Vehicle Seat Back Mounting Structure With Elastic Pin Guidance
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Solution Overview
Problem
The existing seat back mounting structures in vehicles face challenges in assembly stability during mounting and driving stability post-assembly, with a tendency for hinge brackets to deform during collision tests, leading to passenger safety concerns and uncomfortable assembly operations.
Innovation Solution
A seat back mounting structure featuring a side pin, a seat back bracket with an insertion hole and guide route, an elastic bracket with a protruded portion, and a reinforcement plate, which allows the side pin to move elastically and securely engage with the fixation hole, enhancing stability and reducing the risk of separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hinge bracket is applied to the central part and side part of the rear seat, then the seat back strength is improved, but the bracket deforms severely during collision tests affecting passenger safety
Solution Approach 1:
The seat back mounting structure is divided into multiple independent components: side pins, seat back brackets, elastic brackets, and reinforcement plates. This segmentation allows each component to bear specific loads and deformations, preventing catastrophic failure of the entire hinge bracket system during collisions.
Solution Approach 2:
Elastic brackets are installed at the mounting locations to provide beforehand cushioning. These elastic components absorb impact energy during collisions before it reaches the rigid seat back bracket, preventing severe deformation and maintaining passenger safety while preserving seat back strength.
2Reliability
If a seat back is assembled through a side hinge bracket and center hinge bracket, then the seat back is securely mounted, but the operator has to lift the seat and match bolt assemble holes making the operation uncomfortable and stability deteriorated
Solution Approach 1:
The side pins are pre-installed on the seat back frame, and the elastic brackets are pre-mounted on the vehicle body before the actual assembly operation. This preliminary preparation eliminates the need for operators to lift and position heavy seat components while aligning multiple bolt holes, significantly improving assembly comfort and stability.
Solution Approach 2:
Guide routes are designed as intermediary features that automatically guide the side pins into the correct positions on the seat back brackets. This intermediary guidance mechanism eliminates the need for manual alignment of bolt holes, making the assembly operation easier and more stable.
3Reliability
If the guide route interior diameter is reduced to prevent side pin separation, then the engagement security is improved, but the assembly stability during mounting is deteriorated
Solution Approach 1:
The elastic bracket provides dynamic adaptability to the guide route dimensions. During assembly, the elastic material allows the guide route to expand temporarily, enabling smooth insertion of the side pin. After assembly, the elastic bracket returns to its original shape, reducing the guide route diameter to prevent side pin separation, thus achieving both assembly stability and engagement security.
Solution Approach 2:
The interior diameter of the guide route changes based on the assembly state. During assembly, the elastic bracket allows a larger effective diameter for easy insertion. After assembly, the elastic bracket maintains a smaller diameter to secure the side pin. This parameter change resolves the contradiction between assembly stability and engagement security.
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 solution improves assembly and driving stability by ensuring secure engagement of the side pin, reducing deformation risks, and enhancing passenger safety while maintaining cost-effectiveness and productivity.
Implementation Method 1
a protruded portion formed at a central portion of the elastic bracket, the protruded portion reducing a width of the guide route and elastically deformed by the side pin when the side pin moves from the insertion hole to the fixation hole
Implementation Method 2
A first burring portion and a second burring portion may be respectively formed on an interior side of the guide route and the fixation hole, and they are plastically deformed by the side pin, when they are engaged with the side pin
Data Source
AI summary
A seat back mounting structure of a vehicle body may include a side pin that is fixed on a seat back frame, a seat back bracket formed with an insertion hole through which the side pin is inserted, a fixation hole, and a guide route between the insertion hole and the fixation hole such that the side pin moves from the insertion hole to the fixation hole, and an elastic bracket including a fixation portion formed at one side thereof, the fixation portion being fixed on the seat back bracket, and a protruded portion formed at a central portion of the elastic bracket, the protruded portion reducing a width of the guide route and elastically deformed by the side pin when the side pin moves from the insertion hole to the fixation hole.