Variable Stiffness Ribs for Electric Connection Box Vibration Control
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Solution Overview
Problem
The existing electric connection boxes in vehicles experience rattling of power integration units due to vibrations, leading to potential connection failures and wear at soldering points, which is exacerbated by the uniform deformation of ribs intended to prevent rattling, making secure positioning and connection of connection devices difficult.
Innovation Solution
The electric connection box features a design with ribs of varying stiffness, where ribs closer to the connection devices are stiffer and have a larger vertex angle than those further away, allowing for secure positioning and connection while preventing rattling by deforming easily to absorb vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple ribs of the same shape are provided to prevent rattling, then rattling prevention is improved, but positioning precision of connection devices deteriorates
Solution Approach 1:
The patent applies local quality by making ribs have different shapes based on their location. Ribs closer to the connection device location are made stiffer (with smaller vertex angles) to ensure precise positioning, while ribs farther away are made more flexible (with larger vertex angles) to effectively prevent rattling. This spatial variation in rib properties resolves the contradiction between rattling prevention and positioning precision.
Solution Approach 2:
The patent segments the ribs into different groups based on their distance from the connection device. By dividing the ribs into those closer to the connection device and those farther away, each group can be optimized for its specific function - positioning versus vibration damping - thereby resolving the contradiction.
2Object-affected harmful factors
If ribs closer to the connection device deform more, then rattling prevention is improved, but connection reliability deteriorates
Solution Approach 1:
The patent implements local quality by assigning different stiffness characteristics to ribs based on their location. Ribs near the connection device are made stiffer to maintain connection reliability, while ribs farther away are made more flexible for effective rattling prevention. This localized differentiation resolves the contradiction between rattling prevention and connection reliability.
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 ensures secure positioning and connection of the connection devices, effectively preventing rattling and ensuring reliable operation of the electric units within the vehicle's electric connection box.
Implementation Method 1
a plurality of ribs arranged to at least one of the box main body and the electric unit, the ribs being deformed so as to prevent rattle motion of the electric unit in the box main body
Data Source
AI summary
An electric connection box including a box main body, an integration mounted at the box main body, a pair of connection devices, and a plurality of ribs. The pair of connection devices are structured with one of connection devices provided at the integration and the other of connection devices provided at the box main body. The plurality of ribs are arranged at the box main body, and abuts on the integration and is deformed when the integration is mounted at the box main body so as to prevent rattling of the integration. Second ribs among the plurality of ribs, which are arranged close to the other of connection devices, are formed stiffer than first ribs arranged away from the other of connection devices farther than the first ribs.