Rotary Connector Cable Layout to Prevent Short-Circuit After Over-Rotation
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Solution Overview
Problem
In rotary connector devices, excessive rotation can lead to cable cuts, causing short-circuits between multiple flat cables arranged in a housing space, which existing designs fail to adequately prevent.
Innovation Solution
The rotary connector device features a fixed body and a rotation body with a connector that includes distinct openings and a partition wall, ensuring cables are inserted from different positions and cut at different angles, preventing contact and short-circuits by positioning the cut ends of the cables in a way that the partition wall and the geometry of the openings prevent contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple flat cables are arranged in the housing space between fixed body and rotation body, then cable connectivity is improved, but short-circuit risk increases when cables are cut due to excessive rotation
Solution Approach 1:
The housing space is segmented into multiple independent cable passages, each accommodating a separate flat cable. These passages are partitioned by walls that extend along the axial direction, creating isolated channels that prevent cut cable ends from contacting adjacent cables. This segmentation maintains cable connectivity while eliminating short-circuit risks.
Solution Approach 2:
Partition walls serve as intermediary structures between adjacent cable passages. These walls physically separate the cables and their potential cut ends, acting as a barrier that prevents electrical contact between different cable circuits. The partition walls extend in the axial direction to ensure complete isolation throughout the connector length.
2Volume of moving object
If cables are arranged parallel to rotation axis, then space utilization is improved, but cable vulnerability to cutting increases during excessive rotation
Solution Approach 1:
The housing space is divided into multiple independent passages that run parallel to the rotation axis. Each passage contains a single cable, and the passages are separated by partition walls. This segmentation allows efficient space utilization while protecting cables from cutting, as the partition walls prevent cut ends from contacting adjacent cables even when cables are arranged parallel to the rotation axis.
3Device complexity
If single opening is used for cable insertion, then connector structure is simplified, but all cables are vulnerable to short-circuit when cut
Solution Approach 1:
Instead of a single opening, the connector uses multiple separate openings, each leading to its own cable passage. These passages are segmented by partition walls that extend along the axial direction. This segmentation creates isolated channels for each cable, maintaining relatively simple connector structure while effectively preventing short-circuits between adjacent cables.
Data Source
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AI summary
A rotary connector device (100) includes a fixed body (10), a rotation body (20), and a connector (62). The connector (62) includes: a first opening (OP1) that connects the second space (S2) to the first space (S1); and a second opening (OP2) that is partitioned with the first opening (OP1) and that connects the second space (S2) to the first space (S1). One end of a first cable (30) is connected to a first electrode (58a) provided in the second space (S2) of the connector (62). One end of a second cable (40) is connected to a second electrode (58b) provided in the second space (S2) of the connector (62). The first cable (30) passes through the first opening (OP1) and is arranged such that the other end of the first cable (30) is connected to the rotation body (20). The second cable (40) passes through the second opening (OP2) and is arranged such that the other end of the second cable (40) is connected to the rotation body (20)