JP2012242353A - Retainer for sensor mounting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retainer for sensor mounting capable of improving location accuracy to a bumper hole of the retainer with a simple method.SOLUTION: A center position member 4 is configured by including: a core bar part 41 extending out in a coaxial direction to a center axis of a retainer hole 22a; an engagement projection 44 (core boar side connection part) extending out in the direction of being away from the core bar part 41 with the core bar part 41 as a base end side to arrange the core bar part 41 coaxially with respect to the retainer hole 22a by being connected to an opening part 24a (retainer side connection part) of a retainer body 21; and a plurality of spring parts 43 extending out in the shape of an arc with the core bar part 41 as a base end side in a planer view to elastically deform so as to approach the core bar part 41 such that the core bar part 41 is arranged coaxially with respect to a bumper hole 3a while being in contact with an inner circumferential part of the bumper hole 3a. The retainer hole 22a is arranged coaxially with respect to the bumper hole 3a by cooperation between the center position member 4 and the retainer 2.

Description

  The present invention relates to a sensor mounting retainer used when a sensor represented by, for example, an ultrasonic sensor is mounted on a bumper.

  As a structure for attaching a sensor typified by an ultrasonic sensor to a bumper, a technique is known in which a retainer is attached to the inner side surface (back surface) in the vicinity of a bumper hole formed in the bumper, and the sensor is attached to the bumper via the retainer. (For example, refer to Patent Document 1 below). According to such an attachment structure, the sensor can be incorporated into the bumper without impairing the design of the bumper.

  However, since the bumper is not provided with any guides such as protrusions that guide the retainer to the optimal mounting position on the bumper side, it is difficult to obtain the positional accuracy of the retainer with respect to the bumper hole. There was a problem that misalignment was likely to occur between the bumper holes. When such a positional deviation occurs, the design property is deteriorated due to the central deviation between the sensor and the bumper hole, and the detection accuracy of the sensor may be lowered.

JP-T-2001-527480

  The present invention has been made to cope with the above-described problems, and an object of the present invention is to provide a retainer for mounting a sensor that can improve the positional accuracy of the retainer with respect to the bumper hole by a simple method.

Means for Solving the Problems and Effects of the Invention

In order to achieve the above object, the present invention provides a sensor including a cylindrical sensor body and a detection unit incorporated in the tip thereof, and a circular bumper hole in which the detection unit is formed in the bumper. A retainer for mounting a sensor attached to the inner surface of the bumper so as to be exposed to the outside of the bumper,
The retainer has a retainer body that supports the sensor so that the sensor body is disposed at a predetermined position around its central axis.
A retainer body as a base end side, extending in a direction away from the retainer body, and having a pasting portion to be affixed to a bumper at a distal end portion;
The retainer body is formed with a circular retainer hole that allows the sensor body to be inserted from the inside of the retainer body to the bumper hole side corresponding to the bumper hole.
A core rod portion extending coaxially with the central axis of the retainer hole, and extending in a direction away from the core rod portion with the core rod portion as a base end side, and connected to the retainer side connection portion of the retainer body A core rod side connecting portion that coaxially arranges the core rod portion with respect to the retainer hole, and the core rod portion extends in an arc shape in plan view with the core rod portion as a base end side, and comes into contact with the inner peripheral portion of the bumper hole A center positioning member including a plurality of spring portions that are elastically deformed so as to approach the core rod portion so that the core rod portion is coaxially disposed with respect to the bumper hole in the state, The retainer hole is attached to the bumper in a state of being coaxially arranged with respect to the bumper hole by the cooperation of the center positioning member and the retainer.

In this case, the retainer for mounting the sensor of the present invention includes, for example, an insertion step of inserting the center positioning member into the bumper hole in a state where the retainer and the center positioning member are integrated.
A pasting step of pasting the pasting portion of the retainer on the back surface of the bumper with the center positioning member inserted into the bumper hole;
The center positioning member can be separated from the retainer, and can be attached to the bumper by a process including a separation step in which only the retainer is attached to the bumper.

  The retainer for mounting the sensor of the present invention is attached to the bumper in a state where the retainer hole is coaxially arranged with respect to the bumper hole in cooperation with the center positioning member. That is, by inserting the center positioning member into the bumper hole in a state where the retainer and the center positioning member are integrated, the center positioning member is positioned coaxially with respect to the bumper hole. The hole and the bumper hole are arranged coaxially. Thus, since the centering of the retainer is realized by the cooperation of the retainer and the center positioning member, the positional accuracy of the retainer with respect to the bumper hole can be easily improved.

  Moreover, according to the retainer of this invention, the attachment workability | operativity of a retainer can be improved by the simple and easy insertion process, sticking process, and isolation | separation process.

  In this case, the center positioning member and the retainer are configured as separate parts in advance, so that the core rod side connecting portion and the retainer side connecting portion can be engaged with each other and integrated in the engaged state. It is good to be configured. According to this, it becomes possible to reuse the center positioning member as a dedicated member (jig, tool) for attaching the retainer.

  The core rod side connecting portion and the retainer side connecting portion may be configured to be engaged by moving the center positioning member in the direction of the central axis of the retainer hole. According to this, the center positioning member and the retainer can be easily integrated by moving the center positioning member and the retainer relative to each other in the direction of the center axis of the retainer hole.

  Further, the center positioning member and the retainer may be configured in advance as one component, and the core rod side connecting portion and the retainer side connecting portion may be integrally connected at the connecting portion. According to this, it becomes possible to give the retainer itself a centering function while suppressing an increase in the number of parts.

  In this case, it is preferable that a plurality of sets of connecting portions be provided. According to this, the connection strength between the center positioning member and the retainer can be ensured.

  The core rod portion may be formed in a cylindrical shape, and the core rod side connection portion may be configured to be provided radially at equal angular intervals in the circumferential direction of the core rod portion. In this case, it is preferable that the base end portion of the spring portion is integrally connected to the core rod side connection portion, and the core rod side connection portion is formed as a rib for receiving an input to the spring portion. According to this, the rigidity of the core rod part can be ensured.

  The tip of the core rod side connection portion on the bumper hole side is preferably formed in a tapered shape. According to this, even when the core rod portion is inserted into the bumper hole at an angle slightly deviated from the central axis of the bumper hole, the core rod portion can be easily inserted into the bumper hole. Can be successfully continued.

  The connecting portion may be divided by pushing the center positioning member toward the bumper hole, and the center positioning member and the retainer may be separated from each other by the cutting. According to this, the center positioning member can be separated from the retainer by pushing the center positioning member toward the bumper hole side with respect to the retainer. For this reason, when the center positioning member is separated from the retainer, the rotational moment around the central axis does not act on the retainer, so that it is possible to satisfactorily prevent the sticking position of the sticking portion from being shifted around the central axis.

The perspective view which concerns on Example 1 of this invention and shows the state which attached the ultrasonic sensor to the bumper via the retainer. The perspective view which shows both components before attaching an ultrasonic sensor to a retainer. The top view of a retainer. The perspective view which shows both components before a center positioning member is integrated in a retainer. The elements on larger scale which show the engagement state of a retainer side connection part and a core-bar side connection part by a partial fracture. The perspective view which shows the state which attached the retainer and the center positioning member to the bumper. The top view of FIG. The perspective view which shows the state which isolate | separated the center positioning member from the state shown in FIG. The perspective view which shows both components before it concerns on the modification of Example 1 and a center positioning member is integrated in a retainer. The perspective view which concerns on Example 2 of this invention and shows the retainer which integrally formed the center positioning member. The front view of FIG. The side view of FIG. The top view of FIG. FIG. 11 is a bottom view of FIG. 10. The perspective view which shows only a center positioning member. The front view which shows only a center positioning member. The front view of the retainer except the center positioning member. The side view of a retainer except a center positioning member. The perspective view which shows the state which attached the retainer and the center positioning member to the bumper. The perspective view which shows the state which isolate | separated the center positioning member from the state shown in FIG. The top view of FIG. The bottom view of FIG. (A) is a perspective view which shows the connection state of a retainer side connection part and a core-bar side connection part concerning the modification of Example 2. FIG. (B) is front sectional drawing of (a). FIG. 9A is a perspective view illustrating a connection state between a retainer side connection portion and a core rod side connection portion according to another modification of the second embodiment. (B) is front sectional drawing of (a). FIG. 9A is a perspective view showing a connection state between a retainer side connecting portion and a core rod side connecting portion according to still another modified example of the second embodiment. (B) is front sectional drawing of (a).

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

  FIG. 1 is a perspective view showing a state in which an ultrasonic sensor 1 (hereinafter simply referred to as a sensor 1) is attached to a bumper 3 through a sensor mounting retainer 2 (hereinafter simply referred to as a retainer 2) of the present invention. FIG. 2 is a perspective view showing both parts before the sensor 1 is attached to the retainer 2.

  The sensor 1 is a transmitter / receiver type that vibrates a piezoelectric ceramic vibrator by a piezoelectric effect, emits ultrasonic waves, and converts ultrasonic vibrations incident on the piezoelectric ceramic vibrator into an electric signal. 11, a housing portion 12, and the like.

  The sensor body 11 is formed in a stepped cylindrical shape having a tip 11a (lower end) having a minimum diameter. A microphone 13 (detection unit) incorporating a piezoelectric ceramic vibrator is incorporated in the distal end portion 11 a of the sensor body 11. The intermediate portion 11b of the sensor body 11 has a plurality of positioning portions 11c that perform positioning with the retainer 2 when the sensor body 11 is attached to the retainer 2 and prevent rotation of the sensor body 11 around the central axis. Is provided.

  The casing 12 is formed in a size that includes the sensor body 11 in plan view. The housing part 12 accommodates a control board, a filler, etc. (not shown). A connection terminal portion 14 for connecting a cable (not shown) is provided on the side surface of the housing portion 12 opposite to the side where the sensor body 11 is disposed.

  Moreover, when the sensor 1 is attached to the retainer 2 on both side surfaces of the housing 12 where the connection terminal portion 14 is not provided, the sensor 1 is engaged with an opening 24a of the retainer 2 described later. Engagement protrusions 12 a that prevent the retainer 2 from coming out are provided.

  The retainer 2 is formed of a resin material such as polybutyne terephthalate, for example, and a retainer main body 21 that supports the sensor 1 so that the sensor main body 11 is disposed at a predetermined position around the central axis thereof, and the retainer main body 21 extends from the retainer main body 21 in the direction of the base end side, and a pair of sticking portions 31, 31 attached to the bumper 3 on the tip end side, and the extension amount is set to be shorter than those sticking portions 31, 31. And a pair of other pasting portions 32, 32.

  As shown in FIGS. 2 and 3, the retainer body 21 includes a substantially rectangular bottom wall 22 and a pair of side walls 23, 23 erected so as to face each other with the peripheral edge of the bottom wall 22 as a base end side. , And a pair of other side walls 24, 24 set higher than the side walls 23, 23.

  In the bottom wall 22, a circular retainer hole 22 a for inserting the sensor body 11 from the inside of the retainer body 21 to the bumper hole 3 a side is formed corresponding to the circular bumper hole 3 a formed in the bumper 3. . The retainer hole 22a has a larger diameter than the bumper hole 3a.

  In each side wall 23, when a center positioning member 4 described later is attached to the retainer 2, a corresponding positioning rib 42 in the center positioning member 4 is guided in the direction of the central axis, and the center positioning member 4 serves as a retainer main body. A guide recess 23 a that prevents rotation about the central axis with respect to 21 is provided.

  Each side wall 24 is set to have an inner width that is substantially the same as the outer width of the casing 12 of the sensor 1, and a penetrating opening 24 a is formed at each corresponding position in the lower part of each side wall 24. Yes. Each opening 24 a has a function of engaging with the engagement protrusion 12 a of the sensor 1.

  Each sticking portion 31 extends obliquely downward from the peripheral edge portion of the bottom wall 22 on the side where the side walls 23 are provided. On the other hand, each sticking part 32 is extended diagonally downward from the peripheral part of the side in which each side wall 24 in the bottom wall 22 was provided. In addition, the amount of extension downward is set so that the lower surfaces of the pasting portions 31 and 32 are located on substantially the same plane. The retainer 2 is affixed to the bumper 3 by an adhesive member such as a double-sided adhesive tape attached to the back surfaces of the affixing portions 31 and 32.

  As shown in FIG. 1, when the sensor 1 is attached to the retainer 2, the sensor main body 11 is inserted into the retainer hole 22 a of the retainer main body 21, and the tip end portion 11 a is arranged to protrude below the retainer main body 21. Is done. Further, the connection terminal portion 14 is disposed so as to protrude beyond one of the side walls 23 and 23.

  As shown in FIG. 4, the retainer 2 described above is configured to be attached to the bumper 3 using a center positioning member 4 which is a separate part. The center positioning member 4 includes a core bar part 41, a plurality of positioning ribs 42, a spring part 43, and an engagement protrusion 44.

  The core rod part 41 is formed in a two-stage substantially stepped cylindrical shape, and the upper side in the figure is a large diameter part 41a and the lower side is a small diameter part 41b. The large diameter portion 41a is set larger than the diameter of the retainer hole 22a, while the small diameter portion 41b is set smaller than the diameter of the retainer hole 22a.

  The positioning ribs 42 are integrally formed at equal angular intervals in the circumferential direction of the large diameter portion 41a and in the central axis direction on the side surface of the large diameter portion 41a. In the first embodiment, an example is shown in which four positioning ribs 42 are provided at 90 ° intervals in the circumferential direction of the large-diameter portion 41a. Each positioning rib 42 is guided in the direction of the central axis by the corresponding guide recess 23a in a state where rotation around the central axis is prevented with respect to the retainer body 21.

  Each spring portion 43 is integrally formed at equal angular intervals in the circumferential direction of the small diameter portion 41b so as to extend in an arc shape in plan view with the small diameter portion 41b of the core rod portion 41 as the base end side. In the first embodiment, an example in which three spring portions 43 are provided at 120 ° intervals in the circumferential direction of the small diameter portion 41b is shown.

  The maximum diameter formed by virtually connecting the portions of each spring portion 43 that protrude from the core rod portion 41 to the maximum is smaller than the diameter of the retainer hole 22a, but larger than the diameter of the bumper hole 3a. Is set. When all of the spring parts 43 come into contact with the inner peripheral part of the bumper hole 3a, each spring part 43 bends by substantially the same amount and elastically deforms in a direction approaching the core bar part 41. That is, when the core bar part 41 is inserted through the bumper hole 3a, the core bar part 41 is arranged coaxially with respect to the bumper hole 3a.

  Each engagement protrusion 44 is formed so as to project away from the core rod portion 41 with the large diameter portion 41a of the core rod portion 41 as the base end side. Each engaging protrusion 44 engages with the opening 24 a in each side wall 24 of the retainer main body 21 with the lower end of each positioning rib 42 in contact with the bottom wall 22 of the retainer main body 21. In the first embodiment, each engaging projection 44 of the center positioning member 4 functions as a core rod side connecting portion of the present invention, and each opening 24a of the retainer 2 functions as a retainer side connecting portion of the present invention. In the first embodiment, the opening 24a that engages with the engagement protrusion 12a of the sensor 1 is configured to function as a retainer-side connecting portion. However, in addition to or instead of the opening 24a, for example, the retainer main body 21 has a retainer. You may make it provide the exclusive site | part which functions as a side connection part. In this case, not only a case where a plurality of core rod side connection portions and retainer side connection portions are provided, but only one set may be provided.

  Next, a method for attaching the retainer 2 to the bumper 3 will be described. First, in the preparation step, the center positioning member 4 is incorporated into the retainer 2 (see FIG. 4). In this case, the positioning ribs 42 of the center positioning member 4 are aligned with the guide recesses 23a of the retainer body 21 while keeping the retainer hole 22a of the retainer body 21 and the core rod portion 41 of the center positioning member 4 coaxial. In this way, the small diameter portion 41b of the center positioning member 4 is inserted through the retainer hole 22a.

  As the small-diameter portion 41b of the center positioning member 4 is inserted into the retainer hole 22a, the engagement protrusions 44 of the center positioning member 4 separate the side walls 24 of the retainer main body 21 from each other as shown in FIG. It finally engages with each opening 24a while bending in the direction. Alternatively, the side walls 24 may be bent in advance in a direction away from each other with a finger or the like, and the engagement protrusions 44 may be engaged with the openings 24a in this state.

  Next, in the inserting step, the center positioning member 4 is inserted into the bumper hole 3a in a state where the retainer 2 and the center positioning member 4 are integrated (see FIGS. 6 and 7). In this insertion step, when all the spring portions 43 are in contact with the circumferential surface of the bumper hole 3a, the core bar portion 41 is disposed coaxially with respect to the bumper hole 3a.

  Next, in the pasting step, the pasting portions 31 and 32 of the retainer 2 are pasted on the back surface of the bumper 3 with the center positioning member 4 inserted into the bumper hole 3a (see FIGS. 6 and 7). By this sticking step, the retainer 2 can be attached to the bumper 3 in a state where the retainer hole 22a is arranged coaxially with respect to the bumper hole 3a.

  Finally, in the separation step, the side walls 24 are bent in a direction away from each other, the engagement state between the engagement protrusions 44 and the openings 24a is released, and the center positioning member 4 is removed from the retainer hole 22a. It moves linearly in the direction of moving away (return), that is, the center positioning member 4 is pulled out from the retainer hole 22a and separated from the retainer 2, and only the retainer 2 is attached to the bumper 3 (see FIG. 8). If the sensor 1 is incorporated in the retainer 2, the sensor body 11 can be arranged coaxially with respect to the bumper hole 3a.

  As is clear from the above description, the retainer 2 of the first embodiment is formed in the bumper 3 in a state where the retainer hole 22a is coaxially disposed with respect to the bumper hole 3a in cooperation with the center positioning member 4. It is attached. Thus, since the center positioning of the retainer 2 is realized by the cooperation of the retainer 2 and the center positioning member 4, the positional accuracy of the retainer 2 with respect to the bumper hole 3a can be easily improved.

  Moreover, according to the retainer of the said Example 1, the attachment workability | operativity of the retainer 2 can be improved according to a simple and easy insertion process, sticking process, and separation process.

  In the first embodiment, the center positioning member 4 and the retainer 2 are configured as separate parts in advance, and the engagement protrusions 44 of the center positioning member 4 and the openings 24a of the retainer 2 are mutually connected. It is configured to be engageable and integrated in the engaged state. Thereby, the center positioning member 4 can be reused as a dedicated member (jig, tool) for attaching the retainer.

  Further, the engagement protrusions 44 of the center positioning member 4 and the openings 24a of the retainer 2 are engaged by moving the center positioning member 4 in the direction of the central axis of the retainer hole 22a (forward movement). It is comprised so that. Thereby, the center positioning member 4 and the retainer 2 can be integrated easily.

(Modification of Example 1)
In the first embodiment, a plurality of positioning ribs 42 are formed on the center positioning member 4, and the center positioning member 4 is moved in the direction of the central axis of the retainer hole 22a. 44 and each opening 24a of the retainer 2 are configured to be in an engaged state. Instead of the center positioning member 4, for example, as shown in FIG. 40, and the retainer 20 to which an engagement release groove 24b that releases the engagement state with the engagement protrusion 44 is added may be used. Other configurations are substantially the same as those of the center positioning member 4 or the retainer 2 according to the first embodiment, and accordingly, corresponding members and parts are denoted by the same reference numerals and description thereof is omitted.

  Also in this modified example, as in the first embodiment, the retainer hole 22a of the retainer 20 and the core rod portion 41 of the center positioning member 40 are kept coaxial, and the small diameter portion 41b of the center positioning member 40 is retained in the retainer hole 22a. By being inserted through, the engaging protrusions 44 of the center positioning member 40 can be engaged with the openings 24 a in the side walls 24 of the retainer 20.

  However, unlike the first embodiment, in this modification, the center positioning member 40 is moved in the direction of the central axis of the retainer hole 22a in addition to moving the center positioning member 40 linearly. The small-diameter portion 41b of the center positioning member 40 can be extracted from the retainer hole 22a by rotating around and opening each engagement protrusion 44 to the outside of each opening 24a through each engagement release groove 24b. Yes. In this case, a large rotational moment does not act on the retainer 20 from the center positioning member 40 as the pasting positions of the pasting portions 31 and 32 are shifted.

  That is, in the first embodiment, prior to separating the center positioning member 4 from the retainer 2, the side walls 24 are bent in directions away from each other. If it is not sufficient, when the center positioning member 4 is linearly moved away from the retainer hole 22a, a force in the pulling direction accompanying the engagement acts on each opening 24a from each engaging projection 44. If this force exceeds a predetermined magnitude, there is a possibility that the pasting portions 31 and 32 are peeled off from the bumper 3.

  However, even if the center positioning member 40 is rotated around the central axis of the retainer 20 as in the above modification, no rotational moment acts on the retainer 20 from the center positioning member 40, and the center positioning member The center positioning member is released by releasing the engagement state between each engagement protrusion 44 (core rod side connection portion) and each opening 24a (retainer side connection portion) in accordance with the rotation around the central axis of 40. The structure in which the small-diameter portion 41b of 40 can be extracted from the retainer hole 22a (the center positioning member 40 is separated from the retainer 20) can be satisfactorily prevented from being peeled off from the bumper 3. become able to.

  In the first embodiment, the center positioning member 4 and the retainer 2 are configured as separate parts in advance, but instead, for example, as illustrated in FIGS. 10 to 18, the center positioning member 140 is integrally formed. You may comprise as the retainer 120 with a centering function.

  As shown in FIGS. 15 and 16, the center positioning member 140 includes a cylindrical core bar portion 141, and a plurality of ribs 142 and spring portions 143 formed on the outer peripheral surface of the core bar portion 141. ing.

  The core bar portion 141 is formed in a cylindrical shape. The ribs 142 are radially formed at equal angular intervals in the circumferential direction of the core bar portion 141, and are integrally formed on the side surface of the core rod portion 141 in the central axis direction. In the first embodiment, an example in which three ribs 142 are provided at intervals of 120 ° in the circumferential direction of the core bar portion 141 is shown. When the core rod portion 141 is inserted into the bumper hole 3a, the direction of the retainer 120 can be estimated from the front side of the bumper 3 using the arrangement direction of the rib 142 as a guide.

  Each rib 142 has a tip portion 142a corresponding to the lower end in the figure formed in a tapered shape, and the core rod portion 141 can be easily inserted into the bumper hole 3a. Each rib 142 is integrally connected to a base end portion of each spring portion 143 so that an input to each spring portion 143 is transmitted to the core rod portion 141 via each rib 142.

  As shown in FIGS. 17 and 18, the retainer 120 supports the sensor 1 so that the sensor main body 11 is disposed at a predetermined position around the central axis thereof, like the retainer 2 according to the first embodiment. Retainer main body 121, a pair of sticking parts 131, 131 that extend in a direction away from the retainer main body 121 with the retainer main body 121 as a base end side, and are affixed to the bumper 3 at the tip part, and more than these sticking parts 131, 131 Another pair of pasting portions 132, 132 having a short extension amount is provided.

  As shown in FIGS. 13, 17, and 18, the retainer main body 121 includes a substantially rectangular bottom wall 122 and a pair of side walls 123 erected so as to face each peripheral portion of the bottom wall 122 on the base end side. , 123 and another pair of side walls 124, 124 set higher than the side walls 123, 123.

  The bottom wall 122 is formed with a circular retainer hole 122a for inserting the sensor body 11 from the inside of the retainer body 121 to the bumper hole 3a side corresponding to the circular bumper hole 3a formed in the bumper 3. . The retainer hole 122a has a larger diameter than the bumper hole 3a.

  Each side wall 124 has an inner width set to be substantially the same as the outer width of the casing 12 of the sensor 1, and a through-hole-shaped opening 124 a is formed at each corresponding position in the lower part of each side wall 124. ing. Each opening 124 a has a function of engaging with the engagement protrusion 12 a of the sensor 1.

  Each sticking part 131 is extended diagonally downward from the peripheral part of the side in which each side wall 123 in the bottom wall 122 was provided. On the other hand, each sticking part 132 is extended diagonally downward from the peripheral part of the side in which each side wall 124 in the bottom wall 122 was provided. Each sticking portion 131, 132 has a downward extension amount so that the lower surface is located on substantially the same plane. The retainer 120 is affixed to the bumper 3 by an adhesive member such as a double-sided adhesive tape attached to the back surfaces of the affixing portions 131 and 132.

  By the way, the center positioning member 140 and the retainer main body 121 are integrally connected with each rib 142 of the center positioning member 140 and the inner peripheral portion of the retainer hole 122a of the retainer main body 121, as shown in FIG. . That is, a core rod side connection projection 142b protruding in a triangular pyramid shape is formed at a portion of each rib 142 facing the retainer hole 122a (see FIGS. 15 and 16), while each rib 142 of the retainer hole 122a is formed on each rib 142. Retainer side connecting projections 122b having the same shape are formed at the opposing portions, and the corresponding core rod side connecting projections 142b and retainer side connecting projections 122b are connected in a point contact state.

  There are a plurality of sets of connecting portions including the core rod side connecting projection 142b and the retainer side connecting projection 122b. In the second embodiment, an example in which three sets of connecting portions are provided is shown. It should be noted that the number of sets of connecting portions including the core rod side connecting projection 142b and the retainer side connecting projection 122b is not limited to a plurality, and only one set may be provided. Each rib 142 of the center positioning member 140 functions as a core rod side connection portion of the present invention, and an inner peripheral portion of the retainer hole 122a of the retainer main body 121 functions as a retainer side connection portion of the present invention. Further, the core rod side connecting projection 142b and the retainer side connecting projection 122b function as the connecting portion of the present invention.

  Next, a method for attaching the retainer 120 to the bumper 3 will be described. First, in the insertion step, the core bar portion 141 of the center positioning member 140 is inserted into the bumper hole 3a (see FIG. 19). In this case, since the tip 142a of each rib 142 is formed in a taper shape, even when the core bar 141 is inserted into the bumper hole 3a at an angle slightly deviated from the central axis of the bumper hole 3a, the core 142 The insertion operation of the rod part 141 can be favorably continued. And all the spring parts 143 will be in the state which contacted the inner peripheral part of the bumper hole 3a, and the core bar part 141 comes to be arrange | positioned coaxially with respect to the bumper hole 3a.

  Next, in the pasting step, the pasting portions 131 and 132 of the retainer 120 are pasted on the back surface of the bumper 3 with the center positioning member 140 inserted into the bumper hole 3a (see FIG. 19). By this sticking step, the retainer 120 can be attached to the bumper 3 in a state where the retainer hole 122a is arranged coaxially with respect to the bumper hole 3a.

  Finally, in the separation step, the center positioning member 140 is pushed toward the bumper hole 3a with respect to the retainer body 121. The connecting portion composed of the core rod side connecting projection 142b and the retainer side connecting projection 122b is divided, and the center positioning member 140 and the retainer main body 121 are separated by the division, and the retainer main body as shown in FIGS. 121 becomes a state attached to the bumper 3 via each sticking part 131,132. Even if the center positioning member 140 is rotated around the central axis with respect to the retainer main body 121, the connecting portion including the core bar side connecting protrusion 142b and the retainer side connecting protrusion 122b can be divided.

  According to the second embodiment, the center positioning member 140 can be separated from the retainer body 121 by pushing the center positioning member 140 toward the bumper hole 3 a with respect to the retainer body 121. Thereby, since the position shift of the sticking position of each sticking part 131,132 can be prevented, the positional accuracy with respect to the bumper 3 of the retainer main body 121 can be ensured favorably.

  In the second embodiment, even if the center positioning member 140 is rotated around the central axis with respect to the retainer main body 121, the connecting portion including the core rod side connecting protrusion 142b and the retainer side connecting protrusion 122b is divided. Is possible. However, in this case, the attaching positions of the attaching portions 131 and 132 may be shifted around the central axis. Therefore, if the center positioning member 140 is pushed toward the bumper hole 3a side with respect to the retainer main body 121 to divide the center positioning member 140 from the retainer main body 121 as in the second embodiment, the center positioning member 140 can be separated. Since the rotational moment around the central axis does not act on the retainer main body 121 via the core rod side connecting projection 142b and the retainer side connecting projection 122b from 140, the pasting positions of the pasting portions 131 and 132 are preferably shifted around the central axis. Can be prevented.

(Modification of Example 2)
The structure in which the center positioning member 140 is pushed forward toward the bumper hole 3a with respect to the retainer main body 121 to divide the center positioning member 140 from the retainer main body 121 is not limited to the case of the second embodiment. For example, FIGS. It is good also as any structure of these.

  In each of FIGS. 23 to 25, the core rod side connection projection 142 c is integrally formed with each rib 142 of the center positioning member 140, and the core rod side connection projection 142 c is formed at the tip 142 c 1 of the retainer main body 121. The example connected integrally with the bottom face 123a1 of the retainer side connection recessed part 123a formed in the side wall 123 is shown. The connecting surface of the core rod side connection projection 142c and the retainer side connection recess 123a is positioned so as to be orthogonal to the direction in which the center positioning member 140 is pushed toward the bumper hole 3a. In each modification of the second embodiment, the rib 142 and the core rod side connection protrusion 142c function as the core rod side connection portion of the present invention, and the retainer side connection recess portion 123a functions as the retainer side connection portion of the present invention. The tip end portion 142c1 of the core rod side connection projection 142c and the bottom surface 123a1 of the retainer side connection recess portion 123a function as a connecting portion of the present invention.

  In each modification of the second embodiment, when the center positioning member 140 is pushed toward the bumper hole 3a, the tip end portion 142c1 of the core rod side connection projection 142c and the bottom surface 123a1 of the retainer side connection recess portion 123a are formed. The connecting portion can be easily divided. Thereby, it can prevent almost certainly that the sticking position of each sticking part 131 and 132 shifts | deviates around the center axis line of the center positioning member 140. FIG.

1 Sensor (Ultrasonic sensor)
2, 20, 120 Retainer (Retainer for sensor mounting)
3 Bumper 3a Bumper holes 4, 40, 140 Center positioning member 11 Sensor main body 12 Housing portion 13 Microphone (detection portion)
14 Connection terminal portions 21, 121 Retainer main body 22, 122 Bottom wall 22a Retainer holes 23, 24, 123, 124 Side walls 24a, 124a Opening (retainer side connection portion)
24b Engagement release grooves 31, 32, 131, 132 Sticking parts 41, 141 Core bar part 42 Positioning ribs 43, 143 Spring part 44 Engaging projection (core bar side connecting part)
122a Retainer hole (Retainer side connection part)
122b Retainer side connection protrusion (connection part)
123a Retainer side connection recess (Retainer side connection)
123a1 Retainer side connection recess bottom (connecting part)
142 Rib (core rod side connection)
142a Tip portion 142b Core rod side connecting projection (connecting portion)
142c Core rod side connection protrusion (core rod side connection part)
142c1 Tip of the connecting rod side connection projection (connecting portion)

Claims (9)

A sensor configured to include a cylindrical sensor body and a detection unit incorporated in the tip thereof, the detection unit being exposed to the outside of the bumper through a circular bumper hole formed in the bumper; A retainer for mounting the sensor to be attached to the inner surface of the bumper,
The retainer is a retainer body that supports the sensor so that the sensor body is disposed at a predetermined position around a central axis thereof.
The retainer main body as a base end side, extending in a direction away from the retainer main body, and a sticking portion to be attached to the bumper at a tip portion;
The retainer body is formed with a circular retainer hole corresponding to the bumper hole for inserting the sensor body from the inside of the retainer body to the bumper hole side,
A core rod portion extending coaxially with the central axis of the retainer hole, and extending in a direction away from the core rod portion with the core rod portion as a base end side, and connected to the retainer side connection portion of the retainer body The core rod portion is arranged coaxially with respect to the retainer hole, and the core rod side connection portion extends in an arc shape in plan view with the core rod portion as the base end side, and is formed on the inner peripheral portion of the bumper hole. A center positioning member including a plurality of spring portions that are elastically deformed so as to approach the core rod portion so that the core rod portion is disposed coaxially with the bumper hole in contact with the core rod portion; A sensor mounting retainer, wherein the retainer hole is attached to the bumper in a state of being coaxially disposed with respect to the bumper hole by the cooperation of the center positioning member and the retainer.   The center positioning member and the retainer are configured as separate parts in advance, and the core rod side connection portion and the retainer side connection portion can be engaged with each other and integrated in an engaged state. The retainer for mounting a sensor according to claim 1 configured as described above.   3. The sensor mounting retainer according to claim 2, wherein the core rod side connecting portion and the retainer side connecting portion are brought into an engaged state by moving the center positioning member in a central axis direction of the retainer hole.   The sensor mounting according to claim 1, wherein the center positioning member and the retainer are configured in advance as one component, and the core rod side connection portion and the retainer side connection portion are integrally connected by a connecting portion. Retainer for use.   The sensor mounting retainer according to claim 4, wherein a plurality of sets of the connecting portions are provided.   The sensor core attachment according to claim 4 or 5, wherein the core rod portion is formed in a cylindrical shape, and the core rod side connection portion is provided radially at equal angular intervals in a circumferential direction of the core rod portion. Retainer.   The sensor according to claim 6, wherein a proximal end portion of the spring portion is integrally connected to the core rod side connection portion, and the core rod side connection portion is formed as a rib that receives an input to the spring portion. Retainer for installation.   The retainer for mounting a sensor according to claim 7, wherein a tip end portion on the bumper hole side of the core rod side connection portion is formed in a tapered shape.   9. The connection portion according to claim 4, wherein the connecting portion is divided by pushing the center positioning member toward the bumper hole, and the center positioning member and the retainer are separated from each other by the division. The retainer for mounting the described sensor.

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