Vehicle Window Lifter Carrier Guide Cutouts for Noise Reduction
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Solution Overview
Problem
Existing vehicle window lifters experience undesirable rubbing or grinding noises due to friction and particle accumulation between the flexible traction means and the guide surface, despite lubrication efforts, which are not effectively addressed by previous solutions.
Innovation Solution
A carrier with a guide surface featuring cutouts for discharging particles, such as through openings or depressions, to prevent particle accumulation and reduce friction, allowing the flexible traction means to slide smoothly and minimize noise during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the flexible traction means is deflected on the carrier by more than 45° (e.g., by 90°) to increase the maximum lifting length, then the possible lift for the window pane is increased, but friction surfaces are formed between the traction means and the guide surface which cause disturbing rubbing or grinding noises
Solution Approach 1:
The patent extracts the harmful particles from the guide by providing cutouts that allow them to be discharged from the guide surface. This removes the source of friction and noise generation while preserving the deflection geometry needed for increased lifting length.
Solution Approach 2:
The guide surface is designed with cutouts creating a porous-like structure that allows particle discharge. This enables the guide to maintain its structural integrity while providing pathways for particle removal, reducing friction and noise.
2Object-generated harmful factors
If lubrication (greasing) is applied to the guide to avoid rubbing or grinding noises, then friction is reduced temporarily, but particles from dust, dirt, salt, water, and cleaning agents mix with the lubricant to form abrasive paste that increases friction and noise
Solution Approach 1:
The cutouts extract particles from the lubricated guide surface, preventing them from mixing with the lubricant to form abrasive paste. This maintains the effectiveness of lubrication over continuous operation.
Solution Approach 2:
The cutouts act as an intermediary mechanism that removes particles before they can contaminate the lubricant, preserving the lubrication system's effectiveness and reducing noise during continuous operation.
3Duration of action of moving object
If particles accumulate on the guide surface through continuous operation, then friction and rubbing or grinding noises increase, but no effective discharge mechanism is provided in conventional designs
Solution Approach 1:
The guide structure itself provides the discharge function through integrated cutouts. The guide serves dual purposes: guiding the traction means and discharging particles, eliminating the need for separate discharge mechanisms.
Solution Approach 2:
The cutouts continuously extract particles from the guide surface during operation, preventing accumulation and maintaining low friction and noise levels throughout the service life.
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 cutouts on the guide surface effectively remove particles, preventing their accumulation and reducing noise by allowing them to be discharged, thus enhancing the operational silence and longevity of the vehicle window lifter.
Implementation Method 1
at least one cutout is formed on the guide surface for discharging particles from the guide of the carrier provided for the flexible traction means
Implementation Method 2
the flexible traction means slides along the guide surface of the carrier with at least one portion when the window pane is adjusted by means of the carrier
Data Source
AI summary
A carrier for a vehicle window lifter configured to be connected to a window pane and adjusted by the vehicle window lifter. The carrier including a guide for a cable of the vehicle window lifter. The guide forms a guide surface and the cable lies along the guide surface when the vehicle window lifter is properly mounted. The guide surface defines at least one cutout configured to receive discharged particles from the guide surface of the carrier.