Intake Manifold Water Prevention via Nested Recess and Projection
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Solution Overview
Problem
Existing waterproof constructions in internal combustion engine intake devices either increase passage resistance or raise production costs, as they either project into the intake passage or require complex recessed portions to prevent water from entering negative pressure outlet ports, hindering intake efficiency and increasing costs.
Innovation Solution
A design featuring a recessed portion on the lower passage wall with a negative pressure outlet port and a projecting portion from the upper passage wall that extends into the recessed portion, positioned between the outlet port and the inner surface, which guides water drops away from the outlet port and reduces passage resistance by accommodating the projecting portion within the recessed area, thus minimizing the need for complex structures and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a projecting portion is provided on the inner surface of passage walls to prevent water drops from entering the negative pressure outlet port, then water prevention effect is improved, but passage resistance increases and intake efficiency is lowered
Solution Approach 1:
The projecting portion is nested within a recessed portion formed in the passage wall. The recessed portion receives the projecting portion, allowing the water prevention structure to be contained within the wall thickness rather than protruding into the intake passage, thereby maintaining intake efficiency while preventing water entry
2Productivity
If a recessed portion is provided on the inner surface of passage walls to suppress passage resistance increase, then intake efficiency is improved, but device complexity increases and production costs rise
Solution Approach 1:
The recessed portion and projecting portion are merged into a single integrated structure formed in the passage wall. The recessed portion is formed directly in the wall, and the projecting portion extends from it, combining multiple functions (water prevention and flow management) into one unified component that simplifies manufacturing
Data Source
AI summary
An intake passage is formed by connecting an upper case 10 and a lower case 20 of an intake manifold. The lower case 10 has a recessed portion 50 on part of an inner surface 17a of a side wall 17. The recessed portion 50 has a deep surface 53 to which a negative pressure outlet port 42 opens, and an opening 51 opened upwards is provided in an upper portion of the recessed portion 50 in a position which opposes to the upper case 20 in a vertical direction A0. The upper case 20 has a projecting portion 60 which extends further downwards towards the negative pressure outlet port 42 than mating surfaces 10a, 20a and projects into the recessed portion 50 through an opening 52. The projecting portion 60 is positioned between the negative pressure outlet port 42 and the inner surface 17a in a horizontal direction A1.