Window Lifter Driver Element With Pre-Assembled Anti-Rotation Screw
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Solution Overview
Problem
Existing driver elements for vehicle window lifters face issues with unreliable anti-rotation retention of screw connections during transport and handling, leading to loss of clamping force due to spot coatings that increase friction.
Innovation Solution
The driver element incorporates a screw element guided through a passage opening with a projectingly molded annular collar, providing form and force fits to secure the screw in a pre-assembly position, eliminating the need for additional coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spot coating is applied to the threaded opening and/or screw to prevent rotation during transport, then anti-rotation retention is improved, but clamping force is lost due to increased friction in the thread
Solution Approach 1:
The screw element is pre-assembled in a pre-assembly position during manufacturing where the threaded portion engages with the annular collar to prevent rotation. This preliminary positioning ensures the screw cannot rotate during transport and handling, eliminating the need for spot coating while maintaining full clamping force capability when the windowpane is installed
2Manufacturing precision
If the screw connection is positioned in a pre-assembly position with specific opening dimension maintained, then manufacturing precision is improved, but device complexity increases due to need for anti-rotation protection measures
Solution Approach 1:
The annular collar is integrated directly into the pane holder structure, merging the anti-rotation function with the existing clamping mechanism. This eliminates separate anti-rotation components and reduces overall device complexity while maintaining precise opening dimension control through the form-fit engagement between the screw's threaded portion and the annular collar
Data Source
AI summary
A driver element for a vehicle window lifter has a pane holder for fastening to a window pane, and a rail slider for guiding on a guide rail. The pane holder has two clamping jaws which form a clamping gap for receiving the window pane. At least part of a screw element vertically penetrates the clamping jaws, the screw element has a threaded portion and a head portion. The threaded portion can be screwed into a threaded opening in the rail slider in order to brace the clamping jaws in relation to each other such that the window pane is clamped. The screw element is at least partially guided through a passage opening having an annular collar which is projectingly molded thereon. In a pre-assembly position, the screw element is interlockingly and/or frictionally engagingly held on the annular collar.