Bowden Cable End-Piece Preload Mounting to Prevent Rattle
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Solution Overview
Problem
Cable pulling elements, such as Bowden cables, in vehicle door locks often result in rattling noises due to loose connections and lack of tension, which affects the acoustic properties of vehicles and can lead to functional losses.
Innovation Solution
A force transmission device that includes a movably held force transmission element with a preload force, an end piece attached to the cable pulling element, and a stop to immobilize the end piece, preventing rattling by transmitting the preload force to the stop and maintaining the cable pulling element in a secure position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cable pulling elements are loosely connected without tension, then installation effort is reduced, but rattling noises occur due to incorrect contact
Solution Approach 1:
The force transmission element is pre-biased in a first direction with a preload force to automatically press the cable pulling element's end piece against the stop, ensuring correct contact and eliminating rattling noises before the cable is fully installed or tensioned
Solution Approach 2:
The preload force acts as a counterbalancing force that continuously presses the end piece against the stop, counteracting any loosening or movement that would cause rattling, allowing the cable to remain installation-free without tension
2Object-affected harmful factors
If cable pulling elements are tensioned during installation, then rattling noises are prevented, but installation effort increases
Solution Approach 1:
The system applies a preload force to the force transmission element in advance, which automatically tensions the cable pulling element through mechanical biasing, eliminating the need for manual tensioning operations during installation
Solution Approach 2:
The force transmission element automatically maintains cable tension through its biased movement and preload force mechanism, eliminating the need for external tensioning tools or procedures during installation
3Ease of manufacture
If the cable pulling element is loosely held, then installation is simpler, but functional reliability decreases due to potential loss of contact
Solution Approach 1:
The end piece is pre-positioned against the stop by the biased force transmission element, ensuring reliable contact is established before the cable becomes operational, maintaining both installation simplicity and functional reliability
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 effectively prevents rattling and ensures secure fastening of the cable pulling element, enhancing the acoustic properties and preventing functional losses by maintaining the cable in a tension-free yet securely held state, eliminating the need for additional decoupling measures.
Implementation Method 1
The movably held force transmission element is held biased in a first direction with a preload force to an end position
Implementation Method 2
the movably held force transmission element transmits at least part of the preload force to the end piece of the cable pulling element
Data Source
AI summary
A force-transmission device for an actuation mechanism of a movable vehicle element. The force-transmission device includes a movably held force-transmission element, a Bowden cable element having an end, an end piece fastened to the end of the Bowden cable element, and a stop. The movably held force-transmission element is held in a manner preloaded in a first direction into an end position by a preload force and is movable in a second direction opposite to the first direction in order to transmit an actuating force for the actuation mechanism. The end piece of the Bowden cable element is held against the movably held force-transmission element. The movably held force-transmission element transmits, in the end position, at least a portion of the preload force to the end piece of the Bowden cable element, and the end piece is held so as to be pressed against the stop.