Trailer Coupling Spring Compensation for Cable Tension
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Solution Overview
Problem
Existing trailer coupling systems require complex and labor-intensive assembly and adjustment processes, particularly with Bowden cables, which can lead to inefficiencies and the need for periodic re-adjustment to ensure reliable operation.
Innovation Solution
A trailer coupling system featuring a drive unit with length compensation using springs and flexible traction elements, allowing for bidirectional movement and additional degrees of freedom, which simplifies the adjustment and locking of the coupling arm between use and non-use positions, and can be retrofitted to existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Bowden cable is used for the fixing device, then the trailer hitch can be unlocked, but the assembly effort is considerable and periodic readjustment is necessary
Solution Approach 1:
The Bowden cable is divided into multiple individual cables (first cable for locking, second cable for unlocking) instead of a single complex cable assembly. This segmentation simplifies the assembly process while maintaining reliable operation, as each cable can be independently installed and adjusted without affecting the others.
Solution Approach 2:
The patent extracts and eliminates the need for an additional jacket surrounding the pulling element. By using separate cables without requiring a complex Bowden cable structure, the assembly effort is significantly reduced while the fixing device remains reliable.
2Reliability
If a Bowden cable is used for the fixing device, then the trailer hitch can be unlocked, but periodic readjustment is necessary to ensure safe and precise operation
Solution Approach 1:
By segmenting the cable system into separate, simple cables rather than a complex Bowden cable, the patent eliminates the need for periodic readjustment. The simplified cable arrangement maintains tension and operation reliability without requiring maintenance interventions.
3Adaptability or versatility
If the coupling arm is adjusted between position of use and non-use, then the trailer coupling is versatile, but the traction element becomes slack or loose
Solution Approach 1:
The patent employs dynamic cable routing and tensioning mechanisms that automatically maintain cable tension during the coupling arm's movement between use and non-use positions. The cable system adapts its configuration dynamically, ensuring continuous reliability regardless of the arm's position.
Solution Approach 2:
The patent introduces intermediary elements (such as guide pulleys or tensioning mechanisms) that mediate between the coupling arm's movement and the cable tension. These intermediaries ensure the traction element remains taut during position changes, maintaining reliable operation throughout the full range of motion.
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
This solution reduces assembly effort, ensures reliable operation by maintaining tension in the traction element during complex movements, and allows for easy adjustment and locking of the coupling arm, enhancing the overall usability and reliability of the trailer coupling system.
Implementation Method 1
The length compensation device comprises a spring arrangement, in particular a torsion spring or a coil spring, which is arranged on the at least one traction element
Implementation Method 2
The at least one flexible pulling element comprises a section made of flexible plastic or rubber
Data Source
Figure 1~4c
Figure 3~8
Figure 6~7
AI summary
The trailer coupling (10) has a bearing (12), which has a vehicle bearing part (13) and a coupling arm-bearing part that is mounted at the vehicle bearing part between a custom position and a non-usage position in a mobile manner. A coupling arm is arranged at the coupling arm-bearing part. The bearing has a restoring spring arrangement (78) that impinges a bearing retainer (25) and a bearing element (26) relative to each other towards a predetermined position.