Mounting structure for electric device

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Solution Overview

Problem

Conventional mounting structures for electrical devices in vehicles allow displacement of the device towards the rear during a front collision, potentially causing excessive collision loads to adjacent devices.

Innovation Solution

A mounting structure that includes a supporting member with a body portion and front extension portions, where the front extension portions have lower rigidity than the body portion, absorbing collision loads and preventing displacement of the electrical device during a front collision.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the electrical device is rigidly mounted to the vehicle body floor, then the electrical device is firmly fixed under normal conditions, but during a front collision the electrical device cannot absorb the collision load and displaces toward the rear side

Engineering Contradiction:

Improvefirm fixation of electrical deviceVSAvoiddisplacement suppression during collision

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The supporting member is divided into a body portion and front extension portions with different rigidity characteristics. The body portion maintains firm fixation under normal conditions, while the front extension portions provide controlled flexibility during collision to absorb loads and prevent displacement of the electrical device.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the supporting member are designed with different rigidity properties. The body portion has high rigidity for stable mounting, while the front extension portions have lower rigidity to absorb collision forces. This local differentiation allows the structure to simultaneously achieve firm fixation and collision load absorption.

Inventive Principle:

Principle #3Local quality

2Strength

If the supporting member has high rigidity throughout, then the electrical device is firmly fixed, but the collision load is transmitted to adjacent devices causing excessive loads

Engineering Contradiction:

Improvefixation strength of supporting memberVSAvoidexcessive collision load on adjacent devices

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The supporting member features local quality differentiation where the body portion maintains high strength for firm fixation, while the front extension portions have reduced rigidity to serve as load-absorbing elements. This allows the structure to protect adjacent devices from excessive collision loads while maintaining strong fixation.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The front extension portions act as intermediary elements between the electrical device and the collision load. These portions absorb and dissipate collision forces before they can be transmitted to the electrical device and adjacent components, serving as a protective buffer zone.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the front extension portions have lower rigidity, then collision loads are absorbed effectively, but the supporting member becomes more complex in structure

Engineering Contradiction:

Improvecollision load absorptionVSAvoidstructure complexity of supporting member

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The supporting member is segmented into functionally distinct portions: a body portion for structural support and front extension portions for collision load absorption. This segmentation allows each portion to be optimized for its specific function while maintaining an overall integrated structure that is relatively simple to manufacture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The rigidity parameter of the supporting member is changed locally in the front extension portions compared to the body portion. This parameter differentiation achieves effective collision load absorption while maintaining structural simplicity through controlled geometric and material property variations.

Inventive Principle:

Principle #35Parameter changes

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 structure effectively suppresses the displacement of electrical devices towards the rear, reducing excessive loads on adjacent devices by absorbing collision forces and enhancing stability during vehicle collisions.

Implementation Method 1

a rigidity of the front extension portion (40) in a vehicle front-rear direction is lower than a rigidity of the body portion (30) in the vehicle front-rear direction

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentEP4446146B1Mounting structure for electric device

Publication Date: 2026.01.21 NISSAN MOTOR CO LTD

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AI summary

A mounting structure for an electrical device includes: a vehicle electrical device (10); and a supporting member (20) which supports the electrical device (10). The supporting member (20) includes: a body portion (30) to which the electrical device (10) is supported and fixed; and a front extension portion (40) extending from the body portion (30) toward a vehicle front side further than an end portion (11) of the electrical device (10) at a vehicle front side. The body portion (30) and an end portion (41) of the front extension portion (40) at the vehicle front side are fixed to the vehicle body floor (1), and a rigidity of the front extension portion (40) in a vehicle front-rear direction is lower than a rigidity of the body portion (30) in the vehicle front-rear direction.