Rear Discharge Mower Auxiliary Plates for Grass Flow
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Solution Overview
Problem
Conventional rear discharge type mower apparatuses face challenges in precisely discharging mowed grass to the rear due to insufficient wind generation by the rotating blade, leading to inefficient grass discharge.
Innovation Solution
The design incorporates a blade housing with a top plate, front wall, and side walls, featuring a rotatable blade and strategically positioned guide plates that extend along the rotation path of the blade, with downstream plate portions located radially inside the rotation path to enhance wind flow and direct cut grass away from adjacent blades, ensuring effective rear discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide plate is positioned outside the rotation area of the rotating blade, then the blade can rotate freely without interference, but the wind generation ability is insufficient leading to poor grass discharge precision
Solution Approach 1:
The guide plate is repositioned from a location outside the blade rotation area to a location that overlaps with the rotation area in the radial dimension. This dimensional change allows the guide plate to be positioned both within the rotational envelope and in the path of discharged grass, simultaneously ensuring blade rotation reliability and improving grass discharge precision through enhanced wind guidance.
Solution Approach 2:
The guide plate acts as an intermediary element between the rotating blade and the discharged grass. By positioning the guide plate to overlap with the rotation area, it serves as a mediator that channels the wind generated by the blade more effectively, improving the precision of grass discharge while the blade continues to rotate freely.
2Manufacturing precision
If a rotating blade with high wind-generating ability is used, then grass can be discharged more precisely to the rear, but the device complexity and blade design requirements increase
Solution Approach 1:
The guide plate serves as an intermediary that enhances the effectiveness of the wind generated by the blade. Instead of requiring a more complex high-performance blade, the guide plate mediates between the existing blade and the grass discharge process, channeling the wind more effectively to improve precision without increasing blade design complexity.
Solution Approach 2:
The invention replaces the need for a mechanically complex high-performance blade with a simpler guide plate structure. The guide plate provides the additional wind guidance function through its positioning and geometry, substituting the need for complex blade aerodynamics with a simpler mechanical guidance structure.
3Productivity
If the guide plate extends into the rotation path of the blade, then wind flow is enhanced for better grass transport, but the blade rotation may be interfered with
Solution Approach 1:
The guide plate is positioned in another dimension relative to the blade rotation - specifically, in the radial dimension where it overlaps with the rotation area. This positioning allows the guide plate to extend into the rotation path radially while maintaining clearance in other dimensions, enhancing wind flow for grass transport without interfering with blade rotation.
Solution Approach 2:
The guide plate is positioned to overlap with specific portions of the rotation area where it can most effectively guide the discharged grass. This localized positioning optimizes the wind flow enhancement in the critical discharge region while minimizing any potential interference with blade rotation in other areas.
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 generates stronger wind flow to efficiently transport and discharge mowed grass to the rear, minimizing leakage towards other blades and improving the overall discharge efficiency.
Implementation Method 1
wind generated by rotation of the rotating blade is strong and thus easily flows along the guide plate
Implementation Method 2
cut grass transported by discharged wind that has been generated by the corresponding blade is moved away from an adjacent blade
Data Source
AI summary
A rear discharge type mower apparatus includes: a blade housing having a top plate, a front wall and at least one side wall and a first front guide plate and a second front guide plate. Each of the first and second front guide plates are located rearwardly of the front wall and have a shape extending substantially along a rotation path of a corresponding blade. The mower apparatus also includes a first auxiliary plate and a second auxiliary plate. A portion of the second auxiliary plate and the first auxiliary plate extend parallel to each other such that an opening that is opposed to a mowed grass discharge opening is formed by the rearward ends of the linear portion and the first auxiliary plate. The lower edges of the first and second auxiliary plates are closer to the top plate than the corresponding blade.