Mower Blade Overload Disengagement Mechanism for Hard-Obstacle Protection
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Solution Overview
Problem
Conventional mower blades face damage from hard obstacles and insufficient cutting capacity for dense weeds, leading to potential harm to the blade holder and drive motor.
Innovation Solution
An active-passive dual overload disengagement mechanism for mower blades, featuring a blade holder connected to a drive motor, with internal and external toothed discs that engage and disengage based on torque thresholds, controlled by a servo motor and elastic members to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional soft mower blade is used, then damage to the blade holder is prevented, but cutting capacity for dense and tough weeds is insufficient
Solution Approach 1:
The blade holder is designed with movable components including a blade holder sleeve that can shift axially, an internal toothed disc that can disengage from the external toothed disc, and a control rod with axial limiting device that enables dynamic state changes. This dynamic structure allows the system to adapt between cutting mode and protection mode based on operating conditions.
Solution Approach 2:
The system changes the transmission state parameter between engaged and disengaged states. The elastic member (spring) provides variable engagement pressure that can be adjusted by the adjustment disc, allowing the system to maintain reliable engagement during normal operation while enabling disengagement under excessive load or impact conditions.
2Productivity
If a conventional rigid mower blade is used, then cutting capacity for tough weeds is sufficient, but damage to the blade holder and drive motor occurs upon impact with hard obstacles
Solution Approach 1:
The internal toothed disc and external toothed disc act as intermediary elements between the drive motor and the mower blade. These toothed discs can engage to transmit power for cutting tough weeds, and disengage to protect the blade holder and motor from damage when impacting hard obstacles, serving as a protective mediator in the power transmission chain.
Solution Approach 2:
The system incorporates an automatic overload protection mechanism where the elastic member and axial limiting device enable the blade holder to automatically disengage from the drive motor when excessive force is detected during operation, providing self-protection without external intervention.
3Productivity
If the blade holder is designed for strong cutting capacity, then tough weeds can be cut, but the structure becomes more complex with additional control mechanisms
Solution Approach 1:
The control mechanism operates autonomously using the elastic member (spring) that automatically engages and disengages the internal toothed disc from the external toothed disc based on load conditions. The axial limiting device with adjustment disc provides self-adjusting capability, reducing the need for complex external control systems while maintaining strong cutting capacity.
Solution Approach 2:
The control rod is integrated with the blade holder assembly, combining the control function with the existing structural components. The axial limiting device merges the disengagement control with the blade holder's mechanical structure, reducing overall system complexity while enabling the blade holder to cut tough weeds effectively.
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
Effectively cuts tough weeds while protecting the blade holder and drive motor from impact damage by actively or passively disengaging the transmission state upon encountering hard obstacles.
Implementation Method 1
an elastic member (spring) is fixed on an inner wall of an open end of the blade holder sleeve; one end of the elastic member abuts against an end surface of an end of the internal toothed disc away from the adapter shaft
Implementation Method 2
the other end of the control rod is connected to a servo motor, where the servo motor can drive the control rod to move the blade holder to a preset position
Data Source
AI summary
Provided is an active-passive dual overload disengagement mechanism for a mower blade. The active-passive dual overload disengagement mechanism for a mower blade includes a blade holder and a control rod, where the blade holder is configured to connect an output shaft of a drive motor to the mower blade in a transmission manner, and release a transmission state between the output shaft of the drive motor and the mower blade when the mower blade impacts against a hard obstacle. According to the present invention, the mower blade is an external sheet structure. Blades of two mower blades are provided symmetrically, and can cut a tough weed. The control rod includes one end connected to the blade holder, and the other end connected to a servo motor. The servo motor can drive the control rod to move the blade holder to a preset position.