Sliding Door Guide Rail with Curved Track and Two-Layer Steel
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Solution Overview
Problem
Existing guide devices for sliding doors, particularly those using formed sheet steel rails, face challenges in absorbing forces due to single-layer construction leading to deformation and inaccurate roller guidance, as well as high compressive loads at a single contact point.
Innovation Solution
A guide device with a convexly curved track and a concavely curved roller, featuring two spaced contact points and a two-layer track design, reduces contact pressure and improves axial guidance, while a profiling feature enhances stability and prevents layer movement, allowing for higher load transfer and improved centering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-layer steel sheet is used for the guide rail, then the manufacturing is simpler and cost is lower, but the force absorption capability is limited and deformation occurs
Solution Approach 1:
The guide rail is divided into two layers of sheet steel that are partially in contact with one another in the area of the raceways. This segmentation allows each layer to contribute to force absorption while maintaining a relatively simple overall structure, resolving the contradiction between strength and complexity.
Solution Approach 2:
The guide rail uses a composite structure of two layers of sheet steel, combining multiple layers to achieve enhanced force absorption capability. This composite approach allows the rail to handle higher loads without requiring a single thick layer, thus improving strength while controlling complexity.
2Stress or pressure
If the roller contacts the track at a single point, then the structure is simpler, but the compressive load is high causing deformation
Solution Approach 1:
The roller is designed with a concave curvature that matches the convex curvature of the track, creating a curved contact interface instead of a point contact. This curvature transformation distributes the compressive load over a larger contact area, reducing contact pressure while maintaining a relatively simple spherical-like geometry for both roller and track.
3Manufacturing precision
If the roller has a large contact area with the track, then the contact pressure is reduced, but the guidance precision in the axial direction deteriorates
Solution Approach 1:
The roller and track are designed with specific curved surfaces that provide both adequate contact area for pressure distribution and precise geometric definition for accurate guidance. The concave-convex curvature pairing creates a contact zone that is large enough to reduce pressure but sufficiently constrained in shape to maintain axial guidance precision.
4Strength
If a two-layer track design is used, then the rigidity and load transfer capability are improved, but the manufacturing complexity increases
Solution Approach 1:
The two-layer structure is implemented by stacking sheet steel layers and allowing them to contact in the raceway area, which can be achieved through relatively simple assembly processes. The segmentation into layers provides enhanced load transfer capability while avoiding the need for complex monolithic construction.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3D
AI summary
The invention relates to a guide device, in particular for sliding doors, having a guide rail (3) made of a shaped steel plate, which has at least one track (4, 5) on which at least one running roller (10) of a running part rolls, wherein the guide rail (3) is formed with two layers in the region of the at least one track (4, 5) and the at least one track (4, 5) is curved concavely or convexly upward or downward, wherein the running roller (10) makes contact with the curved track (4, 5) at two points (15, 16) which are spaced apart from each other and which are arranged on opposite sides of a mid-plane of the track (4, 5).