Underframe Reinforcement for Passenger Car Body Strength

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Solution Overview

Problem

Passenger cars with a double rear axle structure have low strength, poor safety performance, and are heavy, leading to increased energy consumption and transportation costs.

Innovation Solution

A full-load passenger car body structure is designed with a roof frame, side wall frame, rear frame, and underframe, where the underframe is divided into sections with reinforcing members to enhance connection strength and support the roof and side wall frames.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a girder structure is used for the underframe, then the structural strength is improved, but the weight of the vehicle increases

Engineering Contradiction:

Improvestructural strengthVSAvoidvehicle weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The underframe is divided into multiple sections (front section area, front axle area, middle section area, rear axle area) with reinforcing members strategically placed at critical locations such as joints between transverse beams and main longitudinal beams. This segmentation approach allows strength to be concentrated where needed rather than uniformly distributed, reducing overall weight while maintaining structural integrity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reinforcing members are disposed at specific critical locations including joints between transverse beams and main longitudinal beams, and at connection points between the underframe and body frame. This local reinforcement provides targeted strength enhancement only where structural demands are highest, avoiding the weight penalty of a uniformly heavy girder structure.

Inventive Principle:

Principle #3Local quality

2Strength

If a girder structure is used for the underframe, then the structural strength is improved, but the energy consumption increases

Engineering Contradiction:

Improvestructural strengthVSAvoidenergy consumption

Core Design Contradiction:

StrengthVSUse of energy by moving object

Solution Approach 1:

The underframe is divided into multiple sections with reinforcing members strategically placed at critical locations. This segmentation reduces the total amount of material required compared to a full girder structure, directly reducing vehicle weight and consequently lowering energy consumption during operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reinforcing members are disposed at specific critical locations rather than uniformly throughout the structure. This local reinforcement approach minimizes material usage while maintaining necessary strength, thereby reducing vehicle weight and energy consumption.

Inventive Principle:

Principle #3Local quality

3Strength

If a girder structure is used for the underframe, then the structural strength is improved, but the transportation cost increases

Engineering Contradiction:

Improvestructural strengthVSAvoidtransportation cost

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The underframe is divided into modular sections that can be manufactured separately and assembled. This segmentation enables more efficient production and transportation of individual components, reducing manufacturing complexity and transportation costs compared to moving and assembling a complete heavy girder structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reinforcing members are disposed at specific critical locations rather than uniformly throughout the structure. This local reinforcement approach minimizes material usage and overall structure weight, reducing both manufacturing material costs and transportation costs.

Inventive Principle:

Principle #3Local quality

4Strength

If reinforcing members are disposed at critical locations, then the connection strength is improved, but the device complexity increases

Engineering Contradiction:

Improveconnection strengthVSAvoidstructure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The underframe is divided into standardized sections (front section area, front axle area, middle section area, rear axle area) with reinforcing members placed at predetermined critical locations. This segmentation with standardized reinforcement patterns maintains connection strength while managing structural complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12280834B2Full-load passenger car body structure

Publication Date: 2025.04.22 NEXTGEN EXCHANGE GRP INC

AI summary

The present disclosure relates to a full-load passenger car body structure including a roof frame, a side wall frame, a rear frame and an underframe. The side wall frame is enclosed to form an accommodating space, the roof frame is disposed on an upper part of the side wall frame, and the underframe is disposed on a lower part of the side wall frame, where a plurality of reinforcing members are disposed on the underframe and used for reinforcing connection strength of the underframe. Therefore, the connection strength of the underframe is reinforced by disposing the plurality of reinforcing members on the underframe, thereby increasing the strength of the full-load passenger car body structure, and the structure is simple and light without reinforcement, so that the overall weight of the full-load passenger car body structure can be reduced while meeting the requirements for carrying capacity of the underframe.