Motor Vehicle Shock Crossmember Pre-holding Mounting
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Solution Overview
Problem
The existing mounting conditions of an impact cross member on a transverse wall in motor vehicles are unsatisfactory, making it difficult to correctly position and maintain the cross member prior to final fixing, leading to inefficiencies in assembly time and cost, as well as ergonomics.
Innovation Solution
A structural sub-assembly with end plates fixed to the transverse wall using multiple screws and weldnuts, including a pre-holding mechanism with a welding screw and a pre-holding hook to ensure accurate positioning and pre-maintenance of the impact cross member, allowing for easier and effective assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the impact cross member is mounted directly to the transverse wall without pre-holding mechanisms, then the structure is simpler, but the cross member is difficult to position and maintain correctly prior to final fixing
Solution Approach 1:
The patent implements pre-holding means (protrusions and recesses) that enable preliminary positioning and temporary fixation of the impact cross member before final tightening. This allows the cross member to be correctly positioned and maintained during assembly operations, resolving the contradiction between ease of operation and device complexity by adding only the necessary minimal structural elements for pre-positioning.
Solution Approach 2:
The end plates serve as intermediary elements between the impact cross member and the transverse wall. These plates incorporate pre-holding means that facilitate positioning and temporary fixation, acting as mediators that simplify the mounting operation while maintaining structural integrity during the assembly process.
2Strength
If multiple fixing screws and weldnuts are used to secure the end plates, then the connection strength is improved, but the assembly time and cost increase
Solution Approach 1:
The pre-holding means enable preliminary fixation of the end plates to the transverse wall before final tightening of all fixing screws. This preliminary action secures the structural assembly in position, allowing subsequent assembly operations to proceed efficiently without compromising connection strength, thereby reducing overall assembly time and cost.
Solution Approach 2:
The mounting process is segmented into preliminary fixation using pre-holding means and final tightening using multiple fixing screws. This segmentation allows the assembly to be secured in position quickly, with the remaining fastening operations being performed systematically, improving productivity while maintaining the required connection strength.
3Manufacturing precision
If the cross member is held firmly against the transverse wall during assembly, then positioning accuracy is improved, but the complexity of the pre-holding mechanism increases
Solution Approach 1:
The pre-holding means (protrusions fitting into recesses) provide preliminary positioning and firm holding of the impact cross member against the transverse wall. This preliminary action ensures correct positioning accuracy is achieved and maintained during assembly operations, with the mechanism remaining relatively simple in structure.
Solution Approach 2:
The end plates act as intermediary elements that incorporate simple pre-holding means (protrusions and recesses). These intermediaries provide firm holding and precise positioning of the cross member while keeping the pre-holding mechanism itself simple in design, avoiding unnecessary complexity.
Data Source
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AI summary
The invention relates to a structural sub-assembly of a motor vehicle, comprising a shock crossmember (1) extending along the transverse direction (Y) of the vehicle, connected at each of its ends to a substantially vertical transverse wall (2) of the vehicle structure by means of a corresponding shock absorber (3; 4) extending along the longitudinal direction (X) of the vehicle.A first absorber (3) located at a first end of the cross member (1) has a first end plate (5) having a pre-holding hole (9) threaded onto a weld screw (10) attached to the transverse wall (2) while a second absorber (4) located at a second end of the cross member (1) has a second end plate (6) having an edge (11) cooperating with a pre-holding hook (12) located on the transverse wall (2), the end plates (5; 6) being further fixed to the transverse wall (2) by a plurality of fixing screws (13; 15).