Chain Transmission Plate Segmentation for Friction Reduction
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Solution Overview
Problem
Conventional timing chain systems face excessive contact pressure and reduced durability due to reduced contact area between the chain and guides, leading to increased friction loss and potential durability issues.
Innovation Solution
A chain transmission system with plates of varying backside heights and radii of curvature, where specific plates contact either a guide with a large or small radius of curvature, optimizing contact area and pressure to reduce friction loss while maintaining durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the contact area between the chain and guides is reduced to reduce friction loss, then friction loss is reduced, but contact pressure becomes excessive and durability is compromised
Solution Approach 1:
The chain is segmented into inner plates and outer plates with different backside heights. Inner plates have larger backside heights to contact guides with small radii of curvature, while outer plates have smaller backside heights to contact guides with large radii of curvature. This segmentation allows different parts of the chain to interact differently with guides, distributing contact pressure and reducing friction loss simultaneously.
Solution Approach 2:
Different plates are given different local qualities through varying backside heights. Inner plates are designed with larger backside heights for specific guide contacts, while outer plates have smaller backside heights for other guide contacts. This local differentiation optimizes the contact characteristics at each specific location along the chain path.
2Force
If only inner plates contact the guides to reduce the number of contacting plates, then slide resistance is reduced, but contact pressure per area increases excessively
Solution Approach 1:
The chain plates are segmented into inner plates and outer plates that share the guiding function. Both inner and outer plates are designed to contact guides, but at different locations and under different conditions. This segmentation distributes the contact pressure across more plates and guide surfaces, reducing the pressure per contact area while maintaining low slide resistance.
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 system achieves reduced friction loss in power transmission without compromising the durability of the chain guide mechanism or the chain, ensuring stable chain movement and balanced contact with guides.
Implementation Method 1
a chain transmission including a chain (110) having a plurality of plates and a chain guide mechanism (170) that guides the chain in sliding contact therewith
Data Source
AI summary
A chain transmission is provided which is capable of reducing friction loss in the transmission of power without the risk of compromising the durability of a chain guide mechanism and the chain. The chain transmission includes a chain and a chain guide mechanism. The chain guide mechanism includes a first guide and a second guide having a smaller radius of curvature than that of the first guide. The plurality of plates include a first plate and a second plate. The first plate has a backside height set such that the first plate does not contact the first guide when the first plate is guided by the first guide and such that the first plate contacts the second guide when the first plate is guided by the second guide.