Rear Wheel Steering Power Pack With Magnetic Gear Angle Sensing

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Solution Overview

Problem

Existing rear wheel steering systems in vehicles require sensors to measure the displacement of lead screws, which complicates the design and increases manufacturing costs, making it difficult to miniaturize the system.

Innovation Solution

Incorporating a power pack with a motor shaft, main and sub-gears, and magnetic field detection sensors to measure the steering angle of rear wheels, eliminating the need for sensors that measure lead screw displacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If sensors are added to measure lead screw displacement, then steering angle measurement is achieved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvesteering angle measurementVSAvoidsensor configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces mechanical displacement sensors with a magnetic field-based detection system. Magnets are attached to the lead screw and nut, and magnetic sensors detect their relative position to determine steering angle, eliminating the need for complex mechanical sensors while achieving accurate measurement

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The power pack unit is designed to perform multiple functions: it provides steering actuation through the lead screw mechanism and simultaneously measures steering angle through integrated magnetic sensors. This multi-functionality eliminates the need for separate measurement systems, reducing overall device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If sensors are added to measure lead screw displacement, then steering angle measurement is achieved, but manufacturing cost increases

Engineering Contradiction:

Improvesteering angle measurementVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent uses inexpensive magnetic sensors and simple magnet attachments instead of costly mechanical displacement sensors. These magnetic components are low-cost, easily manufactured, and can be readily replaced if needed, significantly reducing manufacturing costs while maintaining measurement accuracy

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

By replacing expensive mechanical sensors with affordable magnetic field-based detection, the patent achieves the same measurement function at a lower cost, making the system more economically viable for production

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If sensors and additional components are added, then steering angle measurement is achieved, but system size increases

Engineering Contradiction:

Improvesteering angle measurementVSAvoidsystem size

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The patent integrates the magnetic sensors and magnets directly into the existing power pack assembly. The sensors are mounted on the power pack housing while magnets are attached to moving components, merging the measurement function into the actuation system without requiring additional space or separate measurement units

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Magnetic field-based sensors have compact form factors compared to mechanical displacement sensors. The patent leverages this advantage to achieve accurate steering angle measurement within the existing power pack volume, avoiding the need for additional space

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 approach simplifies the design, reduces manufacturing costs, and allows for a more compact rear wheel steering apparatus by integrating sensors within the power pack, enhancing vehicle responsiveness and safety.

Implementation Method 1

a main gear rotation detection sensor configured to detect a main gear rotation of the main gear from a change in a magnetic field of the main gear magnet, and a sub-gear rotation detection sensor configured to detect a sub-gear rotation of the sub-gear from a change in a magnetic field of the sub-gear magnet

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS20260062050A1Power pack and rear wheel steering apparatus including the same

Publication Date: 2026.03.05 HYUNDAI MOBIS CO LTD

AI summary

A power pack including a motor shaft, the motor shaft being configured to rotate, a main gear, the main gear being configured to coaxially rotate with the motor shaft, a main gear magnet fixed to the main gear, a sub-gear, the sub-gear being configured to rotate in conjunction with the main gear, a sub-gear magnet fixed to the sub-gear, a main gear rotation detection sensor, the main gear rotation detection sensor being configured to detect a main gear rotation of the main gear from a change in a magnetic field of the main gear magnet, and a sub-gear rotation detection sensor, the sub-gear rotation detection sensor being configured to detect a sub-gear rotation of the sub-gear from a change in a magnetic field of the sub-gear magnet.