Blow-by Gas Reflux Structure for Engine Intake Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing reflux structures for blow-by gas in engines face a trade-off between breather chamber capacity and engine power, where increasing chamber capacity increases resistance and decreasing it reduces intake, leading to unstable air-fuel ratios and engine efficiency variations across cylinders.
Innovation Solution
A reflux structure that discharges blow-by gas to the inside of the air funnel's umbrella part, where it is mixed with intake air at lower velocities, allowing for stable air-fuel ratios without the need for a breather chamber on the clean side of the air cleaner, reducing engine resistance and improving power, and is applicable to multi-cylinder engines with a single pipe system to even out intake across cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the capacity of the breather chamber is decreased, then the resistance acting on the piston increases, but the engine power decreases
Solution Approach 1:
The patent extracts the breather chamber from the clean side of the air cleaner and relocates it to the dirty side. This extraction eliminates the conflict between breather chamber capacity and intake air amount, as the breather chamber no longer occupies space needed for clean air intake while still effectively managing blow-by gas reflux.
Solution Approach 2:
The patent changes the spatial dimension by moving the breather chamber from the clean side to the dirty side of the air cleaner. This dimensional relocation allows the system to simultaneously maintain sufficient breather chamber capacity for blow-by gas management and sufficient clean side capacity for intake air, resolving the trade-off relationship.
2Reliability
If a sufficient capacity is ensured for the breather chamber, then the intake amount from the air cleaner is reduced, but the engine power decreases
Solution Approach 1:
The breather chamber is extracted from the clean side environment and placed on the dirty side, allowing sufficient capacity for reliable blow-by gas reflux without compromising clean air intake volume. This extraction resolves the conflict between reflux reliability and engine power.
Solution Approach 2:
The partition wall serves as an intermediary structure that separates the dirty side into two functional zones: one for the breather chamber handling blow-by gas and another for clean air intake. This intermediary structure enables both functions to coexist without interference, maintaining both reflux stability and engine power.
3Stability of the object's composition
If the blow-by gas is discharged to the umbrella part of the air funnel, then the mixing with intake air is improved, but the concentration control becomes difficult
Solution Approach 1:
The patent applies local quality by positioning the discharge port at a specific location on the dirty side where it can effectively mix with incoming air. The discharge port is located to discharge blow-by gas into the flow path of intake air, creating optimal local mixing conditions that stabilize the air-fuel ratio without requiring complex positioning mechanisms.
4Reliability
If a breather chamber is provided on the clean side, then the blow-by gas can be collected, but the number of parts and weight increase
Solution Approach 1:
The patent merges the breather chamber function with the existing dirty side structure of the air cleaner. By utilizing the partition wall and the dirty side space, the system combines blow-by gas collection with the air cleaning function, eliminating the need for a separate breather chamber component and reducing overall weight.
Solution Approach 2:
The dirty side of the air cleaner is given multi-functionality: it serves both as the air filtration chamber and as the location for the breather chamber. This universal use of space eliminates the need for additional components dedicated solely to blow-by gas collection, reducing part count and weight.
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 stabilizes the air-fuel ratio, reduces engine resistance, and improves engine power by evenly distributing blow-by gas across cylinders, while minimizing the number of parts and weight, and enhances gas-liquid separation to prevent oil adhesion and improve engine efficiency.
Implementation Method 1
since the flow velocity on the side closer to the bottom than to the umbrella of the air funnel is lower than that in the vicinity of the suction port, the blow-by gas can be mixed with the intake air over time
Implementation Method 2
the blow-by gas is discharged to the inside of the umbrella part and diffused along the inner peripheral surface of the umbrella part
Implementation Method 3
the wall surface of the air funnel is cooled at all times by the intake air, so that the gas/liquid separation effect to the blow-by gas discharged to the inside of the umbrella part can be enhanced
Implementation Method 4
the blow-by gas is likely to be liquidized. Accordingly, an oil component of the blow-by gas is allowed to adhere to the wall surface of the funnel body to separate a gas component to the umbrella part side
Implementation Method 5
an oil component of the blow-by gas is allowed to adhere to the wall surface of the funnel body to separate a gas component to the umbrella part side
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A reflux structure for blow-by gas that returns blow-by gas generated in an engine (1) to a clean side (27) of an air cleaner (2) to reflux the blow-by gas to the engine (1), the reflux structure for blow-by gas includes: a communication pipe (34) that has a flow path introducing the blow-by gas from the engine (1) to the clean side (27) of the air cleaner (2); and an air funnel (29) that is mounted on the clean side (27) of the air cleaner (2) and introduces intake air from a dirty side (26) into the engine (1), wherein the communication pipe (34) has a discharge port () formed to discharge the blow-by gas to a side closer to a bottom than to an umbrella part (32) of the air funnel (29) around the air funnel (29).