Integrated Hub Magnetic Encoder for Wheel Speed Sensing
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Solution Overview
Problem
Existing wheel speed measuring devices require a separate encoder ring and inner seal, which increases costs and may not achieve sufficient magnetic density for stable electric current values, limiting their sensitivity and performance.
Innovation Solution
An integrated wheel speed measuring device with a magnetic encoder configured inside a hub, where the encoder's area is increased by adjusting the hub's depth, and a sealed structure is maintained using an O-ring assembly with the wheel cap, eliminating the need for a separate encoder ring and inner seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a separate encoder ring is used, then the encoder can be installed on the wheel bearing, but the device complexity increases and costs increase
Solution Approach 1:
The encoder is integrated directly into the hub body, merging the encoder structure with the hub. This eliminates the need for a separate encoder ring and its associated mounting components, thereby reducing device complexity and manufacturing costs while maintaining the encoder's functionality for detecting wheel speed and rotation direction
2Reliability
If the encoder area is increased to increase magnetic density, then the sensing value stability improves, but the hub depth must be increased
Solution Approach 1:
The encoder is positioned in a recessed portion of the hub at an optimized depth that maximizes the encoder area for magnetic density while considering the hub's overall depth constraints. By carefully designing the recessed portion's depth and the encoder's positioning within it, the solution achieves sufficient magnetic density for stable sensing values without requiring excessive hub depth
3Reliability
If the wheel sensor is assembled with the wheel cap, then the sealed structure is maintained, but additional components like O-ring are required
Solution Approach 1:
An O-ring is introduced as an intermediary sealing component between the wheel sensor and the wheel cap. This O-ring maintains the sealed structure of the bearing assembly, preventing contamination while allowing the wheel sensor to be properly assembled and positioned within the wheel cap structure
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 solution enhances magnetic density, satisfies target sensing values, reduces costs by integrating the encoder with the hub, and maintains a sealed bearing structure, improving the device's performance and reliability.
Implementation Method 1
The magnetic encoder includes iron oxides that are magnetized to N/S poles on rubber. The N poles and the S poles are repeatedly disposed in a ring shape.
Data Source
AI summary
An integrated wheel speed measuring device according to an exemplary embodiment of the present invention includes: a hub which is installed inside a wheel bearing; a magnetic encoder which is installed by being inserted into a recessed portion that is provided in one surface of the hub; and a wheel cap which surrounds the one surface of the hub and the recessed portion, in which the magnetic encoder has a cylindrical shape, and is installed in the recessed portion in a longitudinal direction thereof.