Vehicular Bracket with Convex Cross-Section and Non-Linear Connectors
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Solution Overview
Problem
Conventional methods for securing air compressors to vehicle bodies often result in reduced natural frequency of brackets, leading to amplified vibration transmission, and increasing rigidity through thicker materials increases weight, while adding vibration-isolating members complicates the mounting process and increases costs.
Innovation Solution
A vehicular pump apparatus with an annular bracket featuring a convex cross-sectional shape and non-linear connecting portions, which increases the moment of inertia and flexural rigidity without adding weight, thereby suppressing vibration transmission to the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the bracket is increased to increase rigidity, then the natural frequency increases and vibration transmission is suppressed, but the weight of the bracket increases
Solution Approach 1:
The bracket transitions from a planar plate structure to a three-dimensional structure with convex portions projecting in the thickness direction. This dimensional change increases the moment of inertia and flexural rigidity without increasing the planar footprint, effectively raising the natural frequency while maintaining acceptable weight levels.
Solution Approach 2:
The connecting portions between the annular portion and vehicle body mounting portions are designed with non-linear curved shapes rather than straight lines. This curvature increases the structural rigidity by creating more efficient load paths and increasing the moment of inertia, thereby suppressing vibration transmission without requiring increased material thickness.
2Device complexity
If a plate-shaped bracket is used to secure the air compressor when space is limited, then the mounting is simplified, but the natural frequency decreases and vibration transmission is amplified
Solution Approach 1:
The bracket incorporates convex portions that project in the thickness direction of the plate, transforming it from a simple planar structure to a three-dimensional structure. This dimensional enhancement increases the moment of inertia and flexural rigidity, raising the natural frequency above the pump's vibration frequency to prevent resonance and amplified vibration transmission.
Solution Approach 2:
The connecting portions are designed with non-linear curved geometries instead of straight lines. This curvature creates more efficient structural load paths and increases the moment of inertia, thereby enhancing vibration suppression capabilities while maintaining the simplified plate-shaped mounting structure.
3Object-affected harmful factors
If vibration-isolating members are added to the mounting regions, then vibration transmission is reduced, but the number of parts increases and manufacturing cost increases
Solution Approach 1:
The vibration suppression function is merged into the bracket structure itself through the convex portions and non-linear connecting portions. This integration eliminates the need for separate vibration-isolating members, reducing the number of parts while maintaining effective vibration transmission suppression.
Solution Approach 2:
The bracket structure itself provides vibration suppression functionality through its geometric design features (convex portions and non-linear connecting portions). The structure serves dual purposes: mounting the pump and suppressing vibration, eliminating the need for additional dedicated vibration isolation components.
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 solution effectively raises the natural frequency of the bracket, reduces vibration transmission, and simplifies the mounting process by eliminating the need for additional vibration-isolating members, thus lowering manufacturing costs.
Implementation Method 1
The annular portion of the bracket has a convex portion of convex cross-sectional shape provided along the annular portion
Implementation Method 2
a connecting portion between each of the vehicle body mounting portions and the annular portion has a non-linear shape
Data Source
AI summary
A bracket (11) has an annular portion (12) provided with a trapezoidal convex portion (13) extending from an inner peripheral edge (12C) to outer peripheral edge (12D) of the annular portion. The convex portion has a top region (13A), an outer wall-side falling region (13B), and an inner wall-side falling region (13C). The annular portion and one vehicle body mounting portion (17) are connected to each other through a non-linear connecting portion (20), and the annular portion and the other vehicle body mounting portion (18) are connected to each other through a non-linear connecting portion (21). This structure makes it possible to increase the moment of inertia of area of the annular portion and to increase the flexural rigidity of the bracket. Further, it is possible to suppress a problem that the connecting portion (20) and the connecting portion (21) become nodes of vibration.