Off-Road Air Cleaner Layout for Low-Resistance Intake Filtration
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Solution Overview
Problem
Existing off-road vehicles face challenges in achieving smooth intake air flow through air cleaners, which act as resistance to the intake air flow, affecting the performance of internal combustion engines and continuously variable transmissions, while maintaining air purification efficiency.
Innovation Solution
The design includes an air cleaner with an air cleaner case and an air filter that divides the internal space into dirty and clean regions, with an inflow opening larger than half the size of the air filter, allowing intake air to spread evenly and smoothly through the filter, and is protected by protective covers to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an air filter is installed in the air cleaner to purify intake air, then air purification performance is improved, but intake air flow resistance increases
Solution Approach 1:
The patent changes the geometric parameters of the air cleaner case, specifically making the internal space length longer than both the air filter length and the intake duct length. This parameter adjustment allows sufficient space for air flow development and reduces turbulence, thereby decreasing flow resistance while maintaining purification effectiveness.
Solution Approach 2:
The patent extends the air cleaner case in the longitudinal dimension, creating a longer internal space that accommodates both the air filter and provides additional flow development area. This dimensional extension resolves the contradiction by adding spatial capacity without increasing filter density or resistance.
2Reliability
If the air filter size is increased to improve purification efficiency, then air purification performance is improved, but the size of the air cleaner case must be increased
Solution Approach 1:
The patent creates a dynamic air flow path where air enters through the intake duct, passes through the air filter in the dirty air chamber, and flows to the clean air chamber. The longitudinal extension allows the air flow to adapt and develop smoothly, maintaining purification efficiency while optimizing the spatial arrangement to avoid excessive volume increase.
Solution Approach 2:
The air cleaner case is segmented into distinct functional zones: the dirty air chamber containing the air filter, the clean air chamber, and the longitudinal space that connects them. This segmentation allows each zone to be optimized independently, enabling sufficient purification capacity without requiring a proportionally large overall volume.
3Device complexity
If the air cleaner case size is reduced to compact the structure, then device complexity is reduced, but uniform air flow through the air filter becomes difficult to achieve
Solution Approach 1:
The patent resolves the space constraint by extending in the longitudinal dimension rather than increasing width or height. This creates a elongated but compact cross-section, allowing uniform air flow distribution across the air filter while keeping the overall structure space-efficient in lateral dimensions.
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 enhances the intake performance of off-road vehicles by ensuring uniform and smooth air flow through the air filter, improving the performance of both the internal combustion engine and continuously variable transmission, while maintaining air purification efficiency and protecting the intake structure from damage.
Implementation Method 1
an air filter that divides the internal space into a dirty region and a clean region
Data Source
AI summary
An air cleaner includes: an air cleaner case defining an internal space; and an air cleaner element accommodated in the air cleaner case and including an air filter that divides the internal space into a dirty region and a clean region. The air cleaner case includes: an inner surface defining the internal space; an inflow opening located on the inner surface and facing the air filter through the dirty region; and an outflow opening facing the clean region. The air filter extends in a predetermined direction. The inflow opening has a shape extending in the predetermined direction.