Mower Blade Reverse-Travel Control Without Engine Restart
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Solution Overview
Problem
Existing work vehicles require engine restart when switching from reverse to forward travel, reducing mowing work efficiency.
Innovation Solution
A work vehicle with a system of switches and pedals that allows the mowing blade to rotate during reverse travel and automatically disengage when switching to forward travel, preventing unnecessary engine restarts and ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine is stopped when reverse travel is detected to ensure safety, then safety is improved, but mowing work efficiency deteriorates due to engine restart requirements
Solution Approach 1:
The patent applies dynamics by making the clutch engagement state changeable based on travel direction. The clutch is disengaged during reverse travel and engaged during forward travel, allowing the mowing blade rotation state to dynamically adapt to the vehicle's movement direction. This resolves the contradiction by enabling safety during reverse travel while maintaining productivity during forward travel without engine restarts.
Solution Approach 2:
The patent changes the operational parameter of the clutch (engaged/disengaged state) based on travel direction detection. When reverse travel is detected, the clutch parameter changes to disengaged, stopping the mowing blade. When forward travel is detected, the clutch parameter changes to engaged, allowing the mowing blade to rotate. This parameter change approach resolves the contradiction between safety and efficiency.
2Productivity
If the mowing blade rotates during reverse travel to maintain work continuity, then mowing work efficiency is improved, but safety deteriorates due to potential accidental forward movement with rotating blade
Solution Approach 1:
The patent makes the clutch engagement state dynamic based on travel direction. The system automatically disengages the clutch when reverse travel is detected, stopping the mowing blade to prevent safety accidents. When forward travel is detected, the clutch re-engages to resume mowing. This dynamic adaptation resolves the contradiction between maintaining work continuity and ensuring safety.
Solution Approach 2:
The patent applies preliminary anti-action by proactively disengaging the clutch before potential safety hazards can occur. When reverse travel is detected, the system preemptively stops the mowing blade rotation, preventing the possibility of accidental forward movement with a rotating blade. This preliminary safety measure resolves the contradiction by prioritizing safety while allowing work resumption when safe.
3Reliability
If multiple switches and control mechanisms are added to prevent accidental blade rotation, then safety is improved, but device complexity increases
Solution Approach 1:
The patent makes the existing clutch mechanism multi-functional. The same clutch that controls power transmission to the mowing blade also serves as a safety device by being automatically disengaged during reverse travel. This eliminates the need for separate safety mechanisms, resolving the contradiction between safety and device complexity.
Solution Approach 2:
The patent merges the safety control function with the existing clutch mechanism. Instead of adding separate safety switches and control systems, the invention combines the safety function with the power transmission control, using the clutch's engagement/disengagement state to control both power delivery and safety. This merging approach resolves the contradiction by achieving safety without increasing device complexity.
Data Source
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AI summary
The invention provides a work vehicle with a high mowing work efficiency that does not require a restart of an engine when an advancing direction of the work vehicle is switched from a reverse direction to a forward direction. The work vehicle includes a work machine (4) that mows grass, and stops rotation of a mowing blade (48) of the work machine (4) when the reverse travel of the work vehicle is detected. The work vehicle includes a first switch (21) that causes the mowing blade (48) of the work machine (4) to rotate when the work vehicle travels in reverse. In the case where the work vehicle is switched from the reverse travel to travel other than the reverse travel after an on-signal of the first switch (21) is input, input of an on-signal of the first switch (21) is canceled.