Dual-Blade Mower Synchronization for Collision-Free Cutting
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Solution Overview
Problem
Dual-blade mowers often experience blade collisions or leave uncut grass due to misaligned rotation trajectories, leading to inefficiencies in cutting performance.
Innovation Solution
A mower design featuring a synchronization member connected to two electric motors driving the blades, maintaining a phase difference of greater than 0 degrees and less than 90 degrees, with blades positioned to avoid collisions and ensure complete cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two blades are disposed in two cutting decks one to one in a dual-blade mower, then the cutting width and productivity are improved, but the blades may collide with each other when their rotation trajectories intersect
Solution Approach 1:
A synchronization member is introduced as an intermediary mechanism between the two electric motors. This synchronization member includes synchronization gears that engage with gear wheels on the output shafts of both motors, acting as a mediator to coordinate their rotational phases and prevent blade collision while maintaining independent motor operation
Solution Approach 2:
The synchronization mechanism provides mechanical feedback between the two motor systems. The synchronization gears transmit rotational phase information from one motor to the other, creating a feedback loop that automatically adjusts and maintains proper phase difference to prevent blade intersection
2Reliability
If the rotation trajectories of the two blades do not intersect, then blade collision is avoided, but uncut grass is left behind
Solution Approach 1:
The system dynamically controls the phase difference parameter between the two motors, maintaining it within the optimal range of greater than 0 degrees and less than 90 degrees. This parameter adjustment allows the blades to achieve proper spatial separation for collision avoidance while maintaining sufficient overlap for complete grass cutting
3Power
If two independent electric motors are used to drive the blades, then the drive flexibility and power are improved, but the phase synchronization between motors is difficult to control
Solution Approach 1:
The patent replaces complex electronic phase synchronization control systems with a purely mechanical synchronization mechanism. The synchronization gears and gear wheels create a mechanical linkage that automatically maintains proper phase relationship between the two independent motors, eliminating the need for sensors, controllers, or electronic feedback systems
Data Source
AI summary
A mower includes a body including a housing assembly, a cutting element used for performing a cutting function and including a first blade and a second blade, a chassis for accommodating at least part of the cutting element, a drive assembly including a first electric motor configured to drive the first blade and a second electric motor configured to drive the second blade, and a battery pack configured to power the drive assembly. The mower further includes a synchronization member drivingly connected to the first electric motor and the second electric motor.