Vehicle Seat Back Frame Bracket Welding
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Solution Overview
Problem
The existing back frame designs for vehicle seats face challenges in improving manufacturing productivity due to variations in the longitudinal size of cylindrical bars, parallelism issues, and thermal deformation during welding, which affect welding accuracy and productivity.
Innovation Solution
The proposed back frame configuration includes a frame main body, a rod-like beam member, and a bracket with an extending portion that is welded to the beam member's outer surface, allowing the extending portion to inhibit thermal deformation and ensure secure coupling, regardless of the beam member's size or parallelism, thereby improving manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cylindrical bar is welded to the frame main body with end surfaces abutting inner sides, then the structure is simple, but welding productivity and accuracy are greatly affected by size variations and parallelism issues
Solution Approach 1:
The patent introduces a positioning member as an intermediary component between the cylindrical bar and the frame main body. This positioning member pre-positions the cylindrical bar, ensuring accurate alignment and consistent spacing before welding occurs. By mediating the connection, the positioning member eliminates the need for precise manual alignment during welding, thereby improving welding productivity while maintaining structural simplicity.
2Device complexity
If a cylindrical bar is welded to the frame main body with end surfaces abutting inner sides, then the structure is simple, but welding accuracy is greatly affected by size variations and parallelism issues
Solution Approach 1:
The positioning member serves as a mediator that ensures consistent positioning of the cylindrical bar relative to the frame main body. It compensates for variations in cylindrical bar dimensions and parallelism by providing a standardized reference surface, thereby improving welding accuracy without complicating the overall structure.
Solution Approach 2:
The positioning member performs preliminary positioning of the cylindrical bar before the welding process begins. By pre-establishing the correct position and orientation, it eliminates the need for precise alignment during welding, thereby improving welding accuracy while maintaining structural simplicity.
3Adaptability or versatility
If the bracket is welded to the outer circumferential surface of the beam member, then assembly is flexible, but thermal deformation occurs during welding causing displacement
Solution Approach 1:
The positioning member acts as a thermal barrier and mechanical constraint during the welding process. It absorbs and distributes the thermal stress, preventing excessive thermal deformation of the bracket. By serving as a mediator between the heat source and the bracket, it maintains welding accuracy while allowing assembly flexibility.
Solution Approach 2:
The positioning member provides beforehand cushioning against thermal deformation by being in close proximity to the welding zone. It absorbs and distributes the thermal stress before it can cause significant displacement of the bracket, thereby maintaining welding accuracy while preserving assembly flexibility.
4Manufacturing precision
If the extending portion is provided in the bracket end, then thermal deformation is inhibited, but the bracket structure becomes more complex
Solution Approach 1:
The extending portion adds a new dimensional element to the bracket structure, extending in a direction away from the end of the bracket. This additional dimension provides a thermal barrier and structural reinforcement that inhibits thermal deformation during welding, while the extension is designed to be minimal and integrated, thus not significantly increasing overall complexity.
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 manufacturing productivity by minimizing the impact of size variations and thermal deformation, ensuring accurate and secure attachment of the beam member to the frame main body, and maintaining stability during welding.
Implementation Method 1
The bracket comprises a welded portion in the end of the bracket, and the welded portion is welded to an outer circumferential surface of the beam member
Implementation Method 2
the bracket may be deformed by heat at the time of welding
Data Source
AI summary
A back frame to be used in a seatback of a vehicle seat is provided. The back frame for a vehicle seat includes a frame main body, a beam member, a bracket, and an extending portion. The frame main body includes two side frames that extend in an approximately up-down direction and that are disposed spaced apart from each other in a seat width direction. The beam member is formed in a rod-like shape, is disposed between the two side frames, and extends in the seat width direction. The bracket couples the beam member to the frame main body. The extending portion is provided in an end of the bracket and extends in a direction away from the end of the bracket. The bracket includes, in the end thereof, a welded portion welded to an outer circumferential surface of the beam member.