In-Wheel Motor Lock Nut Speed Sensing With Integrated Magnet
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Solution Overview
Problem
Conventional vehicle speed sensing apparatuses for in-wheel motor vehicles face design constraints due to installation on hub bearings, leading to increased work processes and interference with other parts, and require separate seals and complex shape sensing mechanisms.
Innovation Solution
An apparatus that measures the rotation speed of a lock nut part driven by the in-wheel motor, utilizing a magnet part and speed sensor to calculate vehicle speed, allowing for increased design freedom and reduced part count by integrating the magnet directly onto the lock nut and using a ring-shaped connection part to simplify assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional speed sensing apparatus is installed on a hub bearing, then vehicle speed can be measured, but the number of work processes increases and interference with other parts occurs
Solution Approach 1:
The patent combines the speed sensing function with the lock nut structure by integrating the magnet directly onto the lock nut, eliminating the need for separate sensing components mounted on hub bearings. This merging reduces the number of work processes and assembly steps while maintaining accurate vehicle speed measurement capability.
2Measurement precision
If a conventional speed sensing apparatus is installed on a hub bearing, then vehicle speed can be measured, but interference with other parts occurs
Solution Approach 1:
By merging the speed sensing function into the lock nut assembly, the patent eliminates spatial conflicts with other components. The magnet is positioned on the lock nut where it does not interfere with surrounding parts, thereby maintaining measurement precision while increasing design freedom and adaptability in the overall wheel assembly layout.
3Measurement precision
If prominences and depressions are formed on a gear to sense wheel speed, then speed measurement is achieved, but installation space increases
Solution Approach 1:
The patent extracts the speed sensing mechanism from the gear structure and relocates it to the lock nut. By using a magnet attached to the lock nut rather than forming prominences and depressions on the gear, the design reduces the installation space required while maintaining accurate wheel speed sensing capability.
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 solution enhances design flexibility and productivity by eliminating the need for separate magnet parts and reducing the number of components, while preventing bearing movement and ensuring accurate vehicle speed measurement.
Implementation Method 1
a magnet part having a magnetic force, and fixed to the connection part
Data Source
AI summary
An apparatus for measuring a speed of a vehicle having an in-wheel motor including a lock nut part fixed to an outer portion of a rotation shaft rotated by receiving power of the in-wheel motor, and restricting movement of a bearing part positioned outside the rotation shaft; a connection part coupled to the lock nut part; a magnet part having a magnetic force, and fixed to the connection part; and a speed sensor part installed to be separated from the magnet part, and measuring rotations of the magnet part.