Vent Member Tilt for Engine Hood Cooling
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Solution Overview
Problem
Existing work vehicle engine covers face inefficiencies in releasing internal air after the engine is stopped, leading to inadequate cooling of the engine compartment and associated components.
Innovation Solution
The design incorporates a vent member with a first opening connected to vent holes and a second opening communicating with the engine cover's interior, tilted upward to enhance airflow and temperature differences, preventing external heat elevation around the vent holes, thereby facilitating efficient air release and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a ventilation member is disposed inside vent holes to feed outdoor air into the engine cover interior, then air intake during engine operation is improved, but air release after engine stoppage is hindered
Solution Approach 1:
The vent member is divided into two distinct openings: a first opening that continues to the vent hole for outdoor air intake, and a second opening that communicates with the engine cover interior for hot air exhaust. This segmentation allows independent optimization of air intake and exhaust pathways, resolving the contradiction between improving air intake during operation and enabling efficient air release after stoppage.
Solution Approach 2:
The vent member is configured to upwardly tilt toward the engine cover, introducing a dimensional orientation element. This tilting creates a temperature difference between the first opening (exposed to cooler outdoor air) and the second opening (exposed to hotter interior air), generating natural convection airflow from the second opening to the first opening, thereby enabling efficient hot air release after engine stoppage.
2Temperature
If multiple vent holes are provided in the side plate, then air intake is improved, but temperature elevation of outdoor air in the surroundings occurs
Solution Approach 1:
The side plate is designed with selective perforation: a region located laterally to the vent hole is made imperforate (non-perforated). This local quality change concentrates the venting function at the specific vent hole location, preventing outdoor air from being heated by proximity to the engine cover and maintaining cooler air temperature for intake, while still achieving sufficient air intake through the optimized vent member configuration.
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
This configuration allows for effective cooling of the engine cover interior and high-temperature components, such as the exhaust gas aftertreatment unit, even after the engine is stopped, by generating airflow that directs hot air outside through the vent holes.
Implementation Method 1
a difference in temperature between the first and second openings of the vent member can be enlarged. Therefore, airflow directed from the second opening to the first opening within the vent member can be generated
Data Source
AI summary
A hydraulic excavator includes an engine hood covering an engine from above and a vent member disposed inside the engine hood. The engine hood includes a third side plate. The third side plate is provided with a lower side vent hole group, and simultaneously, a region located laterally to the lower side vent hole group is imperforate. The vent member covers the lower side vent hole group with a first opening from inside. A second opening of the vent member communicates with an interior of the engine hood. The vent member upwardly tilts toward the engine hood.