Variable Valve Timing Oil Control Valve Vibration Isolation
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Solution Overview
Problem
Existing variable valve timing systems face challenges in managing the position relationship between the vehicle body frame and the oil control valve, as well as the effects of engine vibration and heat, leading to potential durability issues and increased vehicle size.
Innovation Solution
A variable valve timing system is designed with the oil control valve positioned on the outer surface of the cylinder, close to the engine's center of gravity, and an oil pipe that crosses the cam chain chamber, allowing for hydraulic pressure control without increasing the vehicle's width and improving durability by reducing vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the oil control valve is disposed on the outer surface of the cylinder head, then the valve timing control can be achieved, but the vehicle body frame size increases and vibration effects worsen
Solution Approach 1:
The oil path is routed through the cam chain chamber walls (outer wall and inner wall) rather than extending externally, utilizing the third dimension (depth/thickness of chamber walls) to convey hydraulic pressure. This eliminates the need for external oil passages that would increase vehicle width, while maintaining effective oil delivery to the variable valve device.
2Ease of operation
If the oil control valve is disposed on the outer surface of the cylinder head, then the valve timing control can be achieved, but the durability decreases due to vibration transmission
Solution Approach 1:
The cam chain chamber walls (outer wall and inner wall) serve as intermediary structures that conduct hydraulic pressure from the oil control valve to the variable valve device. By routing the oil path through these structural walls rather than exposed external passages, the system protects the hydraulic control pathway from vibration damage while maintaining functional effectiveness.
3Area of stationary object
If the oil path extends through the cam chain chamber walls, then the vehicle size is reduced, but the oil path complexity increases
Solution Approach 1:
The cam chain chamber walls serve multiple functions: they contain the cam chain mechanism, provide structural support, and simultaneously function as hydraulic conduits for oil delivery. By making the chamber walls multi-functional, the patent eliminates the need for separate external oil passages, reducing vehicle width without adding dedicated oil path components.
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 configuration reduces the transmission of vibrations to the oil control valve, enhances its durability, and prevents an increase in vehicle size by utilizing the cam chain chamber's walls for the oil path, ensuring efficient operation and maintainability.
Implementation Method 1
an oil control valve configured to control a hydraulic pressure with respect to the variable valve device
Implementation Method 2
An oil path for hydraulic pressure control enters the outer wall of the cam chain chamber from the oil control valve, and after extending toward a side of the cylinder head from a side of the cylinder, the oil path extends toward the variable valve device through an inner wall of the cam chain chamber through the oil pipe
Data Source
AI summary
There is provided a variable valve timing system for an engine in which a cam chain chamber is formed in a cylinder and a cylinder head, the variable valve timing system including: a variable valve device configured to change an opening and closing timing of a valve; an oil control valve configured to control a hydraulic pressure with respect to the variable valve device. The oil control valve is disposed on an outer surface of the cylinder, which is an outer wall of the cam chain chamber. An oil path enters the outer wall of the cam chain chamber from the oil control valve, and after extending toward a side of the cylinder head from a side of the cylinder, the oil path extends toward the variable valve device through an inner wall of the cam chain chamber through an oil pipe.