Self-Propelled Mower Belt Drive for Blade Jam Protection
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Solution Overview
Problem
Existing self-propelled mowers face issues with cutting blade jamming, which affects power output and continuity of mowing operations, often requiring engine shutdown and potentially causing damage to the driving assembly.
Innovation Solution
A self-propelled mower design featuring a transmission mechanism with a swing wheel and tension spring system that adjusts belt tension in real-time, allowing automatic self-protection and seamless operation when encountering hard objects, combined with a gear unit and belt pulley system for cross-transmission and torque adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cutting blades are directly connected to the driving assembly through an output shaft, then the power transmission is direct and simple, but the cutting blades become jammed when hitting hard objects or entangled with debris, affecting power output and continuity of operation
Solution Approach 1:
The patent introduces a belt transmission mechanism as an intermediary between the driving assembly and the cutting blades. The belt acts as a mediator that can slip or break when the blades encounter hard objects or debris, preventing direct transmission of jamming forces to the driving assembly. This resolves the contradiction by maintaining simple structure while ensuring continuous operation through the belt's protective intermediary function.
Solution Approach 2:
The belt transmission system provides beforehand cushioning by being designed to slip or break under excessive load conditions. This preemptive measure protects the driving assembly from damage before jamming forces can cause harm, allowing the mower to maintain reliability and continuous operation even when encountering obstacles.
2Power
If the cutting blades hit hard objects or become entangled with debris, then the power output of the driving assembly is directly affected, but shutting down and restarting the engine reduces work efficiency
Solution Approach 1:
The belt transmission serves as a protective intermediary that isolates the driving assembly from jamming forces. When blades encounter obstacles, the belt slips or breaks rather than transmitting full impact forces, maintaining power output stability and preventing engine shutdown. This resolves the contradiction by preserving both power output and work efficiency simultaneously.
Solution Approach 2:
The belt transmission system provides self-service protection by automatically slipping or breaking when excessive loads are detected, without requiring external intervention or engine shutdown. This self-protecting mechanism maintains continuous operation and work efficiency while protecting the driving assembly from power loss due to jamming.
3Ease of manufacture
If the cutting blades are directly connected to the driving assembly, then installation is convenient, but damage to the driving assembly occurs in serious cases of jamming
Solution Approach 1:
The belt transmission mechanism acts as an intermediary that protects the driving assembly from damage while maintaining installation convenience. The belt can be easily installed and replaced, providing the same ease of manufacture as direct connection while adding protective functionality that prevents damage to the driving assembly during serious jamming events.
Solution Approach 2:
The belt transmission provides beforehand cushioning by being designed to fail safely under excessive loads. This preemptive protective measure preserves the driving assembly's strength and durability while maintaining the simplicity and ease of installation characteristic of direct connection systems.
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 design prevents blade jamming, ensures continuous operation, enhances adaptability, and maintains efficient power transmission, reducing the need for frequent shutdowns and improving overall work efficiency.
Implementation Method 1
The swing arm is provided with a tension spring, and the tension spring is configured to provide a force for the swing wheel to press against the first synchronous belt
Implementation Method 2
the swing wheel is disposed to press against an outer side of the first synchronous belt and push a first side of the first synchronous belt towards a second side of the first synchronous belt
Implementation Method 3
The gear unit includes a first gear and a second gear meshing with each other
Data Source
AI summary
A self-propelled mower includes a frame, a mowing assembly, a moving assembly and a driving assembly. The driving assembly includes a driving member and a transmission mechanism, and the transmission mechanism includes a gear unit and a belt pulley unit. The gear unit is drivingly connected to an output shaft of the driving member. A power shaft of the rotating cutting blade is drivingly connected to the belt pulley unit. The gear unit is configured to transmit power provided by the driving member to the belt pulley unit through a transmission shaft. The belt pulley unit includes a first pulley, a second pulley, and a swing wheel, the first pulley and the second pulley are in transmission connection by a first synchronous belt, the swing wheel is disposed between the first and second pulleys, and the swing wheel is disposed against an outer side of the first synchronous belt.