Integrated Steering Rotary Unit for Moisture-Resistant Assembly
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Solution Overview
Problem
Existing electric steering devices face complications due to mechanical connections between the steering wheel and pinion shaft, which can lead to structural complexity and moisture ingress, causing mechanical defects.
Innovation Solution
A steering device with a rack housing unit, casing unit, rotary unit, and detection unit manufactured by injection molding, allowing for a simplified assembly structure and prevention of foreign substance ingress through sealing parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical connection between steering wheel and pinion shaft is used, then steering torque transmission is achieved, but structural complexity increases and moisture ingress occurs
Solution Approach 1:
The patent merges the steering wheel, steering shaft, and pinion shaft into a single integrated rotary unit manufactured by injection molding. This eliminates mechanical connections between separate components, preventing moisture ingress at connection points while reducing assembly structure complexity. The integrated design maintains steering torque transmission functionality without requiring traditional mechanical joints.
Solution Approach 2:
The patent replaces the traditional mechanical connection system (steering shaft, universal joints, bearings) with an integrated injection-molded rotary unit. This substitution eliminates mechanical connection points where moisture could ingress while maintaining the essential steering torque transmission function through the integrated structure.
2Ease of manufacture
If multiple separate components are assembled, then functional requirements are met, but assembly complexity and potential defect points increase
Solution Approach 1:
The patent combines multiple functional components (steering wheel, steering shaft, pinion shaft, detection unit mounting structure) into a single integrated rotary unit that can be manufactured by injection molding. This reduces the number of separate components and assembly steps while maintaining all necessary functions, including steering torque transmission and detection unit integration.
Solution Approach 2:
The integrated rotary unit serves multiple functions simultaneously: it transmits steering torque, provides mounting structure for the detection unit, and eliminates the need for separate mechanical connections. This multi-functionality reduces the overall component count while meeting all functional requirements of the steering system.
Data Source
AI summary
A steering device for a vehicle, the steering device including: a rack housing unit; a rack drive unit inserted into the rack housing unit and configured to be movable in an axial direction; a casing unit coupled to the rack housing unit; a rotary unit mounted in the casing unit and configured to engage with the rack drive unit and be rotatable; and a detection unit mounted on the casing unit and configured to measure a rotation of the rotary unit, thereby implementing a degree of shape freedom and simplifying an assembly structure.