Steer-by-Wire Gear Layout for High-Rigidity Commercial Steering

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Solution Overview

Problem

Conventional steer-by-wire steering devices are complex, costly, and lack the necessary power and rigidity for commercial vehicles, limiting their application to passenger cars due to the inclusion of hydraulic pressure-related components and low component rigidity.

Innovation Solution

A steer-by-wire steering device with a hollow housing and gear members that amplify torque using a motor, eliminating hydraulic components and enhancing rigidity through a gear system, enabling high power and rigidity suitable for commercial vehicles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If hydraulic pressure-related components are included in the steering device, then high power can be achieved, but engine power is consumed and the structure becomes complex

Engineering Contradiction:

Improvesteering powerVSAvoidengine power consumption

Core Design Contradiction:

PowerVSUse of energy by moving object

Solution Approach 1:

The patent extracts and removes hydraulic pressure-related components from the steering device, replacing them with an electric motor-driven system. This eliminates engine power consumption while maintaining steering functionality through direct electric actuation of the steering mechanism.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the hydraulic mechanical system with an electric motor system. The motor directly drives the steering mechanism through a reduction gear, substituting the hydraulic pressure transmission mechanism with an electric drive mechanism that consumes no engine power.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Power

If conventional worm-worm wheel and rack-pinion structures are used, then steering function is achieved, but component rigidity is low and high power cannot be implemented

Engineering Contradiction:

Improvesteering powerVSAvoidcomponent rigidity

Core Design Contradiction:

PowerVSStrength

Solution Approach 1:

The patent replaces the conventional low-rigidity worm-worm wheel and rack-pinion structures with a motor-driven reduction gear system. This new mechanism provides both the necessary steering power and the component rigidity required for high-power applications in commercial vehicles.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Power

If hydraulic pressure-related components are included, then steering power can be sufficient, but the device complexity increases and costs rise

Engineering Contradiction:

Improvesteering powerVSAvoidsteering device complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates hydraulic pressure-related components from the steering device, thereby reducing structural complexity. The simplified electric motor-driven system maintains sufficient steering power while removing the complex hydraulic infrastructure including pumps, valves, and fluid lines.

Inventive Principle:

Principle #2Taking out (Extraction)

4Power

If the steering device is designed for high power commercial vehicles, then adequate steering capability is achieved, but the structure becomes complex and costly

Engineering Contradiction:

Improvesteering powerVSAvoidmanufacturing simplicity

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent replaces complex hydraulic systems with a more manufacturable electric motor-driven reduction gear system. This substitution simplifies the manufacturing process by eliminating hydraulic component assembly, fluid sealing requirements, and complex mechanical linkages, while still achieving the high power needed for commercial vehicles.

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

The device achieves high power and rigidity without engine power consumption, supporting functions like autonomous parking, lane keeping, and steering vibration attenuation, enhancing driver convenience and fuel efficiency.

Implementation Method 1

rotated by a motor coupled to a side of the housing

Methodology Applied

Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Implementation Method 2

the first gear portion and the second gear portion are engaged with each other

Methodology Applied

Scientific EffectMechanical advantage through gear engagement: Gear

Implementation Method 3

gear members that amplify torque using a motor

Methodology Applied

Scientific EffectMechanical advantage: Mechanical Advantage

Data Source

PatentUS12371095B2Steer-by-wire steering apparatus

Publication Date: 2025.07.29 HL MANDO CORP

AI summary

The present embodiments may provide a steer-by-wire steering apparatus which enables a driver to use a function for controlling an automobile, such as automatic parking, lane keeping, driving assistance according to a road surface condition, steering-vibration damping, or autonomous driving control, to improve the driver's convenience, and allows removal of hydraulic pressure-related components to prevent consumption of engine power by the components and thus can satisfy the high power and rigidity required for a steering device of a commercial vehicle.