Cam Phaser Sleeve for Sealing and Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cam phasers for internal combustion engines face challenges in securing positioning and sealing during assembly and operation, as well as achieving quick and reliable adjustment of the camshaft, due to inadequate sealing and fluid separation between components.
Innovation Solution
A sleeve is designed to be arranged between the central valve and rotor, providing fluid separation and form locking with the rotor, featuring safety elements for secure positioning and axial extension over operating connections, allowing for reliable sealing and quick adjustment of the camshaft without requiring precise machining of the rotor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sleeve is used to provide fluid separation and sealing between the supply channel and operating connections, then sealing reliability is improved, but the complexity of assembly and positioning increases
Solution Approach 1:
The patent combines multiple functions into the sleeve component: fluid separation, sealing, and form locking are integrated into a single sleeve structure. The first and second safety elements are incorporated directly into the sleeve, eliminating the need for separate positioning components and simplifying assembly while maintaining reliable sealing.
Solution Approach 2:
The sleeve acts as an intermediary component between the central valve and the rotor, providing fluid separation and sealing. The safety elements on the sleeve mediate the positioning function, ensuring correct assembly without requiring complex machining of the rotor itself.
2Manufacturing precision
If the sleeve extends axially over the operating connections to ensure proper positioning, then positioning accuracy is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The sleeve is designed with predetermined axial extension that covers the operating connections, establishing correct positioning before final assembly. The safety elements are pre-positioned on the sleeve to guide correct installation, eliminating the need for high-precision machining of the rotor and reducing manufacturing complexity.
3Reliability
If form locking is implemented between the sleeve and rotor for secure positioning, then reliability of positioning is improved, but the device complexity increases
Solution Approach 1:
The form locking mechanism is integrated into the sleeve structure itself through the safety elements, rather than being a separate component. The first safety element provides circumferential form locking while the second safety element provides axial form locking, combining multiple positioning functions into the sleeve's design.
4Productivity
If the radial recesses are sealed relative to each other for effective through flow, then fluid flow efficiency is improved, but the sealing complexity increases
Solution Approach 1:
The sleeve serves as an intermediary sealing element between the radial recesses, providing the necessary seal to enable effective through flow. By positioning the sleeve with form locking safety elements, the sealing function is achieved without requiring complex sealing mechanisms, as the sleeve's position ensures proper sealing of the fluid paths.
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 sleeve ensures secure positioning and sealing, facilitating quick and reliable adjustment of the camshaft, reducing the risk of incorrect mounting and fluid leakage, while allowing for efficient hydraulic fluid exchange, thus optimizing the operation of internal combustion engines.
Implementation Method 1
the sleeve is configured flowable and so that form locking is formable between the sleeve and the rotor
Implementation Method 2
the rotor is movable by pressures that are provided in the first pressure chamber and in the second pressure chamber
Implementation Method 3
a supply channel configured to supply hydraulic fluid
Data Source
AI summary
A sleeve for a cam phaser, wherein the sleeve is arranged between a central valve and a rotor of the cam phaser, wherein the rotor is rotatable relative to a stator of the cam phaser about a rotation axis of the rotor, wherein a vane of the rotor is arranged positionable between two bars of the stator, wherein the vane divides an intermediary space that is formed between the two bars into a first pressure chamber and a second pressure chamber, wherein the rotor is movable by pressures that are provided in the first pressure chamber and in the second pressure chamber, wherein the central valve is configured to provide pressure loading and pressure relief of the first pressure chamber and the second pressure chamber.