Vehicle Suspension Tower Fastening Rigidity

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Solution Overview

Problem

The existing suspension tower portion structures experience local stress concentration at the fastening portion due to non-uniform rigidity around the fastening area, leading to inconsistent stress distribution under vertical loads.

Innovation Solution

The suspension tower portion structure incorporates fastening-portion surrounding wall portions spaced uniformly from the fastening seat, with features like arc-shaped wall portions and outer-peripheral ribs to enhance rigidity, and triangularly positioned connecting wall portions to create a truss structure effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If radial-shaped ribs are provided on the fastening face portion, then the rigidity of the upper face portion is improved, but the distance between the peripheral portion of the fastening seat portion and the radial-shaped rib becomes non-constant, causing local stress concentration

Engineering Contradiction:

Improverigidity of upper face portionVSAvoidstress concentration at fastening portion

Core Design Contradiction:

StrengthVSStress or pressure

Solution Approach 1:

The patent introduces fastening-portion surrounding wall portions with uniform spacing around the fastening seat portion, creating a localized structural feature that specifically addresses the stress concentration problem at the fastening area without affecting other regions of the upper face portion

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The upper face portion is segmented into multiple functional zones: the fastening face portion with uniformly spaced fastening-portion surrounding wall portions, and the top face portion connected via ring-shaped ribs. This segmentation allows each zone to independently address specific requirements - uniform stress distribution at fastening points and overall structural rigidity

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If fastening portions are provided on the outer-peripheral side of the ring-shaped rib, then the suspension can be fastened to the suspension tower portion, but the non-uniform distance to radial-shaped ribs causes inconsistent rigidity around the fastening portion

Engineering Contradiction:

Improvefastening capabilityVSAvoiduniformity of rigidity around fastening portion

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The fastening-portion surrounding wall portions are positioned at constant distances from the fastening seat portion in all directions, creating an equipotential distribution of rigidity around the fastening area. This ensures that stress is evenly distributed across the fastening portion regardless of the direction of load application

Inventive Principle:

Principle #12Equipotentiality

Data Source

PatentUS9878742B2Suspension tower portion structure of vehicle

Publication Date: 2018.01.30 MAZDA MOTOR CORP

AI summary

A suspension tower portion structure of a vehicle is configured such that an upper face portion of a suspension tower portion comprises an fastening face portion where plural fastening portions to which an upper-side attached portion of a suspension is fixedly fastened are provided, plural arc-shaped wall portions which are each provided to rise around the fastening portion are provided on the fastening face portion, and the arc-shaped wall portion is configured to be spaced apart from a fastening seat portion of a fastening member to be fastened to the fastening portion 11, having a constant distance therebetween.