JP2011053021A - Ultrasonic sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic sensor capable of preventing backlash of an ultrasonic sensor body with a simple structure, even when a housing of an ultrasonic microphone is cylindrical. <P>SOLUTION: The ultrasonic sensor includes: a bezel 2 including a tubular trunk 21 penetrating to an attachment hole 31 bored in a bumper 3 of a vehicle and a flange 22 having a front end peripheral edge of the trunk 21 widened in a flange shape; and the sensor body 1 in which a housing front 11 housing the ultrasonic microphone 4 is projected at a front surface of a housing rear 11 housing an electronic circuit board and the housing front 11 is fitted into the trunk 21. A protection nail 211 is provided at the trunk 21 of the bezel 2. A periphery of the attachment hole 31 is held between the protection nail 211 and the flange 22. The front edge of a side surface 12a of the housing front 12 is formed of an slope 12b. When the sensor body 1 is fitted into the bezel 2, a protrusion 12c abutting against an inner surface of the bezel 2 is provided at the slope 12b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an ultrasonic sensor attached to a bumper of a vehicle.

  2. Description of the Related Art Conventionally, a vehicle obstacle detection device that detects an obstacle is known from the viewpoint of supporting a driver's driving operation. This type of device supports an ultrasonic sensor on a vehicle bumper, transmits an ultrasonic wave from the ultrasonic sensor, and receives a reflected wave from the obstacle, thereby detecting an obstacle present in the detection area. This is to inform the driver. When the ultrasonic sensor is supported by the vehicle bumper, an attachment hole is formed in the bumper, and the ultrasonic sensor is supported so that the ultrasonic microphone housed in the ultrasonic sensor is exposed from the attachment hole.

  Conventionally, various methods are provided as a method of supporting an ultrasonic sensor on a bumper. Hereinafter, as a conventional example 1, an ultrasonic sensor using a retainer clip as a support unit of the ultrasonic sensor will be described (for example, Patent Document 1).

  The ultrasonic sensor of Conventional Example 1 includes a bezel, a sensor body, and a retainer clip. The bezel has a cylindrical body portion penetrating through a mounting hole formed in a bumper of the vehicle, and a front end periphery of the body portion is widened in a flange shape, and a rear surface abuts on a peripheral portion of the mounting hole on the bumper surface side. It consists of a flange part. The sensor body includes a housing rear portion that houses an electronic circuit board, and a housing front portion that protrudes in a cylindrical shape from the front surface of the housing rear portion and houses an ultrasonic microphone. The front part of the housing is inserted into the body part of the bezel from the back side of the bumper and is fitted to each other. The retainer clip is configured by a planar U-shaped plate member having a pair of insertion portions.

  With the above configuration, the retainer clip is inserted between a pair of insertion portions provided on the body portion of the bezel and the housing front portion of the sensor main body, and the bezel and the sensor main body are fixed to each other. The sonic sensor is supported by the bumper.

  Next, as a conventional example 2, an ultrasonic sensor using a spring as a support means of the ultrasonic sensor will be described (for example, Patent Document 2).

  The ultrasonic sensor of Conventional Example 2 includes a bezel and a sensor body. The bezel is configured by a flange portion whose rear surface abuts on a peripheral portion of the mounting hole on the bumper surface side, and a holding portion that protrudes from the flange portion to the bumper back surface side through the mounting hole and holds the sensor body. The sensor body is engaged between the rear portion of the housing that houses the electronic circuit board, the front portion of the housing that houses the ultrasonic microphone, and the holding portion of the bezel that protrudes in a cylindrical shape from the front surface of the rear portion of the housing. And a spring portion having a plurality of springs. The spring portion is composed of a plurality of springs that are elastically deformed between the sensor body and the back surface of the bumper, and the ultrasonic sensor is supported on the bumper by sandwiching the bumper between the spring portion and the flange portion. .

  Next, as Conventional Example 3, an ultrasonic sensor that supports a bumper by providing a holding claw on a bezel will be described (for example, Patent Document 3).

  The ultrasonic sensor of Conventional Example 3 includes a bezel and a sensor body. The bezel has a substantially rectangular cross section penetrating through a mounting hole drilled in a bumper of the vehicle, and a cylindrical body portion, and the front end periphery of the body portion is widened in a flange shape, and the periphery of the mounting hole on the bumper surface side And a flange portion with which the rear surface abuts. In addition, holding claws are provided apart in the circumferential direction of the body, and the holding claws can be bent in the front-rear direction and the plane crossing the front-rear direction, and when inserted into the mounting hole, the back side of the bumper The bumper is held between the flange portion by elastic contact with the peripheral portion of the mounting hole.

  The sensor body includes a housing rear portion that houses an electronic circuit board, and a housing front portion that protrudes in a substantially rectangular shape from the front surface of the housing rear portion and houses two ultrasonic microphones. The front part of the housing is fitted into the body part of the bezel on the back side of the bumper.

  In attaching the ultrasonic sensor to the bumper, the bezel is temporarily fixed to the bumper by inserting the bezel into the attachment hole of the bumper and holding the peripheral portion of the attachment hole with the flange portion and the plurality of holding claws. Thereafter, the sensor main body can be attached to the bezel by inserting the housing front portion of the sensor main body into the body portion of the bezel from the back side of the bumper. Further, by inserting the front portion of the housing into the body portion of the bezel, the holding claw is prohibited from bending to the inside of the body portion of the bezel, and the ultrasonic sensor is supported by the bumper.

JP 2008-26231 A JP 2006-47008 A Japanese Patent No. 3931819

  However, since the ultrasonic sensor of the conventional example 1 uses a retainer clip as a support means for the bumper, the number of parts constituting the ultrasonic sensor becomes three points, which increases the cost and is used when attaching the ultrasonic sensor to the bumper. Man-hours increase.

  The ultrasonic sensor of Conventional Example 2 has two parts. However, since the spring is used as a support means for the bumper, the structure becomes complicated and the cost increases.

  In the ultrasonic sensor of Conventional Example 3, since the body part of the bezel and the front part of the housing are formed in a substantially rectangular shape, the space between the bezel and the front part of the housing when the front part of the housing is fitted into the body part is inserted. The backlash was suppressed. However, when the body portion and the front portion of the housing are formed in a substantially cylindrical shape, there is a problem that rattling occurs between the bezel and the sensor body when the front portion of the housing is fitted into the body portion.

  The present invention has been made in view of the above-described reasons, and an object of the present invention is to provide ultrasonic waves that can prevent rattling of the ultrasonic sensor body with a simple configuration even when the ultrasonic microphone housing is cylindrical. It is to provide a sensor.

  According to the first aspect of the present invention, a cylindrical body portion penetrating an attachment hole formed in a bumper of a vehicle, and a front end peripheral edge of the body portion are widened in a flange shape, and a rear surface is provided on the periphery of the attachment hole on the bumper surface side. And a cylinder part containing an ultrasonic microphone projectingly provided on the front part of the housing containing the electronic circuit board, and the cylinder part is provided on the back side of the bumper. It is composed of a sensor body that is inserted into the body part, and a plurality of holding claws are provided in the body part of the mounting frame so as to be spaced apart in the circumferential direction. When the mounting frame is inserted into the mounting hole, the back side of the bumper The holding claw elastically contacts the peripheral portion of the mounting hole and holds the peripheral portion of the mounting hole between the flange portion, and the front end of the side surface of the cylindrical portion of the sensor body inclines toward the inside of the cylindrical portion toward the front. When the sensor body is inserted into the mounting frame There are, characterized in that the inner surface that contacts the convex portion of the mounting frame to the inclined surface is provided.

  According to the present invention, the ultrasonic sensor can be held on the bumper with a simple configuration by the holding claws, and the convex portion provided at the front end of the side surface of the cylindrical portion is provided even when the cylindrical portion of the sensor body is cylindrical. By contacting the inner surface of the mounting frame, backlash of the ultrasonic sensor main body can be prevented.

According to a second aspect of the present invention, in the first aspect of the present invention, a notch portion is formed in the body portion of the mounting frame in the front-rear direction, and a rib is provided at a position facing the notch portion in the cylindrical portion of the sensor body. The rib is slid along the notch so that the sensor body is positioned when the sensor main body is inserted into the mounting frame, and the convex portion is not opposed to the notch. It is characterized by providing.
According to the present invention, by providing the convex portion at a position that does not face the notch portion, the area of the convex portion that comes into contact with the inner surface of the mounting frame increases, so that the backlash of the ultrasonic sensor main body can be further prevented. .

  According to a third aspect of the present invention, in the invention according to any one of the first or second aspects, the holding claw is characterized in that an elastic contact surface that elastically contacts the back surface of the bumper is an arc-shaped surface having an arcuate cross section. To do.

  According to this invention, the range of the thickness dimension of the bumper which can be attached can be made wider.

  As described above, according to the present invention, there is an effect that the backlash of the ultrasonic sensor main body can be prevented with a simple configuration even when the ultrasonic microphone housing is cylindrical.

It is a perspective view which shows schematic structure of the ultrasonic sensor of this invention. (A)-(c) It is a figure which shows the structure of the bezel same as the above. (A)-(d) It is a figure which shows the structure of the sensor main body same as the above. It is a perspective view of a sensor main body same as the above. (A)-(c) It is a figure which shows the process in which the bezel same as the above is attached to a bumper. (A)-(c) It is a figure which shows the process in which the sensor main body same as the above is attached to a bezel. (A) (b) It is a figure which shows the positional relationship of a bezel same as the above and a convex part. (A) (b) It is a figure which shows the positional relationship of a bezel same as the above and a convex part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
A schematic configuration will be described with reference to a perspective view of the ultrasonic sensor of the present embodiment shown in FIG. The ultrasonic sensor of the present embodiment is composed of two members: a sensor main body 1 provided with an ultrasonic microphone 4 and a bezel 2 that serves as an attachment frame of the sensor main body 1. The bezel 2 is inserted into the mounting hole 31 formed in the bumper 3 of the vehicle in the direction of arrow A and temporarily fixed to the bumper 3, and then the sensor body 1 is fitted and inserted into the bezel 2 in the direction of arrow B. The ultrasonic sensor is supported by the bumper 3 by 2 holding the sensor body 1.

  The ultrasonic sensor supported by the bumper 3 transmits ultrasonic pulses intermittently from the ultrasonic microphone 4 housed in the housing front portion 12 of the sensor body 1, and then transmits the reflected wave from the obstacle. The sonic microphone 4 receives the wave and measures the distance to the obstacle by the time difference from the transmission of the ultrasonic pulse to the reception. Therefore, an electronic circuit board (not shown) is accommodated in the housing rear portion 11 of the sensor body 1, and the electronic circuit board includes a transmission interval setting circuit, an oscillation circuit, a reception circuit, a detection gate circuit, an arithmetic circuit, and the like. Circuit parts are mounted. First, a reference signal for setting the transmission interval of the ultrasonic pulse is generated by the transmission interval setting circuit, and electrical vibration of a predetermined frequency is intermittently generated from the oscillation circuit at the transmission interval set by the reference signal, The ultrasonic microphone 4 is driven by this electric vibration to transmit an ultrasonic pulse. If there is an obstacle, the reflected wave is received by the ultrasonic microphone 4 and an electric signal is output. The received signal output from the ultrasonic microphone 4 is input to the arithmetic circuit via the detection gate circuit after a signal corresponding to the generation period of the received signal is extracted by the receiving circuit. The detection gate circuit sets a detection gate period after transmitting the ultrasonic pulse based on the reference signal from the transmission interval setting circuit, and allows the signal to pass only during the detection gate period. Then, the arithmetic circuit obtains the distance to the obstacle.

  Below, the detailed structure of the ultrasonic sensor of this embodiment is demonstrated. First, the bezel 2 will be described with reference to FIGS. 2A is a front view of the bezel 2, FIG. 2B is a side view, and FIG. 2C is a perspective view. In the following description, the horizontal direction in FIG. 2A is defined as the horizontal direction, the vertical direction is defined as the vertical direction, and the horizontal direction in FIG.

  The bezel 2 is a synthetic resin molded product formed using a synthetic resin having elasticity, and penetrates through a mounting hole 31 formed in a substantially circular shape in the bumper 3 of the vehicle, and has a substantially cylindrical shape with a hollow structure inside. The body part 21 formed on the front side and the front end peripheral edge of the body part 21 are widened in a flange shape toward the inside and outside of the body part 21, and when the bezel 2 is attached to the bumper 3, the attachment on the surface side of the bumper 3 The peripheral portion of the hole 31 is composed of a flange portion 22 with which the rear surface abuts.

  The body portion 21 of the bezel 2 is provided with four openings 212 that are opened in a substantially rectangular shape so as to be spaced apart from each other in the circumferential direction, and holding claws 211 are provided inside the openings 212. The holding claw 211 has a pair of bending pieces 211 a extending forward from the rear end of the periphery of the opening 212, and a part of the holding claws 211 outward from the opening surface of the opening 212 in front of each bending piece 211 a. A pair of protruding holding claw main bodies 211b and a support piece 211c supported at both ends by the pair of holding claw main bodies 211b. The holding claw body 211b is formed with a guide surface 211d that is inclined so that the amount of protrusion from the opening surface of the opening 212 increases toward the front. The elastic contact surface 211e that elastically contacts the back surface of the bumper 3 is formed in an arc-shaped surface having an arcuate cross section. Further, when the housing front portion 12 of the sensor body 1 is fitted into the body portion 21, a stopper projection 211f that prevents the bezel 2 from coming off from the mounting hole 31 protrudes outward from the holding claw body 211b. Has been.

  In addition, a pair of cutout portions 213 opened from the rear end to the front end of the trunk portion 21 is formed in the vicinity of the opening portion 212 provided below the trunk portion 21 in the circumferential direction. By inserting a pair of positioning ribs 12d provided on the sensor main body 1 to be described later into the notch 213, the circumferential position when the sensor main body 1 is inserted into the bezel 2 is restricted. .

  In addition, a holding claw 214 protruding outward from the body part 21 is formed behind the opening part 212 provided below the body part 21. The holding claw 214 is formed with an inclined surface in which the amount of protrusion decreases from the front to the rear. When the housing front part 12 is fitted into the body part 21, the holding claw 214 is engaged with an opening 112a provided in the sensor body 1 described later, thereby fixing the sensor body 1 to the bezel 2. Yes.

  Next, the sensor body 1 will be described with reference to FIGS. 3 (a) to 3 (d) and FIG. 3A is a front view of the sensor body 1, FIG. 3B is a top view, FIG. 3C is a bottom view, and FIG. 3D is a right side view. FIG. 4 is a perspective view of the sensor body 1. In the following description, the horizontal direction in FIG. 3A is defined as the horizontal direction, the vertical direction is defined as the vertical direction, and the horizontal direction in FIG.

  The sensor main body 1 is a synthetic resin molded product formed using a synthetic resin. The sensor main body 1 is a substantially rectangular box shape having an open rear surface, and a housing rear portion 11 in which an electronic circuit board (not shown) is housed, and a housing rear portion 11. The front part 12 of the housing that protrudes in a cylindrical shape from the front side of the housing, the ultrasonic microphone 4 and the vibration isolation member 41 accommodated therein, and the right side surface of the rear part 11 of the housing are projected in a substantially rectangular shape, and the connector is It is comprised with the housing side part 13 connected.

  The housing front portion 12 is formed in a substantially cylindrical shape having an open front surface, and is housed by inserting a vibration isolating member 41 holding the ultrasonic microphone 4 from the front surface. The vibration isolation member 41 is formed of a bottomed cylindrical elastic material, houses the columnar ultrasonic microphone 4 therein, and the inner surface of the vibration isolation member 41 and the outer surface of the ultrasonic microphone 4 are in contact with each other. Is holding in. The front end surface of the ultrasonic microphone 4 and the front end periphery of the vibration isolation member 41 are formed flush with each other. Further, a flange portion that is inclined outwardly from the front end periphery of the vibration isolation member 41 is extended, and the rear surface of the flange portion contacts the front end periphery of the housing front portion 12 when stored in the housing front portion 12. . Then, the vibration isolating member 41 holding the ultrasonic microphone 4 is inserted from the front surface of the housing front portion 12, and the outer surface of the vibration isolating member 41 and the inner surface of the housing front portion 12 come into contact with each other. The sensor body 1 is housed. Further, a substantially rectangular opening (not shown) is formed in the rear surface of the vibration isolating member 41 and the housing front portion 12, and a pair of terminals (provided in the ultrasonic microphone 4 through the opening) ( (Not shown) is electrically connected to the electronic circuit board accommodated in the housing rear part 11.

  Further, an inclined surface 12b is formed at the front end of the side surface 12a of the substantially cylindrical housing front portion 12 so as to be inclined inward toward the front. The inclined surface 12b is formed so that when the housing claw 211 provided on the body part 21 is bent inward when the housing front part 12 of the sensor body 1 is fitted into the body part 21 of the bezel 2, It is formed so as to facilitate the insertion of the housing front portion 12 by being guided outward and pushed up.

  Further, on the inclined surface 12b, four convex portions 12c are provided apart from each other in the circumferential direction. The convex portion 12 c is provided at a position where the opening 212 and the notch 213 of the bezel 2 do not face each other when the sensor main body 1 is inserted into the bezel 2. The protrusion 12c has a protruding amount that increases from the rear end to the front end of the inclined surface 12b, the side surface of the protrusion 12c is formed flush with the side surface 12a of the housing front portion 12, and the front end surface of the protrusion 12c. Is formed flush with the front end of the housing front portion 12.

  A pair of positioning ribs 12 d protrude from the side surface 12 a of the housing front portion 12 and the front surface of the housing rear portion 11 at a position facing the notch portion 213 formed in the body portion 21 of the bezel 2. When the sensor body 1 is inserted into the bezel 2, the positioning rib 12 d is inserted into the notch 213, thereby restricting the position of the sensor body 1 in the circumferential direction with respect to the bezel 2.

  Next, the housing rear portion 11 will be described. The housing rear portion 11 is formed in a substantially rectangular box shape that is long in the left-right direction and has an open rear surface, and houses an electronic circuit board (not shown) therein. The electronic circuit board is electrically connected to a pair of connector terminals (not shown) simultaneously formed on the housing front portion 11 and a pair of terminals (not shown) of the ultrasonic microphone 4. It is fixed to the housing rear part 11 by welding ribs (not shown) directed to the housing. Further, a shield member (not shown) made of a conductive material is insert-molded on the inner surface of the housing rear portion 11 so as to surround the electronic circuit board to be accommodated. Further, a cover 5 is provided so as to cover the rear surface of the opened housing rear portion 11.

  Further, a holding portion 111 is formed on the upper surface of the housing rear portion 11, and a holding portion 112 is formed from the lower surface. The holding portion 111 has a support wall 111a projecting upward from the front end portion on the upper surface of the housing rear portion 11, and is spaced apart from the support wall 111a in the right direction, and has a cross section L extending upward from the front end portion and the right end portion. A support wall 111b protruding in a letter shape, a pair of support pieces 111c extending rearward from the right end of the support wall 111a and the left end of the support wall 111b, and a holding piece supported at the rear of the support piece 111c 113. The holding portion 112 is formed vertically symmetrical with the holding portion 111 on the lower surface of the housing rear portion 11, and includes a support wall 112a protruding downward and a support wall 112b protruding in an L-shaped cross section. The support wall 112a and the support wall 112b are configured to include a pair of support pieces 112c extending rearward and a holding piece 114 supported by the support pieces 112c.

  The holding pieces 113 and 114 are formed in a plate shape that is long in the front-rear direction, the rear portions are supported by the support pieces 111c and 112c, and are arranged so as to face the upper surface and the lower surface of the housing rear portion 11, respectively. It is flexible. In addition, openings 113 a and 114 a are formed in front portions of the holding pieces 113 and 114. In front of the opening 113a of the holding piece 113, a coupling claw 113b is provided in a downward direction, and is formed with an inclined surface whose protruding amount becomes smaller toward the front end of the holding piece 111. When the sensor body 1 is inserted into the bezel 2, the coupling claw 113 b engages with the opening 212 provided above the body portion 21 of the bezel 2. Further, the coupling claw 214 of the bezel 2 described above engages with the opening 114 a of the holding piece 114 in an uneven manner. That is, when the sensor body 1 is inserted into the bezel 2, the holding pieces 113 and 114 bend in the vertical direction, and the coupling claw 113 b of the holding piece 113 and the opening 212 of the bezel 2 and the coupling claw 214 of the bezel 2 are held. The bezel 2 and the sensor main body 1 are coupled by the concave and convex engagement with the opening 114a of the piece 114.

  In addition, release pieces 113c and 114c are formed at the rear portions of the holding pieces 113 and 114, respectively. When the release pieces 113c and 114c are bent in the vertical direction so as to approach each other, the front ends of the holding pieces 113 and 114 are bent away from each other. Accordingly, the concave-convex engagement between the coupling claw 113b and the opening 212 and between the coupling claw 214 and the opening 114a can be released, so that the sensor body 1 can be easily detached from the bezel 2.

  Further, a pair of side wall portions 115 are formed on the front surface of the housing rear portion 11. The side wall portion 115 is formed so as to cover the body portion 21 of the bezel 2 from the left and right when the sensor body 1 is inserted into the bezel 2, and the rib provided on the side wall portion 115 is the body portion 21 of the bezel 2. The bezel 2 is supported by abutting on the outer periphery.

  Next, the housing side portion 13 will be described. The housing side portion 13 projects from the right side surface of the housing rear portion 11 with a hollow structure and has a substantially rectangular cross section, and a connector portion 13a to which a harness connector (not shown) is coupled, and a contact provided on the harness connector. And a pair of contacts 13b that can contact each other. The contact 13 b is insert-molded in the sensor body 1 and is continuous with a connector terminal (not shown) provided in the housing rear portion 11. Further, a rib 13c continuous from the left end to the right end is provided on the rear surface in the connector portion 13a to prevent the harness connector from being reversely inserted.

  Next, a procedure for attaching the ultrasonic sensor of the present embodiment to the bumper 3 of the vehicle will be described with reference to FIGS. 5 (a) to 5 (c) and FIGS. 6 (a) to 6 (c). 5A is a perspective view before the bezel 2 is attached to the bumper 3, FIG. 5B is a perspective view after the bezel 2 is attached to the bumper 3, and FIG. 5C is a side view after the bezel 2 is attached to the bumper 3. FIG. is there. 6A is a perspective view before the sensor body 1 is attached to the bezel 2, FIG. 6B is a perspective view after the sensor body 1 is attached to the bezel 2, and FIG. 6C is a view after the sensor body 1 is attached to the bezel 2. It is a side view.

  As shown in FIG. 5A, the bumper 3 has a mounting hole 31 that penetrates the front and back in advance. The inner peripheral shape of the attachment hole 31 is substantially the same circular shape as the outer peripheral shape of the body portion 21 of the bezel 2, and a convex portion 32 is formed at a position facing the notch portion 213 of the bezel 2, and the notch portion 213 is formed. The convex portion 32 is inserted into the front, thereby restricting the circumferential position when the bezel 2 is inserted. Then, the bezel 2 is inserted into the mounting hole 31 from the surface side of the bumper 3 toward the arrow A direction. When the bezel 2 is inserted into the mounting hole 31 of the bumper 3, the guide surface 211 d formed on each holding claw 211 comes into contact with the inner peripheral surface of the mounting hole 31, so that the bending piece 211 a is inside the body portion 21. The elastic contact surface 211e of the holding claw body 211b is finally elastically contacted with the peripheral portion of the attachment hole 31. 5B and 5C, the peripheral portion of the mounting hole 31 is held between the flange portion 22 and the holding claw 211, so that the bezel 2 is temporarily fixed to the bumper 3. However, in this state, the holding claw main body 211 b is pushed by the opening edge of the mounting hole 31 on the back surface of the bumper 3, and the bending piece 211 a is bent inward of the body portion 21.

  Next, as shown in FIG. 6A, the sensor body 1 is inserted in the direction of arrow B from the back of the bezel 2 on the back side of the bumper 3. Then, as shown in FIGS. 6B and 6C, the housing front portion 12 is fitted into the body portion 21, whereby the body portion 21 of the bezel 2 and the housing front portion 12 of the sensor body 1 are coupled. . Further, when the housing front portion 12 is fitted into the body portion 21, the bezel is formed by the bending piece 211a being elastically contacted with the side surface 12a and the inclined surface 12b of the housing front portion 12 and pushing up to the outside of the body portion 21. 2 is fixed in a state where the peripheral portion of the mounting hole 31 is held between the flange portion 21 and the holding claw 211.

  That is, by inserting the bezel 2 into the mounting hole 31 of the bumper 3 and holding the peripheral portion of the mounting hole 31 with the flange portion 22 and the plurality of holding claws 211, the bezel 2 is temporarily fixed to the bumper 3. By inserting the housing front portion 12 into the body portion 21 of the bezel 2 from the back side of the bumper 3, the sensor body 1 can be attached to the bezel 2, and the holding claws 211 provided on the bezel 2 and the housing The holding claw 211 is prohibited from bending inward of the bezel 2 by contacting the side surface 12 a of the front portion 12, and the ultrasonic sensor is fixed to the bumper 3.

  By using the holding claws 211 as the support means for the bumper 3 as described above, it is possible to easily attach the ultrasonic sensor to the bumper 3 with a simple structure without using a retainer clip or a spring as in the prior art.

  Further, as described above, the ultrasonic sensor of the present embodiment is provided with the convex portion 12 c on the inclined surface 12 b of the housing front portion 12 of the sensor body 1. The positional relationship between the bezel 2 and the convex portion 12c is shown using FIGS. 7 (a), 7 (b) and 8 (a), 8 (b). Fig.7 (a) is a front view of an ultrasonic sensor, (b) is CC sectional drawing in Fig.7 (a). Fig.8 (a) is a side view of an ultrasonic sensor, (b) is DD sectional drawing in Fig.7 (a). Note that CC in FIG. 7A is an extension of a line connecting the convex portions 12c facing each other with the center of the ultrasonic microphone 4 as a midpoint.

  As shown in FIG. 7B and FIG. 8B, the convex portion 12c is formed on the inclined surface 12b, so that the front end of the convex portion 12c abuts on the rear surface of the flange portion 22, and the convex portion 12c Since the side surface is close to the inner surface of the body portion 21, the movement of the housing front portion 12 in the bezel 2 is restricted, and the occurrence of backlash is suppressed.

  In addition, since the holding claw 211 has an elastic surface 211e that elastically contacts the back surface of the bumper 3, the range of the thickness dimension of the mountable bumper 3 can be further widened.

  In addition, since the bezel 2 is provided with a stopper projection 211f that protrudes outward from the holding claw body 211b to prevent the bezel 2 from being removed from the mounting hole 31 when the sensor body 1 is fitted and inserted. When the sensor body 1 is inserted into the bezel 2 attached to the bumper 3, even if the bezel 2 is about to come out of the attachment hole 31, the stopper projection 211 f comes into contact with the peripheral portion of the attachment hole 31. Therefore, the bezel 2 can be prevented from jumping out of the bumper 3 when the sensor main body 1 is inserted into the bezel 2.

  Further, the coupling claw 113 b of the holding piece 113 provided on the upper surface of the housing rear portion 11, the opening 212 provided in the body portion 21 of the bezel 2, and the coupling claw 214 provided on the body portion 21 and the lower surface of the housing rear portion 11. The sensor body 1 can be securely fixed to the bezel 2 by engaging the opening 114 a of the holding piece 114 provided on the concave and convex. Further, since the bezel 2 is sandwiched between the holding pieces 113 and 114 provided in the housing rear portion 11, the position of the sensor body 1 with respect to the bezel 2 is stabilized, and the holding pieces 113 and 114 are flexible in the vertical direction. By operating the release pieces 113c and 114c to bend the holding pieces 113 and 114 in a direction away from the bezel 2, the concave and convex engagement between the bezel 2 and the holding pieces 113 and 114 can be released. The main body 1 can be easily removed. As a result, the sensor body 1 can be replaced without removing the bezel 2 from the bumper 3 when the sensor body 1 fails or the like, and high maintainability can be obtained. Further, when the sensor body 1 fails, only the sensor body 1 needs to be replaced, and the bezel 2 need not be replaced. Therefore, it is possible to reduce the number of parts to be replaced, leading to a reduction in maintenance costs.

DESCRIPTION OF SYMBOLS 1 Sensor main body 2 Bezel 3 Bumper 4 Ultrasonic microphone 11 Housing rear part 12 Housing front part 12c Convex part 13 Housing side part 21 Body part 22 Flange part 31 Mounting hole 211 Holding nail

Claims (3)

A cylindrical body portion penetrating through a mounting hole formed in a bumper of a vehicle, and a flange portion whose front end periphery is widened in a flange shape so that the rear surface abuts the peripheral portion of the mounting hole on the bumper surface side. A mounting frame,
A cylinder part containing an ultrasonic microphone is projected from the front part of the container containing the electronic circuit board, and the cylinder part is composed of a sensor body that is inserted into the body part of the mounting frame on the back side of the bumper. ,
A plurality of holding claws are provided on the body portion of the mounting frame so as to be spaced apart from each other in the circumferential direction.When the mounting frame is inserted into the mounting hole, the holding claws elastically contact the peripheral portion of the mounting hole on the back side of the bumper. Hold the periphery of the mounting hole between the flange and
The front end of the side surface of the cylinder portion of the sensor body is formed as an inclined surface that inclines toward the inside of the cylinder portion toward the front, and when the sensor body is inserted into the attachment frame, the inclined surface contacts the inner surface of the attachment frame. An ultrasonic sensor characterized in that a convex portion is provided.   A notch portion is formed in the body portion of the mounting frame in the front-rear direction, and a rib is provided at a position facing the notch portion in the cylindrical portion of the sensor body, and the rib extends along the notch portion. 2. The ultrasonic sensor according to claim 1, wherein the sensor body is positioned when the sensor main body is inserted into the mounting frame by sliding, and the convex portion is provided at a position not facing the notch portion. .   3. The ultrasonic sensor according to claim 1, wherein the holding claw has an arc-shaped surface having a cross-sectional arc shape that is elastically in contact with the back surface of the bumper.

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