D-Profile Chain Link Bevel Transition for Hoist Bending Resistance
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Solution Overview
Problem
Existing hoist chains with D-profile steel sections face a trade-off between maximizing cross-sectional area for high bending resistance and vibration resistance, while maintaining efficient running behavior and storage efficiency, as sharp edges or small radii lead to reduced tensile force and fatigue strength.
Innovation Solution
The chain link features a bevel surface inclined at 10° to 30°, with a chamfered transition area between side flanks and the outer surface, allowing for improved sliding into chain guides and reduced material cone formation, minimizing cross-sectional loss and maintaining high bending resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the transition area between side flanks and outer peripheral surface is designed with a sharp edge or very small rounding radius, then the cross-sectional area is maximized and bending resistance moments are increased, but the running behavior deteriorates and vibration resistance decreases
Solution Approach 1:
The transition area is divided into multiple surface segments: a first bevel surface with a first bevel angle (10°-30°) and a second bevel surface with a second bevel angle (5°-20°), separated by a rounding radius. This segmentation allows each segment to fulfill different functions - the first bevel surface optimizes strength while the second bevel surface improves running behavior
Solution Approach 2:
Different geometric properties are applied to different regions of the transition area. The first bevel surface has a steeper angle for strength optimization, while the second bevel surface has a gentler angle for improved running behavior, and both are connected by a specific rounding radius to eliminate stress concentrations
2Area of moving object
If the transition area is designed with a sharp edge, then the cross-sectional area is maximized, but the chain requires larger chain store space due to material cone formation
Solution Approach 1:
Instead of using a sharp edge that creates material cone formation requiring larger storage space, the invention inverts the approach by using bevel surfaces that slope inward, reducing the material cone effect and allowing more compact chain store configuration while maintaining cross-sectional area
3Ease of manufacture
If the transition area is designed with a sharp edge, then manufacturing is simplified, but fatigue strength is reduced
Solution Approach 1:
A rounding radius is introduced at the transition area between the bevel surfaces and the outer peripheral surface. This curvature eliminates sharp edges that act as stress concentration points, significantly improving fatigue strength while the bevel surfaces maintain manufacturing simplicity through standard machining operations
Data Source
AI summary
A chain member (1) made of a d-profile steel section, that can particularly be used for a hoisting gear chain, comprises a substantially planar outer circumferential surface (3) and two side flanks (4, 5) ending in the circumferential surface, wherein each side flank comprises a planar flank section (6, 7) that is perpendicular in relation to the outer circumferential surface (3). The flank section (6, 7) is connected on each side flank (4, 5) to an outer circumferential surface (3) via a planar chamfer surface (9, 10) that adjoins the flank section, is angled towards the other side flank (5, 4) at a chamfer angle (a) in a slanted manner relative to said section.