Variable Valve Timing: Oil Control Valve Placement for Frame Clearance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing variable valve timing systems face issues with the position relationship between the vehicle body frame and the oil control valve, affecting mountability and disposability, and the oil control valve's durability due to vibration transmission.
Innovation Solution
The oil control valve is detachably positioned on the outer surface of the engine, away from the vehicle body frame, allowing for improved shape freedom and reduced vehicle size, while being closer to the engine's center of gravity to minimize vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oil control valve is disposed on the outer surface of the cylinder head, then the variable valve timing system can be implemented, but the vehicle body frame design freedom is restricted and vehicle size increases
Solution Approach 1:
The patent relocates the oil control valve from the traditional position on the cylinder head outer surface to the bottom surface of the engine. This spatial repositioning in a different dimension (from vertical/side mounting to horizontal/bottom mounting) allows the vehicle body frame to be designed with greater freedom while maintaining the variable valve timing system's functionality. The oil control valve is positioned in an area below the cylinder head that is not occupied by the vehicle body frame structures (main frame and down frame), thus resolving the spatial conflict.
2Reliability
If the oil control valve is disposed on the outer surface of the cylinder head, then the variable valve timing system can be implemented, but mountability and disposability of the engine are deteriorated
Solution Approach 1:
The patent separates the oil control valve from the vehicle body frame structure by positioning it on the engine's bottom surface rather than integrating it with the frame. This segmentation allows the engine to be mounted or dismounted as a complete unit without interfering with the vehicle body frame assembly, thereby improving ease of manufacture and maintenance. The oil control valve becomes part of the engine assembly rather than the frame assembly, simplifying the mounting process.
3Reliability
If the oil control valve is disposed on the outer surface of the engine, then the variable valve timing system can be implemented, but vibration transmission to the oil control valve increases and durability decreases
Solution Approach 1:
The patent utilizes the engine block itself as an intermediary or damping medium between the vibration source and the oil control valve. By positioning the oil control valve on the bottom surface of the engine rather than directly on the cylinder head, the engine structure acts as a buffer that absorbs and dampens vibrations before they reach the oil control valve. This intermediary positioning reduces the direct transmission of harmful vibrations, thereby improving the durability of the oil control valve while maintaining system functionality.
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 enhances the oil control valve's durability and maintains engine mountability by reducing interference with the vehicle frame and minimizing vibration, thus improving the system's overall performance.
Implementation Method 1
an oil control valve configured to control the hydraulic pressure with respect to the variable valve device
Implementation Method 2
the variable valve device switches between a cam for low-speed rotation and a cam for high-speed rotation to adjust an opening and closing timing of a valve
Data Source
Figure 1
Figure 2
Figure 3
AI summary
There is provided a variable valve timing system for an engine in which a cylinder head is fixed on a cylinder, and the cylinder head is suspended on a vehicle body frame, the variable valve timing system including: a variable valve device configured to change an opening and closing timing of a valve according to a hydraulic pressure; and an oil control valve. The vehicle body frame includes a main frame configured to laterally cover a rear side of the cylinder head and a down frame configured to laterally cover a front side of the cylinder head. In a side view of a vehicle, the oil control valve is detachably disposed on an outer surface of the engine below an area surrounded by the main frame, the down frame, and a lower surface of the cylinder head.