Rotating Sensor Shell Venting for Cooling and Water Drainage
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Solution Overview
Problem
Existing sensor assemblies in vehicles face challenges in efficiently cooling and managing water ingress while maintaining a clear field of view and structural integrity, particularly for rotating sensor units on stationary housings.
Innovation Solution
A sensor assembly design featuring a rotatable cylindrical shell with an integrated gutter positioned below the lower edge, which directs airflow for cooling and drains away water, combined with a bracket and pressurized-air source for efficient airflow management and fluid drainage, ensuring minimal airflow loss and unobstructed view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotatable sensor unit is mounted on a stationary housing, then the sensor can maintain a 360° field of view, but airflow for cooling may escape and water may ingress through the gap between the rotating and stationary components
Solution Approach 1:
The housing is segmented into a stationary housing and a rotatable sensor unit that can independently move relative to each other. This segmentation allows the sensor unit to rotate for 360° coverage while the stationary housing maintains the gutter and airflow management structures, resolving the contradiction between adaptability and protection.
2Reliability
If a gutter is positioned below the rotatable sensor unit to drain water, then water ingress is prevented, but the structural complexity of the assembly increases
Solution Approach 1:
The gutter is merged with the stationary housing structure, forming an integrated water management system. The gutter extends along the lower edge of the sensor unit and is structurally combined with the housing, providing drainage functionality without requiring separate complex drainage components, thus reducing overall structural complexity while maintaining reliability.
3Adaptability or versatility
If the cylindrical shell extends above the housing for 360° rotation, then the sensor unit achieves full coverage, but airflow for cooling the sensor may be lost
Solution Approach 1:
The gutter acts as an intermediary structure between the rotating sensor unit and the stationary housing. It defines an airflow outlet that channels cooled air back toward the sensor unit, mediating the airflow path to prevent energy loss despite the rotation capability enabled by the extended cylindrical shell.
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 design effectively cools the sensor unit, manages water ingress, and maintains a 360° field of view by minimizing airflow escape and fluid entry, enhancing the operational reliability and performance of rotating sensors.
Implementation Method 1
a pressurized-air source positioned to discharge airflow between the arms and then through the airflow outlet
Implementation Method 2
The gutter defines an airflow outlet from the housing radially inside the gutter relative to the axis. The sensor unit defines an airflow inlet radially inside the lower edge relative to the axis and positioned to receive airflow from the airflow outlet.
Implementation Method 3
The gutter is elongated along the lower edge and positioned directly below the lower edge relative to the axis
Data Source
AI summary
A sensor assembly includes a housing, a sensor unit attached to the housing, and a gutter fixed relative to the housing. The sensor unit includes a cylindrical shell defining a vertical axis. The cylindrical shell extends above a highest point of the housing. The cylindrical shell is rotatable around the axis relative to the housing. The cylindrical shell includes a lower edge and extending upward along the axis from the lower edge. The gutter is elongated along the lower edge and positioned directly below the lower edge relative to the axis. The gutter defines an airflow outlet from the housing radially inside the gutter relative to the axis. The sensor unit defines an airflow inlet radially inside the lower edge relative to the axis and positioned to receive airflow from the airflow outlet.