Dual-Blade Mower Flow Guide for Lower Blade Load
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Solution Overview
Problem
Mowers with multiple cutting parts face challenges in grass discharge capability due to increased cutting pressure and load on the blades, leading to issues like locked rotors, especially when the grass outlets are located within the same cutting deck.
Innovation Solution
Incorporating a flow guide member between the rotation center lines of the blades to direct grass clippings from one cutting deck to the outlet, splitting the airflow paths to reduce load on the blades and prevent locked rotors, while maintaining efficient grass discharge.
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 blade load increases leading to locked rotors
Solution Approach 1:
The airflow path is segmented into multiple independent channels using flow guide members. Each cutting part has its dedicated airflow channel that directs grass clippings independently to the grass outlet, preventing accumulation and overloading on any single blade.
Solution Approach 2:
Flow guide members are introduced as intermediary components between the cutting parts and the grass outlet. These members actively direct and separate the grass clippings flow from different cutting parts, ensuring balanced load distribution and preventing locked rotor conditions.
2Device complexity
If grass outlets are located within one cutting deck to improve structure, then device complexity is reduced, but grass discharge capability deteriorates
Solution Approach 1:
The single grass outlet is served by multiple segmented airflow channels that originate from different cutting parts. Each channel is independently configured to efficiently transport grass clippings from its respective cutting part to the common outlet, maintaining high discharge capability while using a unified outlet structure.
Solution Approach 2:
The flow guide members extend in the depth direction of the cutting chamber, creating three-dimensional airflow paths. This vertical dimension allows multiple cutting parts to discharge grass clippings through separate channels that converge at the outlet, effectively increasing discharge capability without adding more outlets.
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 flow guide member effectively reduces grass collection in the secondary cutting deck, decreases blade load, and prevents locked rotors, ensuring efficient grass discharge without affecting side discharge performance.
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 second blade is driven by a second electric motor to rotate in the first direction to generate a second airflow that drives grass clippings to flow toward the grass outlet
Data Source
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.