Cam Chain Guide Extending Beyond Winding Termination
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Solution Overview
Problem
Conventional internal combustion engines face challenges in reducing the load on cam chain tensioners and improving the durability of tensioner lifters, as the cam-chain dropout preventing member does not effectively control cam chain behaviors and vibrations.
Innovation Solution
The design incorporates a driving-sprocket cam chain guide that extends beyond the winding termination point of the cam chain to guide it towards the cam chain tensioner, reducing the load on the tensioner and enhancing its durability by preventing outward deflection and vibrations, while allowing for separate assembly and maintenance of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cam chain tensioner is used to control cam chain vibrations, then the cam chain behaviors are controlled, but the load on the tensioner increases and durability of the tensioner lifter decreases
Solution Approach 1:
The invention divides the cam chain control function into two separate components: a guide body that guides the cam chain along the driving sprocket, and a tensioner that only provides tensioning force. This segmentation allows the guide body to handle the majority of cam chain behavior control, reducing the load on the tensioner and improving lifter durability.
Solution Approach 2:
The guide body acts as an intermediary component between the cam chain and the tensioner. It controls cam chain vibrations and behaviors through its guiding surface, preventing these forces from being transmitted directly to the tensioner and lifter, thereby reducing their load and improving durability.
2Reliability
If the cam chain guide extends beyond the winding termination point to the chain moving surface of the tensioner, then cam chain vibrations are controlled and load on tensioner is reduced, but the device complexity increases
Solution Approach 1:
The guide body is designed to perform multiple functions: it guides the cam chain along the driving sprocket, controls cam chain vibrations, prevents outward deflection, and directs the cam chain to the tensioner's chain moving surface. By consolidating these functions into a single component, the invention reduces overall device complexity while achieving effective vibration control and load reduction.
Data Source
AI summary
In an internal combustion engine including a driving-sprocket cam chain guide 70 for guiding a cam chain 47 along a driving sprocket 45, as viewed in a crankshaft axial direction, a guide body 71 of the driving-sprocket cam chain guide 70 extends beyond a winding termination point P of the cam chain 47 on the driving sprocket 45 to a position adjacent to a chain moving surface 51c of a cam chain tensioner 51, on which the cam chain 47 slides. The engine provides a cam-chain dropout preventing function to the cam chain guide, thus reducing load on the cam chain tensioner and improving durability of the tensioner lifter.