Segmented Cam Sleeve Axial Displacement for Cylinder Deactivation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing valve control systems for internal combustion engines require separate actuators and cam sleeves for each cylinder, leading to complexity, error susceptibility, and high costs due to different control times and cam displacement on the camshaft.
Innovation Solution
A cam sleeve with multiple axial sections is used, allowing simultaneous control of multiple cylinders by axial displacement via a single actuator, where cams on the cam sleeve rotate past valves to deactivate them, reducing the need for multiple components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate actuators and cam sleeves are used for each cylinder, then individual cylinder control is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The cam sleeve is divided into multiple axial sections (first axial section and second axial section) that can be independently displaced axially. This segmentation allows different cylinders to be controlled differently while using a single cam sleeve structure, resolving the contradiction by enabling individual control without requiring separate cam sleeves for each cylinder.
Solution Approach 2:
A single actuator is designed to control multiple axial sections of the cam sleeve through a unified control mechanism. This multi-functional actuator can displace different axial sections independently, allowing one actuator to perform the function of multiple separate actuators, thereby reducing device complexity while maintaining individual cylinder control capability.
2Ease of operation
If multiple separate actuators are employed for each cylinder, then precise individual control is achieved, but error susceptibility increases due to more components
Solution Approach 1:
Multiple axial sections are merged into a single cam sleeve structure that is controlled by one actuator. This merging reduces the total number of independent components, thereby reducing error susceptibility while maintaining the ability to control individual cylinders precisely through the unified control mechanism.
Solution Approach 2:
The cam sleeve is segmented into axial sections that can be independently controlled, allowing precise individual cylinder control. However, since these segments are part of a unified structure controlled by one actuator, the system avoids the reliability issues associated with multiple separate actuators while maintaining control precision.
3Adaptability or versatility
If axial displacement of cam sleeve sections is implemented, then valve deactivation is achieved, but mechanical complexity of the cam sleeve structure increases
Solution Approach 1:
The cam sleeve is divided into axial sections that can be independently displaced. This segmentation enables selective valve deactivation for different cylinders by displacing only the relevant axial sections, achieving adaptability while keeping the structural complexity manageable through modular design.
Solution Approach 2:
The cam sleeve axial sections are designed to be dynamically displaceable along the axial direction while maintaining rotational movement. This dynamic capability allows the cam sleeve to switch between active and deactivated states for different cylinders, achieving valve deactivation functionality without requiring completely separate mechanical structures.
Data Source
AI summary
A valve control of an internal combustion engine has a camshaft and a cam sleeve, which surrounds the camshaft and is fastened in an axially movable manner and has cams, which are associated with individual valves and extend in the radial direction. The cam sleeve can be moved in the axial direction in relation to the camshaft by an actuator during rotation. The cam sleeve has at least two axial segments, which can be moved in relation to each other in the axial direction by the actuator, which engages in the axial segments.