Vehicle Subframe Center Cross Assembly for Side Member Stiffness
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Solution Overview
Problem
The existing subframe assembly methods in vehicles do not adequately reinforce the stiffness and durability of the side members, which are crucial for supporting the body and ensuring structural integrity.
Innovation Solution
A center cross reinforcing member is assembled between the front and rear cross members, with side assembling parts fixed to the side members and a center assembling part positioned between them, restricting movement in the third-axis direction, and bonded through welding, expanding the contact area and increasing fixing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple assembly structure is used for the subframe, then the ease of manufacture is improved, but the stiffness and durability of the side members deteriorate
Solution Approach 1:
The center cross reinforcing member is divided into multiple assembling parts (first assembling part, second assembling part, and third assembling part) that can be manufactured separately and then assembled together. This segmentation allows each part to be optimized for manufacturing while the combined structure provides enhanced stiffness and durability to the side members.
2Strength
If the contact area between assembling parts is increased, then the fixing strength is improved, but the device complexity increases
Solution Approach 1:
The third assembling part is inserted into the first assembling part in a surrounded shape, creating a nested configuration. This nesting structure increases the contact area between assembling parts for enhanced fixing strength while maintaining a relatively simple overall device structure that does not require complex assembly procedures.
3Strength
If welding is applied along the boundary of inserting parts, then the fixing forces are increased, but the manufacturing precision requirements increase
Solution Approach 1:
The insertion groove is pre-formed in the first assembling part with a closed cross-sectional shape, and the third assembling part is pre-shaped to fit into it. This preliminary preparation of the insertion groove and surrounding shape ensures proper alignment and contact before welding is applied along the boundary, reducing the precision requirements during the welding process itself.
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
This configuration enhances the fixing strength of the center cross reinforcing member, thereby increasing the stiffness and durability of the subframe by physically restricting movements and expanding the welding area between assembling parts.
Implementation Method 1
The assembling part and the other assembling part may be bonded by welding along a boundary in which the assembling part and the other assembling part are in contact with each other
Data Source
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AI summary
The present invention relates to a body for a vehicle fixed between side members to reinforce the stiffness and durability of a subframe, and in the present invention, disclosed is a body for a vehicle including a subframe in which front and rear cross members are provided in a width direction of the vehicle and side members are provided at both sides of the front and rear cross members in a longitudinal direction of the vehicle, and a center cross reinforcing member assembled in a structure in which a plurality of assembling parts are assembled between the front and rear cross members in the width direction of the vehicle and fixed to the side members positioned at both sides and movements between the assembling parts in a third-axis direction are restricted.