Speed Sensor Ring Segmentation for Hydraulic Friction Reduction
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Solution Overview
Problem
Signal inducing devices, such as speed sensor rings, face issues with mechanical energy loss and thermal energy generation due to hydraulic friction when used in hydraulic systems, and existing solutions like elastic bands with magnetic coatings are costly and prone to material agglomeration problems.
Innovation Solution
A signal inducing device with a first and second material exhibiting different magnetic behaviors, arranged to create a smooth magnetic interaction surface, reducing viscous forces and avoiding material agglomeration, using materials like soft and hard magnetic substances or non-magnetic materials, and designed as a ring-like or wheel-like structure for universal application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a toothed wheel made of soft magnetic material is used as a signal inducing device, then the speed can be determined accurately, but hydraulic friction occurs in the oil bath causing significant mechanical energy loss and thermal energy generation
Solution Approach 1:
The signal inducing device is segmented into multiple elements (teeth and gaps) arranged circumferentially. The teeth are made of soft magnetic material for signal generation, while the gaps are filled with non-magnetic material to create a smooth surface that reduces hydraulic friction. This segmentation allows the device to maintain measurement precision while minimizing energy loss in hydraulic environments.
Solution Approach 2:
The signal inducing device uses composite construction combining soft magnetic material for the teeth with non-magnetic material for the gap fillings. This composite structure enables the device to generate accurate magnetic signals while the non-magnetic portions reduce viscous friction forces when rotating in hydraulic oil, thereby reducing mechanical energy loss.
2Loss of energy
If an elastic band with magnetic coating is used as an alternative, then hydraulic friction is reduced, but the device becomes cost intensive to produce and still has surface roughness
Solution Approach 1:
Instead of using a continuous elastic band with coating, the device segments the magnetic property into discrete teeth made of soft magnetic material. The gaps between teeth are filled with non-magnetic material to create a smooth surface. This segmentation approach reduces hydraulic friction while being more cost-effective than elastic band construction and achieving smoother surface finish.
Solution Approach 2:
The invention changes the magnetic property parameter from continuous (elastic band with coating) to discrete (teeth with gaps filled with non-magnetic material). This parameter change allows for a smoother effective surface that reduces hydraulic friction while being more economical to manufacture and easier to produce with controlled surface roughness.
3Stability of the object's composition
If hard magnetic material is used, then the magnetic behavior is stable, but agglomeration of magnetic materials occurs in hydraulic oil leading to potential sensor destruction
Solution Approach 1:
The soft magnetic material is applied locally only to the teeth where magnetic signal generation is needed, while the gaps are filled with non-magnetic material. This local quality differentiation ensures that magnetic properties are concentrated only where required for signal generation, preventing widespread agglomeration in the hydraulic oil while maintaining stable magnetic behavior at the sensor interface.
Solution Approach 2:
Soft magnetic material is used instead of hard magnetic material. Soft magnetic materials do not retain magnetization permanently and do not agglomerate in hydraulic oil, eliminating the risk of sensor destruction from magnetic particle accumulation. The material can be easily applied and removed, making it a safer choice for hydraulic environments.
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 device achieves reduced mechanical energy loss and thermal generation, enhanced smoothness, and cost-effectiveness, while preventing material agglomeration, making it suitable for various operating conditions and fluid environments.
Implementation Method 1
the first material and the second material show a different magnetic behaviour, and wherein the first material and the second material are arranged in a way that the resulting magnetic behaviour of the signal inducing device varies over a magnetic interaction surface
Implementation Method 2
the teeth and the gaps between the teeth produce a hydraulic friction in the oil bath. In particular at higher turning speeds of the axle/toothed wheel, a significant loss of mechanical energy (and consequently an appropriately high generation of thermal energy) will occur
Data Source
AI summary
The invention relates to a signal inducing device (1, 9, 11, 12, 18, 19, 20), comprising a first material (2, 3, 13, 14) and a second material (4, 16). The first material (2, 3, 13, 14) and the second material (4, 16) show a different magnetic behaviour. The first material (2, 3, 13, 14) and the second material (4, 16) are arranged in a way that the resulting magnetic behaviour of the signal inducing device (1, 9, 11, 12, 18, 19, 20) varies over a magnetic interaction surface (5, 10) of the signal inducing device (1, 9, 11, 12, 18, 19, 20). The signal inducing device (1, 9, 11, 12, 18, 19, 20) is designed in a way that the magnetic interaction surface (5, 10) shows an essentially smooth surface, in particular with respect to the standard moving direction of the magnetic interaction surface (5, 10).