Intake Manifold Blow-by Gas Diffusion Plate
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Solution Overview
Problem
Existing intake devices for multicylinder engines lack a mechanism to facilitate equal distribution of blow-by gas into respective cylinders, leading to unequal distribution, which affects power output and exhaust performance.
Innovation Solution
The intake device incorporates a blow-by gas inlet positioned downstream of a butterfly-type throttle valve in the intake manifold, ensuring blow-by gas is caught in a high-speed intake air flow, and an oil reservoir to manage oil mist, facilitating even distribution across cylinders while maintaining a compact engine design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If blow-by gas is returned to intake air without a diffusion facilitation device, then environmental pollution can be suppressed by burning the gases, but the distribution of blow-by gas into respective cylinders becomes unequal
Solution Approach 1:
A diffusion plate is introduced as an intermediary component between the blow-by gas inlet and the intake air passage. This plate creates a diffusion passage that forces the blow-by gas to mix thoroughly with the intake air before reaching the cylinders, ensuring equal distribution while maintaining the environmental benefit of burning the gases.
Solution Approach 2:
The diffusion plate utilizes a porous structure with multiple small holes that allow blow-by gas to pass through while being forced to mix with intake air. The porous nature of the plate creates numerous flow paths that promote uniform distribution of the gas mixture across all cylinders.
2Stability of the object's composition
If a diffusion device is added to facilitate blow-by gas distribution, then equalization of distribution can be achieved, but device complexity increases
Solution Approach 1:
The diffusion plate serves multiple functions simultaneously: it diffuses the blow-by gas, mixes it with intake air, and acts as a flow distributor. By combining these functions into a single component, the device complexity is minimized while achieving the desired equalization of gas distribution.
Solution Approach 2:
The porous diffusion plate provides an elegant, simple structure that achieves complex flow distribution patterns without requiring multiple separate components. The inherent porosity of the material creates the necessary flow paths and mixing zones in a single, integrated element.
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 ensures uniform distribution of blow-by gas and oil mist into all cylinders, enhancing power output and exhaust efficiency while suppressing environmental pollution by effectively burning the gases.
Implementation Method 1
diffusion of the blow-by gas (12) into the intake air is facilitated
Implementation Method 2
blow-by gas (12) flowing from the blow-by gas inlet portion (2) into the intake air introducing portion (4) gets caught in a high-speed downward intake air flow (13) throttled and guided by the throttle valve (9)
Implementation Method 3
even if the oil mist included in the blow-by gas (12) is condensed in the intake air introducing portion (4), the oil accumulates in the oil reservoir (11)
Data Source
AI summary
An intake manifold 1 for a multicylinder engine includes a collector portion 3 extending in a front-rear direction, an intake air introducing portion 4 disposed at a center in the front-rear direction of the collector portion 3, and branch portions 7, 7 led out from front and rear end portions 5 and 6 of the collector portion 3, the branch portions 7 are connected to an intake port of a cylinder head, a throttle body 8 is disposed at an upper portion of the intake air introducing portion 4, the throttle body 8 has a butterfly-type throttle valve 9, a valve shaft 10 of the throttle valve 9 is oriented in the front-rear direction, a blow-by gas inlet portion 2 is provided to the intake air introducing portion 4 of the intake manifold 1, and the blow-by gas inlet portion 2 is disposed on a side to which a lower end portion 9a of the half-open throttle valve 9 is directed and on a downstream side of the lower end portion 9a of the throttle valve 9. Thus equalization of distribution of blow-by gas into the cylinders can be facilitated.