Engine-Driven Work Machine Upper Restricting Means
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Solution Overview
Problem
Conventional engine-driven work machines face challenges with large work units, requiring high-strength restricting means and increased dimensions due to large external forces, leading to excessive deformation and interference between the work unit and frame.
Innovation Solution
The engine-driven work machine design includes upper and lower restricting means strategically positioned to minimize the load on the restricting components, allowing for smaller angle swings and reduced dimensions by placing upper restricting means between the work unit and frame, and using elastic seals to resist movement and impact loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If restricting means is disposed between lower parts of the work unit and the frame, then the amplitude of swing of the work unit can be restricted to within a predetermined angle, but the restricting means receives a large load and requires high strength
Solution Approach 1:
The patent inverts the conventional arrangement by disposing the restricting means between upper parts of the work unit and the frame instead of between lower parts. This inversion changes the fulcrum position from the lower restricting means to the upper restricting means, thereby reducing the load on the restricting means and allowing for smaller angle swings with reduced dimensions
2Ease of operation
If a large gap is provided between upper parts of the work unit and the frame to accommodate large swing angles, then the work unit can swing freely, but the dimensions of the engine-driven work machine increase
Solution Approach 1:
By inverting the restricting means arrangement to the upper parts, the patent enables effective swing restriction with a smaller gap between the work unit and frame. This reduces the overall dimensions of the machine while maintaining adequate swing freedom through the upper fulcrum mechanism
3Stability of the object's composition
If restricting means is positioned between lower parts of the work unit and frame, then swing restriction is effective, but the load on restricting means increases when large external forces are applied
Solution Approach 1:
The patent inverts the position of restricting means from lower to upper parts of the work unit. This inversion changes the mechanical advantage and load distribution, reducing the force burden on the restricting means when large external forces are applied laterally, while maintaining effective swing control through the upper fulcrum arrangement
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 reduces the load on restricting components, enhances durability, minimizes size and weight, and effectively restricts swing and axial movement, preventing interference and deformation while withstanding large impact loads.
Implementation Method 1
when the work unit is running, vibration around the crankshaft is absorbed effectively by deformation of the elastic support members, thus suppressing transmission of the vibration to the frame
Implementation Method 2
elastic support members are disposed between a lower part of the work unit and a frame
Data Source
AI summary
An engine-driven work machine is provided in which elastic support members (11, 11) are disposed between a lower part of a work unit (U) having an engine (3) and a frame (2) having the work unit (U) mounted thereon, the elastic support members (11, 11) being disposed beneath a crankshaft (17) of the engine on either side of a vertical plane (V) passing through the axis of the crankshaft (17), and restricting means (122) is provided between the work unit (U) and the frame (2), the restricting means (122) restricting the amplitude of swing of the work unit (U) around the crankshaft (17) to within a predetermined angle, and the restricting means (122) being disposed between upper parts of the work unit (U) and the frame (2). Even when the work unit receives a large external force in the lateral direction, swing of the work unit can thereby be restricted to within the predetermined angle.