Chain Guide Face Channels for Lower Heat and Wear
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Solution Overview
Problem
Existing chain guide and tensioner designs for automotive engines face issues with excessive noise, wear, and heat generation due to metallic materials, and high costs associated with high-heat-resistant materials used in polymeric alternatives.
Innovation Solution
A chain guide and tensioning apparatus featuring a guide body and guide face with spacers that create channels for air and lubricant circulation to reduce heat and friction, allowing lubricant to enter through apertures and circulate between the guide body and guide face, thereby cooling and lubricating the driven chain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metallic materials are used for guide faces, then strength and durability are improved, but noise and heat generation increase
Solution Approach 1:
The patent introduces air and lubricant as intermediary substances that flow through channels in the guide face. These intermediaries reduce direct metal-to-chain contact, thereby reducing noise and heat generation while maintaining the structural strength of the metallic guide face body.
Solution Approach 2:
The guide face incorporates channels that create a porous-like structure, allowing air and lubricant to pass through. This enables cooling and lubrication functions while maintaining the overall structural integrity and strength of the metallic guide face.
2Object-generated harmful factors
If polymeric materials are used for guide faces, then noise and friction are reduced, but heat resistance deteriorates
Solution Approach 1:
The patent uses air and lubricant as intermediaries that flow through channels to actively cool the guide face. This allows the use of polymeric materials with lower inherent heat resistance while maintaining operational temperature through continuous cooling.
Solution Approach 2:
The channels enable continuous flow of cooling air and lubricant through the guide face, providing ongoing cooling action that prevents heat buildup and maintains the guide face within safe operating temperature ranges.
3Temperature
If high heat resistant materials are used for guide faces, then temperature resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs air and lubricant as cooling intermediaries, allowing the use of standard, cost-effective polymeric or metallic materials instead of expensive high-heat-resistant alloys. The cooling function is achieved through the intermediary substances rather than through expensive material selection.
Solution Approach 2:
The patent changes the operational parameters of the guide face by introducing active cooling through channels. This allows standard materials to operate at effective temperatures suitable for the application, eliminating the need for expensive high-heat-resistant materials.
4Temperature
If channels for air and lubricant circulation are added, then heat and friction are reduced, but device complexity increases
Solution Approach 1:
The channels in the guide face serve multiple functions simultaneously: they provide structural support, guide the flow of air and lubricant for cooling, and reduce friction through lubricant delivery. This multi-functionality reduces the need for separate cooling components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The patent merges the cooling function with the guide face structure itself by incorporating channels directly into the guide face body. This integration combines the structural and cooling functions into a single component, reducing the number of separate parts and minimizing the increase in device complexity.
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 effectively reduces noise, wear, and heat generation while potentially using less expensive materials, enhancing the operational efficiency and longevity of the chain guide and tensioner system.
Implementation Method 1
The guide face includes a plurality of spacers that extend therefrom into engagement (contact) with the guide body so as to define at least one channel that is configured to facilitate air and/or lubricant circulation between the guide body and the guide face to reduce heat and friction generated by engagement of the driven chain with the guide face
Implementation Method 2
The guide face includes a plurality of spacers that extend therefrom into engagement (contact) with the guide body so as to define at least one channel that is configured to facilitate air and/or lubricant circulation between the guide body and the guide face to reduce heat and friction generated by engagement of the driven chain with the guide face
Data Source
AI summary
A chain guide and tensioning apparatus is disclosed that is configured for engagement (contact) with a driven chain (e.g., in an automotive engine). The chain guide and tensioning apparatus includes a guide body and a guide face overlying the guide body. The guide face defines an inner surface and an opposite outer surface that is configured to guide and tension the driven chain. The guide face includes a plurality of spacers that extend therefrom into engagement (contact) with the guide body so as to define at least one channel that is configured to facilitate air and/or lubricant circulation between the guide body and the guide face to reduce heat and friction generated by engagement of the driven chain with the guide face.