Rack-and-Pinion Steering Gear Assembly via Pinion Shaft Segmentation
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Solution Overview
Problem
The existing assembly methods for rack-and-pinion steering systems, particularly those with electrically assisted systems, face difficulties in connecting the steering pinion and rack due to the placement of the servo motor between the input shaft and steering pinion, making the assembly process cumbersome.
Innovation Solution
A method involving a pinion shaft with a narrowed portion of a smaller diameter than the steering pinion, allowing the rack to be easily inserted past the pinion shaft into the steering gear housing, followed by engagement with the steering pinion, and subsequent installation of the reduction gear, facilitating a straightforward assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the servo motor is placed between the input shaft and steering pinion in electrically assisted rack-and-pinion steering systems, then steering assistance is provided, but the assembly of the steering pinion and rack becomes difficult
Solution Approach 1:
The pinion shaft is segmented into two distinct parts: a first pinion shaft portion and a second pinion shaft portion. This segmentation allows the rack to be assembled by passing it through the narrowed section of the pinion shaft, enabling easy installation while maintaining the servo motor arrangement for steering assistance.
Solution Approach 2:
The pinion shaft features a localized narrowed section with a smaller diameter than the main body of the pinion shaft. This local quality change creates a passage for the rack while maintaining the structural integrity and functional dimensions of the pinion gear teeth, resolving the assembly difficulty without compromising steering assistance capability.
2Adaptability or versatility
If a traditional multi-piece steering gear housing is used, then assembly flexibility is maintained, but the overall size and weight increase
Solution Approach 1:
The steering gear housing is designed as a single integrated piece that accommodates both the pinion shaft assembly and the rack. This merging of housing components eliminates the need for multiple separate housing pieces, reducing overall weight and complexity while the narrowed portion of the pinion shaft provides the necessary assembly flexibility.
3Reliability
If multiple sealing interfaces are used in the steering gear housing, then component protection is improved, but assembly complexity and potential leak points increase
Solution Approach 1:
The steering gear housing is formed as a single-piece structure that integrates all housing functions, eliminating the need for multiple housing components and their associated sealing interfaces. This reduces assembly complexity and potential leak points while maintaining component protection through the unified housing design.
Data Source
AI summary
A method for assembling a rack-and-pinion steering gear may involve introducing a steering pinion into a housing opening of a steering gear housing such that a region of a narrowed portion of a pinion shaft is situated at a level of a rack to be inserted, introducing the rack into the housing opening of the steering gear housing such that the rack is pushed past the narrowed portion of the pinion shaft into a setpoint position, and moving the pinion shaft farther into the steering gear housing to an end position such that a toothing region of the rack enters into engagement with a toothing of the steering pinion.