Sliding Door Cable Deflection for Stable Tension Adjustment
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Solution Overview
Problem
Existing sliding door drives in motor vehicles face challenges in providing sufficient and consistent tensile force over the vehicle's lifespan due to wear and installation tolerances, leading to discontinuous movement.
Innovation Solution
A drive system with an adjustable cable deflection mechanism using a rotatably mounted deflection wheel and fastening means, allowing for adjustable tensile stress in the drive cable through eccentric and clamping mechanisms, ensuring reliable and smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive cable is guided over fixed deflection devices, then the sliding door can be moved with sufficient force, but wear in the guide components causes decreasing tensile stress leading to discontinuous movement
Solution Approach 1:
The patent applies the dynamics principle by making the deflection wheel adjustable rather than fixed. The fastening means allows the deflection wheel position to be modified, enabling dynamic adaptation of the drive cable tension throughout the service life of the system. This resolves the contradiction by allowing the system to maintain reliable continuous movement (improving reliability) while extending the duration of effective action through adjustable tension compensation for wear.
2Device complexity
If the deflection wheel is fixedly mounted, then the structure is simple, but installation tolerances cause inconsistent tensile force in the drive cable
Solution Approach 1:
The fastening means enables the deflection wheel to be positioned dynamically during installation and maintenance. This adjusts for installation tolerances and ensures consistent tensile force in the drive cable while maintaining relatively simple device structure. The adjustment capability compensates for manufacturing variations without significantly increasing overall system complexity.
Solution Approach 2:
The patent applies parameter changes by allowing the position parameter of the deflection wheel to be modified through the fastening means. This enables adjustment of the geometric parameters of the cable path, thereby optimizing and standardizing the tensile force in the drive cable despite variations in installation tolerances and manufacturing precision.
3Ease of manufacture
If the fastening means is designed for simple mounting, then installation is easy, but adjustment of tensile stress becomes difficult
Solution Approach 1:
The fastening means is designed with multi-functionality, serving both as a simple mounting mechanism and as an adjustment device for tensile stress. This universal component enables both easy assembly during manufacture and subsequent adjustment of drive cable tension, resolving the contradiction between ease of manufacture and ease of operation.
Data Source
AI summary
A drive of a sliding door of a motor vehicle, comprising an electric drive unit, a drive cable, a guide for the drive cable, the sliding door being movable relative to a body by operation of the drive cable, and a cable deflection having a deflection wheel which is rotatably mounted in the cable deflection, wherein the cable deflection is adjustable to adjust a position of the deflection wheel to adjust a tensile stress in the drive cable.