Electrical Connection Box Bus Bar Damping for Relay Vibration
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Solution Overview
Problem
Electrical connection boxes with bus bars experience abnormal noise due to vibrations from relay components, as the existing designs lack effective vibration damping, leading to amplified vibrations being transmitted to the bus bar.
Innovation Solution
Incorporating a vibration damping portion in the bus bar or housing of the electrical connection box, which sandwiches the bus bar base portion between a case member and a cover member, effectively absorbing and damping vibrations from the relay component, thereby reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bus bar is housed in the housing with a certain degree of play (slack), then the bus bar can be easily installed and positioned, but vibration from the relay component is transmitted to the bus bar, causing abnormal noise
Solution Approach 1:
A vibration damping portion is introduced as an intermediary element between the bus bar and the housing. This damping portion absorbs and attenuates vibration from the relay component before it reaches the bus bar, preventing abnormal noise while maintaining the housing play for easy installation. The damping portion acts as a mediator that decouples the vibration transmission path.
Solution Approach 2:
The physical parameters of the housing structure are changed by adding a vibration damping portion with specific material properties (high damping capacity). This modifies the vibration transmission characteristics of the housing system, reducing the transmission of vibration frequencies that would otherwise cause abnormal noise in the bus bar.
2Reliability
If the relay terminal fitting physically and electrically connects the terminal connection portions using spring force, then electrical connection is achieved, but vibration may be amplified by the relay terminal fitting and transmitted to the bus bar
Solution Approach 1:
The vibration damping portion serves as an intermediary that interrupts the vibration amplification path from the relay terminal fitting to the bus bar. While the spring force in the terminal fitting maintains reliable electrical connection, the damping portion absorbs the vibration energy before it can be amplified and transmitted to the bus bar structure.
3Device complexity
If no vibration damping portion is provided, then the device structure remains simple, but vibration from the relay component propagates to the bus bar base portion, causing abnormal noise
Solution Approach 1:
A vibration damping portion is introduced as a minimal intermediary element between the housing and the bus bar. This simple damping component effectively absorbs vibration from the relay component, preventing abnormal noise without significantly increasing device complexity. The damping portion is strategically positioned to intercept vibration before it reaches the bus bar base portion.
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 significantly suppresses bus bar vibrations and associated abnormal noise, enhancing the electrical connection box's performance by absorbing vibrations at specific frequencies, reducing noise and preventing abrasion at contact points.
Implementation Method 1
at least one vibration damping portion that damps vibration accompanying driving of the relay component propagated to the bus bar base portion via the bus bar terminal connection portion is provided in at least one of the bus bar and the housing
Data Source
AI summary
An electrical connection box includes: a bus bar that includes a bus bar base portion having a flat plate shape and a bus bar terminal connection portion having a male tab shape erected from the bus bar base portion; a relay component in which a relay terminal connection portion is provided; a relay terminal fitting that physically and electrically connects the bus bar terminal connection portion and physically and electrically connects the relay terminal connection portion; and a housing that houses the bus bar, the relay component, and the relay terminal fitting. The housing includes a case member in which a bus bar housing chamber that houses the bus bar is formed, and a cover member that covers the bus bar and the case member. At least one vibration damping portion that damps vibration accompanying driving of the relay component is provided in the bus bar.