Cable Durability in Power Sliding Door Drives
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Solution Overview
Problem
The durability of cables in power sliding door devices is compromised due to strong pressure on corners, leading to premature damage and reduced maintenance cycles.
Innovation Solution
The design incorporates a spiral guide groove on the drum, a pulley with a circular arc-shaped pulley groove and flange portions, and a spring member to increase the path length, ensuring the cable is not strongly pressed against corners, with a round cable cross-section and circular arc-shaped connecting units between the pulley groove and flange portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flat roller pulley with right-angled corners is used in the tensioner mechanism, then the cable can be guided and tensioned effectively, but the corners strongly press the resin film coating on the cable, causing damage and reducing durability
Solution Approach 1:
The patent replaces the flat roller pulley with right-angled corners with a groove-shaped pulley that has a curved bottom surface. This curvature eliminates the concentrated stress points at the corners, distributing the pressure on the cable more evenly and preventing damage to the resin film coating, thereby improving cable durability while maintaining effective guidance and tensioning functionality
2Volume of stationary object
If the cable path length is kept short, then the device structure is compact, but the cable cannot accommodate elongation from long-term usage and maintains proper tension
Solution Approach 1:
The patent employs a groove-shaped pulley that can rotate around the pulley shaft, creating a dynamic tensioning mechanism. As the cable elongates over time, the pulley rotates to adjust the cable path length, automatically maintaining proper tension without requiring a longer initial cable path. This dynamic adjustment allows the device to remain compact while accommodating cable wear and elongation throughout its service life
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 configuration effectively prevents cable damage, enhances durability, and extends the maintenance cycle of the opening-closing body driving device while ensuring high reliability.
Implementation Method 1
a spring member accommodated in the case, the spring member being configured to press the pulley holder in such a direction that a path length between the drum and the cable entrance portion is increased
Implementation Method 2
a pulley provided rotatably around the pulley shaft and movably in an axial direction of the pulley shaft
Data Source
AI summary
A cross-sectional shape of an open-side cable 22a is formed into a round shape, and a cross-sectional shape of respective connecting units 52 between a pulley groove 50 of a pulley 46 and flange portions 51 is formed into a circular arc shape. Thus, it is possible to surely suppress damage of the open-side cable 22a caused by being strongly pressed to a corner as a conventional manner. Therefore, it is possible to improve durability of the open-side cable 22a, whereby it is possible to extend a maintenance cycle of a driving unit and obtain high reliability thereof.