Magnet Ring Vulcanized on Support Ring for Thermal Expansion
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Solution Overview
Problem
Rotating bodies with alternating magnetization face challenges in stability and precision due to temperature variations and differing expansion properties of magnetic rings and hub materials, leading to potential fractures and the need for additional machining to meet roundness requirements.
Innovation Solution
A magnet ring is fixed rotationally and axially onto a stable support ring made of magnetizable material using vulcanizing, with a self-centering friction locking band for precise mounting on the hub, allowing for temperature expansion compensation and eliminating direct gluing or mounting on the hub.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the magnet ring is directly glued onto the hub, then the mounting process is simplified, but temperature variations cause different expansion properties between the magnetic ring and hub material, leading to high tensions and potential fractures
Solution Approach 1:
A support ring made of magnetizable material is introduced as an intermediary component between the magnet ring and the hub. This support ring serves as a mediator that absorbs thermal expansion differences, preventing direct stress transmission between the magnet ring and hub during temperature variations, thereby eliminating the fracture risk while maintaining manufacturing simplicity
2Device complexity
If the magnet ring is mounted directly on the hub, then the number of components is reduced, but additional machining is required after gluing to meet high precision roundness requirements
Solution Approach 1:
The support ring is pre-machined with precise dimensions and roundness requirements before assembly. By preparing the support ring in advance with the required precision, the magnet ring can be mounted without requiring additional precision machining after assembly, thus reducing overall device complexity while maintaining manufacturing precision
3Reliability
If the magnet ring is vulcanized onto the support ring, then form stability is improved and temperature expansion is compensated, but the mounting process becomes more complex
Solution Approach 1:
The magnet ring is made from vulcanizeable filler material containing magnetic particles, changing the material parameter to enable vulcanizing as the mounting method. This material transformation allows the magnet ring to be firmly attached to the support ring while maintaining elasticity to absorb thermal expansion, achieving form stability without significantly complicating the mounting process
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 method enables a simple, cost-effective manufacturing process with enhanced form stability and elastic properties, ensuring long service life and precise centering without additional machining, allowing for versatile hub configurations and reduced risk of fracture.
Implementation Method 1
the vulcanizeable material of the magnet ring is sufficiently elastic, in order to absorb the expansion of the support ring due to temperature changes, which differs from the expansion relative of the magnet ring
Implementation Method 2
the slide-on ring is fixated through providing a self-centering connection device, e.g. one or plural friction locking elements, in particular a friction locking band, between the outer diameter of the hub and the inner diameter of the support ring
Data Source
AI summary
For so-called pole wheels, as they are used for angle detection through magnetic field sensors, centering is facilitated and the service life of the pole wheel is increased by fixating the magnet ring rotationally and disengageable through sliding it on a prefabricated hub through a mounting device, which is disposed there between, like e.g. a friction locking band.