Intake Air Introduction Pipe Nested in Curved Branch Pipes
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Solution Overview
Problem
The existing intake systems for multi-cylinder engines face challenges in extending the intake air introduction pipe without increasing the external dimension of the engine, leading to increased internal combustion engine dimensions.
Innovation Solution
The intake system design includes curved branch pipes that extend from the downstream end to the upstream end, with the intake air introduction pipe positioned in the space between the branch pipes and the engine, allowing for extension without increasing the external dimension by utilizing dead spaces and symmetric arrangement to equalize air flow and reduce turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the intake air introduction pipe is extended to improve air supply capacity, then the air supply capability is improved, but the external dimension of the intake system increases
Solution Approach 1:
The intake air introduction pipe is nested within the space formed by the curved branch pipes. The pipe extends in the direction of arrangement of the branch pipes, utilizing the dead space between the curved pipes and the engine, thereby extending the pipe length without increasing the external dimension of the intake system.
Solution Approach 2:
Instead of extending the intake air introduction pipe in the conventional radial direction outward from the engine, the pipe is extended in the axial direction parallel to the branch pipes. This dimensional change allows the pipe to utilize the space between the curved branch pipes, achieving extension without increasing external dimensions.
2Ease of manufacture
If branch pipes are arranged radially to simplify structure, then manufacturing is easier, but the engine external dimension increases
Solution Approach 1:
The branch pipes are curved from the radial direction toward the axial direction of the engine. This curvature allows the pipes to follow a path that reduces the external dimension while maintaining the functional connection between the intake chamber and the cylinders, effectively compacting the overall engine layout.
3Ease of operation
If the intake air introduction pipe projects outward to accommodate length, then pipe installation is easier, but the intake system dimension increases
Solution Approach 1:
The intake air introduction pipe is positioned within the space defined by the curved branch pipes and the engine body. This nested arrangement accommodates the pipe length requirement while maintaining a compact overall dimension, as the pipe utilizes the existing space rather than projecting outward.
Data Source
AI summary
Provided is an intake system that enables extension of an intake air introduction pipe without increasing the external dimension of the intake system. The intake system comprises: a plurality of branch pipes (27-30) which are arranged one next to the other and communicate at downstream ends thereof with a plurality of intake ports (14) provided in an engine (10), respectively, each branch pipe extending from the downstream end thereof to an upstream end thereof in a curved manner; an intake chamber (26) communicating with the upstream ends of the branch pipes; and an intake air introduction pipe (25) having a downstream end communicating with the intake chamber, wherein the intake air introduction pipe has a section that extends in a space defined between the branch pipes and the engine in a direction of arrangement of the branch pipes.