Conveyance Seat Frame Assembly Using Integrated Engagement Features
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Solution Overview
Problem
The existing vehicle seat assembly process is inefficient due to complex frame connections and a high number of components, leading to increased man-hours and potential inaccuracies in positioning and fastening.
Innovation Solution
A conveyance seat design featuring side frames with engaging protrusions and recesses that facilitate easy positioning and alignment of connecting frames, reducing the number of components and streamlining the assembly process by allowing for simpler and more accurate engagement mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pan frame is connected to the right and left side frames using traditional fastening rivets with both end portions in contact, then the connection is stable, but the assembly work requires more man-hours and position adjustment is difficult
Solution Approach 1:
The pan frame is divided into multiple frame members with engaging portions at their ends. Each frame member has engaging portions that can engage with corresponding engaged portions on side frames, allowing for modular assembly and easier positioning during assembly work.
Solution Approach 2:
Engaging portions and engaged portions serve as intermediary elements between frame members and side frames. These engagement features facilitate easier connection and positioning, reducing the need for complex fastening operations and manual position adjustment.
2Reliability
If multiple components are used for frame connection, then the connection reliability is high, but the number of components increases and assembly work becomes more complex
Solution Approach 1:
The engaging portions and engaged portions are integrated directly into the frame members and side frames, eliminating the need for separate fastening components. This merging of connection features into the structural members themselves reduces component count while maintaining connection reliability through the engagement mechanism.
Solution Approach 2:
The frame members serve multiple functions: they provide structural support and simultaneously incorporate engaging portions that enable connection to side frames. This multi-functionality reduces the need for separate connection components, simplifying the overall assembly while maintaining reliability.
3Manufacturing precision
If traditional fastening methods are used, then the connection is secure, but positioning accuracy may vary and assembly precision is reduced
Solution Approach 1:
Engaging portions are formed in advance on frame members at predetermined positions. These pre-formed engagement features guide the assembly process by providing fixed reference points for connection, ensuring consistent positioning accuracy without requiring complex adjustment operations during assembly.
Data Source
AI summary
A conveyance seat includes a cushion frame. The cushion frame includes side frames disposed on right and left sides in a seat width direction, and a pan frame (connecting frame) connecting the right and left side frames. The side frames includes respective engagement protrusions (engaging portions) that engage with engagement recesses (engaged portions) provided in the pan frame, to position the pan frame. The engagement protrusions are formed to protrude toward an engagement recess side in a facing direction (up to down direction) in which the side frames and the pan frame face each other. The engagement recesses engage with the respective engagement protrusions by coming into contact with the respective engagement protrusions in an intersecting direction intersecting with the facing direction.