Segmented Chain Guide Rail with Continuous Opening
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Solution Overview
Problem
Existing guide rails for chain drives in internal combustion engines face challenges in reducing material usage and installation space constraints, particularly due to downsizing of engines, which complicates the accommodation of tensioning and guide rails.
Innovation Solution
A tensioning or guide rail design featuring a support structure with a continuous opening from front to rear, allowing for a narrow non-contact section that can accommodate adjacent components, and arcuate cheeks for enhanced bending stiffness and force distribution, enabling closer proximity to engine contours while minimizing material usage and optimizing installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the support structure is made narrow or includes cutouts to reduce material usage, then the amount of material used is reduced, but the structural strength and stability are compromised
Solution Approach 1:
The support structure is divided into multiple discrete support elements (first support element and second support element) spaced apart from each other, rather than using a continuous solid structure. This segmentation reduces material usage while maintaining structural function through the distributed support arrangement
Solution Approach 2:
The support elements extend in the width direction of the guide rail, perpendicular to the primary load direction. By utilizing the width dimension for support element arrangement, the design achieves structural strength without requiring excessive material in the load-bearing direction
2Object-generated harmful factors
If the guide rail is designed with spaced-apart contact sections to reduce friction, then friction is reduced, but the installation space requirements increase due to the need for recessed sections
Solution Approach 1:
The guide rail is segmented into distinct contact sections (first and second contact sections) with a non-contact section between them. This segmentation creates natural friction reduction zones without requiring additional recessed sections, as the support elements themselves define the contact regions
Solution Approach 2:
The support elements serve multiple functions: they provide structural support, define the spacing between contact sections, and create the non-contact region. This multi-functionality eliminates the need for separate recessed sections that would otherwise be required to achieve friction reduction
3Area of stationary object
If the non-contact section is made narrow to accommodate installation space constraints, then installation space is optimized, but the structural stability and force distribution are compromised
Solution Approach 1:
The non-contact section contains discrete support elements rather than a continuous structure, allowing the guide rail to be narrow in the width direction for installation space optimization while maintaining structural stability through the distributed support provided by multiple elements
Solution Approach 2:
The support elements feature arcuate upper sides with convex curvature that matches the chain's path. This curvature distributes contact forces more evenly across the support elements, enhancing structural stability in the narrow non-contact section by optimizing force distribution along the chain's trajectory
Data Source
AI summary
A tensioning or guide rail for a chain drive, in particular for a chain drive of an internal combustion engine, comprises two spaced-apart contact sections and one non-contact section arranged therebetween, the contact sections each having a sliding surface which is adapted to be brought into contact with a chain, and the non-contact section interconnecting the two contact sections as a support structure. Such a rail is to be configured such that the installation space available can be utilized more advantageously. To this end, the support structure of the non-contact section comprises an opening extending continuously from a front to a rear of the tensioning or guide rail and separating the contact sections provided with the sliding surfaces. The invention also relates to an endless drive of the type in question.