Bracket Press-Fit Grooves for Compact Vibration Proofing Retention
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Solution Overview
Problem
Conventional vibration proofing devices face challenges in achieving a compact configuration while maintaining sufficient retaining force between the bracket and the vibration proofing member, often due to increased heights and uneven press-fit surfaces which can lead to unstable retention of the vibration proofing member.
Innovation Solution
The vibration proofing device features a bracket with internal surfaces that have a consistent distance between facing-each-other surfaces, forming press-fit grooves and surfaces that allow the vibration proofing member to be caught by elastic reaction forces from both sides, reducing the risk of removal forces and enabling stable retention with reduced contact areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the heights of the press-fit surfaces of the bracket for a vehicle body are increased to increase areas of the bracket pressed against the vibration proofing member, then the retaining force between the bracket and the vibration proofing member is improved, but the height of the device is increased
Solution Approach 1:
The invention transitions from increasing height in the vertical direction to utilizing the horizontal direction by forming press-fit grooves that extend laterally. The grooves create retaining force through lateral elastic reaction forces rather than vertical height, effectively changing the dimensional approach to solving the retaining force problem.
Solution Approach 2:
The press-fit grooves are formed with curved surfaces that provide elastic reaction forces. The groove surfaces are designed to elastically deform and generate restoring forces that retain the vibration proofing member, replacing the need for increased vertical height with curved geometric features.
2Ease of manufacture
If the inner surface of the bracket is formed with a draft angle to allow smooth mold release, then the ease of manufacture is improved, but the elastic reaction force has a component opposite to the insertion direction causing unstable retention
Solution Approach 1:
The inner surface of the bracket is segmented into distinct functional zones: a draft angle portion for mold release and a press-fit groove portion for retention. This segmentation allows each zone to perform its specific function without interfering with the other, resolving the conflict between manufacturability and retention stability.
Solution Approach 2:
Different portions of the inner surface are given different geometric properties: the upper portion has a draft angle for easy manufacturing, while the lower portion has a press-fit groove with vertical or inwardly inclined sides for stable retention. Each local region is optimized for its specific function.
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
This configuration allows for a compact design while securing the retaining force between the bracket and the vibration proofing member, preventing removal forces and ensuring stable retention, even with reduced contact areas.
Implementation Method 1
the vibration proofing member receives elastic reaction forces from the pair of facing-each-other surfaces of the bracket
Implementation Method 2
a force in the removal direction is always applied by the elastic reaction force to the vibration proofing member, to have a risk that the vibration proofing member could not be stably retained inside the bracket
Data Source
AI summary
A vibration proofing device includes a bracket having an internal space, and a vibration proofing member inserted into the internal space. The internal space is open on an outer surface of the bracket. At least a pair of facing-each-other surfaces, against which the vibration proofing member is pressed, is formed in an inner surface of the bracket. A distance between the pair of the facing-each-other surfaces on a far side in an insertion direction of the vibration proofing member is the same, in at least some regions of the bracket, as that on a near side in the insertion direction. This provides the vibration proofing device and the bracket to allow for compactly configuring the device as a whole, while sufficiently securing a retaining force between the bracket and the vibration proofing member.