Axial Flame Damper Intake Manifold Step Prevention
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Solution Overview
Problem
Conventional intake manifolds face issues with step formation on the inner wall surface due to the configuration of the flame damper fitting and holding, and the use of additional parts for radial damping leads to increased size and insufficient holding strength, particularly with the flame damper's larger specific gravity causing variations in the fitting direction and welding bond strength.
Innovation Solution
An intake manifold design that incorporates a fitting holding portion for the flame damper in the axial direction, utilizing a retaining rectifying member and an elastic holder to ensure secure abutment and prevent step formation on the inner wall surface, while maintaining a compact size and sufficient strength through vibration welding of the resin-made components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flame damper is fitted and held to abut against the annular fitting holding portion in the axial direction, then the flame damper can be securely held, but a step is easily formed on the inner wall surface of the curved intake passage due to the protruding abutting portion
Solution Approach 1:
The patent changes the fitting direction of the flame damper from the conventional radial direction to the axial direction. The flame damper is fitted into a fitting holding portion formed in the base member along the axial direction, allowing the abutting portion to abut against the fitting holding portion in the axial direction. This dimensional change enables secure holding while preventing step formation on the curved intake passage inner wall surface.
2Stability of the object's composition
If a band-shaped flame damper fixing member is used to suppress rattling in the radial direction, then radial stability is improved, but the welded joint portion becomes wider and the size of the intake manifold increases
Solution Approach 1:
The patent extracts and eliminates the additional band-shaped flame damper fixing member from the conventional structure. By fitting the flame damper into the axially-formed fitting holding portion and utilizing the abutting portion to abut in the axial direction, the invention achieves both radial and axial stability without requiring separate fixing members, thereby preventing increase in welded joint portion and overall size.
Solution Approach 2:
The patent merges the holding function and the rattling suppression function into a single integrated fitting holding portion structure. The fitting holding portion simultaneously provides axial holding through the abutting portion and radial stability through its structural design, eliminating the need for separate fixing members and reducing overall component count and size.
3Device complexity
If the flame damper is fitted radially into the base member, then the fitting structure is simple, but the holding strength is insufficient due to the flame damper's larger specific gravity causing fitting direction variations
Solution Approach 1:
The patent changes the fitting direction from radial to axial. The flame damper is fitted into the fitting holding portion along the axial direction, and the abutting portion abuts against the fitting holding portion in the axial direction. This axial fitting configuration provides more reliable holding strength to counteract the flame damper's larger specific gravity, while the integrated structure maintains relative simplicity.
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
The design effectively prevents step formation on the intake passage inner wall, enhances the holding strength of the flame damper, and reduces the size of the welded joint, ensuring reliable operation and preventing flashback and backfire in internal combustion engines.
Implementation Method 1
an elastic holder to ensure secure abutment
Implementation Method 2
vibration welding of the resin-made components
Data Source
Figure 1
Figure 2
Figure 3
AI summary
To provide an intake manifold which can reliably prevent the step from being formed in the inner wall surface of the intake passage (15) while having provided therein the fitting holding portion (32) for fitting and holding the flame arrester (25) in the axial direction, the intake manifold (10) includes a base member (21), a cover member (22) and a flame arrester (25) having a flame suppression structure. Between the flame arrester (25) and the radical stepped surface (31b) of the recessed body portion (31) is provided a retaining rectifying member (23) that prevents the flame arrester (25) from coming off with respect to the fitting holding portion (32) and forms a third inner peripheral surface (23a) continuous without a step from an opening portion on the other end side (25b) of the flame arrester (25) to the base side second inner wall surface (31c).