Work Vehicle Air Deflector for Engine Cooling and Lawn Protection
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Solution Overview
Problem
Existing lawn mowers face issues with hot air currents generated by engine cooling systems damaging the lawn and requiring additional space for guiding hot air away from the engine output shaft, as they directly contact the ground or require a guide plate that occupies space.
Innovation Solution
A work vehicle design featuring an engine hood, a vehicle body frame, an engine mounting member, and an air deflector that redirects downward-flowing hot air currents through a gap between the engine hood and the vehicle body frame, preventing direct contact with the ground and reducing heat retention in the engine room.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If hot air current is discharged directly downward through the opening below the engine, then cooling efficiency is improved, but the hot air current damages the lawn and requires additional space for guidance
Solution Approach 1:
The patent introduces an intermediary structure (the engine mounting member with its specific opening configuration) that mediates between the hot air current and the ground/lawn. The opening is positioned and sized to allow hot air discharge while the engine mounting member itself acts as a barrier preventing direct contact with the lawn, thus protecting the lawn without requiring additional guide plates.
Solution Approach 2:
The patent changes the discharge direction from purely vertical (downward) to an angled trajectory by positioning the opening at a specific location on the engine mounting member. This dimensional change in the discharge path allows the hot air to be directed away from the lawn while maintaining effective cooling, eliminating the need for additional guiding structures.
2Object-affected harmful factors
If a guide plate is added below the opening to redirect hot air, then lawn damage is prevented, but the device complexity and space requirements increase
Solution Approach 1:
The patent merges the function of hot air guidance into the existing engine mounting member structure. The opening in the engine mounting member serves dual purposes: supporting the engine and directing hot air away from the lawn. This integration eliminates the need for separate guide plates, reducing device complexity and component count.
Solution Approach 2:
The engine mounting member is designed to perform multiple functions: it supports the engine, provides structural stability, and directs hot air current away from the lawn through its opening configuration. This multi-functionality eliminates the need for additional dedicated guidance components, simplifying the overall structure.
3Productivity
If the opening size is increased to improve air flow, then cooling efficiency improves, but more hot air escapes around the engine output shaft
Solution Approach 1:
The patent applies local quality by positioning the opening at a specific location on the engine mounting member and giving it specific dimensional characteristics. The opening is sized and positioned to optimize the balance between allowing sufficient cooling air flow and minimizing hot air escape around the engine output shaft, creating a locally optimized solution rather than a uniform approach.
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 discharges hot air currents away from the engine room and prevents ground contact, maintaining efficient cooling while minimizing space requirements and reducing engine room temperature.
Implementation Method 1
an air deflector configured to guide cooling air flowing downwards along a side face of the engine toward the engine mounting face to the gap
Data Source
AI summary
In a work vehicle, an engine is mounted on an engine mounting face formed in an engine mounting member connected to a vehicle body frame. A gap is formed between a lower end of an engine hood covering the engine from above and the vehicle body frame. An air deflector is provided for guiding cooling air current flowing downwards along a side face of the engine toward the engine mounting face to the gap.