Lower body structure of vehicle

By adding reinforcing components at the edges of the crossbeam and designing slots at the vulnerable parts of the bracket, the problem of battery cell collision caused by stress concentration in the crossbeam is solved, thus achieving the stability of the crossbeam and the protection of the battery cells, improving vehicle safety and ride comfort.

CN116985916BActive Publication Date: 2026-07-14MAZDA MOTOR CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
MAZDA MOTOR CORP
Filing Date
2023-02-09
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In the prior art, the increased ridges of the crossbeam cause stress concentration at the joint between the crossbeam and the side beam, making it difficult for the floor channel to collapse, which in turn leads to the problem of the vehicle body on one side of the side beam colliding with the battery cell or the battery cells on both sides colliding with each other.

Method used

Reinforcing components are installed at the edges of the crossbeam to enhance its structure and suppress cross-sectional deformation. A weak point and a soft joint with damping performance are formed in the center of the bracket to ensure that the floor passage can deform smoothly during a side collision of the vehicle, avoiding stress concentration and battery cell collision.

Benefits of technology

It effectively suppresses crossbeam deformation, improves vehicle rigidity, reduces floor vibration, prevents collisions between battery cells, improves ride comfort, and protects battery cells in the event of a side collision.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN116985916B_ABST
    Figure CN116985916B_ABST
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Abstract

The present invention aims to provide a lower vehicle body structure of a vehicle capable of suppressing deformation of a cross member section during normal driving, suppressing floor vibration due to the suppression of the cross member section deformation, and protecting battery units during a vehicle side collision, which includes a floor tunnel (2) protruding upward at a vehicle width direction central position of a floor (1) and extending in a vehicle front-rear direction, a cross member (18) having a ridge line (X3, X5) extending in the vehicle width direction at a rear end of the floor tunnel (2) and a closed cross section portion (21) connecting between left and right pairs of side members (5), left and right pairs of battery units (31, 32) located below the floor (1) and between the side members (5) and provided in the vehicle width direction left and right across the floor tunnel (2); wherein a reinforcing portion (41, 42) of the cross member (18) reinforces the ridge line (X3, X5) in the vehicle width direction at least in a range including a vehicle width direction position of the battery units (31, 32) and excluding the vehicle width direction central position.
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