Valve Operation Control System Compact Holder Design
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Solution Overview
Problem
The existing valve operation control systems for internal combustion engines face challenges with sealing properties due to the need for large cross-sectional areas to accommodate multiple oil passages, leading to complex machining and size increases, and interference issues when using multiple spool valves.
Innovation Solution
A valve operation control system that integrates a holder with a housed and projecting portion, featuring a pair of spool valves with parallel axes and independent oil passages, allowing for compact design and enhanced sealing by reducing the cross-sectional area of the holder and simplifying machining and oil passage formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cross-sectional area of the holder is increased to accommodate multiple oil passages, then the number of oil passages can be increased, but the sealing properties of the seal face deteriorate
Solution Approach 1:
The holder is divided into two separate components: the valve body and the holder proper. The valve body contains all oil passages and is connected to the holder via a flange connection. This segmentation allows oil passages to be concentrated in the valve body rather than requiring a large cross-sectional area of the holder, thereby maintaining seal face quality while accommodating multiple oil passages.
Solution Approach 2:
A flange connection serves as an intermediary between the valve body and the holder. This flange provides a separate sealing interface that allows the holder to maintain its original cross-sectional area and sealing properties, while the valve body handles the complexity of multiple oil passages. The flange acts as a mediator that decouples the sealing requirement from the oil passage accommodation requirement.
2Device complexity
If a single spool valve is used to control multiple oil passages, then the number of components is reduced, but the spool valve size and machining complexity increase
Solution Approach 1:
Instead of using a single large spool valve to control multiple oil passages, the system uses multiple smaller spool valves (first and second spool valves). Each spool valve controls a specific set of oil passages. This segmentation reduces the size and machining complexity of each individual spool valve while maintaining the ability to control all necessary oil passages.
Solution Approach 2:
The oil passages are arranged in different spatial dimensions and levels within the valve body. The first and second spool valves control oil passages at different heights and locations. By utilizing three-dimensional space for oil passage routing, the system avoids the need for a single oversized spool valve and allows multiple smaller spool valves to efficiently manage the hydraulic control.
3Ease of manufacture
If multiple spool valves are used to control oil passages, then machining complexity is reduced, but the overall size increases due to space requirements for additional components
Solution Approach 1:
The first and second spool valves are arranged vertically one above the other within the valve body. The oil passages are routed through different vertical levels, allowing the spool valves to be nested in the vertical dimension rather than requiring horizontal spacing. This nesting arrangement minimizes the overall volume of the hydraulic control means while accommodating multiple spool valves with simplified machining.
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 design enhances sealing properties, reduces the size of the valve body, minimizes hydraulic pressure loss, and simplifies the formation and machining of oil passages, while maintaining high mounting rigidity and compactness.
Implementation Method 1
an electromagnetic open/close valve for controlling hydraulic pressure of the pilot hydraulic chamber
Implementation Method 2
a spool valve formed by slidably housing a spool valve body in a valve body
Data Source
AI summary
A valve operation control system for an internal combustion engine in which hydraulic pressure applied to a valve operation mode changing mechanism is controlled by hydraulic pressure control means that is formed from a holder mounted on a cylinder head, a spool valve formed by slidably housing a spool valve body in a valve body, and an electromagnetic open/close valve for controlling hydraulic pressure of a pilot hydraulic chamber, wherein the holder (109) is formed by integrally connecting a housed portion (109a) and a projecting portion (109b) by means of a connection portion (109c), the housed portion (109a) being housed between the cylinder head (22R) and a head cover, the projecting portion (109b) projecting outside the cylinder head (22R) and the head cover and having the electromagnetic open/close valve (113, 114) mounted thereon, a seal face (116) with the head cover is formed on the connection portion (109c), and the valve body (110) is provided so as to be connected to the housed portion (109a) while being housed between the head cover and the cylinder head (22R). This enables the sealing properties between the holder and the head cover to be enhanced.