement and placing the wobble bearing above the motor, the patent achieves both goals: the motor and transmission mechanism remain easily arrangeable in the lower portion, while the swing rod length is minimized because the wobble bearing is now closer to the saw rod in the upper portion.
3Device complexity
If no balancing component is added, then the device structure remains simple, but vibration amplitude is large causing operator fatigue and control difficulty
Solution Approach 1:
The patent introduces a balancing component that acts as a counterweight system. The balancing block, connected to the rotating rod through a groove structure, generates counter-vibration that offsets the harmful vibrations from the saw blade, reducing overall vibration amplitude and its harmful effects on the operator.
Solution Approach 2:
The patent utilizes mechanical vibration principles by designing a balancing mechanism that vibrates at the same frequency as the saw blade but in the opposite phase. The groove-shaped protrusion on the rotating rod drives the balancing block to produce counter-vibrations that cancel out harmful vibrations through destructive interference.
4Ease of manufacture
If the swing rod length is not shortened, then the wobble bearing can be positioned lower for easier manufacturing, but the device occupies more storage space and is harder to carry
Solution Approach 1:
By inverting the vertical arrangement to position the wobble bearing above the motor, the patent achieves compact swing rod length for portability and easy storage, while the motor and transmission mechanism remain easily manufacturable in the lower portion. This inversion resolves the contradiction between manufacturing ease and compactness.
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 solution significantly reduces vibration amplitude by up to 50% and minimizes the tool's volume, enhancing user control and storage convenience.
Implementation Method 1
the balancing component and a saw vibrate at the same frequency in parallel directions, but the phases of vibration of the balancing component and saw differ by 180°, such that the opposite-phase vibration of the balancing component partially or completely offsets the vibration of the saw
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present invention provides an electric pruner saw, comprising a motor (12), a wobble bearing (13) and a saw (14, 15), and further comprising a balancing component (21); the balancing component (21) and saw (14,15) vibrate at the same frequency in parallel directions, but the phases of vibration of the balancing component (21) and saw (14,15) differ by 180°, such that the opposite-phase vibration of the balancing component (21) partially or completely offsets the vibration of the saw (14,15). Furthermore, the wobble bearing (13) in the pruner saw may be arranged at an upper side of the motor (12), such that a rotating rod (16) of the pruner saw is located between the motor (12) and a saw rod (15); thus, the wobble bearing (13) is closer to the saw rod (15), so the length of a swing rod ()17 of the wobble bearing (13) is shortened, and consequently the various components are arranged more compactly, thus reducing the volume of the pruner saw.