Control Valve Camshaft Adjuster Spring Support Integration
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Solution Overview
Problem
Existing control valves for camshaft adjusters in internal combustion engines require additional material and production steps to support the spring element, increasing costs and complexity, particularly due to the need for a separate spring receptacle and solid construction.
Innovation Solution
The control sleeve is designed with a base that serves as an axial contact surface for the spring element, eliminating the need for a separate support and using a recess for positive locking, allowing the casing to act as both a guide and stabilization aid, and potentially supporting a non-return valve, with a construction that can be produced using non-cutting methods like deep-drawing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate spring receptacle is used to support the spring element, then the spring element is reliably supported, but the device complexity and material costs increase
Solution Approach 1:
The spring receptacle function is merged with the control sleeve by forming an axial base directly on the control sleeve that serves as the contact surface for the spring element. This eliminates the need for a separate spring receptacle component while maintaining reliable spring support.
Solution Approach 2:
The control sleeve is given multiple functions: it guides the control piston, provides sealing surfaces, and now also serves as the spring support structure through its integrated base. This multi-functionality reduces the total number of components needed in the system.
2Reliability
If a solid spring receptacle is provided in the casing, then the spring element is supported, but additional material and production steps are required
Solution Approach 1:
The spring support function is combined with the control sleeve manufacturing process. The base is formed as an integral part of the control sleeve using non-cutting methods like deep-drawing, eliminating the need for separate solid receptacle fabrication and assembly steps.
Solution Approach 2:
The manufacturing method changes from cutting/solid formation to non-cutting deformation processes. The deep-drawing process forms the base by plastic deformation of the control sleeve material, which is more economical and simpler than machining solid receptacles from separate materials.
3Ease of manufacture
If the control sleeve is made with a base for spring support, then production is simplified and costs are reduced, but the structural integrity must be maintained
Solution Approach 1:
The manufacturing process parameters are optimized for non-cutting methods. The deep-drawing process uses controlled plastic deformation that maintains material strength while forming the base geometry, avoiding the stress concentrations that would result from cutting or machining operations.
Solution Approach 2:
The base is designed with specific local geometry and thickness distribution to provide adequate spring support while maintaining overall control sleeve strength. The axial base form provides localized reinforcement where needed without compromising the structural integrity of the entire control sleeve.
Data Source
AI summary
A control valve (4) for controlling pressure medium flows of a camshaft adjuster, which control valve includes a substantially hollow cylindrical control sleeve (6), which is disposed inside a casing (8), and a control piston (12) which is guided axially displaceably inside the control sleeve (6) against the spring force of a spring element (14), the control sleeve (6) having at one axial end a base (22) which serves as an axial contact surface for the spring element (14).