Steering Dust Cap with Slits and Angled Floor for Moisture Discharge
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Solution Overview
Problem
Conventional dust caps for steering systems fail to effectively prevent the introduction of foreign substances and moisture into the rack housing along the pinion shaft, leading to rust, vibration, and noise issues that can cause accidents during vehicle operation.
Innovation Solution
A dust cap design with an accommodation hole higher than the first and second rims, featuring slits and vent holes aligned with the rotational axis, and a rubber dust packing with a wrinkled surface to direct foreign substances and moisture away from the pinion shaft, coupled to the dashboard with a floor surface angled to facilitate discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dust cap structure is used, then the structure is simple, but foreign substances and moisture can be introduced into the rack housing along the pinion shaft
Solution Approach 1:
The dust cap is divided into multiple functional segments: a main body portion, a first rim forming a first cavity, a second rim forming a second cavity, and a dust packing component. This segmentation allows each part to perform specific protective functions, creating multiple barriers against foreign substances and moisture while maintaining a modular structure that doesn't excessively increase complexity.
Solution Approach 2:
A dust packing component is introduced as an intermediary element between the dashboard and the dust cap. This dust packing fills the space between the first rim and the dashboard, creating an additional sealing barrier that prevents foreign substances and moisture from entering along the pinion shaft, thereby enhancing protection without requiring a complete redesign of the dust cap structure.
2Reliability
If the accommodation hole is higher than the rims, then foreign substances and moisture are discharged more effectively, but the structure becomes more complex
Solution Approach 1:
The accommodation hole is positioned at a higher vertical dimension than the first and second rims, creating a height difference that enables gravitational discharge of foreign substances and moisture. This dimensional arrangement allows the hole to serve dual purposes: accommodating the pinion shaft at lower levels while providing a elevated discharge path at higher levels, effectively using vertical space to achieve protective function.
Solution Approach 2:
Different regions of the dust cap are assigned different heights and functions: the first rim and second rim form cavities at lower levels for structural support and dust packing accommodation, while the accommodation hole is positioned higher to provide discharge functionality. This local variation in height creates specialized zones that collectively enhance protection while maintaining overall structural efficiency.
3Reliability
If slits and vent holes are added to the dust cap, then discharge functionality is improved, but manufacturing complexity increases
Solution Approach 1:
The discharge functionality is segmented into two types of openings: slits formed in the second rim and vent holes formed in the first cavity. This segmentation allows each type of opening to serve specific discharge purposes - slits for lateral discharge paths and vent holes for vertical discharge - while enabling manufacturing processes to target each feature type with appropriate methods, potentially simplifying overall fabrication.
Solution Approach 2:
The dust cap structure is designed to perform multiple functions through its various features: the first rim and second rim provide structural support, the dust packing provides sealing, the slits provide discharge paths, and the vent holes provide additional discharge pathways. This multi-functionality is achieved within a single integrated component design, reducing the need for additional separate parts and potentially simplifying manufacturing by combining functions into one piece.
Data Source
AI summary
A dust cap for a steering system is disclosed. A dust cap for a steering system, which has an accommodation hole for accommodating a pinion shaft and of which the lower part is coupled to a rack housing, according to an embodiment of the present invention comprises: a floor surface which extends from the upper part toward the outer side of the accommodation hole; a first rim forming a lateral wall on the edge of the floor surface; a second rim forming an intermediate wall between the first rim and the accommodation hole; and one or more slits insert-formed from the second rim toward the floor surface.