Valve Spring Guide for High-Speed Engine Durability
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Solution Overview
Problem
High-revolution speed in four-cycle internal combustion engines causes valve springs to deform laterally, hindering smooth operation and reducing durability.
Innovation Solution
A tubular spring guide supports the outer periphery of the valve spring, positioning its top end above the valve guide to prevent lateral deformation, combined with a disc-shaped spring seat and oil discharge ports to enhance support and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine operates at high revolution speed, then power output increases, but the valve spring contracts deformingly in the lateral direction reducing durability
Solution Approach 1:
A tubular spring guide is introduced as an intermediary component between the valve spring and the valve guide. This spring guide supports the outer periphery of the valve spring, preventing lateral deformation during high-speed operation while allowing the engine to maintain high power output. The spring guide acts as a mediator that corrects the deformation issue without reducing engine performance.
2Device complexity
If a valve spring is used without additional support, then the structure is simple, but the valve spring cannot contract straight at high revolution speed
Solution Approach 1:
The tubular spring guide serves as a minimal yet effective intermediary structure that provides lateral support to the valve spring. It is positioned within the existing valve guide structure, adding stability for straight contraction without significantly increasing overall device complexity. The spring guide extends only where needed to support the spring outer periphery.
Solution Approach 2:
The spring guide adds a radial dimension of support to the valve spring system. While the valve spring originally only had axial support from the valve guide, the spring guide provides radial constraint, preventing lateral deformation. This dimensional addition stabilizes the spring contraction path without complicating the basic structure.
3Volume of moving object
If the top end of the spring guide is positioned at the same level as the valve guide, then the structure is compact, but lateral deformation of the valve spring cannot be prevented
Solution Approach 1:
The spring guide extends in the axial dimension beyond the valve guide top end, creating an overlapping region where the spring is supported both axially by the valve guide and radially by the spring guide. This extended positioning in the axial dimension ensures lateral deformation prevention while maintaining compact overall structure.
Solution Approach 2:
The spring guide is positioned to extend above the valve guide top end, providing preliminary radial support to the valve spring before the spring reaches the valve guide. This preliminary support prevents lateral deformation from occurring in the first place, rather than correcting it after deformation begins.
Data Source
AI summary
A four-cycle internal combustion engine with a valve system having improved durability in the case of high revolution speed. The engine includes a cylinder head having a port, and a valve having a stem part continuous with a fillet part for opening or closing the port. A valve spring including inner and outer springs urges the valve in a direction to close the port. A valve guide holds the stem part slidably. A tubular spring guide supports an outer periphery part of an outer spring to prevent lateral deformation of the spring. A top end of the spring guide is positioned above a top end of a valve guide.