Sprocket Chain Pin Geometry for Precise Length Control
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Solution Overview
Problem
Existing methods for controlling the chain length of sprocket chains using cylindrical pins with different diameters result in complex adjustments due to deformation of outer link plates, leading to non-uniform changes in functional dimensions.
Innovation Solution
A method involving a pin set with pins having different joint diameters, where the joint diameter differs from the joining diameter, allowing for selection of pins based on required chain length without altering the joining regions, thus minimizing deformation of outer link plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cylindrical pins with different diameters are used to control chain length, then the chain length can be adjusted, but the deformation of outer link plates becomes non-uniform and the adjustment becomes complex
Solution Approach 1:
The pin is divided into two distinct functional regions: a joining region with a first diameter for pressing into outer link plates, and a joint region with a second diameter for engaging inner chain links. This segmentation allows independent optimization of each region's function, enabling precise chain length control without complex adjustments to the entire pin geometry.
Solution Approach 2:
Different regions of the pin are given different local properties: the joining region has a specific diameter optimized for creating consistent deformation in outer link plates, while the joint region has a different diameter optimized for chain length control. This local differentiation resolves the contradiction by allowing each region to perform its specific function optimally without interfering with the other.
2Length of moving object
If pin diameter is changed to control chain length, then chain length adjustment is possible, but the interference fit between openings and pins changes, causing non-uniform deformation
Solution Approach 1:
By segmenting the pin into joining and joint regions with different diameters, the invention isolates the deformation function to the joining region only. The joint region's diameter can be optimized for chain length control without affecting the uniformity of deformation in the outer link plates, as the joining region's geometry is specifically designed to create consistent deformation patterns.
Solution Approach 2:
The joining region is given a specific local quality (diameter) that ensures uniform deformation of outer link plates, while the joint region has a different local quality (diameter) that controls chain length. This local differentiation allows chain length adjustment without compromising deformation uniformity, as each region's properties are independently optimized for its specific function.
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
This approach simplifies and enhances chain length control by reducing the complexity of adjustments and ensuring consistent deformation of outer link plates, leading to more precise and effective chain length management.
Implementation Method 1
A larger diameter of the pin corresponds to a larger excess of the interference fit. The interference fit between the openings and the pins results in the outer link plates being deformed.
Data Source
AI summary
A method for controlling the length of a sprocket chain of a chain type includes alternately arranged inner chain links and outer chain links that are connected together by, means of a chain joint, wherein each outer chain link has two outer plates, each of which comprises two openings and two pins that are pressed into the openings of the outer plates, each pin of the outer chain links having a joint region, which contacts the inner chain link and has a joint diameter, and two joining regions, which are pressed into the openings of the outer plates and have a joining diameter. The method prevents the disadvantages known from the prior art and in particular leads to a simple chain length control. For this purpose, the method has the following steps: providing a pin set comprising a plurality of pins, wherein at least two of the pins of the pin set have different joint diameters in the joint regions; and for at least one of the pins of the pin set; the joint diameter of the joint region differs from the joining diameter of the joining regions; ascertaining the pin joint region diameter required for a specified chain length; selecting the pin with the ascertained joint region diameter from the pin set; pressing the joining regions of the pin into the openings in the outer plates; and completing the sprocket chain. The use of a pin in such a method and to a pin set for such a method is also provided.