Steering Angle Sensor Protective Housing Sealing
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Solution Overview
Problem
Steering angle sensors in vehicles are exposed to contaminants such as grease, water, snow, mud, and dust, which can adversely impact their performance and accuracy in detecting rotary motion of the steering column.
Innovation Solution
A protective housing assembly comprising a case, a cover, and a gasket is mounted to the gearbox housing, forming an interior space that encloses the steering angle sensor and includes a mating spline to engage the pinion shaft, ensuring the sensor detects rotational motion while being sealed from contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the steering angle sensor is mounted directly in the steering gearbox, then the sensor can detect rotational motion of the pinion shaft, but the sensor is exposed to contaminants such as grease, water, snow, mud, and dust which adversely impact its performance and accuracy
Solution Approach 1:
The invention divides the sensor mounting structure into separate components: a protective housing that encloses the sensor and a gearbox housing that contains the pinion shaft. These housings are connected through a coupling mechanism that allows rotational motion transmission while maintaining physical separation and contamination protection. This segmentation enables the sensor to remain isolated from contaminants while still detecting pinion shaft rotation accurately.
Solution Approach 2:
The invention introduces a coupling mechanism as an intermediary between the pinion shaft and the steering angle sensor. This coupling includes a drive shaft extending from the protective housing and a coupling connection that engages with the pinion shaft. The intermediary coupling transmits rotational motion from the pinion shaft to the sensor without direct exposure, allowing the sensor to detect rotation while remaining protected from grease, water, and other contaminants.
2Reliability
If a protective housing is added to enclose the sensor, then the sensor is protected from contaminants, but the device complexity increases due to additional components such as case, cover, gasket, and coupling mechanism
Solution Approach 1:
The invention combines the protective housing components (case and cover) into a unified enclosure structure that completely surrounds the sensor. The case and cover are joined together to form an integrated protective housing that eliminates gaps and exposure points. This merging of components simplifies the overall structure while maintaining comprehensive protection, reducing the number of separate parts needed compared to a fragmented protective design.
Solution Approach 2:
The invention implements a nested structure where the sensor is enclosed within the protective housing, which itself is connected to the gearbox housing through the coupling mechanism. The drive shaft extends from the protective housing to engage the pinion shaft, creating a nested arrangement of protective layers. This nesting provides multiple levels of protection while maintaining a compact overall structure that does not excessively increase device complexity.
3Reliability
If the protective housing is sealed to prevent contaminant ingress, then the sensor reliability improves, but the ease of manufacture decreases due to sealing requirements and assembly complexity
Solution Approach 1:
The invention incorporates sealing elements (gaskets or seals) that are pre-installed on either the case or cover before final assembly. This preliminary placement of sealing components ensures proper positioning and eliminates the need for complex sealing procedures during final assembly. The sealing surfaces are designed with predetermined geometries that guide proper alignment, reducing assembly difficulty while maintaining effective contamination protection.
Solution Approach 2:
The invention uses flexible gaskets or sealing films between the case and cover to create an effective seal. These flexible sealing elements can accommodate minor manufacturing tolerances and assembly variations, providing reliable contamination protection without requiring extremely precise manufacturing. The flexibility of these thin film seals simplifies the assembly process compared to rigid sealing methods, as they can be compressed or deformed to achieve proper sealing contact.
Data Source
AI summary
A steering angle sensor assembly for a vehicle steering gearbox can include a protective housing mounted to a housing of the steering gearbox and a steering angle sensor. The protective housing can include a case, a cover and a gasket connected to each other such that the case, the cover and the gasket form an interior space with the gasket sandwiched between the case and the cover. Each of the case and the cover can include an opening configured to receive a pinion shaft of the steering gearbox when the steering angle sensor assembly is mounted on the housing. The steering angle sensor can be secured in the interior space of the protective housing and can engage the pinion shaft when the protective housing is mounted to the housing and the pinion shaft is received by the opening in each of the case and cover.