Flexible Printed Circuit Mounting for Gearbox Vibration Protection
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Solution Overview
Problem
Flexible printed circuits in gearbox control units of commercial vehicles are prone to damage during assembly and operation due to pinching between housing sections and exposure to vibrations, which can lead to abrasion and non-predictable movements.
Innovation Solution
The flexible printed circuit features an arm section with an arm mounting interface that includes openings for receiving fastening devices, allowing precise positioning and preventing damage by utilizing existing bracket snaps for snap fitting functionality, and forming a c-shape to secure the circuit between housing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the flexible printed circuit is arranged in the proximity of sharp housing edges to save space, then the device complexity is reduced, but the circuit may get into contact with sharp edges causing damage
Solution Approach 1:
The patent introduces an intermediary protective structure (the housing section with recess and cover) that mediates between the flexible printed circuit and the sharp housing edges. This protective housing section absorbs the harmful effect of sharp edges while maintaining the compact arrangement, allowing the circuit to remain close to edges without direct contact.
2Ease of operation
If the flexible printed circuit is made flexible to accommodate assembly and vibration, then the ease of operation is improved, but the circuit can easily be pinched and damaged during assembly
Solution Approach 1:
The patent implements preliminary protective action by designing the housing section with a specifically shaped recess and cover that pre-protects the flexible printed circuit before assembly operations occur. The recess is positioned and dimensioned to prevent pinching during the assembly process, addressing the vulnerability before it can manifest.
3Duration of action of stationary object
If the arm section is allowed to move freely to accommodate vibrations, then the durability is improved, but the circuit may experience non-predictable movement causing damage
Solution Approach 1:
The patent applies the dynamics principle by creating a controlled dynamic system where the arm section can move within defined boundaries (guided by the housing recess) rather than being completely fixed or entirely free. This controlled movement allows the circuit to accommodate vibrations while maintaining predictable positioning through the geometric constraints of the recess and cover structure.
Data Source
AI summary
A flexible printed circuit (112) for a gearbox control unit (102) of a commercial vehicle includes a body section (126) and an arm section (148). The arm section (148) is attached to the body section (126). The body section (126) includes a body mounting interface (150) for mounting the flexible printed circuit (112) to a bottom housing section (104) and/or a top cover (6) of a gearbox control unit (102). The arm section (148) includes an arm mounting interface (130) having at least one opening (132). The opening (132) is configured to receive a fastening device (134) arranged at a bottom housing section (104) and/or a top cover (6) of the gearbox control unit (102).