Mounting unit and sensor unit

Abstract

To provide a mounting unit that can ensure detection performance, and provide a sensor unit.SOLUTION: A mounting unit 30 comprises: a resin plate 10 to which a sonar sensor 50 is attached and which is fixed to a metal component A; and a rubber cushion 20 provided on the resin plate 10. The resin plate 10 has a main body part 11 inserted into an opening Ah of the metal component A. The main body part 11 includes an inside surface 11s to which the sonar sensor 50 is attached, and an outside surface 11r including an opposite area 17 where the main body part 11 is opposite to the metal component A. The rubber cushion 20 is provided on the outside surface 11r to be interposed between the opposite area 17 and the metal component A.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a mounting unit and a sensor unit.

Background Art

[0002] Patent Document 1 describes a structure in which an ultrasonic sensor is mounted on a vehicle. In this structure, an ultrasonic sensor is mounted on a front bumper formed of a metal plate material. The front bumper is provided with a mounting hole for attaching the ultrasonic sensor. A bezel is inserted into the mounting hole, and in that state, a retainer is sandwiched between the bezel and the front bumper. The ultrasonic sensor is attached to the front bumper via the bezel and the retainer. The retainer has an elastic portion which is a cantilever beam-shaped leaf spring portion extending from the retainer body, and the elastic portion abuts against the back surface of the front bumper.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, a sonar sensor can measure the distance to an obstacle by vibrating its microphone surface to generate ultrasonic waves and receiving the ultrasonic waves that bounce back after hitting the obstacle. By mounting a plurality of sonar sensors, the position of the obstacle can be specified. The irradiation range of the ultrasonic waves of the sonar sensor is determined, and in order to ensure the detection performance as designed, it is necessary to hold the sonar sensor at an optimal mounting position. However, since it is difficult to hold a sonar sensor alone, it is conceivable to attach a dedicated sensor holding component (retainer) to a mounted component such as a bumper and hold the sonar sensor via that component.

[0005] On the other hand, mounting sonar sensors on metal parts may lead to false detections and compromise performance. This is partly because vibrations from the side of the sonar sensor's microphone are transmitted to metal parts that do not easily attenuate vibrations, causing them to reverberate and be received by sensors adjacent to the ultrasonic sensor. In particular, the vibration transmission speed of metal parts is about 15 times faster than that of air, so vibrations from metal parts are detected before obstacles are detected by air vibrations, resulting in a significant increase in false detections.

[0006] In the structure described in Patent Document 1, the elastic portion extending from the retainer body is in contact with the front bumper, which is made of a metal plate. Therefore, there is a risk that vibrations may be transmitted to the metal front bumper via the retainer. Thus, there is room for consideration in order to suppress false detections and ensure detection performance.

[0007] Therefore, the purpose of this disclosure is to provide a mounting unit and a sensor unit capable of ensuring detection performance. [Means for solving the problem]

[0008] The mounting unit according to this disclosure is a mounting unit for mounting a sonar sensor on a plate-shaped metal part of a vehicle, comprising a resin plate to which the sonar sensor is attached and which is fixed to the metal part, and a rubber cushion provided on the resin plate, wherein the metal part has a first opening formed therein, the resin plate has a main body portion that is inserted into the first opening of the metal part, and a fixing portion for fixing the main body portion to the metal part, the main body portion includes a first surface to which the sonar sensor is attached, a second surface on the opposite side of the first surface which includes a facing region that faces the metal part when the main body portion is inserted into the first opening of the metal part, and a second opening that exposes the microphone surface of the sonar sensor attached to the first surface to the second surface, and the rubber cushion is provided on the second surface so as to be interposed between the facing region and the metal part when it is inserted.

[0009] This mounting unit includes a resin plate fixed to a metal component. The sonar sensor is mounted on the first surface of the main body of the resin plate, and the microphone surface of the sonar sensor is exposed to the second surface opposite the first surface through a second opening in the main body. Therefore, when the sonar sensor is mounted on the resin plate and the main body of the resin plate is inserted into the first opening of the metal component, the microphone surface of the sonar sensor is exposed to the outside of the metal component through the first and second openings. This enables the transmission of ultrasonic waves to the outside of the metal component and the reception of ultrasonic waves from the outside of the metal component. In particular, in this mounting unit, when the main body of the resin plate is inserted into the first opening of the metal component, a rubber cushion is interposed between the opposing region of the second surface of the resin plate and the metal component. In other words, with this mounting unit, at least a resin plate with excellent vibration damping properties and a rubber cushion are interposed between the sonar sensor and the metal component. Therefore, false detections due to vibrations from the sonar sensor being transmitted to the metal component are suppressed, and detection performance is ensured. In other words, this mounting unit makes it possible to suitably mount sonar sensors on metal parts where it was previously difficult to mount them.

[0010] In this case, if water is retained between the sonar sensor and the metal part, the vibration transmission speed increases, raising the risk of false detection. Therefore, in order to suppress false detection and ensure detection performance, it is desirable to create an environment where moisture is less likely to penetrate between the sonar sensor and the metal part.

[0011] Therefore, in the mounting unit according to this disclosure, the opposing region has an annular shape, and the rubber cushion is formed in a frame shape and provided around the entire circumference of the opposing region, filling the space between the opposing region and the metal component when inserted. In this case, the intrusion of moisture between the resin plate and the metal component is suppressed. Thus, false detections are further suppressed and detection performance is reliably ensured.

[0012] In the mounting unit according to this disclosure, the opposing region includes a first region that faces the inner surface of the first opening in the inserted state, and a second region that extends from the first region in a direction intersecting the first region and faces the plate surface of the metal part on the outside of the first opening in the inserted state. The rubber cushion may also include a cylindrical portion that is inserted into the first opening together with the main body in the inserted state and interposed between the first region and the inner surface, and a flange portion that is provided on the cylindrical portion so as to protrude to the outside of the cylindrical portion and interposed between the second region and the plate surface in the inserted state. In this case, the rubber cushion described above can be reliably constructed.

[0013] In the mounting unit according to this disclosure, the flange portion may include a protrusion that extends outward from the second region. In this case, the flange portion of the rubber cushion protrudes from the opposing region of the second surface of the resin plate. Therefore, water retention between the opposing region of the resin plate and the metal component is reliably suppressed.

[0014] The sensor unit according to this disclosure comprises one of the above-described mounting units, a retainer attached to the first surface, and a sonar sensor that is held by the retainer and attached to the first surface via the retainer, with its microphone surface exposed to the second surface through a second opening. This sensor unit comprises the above-described mounting unit. Therefore, false detections caused by vibrations from the sonar sensor being transmitted to the metal part are suppressed, and detection performance is ensured. Furthermore, it becomes possible to suitably mount the sonar sensor on the metal part.

[0015] The sensor unit according to this disclosure may include a cushioning ring attached to the side of the microphone so as to surround the side of the microphone connected to the microphone surface of the sonar sensor. In this case, the cushioning ring dampens vibrations emitted from the side of the microphone, thereby suppressing the propagation of such vibrations to other parts via the retainer. This ensures reliable detection performance and makes it possible to mount the sonar sensor more suitably on metal parts. [Effects of the Invention]

[0016] According to this disclosure, it is possible to provide an onboard unit and a sensor unit that can ensure detection performance. [Brief explanation of the drawing]

[0017] [Figure 1] Figure 1 is a perspective view showing how the mounting unit according to this embodiment is mounted on a metal component. [Figure 2] Figure 2 is an exploded perspective view of the sensor unit equipped with the mounting unit shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view of the sensor unit shown in Figure 2 mounted on a metal component. [Figure 4] Figure 4 is a perspective view showing the various parts of the mounting unit shown in Figure 1. [Modes for carrying out the invention]

[0018] An embodiment will be described below with reference to the drawings. In the following description of the drawings, the same or equivalent elements will be denoted by the same reference numeral, and redundant explanations may be omitted. In addition, each figure may show a Cartesian coordinate system defined by a first axis indicating the first direction D1, a second axis indicating the second direction D2, and a third axis indicating the third direction D3. For example, the first direction D1 and the second direction D2 are two intersecting horizontal directions, and the third direction D3 is a vertical direction intersecting the first direction D1 and the second direction D2.

[0019] Figure 1 is a perspective view showing the mounting unit according to this embodiment mounted on a metal component. Figure 2 is an exploded perspective view of the sensor unit equipped with the mounting unit shown in Figure 1. Figure 3 is a cross-sectional view of the sensor unit shown in Figure 2 mounted on a metal component. Figure 4 is a perspective view showing various parts of the mounting unit shown in Figure 1.

[0020] As shown in FIGS. 1 to 4, the sensor unit 1 includes a sonar sensor 50 that transmits and receives ultrasonic waves, and is mounted on a plate-shaped metal part A. The metal part A is, for example, a rear bumper of a vehicle such as a truck and is a sheet metal part. A plurality of openings (first openings) Ah penetrating the metal part A are formed in the metal part A (only one is shown). The plurality of openings Ah are arranged while being spaced apart from each other along the second direction D2.

[0021] The sensor unit 1 (that is, the sonar sensor 50) is attached to each of the plurality of openings Ah in the metal part A. Therefore, a plurality of sensor units 1 arranged while being spaced apart from each other along the second direction D2 are mounted on the metal part A (only one is shown). As a result, in this vehicle, it is possible to detect an obstacle and measure the distance to the obstacle and the position of the obstacle. Here, one of the plurality of sensor units 1 will be described.

[0022] The sensor unit 1 includes a mounting unit 30, a retainer 40, a sonar sensor 50, and a cushion ring 54. The sonar sensor 50 includes a columnar sensor body 51 and a housing 52 provided at the base end portion of the sensor body 51. The sensor body 51 is provided with a microphone surface 53 that emits ultrasonic waves at the tip end portion opposite to the housing 52. Further, the sensor body 51 has a microphone side surface (not shown) connected to the microphone surface 53 around the microphone surface 53. The cushion ring 54 is attached to the microphone side surface so as to surround the microphone side surface.

[0023] The mounting unit 30 includes a resin plate 10 and a rubber cushion 20. The resin plate 10 includes a main body portion 11 and a fixing portion 12. The main body portion 11 includes a flat bottom wall portion 13, a rectangular frame-shaped inner side wall portion 14 erected on the outer edge of the bottom wall portion 13, an outer side wall portion 15 provided outside the inner side wall portion 14 and having a rectangular frame shape larger than the inner side wall portion 14, and a connecting portion 16 connecting the inner side wall portion 14 and the outer side wall portion 15.

[0024] As a result, steps are formed in the main body 11 between the bottom wall 13 and the inner wall 14, and between the inner wall 14 and the outer wall 15, so that the bottom wall 13 protrudes the furthest outward (recesses inward). The bottom wall 13 has a circular opening (second opening) 13h that penetrates it. A pair of fixing parts 12 are provided so as to protrude outward from the outer wall 15 in the portion of the outer wall 15 that faces the opening 13h in the second direction D2. One of the pair of fixing parts 12 has a circular through hole 12h (reference hole), and the other of the pair of fixing parts 12 has an elongated through hole 12i (sub-reference hole). The circular through hole 12h is formed in a circular shape when viewed from the first direction D1, and the elongated through hole 12i is formed so as to be relatively longer in the second direction D2 than in the third direction D3 when viewed from the first direction D1.

[0025] The main body 11 includes an inner surface (first surface) 11s and an outer surface (second surface) 11r opposite to the inner surface 11s. The inner surface 11s is the surface to which the sonar sensor 50 is attached (via the retainer 40). The inner surface 11s is composed of the bottom wall 13, the inner wall 14, the outer wall 15, and the inner surface of the connecting portion 16. The outer surface 11r is composed of the bottom wall 13, the inner wall 14, the outer wall 15, and the outer surface of the connecting portion 16. The opening 13h is used when the sonar sensor 50 is attached to the inner surface 11s, allowing the sensor body 51 of the sonar sensor 50 to be inserted and exposing the microphone surface 53 of the sonar sensor 50 to the outer surface 11r.

[0026] On the inner surface 11s, in the portion corresponding to the inner surface of the bottom wall portion 13, a group of reference lines LG is provided on both sides in the third direction D3 of the opening 13h. The group of reference lines LG provides a guideline for the mounting position (orientation) when attaching the sonar sensor 50 to the inner surface 11s.

[0027] Each of the reference line groups LG includes a reference line L1 that extends linearly along the second direction D2, and a pair of reference lines L2 that intersect reference line L1 at its center and extend linearly. Each of the pair of reference lines L2 is inclined with respect to reference line L1 as if it were rotated by a predetermined angle in both the forward and reverse directions with respect to the center of reference line L1 as the center of rotation. Within each pair of reference line groups LG, the reference lines L1 and the reference lines L2 that are inclined in the same direction are approximately parallel to each other.

[0028] Therefore, when attaching the sonar sensor 50 to the inner surface 11s via the retainer 40, the mounting position (orientation) of the sonar sensor 50 can be defined by aligning the outer edge of the retainer 40 in the third direction D3 with a pair of substantially parallel reference lines L1. Furthermore, when attaching the sonar sensor 50 to the inner surface 11s via the retainer 40, a certain level of mounting accuracy can be ensured by ensuring that the outer edge of the retainer 40 in the third direction D3 falls within the range between the pair of reference lines L2.

[0029] The resin plate 10 described above is fixed to the metal part A by fixing the fixing part 12 to fixing part A1 provided on the plate surface As of the metal part A. More specifically, the metal part A is provided with a pair of hat-shaped bracket fixing parts A1 (for example, by welding), and the fixing part 12 and fixing part A1 are superimposed such that the round through hole 12h of the fixing part 12 coincides with the hole A1h of one of the fixing parts A1.

[0030] In this state, the fastening member (e.g., tapping screw) A3, which is inserted through the round through hole 12h and the elongated through hole 12i, is fastened (e.g., screwed) to the fastened member (e.g., grommet) A2, which is inserted through the holes A1h of the pair of fixing parts A1, thereby fixing the fixing part 12 to the fixing part A1, and fixing the main body part 11 and the resin plate 10 to the metal part A. At this time, a part of the resin plate 10 is inserted into the opening Ah of the metal part A. Here, the bottom wall part 13 of the main body part 11 is inserted into the opening Ah and positioned inside the opening Ah. Hereafter, the state in which the main body part 11 is inserted into the opening Ah in this manner will simply be referred to as the inserted state.

[0031] The outer surface 11r of the main body 11 includes a facing region 17 that faces the metal part A in the inserted state. The facing region 17 includes a first region 17a that faces the inner surface Ahs of the opening Ah of the metal part A in the inserted state, and a second region 17b that extends from the first region 17a in a direction intersecting the first region 17a and faces the plate surface As of the metal part A on the outside of the opening Ah in the inserted state. The first region 17a is a rectangular cylindrical region extending along the first direction D1, and the second region 17b is a rectangular annular region extending along the second direction D2 and the third direction D3.

[0032] The rubber cushion 20 is provided on the outer surface 11r of the main body portion 11 so as to be interposed between the opposing region 17 and the metal part A when inserted. The rubber cushion 20 is adhered to the outer surface 11r, for example, by double-sided tape. The rubber cushion 20 is formed in a rectangular frame shape and is provided around the entire circumference of the opposing region 17. More specifically, the rubber cushion 20 includes a rectangular cylindrical portion 21 and a rectangular annular flange portion 22. The rubber cushion 20 can be adhered to the outer surface 11r at the flange portion 22.

[0033] The cylindrical portion 21 is positioned to surround the bottom wall portion 13 when the rubber cushion 20 is provided on the outer surface 11r of the main body portion 11 (in other words, the bottom wall portion 13 is positioned inside the cylindrical portion 21). The flange portion 22 is provided on the cylindrical portion 21 so as to protrude from the end of the cylindrical portion 21 to the outside of the cylindrical portion 21. The rubber cushion 20 is formed in an L-shape in cross-section by the cylindrical portion 21 and the flange portion 22.

[0034] In the inserted state, the cylindrical portion 21 is inserted into the opening Ah of the metal part A together with the main body portion 11 (bottom wall portion 13) of the resin plate 10, and is interposed between the first region 17a of the opposing region 17 and the inner surface Ahs of the opening Ah. In the inserted state, the flange portion 22 is interposed between the second region 17b of the opposing region 17 and the plate surface As of the metal part A. In particular, the flange portion 22 includes a protruding portion 23 that extends around the entire circumference of the second region 17b and protrudes outward from the second region 17b. When the resin plate 10 is fixed to the metal part A, the rubber cushion 20 is pressed between the resin plate 10 and the metal part A and elastically deformed. As a result, the rubber cushion 20 contacts both the metal part A and the resin plate 10 (main body portion 11) and fills the space between them almost without any gaps.

[0035] The retainer 40 includes a cylindrical sensor holding portion 41, a flat plate-shaped mounting portion 42 provided at one end of the sensor holding portion 41 and extending outward from the sensor holding portion 41, and an engaging portion 43 provided at the other end of the sensor holding portion 41. The sensor body 51 of the sonar sensor 50 is inserted through the sensor holding portion 41. The engaging portion 43 engages with an engaging portion 55 provided on the housing 52 of the sonar sensor 50 when the sensor body 51 is inserted through the sensor holding portion 41.

[0036] As a result, the retainer 40 holds the sonar sensor 50. The retainer 40 is attached to the resin plate 10 by bonding (for example, by double-sided tape) its mounting portion 42 to the inner surface 11s of the main body portion 11 of the resin plate 10. In other words, the sonar sensor 50 is attached to the inner surface 11s of the resin plate 10 via the retainer 40 by being held by the retainer 40, and the microphone surface 53 is exposed to the outer surface 11r through the opening 13h of the resin plate 10.

[0037] For example, the retainer 40 is formed from a resin such as ABS. Also, for example, the resin plate 10 may be formed from PP material, which easily converts vibration energy into thermal energy. Furthermore, for example, the rubber cushion 20 may be formed from a material such as EPDM. The cushion ring 54 may be formed from a material such as silicone.

[0038] As described above, the mounting unit 30 according to this embodiment includes a resin plate 10 fixed to the metal part A. The sonar sensor 50 is attached to the inner surface 11s of the main body portion 11 of the resin plate 10, and the microphone surface 53 of the sonar sensor 50 is exposed to the outer surface 11r opposite to the inner surface 11s through the opening 13h of the main body portion 11. Therefore, when the sonar sensor 50 is attached to the resin plate 10 and the main body portion 11 of the resin plate 10 is inserted into the opening Ah of the metal part A, the microphone surface 53 of the sonar sensor 50 is exposed to the outside of the metal part A through the openings 13h and Ah. This makes it possible to transmit ultrasonic waves to the outside of the metal part A and to receive ultrasonic waves from the outside of the metal part A.

[0039] In particular, in the mounting unit 30, when the main body portion 11 of the resin plate 10 is inserted into the opening Ah of the metal part A, a rubber cushion 20 is interposed between the opposing region 17 of the outer surface 11r of the resin plate 10 and the metal part A. In other words, with the mounting unit 30, at least the resin plate 10, which has excellent vibration damping properties, and the rubber cushion 20 are interposed between the sonar sensor 50 and the metal part A. Therefore, false detections caused by vibrations from the sonar sensor 50 being transmitted to the metal part A are suppressed, and detection performance is ensured. In other words, with the mounting unit 30, it becomes possible to suitably mount the sonar sensor 50 on a metal part A, where it was previously difficult to mount the sonar sensor 50.

[0040] Furthermore, in the mounting unit 30, the opposing region 17 has an annular shape, and the rubber cushion 20 is formed in a frame shape and is provided around the entire circumference of the opposing region 17. The rubber cushion 20 fills the space between the opposing region 17 and the metal part A when inserted. This prevents moisture from entering between the resin plate 10 and the metal part A. As a result, false detections are further suppressed, and detection performance is reliably ensured.

[0041] Furthermore, in the mounting unit 30, the opposing region 17 includes a first region 17a that faces the inner surface Ahs of the opening Ah when inserted, and a second region 17b that extends from the first region 17a in a direction intersecting the first region 17a and faces the plate surface As of the metal part A on the outside of the opening Ah when inserted. The rubber cushion 20 includes a cylindrical portion 21 that is inserted into the opening Ah together with the main body 11 when inserted and interposed between the first region 17a and the inner surface Ahs, and a flange portion 22 that is provided on the cylindrical portion 21 so as to protrude to the outside of the cylindrical portion 21 and interposed between the second region 17b and the plate surface As when inserted. In this way, the rubber cushion 20 described above can be reliably constructed.

[0042] Furthermore, in the mounting unit 30, the flange portion 22 includes a protruding portion 23 that extends outward from the second region 17b. As a result, the flange portion 22 of the rubber cushion 20 protrudes from the opposing region 17 of the outer surface 11r of the resin plate 10. Therefore, water retention between the opposing region 17 of the resin plate 10 and the metal part A is reliably suppressed.

[0043] Furthermore, the sensor unit 1 according to this embodiment includes the mounting unit 30 described above, a retainer 40 attached to the inner surface 11s, and a sonar sensor 50 that is held by the retainer 40 and attached to the inner surface 11s via the retainer 40, with its microphone surface 53 exposed to the outer surface 11r through the opening 13h. The sensor unit 1 includes the mounting unit 30 described above. Therefore, false detections caused by vibrations from the sonar sensor 50 being transmitted to the metal part A are suppressed, and detection performance is ensured. In addition, it becomes possible to suitably mount the sonar sensor 50 on the metal part A.

[0044] Furthermore, the sensor unit 1 is equipped with a cushioning ring 54 attached to the side of the microphone so as to surround the side of the microphone connected to the microphone surface 53 of the sonar sensor 50. As a result, the cushioning ring 54 dampens vibrations emitted from the side of the microphone, thereby suppressing the propagation of such vibrations to other parts via the retainer 40. Thus, detection performance is reliably ensured, and the sonar sensor 50 can be mounted more suitably on metal parts.

[0045] The embodiments described above illustrate one form of the mounting unit and sensor unit according to the present disclosure. Therefore, the mounting unit and sensor unit according to the present disclosure may be any modification of those described above.

[0046] For example, the manner in which the metal part A and the resin plate 10 are fixed, and the manner in which the rubber cushion 20 and retainer 40 are attached to the resin plate 10, are not limited to those described above, but can be any manner. As an example, the rubber cushion 20 and retainer 40 may be fixed to the resin plate 10 by fitting.

[0047] Furthermore, in the above embodiment, the flange portion 22 of the rubber cushion 20 had a protruding portion 23 that projected outward from the area where the second region 17b of the opposing region 17 of the resin plate 10 and the metal part A faced each other. However, from the viewpoint of filling the space between the second region 17b of the opposing region 17 of the resin plate 10 and the metal part A, the protruding portion 23 is not essential. In this case, for example, the end of the flange portion 22 and the end of the second region 17b may be configured to be flush. Moreover, if the possibility of moisture intrusion is low, the end of the flange portion 22 may be recessed relative to the end of the second region 17b. [Explanation of symbols]

[0048] 1...Sensor unit, 10...Resin plate, 11...Main body, 11s...Inner surface (first surface), 11r...Outer surface (second surface), 12...Fixing part, 13h...Opening (second opening), 20...Rubber cushion, 21...Cylindrical part, 22...Flange part, 23...Protruding part, 30...Mounting unit, 40...Retainer, 50...Sonar sensor, 54...Cushion ring, A...Metal part, As...Plate surface, Ah...Opening (first opening), Ahs...Inner surface.

Claims

1. A mounting unit for attaching a sonar sensor to a plate-shaped metal part of a vehicle, A resin plate to which the sonar sensor is attached and which is fixed to the metal part, A rubber cushion provided on the aforementioned resin plate, Equipped with, The aforementioned metal part has a first opening formed therein. The aforementioned resin plate is The main body portion is inserted into the first opening of the metal part, A fixing part for fixing the main body to the metal part, It has, The main body is, The first surface on which the sonar sensor is attached, A second surface which is the surface opposite to the first surface and includes a facing region that faces the metal part when the main body is inserted into the first opening of the metal part, A second opening that exposes the microphone surface of the sonar sensor mounted on the first surface to the second surface, Includes, The rubber cushion is provided on the second surface so as to be interposed between the opposing region and the metal component in the inserted state. The opposing region has an annular shape, The rubber cushion is formed in a frame shape and is provided around the entire circumference of the opposing region, filling the space between the opposing region and the metal part in the inserted state. The opposing region is, In the insertion state, the first region facing the inner surface of the first opening, A second region extending from the first region in a direction intersecting the first region, and in the inserted state, facing the plate surface of the metal part outside the first opening, Includes, The aforementioned rubber cushion is In the aforementioned insertion state, a cylindrical portion is inserted into the first opening together with the main body and interposed between the first region and the inner surface, A flange portion is provided on the cylindrical portion so as to protrude to the outside of the cylindrical portion, and is interposed between the second region and the plate surface in the inserted state, Includes, The flange portion includes a projection that protrudes outward from the second region. The first surface is provided with a group of reference lines that provide a guideline for the mounting position when attaching the sonar sensor to the first surface. The installed unit.

2. The mounting unit according to Claim 1, A retainer attached to the first surface, The sonar sensor is held by the retainer and attached to the first surface via the retainer, with the microphone surface exposed to the second surface through the second opening, A sensor unit equipped with the following features.

3. The sonar sensor is equipped with a cushioning ring attached to the side of the microphone so as to surround the side of the microphone connected to the microphone surface of the sonar sensor. The sensor unit according to claim 2.

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