Vehicle Junction Box Grounding Busbar for Faster Assembly
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Solution Overview
Problem
Existing electric junction boxes for vehicles face poor workability and increased assembly steps and costs due to the need for individual grounding of ground terminals through bolt fastening to the vehicle body.
Innovation Solution
An electric junction box design featuring a joint busbar with elastic connection pieces and a conductive member that allows collective grounding of multiple ground terminals to the vehicle body, eliminating the need for individual terminal grounding and reducing assembly complexity by using elastic contact instead of bolt fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bolt fastening is used for body grounding of the circuit board, then reliable ground connection is achieved, but workability deteriorates and the number of assembling steps increases
Solution Approach 1:
Multiple ground terminals are merged into a single collective grounding structure. The circuit board includes a common ground terminal that connects all ground terminals collectively to the vehicle body through a single grounding path, eliminating the need for individual bolt fastening of each ground terminal. This merging approach maintains reliable ground connection while dramatically improving workability and reducing assembly steps.
Solution Approach 2:
The circuit board serves multiple functions: it acts as both the mounting platform for the ECU and as the grounding structure itself. The ground terminal on the circuit board is electrically connected to the vehicle body through the housing, making the circuit board a multi-functional component that eliminates the need for separate grounding mechanisms for each terminal.
2Reliability
If bolt fastening is used for body grounding, then secure electrical connection is achieved, but the number of assembling steps increases and costs increase
Solution Approach 1:
The grounding operation for multiple terminals is merged into a single assembly step. The circuit board's common ground terminal connects all ground terminals simultaneously to the vehicle body, reducing the assembly process from multiple individual grounding operations to one collective grounding action, thereby improving productivity without compromising electrical connection reliability.
Solution Approach 2:
The circuit board structure itself provides the grounding function without requiring external grounding components or complex assembly procedures. The ground terminal is integrated into the circuit board design and automatically establishes electrical connection with the vehicle body through the housing, making the system self-sufficient and reducing assembly complexity.
3Reliability
If individual ground terminals are grounded separately, then proper grounding is achieved, but the junction box requires more space and becomes less compact
Solution Approach 1:
Multiple separate grounding points are merged into a single common ground terminal on the circuit board. This consolidation eliminates the need for multiple distributed grounding structures within the junction box, allowing for a more compact design while maintaining proper grounding for all terminals through the unified grounding path.
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 design simplifies the grounding process, reduces the number of assembly steps, and allows for a more compact junction box by eliminating the need for extensive circuit board space, thereby improving work efficiency and reducing costs.
Implementation Method 1
The conductive member includes an elastic connection portion that is in elastic contact with the connection piece
Data Source
AI summary
The present disclosure relates to an electric junction box for vehicle. The electric junction box includes a housing including a connector housing configured to be fitted to a counterpart connector, a plurality of connector terminals being provided in the connector housing, a joint busbar accommodated in the housing, the joint busbar integrally including a plurality of terminals configured to be respectively connected to ground terminals of the counterpart connector, the plurality of terminals being provided as a part of the plurality of connector terminals, and a conductive member supported by the housing and configured to be grounded to a vehicle body. The joint busbar includes a plate-shaped connection piece connected to the conductive member. The conductive member includes an elastic connection portion that is in elastic contact with the connection piece.