Vehicle-mounted ultrasonic sensor

Abstract

The application provides a vehicle-mounted ultrasonic sensor, comprising: a shell provided with a containing cavity; a probe core assembly with one end extending into the containing cavity; a front cover comprising a first connecting section and a second connecting section connected with each other, the first connecting section being sleeved on the shell, and the second connecting section being located at an opening of the containing cavity and extending to between the probe core assembly and the shell; and a sealing ring arranged in the containing cavity and surrounding the probe core assembly, an outer side wall of the sealing ring abutting against an inner wall of the shell, and an inner side wall of the sealing ring abutting against the probe core assembly; wherein one end of the sealing ring towards the opening is provided with a barrel and an annular groove arranged around the probe core assembly respectively, the annular groove being located at an inner side of the barrel and adjacent to the barrel, the sealing ring abutting against the second connecting section through the barrel, and a compression amount of the barrel being 0.05mm-0.2mm. The vehicle-mounted ultrasonic sensor provided by the application can reduce interference signals after assembly, reduce false alarms of vehicles, and ensure the judgment of parking distance.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and in particular to a vehicle-mounted ultrasonic sensor. Background Technology

[0002] Vehicle-mounted ultrasonic sensors are widely used in intelligent driving assistance systems and parking applications. They emit ultrasonic waves, receive the echoes reflected back after encountering obstacles, and then calculate the time difference between the round trip of the sound waves to accurately measure the distance to the obstacle.

[0003] Currently, vehicle-mounted ultrasonic sensors consist of a housing, a probe assembly, a sealing ring, and a front cover. The probe assembly is partially installed inside the housing, and the front cover is mounted on the housing and surrounds the probe assembly. The sealing ring seals the gaps between the probe assembly, the housing, and the front cover. However, after assembly, vehicle-mounted ultrasonic sensors are prone to interference signals, causing frequent false alarms and affecting the judgment of parking distances. Summary of the Invention

[0004] This application provides an in-vehicle ultrasonic sensor that, after assembly, can reduce interference signals, reduce false alarms from vehicles, and ensure accurate judgment of parking distance.

[0005] This application provides a vehicle-mounted ultrasonic sensor, including:

[0006] The outer casing has a receiving cavity;

[0007] The probe assembly has one end inserted into the receiving cavity;

[0008] The front cover includes a first connecting segment and a second connecting segment that are connected to each other. The first connecting segment is sleeved on the outer shell, and the second connecting segment is located at the opening of the receiving cavity and extends between the probe assembly and the outer shell.

[0009] A sealing ring is disposed within the receiving cavity and surrounds the probe assembly. The outer wall of the sealing ring abuts against the inner wall of the outer shell, and the inner wall of the sealing ring abuts against the probe assembly.

[0010] The sealing ring has a cylindrical body and an annular groove surrounding the probe assembly at the end facing the opening. The annular groove is located inside the cylindrical body and adjacent to it. The sealing ring abuts against the second connecting section through the cylindrical body. The compression of the cylindrical body is 0.05mm-0.2mm.

[0011] In one embodiment, the outer wall of the sealing ring has a first rib protruding from it, and the sealing ring abuts against the outer shell through the first rib; and / or,

[0012] The inner wall of the sealing ring is provided with a second rib, and the sealing ring is abutted by the second rib probe assembly.

[0013] In one embodiment, the inner wall of the outer casing includes a first clearance surface located on the outer side of the cylinder, with a gap between the first clearance surface and the cylinder.

[0014] In one embodiment, a support platform is provided inside the housing, and the probe assembly is located on the side of the support platform facing the opening;

[0015] The sealing ring includes an extension that is clamped between the end of the probe assembly that extends into the receiving cavity and the support platform.

[0016] In one embodiment, an annular groove is provided on the side of the extension facing the support platform, and the annular groove is positioned opposite to the support platform.

[0017] In one embodiment, a through hole is provided on the support platform, the extension section is annular, and an annular positioning protrusion is provided on the inner edge of the extension section. The positioning protrusion extends into the through hole, and the side of the positioning protrusion away from the probe assembly forms a second clearance surface. The second clearance surface gradually moves away from the axis of the through hole along the assembly direction of the probe assembly, and the lead wire of the probe assembly passes through the positioning protrusion.

[0018] In one embodiment, the first connecting segment is a conical cylindrical structure, the small-diameter end of the first connecting segment is connected to the second connecting segment, a limiting protrusion is provided at the end of the first connecting segment away from the second connecting segment, and an annular groove surrounding the receiving cavity is provided on the outer side of the outer shell, with the limiting protrusion extending into the annular groove.

[0019] In one embodiment, there are multiple limiting protrusions, each of which is arc-shaped and arranged in a ring-shaped interval around the axis of the front cover.

[0020] In one embodiment, the outer side wall of the housing is provided with a first guide surface. Along the axial direction of the probe assembly, the first guide surface is located between the opening and the annular groove. Along the assembly direction of the front cover, the first guide surface gradually moves away from the receiving cavity; and / or,

[0021] A first abutting surface is provided on the side of the annular groove near the opening of the receiving cavity, and a second abutting surface is provided on the side of the limiting protrusion near the second connecting section. The second abutting surface is parallel to the first abutting surface and abuts against the first abutting surface.

[0022] In one embodiment, a second guide surface is provided at the end of the second connecting segment away from the first connecting segment, and the second guide surface gradually moves away from the probe assembly along the assembly direction of the front cover.

[0023] The annular groove has a first sidewall opposite to the second guide surface, and the first sidewall gradually moves away from the probe assembly along the assembly direction of the front cover.

[0024] The vehicle-mounted ultrasonic sensor provided in this application embodiment has a probe assembly whose one end extends into the receiving cavity of the outer shell, and the gap between the probe assembly and the outer shell is sealed by a sealing ring. A front cover fitted onto the outer shell prevents the sealing ring from detaching from the probe assembly and the outer shell. The sealing ring abuts against the second connecting section of the front cover via a cylindrical body to seal the gap between the front cover and the probe assembly. The compression of the cylindrical body is 0.05mm-0.2mm, and the annular groove on the inner side of the cylindrical body where the sealing ring is located can accommodate the volume of the compressed and deformed cylindrical body. This design ensures effective compression of the cylindrical body while preventing excessive compression. While ensuring the waterproof performance of the vehicle-mounted ultrasonic sensor, it also prevents strong vibration transmission between the probe assembly and the front cover, reducing interference signals generated by the front cover and outer shell transmitting vibrations back to the probe assembly. Thus, after assembly, the vehicle-mounted ultrasonic sensor can reduce interference signals, reduce false alarms, and ensure accurate parking distance judgment. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of this application, the drawings used in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the vehicle-mounted ultrasonic sensor provided in the embodiments of this application;

[0027] Figure 2 An exploded view of the vehicle-mounted ultrasonic sensor provided in the embodiments of this application;

[0028] Figure 3 A cross-sectional view of a vehicle-mounted ultrasonic sensor provided in an embodiment of this application;

[0029] Figure 4 for Figure 3 A magnified view of the area where the sealing ring is located;

[0030] Figure 5 for Figure 4 A magnified view of a portion of the cylinder;

[0031] Figure 6 A schematic diagram of the outer casing provided in the embodiments of this application;

[0032] Figure 7 A cross-sectional view of the housing at the location of the receiving cavity provided in an embodiment of this application;

[0033] Figure 8 This is a schematic diagram of the structure of the front cover provided in an embodiment of this application;

[0034] Figure 9 A top view of the probe assembly provided in an embodiment of this application;

[0035] Figure 10 A cross-sectional view of the probe assembly provided in an embodiment of this application;

[0036] Figure 11 A schematic diagram showing the lead wire of the probe assembly provided in this application passing through the sealing ring;

[0037] Figure 12 A partial cross-sectional view of the front cover provided in an embodiment of this application;

[0038] Figure 13 This is a schematic diagram showing the connection between the probe assembly and the sealing ring provided in an embodiment of this application;

[0039] Figure 14 This is a schematic diagram of the received waveform of an on-board ultrasonic sensor in related technologies;

[0040] Figure 15 This is a schematic diagram of the received waveform of the vehicle-mounted ultrasonic sensor provided in an embodiment of this application.

[0041] Figure label:

[0042] 100. Outer shell; 110. Receiving cavity; 120. First clearance surface; 130. Support platform; 131. Support surface; 140. Annular groove; 150. First guide surface; 160. First abutment surface;

[0043] 200. Core probe assembly; 210. Lead wire; 220. Housing; 221. Upper contour; 222. Cavity; 223. Stepped section;

[0044] 300, front cover; 310, first connecting section; 311, limiting protrusion; 312, second abutting surface; 320, second connecting section; 321, second guide surface; 322, extrusion surface;

[0045] 400, sealing ring; 410, cylinder; 420, annular groove; 421, first side wall; 430, first rib; 440, second rib; 450, extension section; 451, annular groove; 460, positioning protrusion; 461, second clearance surface;

[0046] 500, Circuit Board;

[0047] 600, solder pad; 610, solder joint. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0049] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0050] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0052] Currently, vehicle-mounted ultrasonic sensors consist of a housing, a probe assembly, a sealing ring, and a front cover. The probe assembly is partially installed within the housing, while the front cover is mounted on the housing and surrounds the probe assembly. The sealing ring seals the gaps between the probe assembly, the housing, and the front cover. The probe assembly deforms under the inverse piezoelectric effect, exciting the piezoelectric material to vibrate and generate a detection signal. This signal is converted from an electrical signal to a mechanical signal and then to an acoustic signal, which is emitted to detect objects within its effective range. The feedback signal is converted from an acoustic signal to a mechanical signal and then back to an electrical signal, ultimately being recognized and analyzed by the detection instrument. The vibration of the piezoelectric material in the probe assembly drives the sealing ring, and the vibration is transmitted through the sealing ring and the front cover to the entire ultrasonic sensor. This residual vibration can also return to the probe assembly, causing signal interference. Vehicle-mounted ultrasonic sensors are prone to interference signals after assembly, leading to frequent false alarms and affecting the judgment of parking distances.

[0053] To address the aforementioned issues, this application provides a vehicle-mounted ultrasonic sensor. One end of its probe assembly extends into the receiving cavity of the outer casing, and a sealing ring seals the gap between the probe assembly and the outer casing. A front cover fitted onto the outer casing prevents the sealing ring from detaching from the probe assembly and the outer casing. The sealing ring abuts against the second connecting section of the front cover via a cylindrical body, sealing the gap between the front cover and the probe assembly. The compression of the cylindrical body is 0.05mm-0.2mm, and the annular groove inside the cylindrical body where the sealing ring is located can accommodate the volume of the compressed and deformed cylindrical body. This design ensures effective compression of the cylindrical body while preventing excessive compression. While maintaining the waterproof performance of the vehicle-mounted ultrasonic sensor, it also prevents strong vibration transmission between the probe assembly and the front cover, reducing interference signals generated by the front cover and outer casing transmitting vibrations back to the probe assembly. Thus, after assembly, the vehicle-mounted ultrasonic sensor reduces interference signals, decreases false alarms, and ensures accurate parking distance judgment.

[0054] The specific structure of the vehicle-mounted ultrasonic sensor provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0055] Reference Figures 1 to 10 As shown in the figure, this application provides a vehicle-mounted ultrasonic sensor, including a housing 100, a probe assembly 200, a front cover 300, and a sealing ring 400.

[0056] The housing 100 is provided with a receiving cavity 110, wherein the opening of the receiving cavity 110 is located at one end of the housing 100.

[0057] One end of the probe assembly 200 extends into the receiving cavity 110. Schematic, the probe assembly 200 includes a housing 220, a piezoelectric material, and a composite material. The housing 220 has an upper contour 221, a cavity 222, and a stepped portion 223. The piezoelectric material and the composite material are disposed inside the cavity 222. One end of the housing 220 extends into the receiving cavity 110. A lead 210 (such as an FPC) of the probe assembly 200 can extend out of the housing 220 from the end that extends into the receiving cavity 110. This lead 210 is electrically connected to the piezoelectric material.

[0058] The front cover 300 includes a first connecting segment 310 and a second connecting segment 320 that are interconnected. The first connecting segment 310 is fitted onto the outer shell 100, and the second connecting segment 320 is located at the opening of the receiving cavity 110 and extends between the probe assembly 200 and the outer shell 100. The first connecting segment 310 can be a cylindrical structure, and the second connecting segment 320 can be an annular sheet structure. The outer edge of the second connecting segment 320 is connected to one end of the first connecting segment 310. The first connecting segment 310 and the second connecting segment 320 form a single piece. When the first connecting segment 310 is fitted onto the outer shell 100, the second connecting segment 320 blocks part of the opening.

[0059] A sealing ring 400 is disposed within the receiving cavity 110 and surrounds the probe assembly 200. The outer wall of the sealing ring 400 abuts against the inner wall of the outer shell 100, and the inner wall of the sealing ring 400 abuts against the probe assembly 200. When the sealing ring 400 is positioned between the outer shell 100 and the probe assembly 200, the outer shell 100 and the probe assembly 200 together compress the sealing ring 400, achieving a seal between them through the elastic deformation of the sealing ring 400.

[0060] Optionally, the sealing ring 400 can be made of semi-transparent full-phase silicone material, which has a vibration damping effect. During the assembly of the vehicle-mounted ultrasonic sensor, the sealing ring 400 can be assembled with the probe assembly 200 first, and then one end of the probe assembly 200 can be used to push the sealing ring 400 into the receiving cavity 110 of the housing 100.

[0061] The sealing ring 400 is provided with a cylindrical body 410 and an annular groove 420 surrounding the probe assembly 200 at one end facing the opening of the receiving cavity 110. The annular groove 420 is located inside the cylindrical body 410 and adjacent to the cylindrical body 410. The sealing ring 400 abuts against the second connecting section 320 through the cylindrical body 410. The compression of the cylindrical body 410 is 0.05mm-0.2mm.

[0062] like Figures 3-5As shown, the cylinder 410 and the annular groove 420 are located at the ends of the sealing ring 400 away from the interior of the receiving cavity 110. Schematic, the cylinder 410 and the annular groove 420 can be integrally formed on the sealing ring 400, and the cylinder 410 and the annular groove 420 are respectively arranged around the axis of the sealing ring 400. Figure 4 and Figure 5 As shown, the annular groove 420 is located on the side of the cylinder 410 facing the probe assembly 200. When the cylinder 410 is subjected to an external force, it can undergo elastic deformation. At this time, part of the cylinder 410 can extend into the annular groove 420, that is, the annular groove 420 can be used to accumulate the volume of the cylinder 410 after compression deformation.

[0063] Figure 5 and Figure 8 As shown, the second connecting section 320 has a compression surface 322 facing the interior of the receiving cavity 110. After the vehicle-mounted ultrasonic sensor is assembled, the compression surface 322 compresses the end of the cylinder 410, causing the cylinder 410 to undergo elastic deformation. The design of the cylinder 410 reduces the contact area between the sealing ring 400 and the front cover 300. By accommodating part of the cylinder 410 through the annular groove 420, contact between the cylinder 410 and the outer shell 100 is avoided after compression deformation, which helps to reduce the transmission of vibration between the probe assembly 200 and the outer shell 100.

[0064] For example, the compression amount H of the cylinder 410 can be 0.05mm, 0.1mm, 0.15mm, or 0.2mm, etc., and is not limited to a single value. When the compression amount H of the cylinder 410 is less than 0.05mm, the compression amount of the cylinder 410 is insufficient, resulting in a decrease in the waterproof performance of the vehicle-mounted ultrasonic sensor and affecting its service life. When the compression amount H of the cylinder 410 is greater than 0.2mm, the cylinder 410 is excessively compressed, causing strong vibration transmission between the outer shell 100 and the probe assembly 200, which causes interference signals to the vehicle-mounted ultrasonic sensor. The compression amount of the cylinder 410 can be controlled by controlling the dimensions and fit tolerances of the front cover 300, the outer shell 100, and the sealing ring 400. The above settings can prevent the sealing ring 400 from being excessively compressed during the assembly of the vehicle-mounted ultrasonic sensor, ensuring the normal use of the vehicle-mounted ultrasonic sensor.

[0065] The vehicle-mounted ultrasonic sensor provided in this embodiment suppresses the transmission of vibration between the probe assembly 200 and the front cover 300, weakens the return residual vibration, and achieves the effect of preventing interference.

[0066] In one embodiment, such as Figure 3 and Figure 4 As shown, the outer side wall of the sealing ring 400 is provided with a first rib 430, and the sealing ring 400 abuts against the outer shell 100 through the first rib 430.

[0067] The first rib 430 can be an annular protrusion, which is arranged around the axis of the sealing ring 400. There can be one or more first ribs 430. When there are multiple first ribs 430, they are arranged at intervals along the axial direction of the probe assembly 200. The sealing ring 400 abuts against the outer shell 100 through the first ribs 430, reducing the contact area between the sealing ring 400 and the outer shell 100, reducing vibration transmission between them, and making it less likely for the outer shell 100 to transmit vibration to the probe assembly 200 through the sealing ring 400, further reducing interference from the vehicle-mounted ultrasonic sensor.

[0068] Figure 3 and Figure 4 As shown, the inner sidewall of the sealing ring 400 is provided with a second rib 440, and the sealing ring 400 is abutted against by the probe assembly 200 of the second rib 440.

[0069] The second rib 440 can be an annular protrusion, arranged around the axis of the sealing ring 400. There can be one or more second ribs 440; when there are multiple second ribs 440, they are spaced apart along the axial direction of the probe assembly 200. The sealing ring 400 abuts against the probe assembly 200 through the second ribs 440, reducing the contact area between the sealing ring 400 and the probe assembly 200, thus reducing vibration transmission between them. The sealing ring 400 is less likely to transmit vibration to the probe assembly 200, further reducing interference from the vehicle-mounted ultrasonic sensor.

[0070] In one embodiment, such as Figures 3-5 and Figure 7 As shown, the inner wall of the outer shell 100 includes a first clearance surface 120, which is located on the outer side of the cylinder 410, and there is a gap between the first clearance surface 120 and the cylinder 410.

[0071] The first clearance surface 120 can be either an inclined surface or an arc surface, along... Figure 4 From bottom to top, the first clearance surface 120 gradually moves away from the cylinder 410. After the vehicle-mounted ultrasonic sensor is assembled, when the extrusion surface 322 of the second connecting section 320 extrudes the cylinder 410, the gap between the first clearance surface 120 and the cylinder 410 can accumulate part of the volume of the cylinder 410 after compression deformation.

[0072] With the above-mentioned design, the cylinder 410 is less likely to come into contact with the outer shell 100 after compression and deformation, which helps to reduce vibration transmission between the probe assembly 200 and the outer shell 100, thereby reducing interference. In addition, when the first clearance surface 120 is a slope or arc surface, it can also play a guiding role, making it easier for the staff to insert the probe assembly 200 and the sealing ring 400 into the receiving cavity 110.

[0073] In one embodiment, such as Figure 3 , Figure 4 and Figure 7 As shown, a support platform 130 is provided inside the outer casing 100, and the probe assembly 200 is located on the side of the support platform 130 facing the opening of the receiving cavity 110. The support platform 130 is a plate-shaped structure that can extend in a direction perpendicular to the axial direction of the probe assembly 200, and the support platform 130 can be integrally formed onto the outer casing 100.

[0074] The sealing ring 400 includes an extension 450, which is clamped between the end of the probe assembly 200 that extends into the receiving cavity 110 and the support platform 130.

[0075] Schematic, the extension 450 extends parallel to the extension direction of the support platform 130, and can be integrally formed onto the sealing ring 400. The side of the support platform 130 facing the opening of the receiving cavity 110 is the support surface 131, which supports the sealing ring 400 and the probe assembly 200. The extension 450 is sandwiched between the support surface 131 and the probe assembly 200.

[0076] This structure, by supporting the sealing ring 400 and the probe assembly 200 through the support platform 130, allows the cylinder 410 of the sealing ring 400 away from the support platform 130 to reliably abut against the second connecting section 320, and the extension section 450 of the sealing ring 400 is clamped between the support platform 130 and the probe assembly 200, further improving the waterproofness of the vehicle-mounted ultrasonic sensor.

[0077] In a specific embodiment, such as Figure 3 , Figure 4 and Figure 11 As shown, an annular groove 451 is provided on the side of the extension section 450 facing the support platform 130, and the annular groove 451 is opposite to the support platform 130.

[0078] Schematic, the annular groove 451 has a first projection along the axial direction of the probe assembly 200, and the support platform 130 has a second projection along the axial direction of the probe assembly 200, with the first projection located within the second projection. After assembly, the opening of the annular groove 451 faces the support platform 130. The annular groove 451 reduces the contact area between the extension section 450 and the support platform 130, thereby reducing vibration transmission between them and minimizing interference.

[0079] In other embodiments, a protrusion may be provided on the side of the extension 450 facing the support platform 130. The extension 450 abuts against the support platform 130 through the protrusion, which can reduce the contact area between the extension 450 and the support platform 130.

[0080] In a specific embodiment, such as Figure 3 , Figure 4 , Figure 7 , Figure 11 and Figure 13 As shown, the support platform 130 has a through hole, and the extension section 450 is annular. An annular positioning protrusion 460 is provided on the inner edge of the extension section 450, and the positioning protrusion 460 extends into the through hole. The side of the positioning protrusion 460 away from the probe assembly 200 forms a second clearance surface 461. The second clearance surface 461 gradually moves away from the axis of the through hole along the assembly direction of the probe assembly 200. The lead wire 210 of the probe assembly 200 passes through the positioning protrusion 460.

[0081] The assembly direction of the core probe component 200 is as follows: Figure 3 The direction from top to bottom. For example... Figure 3 As shown, the interior of the housing 100 also includes a circuit board 500 and solder pads 600. Both the circuit board 500 and solder pads 600 are located on the side of the support platform 130 opposite to the probe assembly 200. The solder pads 600 are electrically connected to the circuit board 500. The lead wire 210 of the probe assembly 200 passes through the positioning protrusion 460 and is electrically connected to the solder joint 610 on the solder pad 600. For example, the through hole can be coaxially arranged with the probe assembly 200. After the positioning protrusion 460 on the extension 450 extends into the through hole, the lead wire 210 of the probe assembly 200 can pass through the annular positioning protrusion 460. The positioning protrusion 460 can be integrally formed on the inner edge of the extension 450. The engagement between the positioning protrusion 460 and the through hole can position the sealing ring 400, facilitating the assembly of the sealing ring 400.

[0082] Optionally, the second clearance surface 461 can be a curved surface or a sloped surface, along... Figure 3 and Figure 4 From top to bottom, the diameter of the hole in the middle of the positioning protrusion 460 gradually increases, that is, the hole in the middle of the positioning protrusion 460 is formed into a trumpet hole, and the large diameter end of the trumpet hole is set away from the probe core assembly 200.

[0083] In related technologies, the lead wire 210 of the probe assembly 200 has limited space for movement at the through hole of the sealing ring 400, and the lead wire 210 contacts the pins or pads 600 outside the probe assembly 200, making it difficult to weld the lead wire 210. In this embodiment, by providing a second clearance surface 461 on the positioning protrusion 460, the range of motion for welding the lead wire 210 is increased, which facilitates the welding of the lead wire 210 and helps to avoid the risk of wire breakage due to contact friction.

[0084] In one embodiment, such as Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, the first connecting section 310 is a conical cylindrical structure. The small-diameter end of the first connecting section 310 is connected to the second connecting section 320. A limiting protrusion 311 is provided at the end of the first connecting section 310 away from the second connecting section 320. An annular groove 140 surrounding the receiving cavity 110 is provided on the outer side of the outer shell 100. The limiting protrusion 311 extends into the annular groove 140.

[0085] The distance between the first connecting segment 310 and the axis of the probe assembly 200 is along... Figure 3 and Figure 4 The diameter gradually increases from top to bottom. The inner diameter of the first connecting segment 310 is largest at the end furthest from the second connecting segment 320. When the first connecting segment 310 is fitted onto the outer shell 100 from top to bottom, the front cover 300 experiences less compression deformation because the limiting protrusion 311 is located at the large-diameter end of the first connecting segment 310.

[0086] In related technologies, the sidewall of the front cover 300 is a conical cylindrical structure. An annular limiting groove is provided in the center of the front cover 300 along its axial direction. An annular boss is provided on the outer shell 100. After the front cover 300 is fitted onto the outer shell 100, the annular boss extends into the annular limiting groove. In these related technologies, the front cover 300 requires a large amount of compressive deformation during the fitting process. The front cover 300 is not easily assembled into place during assembly, and it is difficult for it to snap into place with the outer shell 100. Furthermore, forcibly pressing the front cover 300 into place carries the risk of breakage.

[0087] In this embodiment, the first connecting section 310 is a conical cylindrical structure. A limiting protrusion 311 is provided at the large-diameter end of the first connecting section 310. The front cover 300 is limited to the outer shell 100 by the cooperation between the limiting protrusion 311 and the annular groove 140. The front cover 300 has less compression deformation during the assembly process, which facilitates the assembly of the front cover 300. The front cover 300 is easier to snap into place and slide into place, while preventing the front cover 300 from breaking.

[0088] In a specific embodiment, such as Figure 4 , Figure 11 and Figure 13 As shown, there are multiple limiting protrusions 311, each of which is arc-shaped and arranged in a ring around the axis of the front cover 300.

[0089] Those skilled in the art can set the specific number of limiting protrusions 311 as needed, such as three or four, etc., and there is no unique limitation here. For example, multiple limiting protrusions 311 can be arranged at equal intervals around the axis of the front cover 300.

[0090] The above-mentioned arrangement ensures the reliability of the connection between the front cover 300 and the outer shell 100. Compared with setting the limiting protrusion 311 as a complete ring, it can reduce the amount of compression deformation of the front cover 300 during the assembly process, further facilitate the assembly of the front cover 300, and further prevent the front cover 300 from cracking.

[0091] In a specific embodiment, such as Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the outer side wall of the outer casing 100 is provided with a first guide surface 150. Along the axial direction of the probe assembly 200, the first guide surface 150 is located between the opening of the receiving cavity 110 and the annular groove 140. Along the assembly direction of the front cover 300, the first guide surface 150 gradually moves away from the receiving cavity 110.

[0092] The assembly direction of the front cover 300 is... Figure 3 The direction from top to bottom. For example, the first guide surface 150 can be an inclined surface, along... Figure 3 In the direction from top to bottom, the first guide surface 150 gradually moves away from the axis of the probe assembly 200. There can be one or more first guide surfaces 150. When there are multiple first guide surfaces 150, the multiple first guide surfaces 150 are connected sequentially along the axis of the probe assembly 200.

[0093] In this embodiment, during the process of the front cover 300 being fitted onto the outer shell 100, when the limiting protrusion 311 abuts against the first guide surface 150, the limiting protrusion 311 can be driven away from the axis of the probe assembly 200 under the action of the first guide surface 150, which facilitates the assembly of the front cover 300.

[0094] In a specific embodiment, such as Figure 3 , Figure 4 and Figure 12As shown, the annular groove 140 is provided with a first abutting surface 160 on the side near the opening of the receiving cavity 110, and the limiting protrusion 311 is provided with a second abutting surface 312 on the side near the second connecting section 320. The second abutting surface 312 is parallel to the first abutting surface 160 and abuts against the first abutting surface 160.

[0095] For example, the cross-sectional shape of the limiting protrusion 311 can be trapezoidal, and the second abutment surface 312 is the trapezoidal side facing the second connecting section 320. The cross-sectional shape of the annular groove 140 matches the cross-sectional shape of the limiting protrusion 311, and the first abutment surface 160 is the side of the annular groove 140 facing the opening of the receiving cavity 110.

[0096] In related technologies, the cross-sectional shape of the annular boss on the outer shell 100 is elliptical, and the cross-sectional shape of the annular limiting groove on the front cover 300 matches the cross-sectional shape of the annular boss, with the annular boss and the front cover 300 in line contact. After assembly, the limiting effect of the front cover 300 on the outer shell 100 is relatively small. In this embodiment, after assembly, the reliable abutment between the first abutment surface 160 and the second abutment surface 312 changes the contact method between the front cover 300 and the outer shell 100 from line contact in related technologies to surface contact, ensuring the limiting effect of the annular groove 140 on the limiting protrusion 311 and ensuring that the front cover 300 can be reliably limited on the outer shell 100.

[0097] In one embodiment, such as Figure 4 , Figure 5 and Figure 12 As shown, the second connecting section 320 has a second guide surface 321 at the end away from the first connecting section 310. The second guide surface 321 gradually moves away from the probe assembly 200 along the assembly direction of the front cover 300. The annular groove 420 has a first sidewall 421 opposite to the second guide surface 321. The first sidewall 421 gradually moves away from the probe assembly 200 along the assembly direction of the front cover 300.

[0098] The second guide surface 321 is inclined to the axis of the probe assembly 200, along... Figures 3-5 From top to bottom, the distance between the second guide surface 321 and the axis of the probe assembly 200 gradually increases. During the assembly of the front cover 300, the second guide surface 321 can guide the probe assembly 200, facilitating its passage through the front cover 300. The first sidewall 421 can also be inclined relative to the axis of the probe assembly 200, along... Figures 3-5 From top to bottom, the distance between the first sidewall 421 and the axis of the probe assembly 200 gradually increases.

[0099] With the above settings, the end of the second connecting section 320 facing the probe assembly 200 can be prevented from contacting the sealing ring 400, reducing the vibration transmission between the front cover 300 and the sealing ring 400, thereby reducing the interference of the vibration transmitted back from the front cover 300 to the vehicle ultrasonic sensor.

[0100] The received waveforms of existing vehicle-mounted ultrasonic sensors and the received waveforms of the vehicle-mounted ultrasonic sensor provided in this embodiment are obtained respectively. For example... Figure 14 As shown, the received waveform of the existing vehicle-mounted ultrasonic sensor exhibits interference. For example... Figure 15 As shown, the received waveform of the vehicle-mounted ultrasonic sensor provided in this embodiment does not exhibit any interference waveforms.

[0101] Twenty existing vehicle-mounted ultrasonic sensors and the vehicle-mounted ultrasonic sensor provided in this embodiment were assembled separately. The required fastening force for the front cover 300, the breakage of the front cover 300, and the first-time fastening yield of the front cover 300 were recorded during the assembly process. The recorded results are shown in Table 1.

[0102] Table 1:

[0103]

[0104] As shown in Table 1, compared with existing vehicle ultrasonic sensors, the vehicle ultrasonic sensor provided in this embodiment requires less fastening force during the assembly process of the front cover 300, which improves the first-time fastening yield of the front cover 300, and the front cover 300 will not crack.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A vehicle-mounted ultrasonic sensor, characterized in that, include: The outer shell has a receiving cavity, and a support platform is provided inside the outer shell; The probe assembly has one end inserted into the receiving cavity; The front cover includes a first connecting segment and a second connecting segment that are connected to each other. The first connecting segment is sleeved on the outer shell, and the second connecting segment is located at the opening of the receiving cavity and extends between the probe assembly and the outer shell. A sealing ring is disposed within the receiving cavity and surrounds the probe assembly. The sealing ring includes an extension section. The outer sidewall of the sealing ring abuts against the inner wall of the outer shell, and the inner sidewall of the sealing ring abuts against the probe assembly. The sealing ring has a cylindrical body and an annular groove surrounding the probe assembly at one end facing the opening of the receiving cavity. The annular groove is located inside the cylindrical body and adjacent to it. The sealing ring abuts against the second connecting section through the cylindrical body. The compression of the cylindrical body is 0.05mm-0.2mm. The inner wall of the outer shell includes a first clearance surface, which is located on the outer side of the cylinder and is spaced apart from the cylinder. The support platform has a through hole, the extension section is annular, and the inner edge of the extension section is provided with an annular positioning protrusion. The positioning protrusion extends into the through hole, and the side of the positioning protrusion away from the probe assembly forms a second clearance surface. The second clearance surface gradually moves away from the axis of the through hole along the assembly direction of the probe assembly. The lead wire of the probe assembly passes through the positioning protrusion. The first connecting section is a conical cylindrical structure. The small-diameter end of the first connecting section is connected to the second connecting section. A limiting protrusion is provided at the end of the first connecting section away from the second connecting section. An annular groove surrounding the receiving cavity is provided on the outer side of the outer shell. The limiting protrusion extends into the annular groove. The outer wall of the outer casing is provided with a first guide surface. Along the axial direction of the probe assembly, the first guide surface is located between the opening of the receiving cavity and the annular groove. Along the assembly direction of the front cover, the first guide surface gradually moves away from the receiving cavity; and / or, The annular groove has a first abutting surface on the side near the opening of the receiving cavity, and the limiting protrusion has a second abutting surface on the side near the second connecting section. The second abutting surface is parallel to the first abutting surface and abuts against the first abutting surface.

2. The vehicle-mounted ultrasonic sensor according to claim 1, characterized in that, The outer wall of the sealing ring is provided with a first rib, and the sealing ring abuts against the outer shell through the first rib; and / or, The inner wall of the sealing ring is provided with a second rib, and the sealing ring abuts against the probe assembly through the second rib.

3. The vehicle-mounted ultrasonic sensor according to claim 1, characterized in that, The probe assembly is located on the side of the support platform facing the opening of the receiving cavity; The extension is clamped between the end of the probe assembly that extends into the receiving cavity and the support platform.

4. The vehicle-mounted ultrasonic sensor according to claim 3, characterized in that, The extension section has an annular groove on the side facing the support platform, and the annular groove is positioned opposite to the support platform.

5. The vehicle-mounted ultrasonic sensor according to claim 1, characterized in that, The number of the limiting protrusions is multiple, each of the limiting protrusions is arc-shaped, and the multiple limiting protrusions are arranged in a ring at intervals around the axis of the front cover.

6. The vehicle-mounted ultrasonic sensor according to any one of claims 1-4, characterized in that, The second connecting segment is provided with a second guide surface at the end away from the first connecting segment, and the second guide surface gradually moves away from the probe assembly along the assembly direction of the front cover; The annular groove has a first sidewall opposite to the second guide surface, and the first sidewall gradually moves away from the probe assembly along the assembly direction of the front cover.

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