Window Lifter Pivot Fastening for Tolerance-Compensated Rail Mounting
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Solution Overview
Problem
Existing window lifter fastening devices face issues with secure seating of the slide piece on the rail interface and tolerance compensation due to fluctuations in the rail interface dimensions.
Innovation Solution
A fastening device with a pivot piece having pivot pins with axial notches and eccentrics, allowing for a firm seat and tolerance compensation through a spring effect, minimizing noise and ensuring play-free mounting on the guide rail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pivot piece is mounted on the guide rail using conventional fastening devices, then the assembly is simple and straightforward, but the slide piece does not achieve a secure and firm seat on the rail interface
Solution Approach 1:
The pivot pin is segmented into two functional zones: a narrow point for insertion and tolerance compensation, and a socket-like groove base for secure engagement. This segmentation allows the same component to fulfill multiple functions - achieving both easy assembly and secure mounting without requiring additional fastening elements.
Solution Approach 2:
The pivot pin's geometry is optimized by varying its cross-sectional parameters along its length - narrower at the insertion point and wider at the engagement point. This parameter change enables the pivot pin to compensate for dimensional tolerances in the rail interface while ensuring a firm seat through the expanded engagement zone.
2Reliability
If the rail interface dimensions are held within tight tolerances to ensure secure mounting, then the mounting is firm, but manufacturing costs increase and tolerance compensation becomes difficult
Solution Approach 1:
The pivot pin is designed with a narrow point that anticipates and compensates for tolerance variations in the rail interface dimensions. This geometric feature acts as a cushioning element that absorbs dimensional deviations before the pivot pin engages with the groove base, ensuring reliable mounting even when rail interface tolerances are not tightly controlled.
Solution Approach 2:
The narrow point of the pivot pin serves as an intermediary element between the external environment (where tolerance variations occur) and the secure engagement zone (groove base). It mediates the tolerance fluctuations by providing a geometric transformation that converts dimensional variations into a consistent engagement geometry.
3Object-affected harmful factors
If conventional fastening devices are used without tolerance compensation features, then the device structure is simple, but noise occurs due to play in the mounting
Solution Approach 1:
The pivot pin geometry is designed to dynamically adapt to the rail interface dimensions through its narrow point, which allows for self-adjustment during assembly. This dynamic geometric feature eliminates play and ensures play-free mounting without requiring complex active adjustment mechanisms or additional damping components.
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 provides a secure and noise-minimized mounting of the pivot piece on the guide rail, effectively compensating for tolerance-induced fluctuations and ensuring stable operation of the window lifter.
Implementation Method 1
The axial notch in the pivot pin gives rise to a spring effect, which allows for compensation of tolerance-induced fluctuations in the region of the rail-side narrow points
Implementation Method 2
The pivot pins of the pivot piece and the pivot grooves on the rail side form a pivot joint
Data Source
AI summary
A fastening device for a vehicle window lifter, having at least one guide rail for slidable guidance of a carrier for a window glass, includes a pivot piece with a base body and two pivot pins which are formed thereon along a rotational axis and have two parallel planar surfaces. The pivot pin or each pivot pin has an axial notch. The guide rail has a connecting portion with mutually aligned pivot grooves for receiving and pivotably mounting the pivot pins of the pivot piece. A vehicle window lifter for adjusting a window glass of a motor vehicle, is also provided.