Three-Part Window Regulator Tensioner for Cable Slack Control
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Solution Overview
Problem
Existing window regulators in vehicles face issues with cable tension control, leading to inaccuracies and premature wear due to slack or over-tension in cables, especially in frameless doors, which affect the short drop function and regulatory compliance.
Innovation Solution
A simple three-part tensioner system comprising a tensioner support, a tensioner sleeve, and a spring, which provides a biasing force to manage cable slack and maintain consistent tension, ensuring accurate window movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional play compensation mechanisms are used to absorb cable elongation, then cable tension can be maintained, but the device complexity increases due to multiple components
Solution Approach 1:
The patent combines the tensioning function and cable anchoring function into a single integrated tensioner assembly. The tensioning mechanism, cable anchor point, and adjustment components are merged into one compact unit that performs multiple functions simultaneously, eliminating the need for separate play compensation mechanisms while maintaining cable tension control.
Solution Approach 2:
The tensioner assembly serves multiple functions: it anchors the cable, maintains tension through its mechanical design, allows for adjustment to compensate for cable elongation, and provides a mounting point for the cable. This multi-functional design replaces what would traditionally require multiple separate components.
2Measurement precision
If irreversible tensioners are used on the lower cable to maintain constant ratio during short drop function, then cursor movement accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The tensioner assembly is designed to automatically maintain the correct cable tension and ratio during short drop operation through its mechanical configuration. The assembly self-regulates the cable tension based on the window position and door weight, eliminating the need for complex irreversible tensioning mechanisms while maintaining cursor movement accuracy.
Solution Approach 2:
The tensioner assembly allows for adjustment of cable tension parameters to compensate for cable elongation over time. By providing adjustable tensioning capability, the system maintains the correct motor-to-cursor ratio during short drop function without requiring irreversible tensioners, adapting to changing cable characteristics throughout the window regulator's lifetime.
3Measurement precision
If cable tension is increased to ensure accurate window movement, then cursor position accuracy is improved, but component wear increases and efficiency decreases
Solution Approach 1:
The tensioner assembly provides dynamic tension adjustment, allowing the cable tension to vary based on operating conditions such as window position, door weight, and cable elongation. This dynamic adjustment maintains sufficient tension for accurate window positioning while preventing excessive tension that would cause premature component wear, adapting the tension level to actual operational needs rather than using a fixed high-tension system.
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 three-part tensioner system effectively compensates for cable elongation and slack, enhancing the accuracy and longevity of window regulator operation while meeting regulatory requirements for short drop functionality.
Implementation Method 1
a spring disposed between the tensioner support and the tensioner sleeve
Implementation Method 2
the spring provides a biasing force between the tensioner support and the tensioner sleeve
Data Source
AI summary
A short drop tensioner for a window regulator for raising and lowering a window of a vehicle, including only three parts: a tensioner support; a tensioner sleeve; and a spring disposed between the tensioner support and the tensioner sleeve.