Vehicle Door Window Lifter Bowden Sheath Layout for Reliable Closure
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Solution Overview
Problem
Window lifter systems in motor vehicle doors face reliability issues due to settlement processes and high frictional forces, which can prevent the windowpane from being reliably brought into the closed position, especially under temperature fluctuations and large forces.
Innovation Solution
The system incorporates a Bowden cable sheath guided between the second guide rail and the first guide rail, with the sheath mounted at the upper end of the second guide rail and a connecting region between the upper and lower end regions of the first guide rail, reducing cable slack and friction, and uses cable deflectors to efficiently transfer pulling forces to the sliding pieces, ensuring reliable closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive cable is guided in a Bowden cable sheath between the guide rails, then cable friction is reduced and settlement is minimized, but the device complexity increases due to additional mounting structures
Solution Approach 1:
A Bowden cable sheath is introduced as an intermediary component between the drive cable and the guide rails. The sheath is mounted at the upper end of the second guide rail and at a connecting point on the first guide rail, creating a stable cable path that reduces friction and minimizes the impact of settlement processes on window closure reliability.
2Reliability
If the Bowden cable sheath is mounted at the upper end of the second guide rail and connecting region of the first guide rail, then cable slack is reduced, but the manufacturing complexity increases
Solution Approach 1:
The Bowden cable sheath is pre-mounted at specific locations (upper end of second guide rail and connecting region of first guide rail) before final assembly. This preliminary positioning ensures proper cable tension and minimizes slack during operation, while the mounting structures are designed to facilitate straightforward installation.
3Ease of operation
If cable deflectors are used to transfer pulling forces, then the pulling force transmission is improved, but the device complexity increases
Solution Approach 1:
Cable deflectors are introduced as intermediary elements that redirect the drive cable between the cable drum and the sliding pieces. These deflectors optimize the transmission of pulling forces by ensuring proper cable routing and tension distribution, improving the efficiency of window pane movement while maintaining a relatively simple overall structure.
Data Source
AI summary
A motor vehicle door having a frame defining a window opening, and a window lift system having a first guide rail, a first sliding piece guided on the first guide rail, a second guide rail, a second sliding piece guided on the second guide rail, a cable drum and a drive cable driven by the cable drum and coupled to the sliding pieces, the drive cable guided in a Bowden cable sheath between an upper end region of the second guide rail and a connection region located between an upper end region of the first guide rail and a lower end region of the first guide rail. The Bowden cable sheath fastened in the upper end region of the second guide rail and in the connection region of the first guide rail.