Chain Transmission with Spatial Pin Links for Synchronized Sprocket Speeds
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Solution Overview
Problem
Existing chain transmission systems fail to achieve the same rotational speed for toothed driving and driven sprockets of different diameters while transmitting power through a single chain.
Innovation Solution
A chain transmission system comprising two toothed sprockets and a tensioner, where the chain consists of links connected by three pins, with the center of the driven sprocket's pitch circle outside the inscribed circle of the chain, allowing for synchronized rotation of sprockets with different diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional chain transmission uses sprockets of different diameters, then power transmission is achieved, but the rotational speeds of driving and driven sprockets differ
Solution Approach 1:
The chain link is divided into multiple plates (first plate, second plate, third plate) connected by pins, allowing each component to be optimized independently. This segmentation enables the creation of a complex spatial structure that can accommodate different sprocket diameters while maintaining synchronized rotation
Solution Approach 2:
The invention transitions from a planar chain structure to a three-dimensional spatial structure. The pins are arranged in different planes, creating a spatial configuration that allows the chain to engage with sprockets of different diameters while maintaining the same rotational speed through the geometric relationship defined by the pin arrangements
2Adaptability or versatility
If the chain length is increased to accommodate different sprocket diameters, then power transmission between different sprockets is enabled, but the chain tension control becomes difficult
Solution Approach 1:
The invention changes the geometric parameters of the chain link, specifically the arrangement of pins in different planes and the relative positions of plates. This parameter change allows the chain to adapt to different sprocket diameters while maintaining proper tension through the geometric constraints built into the link structure
3Ease of manufacture
If a standard chain structure is used, then manufacturing is simple, but it cannot achieve synchronized rotation of sprockets with different diameters
Solution Approach 1:
By segmenting the chain link into separate plates and pins that can be assembled independently, the invention maintains manufacturing simplicity while achieving the complex spatial configuration needed for synchronized rotation of different diameter sprockets
Solution Approach 2:
The chain link employs asymmetric arrangement of pins in different planes and plates at different orientations. This asymmetry is precisely what enables the chain to engage with sprockets of different diameters while maintaining synchronized rotation, breaking the symmetry that would otherwise require equal diameter sprockets
Data Source
AI summary
A chain transmission containing two toothed sprockets, a chain and a tensioner where the center (S) of the pitch circle of the driven sprocket (2) lays outside of the circle inscribed by the part of chain (4) mating with the driven sprocket (2). Each link (5,6) of the chain (4) contains plates (7) connected by three pins (8 and 9), while the axis of one of the pin (9) lays outside of the plane determined by axes of the remaining pins (8) of the link (5, 6).