An ultrasonic sensor
Patent Information
- Application Number
- CN202522218625.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-21
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-10-21
AI Technical Summary
进入壳体与硅胶的水分，温度低时水分结冰会严重影响传感器的性能
[0014]探芯分别与外胶圈、内胶圈通过胶圈干涉夹紧探芯外侧产生摩擦力以固定，胶圈干涉具有较高的压缩率，可以保证水分无法进入探芯与外胶圈以及探芯与内胶圈的接触面。内胶圈顶部圆环形结构塞入小支架与壳体的间隙，并通过胶圈干涉保证水分无法进入小支架与内胶圈的接触面以及内胶圈与壳体的接触面。内胶圈底面与壳体局部在探芯轴向进行干涉，进一步保证水分无法进入内胶圈与壳体的接触面，从而能够实现完全防水，阻止水分及水蒸气进入壳体与胶圈之间，生产效率高，能适应大批量生产。通过加大压缩率，也可以忽略公差和温度的影响。
Smart Images
Figure CN224745137U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of intelligent driving technology, and in particular to an ultrasonic sensor. Background Technology
[0002] Since ultrasonic radar needs to be installed on the car bumper and connected to the vehicle's wiring harness, the ultrasonic radar probe must ensure its own sealing to avoid insufficient sealing causing the sensor to malfunction and affecting signal conduction and transmission with the vehicle body.
[0003] In related technologies, the front end of an ultrasonic radar structure only uses a compression ring to squeeze the housing for waterproofing, but the compression rate is low, for example, 5%-10%, which is insufficient for complete waterproofing. Moisture or water vapor can still enter between the housing and the silicone sealant. Furthermore, considering manufacturing tolerances and the effects of temperature and humidity on the thermal expansion and contraction of the housing and silicone, moisture can easily penetrate. The rear end of an ultrasonic radar structure typically uses a sealant-filled housing to prevent water from entering the sensor cavity. Moisture that enters the housing and silicone sealant can freeze at low temperatures, severely affecting sensor performance. Utility Model Content
[0004] To address the aforementioned technical problems, this application provides an ultrasonic sensor, comprising: a probe, an outer rubber ring, an inner rubber ring, a small bracket, a housing, a printed circuit board assembly (PCBA), and a top cover;
[0005] The probe core is fixed by the frictional force generated when it is clamped to the outside of the probe core due to interference between the probe core and the outer rubber ring; the probe core is fixed by the frictional force generated when it is clamped to the outside of the probe core due to interference between the probe core and the inner rubber ring.
[0006] The small bracket is fixed to the housing by a snap-fit mechanical fastening. The top annular structure of the inner rubber ring is located in the gap between the small bracket and the housing, and the top annular structure of the inner rubber ring partially interferes with the small bracket and partially interferes with the housing.
[0007] The bottom surface of the inner rubber ring interferes with a portion of the housing along the probe axis. Under the pressure of the small bracket fastening the housing, the bottom surface of the inner rubber ring and the portion of the housing are fixed by clamping the probe axis during interference.
[0008] Optionally, the bottom surface of the inner rubber ring is an annular structure, and the annular structure interferes with a portion of the shell surface to form a water-retaining wall.
[0009] Optionally, the inner wall of the outer rubber ring and the outer wall of the probe core partially interfere with each other and are in line contact.
[0010] Optionally, the inner wall of the inner rubber ring partially interferes with the outer wall of the probe core, and the outer wall of the inner rubber ring is in line contact with the inner wall of the housing.
[0011] Optionally, the annular structure at the top of the inner rubber ring interferes with the small bracket in a partial surface contact.
[0012] Optionally, the top cover and the housing are assembled by laser welding.
[0013] The technical solution provided in this application has the following advantages compared with the prior art:
[0014] The probe core is clamped to the outer and inner rubber rings via interference, generating friction to secure it. This interference provides a high compressibility, preventing moisture from entering the contact surfaces between the probe core and the outer and inner rubber rings. The annular structure at the top of the inner rubber ring is inserted into the gap between the small support and the housing, again preventing moisture from entering the contact surfaces between the small support and the inner rubber ring, and between the inner rubber ring and the housing. Local interference between the bottom surface of the inner rubber ring and the housing along the probe core's axial direction further prevents moisture from entering the contact surface between the inner rubber ring and the housing, achieving complete waterproofing and preventing moisture and water vapor from entering between the housing and the rubber rings. This method offers high production efficiency and is suitable for mass production. By increasing the compressibility, the effects of tolerances and temperature can be ignored. Attached Figure Description
[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 A schematic diagram showing the path of moisture entering the components of an existing ultrasonic sensor;
[0018] Figure 2 This is a schematic diagram of the overall structure of the ultrasonic sensor according to an embodiment of this application;
[0019] Figure 3 This is a partial schematic diagram of the ultrasonic sensor component according to an embodiment of this application;
[0020] Figure 4 This is a partial schematic diagram of the ultrasonic sensor component according to an embodiment of this application;
[0021] Figure 5This is a partial schematic diagram of the ultrasonic sensor component according to an embodiment of this application;
[0022] Figure 6 This is a schematic diagram of the assembly of the ultrasonic sensor cover and housing in an embodiment of this application;
[0023] Figure 7 This is a schematic diagram of the ultrasonic sensor cover structure in an embodiment of this application;
[0024] Figure 8 This is a structural diagram of the assembled ultrasonic sensor according to an embodiment of this application. Detailed Implementation
[0025] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0026] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.
[0027] See Figure 1 , Figure 1 This diagram illustrates the path of moisture entering the components of an existing ultrasonic sensor. The front end of the existing ultrasonic sensor mainly includes: a probe core 01, an outer rubber ring 02, an inner rubber ring 03, a small support 04, and a housing 05. The small support 04 and the housing 05 are mechanically assembled, and gaps exist at the joints between the components, allowing moisture to enter the product along these gaps. Analysis shows that moisture enters through the gaps between components primarily via... Figure 1 The image shows four paths: a, b, c, and d. Therefore, during the structural design, the sensor's front end is waterproofed by sealing these four water inlet paths.
[0028] See Figure 2 , Figure 2 This is a schematic diagram of the structure of an ultrasonic sensor according to an embodiment of this application. The ultrasonic sensor includes: a probe 11, an outer rubber ring 12, an inner rubber ring 13, a small bracket 14, a housing 15, a PCBA (Printed Circuit Board Assembly) 16, and a top cover 17.
[0029] The probe core 11 and the outer rubber ring 12 are fixed together by the frictional force generated when the rubber ring interferes with each other, clamping the outer side of the probe core 11. This interference ensures that moisture cannot enter the contact surface between the probe core 11 and the outer rubber ring 12. Optionally, the inner wall of the outer rubber ring 12 and the outer wall of the probe core 11 may partially interfere with each other, and this interference is a line contact, which facilitates installation. The interference between the two is relatively large, reaching 0.25mm on one side, with a compression ratio of 0.25 / 1.4 = 18%. Figure 3 As shown, the inner walls 121, 122, and 123 of the outer rubber ring 12 partially interfere with the outer wall of the probe core 11.
[0030] The probe core 11 and the inner rubber ring 13 are fixed by the frictional force generated when the outer side of the probe core is clamped during the interference of the rubber ring. This interference ensures that moisture cannot enter the contact surface between the probe core 11 and the inner rubber ring 13. Optionally, the inner wall of the inner rubber ring 13 and the outer wall of the probe core 11 partially interfere, with a relatively large interference between the inner rubber ring sidewall 13 and the probe core 11, reaching 0.25 mm on one side, with a compression ratio of 0.25 / 1.25 = 20%. The outer wall of the inner rubber ring and the inner wall of the shell are in line contact. Figure 4 As shown, the outer walls 131, 132, and 133 of the inner rubber ring 13 are in line contact with the inner side of the housing 15.
[0031] The small bracket 14 and the housing 15 are fixed by a snap-fit mechanical fastening. The annular structure at the top of the inner rubber ring 13 is located in the gap between the small bracket 14 and the housing 15, and the annular structure at the top of the inner rubber ring 13 partially interferes with the small bracket 14, and also partially interferes with the housing 15. This interference ensures that moisture cannot enter the contact surfaces between the small bracket 14 and the inner rubber ring 13, or between the inner rubber ring 13 and the housing 15. Optionally, the annular structure at the top of the inner rubber ring 13 interferes with the small bracket 14 through surface contact. Figure 5 As shown, the top surface 137 of the annular structure at the top of the inner rubber ring partially interferes with the small bracket 14, and the interference is relatively large, reaching 0.1 mm on one side. The bottom surface 138 of the annular structure at the top of the inner rubber ring 13 partially interferes with the shell 15, and the interference is relatively large, reaching 0.1 mm on one side. The compression ratio of the inner rubber ring is 0.2 / 1.0 = 20%.
[0032] The bottom surface of the inner rubber ring 13 interferes with a portion of the housing 15 along the probe's axial direction. Under the pressure of the small support 14 engaging with the housing 15, the bottom surface of the inner rubber ring 13 and the housing 15 are fixed axially by clamping the probe during this interference. Optionally, the bottom surface of the inner rubber ring 13 can be an annular structure, which interferes with a portion of the entire surface of the housing 15 to form a water-retaining wall. Figure 4As shown, the bottom surfaces 134, 135, and 136 of the inner rubber ring 13 interfere with the shell 15 in the height direction, with an interference amount of 0.20 mm and a compression ratio of 0.20 / 1.00 = 20%.
[0033] The above-described waterproof design achieves complete waterproofing of the ultrasonic sensor's front end. Optionally, the top cover 17 and the housing 15 are assembled by laser welding to achieve waterproofing through this structural process. A schematic diagram of the assembly of the top cover and housing can be found here. Figure 6 The top cover 17 can be a frame structure with an internal grid-like structure, such as... Figure 7 As shown. This ensures the product's rigidity, allowing the top cover 17 to protect the internal components from external damage. A structural diagram of the assembled ultrasonic sensor can be found in [reference needed]. Figure 8 .
[0034] In this embodiment of the ultrasonic sensor, the probe core is clamped to the outer and inner rubber rings via interference, generating friction to fix it in place. The interference of the rubber rings has a high compression ratio, ensuring that moisture cannot enter the contact surfaces between the probe core and the outer and inner rubber rings. The annular structure at the top of the inner rubber ring is inserted into the gap between the small support and the housing, and the interference of the rubber rings further prevents moisture from entering the contact surfaces between the small support and the inner rubber ring, and between the inner rubber ring and the housing. The bottom surface of the inner rubber ring partially interferes with the housing along the probe core's axial direction, further preventing moisture from entering the contact surface between the inner rubber ring and the housing. This achieves complete waterproofing, preventing moisture and water vapor from entering between the housing and the rubber rings. This results in high production efficiency and suitability for mass production. By increasing the compression ratio, the effects of tolerances and temperature can be ignored.
[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0036] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An ultrasonic sensor, characterized by, include: The probe core, outer rubber ring, inner rubber ring, small bracket, housing, printed circuit board assembly PCBA and top cover; The probe core is fixed by the frictional force generated when it is clamped to the outside of the probe core due to interference between the probe core and the outer rubber ring; the probe core is fixed by the frictional force generated when it is clamped to the outside of the probe core due to interference between the probe core and the inner rubber ring. The small bracket is fixed to the housing by a snap-fit mechanical fastening. The top annular structure of the inner rubber ring is located in the gap between the small bracket and the housing, and the top annular structure of the inner rubber ring partially interferes with the small bracket and partially interferes with the housing. The bottom surface of the inner rubber ring interferes with a portion of the housing along the probe axis. Under the pressure of the small bracket fastening the housing, the bottom surface of the inner rubber ring and the portion of the housing are fixed by clamping the probe axis during interference.
2. The ultrasonic sensor of claim 1, wherein, The bottom surface of the inner rubber ring has an annular structure, and the annular structure interferes with a portion of the shell surface to form a water-blocking wall.
3. The ultrasonic sensor of claim 1, wherein, The inner wall of the outer rubber ring and the outer wall of the probe core partially interfere with each other and are in line contact.
4. The ultrasonic sensor of claim 1, wherein, The inner wall of the inner rubber ring partially interferes with the outer wall of the probe core, and the outer wall of the inner rubber ring is in line contact with the inner wall of the housing.
5. The ultrasonic sensor according to claim 1, characterized in that, The annular structure at the top of the inner rubber ring interferes with the small bracket through partial surface contact.
6. The ultrasonic sensor of claim 1, wherein, The top cover and the housing are assembled by laser welding.