Snap-Fit Cable Roller for Low-Wear Vehicle Window Lifts
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Solution Overview
Problem
Existing deflection devices for motor vehicle window lifts, such as polyarylether plastic deflection pieces and cable rollers, suffer from high costs, wear, and noise due to abrasion and require additional securing elements, failing to meet strength requirements, especially when attached to plastic carriers.
Innovation Solution
A deflection device with a cable roller having a circumferential running channel and central bearing opening, made of plastic with a snap-fit connection to a carrier-side bearing journal, minimizing components and wear, and using a metal sleeve for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyarylether plastic deflection pieces are used, then the cost is high and wear resistance is insufficient, but the structural simplicity is maintained
Solution Approach 1:
The deflection device uses a composite structure combining a plastic carrier component with a metal reinforcement element (stiffening rib or insert). The metal element provides the necessary wear resistance and mechanical strength at the cable contact points, while the plastic carrier maintains structural simplicity and cost-effectiveness. This composite approach resolves the contradiction by selectively applying materials based on functional requirements.
2Strength
If cable rollers with additional securing elements are used, then the mounting strength is improved, but the device complexity and cost increase
Solution Approach 1:
The bearing element is integrated directly into the carrier component as a unified structure. The carrier component includes a bearing journal that directly receives the cable roller, eliminating the need for separate securing elements like clips, bolts, or additional mounting brackets. This integration maintains mounting strength while reducing device complexity and component count.
Solution Approach 2:
The carrier component serves multiple functions simultaneously: it provides structural support, integrates the bearing element for roller mounting, and includes the reinforcement structure for cable guidance. This multi-functionality eliminates the need for separate specialized components, reducing overall device complexity while maintaining necessary strength.
3Ease of manufacture
If plastic carrier components are used, then the cost is reduced and ease of manufacture is improved, but noise emissions increase due to cable pressing
Solution Approach 1:
The carrier component uses a composite structure where a plastic carrier is combined with a metal reinforcement element positioned at the cable contact and deflection points. The metal reinforcement reduces cable pressing into the plastic, thereby minimizing noise emissions from cable-plastic interaction, while the plastic carrier maintains cost-effectiveness and ease of manufacture.
4Ease of manufacture
If cable rollers are attached to plastic carriers, then the ease of manufacture is improved, but strength requirements are not met
Solution Approach 1:
The solution combines a plastic carrier component with a metal reinforcement element (stiffening rib or insert) positioned at the cable contact points. The metal element provides the necessary heat-creep resistance and mechanical strength, while the plastic carrier maintains ease of manufacture. The reinforcement element is integrated into the carrier structure to provide localized strength where required.
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
The solution allows for easy, automated installation with minimal components, reduces wear and noise, and optimizes slip with grease pockets, ensuring low friction and reduced material usage.
Implementation Method 1
optimizes slip with grease pockets, ensuring low friction
Data Source
AI summary
A deflection device is for a traction cord of a window lift of a motor vehicle. The deflection device has a cord pulley, which has a circumferential track for the traction cord and a central bearing opening, and a carrier for the cord pulley. A carrier-side journal is provided for rotatably mounting the cord pulley, wherein the cord pulley is ring-shaped and has an internal ring wall surrounding the central bearing opening and an external ring wall having the track. The ring-shaped cord pulley is joined to the journal with a snap-fit assembly.