Mower Baffle System for Clipping Discharge Control
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Solution Overview
Problem
Side discharge mower decks face issues with clumping and buildup of grass clippings due to inadequate discharge and direction of clippings, leading to inefficient cutting and dispersal.
Innovation Solution
A mower baffle system with elongated baffles and an open throat portion is introduced to direct the flow of grass clippings from rotary cutting blades to a discharge opening, improving cutting efficiency and dispersal by creating a baffle chamber with strategically positioned arcuate portions and semi-circular baffle portions that guide clippings effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional side discharge mower deck is used, then the structure is simple, but grass clippings are not sufficiently discharged or directed to the side discharge opening, leading to clumping and buildup
Solution Approach 1:
The baffle system is divided into multiple discrete baffles (first baffle, second baffle, third baffle) positioned at different locations within the mower deck. Each baffle performs a specific function in directing clippings toward the discharge opening, creating a segmented flow control system that improves discharge efficiency while maintaining manageable complexity
Solution Approach 2:
The baffles act as intermediary elements between the cutting blades and the discharge opening. These intermediate structures guide and redirect the flow of grass clippings through the mower deck, ensuring efficient discharge while preventing direct contact between clippings and the deck interior surfaces that would cause buildup
2Ease of operation
If no baffle system is used, then the device complexity is low, but grass clippings clump and aggregate on the ground and build up on the underside of the mower deck
Solution Approach 1:
The baffles are strategically positioned at specific locations within the mower deck where clipping flow needs to be directed. The first baffle is positioned to redirect clippings from the cutting area, the second baffle further guides them toward the discharge opening, and the third baffle ensures proper exit direction. This localized placement optimizes clipping dispersal without requiring a complete structural overhaul
Solution Approach 2:
The baffles incorporate curved and arcuate surfaces that match the circular motion of the cutting blades. These curved surfaces effectively redirect the rotating flow of clippings generated by the blade rotation, utilizing the natural centrifugal and directional forces to guide clippings toward the discharge opening without creating turbulence or clumping
3Productivity
If the baffle system uses large radius arcuate portions, then the structure is simpler, but it cannot effectively direct the flow of grass clippings to the discharge opening
Solution Approach 1:
The baffle system employs asymmetric geometry with the first arcuate portion having a larger radius and the second arcuate portion having a smaller radius. This asymmetric design creates varying degrees of curvature that effectively guide clippings through different stages of the discharge process, with tighter curves near the discharge opening providing more precise directional control
Solution Approach 2:
The baffle geometry is designed to work dynamically with the rotating cutting blades. The arcuate portions of the baffles are positioned and shaped to interact with the continuous circular motion of the blades, effectively capturing and redirecting the dynamic flow of clippings as they are thrown outward by blade rotation, thereby enhancing directional control
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 baffle system enhances the dispersal of clippings, reduces blowout from under the mower deck, and ensures even cutting by effectively directing grass clippings to the discharge opening, addressing the clumping and buildup issues in side discharge mower decks.
Implementation Method 1
The first baffle is positioned between i) the first and second cutting blades and ii) the front wall for directing the flow of discharge to the discharge opening
Data Source
AI summary
A multiblade lawn mower including a mower deck having a plurality of cutting blades rotatably disposed therein. A first baffle is positioned within the mower deck between the cutting blades and a front wall of the mower deck and extends substantially continuously between the sides of the mower deck. A second baffle is positioned in the mower deck rearwardly of the cutting blades. The first and second baffles each include a plurality of arcuate baffle portions which define at least one open throat portion therebetween. The first baffle includes at least first, second and third arcuate portions. A third baffle is positioned within the mower deck and extends from adjacent a discharge opening of the mower deck into a circular path defined by peripheral ends of a cutting blade adjacent the discharge opening.