Ultrasound Sensor Decoupling Ring Lip Design
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Solution Overview
Problem
Ultrasonic sensors used in motor vehicles face issues with structure-borne noise transmission due to the filling material escaping and making contact with the housing, affecting sound pressure and measurement accuracy.
Innovation Solution
A decoupling ring with a lip design is implemented between the membrane pot and housing, creating a gap to prevent the filling material from contacting the housing, made of damping materials like rubber-elastic materials, which reduces vibration transmission and enhances sound pressure and measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the membrane pot is filled with damping filling material to obtain rapid oscillation, then the ringing time is reduced, but the filling material may escape and contact the housing causing structure-borne noise transmission
Solution Approach 1:
The decoupling ring acts as an intermediary element between the membrane pot and the housing. It includes a lip that extends into the housing to create a containment space, preventing the filling material from contacting the housing while maintaining the damping function for rapid oscillation decay
Solution Approach 2:
The decoupling ring segments the internal space of the housing into two distinct regions: a first space for the filling material enclosed by the lip, and a second space between the lip and housing wall. This segmentation prevents contamination while preserving damping functionality
2Duration of action of moving object
If the filling material contacts the housing to provide damping, then oscillation decay is improved, but vibration transmission to the housing increases
Solution Approach 1:
The decoupling ring with its lip structure serves as a mediator that allows the filling material to perform damping function within the enclosed first space while preventing direct contact with the housing, thus eliminating the harmful vibration transmission pathway
3Adaptability or versatility
If manufacturing tolerances vary causing filling material to escape, then assembly flexibility is improved, but vibration transmission control deteriorates
Solution Approach 1:
The decoupling ring with its lip is installed beforehand to create a preventive barrier. The lip extends into the housing to form a containment structure that anticipates and prevents potential filling material escape due to manufacturing tolerances, ensuring vibration transmission is blocked regardless of assembly variations
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 solution increases sound pressure for measuring larger distances, reduces ringing time for shorter distance measurements, and allows for uniform decay times, while maintaining current production processes and minimizing unwanted vibrations.
Implementation Method 1
the decoupling ring is made of a damping material. A rubber-elastic material, for example, is suitable as a material for producing the decoupling ring
Implementation Method 2
A piezo element is usually used as the sound transducer
Implementation Method 3
a sound pulse is sent from the ultrasonic sensor, which is reflected by an object in the vicinity of the motor vehicle
Implementation Method 4
the membrane pot is filled with a filling material that has a damping effect
Data Source
Figure 1
AI summary
The invention relates to an ultrasound sensor for sending and/or receiving ultrasound signals, comprising a diaphragm cup (3) having a transducer (11) and a housing (7), wherein the diaphragm cup (3) is releasably connected to the housing (7), a decoupling ring (13) is accommodated between the membrane cup (3) and the housing (7), and the membrane cup (3) is filled with a filling material (15). The decoupling ring (13) comprises a lip (27) that is designed in such a way that a gap (31) is formed between the lip (27) and the housing inner wall and the filling material (15) is accommodated in a space at the decoupling ring (13), which space is enclosed by the membrane cup (3) and the lip (27). The invention further relates to a use of the ultrasound sensor.