JP2010155603A - Collision detector for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collision detector for a vehicle in which a pressure sensor can be attached to a chamber member made of a soft resin in a simple structure. <P>SOLUTION: The chamber member 7 made of the soft resin has a chamber space 7a formed therein, and an insert member 72 made of a material harder than that of the chamber member 7 and having at least one fixing part 72a is formed in the vicinity of an opening 71b by insertion. Accordingly, the pressure sensor 8 having a pressure detecting sensor element accommodated therein can be assuredly and simply fixed to the chamber member 7, which is made of the soft resin and to which other member is hardly directly attached, through the fixing part 72a of the insert member 72. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle collision detection device that detects a collision of a pedestrian or the like with a vehicle.

  Conventionally, regarding vehicle safety, it is required not only to ensure the safety of a vehicle occupant during an accident, but also to reduce damage to the pedestrian when the pedestrian collides with the vehicle. Therefore, when a collision of a pedestrian with a vehicle is detected and a pedestrian protection device such as an active hood or a cowl airbag is activated, an injury value (walking) that a pedestrian who collides with the vehicle and falls into the hood Have been proposed to reduce the impact received by a person.

  For example, in Japanese Patent Laid-Open No. 2006-117157 (Patent Document 1), a chamber member is disposed in front of a bumper reinforcement in a vehicle bumper in order to detect a collision, and a pressure change is detected by a pressure sensor. There has been proposed a vehicle collision detection device configured to detect a collision of a pedestrian or the like with a vehicle bumper by detection.

JP 2006-117157 A

  Here, in the vehicle collision detection apparatus using the chamber member and the pressure sensor described above, when the chamber member is formed of a soft resin, the pressure introduction pipe of the pressure sensor is inserted into the insertion hole that communicates with the chamber space of the chamber member. A configuration in which the main body of the pressure sensor is fixed to a rigid bumper reinforcement via a metal bracket is conceivable.

  However, in such a configuration, there is a problem that the mounting structure of the pressure sensor is complicated, the number of parts is increased, and the number of mounting steps is increased. In addition, since the pressure sensor is mounted across the chamber member and the bumper reinforcement, the pressure sensor is attached to the pressure sensor due to the shrinkage of the chamber member due to the difference in the linear expansion coefficient between the chamber member and the bumper reinforcement. Tension may be applied.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a vehicle collision detection device that can securely attach a pressure sensor to a soft resin chamber member with a simple structure. .

The invention according to claim 1, which has been made to solve the above-mentioned problems, includes a chamber member made of a soft resin, disposed in front of a bumper reinforcement in a vehicle bumper and having a chamber space formed therein, a pressure A pressure sensor that houses a sensor element for detection, and introduces the pressure in the chamber space into the sensor body through an opening provided in the chamber member. In the vehicle collision detection device configured to detect pressure and detect a collision with the vehicle bumper based on the pressure detection result,
The chamber member is made of a material harder than the chamber member and an insert member having at least one fixing portion is insert-molded in the vicinity of the opening,
The pressure sensor is fixed to the chamber member through the fixing portion of the insert member.

  According to this configuration, the chamber member made of a soft resin in which the chamber space is formed is made of a material harder than the chamber member and the insert member having at least one fixing portion is insert-molded in the vicinity of the opening. ing. Therefore, the pressure sensor in which the sensor element for pressure detection is housed is made of a soft resin, and the chamber member, which is difficult to directly attach other members, can be easily and easily inserted through the fixing portion of the insert member. It can be fixed securely. Moreover, since it is not necessary to fix to a bumper reinforcement via fixing members, such as a bracket, the attachment man-hour at the time of attaching a pressure sensor to a chamber member can be reduced. Further, since the pressure sensor is fixed only to the chamber member, the linear expansion coefficient of the chamber member and the bumper reinforcement is reduced as in the configuration in which the pressure sensor is mounted across the chamber member and the bumper reinforcement. Due to the difference, there is no drawback that tension is applied to the pressure sensor due to contraction of the chamber member.

According to a second aspect of the present invention, the fixing portion of the insert member is a male screw portion that protrudes to the outside of the chamber member.
The pressure sensor is fixed to the chamber member by fastening a female screw member to the male screw portion via an attachment portion of the pressure sensor.

  According to this configuration, since the fixing portion of the insert member is a male screw portion protruding to the outside of the chamber member, the pressure sensor is configured by fastening the female screw member to the male screw portion via the attachment portion. It can be simply and reliably fixed to the chamber member.

In the invention according to claim 3, the fixing portion of the insert member has a female screw portion,
The pressure sensor is fixed to the chamber member by fastening a male screw member to the female screw portion via an attachment portion of the pressure sensor.

  According to this configuration, since the fixing portion of the insert member has the female screw portion, the pressure sensor is attached to the female screw portion via the attachment portion, thereby fixing the insert member to the chamber member. Can be fixed easily and reliably.

According to a fourth aspect of the present invention, the fixing portion of the insert member protrudes to the outside of the chamber member and has a hook-shaped or umbrella-shaped locking portion at the tip.
The pressure sensor is fixed to the chamber member by locking the mounting portion of the pressure sensor with the locking portion of the fixing portion.

  According to this configuration, since the fixing portion of the insert member protrudes to the outside of the chamber member and has the hook-shaped or umbrella-shaped locking portion at the tip, the mounting portion of the pressure sensor is used as the locking portion of the fixing portion. The pressure sensor can be easily and reliably fixed to the chamber member by being locked by. In addition, since there is no need to separately attach a female screw member, a male screw member, or the like, the number of parts can be further reduced and the cost can be reduced.

  The invention according to claim 5 is characterized in that the insert member has a flange portion formed integrally with the fixed portion, and the flange portion is embedded in the chamber member.

  According to this configuration, the insert member has the flange portion formed integrally with the fixed portion, and the flange portion is embedded in the chamber member. Therefore, the flange portion is covered with the soft resin constituting the chamber member. Therefore, it is reliably integrated with the chamber member and is prevented from falling off the chamber member.

  The invention according to claim 6 is characterized in that the flange portion of the insert member has a non-circular detent shape.

  According to this configuration, since the flange portion of the insert member has a non-rotating non-circular shape, when the pressure sensor is attached to the insert member, the insert member does not idle with respect to the chamber member, so that the fixing work can be surely performed. It can be carried out.

  The invention according to claim 7 is characterized in that the insert member is integrally provided with a plurality of the fixing portions via plate-like portions.

  According to this configuration, since the plurality of fixing portions are integrally provided via the plate-like portion in the insert member, the rigidity of the pressure sensor mounting portion in the chamber member is increased, and the pressure sensor is fixed to the chamber member. In this case, deformation is less likely to occur.

  The invention according to claim 8 is characterized in that the insert member is provided with a through-hole communicating with the opening of the chamber member in the plate-like portion.

  According to this configuration, since the insert member has a through-hole communicating with the opening of the chamber member in the plate-like portion, the pressure in the chamber space can be reduced without interfering with the plate-like portion. It can be introduced into the sensor body through the opening and the through hole of the insert member.

  The invention according to claim 9 is characterized in that the insert member has a tapered cross-sectional shape of the through hole.

  According to this configuration, the soft resin enters the inside of the through hole when the chamber member is molded, and becomes a shape that fits together, so that the insert member can be prevented from falling off the chamber member.

In a tenth aspect of the present invention, a part of the chamber member is extended from the front side of the bumper reinforcement to the rear side of the vehicle and the upper side of the upper surface of the bumper reinforcement. And an extending portion provided with the opening,
The insert member is insert-molded in the vicinity of the opening of the extended portion.

  According to this configuration, a portion of the chamber member extends from the vehicle rear side of the bumper reinforcement front surface and above the bumper reinforcement upper surface to form a part of the chamber space and the opening is formed. Since the extension member is provided and the insert member is insert-molded in the vicinity of the opening of the extension portion, the pressure sensor is disposed on the upper side of the bumper reinforcement, and the pressure sensor can be easily attached to the chamber member. Thus, the number of mounting steps can be further reduced.

  The invention according to claim 11 is characterized in that the insert member is disposed in the vicinity of a parting line of a blow mold of the chamber member.

  According to this configuration, since the insert member is disposed in the vicinity of the parting line of the blow molding die, the thickness of the soft resin that surrounds and wraps around the insert member is increased, and the strength is increased. Therefore, the strength of the insert member coming off from the chamber member is improved, and the insert member can be prevented from falling off.

  The invention described in claim 12 is characterized in that the insert member is disposed on the same plane as the parting line of the chamber member.

  According to this configuration, the same surface of the chamber member as the parting line is thick because the soft resin is thick and the strength of the insert member from the chamber member can be reliably improved.

It is a whole lineblock diagram showing the collision detection device for vehicles of a first embodiment by plane view. It is principal part sectional drawing which looked at the collision detection apparatus for vehicles of a first embodiment from the side. It is sectional drawing which looked at the state which attached the pressure sensor 8 to the insert member 72 in 1st embodiment from back. It is the perspective view which looked at a mode that pressure sensor 8 is attached to insert member 72 in a first embodiment from back. It is sectional drawing which looked at the state which attached the pressure sensor 8 to the insert member 74 in 2nd embodiment from back. It is the perspective view which looked at the state which attached pressure sensor 8 to insert member 74 in the second embodiment from the slant. It is a perspective view which shows the insert member 74 in 2nd embodiment. It is a perspective view which shows the various modifications of the insert member 74 in 2nd embodiment, (a) shows a 1st modification, (b) shows a 2nd modification, (c) shows a 3rd modification, respectively. ing. It is sectional drawing which looked at the state which attached the pressure sensor 8 to the insert member 75 in 3rd embodiment from back. It is a perspective view which shows the insert member 75 in 3rd embodiment. It is a perspective view which shows the various modifications of the insert member 75 in 3rd embodiment, (a) shows a 1st modification, (b) shows a 2nd modification, (c) shows a 3rd modification, respectively. ing. It is sectional drawing which looked at the state which attached the pressure sensor 8 to the chamber member 7 via the insert member 76 in the other modification from the back. It is principal part sectional drawing which looked at the collision detection apparatus for vehicles of the modification which arrange | positioned the insert member near the parting line from the side. It is a figure explaining the shaping | molding method of the chamber member 7, Comprising: It is sectional drawing which shows the metal mold | die for chamber member 7 shaping | molding. (A) is sectional drawing which shows the insert member 72 periphery embed | buried under the chamber member 7 in a modification, (b) is sectional drawing which shows the insert member 72 periphery embed | buried in the chamber member 7 in another modification. is there.

  Hereinafter, embodiments embodying the vehicle collision detection device of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram showing a vehicle collision detection apparatus 1 according to a first embodiment of the present invention in a plan view. FIG. 2 is a cross-sectional view of the main part of the vehicle collision detection device 1 as viewed from the side. FIG. 3 is a cross-sectional view of the pressure sensor 8 attached to the insert member 72 as viewed from the rear. FIG. 4 is a perspective view of the pressure sensor 8 attached to the insert member 72 as viewed from the rear.

  As shown in FIG. 1, the vehicle collision detection device 1 is mainly configured by a chamber member 7 disposed in the vehicle bumper 2, a pressure sensor 8, and a pedestrian protection device ECU 10.

  As shown in FIGS. 1 and 2, the vehicle bumper 2 is mainly composed of a bumper cover 3, a bumper reinforcement 4, a side member 5, an absorber 6, and a chamber member 7. In FIG. 2, the bumper cover 3, the bumper reinforcement 4, the absorber 6 and the chamber member 7 are shown in cross section.

  The bumper cover 3 extends in the vehicle width direction (left-right direction) at the front end of the vehicle, and is a resin (for example, polypropylene) attached to the vehicle body so as to cover the bumper reinforcement 4, the side member 5, the absorber 6, and the chamber member 7. A cover member.

  The bumper reinforcement 4 is a metal structural member that is disposed in the bumper cover 3 and extends in the vehicle width direction, and as shown in FIG. It is a hollow member which has.

  The side members 5 are a pair of metal members that are positioned in the vicinity of the left and right side surfaces of the vehicle and extend in the vehicle front-rear direction, and the bumper reinforcement 4 described above is attached to the front end thereof.

  The absorber 6 is a foamed resin member that extends in the vehicle width direction and is attached to the lower side of the bumper reinforcement front surface 4 a in the bumper cover 3, and exhibits an impact absorbing function in the vehicle bumper 2.

  The chamber member 7 is a substantially box-shaped hollow member that is disposed above the bumper reinforcement front surface 4a in the bumper cover 3 and that extends in the vehicle width direction and is made of a soft resin such as polyethylene. A tongue-like piece 11 extending downward is provided at the rear end of the chamber member 7, and the chamber member 7 is fixed to the bumper reinforcement front surface 4 a via the tongue-like piece 11 by riveting or the like. Is done. More specifically, the chamber member 7 includes a chamber body 71 and an extending portion 71a.

  The chamber body 71 occupies most of the chamber member 7, and extends in the vehicle width direction to form a substantially sealed chamber space 7a surrounded by a wall surface of a soft resin having a thickness of several millimeters.

  The extending portion 71a is formed integrally with the chamber body 71 from a soft resin, extends from a substantially central portion in the vehicle width direction of the chamber body 71 to the upper side of the bumper reinforcement front surface 4b, and from the vehicle body front side to the vehicle body rear side. It is an extended part. The internal space of the extending portion 71a communicates with the internal space of the chamber body 71, and forms a part of the chamber space 7a. In addition, an opening 71b that connects the internal space (that is, the chamber space 7a) to the outside is provided at the upper portion of the extending portion 71a.

  Here, as shown in FIG. 3, an insert member 72 is insert-molded in the vicinity of the opening 71 b in the upper portion of the extending portion 71 a of the chamber body 71. Insert molding is one of injection molding methods, and is integrated with the chamber member 7 by placing the insert member 72 in a mold and injecting a soft resin. The insert member 72 is made of a material harder than the soft resin that is the material of the chamber member 7, for example, a metal such as iron, or a hard resin such as nylon or PBT (polybutylene terephthalate).

  As shown in FIGS. 3 and 4, the insert member 72 has an insert member main body 720, two fixing portions 72a, a flange portion 72c, and a through hole 721 communicating with the opening 71b.

  The insert member main body 720 has a plate-like overall shape, and fixed portions 72a are provided at two positions on both sides of the central through hole 721, and flange portions 72c are formed on both side surfaces. The surface of the insert member main body 720 on which the fixing portion 72a is provided is visible from the outside of the extending portion 71a. The fixing portion 72a is a male screw portion that protrudes upward for fixing the pressure sensor 8 described later, and the interval between the one fixing portion 72a and the other fixing portion 72a is an interval at which the pressure sensor 8 is attached. It is arranged so that it can be seen from the outside of the extended portion 71a. And it is provided in the side surface of the insert member main body 720, and the flange part 72c is embed | buried under the extended part 71a, and is covered with soft resin. The through-hole 721 is pierced substantially in the center of the insert member main body 720 and communicates with the opening 71b so that the pressure introduction pipe 82 of the pressure sensor 8 can be inserted.

  The pressure sensor 8 is a sensor device capable of detecting a gas pressure, and includes a sensor main body 81, a mounting portion 81a, and a pressure introduction pipe 82 as shown in FIG. The sensor body 81 is provided with a sensor element for pressure detection, outputs a voltage signal proportional to the pressure, and transmits a signal to the pedestrian protection apparatus ECU 10 via the signal line 10a. The attachment portions 81 a provided on the left and right side surfaces of the sensor body 81 are provided with attachment holes 81 b for inserting the fixing portions 72 a of the insert member 72. When the pressure sensor 8 is attached to the insert member 72, the fixing portion 72a of the insert member 72 is inserted into the attachment hole 81b, and the pressure introduction pipe 82 of the pressure sensor 8 is inserted into the opening 71b. The female screw member 72b is fastened to the fixing portion 72a of the insert member 72 protruding from 81b. In this way, the pressure sensor 8 is attached to the chamber member 7 via the insert member 72.

  The pedestrian protection device ECU10 is connected to the pressure sensor 8 and is disposed in the vehicle body. This is an electronic control device for controlling the activation of a pedestrian protection device (not shown) (for example, a known pedestrian protection airbag or hood flip-up device), and a signal output from the pressure sensor 8 is connected to the signal line 10a. It is comprised so that it may be input via. The pedestrian protection device ECU 10 executes a process for determining whether or not a pedestrian (that is, a human body) has collided with the vehicle bumper 2 based on the pressure detection result of the pressure sensor 8.

  Next, detection of a collision by the vehicle collision detection apparatus 1 of the present embodiment will be described. In the vehicle bumper 2 to which the collision detection device of this embodiment is assembled, the bumper cover 3 covers the chamber member 7 and the absorber 6 to form the outer surface of the vehicle bumper 2 as shown in FIG.

  When a pedestrian collides with the bumper of the vehicle, the pedestrian presses the vehicle bumper 2, presses the chamber member 7 through the bumper cover 3, and the pressed portion of the chamber member 7 is deformed and crushed. Due to the deformation of the chamber member 7, the gas pressure in the chamber space 7a increases. This increase in pressure is detected by the pressure sensor 8 via the pressure introduction pipe 82, and an output signal is sent to the pedestrian protection device ECU 10 via the signal line 10a and walks to the vehicle bumper 2 based on the pressure detection result. A process of determining whether or not a person (that is, a human body) has collided is executed.

  As is clear from the above detailed description, according to the present embodiment, the chamber member 7 made of a soft resin in which the chamber space 7a is formed is made of a material harder than the chamber member 7 and at least one of them. An insert member 72 having two fixing portions 72a (in this embodiment) is insert-molded in the vicinity of the opening 71b. Therefore, the fixing portion 72a of the insert member 72 is attached to the chamber member 7 in which it is difficult to directly attach another member because the pressure sensor 8 that houses the sensor element for pressure detection is made of soft resin. And can be fixed easily and reliably. Moreover, since it is not necessary to fix to the bumper reinforcement 4 via fixing members, such as a bracket, the attachment man-hour at the time of attaching the pressure sensor 8 to the chamber member 7 can be reduced. Further, since the pressure sensor 8 is fixed only to the chamber member 7, the chamber member 7 made of a soft resin is configured so that the pressure sensor 8 is mounted across the chamber member 7 and the bumper reinforcement 4. Due to the difference in linear expansion coefficient from the metal bumper reinforcement 4, there is no drawback that the pressure sensor 8 is tensioned by the contraction of the chamber member 7.

  Further, since the fixing portion 72a of the insert member 7 is a male screw portion that protrudes to the outside of the chamber member 7, the pressure sensor 8 is connected to the fixing portion 72a that is a male screw portion via the mounting hole 81b. Is fastened to the chamber member 7 easily and reliably.

  Further, the insert member 72 has a flange portion 72 c formed integrally with the fixing portion 72 a, and the flange portion 72 c is embedded in the chamber member 7, so that the flange portion 72 c constitutes the softness that constitutes the chamber member 7. Since it is covered with the resin, it is surely integrated with the chamber member 7 to prevent the chamber member 7 from falling off.

  In addition, since the insert member 72 is integrally provided with a plurality of (two in this embodiment) fixing portions 72a via the plate-like portion, the rigidity of the pressure sensor 8 mounting portion in the chamber member 7 is increased, Deformation hardly occurs when the pressure sensor 8 is fixed to the chamber member 7.

  Further, since the insert member 72 has a through-hole 721 communicating with the opening 71b of the chamber member 7 in the plate-like portion, the pressure in the chamber space 7a can be reduced without interfering with the plate-like portion. 7 and the through hole 721 of the insert member 72 can be introduced into the sensor body 81.

  Furthermore, a part of the chamber member 7 extends rearward of the vehicle from the front surface of the bumper reinforcement 4 and above the upper surface of the bumper reinforcement 4 to form a part of the chamber space 7a and an opening 71b. Since the insert member 72 is insert-molded in the vicinity of the opening 71b of the extension portion 71a, the pressure sensor 8 is disposed on the upper side of the bumper reinforcement 4, and the pressure sensor 8 is provided with the extension portion 71a. Can be easily attached to the chamber member 7, and the number of attachment steps can be further reduced.

  Next, a second embodiment will be described with reference to FIGS. FIG. 5 is a cross-sectional view of the state in which the pressure sensor 8 according to the second embodiment is attached to the insert member 74 as viewed from the rear. FIG. 6 is a perspective view of the pressure sensor 8 attached to the insert member 74 as viewed from the rear. FIG. 7 is a perspective view showing the insert member 74. In addition, the same code | symbol is attached | subjected to the structure same as embodiment mentioned above, and detailed description about them is abbreviate | omitted (the same also in the following embodiment and modification).

  In the first embodiment, the two fixing portions 72a are integrated in the insert member 72 via the plate-like portion. However, in the present embodiment, as shown in FIG. The insert member 74 having the insert member 74 is insert-molded at two locations on both sides of the opening 71b of the extending portion 71a.

  Specifically, the insert member 74 includes an insert member main body 740, a fixing portion 74a, and a flange portion 74c. The insert member main body 740 has a columnar shape, a fixed portion 74a is provided on the upper surface, and a flange portion 74c is provided on the side surface. As shown in FIG. 6, the fixing portion 74 a having a male screw portion can be seen from the outside of the extending portion 71 a, and the interval between the one fixing portion 74 a and the other fixing portion 74 a is an interval at which the pressure sensor 8 is attached. Arranged. The flange portion 74c is disposed inside the extended portion 71a so as to be covered with resin.

  Further, as shown in FIG. 7, the flange portion 74c of the insert member 74 has a non-circular detent shape in which a plurality of acute-angled protrusions are provided on the outer periphery.

  When the pressure sensor 8 is attached to the insert member 74, the fixing portion 74a of the insert member 74 is inserted into the attachment hole 81b of the pressure sensor 8, and the pressure introduction pipe 82 of the pressure sensor 8 is inserted into the opening 71b. The fixing portion 74a of the insert member 74 protruding from the mounting hole 81b of the sensor 8 is fastened by the female screw member 72b.

  As is clear from the above detailed description, according to the present embodiment, since the fixing portion 74a of the insert member 74 is a male screw portion protruding to the outside of the chamber member 7, the pressure sensor 8 is provided with the mounting hole 81b. By fastening the female screw member 72b to the fixing portion 74a, which is a male screw portion, the chamber member 7 can be easily and reliably fixed.

  Further, the insert member 74 has a flange portion 74 c formed integrally with the fixing portion 74 a, and the flange portion 74 c is embedded in the chamber member 7, so that the flange portion 74 c constitutes the softness that constitutes the chamber member 7. Since it is covered with the resin, it is surely integrated with the chamber member 7 to prevent the chamber member 7 from falling off.

  In particular, since the flange portion 74c of the insert member 74 has a non-circular non-rotating shape, when the pressure sensor 8 is attached to the insert member 7, the insert member 74 does not rotate freely with respect to the chamber member 7 and is securely fixed. Work (fastening of the female screw member 72b) can be performed.

  Note that the insert member 74 may be configured to be attached to the pressure sensor 8 by providing only one place in the extended portion 71a.

  Next, each modification of the second embodiment described above will be described. FIG. 8 is a perspective view showing various modifications of the insert member 74, where (a) shows a first modification, (b) shows a second modification, and (c) shows a third modification. Yes.

  As shown in FIG. 8A, the insert member 74 of the first modification has a triangular flange portion 74c. Further, the insert member 74 of the second modified example has a quadrangular flange portion 74c as shown in FIG. 8B. Further, the insert member 74 of the third modified example has a gear-shaped flange portion 74c as shown in FIG. 8C.

  Also in the first to third modifications, the flange portion 74c of the insert member 74 has a non-circular detent shape, and therefore, when the pressure sensor 8 is attached to the insert member 74, as in the second embodiment. The insert member 74 does not idle with respect to the chamber member 7, and the fixing operation (fastening of the female screw member 72b) can be performed reliably.

  Next, a third embodiment will be described with reference to FIGS. FIG. 9 is a cross-sectional view of the state in which the pressure sensor 8 is attached to the insert member 75 in the third embodiment as seen from the rear. FIG. 10 is a perspective view showing the insert member 75.

  In the second embodiment, the fixing portion 74a of the insert member 74 is constituted by a male screw portion. However, in this embodiment, as shown in FIG. 9, the fixing portion 75a of the insert member 75 is constituted by a female screw portion. It is characterized by being.

  Specifically, the insert member 75 includes an insert member main body 750, a fixing portion 75a, and a flange portion 75c, and is insert-molded at two locations on both sides of the opening portion 71b of the extending portion 71a. The insert member main body 750 has a cylindrical overall shape, a fixing portion 75a that is a female screw portion is provided in the main body, and a flange portion 75c is provided on a side surface. The female screw hole of the fixing portion 75a of the insert member 75 is visible from the outside of the extending portion 71a, and the interval between the one fixing portion 75a and the other fixing portion 75a is arranged at an interval at which the pressure sensor 8 is attached. ing.

  As shown in FIG. 10, the flange portion 75c of the insert member 75 has a non-circular detent shape in which a plurality of acute-angled protrusions are provided on the outer periphery.

  When the pressure sensor 8 is attached to the insert member 75, the attachment hole 81b of the attachment part 81a of the pressure sensor 8 is aligned with the female screw hole of the fixing part 75a, and the male screw member 75d is inserted into the attachment hole 81b. Fasten to the female screw hole 75a.

  As is clear from the above detailed description, according to the present embodiment, since the fixing portion 75a of the insert member 75 has the female screw portion, the pressure sensor 8 is connected to the female screw via the mounting portion 81a. By fastening the male screw member 75d to the fixing portion 75a, which is a portion, the chamber member 7 can be easily and reliably fixed.

  Further, the insert member 75 has a flange portion 75 c formed integrally with the fixing portion 75 a, and the flange portion 75 c is embedded in the chamber member 7, so that the flange portion 75 c constitutes the softness that constitutes the chamber member 7. Since it is covered with the resin, it is surely integrated with the chamber member 7 to prevent the chamber member 7 from falling off.

  Particularly, since the flange portion 75c of the insert member 75 has a non-circular non-rotating shape, the insert member 75 does not rotate freely with respect to the chamber member 7 when the pressure sensor 8 is attached to the chamber member 7, and is securely fixed. The work (fastening the male screw member 75d) can be performed.

  Next, each modification of the third embodiment described above will be described. FIG. 11 is a perspective view showing various modifications of the insert member 75, where (a) shows a first modification, (b) shows a second modification, and (c) shows a third modification. Yes.

  As shown in FIG. 11A, the insert member 75 of the first modification has a triangular flange portion 75c. Further, the insert member 75 of the second modified example has a quadrangular flange portion 75c as shown in FIG. Moreover, the insert member 75 of the third modification has a gear-shaped flange portion 75c as shown in FIG.

  Also in the first to third modifications, the flange portion 75c of the insert member 75 has a non-circular non-rotating shape, and therefore when the pressure sensor 8 is attached to the chamber member 7 as in the third embodiment. The insert member 75 does not idle with respect to the chamber member 7, and the fixing operation (fastening of the male screw member 75d) can be performed reliably.

  The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

  For example, in the first and second embodiments, the fixing portions 72a and 74a of the insert members 72 and 74 may protrude to the outside of the chamber member 7 and have a hook-shaped or umbrella-shaped locking portion at the tip. . FIG. 12 is a cross-sectional view of the state in which the pressure sensor 8 is attached to the chamber member 7 via the insert member 76 in another modification as viewed from the rear. In the present modification, a hook-like locking portion 76 a is provided at the tip of the insert member 76. The fixing portion 76a of the insert member 76 is inserted into the mounting hole 81b of the mounting portion 81a of the pressure sensor 8, and the pressure sensor 8 comes off by engaging the mounting hole 81b with the flange portion protruding from the mounting hole 81b of the pressure sensor 8. Disappear. By making the upper portion of the fixing portion 76 a into a bowl shape, the pressure sensor 8 can be prevented from falling off and fixed to the chamber member 7.

  That is, according to this modification, the pressure sensor 8 can be easily and reliably fixed to the chamber member 7 by locking the mounting portion 81a of the pressure sensor 8 by the fixing portion 76a that is a locking portion. In addition, since there is no need to separately attach a female screw member, a male screw member, or the like, the number of parts can be further reduced and the cost can be reduced.

  In the present modification, the fixing portion 76a may be configured with rivets. That is, by inserting the distal end of the fixed portion 72a or the fixed portion 74a into the mounting hole 81b of the pressure sensor 8, and crushing the distal end portion of the fixed portion 72a or the fixed portion 74a protruding from the mounting hole 81b to deform it into an umbrella shape. The attachment hole 81 b is locked by the tip portion, and the pressure sensor 8 can be attached to the chamber member 7 via the insert members 72 and 74.

  Moreover, in the said embodiment, although it was set as the structure which arrange | positions only one extended part 71a of the chamber member 7 in the center of a vehicle width direction, while providing multiple extended parts 71a, multiple pressure sensors 8 are arrange | positioned. It may be possible (for example, two locations in the vehicle width direction of the chamber member). By disposing a plurality of pressure sensors 8, the pedestrian protection apparatus ECU 10 can comprehensively determine information from the plurality of pressure sensors, so that malfunction can be prevented. In this case, since the position where the pressure sensor 8 is disposed in the chamber member 7 is separated from the center in the vehicle width direction, the pressure sensor 8 may move slightly in the vehicle width direction due to the contraction of the chamber member 7. Since the pressure sensor 8 is fixed only to the chamber member 7, the chamber member 7 made of a soft resin and the metal are mounted like the configuration in which the pressure sensor 8 is mounted across the chamber member 7 and the bumper reinforcement 4. Due to the difference in coefficient of linear expansion from the bumper reinforcement 4 made of the material, there is no drawback that the pressure sensor 8 is tensioned by the contraction of the chamber member 7.

  Moreover, in each said embodiment, insert member (72, 74, 75, 76) may be arrange | positioned in the parting line vicinity of the blow molding die of the chamber member 7. FIG. The parting line is a parting line between molds, and it is known that the thickness of the resin to be blow-molded becomes thicker as it gets closer to the parting line and becomes thinner as it gets farther away. Here, FIG. 13 is a cross-sectional view of the principal part of a vehicle collision detection device according to a modification in which an insert member is disposed in the vicinity of the parting line, as viewed from the side. FIG. 14 is a view for explaining a method of forming the chamber member 7 and is a cross-sectional view showing a mold for forming the chamber member 7. FIG. 15A is a cross-sectional view showing the periphery of the insert member 72 embedded in the chamber member 7 in the modified example, and FIG. 15B is a cross-sectional view showing the periphery of the insert member 72 embedded in the chamber member 7 in another modified example. FIG.

  In this modification, as shown in FIG. 13, the insert member 72 is disposed in the vicinity of the blow molding die parting line PL <b> 1 of the chamber member 7. More specifically, the insert member 72 is disposed on the upper wall 714 of the upper surface of the extending portion 71a that is flush with the parting line PL1.

  Here, a method of forming the chamber member 7 will be described with reference to FIG. The chamber member 7 is formed by blow molding using a plurality of molding dies. That is, the chamber member 7 is formed using three types of molds. As shown in FIG. 14, the mold includes a front mold A that forms a side wall on the front side of the vehicle, an upper mold B that forms a part of the upper wall of the extending portion 71a near the insert member, and a rear side of the vehicle. It is constituted by a rear mold C that forms a side wall on the side.

  The front mold A is disposed on the front surface of the rear mold C, and extends from the front wall 711, the upper wall 712, the lower wall 713, the left and right walls (not shown) of the chamber body 71 and the vicinity of the center of the chamber body 71. A part of the upper wall 714 of the installation part 71a up to the front of the insert member 72 and left and right walls (not shown) of the extension part 71a are formed. The upper mold B is sandwiched between the front mold A and the rear mold C and is disposed on the upper surface of the insert member 72 of the extended portion 71a. The upper mold B includes the insert member 72 of the extended portion 71a, and the extended portion 71a. The remaining part of the upper wall 714 to the rear wall is formed. Since the upper mold B covers the upper surface side of the insert member 72, the soft resin is not wrapped, so that the upper surface side of the insert member 72 can be seen from the outside after blow molding. The rear mold C is disposed on the rear surface of the front mold A so as to sandwich the above-described upper mold B with the front mold A, and extends from the rear wall 715 of the chamber body 71 and the chamber body 71. A lower wall 716 and a rear wall 717 are formed in the portion 71a.

  In this modification, two parting lines PL1 and PL2 are formed as dividing lines by the front mold A, the upper mold B, and the rear mold C. That is, the parting line PL1 is located at a boundary portion between the upper wall 714 and the rear wall 717 of the extending portion 71a of the chamber member 7 and extends in the vehicle width direction. The parting line PL2 is located at a boundary portion between the lower wall 713 and the rear wall 715 of the chamber main body 71 of the chamber member 7 and extends in the vehicle width direction.

  And in order to shape | mold the chamber member 7, the insert member 72 is arrange | positioned in the parting line PL1 vicinity of the upper wall 714 of the extension part 71a which is the same surface as the parting line PL1, and each die mentioned above is match | combined. Next, after blow molding, the front mold A is moved forward, the upper mold B is moved upward, and the rear mold C is moved rearward. As a result, the chamber member 7 is completed.

  Next, the flange portion 72c of the insert member 72 will be described. As shown in FIG. 15A, the insert member 72 is a rear side of the extending portion 71a with respect to the vehicle front-rear direction, in the vicinity of the parting line PL1 of the chamber member 7, and including the parting line PL1. It is arrange | positioned on the upper surface of the installation part 71a. As for the insert member 72, the flange part 72c is embed | buried under the soft resin of the upper wall 714 of the upper surface of the extension part 71a of the chamber member 7. FIG. Then, the thickness of the soft resin of the chamber member 7 that wraps around the flange portion 72c on the vehicle rear side of the insert member 72 is formed thick (arrow W1), and the flange portion becomes closer to the vehicle front side away from the parting line PL1. The wall thickness surrounding and wrapping 72c is reduced (arrow D).

  15B, the thickness of the soft resin of the chamber member 7 that wraps the flange 72c on the vehicle rear side of the insert member 72 is set to the vertical height of the embedded portion of the insert member 72. As shown in FIG. It may be formed as described above so that the space between the flange portion 72c on the vehicle rear side and the rear wall 717 is completely filled with a soft resin (arrow W1).

  As described above, since the insert member 72 is disposed in the vicinity of the parting line PL1, the thickness of the soft resin of the chamber member 7 that is wrapped around and wrapped around the flange portion 72c is increased. Is increased, the strength of the insert member 72 coming out from the extended portion 71a is increased, and can be prevented from falling off. Further, the insert member 72 is disposed on the upper wall 714 of the upper surface of the extending portion 71a that is flush with the parting line PL1, so that the upper wall 714 of the upper surface of the extending portion 71a becomes the parting line PL1. Since the strength of the soft resin increases in the vicinity, it is possible to increase the pull-out strength of the insert member 72 from the chamber member 7.

  Further, in the insert member 72, the cross-sectional shape of the through hole 721 may be a tapered shape. The cross-sectional shape of the through hole 721 is such that the upper surface hole of the through hole 721 on the upper surface side (outside the chamber space 7a) visible from the outside of the insert member 72 has a large diameter, and the lower surface side of the insert member 72 (the extension after blow molding). The taper shape gradually decreases in diameter toward the lower surface hole of the through hole 721 (inside the chamber space 7a of the installation portion 71a). Therefore, in the insert member 72, the soft resin enters the through hole 721 and engages via the tapered surface at the time of blow molding, so that the insert member 72 can be more reliably prevented from falling off from the extending portion 71a.

1: Vehicle collision detection device 2: Vehicle bumper 3: Bumper cover 4: Bumper reinforcement 4a: Bumper reinforcement front 4b: Bumper reinforcement top 5: Side member 6: Absorber 7: Chamber member 7a: Chamber space 71: Chamber main body 71a: Extension part 71b: Opening part 72, 74, 75, 76: Insert member 720, 740, 750, 760: Insert member main body 72a, 74a, 75a, 76a: Fixing part 72c, 74c, 75c, 76c: Flange portion 721: Through hole 72b: Female screw member 75d: Male screw member
8: Pressure sensor 81: Sensor body 81a: Mounting portion 81b: Mounting port 82: Pressure introducing pipe 10: Pedestrian protection device ECU 10a: Signal line 11: Tongue piece PL: Parting line a: Front mold b: Upper Mold c: Back mold 711: Front wall 712, 714: Upper wall 713, 716: Lower wall 715, 717: Rear wall

Claims (12)

A soft resin chamber member disposed in front of the bumper reinforcement in the vehicle bumper and having a chamber space formed therein; and a pressure sensor configured to house a sensor element for pressure detection. The pressure in the chamber space is introduced into the sensor body through an opening provided in the chamber member, pressure is detected by the sensor element, and collision with the vehicle bumper is performed based on the pressure detection result. In the vehicle collision detection device configured to detect
The chamber member is made of a material harder than the chamber member and an insert member having at least one fixing portion is insert-molded in the vicinity of the opening,
The vehicle collision detection device, wherein the pressure sensor is fixed to the chamber member via the fixing portion of the insert member. The fixing portion of the insert member is a male screw portion protruding to the outside of the chamber member,
The vehicle collision detection device according to claim 1, wherein the pressure sensor is fixed to the chamber member by fastening a female screw member to the male screw portion via an attachment portion of the pressure sensor. . The fixing portion of the insert member has a female screw portion,
The vehicle collision detection device according to claim 1, wherein the pressure sensor is fixed to the chamber member by fastening a male screw member to the female screw portion via an attachment portion of the pressure sensor. . The fixing portion of the insert member protrudes to the outside of the chamber member and has a hook-shaped or umbrella-shaped locking portion at the tip,
The vehicle collision detection device according to claim 1, wherein the pressure sensor is fixed to the chamber member by locking the mounting portion of the pressure sensor with the locking portion of the fixing portion.   The said insert member has a flange part integrally formed with the said fixing | fixed part, The said flange part was embed | buried under the said chamber member, The Claim 1 characterized by the above-mentioned. Vehicle collision detection device.   The vehicle collision detection device according to claim 5, wherein the flange portion of the insert member has a non-circular detent shape.   The vehicular collision detection device according to any one of claims 1 to 6, wherein the insert member includes a plurality of the fixing portions integrally provided via a plate-like portion.   8. The vehicular collision detection apparatus according to claim 7, wherein the insert member is provided with a through-hole communicating with the opening of the chamber member in the plate-like portion.   The vehicular collision detection device according to claim 8, wherein the insert member has a tapered cross-sectional shape of the through hole. A part of the chamber member extends rearward from the front surface of the bumper reinforcement and above the upper surface of the bumper reinforcement to form a part of the chamber space, and the opening is provided. Provided with an extended portion,
The vehicular collision detection device according to claim 1, wherein the insert member is insert-molded in the vicinity of the opening of the extended portion.   11. The vehicle collision detection device according to claim 1, wherein the insert member is disposed in the vicinity of a parting line of a blow molding die of the chamber member.   The vehicle collision detection device according to claim 11, wherein the insert member is disposed on the same surface as the parting line of the chamber member.

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