Valve Timing Controller Connector Deformation
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Solution Overview
Problem
The existing fluid-pressure-operated valve timing controllers face issues with reduced control accuracy due to axial tension generated by securing the screw part to the camshaft, which can deform the valve part and affect the sliding movement of the spool, leading to lower controllability of the working fluid and valve timing.
Innovation Solution
Incorporating a connector part with reduced strength and rigidity relative to the axial tension, which is designed to deform plastically before the valve part, thereby maintaining the sliding clearance and accuracy of the spool movement, and using a concave portion or through holes to reduce the cross-sectional area and flexural rigidity of the connector part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screw part is securely secured to the camshaft to maintain structural strength, then the connection reliability is improved, but axial tension is transmitted to the valve part causing deformation and reducing control accuracy
Solution Approach 1:
The sleeve is divided into three distinct parts: the valve part held by the vane rotor, the screw part secured to the camshaft, and the connector part linking them. This segmentation allows each part to have optimized properties - the connector part is designed with lower strength and rigidity to deform plastically under axial tension, protecting the valve part from deformation while maintaining connection reliability.
2Stability of the object's composition
If the connector part has high strength and rigidity to prevent deformation, then the structural stability is improved, but the sliding movement of the spool is affected and control accuracy is reduced
Solution Approach 1:
The connector part is designed with locally reduced strength and rigidity compared to the valve part and screw part. This local quality change allows the connector part to deform plastically under axial tension while the valve part maintains its structural integrity and precise sliding movement, thus resolving the contradiction between structural stability and control accuracy.
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 solution enhances the controllability and accuracy of the valve timing by allowing the connector part to deform instead of the valve part, maintaining minimal sliding clearance and ensuring reliable control of the hydraulic fluid flow, thus improving the overall control accuracy of the valve timing.
Implementation Method 1
the connector part has a strength or rigidity relative to the axial tension, and the strength or rigidity of the connector part is lower than that of the valve part
Implementation Method 2
A rotation phase of the vane rotor relative to the housing is controlled by a flow of the hydraulic fluid
Implementation Method 3
The control valve controls the flow of the hydraulic fluid relative to the operating chamber by controlling an axial movement of the spool
Data Source
AI summary
A fluid-pressure-operated valve timing controller has a control valve that is disposed in a vane rotor and a camshaft. The control valve has a sleeve and a spool moving in an axial direction in the sleeve. The sleeve includes: a valve part held by the vane rotor; a screw part coaxially secured to the camshaft in a state where an axial tension is generated; and a connector part that connects the valve part and the screw part with each other in the axial direction. A strength or rigidity of the connector part relative to the axial tension is lower than that of the valve part.