Camshaft Adjuster Contact Element Hardness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic actuating devices for camshaft adjustment face issues with adhesion forces between the core region and actuating member, especially in low-temperature ranges and after prolonged vehicle idle times, which affect switching times and wear resistance, and existing solutions either compromise on efficiency or increase material stress.
Innovation Solution
The electromagnetic actuating device is designed with a core region constructed in multiple parts, featuring a contact element with higher hardness than the core body, which influences the contact surface geometry and magnetic field lines, reducing adhesion forces while enhancing wear resistance and efficiency by optimizing the air gap and repulsion force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the contact surface area between core region and actuating member is reduced to decrease adhesion force, then adhesion force is reduced, but surface pressure and material stress increase
Solution Approach 1:
The core region is designed with non-uniform magnetic conductivity distribution, where the first region has higher magnetic conductivity than the second region. This local quality differentiation allows the magnetic flux to concentrate in specific areas, enabling effective magnetic actuation while maintaining larger contact surfaces that reduce both adhesion force and surface pressure.
2Reliability
If harder material is used for core region to increase wear resistance, then wear resistance is improved, but magnetic flux conduction deteriorates
Solution Approach 1:
The core region employs local quality differentiation with distinct magnetic conductivity zones. The first region possesses higher magnetic conductivity to ensure efficient flux conduction where needed, while the second region has lower magnetic conductivity. This spatial variation in material properties allows the core to maintain both good wear resistance and adequate magnetic flux conduction capabilities.
Solution Approach 2:
The core region functions as a composite structure with regions of different magnetic conductivity. This composite approach combines materials or material states that have different magnetic properties, allowing the overall core region to achieve a balance between wear resistance and magnetic flux conduction that neither homogeneous material could provide alone.
3Volume of stationary object
If coil device size is reduced to optimize installation space, then installation space is reduced, but electromagnetic actuation efficiency decreases
Solution Approach 1:
The core region's non-uniform magnetic conductivity distribution creates localized flux concentration zones that enhance the effectiveness of the magnetic actuation. This allows a smaller coil device to generate sufficient magnetic force for actuation, as the flux is strategically directed through high-conductivity regions, maintaining actuation efficiency while reducing overall device size.
Solution Approach 2:
The differentiated magnetic conductivity structure accelerates magnetic flux propagation through the high-conductivity first region, allowing the magnetic field to reach the actuating member more efficiently. This 'rushing through' of flux through optimized pathways compensates for the reduced coil size, maintaining actuation speed and efficiency despite the smaller electromagnetic device.
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 configuration achieves improved wear resistance and efficiency with minimal switching times, allowing for a smaller coil device and reduced installation space, while minimizing adhesion forces and optimizing the magnetic field for enhanced performance.
Implementation Method 1
an electromagnetic actuating device (1) for actuating an actuating member (2) in a motor vehicle, in particular for adjusting a camshaft (12), with a coil device (29) and a magnetic core region (5)
Implementation Method 2
which, with the aid of the coil device (29), the actuating member (2) with permanent magnet means (6) can be adjusted
Implementation Method 3
the field line course of the magnetic field lines in the core body surrounding the contact element in sections is influenced in a targeted manner, in particular bundled in a preferably annular region adjacent to the contact element
Implementation Method 4
in the currentless state, an adhesion force acts between the core region of the actuating member of the armature. This adhesion force is intensified by the oil, situated in the adjustment unit, which collects between the contact surfaces
Data Source
AI summary
The invention relates to an electromagnetic actuating device (1) for a camshaft adjustment device of an internal combustion engine of a motor vehicle, with an elongated actuating element (2) forming an engagement region on the end side and movable by the force of a coil device (29) provided in a stationary manner, which actuating element preferably has in parts a cylindrical covering contour and penetrates a cut-out (8) in permanent magnet means (6) arranged on the shell side, which are constructed for cooperating with a stationary core region (5) comprising a core body (15), and which actuating element lies in a switching position with a contact surface (11), on the end side on the actuating element side, against a contact surface (10) on the core region side. Provision is made that the contact surface (11) on the core region side is formed at least in part by a contact element (16) fixed in the core body (15), which contact element is constructed from a material which has a greater hardness than the material of the core body (15).