Roller-blind shaft sliding ring contactless mounting
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Solution Overview
Problem
Existing roller-blind shafts for vehicle interiors face challenges in achieving simple and low-friction rotational mounting of sleeve-like sections on a curved bearing axle, which affects the ease of use and durability of shading systems for rear windows and glass roof regions.
Innovation Solution
The implementation of axially secured sliding rings, preferably made of silicone or PTFE, which mount the roller-blind shaft sections in a contactless, radially spaced manner on the bearing axle, ensuring low-friction rotatability and secure axial positioning, allowing for a wide temperature range operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If roller-blind shaft sections are plugged axially into one another with integrally embossed beads or bearing bushes, then rotational mounting on the bearing axle is possible, but the mounting complexity and friction increase
Solution Approach 1:
A sliding ring is introduced as an intermediary component between the roller-blind shaft section and the bearing axle. The sliding ring mounts the shaft section in a contactless manner at a radial spacing from the bearing axle, eliminating direct contact and friction while simplifying the mounting structure. The sliding ring can be produced separately and inserted axially, or integrated into the shaft section via two-component injection molding.
2Ease of operation
If roller-blind shaft sections are mounted with contactless sliding rings, then friction is reduced and rotatability is enhanced, but the mounting structure becomes more complex
Solution Approach 1:
The sliding ring and roller-blind shaft section can be produced as an integrated two-component unit via injection molding, merging the mounting function into the shaft section itself. This eliminates the need for separate sliding ring components while maintaining the contactless mounting advantage, thereby reducing overall structural complexity.
3Reliability
If sliding rings are used for axial securing of roller-blind shaft sections, then axial migration is prevented and operational durability is improved, but manufacturing complexity increases
Solution Approach 1:
The sliding ring and roller-blind shaft section are produced together in a two-component injection molding process, integrating the axial securing function into the manufacturing of the shaft section itself. This eliminates the need for separate manufacturing and assembly steps for the sliding ring, thereby maintaining manufacturing simplicity while ensuring operational durability.
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 enables easy and low-friction rotation of the roller-blind shaft sections, enhancing the durability and operational range of shading systems for vehicle windows and glass roof regions by reducing friction and preventing axial migration of the sliding rings.
Implementation Method 1
The sliding ring mounts the roller-blind shaft section in a contactless manner at a radial spacing from the bearing axle... ensuring low-friction rotatability
Implementation Method 2
The silicone O-ring is preferably coated with a PTFE varnish... A sliding ring which is designed in this way has a sufficiently satisfactory sliding function in a great temperature range between −30° C. and 120° C.
Implementation Method 3
It is also possible to provide fluorination for a corresponding silicone O-ring
Data Source
AI summary
A roller-blind shaft for a protective apparatus in a vehicle interior on which at least one flexible flat structure is held such that it can be wound up and unwound, the roller-blind shaft having a curved bearing axle and sleeve-like roller-blind shaft sections which are mounted rotatably on the bearing axle and are connected axially to one another to form a rotationally locked unit.In each case at least one axially inserted and axially secured sliding ring is provided for each roller-blind shaft section for mounting the roller-blind shaft sections on the bearing axle, which sliding ring mounts the roller-blind shaft section in a contactless manner at a radial spacing from the bearing axle.