Intake Valve Seal Surface Segmentation for Pressure Loss Control
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Solution Overview
Problem
Existing intake devices face challenges in maintaining sealing properties while minimizing pressure loss due to the overhang portion on the inner wall surface, which narrows the intake air flow path and leads to increased pressure loss and potential misalignment of the intake control valve.
Innovation Solution
The intake device incorporates a seal surface with a first seal surface having a protruding inner contact portion and an outer contact portion, and a second seal surface without an inner contact portion, allowing for proper contact adjustment and reduced flow path narrowing, thereby maintaining sealing properties and minimizing pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an overhang portion is formed over the entirety of four sides of the inner wall surface to suppress striking sounds, then sealing properties are improved, but the intake air flow path narrows and pressure loss increases
Solution Approach 1:
The overhang portion is segmented into two distinct regions: a first overhang portion with a first height on a first side of the inner wall surface, and a second overhang portion with a second height on a second side of the inner wall surface. This segmentation allows different portions of the seal surface to have different overhang amounts, balancing sealing effectiveness with flow path preservation.
Solution Approach 2:
Different regions of the seal surface are given different local characteristics through varying overhang heights. The first side receives a first overhang portion with a first height optimized for sealing, while the second side receives a second overhang portion with a second height optimized for maintaining flow path area. This local differentiation resolves the contradiction between sealing and flow.
2Loss of energy
If the overhang amount is reduced to suppress pressure loss increase, then flow path area is improved, but the seal lip and overhang portion contact at deviated positions causing valve misalignment
Solution Approach 1:
The seal surface is divided into multiple regions with different overhang heights. The first side has a first overhang portion with a first height that ensures proper contact position for sealing accuracy, while the second side has a second overhang portion with a second height that reduces flow path narrowing. This segmentation allows each region to be optimized for its specific function.
Solution Approach 2:
Different local overhang heights are provided at different positions of the seal surface. The first side receives a first overhang portion with a first height that maintains manufacturing precision for valve alignment, while the second side receives a second overhang portion with a second height that minimizes pressure loss. This local quality differentiation resolves the contradiction between alignment precision and pressure loss.
3Reliability
If an overhang portion is formed to maintain sealing properties, then close contact properties are improved, but the intake air flow path narrows
Solution Approach 1:
The overhang portion is divided into a first overhang portion on a first side and a second overhang portion on a second side, with different heights optimized for their respective functions. The first overhang portion maintains close contact properties for sealing, while the second overhang portion minimizes flow path narrowing.
Solution Approach 2:
Different regions of the seal surface are given different local overhang characteristics. The first side has a first overhang portion with a first height that ensures proper sealing contact, while the second side has a second overhang portion with a second height that preserves flow path area. This local quality approach resolves the contradiction between sealing and flow area.
Data Source
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AI summary
An intake device (100) includes: an intake port (2); a valve body (5) which is disposed in the intake port and rotated around a rotating shaft (31) between an opening position and a closing position; and a seal surface (26) which is integrally provided at the intake port and made up of an inner wall surface (25) with which the valve body comes into contact at the closing position of the valve body, wherein the seal surface includes a first seal surface (27) having an inner contact portion (27a) which protrudes to the inside of the intake port and a first outer contact portion (27b) which is located further to the outside than the inner contact portion, and a second seal surface (29) having a second outer contact portion (27b) without having the inner contact portion.