Hand-held Work Implement Anti-vibration Element Front Mounting
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Solution Overview
Problem
Existing hand-held work implements with combustion engines face challenges in effectively decoupling vibrations and ensuring adequate cooling while maintaining a compact and ergonomic design, particularly when performing cutting actions close to obstructions.
Innovation Solution
The hand-held work implement incorporates an anti-vibration element fixed to the handle bar and the combustion engine's cylinder in a front region, allowing for a long anti-vibration element that minimizes interference with the cooling air stream and provides efficient damping, while maintaining a compact design by using a helical spring and strategically placing fastening elements to avoid structural obstructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the anti-vibration element is fixed to the cylinder in a rear region of the cylinder, then the handle bar can be positioned for ergonomic handling, but the anti-vibration element length is limited and cooling air stream is impeded
Solution Approach 1:
The patent inverts the conventional arrangement by fixing the anti-vibration element to the cylinder in the front region rather than the rear region. This inversion allows the anti-vibration element to extend further toward the rear, increasing its length and improving vibration damping effectiveness while maintaining ergonomic handle bar positioning.
Solution Approach 2:
The patent optimizes the spatial arrangement by positioning the anti-vibration element to extend along the longitudinal axis of the cylinder from the front region toward the rear, utilizing the length dimension of the cylinder to maximize anti-vibration element length without compromising handle bar ergonomics.
2Reliability
If the anti-vibration element is made longer to improve vibration damping, then vibration decoupling is enhanced, but the cooling air stream to the combustion engine is impeded
Solution Approach 1:
The patent applies local quality by positioning the anti-vibration element specifically in the front region of the cylinder, where it can achieve maximum length for vibration damping while locally adapting to avoid blocking the cooling air stream path that flows along the cylinder.
Solution Approach 2:
The patent introduces a fastening element as an intermediary component that attaches the anti-vibration element to the cylinder in the front region, allowing the anti-vibration element to be positioned optimally for vibration damping while maintaining clear passage for cooling air along the cylinder surface.
3Volume of moving object
If the handle bar is positioned close to the housing for compact design, then the work implement can perform cutting actions close to obstructions, but the anti-vibration element length is constrained
Solution Approach 1:
The patent inverts the conventional arrangement by fixing the anti-vibration element to the front region of the cylinder rather than the rear, which allows the element to extend backward and achieve greater length even when the handle bar is positioned close to the housing for compact design.
4Reliability
If fastening elements are strategically placed to avoid structural obstructions, then the anti-vibration element can be optimized for damping, but the structural integrity must be maintained
Solution Approach 1:
The patent introduces a fastening element as an intermediary component that attaches the anti-vibration element to the cylinder. This fastening element is strategically positioned to avoid interfering with the cooling air stream while maintaining secure attachment and preserving the structural integrity of the cylinder.
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 configuration achieves effective vibration damping and maintains efficient cooling of the combustion engine, enabling precise cutting actions close to obstructions without compromising the tool's ergonomics or performance.
Implementation Method 1
The handle unit and an engine unit are decoupled from one another in terms of vibrations by means of at least one anti-vibration element
Implementation Method 2
a cooling air stream to the combustion engine is not impaired or is only slightly impeded
Data Source
AI summary
A hand-held work implement comprises a housing, at least one tool and a combustion engine for driving the tool. The combustion engine has a cylinder and has a piston which drives a crankshaft in rotation about an axis of rotation. The crankshaft drives a fan impeller. The work implement has a handle unit with a handle bar and has an engine unit, these being connected to one another via anti-vibration elements. The combustion engine has a transverse plane which encompasses the cylinder longitudinal axis and which runs parallel to the axis of rotation of the crankshaft. The transverse plane divides the work implement into a front region, in which a section of the tool that projects out of the housing is arranged, and a rear region. The fixing of the anti-vibration element to the cylinder is realized in the front region.