Rotating Sensor Assembly Brush Seal for Cooling Airflow Control
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Solution Overview
Problem
Existing sensor assemblies in vehicles face challenges in efficiently cooling and managing water while maintaining a clear field of view and preventing airflow and debris from entering the sensor unit, especially when the sensor unit rotates relative to the housing.
Innovation Solution
A sensor assembly design featuring a brush with bristles that spans the gap between a rotating sensor unit and a stationary housing, combined with a gutter and adjustable connecting members, to minimize airflow loss and debris entry, while ensuring efficient cooling and water management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sensor unit rotates relative to the housing, then the field of view coverage is improved, but airflow escape and debris ingress occur through the gap
Solution Approach 1:
A brush assembly with bristles is introduced as an intermediary element between the rotating sensor unit and stationary housing. The bristles flexibly span the gap, allowing rotational motion while blocking airflow and debris from entering the sensor unit through the gap.
Solution Approach 2:
The brush assembly functions as a flexible barrier that can deform with the rotational motion of the sensor unit. The bristles act as a flexible membrane structure that maintains sealing effectiveness while accommodating the relative motion between rotating and stationary components.
2Loss of energy
If the gap between the sensor unit and housing is reduced, then airflow escape is minimized, but cooling efficiency deteriorates
Solution Approach 1:
The brush assembly serves as a flow control intermediary that directs airflow along a predetermined path. It prevents short-circuiting of cooling air through the gap while maintaining adequate gap size for heat dissipation, thus balancing airflow containment with cooling effectiveness.
Solution Approach 2:
The brush assembly segments the airflow path into a controlled cooling channel and a blocked gap region. This segmentation allows the system to maintain larger gaps for thermal management while preventing harmful airflow escape through strategic flow path division.
3Reliability
If a brush assembly is added to prevent debris ingress, then protection is improved, but device complexity increases
Solution Approach 1:
The brush assembly is a relatively simple intermediary component that provides effective debris protection without requiring complex mechanical structures. Its flexible nature allows it to accommodate rotational motion passively, reducing the need for additional actuators or complex sealing mechanisms.
Solution Approach 2:
The brush assembly changes the physical parameters of the gap region by introducing a flexible barrier with specific bristle density and length. This parameter-based approach provides effective sealing through material properties rather than complex geometric configurations, simplifying the overall structure.
4Object-affected harmful factors
If the brush bristles are made longer to block debris, then protection is improved, but airflow resistance increases
Solution Approach 1:
The brush assembly implements local quality variation by having bristles of different lengths or densities in different regions. Longer bristles are positioned where debris protection is critical, while shorter bristles are used in regions where airflow resistance must be minimized, optimizing the balance between protection and flow efficiency.
Solution Approach 2:
The brush bristles are designed with sufficient length to provide adequate debris protection without being excessively long. This partial action approach uses just enough bristle length to block debris effectively while maintaining acceptable airflow characteristics, avoiding the diminishing returns of overly long bristles.
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 reduces airflow escape and debris ingress, maintains a clear field of view, and enhances cooling efficiency for rotating sensor units, thereby improving the performance and reliability of vehicle sensors.
Implementation Method 1
The brush is fixed to one of the housing or the sensor unit. The bristles extend across the gap toward the other one of the housing or the sensor unit
Implementation Method 2
The shell is rotatable around the axis relative to the housing
Implementation Method 3
The aperture defines an airflow outlet from the housing radially inside the aperture relative to the axis
Data Source
AI summary
A sensor assembly includes a housing, a sensor unit attached to the housing, and a brush having a plurality of bristles. The sensor unit includes a shell defining a vertical axis. The shell is rotatable around the axis relative to the housing. The shell includes a lower edge and extends upward from the lower edge. The housing includes an aperture centered on the axis. The aperture defines an airflow outlet from the housing radially inside the aperture 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 aperture. The aperture and the lower edge define a gap extending around the axis. The brush is fixed to one of the housing or the sensor unit. The bristles extend across the gap toward the other one of the housing or the sensor unit.