Valve Timing Control Spool Guide Surface Design
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Solution Overview
Problem
Existing valve timing control apparatuses have a large direction switch valve and slow response due to the clearance between the check valve components, which affects the efficiency and speed of oil flow control.
Innovation Solution
A valve timing control apparatus with a spool and valve object configuration that eliminates the clearance between the guide surface and valve object, allowing for a downsized direction switch valve and improved check valve response by positioning the valve seat and valve object close to the discharge hole, enabling faster oil pressure variation transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a clearance is defined between the valve body and the valve object of the check valve, then the check valve can be manufactured with standard tolerances, but the size of the check valve and direction switch valve increases
Solution Approach 1:
The invention extracts the clearance requirement from the check valve design by positioning the discharge hole at a location where oil can flow directly to the valve object without requiring a clearance between the valve body and valve object. This eliminates the need for radial clearance while maintaining manufacturability through precise axial positioning of the discharge hole.
Solution Approach 2:
The invention transitions from relying on radial clearance (radial dimension) to using axial positioning of the discharge hole (axial dimension) to achieve proper oil flow control. By opening the discharge hole on the guide surface at a specific axial position, the patent eliminates radial clearance requirements while maintaining functional performance.
2Device complexity
If the valve-closing part of the check valve is arranged at a distance from the discharge hole in the axial direction, then the check valve structure is simplified, but the response time of the check valve increases
Solution Approach 1:
The invention positions the discharge hole at a location where oil pressure changes are transmitted to the valve object before the valve needs to respond. By pre-positioning the discharge hole adjacent to the valve seat on the guide surface, oil pressure variations are immediately transmitted to the valve object, preparing it for rapid opening or closing action without requiring complex spring mechanisms.
3Device complexity
If the discharge hole is positioned away from the valve seat, then oil flow control is simplified, but oil pressure variation transmission to the check valve is delayed
Solution Approach 1:
The invention applies local quality by positioning the discharge hole at a specific location on the guide surface where it directly communicates with the valve object. This localized positioning ensures that oil pressure variations are immediately transmitted to the check valve at the precise location where it is needed, without requiring complex flow control mechanisms throughout the entire valve body.
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
The solution results in a downsized direction switch valve and enhanced check valve response, improving the apparatus's efficiency and speed in controlling valve timing by eliminating the need for clearance and optimizing oil flow control.
Implementation Method 1
The valve object is seated on or separated from the valve seat. When the valve object is seated on the valve seat, the operation oil is restricted from flowing from the discharge port to the supply port.
Data Source
AI summary
A spool has a connection passage that connects a supply port and a discharge port with each other according to a position of the spool in an axial direction. A valve seat is arranged in the connection passage. The connection passage has a supply hole passing through the spool in a radial direction, and a discharge hole passing through the spool in the radial direction. The spool has a guide surface that guides a valve object to move in the axial direction while restricting a position of the valve object in the radial direction. The discharge hole is opened on the guide surface.