I-Section Antivibration Bracket for Lower Weight and Durability
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Solution Overview
Problem
Conventional brackets for anti-vibration devices face a challenge in achieving both durability and weight reduction simultaneously.
Innovation Solution
A bracket design featuring a synthetic resin body with a reinforcement member made of fiber-reinforced plastic, where the reinforcement member arrangement portion is shaped like a letter I in cross section, with a narrower connecting portion and a convex inner circumference, and includes a recess to alleviate stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reinforcement member made of fiber reinforced plastic is fixed to an outer circumference of a surrounding portion of a bracket body made of synthetic resin, then durability is improved, but weight reduction is limited
Solution Approach 1:
The patent applies local quality by creating an I-shaped cross-section in the reinforcement member arrangement portion, where the connecting portion has a narrower cross-sectional width than the outer and inner circumferences. This localized structural optimization allows weight reduction in the connecting portion while maintaining durability at the outer and inner circumferences where reinforcement is most needed.
Solution Approach 2:
The patent uses composite materials by combining a synthetic resin bracket body with a fiber reinforced plastic reinforcement member. The fiber reinforced plastic provides enhanced durability and strength, while the overall I-shaped design optimizes the weight-strength ratio by strategically placing material where it is most effective.
2Weight of stationary object
If the cross sectional width of the connecting portion is reduced to narrow the I-shape, then weight is reduced, but structural strength may be compromised
Solution Approach 1:
The patent applies local quality by creating an I-shaped cross-section in the reinforcement member arrangement portion, where the connecting portion has a narrower cross-sectional width than the outer and inner circumferences. This localized structural optimization allows weight reduction in the connecting portion while maintaining durability at the outer and inner circumferences where reinforcement is most needed.
3Reliability
If the inner circumferential-side surface is formed with a convex outline to improve durability, then stress concentration is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies spheroidality by forming the inner circumferential-side surface with a convex outline that includes an outwardly convex curve. This curved geometry eliminates sharp corners and edges that would cause stress concentration, thereby improving durability. The convex shape distributes stress more evenly across the surface, preventing crack initiation and propagation.
Data Source
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AI summary
A bracket (1) includes a bracket body (2) made of a synthetic resin and a reinforcement member (3) made of a fiber reinforced plastic. The bracket body (2) has a surrounding portion (20). The reinforcement member (3) extends in a surrounding direction. A reinforcement member arrangement portion (20a) of the surrounding portion (20) is formed of an outer circumference (211), an inner circumference (212), and a connecting portion (213). The reinforcement member arrangement portion (20a) is in the shape of a letter I in cross section in which the cross sectional width (W3) of the connecting portion (213) is narrower than the cross sectional width (W1) of the outer circumference (211) and the cross sectional width (W2) of the inner circumference (212). The reinforcement member (3) is arranged on the outer circumference (211).