Dual-Blade Mower Deck Flow Guide for Grass Discharge
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Solution Overview
Problem
Existing mowers with multiple cutting parts face challenges in grass discharge capability, leading to increased load on the electric motor and potential locked-rotor issues due to inefficient grass clipping flow management.
Innovation Solution
The mower incorporates a flow guide member between the rotation center lines of the blades, guiding grass clippings from one blade to merge with those from another blade before discharge, and includes a grass outlet on the side of the second blade, ensuring efficient airflow paths and reducing load on the second blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cutting parts are arranged side by side to increase cutting amount, then productivity is improved, but grass discharge capability deteriorates due to limited space in a single cutting deck
Solution Approach 1:
The cutting deck is divided into multiple independent cutting chambers (first cutting chamber and second cutting chamber), each with its own blade and grass outlet. This segmentation allows each chamber to independently discharge grass clippings, avoiding the bottleneck of a single discharge path and enabling efficient handling of increased cutting volume from multiple blades.
Solution Approach 2:
The patent transitions from a single-plane cutting arrangement to a multi-level three-dimensional structure with cutting chambers arranged at different heights and positions. The first and second cutting chambers are positioned at different vertical levels, creating multiple discharge paths in different spatial dimensions, which resolves the space limitation for grass discharge.
2Productivity
If multiple blades are arranged in a single cutting deck, then productivity is improved, but the load on the electric motor increases causing locked-rotor issues
Solution Approach 1:
The cutting deck is segmented into multiple independent cutting chambers, each with its own blade and motor drive system. This segmentation distributes the cutting load across multiple independent zones, preventing any single motor from being overloaded by the combined resistance of multiple blades cutting simultaneously in a confined space.
Solution Approach 2:
The flow guide member acts as an intermediary component that manages grass clipping flow between cutting chambers. By properly guiding and distributing grass clippings, it prevents accumulation that would otherwise increase resistance and load on the motor blades, thereby reducing the risk of locked-rotor conditions.
3Device complexity
If grass clippings from multiple blades are discharged through a single outlet, then device complexity is reduced, but grass discharge efficiency deteriorates
Solution Approach 1:
Instead of using a single grass outlet for multiple blades, the patent segments the discharge system into multiple independent outlets (first grass outlet and second grass outlet), each serving specific cutting chambers. This segmentation enables parallel discharge paths, significantly improving grass discharge efficiency while maintaining manageable system complexity through modular design.
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 enhances grass discharge efficiency, reduces the load on the second blade, and prevents locked-rotor problems while maintaining side discharge performance and grass shredding effectiveness.
Implementation Method 1
The first blade is driven by a first electric motor to rotate in a first direction to generate a first airflow that drives grass clippings to flow toward the grass outlet
Implementation Method 2
the first airflow includes a first part and a second part. The first part flows toward the grass outlet through a first flow path; and the second part flows toward the grass outlet through a second flow path
Data Source
Figure 1
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AI summary
A mower includes a cutting assembly at least partially accommodated in a cutting chamber and including a first blade and a second blade that are adjacently arranged along a configuration direction and have the same direction of rotation; and a mower deck formed with or connected to a flow guide member, where the flow guide member has a first end facing a grass outlet and a second end facing away from the grass outlet in the extension direction of the flow guide member, and the first end and the second end are located on two sides of a first plane, respectively.