Corner Bearing Sliding Lining Reduces Wear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional corner bearings for windows and doors with pivoting sashes experience high friction and wear in the overlapping area of steering levers, leading to abrasion, lubricant leakage, and reduced durability due to high compressive and bending forces.
Innovation Solution
A sliding coating with webs on both longitudinal sides of the lower steering lever, connected by a connecting web around the near end, provides a stronger and more stable sliding lining that reduces direct friction and wear, while maintaining the original shape of the steering lever and concealing the mechanical part when the sash is open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If steering levers are designed to pivot about a common axis of rotation in the overlapping area, then the corner bearing achieves compact design and proper functionality, but high friction and wear occur in the overlapping area due to high compressive and bending forces
Solution Approach 1:
A sliding lining is introduced as an intermediary element between the two steering levers in the overlapping area. This sliding lining absorbs the high friction and wear through its own sacrificial surface, protecting the steering levers from direct contact and scoring. The sliding lining can be replaced when worn, while the steering levers maintain their structural integrity.
Solution Approach 2:
The sliding lining changes the friction parameters in the overlapping area by providing a low-friction sliding surface. Materials with self-lubricating properties or low coefficients of friction are selected for the sliding lining to reduce the friction force between steering levers during pivoting motion.
2Reliability
If wear plates made of plastic material are used on steering levers, then low wear is achieved, but the plastic wear plates must be replaced more frequently under high sash weights and rapid scoring occurs
Solution Approach 1:
The sliding lining is constructed from composite materials that combine the advantages of different material properties. This may include fiber-reinforced plastics for wear resistance, metal matrices for strength under high loads, or combinations of materials that provide both low friction and high load-bearing capacity, extending service life under heavy sash weights.
Solution Approach 2:
Different material properties are applied to different regions of the sliding lining based on the specific stress and wear conditions in each area. High-strength materials are used in regions subjected to high compressive forces, while low-friction materials are used in regions with high sliding velocity, optimizing both durability and wear resistance.
3Ease of manufacture
If recesses are created in steering arms for sliding linings, then the sliding linings can be mounted, but the recesses cause weakening and increased deflection of the steering arms
Solution Approach 1:
The sliding lining is segmented into multiple sections or strips that can be mounted separately on the steering arm. This segmentation allows the sliding lining to wrap around the steering arm surface without requiring deep recesses, maintaining the structural integrity and strength of the steering arm while still providing wear protection in the overlapping area.
Solution Approach 2:
Instead of creating recesses in the planar surface of the steering arm, the sliding lining is designed to wrap around the steering arm in three dimensions, utilizing the cylindrical or curved surface geometry. This eliminates the need for material removal and preserves the steering arm's structural strength while providing adequate mounting surface area.
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 significantly reduces wear and friction, prevents groove formation, and enhances durability and protection against dirt, maintaining a good visual appearance over time and ensuring reliable operation under high forces.
Implementation Method 1
The sliding coating ensures good power dissipation and low friction thanks to a particularly flat and smooth contact surface
Implementation Method 2
Since the webs are connected by a connecting web around the near end of the steering arm, they are much more stable and can therefore absorb significantly higher forces
Data Source
Figure 1~2
Figure 3~5
AI summary
Corner bearing (3) for the concealed mounting of a sash (2) of a window, door or the like which is pivotable against a frame (1), comprising a frame-side fitting part (4), a sash-side fitting part (5), a link arrangement (8) comprising at least two steering levers (6, 7) pivotable relative to each other about a common axis of rotation (13), with an overlap area (18) of the pivotable steering levers (6, 7) about the common axis of rotation (13) and with pivot bearings (9, 10) for mounting and longitudinal guides (11, 12) for guiding the steering levers (6, 7) in the fitting parts (4, 5) or in the frame (1) or the sash (2), wherein in the overlap area of the pivotable steering levers (6, 7) about the common axis of rotation (13) a sliding surface (14) is arranged between the steering levers (6, 7), which guides a steering lever (6) by means of webs (15, 16) encompasses both long sides.