JP2012230002A - Ultrasonic sensor - Google Patents

Ultrasonic sensor Download PDF

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JP2012230002A
JP2012230002A JP2011098607A JP2011098607A JP2012230002A JP 2012230002 A JP2012230002 A JP 2012230002A JP 2011098607 A JP2011098607 A JP 2011098607A JP 2011098607 A JP2011098607 A JP 2011098607A JP 2012230002 A JP2012230002 A JP 2012230002A
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main body
bumper
body block
exposure hole
ultrasonic sensor
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JP5838342B2 (en
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Takashi Tsuji
崇志 辻
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Panasonic Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic sensor which can improve aesthetic appearance in a state that it is attached to a bumper.SOLUTION: An ultrasonic sensor comprises: a body block 3 which holds at least one of transmitting means for transmitting ultrasonic waves and receiving means for receiving ultrasonic waves; and a mounting base which is connected to the body block 3 and is fixed to the internal surface of a bumper 1. The body block 3 includes a cylindrical insertion part 41 which is inserted to a circular exposure hole 11 provided in the bumper 1 with its axis direction oriented to the direction of thickness of the bumper 1. The external peripheral surface of the insertion part 41 is provided with four contacting protrusions 46 having a common dimensional shape for being in contact with the internal peripheral surface of the exposure hole 11. Because the center of the insertion part 41 is more easily matched with the center of the exposure hole 11, seen from the external side of the bumper 1, than in a case that there are no contacting protrusions 46, the appearance can be improved.

Description

本発明は、超音波センサに関するものである。   The present invention relates to an ultrasonic sensor.

従来から、超音波を送信するとともに障害物で反射された超音波を受信する超音波センサが提供されている。この種の超音波センサとしては、例えば、受信された超音波におけるドップラーシフトに基づいて障害物の有無を判定するドップラーセンサなどがある。   Conventionally, an ultrasonic sensor that transmits ultrasonic waves and receives ultrasonic waves reflected by an obstacle has been provided. Examples of this type of ultrasonic sensor include a Doppler sensor that determines the presence or absence of an obstacle based on a Doppler shift in received ultrasonic waves.

上記の超音波センサとして、自動車のバンパーに設けられた露出穴に挿通される形でバンパーに固定されて用いられるものがある。上記の露出穴は自動車の前側又は後側に設けられる。これにより、例えば図７に示すような検出範囲７内の障害物が検出される。   As the above-described ultrasonic sensor, there is one used by being fixed to a bumper so as to be inserted into an exposure hole provided in a bumper of an automobile. Said exposure hole is provided in the front side or rear side of a motor vehicle. Thereby, for example, an obstacle in the detection range 7 as shown in FIG. 7 is detected.

さらに、上記の超音波センサとして、図８に示すように、バンパー１の外面側から露出穴１１に挿入される外側ブロック８１と、バンパー１の内面側から外側ブロック８１に結合する内側ブロック８２とを備え、外側ブロック８１と内側ブロック８２とが間にバンパー１を挟む形で結合することでバンパー１に対して固定されるものがある（例えば、特許文献１参照）。   Further, as the ultrasonic sensor, as shown in FIG. 8, an outer block 81 inserted into the exposure hole 11 from the outer surface side of the bumper 1, and an inner block 82 coupled to the outer block 81 from the inner surface side of the bumper 1 And the outer block 81 and the inner block 82 are fixed to the bumper 1 by being joined with the bumper 1 sandwiched therebetween (see, for example, Patent Document 1).

しかしながら、上記のように外側ブロック８１と内側ブロック８２との間にバンパー１を挟む構造では、外側ブロック８１の一部がバンパー１の外面側（図８での左側）に突出してしまうため、バンパー１に取り付けられた状態での見栄えが悪かった。   However, in the structure in which the bumper 1 is sandwiched between the outer block 81 and the inner block 82 as described above, a part of the outer block 81 protrudes to the outer surface side (left side in FIG. 8) of the bumper 1, so that the bumper The appearance when attached to 1 was poor.

そこで、本発明者は、図９（ａ）（ｂ）に示すように、それぞれバンパー１の内面に接着固定される２個の取付台２と、超音波を送受信する送受信手段を保持した本体ブロック３とを備える超音波センサを提案している。各取付台２と本体ブロック３とはそれぞれ凹凸係合により互いに着脱自在に結合する結合部２２，５３を有する。この超音波センサによれば、超音波センサの一部をバンパー１の外側に突出させる必要がないから、見栄えの改善が可能である。   Therefore, as shown in FIGS. 9 (a) and 9 (b), the present inventor has two body blocks 2 that are bonded and fixed to the inner surface of the bumper 1, and a main body block that holds transmission / reception means for transmitting and receiving ultrasonic waves. 3 is proposed. Each mounting base 2 and the main body block 3 have coupling portions 22 and 53 that are detachably coupled to each other by concavo-convex engagement. According to this ultrasonic sensor, since it is not necessary to project a part of the ultrasonic sensor to the outside of the bumper 1, the appearance can be improved.

特開２０１０−１９４４４１号公報JP 2010-194441 A

ここで、露出穴を円形状とし、本体ブロック３において露出穴に挿入される部位（以下、「挿入部」と呼ぶ。）４１を円柱形状とした場合、露出穴１１の中心と挿入部４１の中心とがずれると見栄えが悪かった。   Here, when the exposure hole has a circular shape and the portion (hereinafter referred to as “insertion portion”) 41 to be inserted into the exposure hole in the main body block 3 has a cylindrical shape, the center of the exposure hole 11 and the insertion portion 41 are formed. When it was off the center, it looked bad.

本発明は、上記事由に鑑みて為されたものであり、その目的は、バンパーに取り付けられた状態での見栄えの改善が可能な超音波センサを提供することにある。   The present invention has been made in view of the above reasons, and an object of the present invention is to provide an ultrasonic sensor capable of improving the appearance when attached to a bumper.

本発明の超音波センサは、バンパーに取り付けられる超音波センサであって、超音波を送信する送信手段と超音波を受信する受信手段との少なくとも一方を備えた本体ブロックと、前記本体ブロックに連結され前記バンパーの内面に固定される取付台とを備え、前記本体ブロックは、前記バンパーに設けられた露出穴に対し軸方向を前記バンパーの厚さ方向に向けて挿入される挿入部を有し、前記挿入部の外周面には、それぞれ共通の寸法形状であって前記露出穴の内周面に当接する複数個の接触凸部が、前記挿入部の中心軸回りにおいて前記接触凸部の存在しない角度が１８０°よりも大きくはならないような配置で突設されていることを特徴とする。   An ultrasonic sensor according to the present invention is an ultrasonic sensor attached to a bumper, and includes a main body block including at least one of a transmission unit that transmits ultrasonic waves and a reception unit that receives ultrasonic waves, and is connected to the main body block And a mounting base fixed to the inner surface of the bumper, and the main body block has an insertion portion that is inserted into an exposed hole provided in the bumper so that an axial direction is directed in a thickness direction of the bumper. The outer peripheral surface of the insertion portion has a plurality of contact convex portions that have the same size and shape and abut against the inner peripheral surface of the exposure hole, and the contact convex portions exist around the central axis of the insertion portion. It is characterized in that it is arranged in such a way that the angle that does not become larger than 180 °.

また、この超音波センサにおいて、前記接触凸部は３個以上設けられていることが望ましい。   In this ultrasonic sensor, it is desirable that three or more contact convex portions are provided.

さらに、この超音波センサにおいて、各前記接触凸部は、それぞれ、前記露出穴に挿入される方向での端に向かって、前記挿入部からの突出寸法を徐々に小さくされた傾斜部を有することが望ましい。   Further, in this ultrasonic sensor, each of the contact convex portions has an inclined portion in which the projecting dimension from the insertion portion is gradually reduced toward the end in the direction of insertion into the exposure hole. Is desirable.

また、この超音波センサにおいて、前記接触凸部において前記露出穴の内周面に接触する面が、前記露出穴の内周面よりも曲率が大きい凸曲面とされていることが望ましい。   In this ultrasonic sensor, it is preferable that a surface of the contact convex portion that contacts the inner peripheral surface of the exposure hole is a convex curved surface having a larger curvature than the inner peripheral surface of the exposure hole.

さらに、この超音波センサにおいて、前記取付台と前記本体ブロックとは、互いに連結された状態で、前記本体ブロックが、前記取付台に対し、前記挿入部の軸方向に直交する方向に変位可能な構造とされていることが望ましい。   Further, in this ultrasonic sensor, the main body block can be displaced in a direction perpendicular to the axial direction of the insertion portion with respect to the mounting base in a state where the mounting base and the main body block are connected to each other. It is desirable to have a structure.

また、この超音波センサにおいて、前記本体ブロックは、前記挿入部と前記接触凸部とを有するセンサ本体と、前記センサ本体と前記取付台とにぞれぞれ連結される連結体とからなり、前記本体ブロックと前記連結体とは、互いに連結された状態で、前記挿入部の軸方向に直交する方向において前記センサ本体に対し前記連結体が変位可能な構造とされていることが望ましい。   Further, in this ultrasonic sensor, the main body block includes a sensor main body having the insertion portion and the contact convex portion, and a coupling body connected to the sensor main body and the mounting base, respectively. It is desirable that the main body block and the connecting body are structured such that the connecting body can be displaced with respect to the sensor main body in a direction orthogonal to the axial direction of the insertion portion in a state where they are connected to each other.

さらに、この超音波センサにおいて、各前記接触凸部は、それぞれ、前記本体ブロックにおいて前記露出穴に挿入される方向の端までは延長されていないことが望ましい。   Furthermore, in the ultrasonic sensor, it is preferable that each of the contact convex portions is not extended to an end in a direction of being inserted into the exposure hole in the main body block.

本発明によれば、接触凸部が設けられない場合に比べ、バンパーの外側から見て挿入部の中心が露出穴の中心に一致しやすいことで、見栄えの改善が可能となる。   According to the present invention, it is possible to improve the appearance because the center of the insertion portion easily matches the center of the exposure hole when viewed from the outside of the bumper as compared with the case where the contact convex portion is not provided.

本発明の実施形態がバンパーに取り付けられた状態の要部を示す断面図である。It is sectional drawing which shows the principal part of the state by which embodiment of this invention was attached to the bumper. 同上がバンパーに取り付けられた状態を示す、バンパーの内面側から見た斜視図である。It is the perspective view seen from the inner surface side of the bumper which shows the state attached to the bumper. 同上を示す分解斜視図である。It is a disassembled perspective view which shows the same as the above. 同上の本体ブロックを示す斜視図である。It is a perspective view which shows a main body block same as the above. 同上がバンパーに取り付けられた状態を示す、バンパーの外面側から見た斜視図である。It is the perspective view seen from the outer surface side of the bumper which shows the state attached to the bumper. 同上のセンサ本体の要部を示す斜視図である。It is a perspective view which shows the principal part of a sensor main body same as the above. 超音波センサの使用形態の一例を示す説明図である。It is explanatory drawing which shows an example of the usage condition of an ultrasonic sensor. 従来の超音波センサがバンパーに取り付けられた状態を示す断面図である。It is sectional drawing which shows the state by which the conventional ultrasonic sensor was attached to the bumper. （ａ）（ｂ）はそれぞれ別の従来例を示す、バンパーの内面側から見た斜視図であり、（ａ）は本体ブロックが各取付台から分離された状態を示し、（ｂ）は本体ブロックが各取付台に結合した状態を示す。(A) (b) is the perspective view seen from the inner surface side of a bumper which shows another prior art example, (a) shows the state by which the main body block was isolate | separated from each mounting base, (b) is a main body The state which the block couple | bonded with each mounting base is shown.

以下、本発明を実施するための最良の形態について、図面を参照しながら説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

本実施形態は、図２に示すように、円形状の露出穴１１が貫設されたバンパー１に対して固定されるものであって、露出穴１１を挟む配置でそれぞれバンパー１の内面（図２での上面）に接着固定される２個の取付台２と、各取付台２に対しそれぞれ凹凸係合により着脱自在に結合する本体ブロック３とを備える。   As shown in FIG. 2, the present embodiment is fixed to a bumper 1 in which a circular exposure hole 11 is provided, and each inner surface of the bumper 1 (see FIG. 2, and two main bodies 3 that are detachably coupled to the respective mounting bases 2 by concavo-convex engagement.

以下、図２のＡＢＣＤＥＦの方向をそれぞれ上下左右前後と呼ぶ。つまり、バンパー１の厚さ方向のうち内面側となる方向及びバンパー１に取り付けられた状態で該方向に向けられる方向を上方と呼び、取付台２が並ぶ方向を左右方向と呼ぶ。なお、上記の方向はあくまで説明の便宜上定義するものであって、実際の使用状態での方向には必ずしも一致せず、本実施形態は通常は上記表現でいうところの下方を車両の前方又は後方へ向けて用いられる。   Hereinafter, the directions of ABCDEF in FIG. That is, of the thickness direction of the bumper 1, the direction on the inner surface side and the direction attached to the bumper 1 in this direction are referred to as “upward”, and the direction in which the mounting bases 2 are arranged is referred to as “left-right direction”. Note that the above directions are defined for convenience of explanation, and do not necessarily match the directions in the actual use state. In the present embodiment, the lower direction in the above expression is usually the front or the rear of the vehicle. Used towards.

詳しく説明すると、各取付台２はそれぞれ例えば合成樹脂からなり、各取付台２は互いに共通の寸法形状となっている。各取付台２は、それぞれ、図３に示すように、全体として厚さ方向を上下方向とし長手方向を前後方向とする長方形の平板状の固定部２１と、固定部２１の上面において前後方向の中央部から突設され厚さ方向を前後方向に向けた平板状の結合部２２とを有する。各取付台２の固定部２１の下面は、例えば周知の粘着シートを用いてバンパー１の内面に接着固定される。なお、各取付台２をバンパー１の内面に固定する方法としては、上記のような接着固定に代えて、例えば、接着剤を用いた接着固定や、溶着や、ねじ止めなどの、他の方法を用いてもよい。   More specifically, each mounting base 2 is made of, for example, a synthetic resin, and each mounting base 2 has a common dimensional shape. As shown in FIG. 3, each of the mounting bases 2 has a rectangular flat plate-like fixing portion 21 whose thickness direction is the vertical direction and the longitudinal direction is the front-rear direction, and the front-rear direction on the upper surface of the fixing portion 21. And a flat plate-like coupling portion 22 projecting from the center portion and having the thickness direction directed in the front-rear direction. The lower surface of the fixing portion 21 of each mounting base 2 is bonded and fixed to the inner surface of the bumper 1 using, for example, a well-known adhesive sheet. In addition, as a method of fixing each mounting base 2 to the inner surface of the bumper 1, instead of the above-described adhesive fixing, other methods such as adhesive fixing using an adhesive, welding, and screwing are used. May be used.

さらに、取付台２の結合部２２の厚さ方向の一方の面（図では前面）には係合凸部２２１が突設されており、この係合凸部２２１は全体として上端に向かって（つまり固定部２１から離れるほど）突出寸法が小さくなるように傾斜している。   Further, an engaging convex portion 221 is projected on one surface (front surface in the figure) of the coupling portion 22 of the mounting base 2, and the engaging convex portion 221 is directed toward the upper end as a whole ( In other words, the protrusion is inclined so that the protruding dimension becomes smaller.

本体ブロック３は、センサ本体４と、センサ本体４と取付台２との間に介在する連結体５とからなる。   The body block 3 includes a sensor body 4 and a connecting body 5 interposed between the sensor body 4 and the mount 2.

センサ本体４は、軸方向を上下方向に向けた円柱形状の挿入部４１と、挿入部４１の上端に連結された本体部４２と、本体部４２の前面に突設されたコネクタ部４３とを有する。また、センサ本体４の挿入部４１の下面には、挿入部４１と同軸であって挿入部４１よりも外径が小さい円柱形状の送受信部４５が突設されている。この送受信部４５には超音波を送信する送信手段と超音波を受信する受信手段とを兼ねた送受信手段（図示せず）が保持されており、送受信部４５の下面は、超音波が入射及び出射する入出射面となっている。具体的には例えば、センサ本体４の送受信部４５以外の部位の外面は合成樹脂からなるハウジングで構成されており、送受信部４５は、ハウジングよりも硬い材料（例えばアルミニウム）からなりハウジングに保持された別部品の一部がハウジング外に突出した部位である。また、上記の送受信手段は、超音波と電気信号との相互の変換を行うものであって、このような送受信手段は例えば圧電素子を用いて周知技術で実現することができる。本体部４２には、上記の送受信手段と上記の外部回路との間で増幅やノイズ除去などの信号処理を行う信号処理回路を構成する回路部品が収納される。コネクタ部４３は、上記の信号処理回路と外部回路との電気的接続のためのコネクタを構成する。上記の信号処理回路やコネクタは周知技術で実現可能であるので、詳細な図示並びに説明は省略する。   The sensor body 4 includes a columnar insertion portion 41 whose axial direction is directed vertically, a body portion 42 connected to the upper end of the insertion portion 41, and a connector portion 43 protruding from the front surface of the body portion 42. Have. In addition, a cylindrical transmission / reception unit 45 that is coaxial with the insertion unit 41 and has a smaller outer diameter than the insertion unit 41 protrudes from the lower surface of the insertion unit 41 of the sensor body 4. The transmission / reception unit 45 holds transmission / reception means (not shown) that serves as both transmission means for transmitting ultrasonic waves and reception means for receiving ultrasonic waves. It is an incident / exit surface that emits light. Specifically, for example, the outer surface of the sensor body 4 other than the transmission / reception unit 45 is formed of a housing made of synthetic resin, and the transmission / reception unit 45 is made of a material harder than the housing (for example, aluminum) and is held by the housing. A part of another part protrudes out of the housing. Further, the transmission / reception means described above performs mutual conversion between ultrasonic waves and electric signals, and such transmission / reception means can be realized by a known technique using, for example, a piezoelectric element. The main body 42 accommodates circuit components constituting a signal processing circuit that performs signal processing such as amplification and noise removal between the transmission / reception means and the external circuit. The connector 43 constitutes a connector for electrical connection between the signal processing circuit and an external circuit. Since the above signal processing circuit and connector can be realized by a well-known technique, detailed illustration and description thereof are omitted.

連結体５は、センサ本体４を左右から挟む形でそれぞれ凹凸係合によりセンサ本体４に連結される２個の係合部５１と、係合部５１間を連結する連結部５２とを有する。   The connecting body 5 includes two engaging portions 51 that are connected to the sensor main body 4 by concavo-convex engagement so as to sandwich the sensor main body 4 from the left and right sides, and a connecting portion 52 that connects the engaging portions 51.

ここで、センサ本体４の本体部４２の左右の側面には、それぞれ係合凸部４４が左右方向の外向きに突設されている。図４に示すように、連結体５の各係合部５１にはそれぞれ係合穴５１１が左右に貫設されており、この係合穴５１１に上記の係合凸部４４が係入することで、センサ本体４と連結体５とは互いに連結される。また、係合穴５１１の寸法形状は、上下方向と前後方向とのそれぞれについて係合凸部４４よりも大きくされおり、特に、前後方向（図４での左右方向）については上下方向よりも寸法形状の差を大きくされている。これにより、センサ本体４と連結体５とが互いに結合した状態でも、連結体５は、センサ本体４に対し、挿入部４１の軸方向（上下方向）に直交する方向である前後方向に、ある程度は変位可能となっている。   Here, on the left and right side surfaces of the main body portion 42 of the sensor main body 4, engagement convex portions 44 are provided so as to project outward in the left-right direction. As shown in FIG. 4, each engagement portion 51 of the connecting body 5 has an engagement hole 511 penetrating left and right, and the engagement protrusion 44 is engaged with the engagement hole 511. Thus, the sensor body 4 and the connecting body 5 are connected to each other. Further, the size and shape of the engagement hole 511 is larger than the engagement convex portion 44 in each of the vertical direction and the front-rear direction, and in particular, the dimension in the front-rear direction (left-right direction in FIG. 4) is larger than the vertical direction. The difference in shape has been increased. Thereby, even when the sensor main body 4 and the connecting body 5 are coupled to each other, the connecting body 5 is somewhat in the front-rear direction, which is a direction orthogonal to the axial direction (vertical direction) of the insertion portion 41 with respect to the sensor main body 4. Is displaceable.

また、各係合部５１には、それぞれ１個ずつの取付台２の結合部２２に結合する２個の結合部５３が、左右方向の外向きに突設されている。連結体５の各結合部５３は、それぞれ、厚さ方向を前後方向とした扁平な形状であって間に隙間を空けて対向する２個の挟み片５３１，５３２を有する。連結体５は例えば合成樹脂のように弾性変形可能な材料で構成されており、各結合部５３はそれぞれ挟み片５３１，５３２の下端部間の距離を大きくするように弾性変形可能となっている。また、連結体５の各結合部５３において、それぞれ、前側の挟み片５３１には、取付台２の係合凸部２２１が係入する係合穴５３３が設けられている。さらに、上記の弾性変形を発生させやすくするために、各結合部５３の上記の挟み片５３１においては係合穴５３３の周囲には適宜のスリット５３４が設けられている。   In addition, in each engaging portion 51, two connecting portions 53 that are connected to the connecting portions 22 of the respective mounting bases 2 project outwardly in the left-right direction. Each coupling portion 53 of the connecting body 5 has two sandwich pieces 531 and 532 which are flat with the thickness direction being the front-rear direction and are opposed to each other with a gap therebetween. The coupling body 5 is made of a material that can be elastically deformed, for example, a synthetic resin, and each coupling portion 53 can be elastically deformed so as to increase the distance between the lower end portions of the sandwiching pieces 531 and 532. . Further, in each coupling portion 53 of the coupling body 5, an engagement hole 533 into which the engagement convex portion 221 of the mounting base 2 is engaged is provided in the front clip piece 531. Further, in order to easily generate the elastic deformation, an appropriate slit 534 is provided around the engagement hole 533 in the sandwiching piece 531 of each coupling portion 53.

本実施形態をバンパー１に固定する際には、まず、２個の取付台２を、露出穴１１を挟む配置でバンパー１の内面に接着固定する。このとき、２個の取付台２間で結合部２２の前面同士を互いに面一とし、且つ、結合凸部２２１の中心間の距離は、係合穴５３３の中心間の距離に一致させる。   When the present embodiment is fixed to the bumper 1, first, the two mounting bases 2 are bonded and fixed to the inner surface of the bumper 1 so as to sandwich the exposure hole 11. At this time, the front surfaces of the coupling portions 22 are flush with each other between the two mounting bases 2, and the distance between the centers of the coupling convex portions 221 is matched with the distance between the centers of the engagement holes 533.

さらに、本体ブロック３の各結合部５３の挟み片５３１，５３２間に、それぞれ１個ずつの取付台２の結合部２２を導入するとともに、本体ブロック３を下方（すなわちバンパー１側）へ押し込む。すると、係合凸部２２１の傾斜面上を挟み片５３１が摺動することで各結合部５３がそれぞれ挟み片５３１，５３２の下端部間の距離を大きくするように弾性変形する。やがて、各結合部５３の係合穴５３３がそれぞれ係合凸部２２１に達すると、各結合部５３の弾性復帰とともに各係合凸部２２１がそれぞれ係合穴５３３に係入する。ここにおいて、本体ブロック３（連結体５）は、上方（すなわちバンパー１から離れる方向）への変位を係合穴５３３の内面と取付台２の係合凸部２２１との当接により制限され、本体ブロック３（連結体５）の各取付台２への連結並びに本実施形態のバンパー１への取付が完了する。また、挿入部４１の軸周りでのセンサ本体３の回転は、挟み片５３１，５３２と取付台２の結合部２２との当接により禁止される。上記の状態では、係合穴５３３を有する挟み片５３１の上端部は取付台２の結合部２２の上端よりも上側に位置する。   Further, one connecting portion 22 of the mounting base 2 is introduced between the sandwiching pieces 531 and 532 of each connecting portion 53 of the main body block 3, and the main body block 3 is pushed downward (that is, the bumper 1 side). Then, as the sandwiching piece 531 slides on the inclined surface of the engaging convex part 221, each coupling part 53 is elastically deformed to increase the distance between the lower ends of the sandwiching pieces 531 and 532, respectively. Eventually, when the engagement holes 533 of the respective coupling portions 53 reach the engagement convex portions 221, the respective engagement convex portions 221 engage with the respective engagement holes 533 as the coupling portions 53 are elastically restored. Here, in the main body block 3 (connector 5), the upward displacement (that is, the direction away from the bumper 1) is limited by the contact between the inner surface of the engagement hole 533 and the engagement convex portion 221 of the mounting base 2, The connection of the main body block 3 (connection body 5) to each mounting base 2 and the attachment to the bumper 1 of this embodiment are completed. Further, rotation of the sensor body 3 around the axis of the insertion portion 41 is prohibited by contact between the clip pieces 531 and 532 and the coupling portion 22 of the mounting base 2. In the above state, the upper end portion of the clip piece 531 having the engagement hole 533 is positioned above the upper end of the coupling portion 22 of the mounting base 2.

なお、実際には、各取付台２をそれぞれバンパー１に接着固定する作業は、各取付台２をそれぞれ連結体５に結合させる作業の後であってもよい。   Actually, the work of bonding and fixing each mounting base 2 to the bumper 1 may be after the work of connecting each mounting base 2 to the connecting body 5.

ここで、本体ブロック３が上記のように取付台２に取り付けられた状態での、取付台２の固定部２１から下方への本体ブロック３（送受信部４５）の突出寸法は、取付が想定されているバンパー１の厚さ寸法と略同じとされている。これにより、バンパー１への本実施形態の取付が完了した状態では、図５に示すように、本体ブロック３の下端面（すなわち送受信部４５の下面）はバンパー１の外面（下面）に略面一となる。   Here, in the state where the main body block 3 is attached to the mounting base 2 as described above, the projecting dimension of the main body block 3 (transmission / reception section 45) downward from the fixing portion 21 of the mounting base 2 is assumed to be attached. The thickness of the bumper 1 is substantially the same. Thereby, in a state where the mounting of the present embodiment to the bumper 1 is completed, the lower end surface of the main body block 3 (that is, the lower surface of the transmission / reception unit 45) is substantially flush with the outer surface (lower surface) of the bumper 1, as shown in FIG. Become one.

また、係合穴５３３の左右方向の寸法は、係合凸部２２１の左右方向の寸法よりも大きくされている。これにより、本体ブロック３と各取付台２とが互いに連結された状態でも、本体ブロック３（連結体５）は各取付台２に対して左右方向（挿入部４１の軸方向である上下方向に直交する方向）に変位可能となっている。   Further, the dimension of the engagement hole 533 in the left-right direction is larger than the dimension of the engagement protrusion 221 in the left-right direction. Thereby, even when the main body block 3 and each mounting base 2 are connected to each other, the main body block 3 (connecting body 5) is in the left-right direction (the vertical direction that is the axial direction of the insertion portion 41) with respect to each mounting base 2. It can be displaced in the direction perpendicular to the axis.

本体ブロック３を各取付台２から取り外す際には、係合穴５３３を有する挟み片５３１において取付台２の結合部２２よりも上側の部位を後方（すなわち他方の挟み片５３２に近づける方向）に押圧する。すると、取付台２の結合部２２との接点を支点として上記の挟み片５３１が回転するように結合部５３が弾性変形して係合穴５３３と係合凸部２２１との係合が解除されるから、そのまま本体ブロック３（連結体５）を上方（すなわち取付台２の固定部２１から離す方向）に変位させればよい。   When the main body block 3 is removed from each mounting base 2, the portion above the coupling portion 22 of the mounting base 2 in the sandwiching piece 531 having the engagement hole 533 is rearward (that is, in a direction approaching the other sandwiching piece 532). Press. Then, the coupling portion 53 is elastically deformed so that the above-described sandwiching piece 531 rotates with the contact point with the coupling portion 22 of the mount 2 as a fulcrum, and the engagement between the engagement hole 533 and the engagement convex portion 221 is released. Therefore, the main body block 3 (connector 5) may be displaced upward (that is, in a direction away from the fixing portion 21 of the mounting base 2) as it is.

以下、本実施形態の特徴部分について説明する。   Hereafter, the characteristic part of this embodiment is demonstrated.

挿入部４１の外周面には、図６に示すように、それぞれ共通の寸法形状である４個の接触凸部４６が、挿入部４１の軸周りに約９０°毎に等間隔に、挿入部４１の径方向の外向きに突設されている。各接触凸部４６はそれぞれ上下に長い形状であって、各接触凸部４６の下端（すなわち、露出穴１１への挿入部４１の挿入方向での端）はそれぞれ本体ブロック３の下端（つまり送受信部４５の下端）よりも上方に位置している。   On the outer peripheral surface of the insertion portion 41, as shown in FIG. 6, four contact convex portions 46 each having a common size and shape are arranged at regular intervals about 90 ° around the axis of the insertion portion 41. 41 is projected outward in the radial direction. Each contact convex portion 46 has a shape that is vertically long, and the lower end of each contact convex portion 46 (that is, the end in the insertion direction of the insertion portion 41 into the exposure hole 11) is the lower end of the main body block 3 (that is, transmission / reception). It is located above the lower end of the portion 45.

また、各接触凸部４６の下端部以外は、外径が露出穴１１の内径よりも小さい半円柱形状とされている。すなわち、各接触凸部４６の外周面は、露出穴１１の内周面よりも曲率が大きい凸曲面となっている。   Further, except for the lower end portion of each contact convex portion 46, the outer diameter is a semi-cylindrical shape smaller than the inner diameter of the exposure hole 11. That is, the outer peripheral surface of each contact convex portion 46 is a convex curved surface having a larger curvature than the inner peripheral surface of the exposure hole 11.

さらに、各接触凸部４６の下端部は、それぞれ上記の半円柱形状に連続した半円錐台形状であって、下端に向かって挿入部４１からの突出寸法を小さくするように傾斜した傾斜部４６１となっている。挿入部４１を露出穴１１に挿入する際には、露出穴１１の内周面に傾斜部４６１が摺接することで、挿入部４１は露出穴１１の中心に誘導される。これにより、傾斜部４６１が設けられない場合に比べ、露出穴１１への挿入部４１の挿入が容易となっている。   Furthermore, the lower end part of each contact convex part 46 is a semi-conical truncated cone shape that is continuous with the above-described semi-cylindrical shape, and an inclined part 461 that is inclined so as to reduce the protruding dimension from the insertion part 41 toward the lower end. It has become. When the insertion portion 41 is inserted into the exposure hole 11, the insertion portion 41 is guided to the center of the exposure hole 11 because the inclined portion 461 is in sliding contact with the inner peripheral surface of the exposure hole 11. Thereby, compared with the case where the inclination part 461 is not provided, insertion of the insertion part 41 to the exposure hole 11 becomes easy.

そして、図１に示すように、バンパー１への取付が完了した状態では、各接触凸部４６はそれぞれ露出穴１１の内周面に当接する。ここで、挿入部４１の外周面からの各接触凸部４６の突出寸法は、それぞれ、露出穴１１の内径と挿入部４１との外径との差に等しいことが望ましいが、発生しうる弾性変形や塑性変形の程度に応じて、上記の突出寸法は上記の差よりも大きくてもよい。   As shown in FIG. 1, in a state where the attachment to the bumper 1 is completed, each contact convex portion 46 comes into contact with the inner peripheral surface of the exposure hole 11. Here, the projecting dimension of each contact convex portion 46 from the outer peripheral surface of the insertion portion 41 is preferably equal to the difference between the inner diameter of the exposure hole 11 and the outer diameter of the insertion portion 41, but the elasticity that can occur Depending on the degree of deformation or plastic deformation, the above protrusion dimension may be larger than the above difference.

上記構成によれば、接触凸部４６が設けられない場合に比べ、バンパー１の外側から見て挿入部４１の中心が露出穴１１の中心に一致しやすいことで、見栄えの改善が可能となる。なお、各接触凸部４６の個数及び配置は上記に限られない。例えば、２個の接触凸部４６が挿入部４１の外周面において１８０°の間隔で（つまり挿入部４１の中心軸を挟んで互いに反対側に）配置された場合であっても上記の効果はあると考えられる。ただし、接触凸部４６の弾性変形や塑性変形によるがたつきを抑えるためには、接触凸部４６は、挿入部４１の中心軸回りにおいて接触凸部４６の存在しない角度が１８０°未満となるような配置で３個以上設けられることが望ましい。   According to the above configuration, the appearance can be improved because the center of the insertion portion 41 easily matches the center of the exposure hole 11 when viewed from the outside of the bumper 1 as compared with the case where the contact convex portion 46 is not provided. . In addition, the number and arrangement | positioning of each contact convex part 46 are not restricted above. For example, even when the two contact convex portions 46 are arranged at an interval of 180 ° on the outer peripheral surface of the insertion portion 41 (that is, on the opposite sides across the central axis of the insertion portion 41), the above effect is obtained. It is believed that there is. However, in order to suppress rattling due to elastic deformation or plastic deformation of the contact protrusion 46, the contact protrusion 46 has an angle where the contact protrusion 46 does not exist around the central axis of the insertion portion 41 is less than 180 °. It is desirable to provide three or more in such an arrangement.

また、本実施形態では、各接触凸部４６の下端にそれぞれ傾斜部４６１が設けられているから、各接触凸部４６が露出穴１１に導入される際に引っかかりが生じにくい。従って、傾斜部４６１が設けられない場合に比べ、露出穴１１への各接触凸部４６の導入が容易となる。   Further, in the present embodiment, since the inclined portion 461 is provided at the lower end of each contact convex portion 46, it is difficult for the catch to occur when each contact convex portion 46 is introduced into the exposure hole 11. Accordingly, it is easier to introduce each contact convex portion 46 into the exposure hole 11 than when the inclined portion 461 is not provided.

さらに、本実施形態では、接触凸部４６において露出穴１１の内周面に接触する面が、露出穴１１の内周面よりも曲率が大きい凸曲面である。従って、接触凸部４６において露出穴１１の内周面に接触する面と露出穴１１の内周面とで互いに曲率が等しくされる場合に比べ、本体ブロック３とバンパー１との接触面積が小さくなるから、誤判定の原因となるような振動がバンパー１から本体ブロック３に伝わりにくくなる。   Furthermore, in the present embodiment, the surface that contacts the inner peripheral surface of the exposure hole 11 in the contact convex portion 46 is a convex curved surface that has a larger curvature than the inner peripheral surface of the exposure hole 11. Therefore, the contact area between the main body block 3 and the bumper 1 is smaller than the case where the curvatures of the contact convex portion 46 and the inner peripheral surface of the exposure hole 11 are equal to each other. Therefore, it is difficult for vibration that causes erroneous determination to be transmitted from the bumper 1 to the main body block 3.

また、本実施形態では、各取付台２への本体ブロック３の連結が完了した状態でも、各取付台２に対して本体ブロック３（連結体５）が左右方向（すなわち挿入部４１の軸方向に直交する方向）に変位可能となっている。さらに、本実施形態では、センサ本体４への連結体５の連結が完了した状態でも、センサ本体４が連結体５に対し前後方向（すなわち挿入部４１の軸方向に直交する方向）に変位可能となっている。これにより、例えば各取付台２をそれぞれバンパー１に固定した後で本体ブロック３が取り付けられる場合に各取付台２の固定位置に誤差があっても、その誤差を、各取付台２に対する本体ブロック３の変位や、連結体５に対するセンサ本体４の変位によって吸収することができる。なお、取付台２に対して本体ブロック３を変位可能とするような連結構造や、連結体５に対してセンサ本体４を変位可能とするような連結構造は、適宜変更可能である。例えば、互いに凹凸係合する部位のうち凹部の寸法を凸部の寸法に対して大きくするといったように、設計上の余裕を適宜大きくすればよい。   Further, in this embodiment, even when the connection of the main body block 3 to each mounting base 2 is completed, the main body block 3 (connecting body 5) is in the left-right direction with respect to each mounting base 2 (that is, the axial direction of the insertion portion 41). Can be displaced in a direction orthogonal to Furthermore, in this embodiment, the sensor body 4 can be displaced in the front-rear direction (that is, the direction orthogonal to the axial direction of the insertion portion 41) with respect to the connection body 5 even when the connection of the connection body 5 to the sensor body 4 is completed. It has become. Thus, for example, when the main body block 3 is mounted after the respective mounting bases 2 are fixed to the bumpers 1, even if there is an error in the fixing position of each mounting base 2, the error is detected by the main body block with respect to each mounting base 2. 3 and the displacement of the sensor body 4 with respect to the connector 5 can be absorbed. The connecting structure that allows the main body block 3 to be displaced with respect to the mounting base 2 and the connecting structure that enables the sensor main body 4 to be displaced with respect to the connecting body 5 can be appropriately changed. For example, the design margin may be appropriately increased so that the size of the concave portion is larger than the size of the convex portion among the portions engaging with each other.

さらに、本実施形態では、各接触凸部４６の下端（すなわち、露出穴１１への挿入部４１の挿入方向での端）は、それぞれ、本体ブロック３の下端（つまり送受信部４５の下端）よりも上方に位置している。従って、各接触凸部４６がそれぞれ本体ブロック３の下端まで延長されている場合に比べ、露出穴１１への本体ブロック３（送受信部４５及び挿入部４１）の導入が容易となり、また、バンパー１の外側から見て各接触凸部４６が目立ちにくくなって見栄えが改善される。   Furthermore, in this embodiment, the lower end of each contact convex portion 46 (that is, the end in the insertion direction of the insertion portion 41 into the exposure hole 11) is respectively lower than the lower end of the main body block 3 (that is, the lower end of the transmission / reception portion 45). Is also located above. Therefore, compared with the case where each contact convex part 46 is each extended to the lower end of the main body block 3, introduction of the main body block 3 (the transmission / reception part 45 and the insertion part 41) to the exposure hole 11 becomes easy, and the bumper 1 As seen from the outside, the contact protrusions 46 are less noticeable and the appearance is improved.

なお、本体ブロック３は、上記のようにセンサ本体４と連結体５とで構成する代わりに、各結合部５３がそれぞれセンサ本体４のハウジングの一部として連続一体に形成されたような構造としてもよい。   The main body block 3 has a structure in which each coupling portion 53 is continuously formed as a part of the housing of the sensor main body 4 in place of the sensor main body 4 and the connecting body 5 as described above. Also good.

１ バンパー
２ 取付台
３ 本体ブロック
４ センサ本体
５ 連結体
１１ 露出穴
４１ 挿入部
４６ 接触凸部
４６１ 傾斜部 DESCRIPTION OF SYMBOLS 1 Bumper 2 Mounting stand 3 Main body block 4 Sensor main body 5 Connection body 11 Exposed hole 41 Insertion part 46 Contact convex part 461 Inclination part

Claims (7)

バンパーに取り付けられる超音波センサであって、
超音波を送信する送信手段と超音波を受信する受信手段との少なくとも一方を備えた本体ブロックと、
前記本体ブロックに連結され前記バンパーの内面に固定される取付台とを備え、
前記本体ブロックは、前記バンパーに設けられた露出穴に対し軸方向を前記バンパーの厚さ方向に向けて挿入される挿入部を有し、
前記挿入部の外周面には、それぞれ共通の寸法形状であって前記露出穴の内周面に当接する複数個の接触凸部が、前記挿入部の中心軸回りにおいて前記接触凸部の存在しない角度が１８０°よりも大きくはならないような配置で突設されていることを特徴とする超音波センサ。 An ultrasonic sensor attached to a bumper,
A main body block comprising at least one of a transmitting means for transmitting ultrasonic waves and a receiving means for receiving ultrasonic waves;
A mounting base connected to the main body block and fixed to the inner surface of the bumper;
The main body block has an insertion portion that is inserted with an axial direction toward a thickness direction of the bumper with respect to an exposure hole provided in the bumper,
On the outer peripheral surface of the insertion portion, there are a plurality of contact convex portions that have a common size shape and abut against the inner peripheral surface of the exposure hole, and the contact convex portions do not exist around the central axis of the insertion portion An ultrasonic sensor characterized in that the angle is set so as not to be larger than 180 °. 前記接触凸部は３個以上設けられていることを特徴とする請求項１記載の超音波センサ。   The ultrasonic sensor according to claim 1, wherein three or more contact convex portions are provided. 各前記接触凸部は、それぞれ、前記露出穴に挿入される方向での端に向かって、前記挿入部からの突出寸法を徐々に小さくされた傾斜部を有することを特徴とする請求項１又は請求項２記載の超音波センサ。   Each of the contact convex portions has an inclined portion in which a projecting dimension from the insertion portion is gradually reduced toward an end in a direction in which the contact convex portion is inserted into the exposure hole. The ultrasonic sensor according to claim 2. 前記接触凸部において前記露出穴の内周面に接触する面が、前記露出穴の内周面よりも曲率が大きい凸曲面とされていることを特徴とする請求項１〜３のいずれか１項に記載の超音波センサ。   The surface contacting the inner peripheral surface of the exposure hole in the contact convex portion is a convex curved surface having a larger curvature than the inner peripheral surface of the exposure hole. The ultrasonic sensor according to item. 前記取付台と前記本体ブロックとは、互いに連結された状態で、前記本体ブロックが、前記取付台に対し、前記挿入部の軸方向に直交する方向に変位可能な構造とされていることを特徴とする請求項１〜４のいずれか１項に記載の超音波センサ。   The mounting base and the main body block are connected to each other, and the main body block is configured to be displaceable in a direction perpendicular to the axial direction of the insertion portion with respect to the mounting base. The ultrasonic sensor according to any one of claims 1 to 4. 前記本体ブロックは、前記挿入部と前記接触凸部とを有するセンサ本体と、前記センサ本体と前記取付台とにぞれぞれ連結される連結体とからなり、
前記本体ブロックと前記連結体とは、互いに連結された状態で、前記挿入部の軸方向に直交する方向において前記センサ本体に対し前記連結体が変位可能な構造とされていることを特徴とする請求項１〜５のいずれか１項に記載の超音波センサ。 The main body block comprises a sensor main body having the insertion portion and the contact convex portion, and a connecting body connected to the sensor main body and the mounting base, respectively.
The main body block and the connecting body are structured such that the connecting body is displaceable with respect to the sensor body in a direction orthogonal to the axial direction of the insertion portion in a state of being connected to each other. The ultrasonic sensor of any one of Claims 1-5. 各前記接触凸部は、それぞれ、前記本体ブロックにおいて前記露出穴に挿入される方向の端までは延長されていないことを特徴とする請求項１〜６のいずれか１項に記載の超音波センサ。   The ultrasonic sensor according to claim 1, wherein each of the contact convex portions is not extended to an end in a direction of being inserted into the exposure hole in the main body block. .
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