JP5170551B2 - Vehicle collision detection device - Google Patents

Description

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

  In recent years, for the purpose of protecting pedestrians, in order to protect pedestrians, if an obstacle discriminating device is attached to the vehicle bumper part, it is determined whether or not the collision target is a pedestrian at the time of a vehicle collision. Techniques for operating these devices (for example, active hoods and cowl airbags) have been proposed, and their practical application has been studied.

  That is, when the obstacle which collided is not a pedestrian, various bad influences will arise if the protective device (for example, active hood) on a hood is operated. For example, if it cannot be distinguished from a pedestrian when it collides with a lightweight fallen object such as a triangular cone or a signboard under construction, the protection device is activated wastefully and extra repair costs are generated. In addition, if it is indistinguishable from a pedestrian when it collides with a fixed object such as a concrete wall or a vehicle, the hood will move backward with the hood lifted up. is there. Thus, it is required to accurately classify whether or not the obstacle is a pedestrian.

Therefore, as described in, for example, Japanese Patent Application Laid-Open No. 2006-117157 (Patent Document 1), a chamber member is disposed in front of the bumper reinforcement in the vehicle bumper, and a pressure sensor detects the pressure change in the chamber space. There has been proposed a vehicle collision detection device configured to detect a collision of a pedestrian or the like with a vehicle bumper.
JP 2006-117157 A

  By the way, in order to detect the pressure in the chamber space with the pressure sensor, it is necessary to insert the pressure introduction pipe of the pressure sensor into the chamber member. Accordingly, the chamber member is formed with an insertion port into which the pressure introducing pipe is inserted.

  The inner diameter of this insertion port is slightly larger than the outer diameter of the pressure introducing pipe. That is, the chamber space is made non-sealed by providing a slight gap (tolerance). Since this gap acts as a breathing hole, the atmospheric pressure in the chamber space 7a is kept the same as the outside air (atmospheric pressure) in a normal state where no collision occurs.

  Here, when the chamber member is a non-sealed type, there is a possibility that rainwater, snow, dust, or the like (hereinafter abbreviated as rainwater) enters the gap (breathing hole) of the insertion port and closes the gap. is there. When this gap is closed, the amount of air leakage at the time of collision changes from the design time, and there is a problem that the detection accuracy of the pressure change is lowered. In addition, rainwater or the like may enter the chamber member, which may adversely affect pressure detection.

  The present invention has been made in view of such circumstances, and prevents intrusion of rainwater or the like into an inlet for a pressure introduction pipe provided in a chamber member, and can maintain high pressure detection accuracy. An object of the present invention is to provide a vehicle collision detection device.

  A vehicle collision detection device according to the present invention includes a sensor main body provided with a sensor element for pressure detection, a pressure sensor having a pressure introduction pipe for introducing pressure into the sensor main body, and a front surface of a bumper reinforcement in the vehicle bumper. And a chamber member in which a chamber space is formed and an insertion port into which the pressure introduction tube can be inserted is opened, and the pressure introduction tube of the pressure sensor is inserted into the insertion port of the chamber member. In the vehicle collision detection device configured to detect a pressure in the chamber space and detect a collision with the vehicle bumper based on the pressure detection result, a barrier member is provided at least on the vehicle front side of the insertion port. It is characterized by that.

  As a result, while the vehicle is traveling forward, the barrier member can prevent the progress of rainwater or the like approaching the insertion port from the front of the vehicle, in front of the insertion port (vehicle front side). Accordingly, it is possible to prevent rainwater or the like from approaching the insertion port, and as a result, rainwater or the like enters the gap between the insertion port and the pressure introduction pipe (hereinafter also referred to as the “gap of the insertion port”). Can be prevented. And since the clearance gap of an insertion port is not block | closed, a high pressure detection precision can be maintained.

  Here, the present invention is more effective when using a chamber member having an insertion port opened upward. In other words, it is a structure in which rainwater or the like easily enters the gap of the insertion port due to the influence of gravity, but according to the present invention, it is possible to prevent access to the insertion port of rainwater or the like on the front side of the vehicle. Rain water and the like can be prevented from entering.

  Here, the barrier member may be further provided on the vehicle side of the insertion port. Thereby, the left-right direction of an insertion port is also protected from rainwater etc., and infiltration of rainwater etc. can be prevented more reliably.

  Moreover, the barrier member may have a cover part which covers the upper part of an insertion port. Thereby, the upper part of an insertion port is also protected from rainwater etc., and infiltration of rainwater etc. can be prevented more reliably. And it is preferable that the cover part is arrange | positioned above the insertion port and the downward direction of a sensor main body. By making the cover portion approach the insertion port, it is possible to more firmly prevent rainwater and the like from entering.

  By the way, in the present invention, the barrier member described above is preferably formed integrally with the chamber member. That is, the barrier member is formed as a part of the chamber member. This can prevent an increase in the number of parts.

On the other hand, when the sensor main body of the pressure sensor arranged above the insertion port is fixed by a bracket, a barrier member may be integrally formed on the bracket. That is, in the present invention, the chamber member has an extending portion that extends partly behind the bumper reinforcement front surface and above the bumper reinforcement front surface and forms a part of the chamber space. In addition, the insertion port is opened in the extension part, and the sensor body of the pressure sensor is fixed to the upper surface side of the bumper reinforcement via a bracket formed in a bridge shape straddling the extension part. The barrier member may be formed integrally with the bracket.

  Thereby, at least the vehicle front of the insertion port is protected by the barrier member. Furthermore, since the bracket has a bridge shape, the bracket itself exhibits a barrier function in protecting the right and left sides and above the insertion port. That is, according to this configuration, it is possible to more reliably prevent intrusion of rainwater or the like.

  Further, by forming the barrier member integrally with the bracket, an increase in the number of parts can be prevented. The bracket is generally formed of metal. In general, metal molding is higher in material cost and processing cost than resin molding. Therefore, in terms of cost, the barrier member is better formed integrally with the chamber member by resin.

  Furthermore, the barrier member may be formed on the sensor body side.

  According to such a configuration, it is possible to prevent intrusion of moisture and the like from the insertion port into the chamber with a simpler configuration than when the barrier member is formed integrally with the chamber member and the bracket.

  In the above, it is preferable that the chamber member has a convex portion that protrudes upward from the upper surface of the extending portion, and the insertion port is provided in the convex portion. Thereby, the position of an insertion port raises. Therefore, even when rainwater or the like gets over the barrier member, the entry of rainwater or the like into the insertion port is prevented by the presence of the insertion port above the chamber extension portion.

  In particular, when the barrier member is integrally formed on the bracket, the barrier member may be provided downward from the upper surface of the bracket. In this case, a gap may be formed between the barrier member and the upper surface of the extending portion. However, according to this configuration, even if rainwater or the like enters between the barrier member and the upper surface of the extended portion, the position of the insertion port rises from the upper surface of the extended portion due to the convex portion. Intrusion into the outlet is prevented.

In the configuration in which the barrier member is formed on the sensor body side, the barrier member may be provided so as to extend upward from the extending portion so that at least a portion thereof overlaps the convex portion in the vertical direction.

  According to such a configuration, the barrier member becomes a double barrier so to speak as a convex portion, and it is possible to effectively prevent intrusion of rainwater or the like.

  According to the vehicle collision detection device of the present invention, it is possible to prevent rainwater or the like from entering the insertion port for the pressure introduction pipe provided in the chamber member, and to maintain high pressure detection accuracy.

  Hereinafter, an embodiment in which a vehicle collision detection device of the present invention is embodied will be described in detail with reference to the drawings.

<First embodiment>
A first embodiment will be described with reference to FIGS. FIG. 1 is a plan view schematically showing a vehicle collision detection apparatus 1 of the first embodiment, and FIG. 2 is a side view thereof. FIG. 3 is a view showing the chamber member 7 from the front side of the vehicle. FIG. 4 is a view showing the extended portion 72 from above. FIG. 5 is a schematic perspective view of the bracket 9. FIG. 6 is a view showing the attachment state of the pressure sensor 8 from the front side of the vehicle.

  As shown in FIG. 1, the vehicle collision detection device 1 includes a chamber member 7 disposed in a vehicle bumper 2, a pressure sensor 8, a pedestrian protection device electronic control unit (hereinafter referred to as an electronic control unit as an ECU). (Abbreviated) 10 as a main component.

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

  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 front surface 4 a of the bumper reinforcement 4 within the bumper cover 3, and exhibits an impact absorbing action in the vehicle bumper 2.

  The chamber member 7 is a substantially box-shaped synthetic resin member that extends in the vehicle width direction and is attached to the upper side of the bumper reinforcement front surface 4a in the bumper cover 3, and is surrounded by a wall having a thickness of several millimeters. A substantially sealed chamber space 7a is formed.

  More specifically, the chamber member 7 includes a main body portion 71 and an extending portion 72. The main body 71 is a portion disposed in front of the bumper reinforcement front surface 4a, and extends in the vehicle width direction. The extending portion 72 is a portion extending from the central portion in the vehicle width direction on the upper surface of the main body portion 71 toward the rear and upper sides of the vehicle. In other words, the extending portion 72 is a portion in which a part of the chamber member 7 in the vehicle width direction extends to the vehicle rear side and the bumper reinforcement upper surface 4b from the bumper reinforcement front surface 4a. The internal space of the extending portion 72 communicates with the internal space of the main body portion 71 and forms a part of the chamber space 7a. As shown in FIG. 1, the extending portion 72 is provided at a central portion between the side members 5 and 5 in the vehicle width direction.

  A convex portion 73 protruding in a columnar shape upward from the upper surface is formed at a rear portion of the extending portion 72. The convex portion 73 has a hollow shape having a protruding end surface 73 a and a side surface 73 b, and the inside communicates with the inside of the extending portion 72. The protruding end surface 73a is an end surface in the protruding direction (upward) of the convex portion 73 and has a circular shape. The side surface 73b has a cylindrical shape and protrudes substantially vertically from the upper surface of the extending portion 72.

  An insertion port 73c is provided at the center of the protruding end surface 73a. The insertion port 73c is circular and opens upward. As for the approximate dimensions of the convex portion 73 in this embodiment, the protruding height is about 10 mm, the diameter of the protruding end surface 73a is about 15 mm, and the diameter of the insertion port 73c is about 5 mm. The insertion port 73c is located above the bumper reinforcement upper surface 4b.

  Here, as shown in FIGS. 2 to 4, on the upper surface of the extending portion 72, a barrier portion 74 (corresponding to a “barrier member” in the present invention) protruding upward is formed in a flat plate shape. Yes. The barrier part 74 is located on the vehicle front side of the insertion port 73c. In this embodiment, the barrier part 74 is located in the vehicle front side rather than the vehicle front end part of the bracket 9 mentioned later. The height of the barrier portion 74 from the upper surface of the extended portion 72 is higher than that of the convex portion 73 and is higher than the height at which the fixing portion 95 of the bracket 9 described later is located.

  Further, the width in the left-right direction of the barrier portion 74 is larger than the diameter of the convex portion 73, and the convex portion 73 is completely hidden by the barrier portion 74 as shown in FIG. The barrier portion 74 is formed integrally with the extending portion 72. In the present embodiment, the thickness of the barrier portion 74 is substantially equal to the thickness of the wall surface of the chamber member 7. It is possible to increase the thickness of the barrier part 74.

  The special-shaped chamber member 7 having the extending portion 72, the convex portion 73, and the barrier portion 74 is formed by blow molding. The chamber member 7 of the present embodiment can be more easily manufactured by blow molding using, for example, LDPE (low density polyethylene) as a raw material. And after blow molding, in order to form the insertion port 73c in the protrusion end surface 73a of the convex-shaped part 73, the drilling process using a drill etc. is performed.

  The pressure sensor 8 is a sensor device capable of detecting a gas pressure, and is configured to be attached to the chamber member 7 so as to detect a pressure change in the chamber space 7a. Specifically, the pressure sensor 8 includes a sensor main body 81 and a pressure introduction pipe 82. The sensor main body 81 is a part that is outside the chamber member 7 and accommodates a substrate or the like provided with a sensor element for pressure detection. The sensor body 81 outputs a voltage signal proportional to the pressure, and transmits a signal to the pedestrian protection apparatus ECU10 via the signal line 10a.

  The pressure introducing pipe 82 is a substantially cylindrical pipe that introduces the pressure of the chamber space 7 a into the sensor main body 81, and extends downward from the sensor main body 81. The pressure introducing pipe 82 is inserted into an insertion port 73 c provided in the extending portion 72 of the chamber member 7. That is, the pressure introducing pipe 82 is inserted downward, and the inlet for introducing pressure faces downward. A slight gap (for example, about 0.1 to 1.5 mm) is formed between the inner circumference of the insertion port 73c and the outer circumference of the pressure introduction pipe 82, and this gap acts as a breathing hole. In a normal state in which no occurrence occurs, the atmospheric pressure in the chamber space 7a is kept the same as the outside air (atmospheric pressure).

  Here, in the present embodiment, the pressure sensor 8 is fixed to the bumper reinforcement upper surface 4 a via a bracket 9. As shown in FIGS. 5 and 6, the bracket 9 includes installation portions 91 and 92, upright portions 93 and 94, and a fixing portion 95. The installation portions 91 (92) are plate-like portions that are both ends in the longitudinal direction of the bracket 9 and are substantially parallel to the bumper reinforcement upper surface 4a, and have through holes 91a (92a). The upright portion 93 is a plate-like portion extending vertically upward from the end portion of the installation portion 91 on the installation portion 92 side. The upright portion 94 is a plate-like portion extending vertically upward from the end portion of the installation portion 92 on the installation portion 91 side.

  The fixing portion 95 is a plate-like portion that extends between the upper end of the upright portion 93 and the upper end of the upright portion 94. That is, the bracket 9 is formed in a bridge shape including the installation portions 91 and 92, the upright portions 93 and 94, and the central fixing portion 95. The fixing portion 95 has a through hole 95c into which the pressure introducing pipe 82 can be inserted at the center, and through holes 95a and 95b for fixing bolts are provided on both sides of the through hole 95c. The sensor main body 81 is bolted to the upper surface of the fixing portion 95. The bracket 9 is bolted to the bumper reinforcement upper surface 4b via a through hole 91a (92a). In FIG. 6, the barrier portion 74 is omitted.

  On the other hand, the extending portion 72 of the chamber member 7 is disposed between the upright portions 93 and 94 of the bracket 9 and between the fixing portion 95 and the bumper reinforcement upper surface 4b. That is, the bracket 9 has a structure in which the sensor body 81 is fixed to the upper surface of the fixing portion 95 while being fixed to the bumper reinforcement upper surface 4 b so as to straddle the extended portion 72. The barrier portion 74 is positioned in front of the vehicle from the vehicle front end portion of the bracket 9 and extends upward from the position of the fixing portion 95.

  The pedestrian protection device ECU 10 is an electronic control device for performing start-up control of a pedestrian protection device (not shown) (for example, a known pedestrian protection airbag or hood flip-up device), and is output from the pressure sensor 8. Signal is input via the transmission line 10a. 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. In addition to the pressure detection result in the pressure sensor 8, a vehicle speed detection result from a vehicle speed sensor (not shown) is input to the pedestrian protection device ECU 10, and a pedestrian collision is determined based on the pressure detection result and the vehicle speed detection result. It is preferable to configure as described above.

  Here, the effect in 1st embodiment is demonstrated. By providing the barrier portion 74 on the vehicle front side of the insertion port 73c, it is possible to prevent rainwater or the like from approaching the insertion port 73c from the front. As a result, the insertion port 73c and the pressure introduction pipe 82 Rainwater or the like can be prevented from entering the gaps between them. And since the clearance gap of the said insertion port 73c is not block | closed, a high pressure detection precision can be maintained. Further, by using the bracket 9, the side and the upper side of the insertion port 73c can be protected.

  Furthermore, since the shape of the barrier portion 74 is a simple flat plate, it is easy to mold the resin, and since it is formed integrally with the chamber member 7, the number of parts does not increase. And it is not necessary to increase material, and the increase in cost by forming the barrier part 74 can be suppressed.

  Other effects will also be described. According to the first embodiment, since the pressure sensor 8 is arranged on the vehicle rear side and the upper end side of the bumper reinforcement front surface 4a, the mounting operation of the pressure sensor 8 is performed by the bumper reinforcement 4. Installation work can be performed in a relatively free space without working in a narrow work area. That is, the workability of the mounting work is improved.

  In addition, since the pressure sensor 8 is connected to the extended portion 72 extending from the main body portion 71 of the chamber member 7 to the vehicle rear side, the stroke of the main body portion 71 is not reduced, and the chamber A sufficient stroke (width in the vehicle front-rear direction) can be ensured for the member 7 and the absorber 6. Therefore, even if the vehicle has a small front space or a vehicle with a small stroke of the absorber 6, high collision detection accuracy can be exhibited.

  Furthermore, since the pressure sensor 8 is arranged behind the vehicle front side of the bumper reinforcement 4a, the bumper reinforcement 4 protects the pressure sensor 8 against a collision from the front, and more reliable collision detection is possible. And Further, since the pressure introduction to the pressure sensor 8 is performed by the extending portion 72, the pressure sensor 8 is less susceptible to so-called air column resonance caused by air vibration in the chamber space 7a, and the pressure detection accuracy is improved.

  The width of the extending portion 72 in the vehicle width direction is smaller than the width of the bumper reinforcement 4 in the vehicle width direction, and work and installation space is secured above the bumper reinforcement 4. Since the extended portion 72 is located at the center of the chamber member 7 in the vehicle width direction, a work space and an installation space can be secured on both sides of the bumper reinforcement 4 in the vehicle width direction. Furthermore, since there is this installation space, the bracket 9 can be fixed to the bumper reinforcement upper surface 4b so as to straddle the extended portion 72, and the sensor main body 81 can be fixed to the upper surface of the bracket 9. That is, workability is improved, and the extended portion 72 can be positioned and space can be saved.

  Even when condensation occurs in the pressure introduction pipe 82, the pressure introduction pipe 82 is inserted downward, so that water droplets can be dropped by gravity. In this way, condensation or the like that hinders the introduction of pressure can be eliminated, and a reduction in detection accuracy of the pressure sensor 8 can be prevented.

  Further, since the insertion port 73c is formed on the protruding end surface 73a of the convex portion 73, the protruding end surface 73a is not easily bent due to the shape effect, and drilling by a drill or the like is facilitated, and the insertion port 73c is accurately formed. Can be formed.

<Second embodiment>
A vehicle collision detection apparatus according to a second embodiment will be described with reference to FIGS. FIG. 7 is a view showing the extending portion 72 in the second embodiment from above. 8 is a cross-sectional view taken along line AA in FIG. In the second embodiment, the shape of the barrier portion 74 of the first embodiment is modified and the convex portion 73 is removed. Therefore, other configurations are the same as those in the first embodiment, and the same reference numerals are given and description thereof is omitted. In the second embodiment, the insertion port 73 c is provided on the upper surface of the extending portion 72.

  The barrier unit 75 according to the second embodiment includes a barrier main body unit 751 and a cover unit 752. As shown in FIG. 7, the barrier main body 751 protrudes upward from the upper surface of the extending portion 72, and has a top-view arc convex shape (substantially U) so as to surround the vehicle front side and the side of the insertion port 73 c. It is formed in a wall shape. The cover portion 752 is formed integrally with the upper edge of the barrier main body 751 and has a flat plate shape extending in an arc-convex shape. As shown in FIG. 8, the cover portion 752 is located above the insertion port 73c and below the sensor body 81, and is inclined so that the vehicle rear side is higher than the vehicle front side. The cover 752 has a through hole 752a at a position corresponding to the insertion port 73c, and the pressure introducing pipe 82 is inserted into the through hole 752a. The barrier 75 is formed integrally with the chamber member 7. Further, in the second embodiment, the entire barrier portion 75 is accommodated below the fixing portion 95 of the bracket 9.

  According to this configuration, the barrier portion 75 can prevent rainwater and the like from entering the insertion port 73c from the front, side, and upper side of the vehicle. Therefore, the clearance gap of the insertion port 73c is protected more reliably.

  Further, as a modification of the second embodiment, as shown in FIG. 9, a barrier part 76 may be formed. That is, the barrier main body 761 is formed in a trapezoidal shape so as to surround the vehicle front side and the side side of the insertion port 73c. Similarly to the above, the cover portion 762 is integrally formed on the upper edge of the barrier main body 751 and is positioned above the insertion port 73c and below the sensor main body 81, with the vehicle rear side being higher than the vehicle front side. It is inclined to become. Also by this, the same effect as described above can be obtained. Note that the arc-convex shape as shown in FIG. 7 has better processability in resin integral molding than the trapezoidal shape. Moreover, you may improve workability by not forming a cover part.

<Third embodiment>
A vehicle collision detection apparatus according to a third embodiment will be described with reference to FIGS. 10 and 11. FIG. 10 is a schematic perspective view of the bracket 9 in the third embodiment. FIG. 11 is a diagram corresponding to FIG. 8 in the third embodiment. In the third embodiment, a barrier is provided on the bracket 9 of the first embodiment. Therefore, other configurations are the same as those in the first embodiment, and the same reference numerals are given and description thereof is omitted.

  As shown in FIGS. 10 and 11, the bracket 9 is provided with a barrier portion 96 extending downward from the vehicle front end portion of the fixing portion 95. The barrier portion 96 is made of the same material (metal) as the bracket 9, has a flat plate shape, and is formed integrally with the bracket 9. The barrier portion 96 extends downward from the vehicle front end portion of the fixed portion 95 to substantially the same height as the upper surface of the extending portion 72.

  According to this structure, since the barrier part 96 provided integrally with the bracket 9 is located on the vehicle front side of the insertion port 73c, the penetration of rainwater or the like into the insertion port 73c is performed as in the first embodiment. Can be prevented. Further, the bracket 9 extends to the side and the upper side of the insertion port 73c, and the insertion port 73c is surrounded by the bracket 9 and the barrier unit 96 on the vehicle front side, the side side, and the upper side. Yes. Therefore, intrusion of rainwater or the like can be prevented more reliably.

  Even if a slight gap is formed between the lower end portion of the barrier portion 96 and the upper surface of the extending portion 72, the function as a barrier can be exhibited. Moreover, in this embodiment, since the insertion port 73c is formed on the convex part 73, even if rain water etc. approach from the front clearance gap, the insertion port 73c is protected.

  In the third embodiment, the barrier portion 74 of the first embodiment may be provided on the upper surface of the extended portion 72. Thereby, the clearance gap of the insertion port 73c is further protected from rain water etc.

<Fourth embodiment>
Next, a vehicle collision detection device according to a fourth embodiment of the present invention will be described with reference to FIGS. 12 and 13. The fourth embodiment of the present invention is characterized in that a wet guard 83 as a barrier member is provided on the sensor body 81 side of the pressure sensor 8. FIG. 12 is a cross-sectional view of the fourth embodiment with the wet guard 83 provided. FIG. 13 is a view corresponding to FIG. 2 in the first embodiment, and is a side view showing the inside of the vehicle bumper on which the vehicle collision detection device of the fourth embodiment is mounted.

  In the first to third embodiments described above, a barrier member is provided integrally with the chamber or bracket on the chamber side or bracket side. However, in this embodiment, a barrier member is provided on the sensor body side of the pressure sensor. It is intended to be provided.

  That is, the present inventor, instead of providing the resin barrier member integrally with the chamber or the metal barrier member integrally with the bracket as in the first to third embodiments described above, the pressure sensor We focused on the point that if a barrier member is provided on the side, it would be possible to more effectively prevent the intrusion of moisture and the like from the insertion port into the chamber with a simpler configuration. In particular, as described above, in the configuration in which the convex part 73 protruding upward (in a columnar shape) from the upper surface of the chamber member 7 (the extension part 72 thereof) is formed, the sensor body 81 has a cylindrical shape below the sensor body 81. By providing the extending water-resistant guard 83, the gap between the insertion port (and the pressure introducing pipe) is sufficiently spaced to act as a breathing hole, and around the convex portion 73 (in a cylindrical shape). It has been found that if covered, moisture and the like can be prevented from entering the chamber from the insertion port more effectively. As described above, in order to maintain high pressure detection accuracy, it is necessary to prevent moisture and the like from entering the chamber from the insertion port as much as possible, but the vehicle collision detection device according to the embodiment of the present invention. However, it is not assumed that the vehicle equipped with this will be submerged, but it is assumed that, for example, the rainwater from the preceding vehicle will jump up during normal driving, etc. If the periphery of the portion 73 is covered from above with a cylindrical wet guard, it is possible to almost completely prevent the intrusion of rainwater and the like due to such splashing.

  In this embodiment, the cylindrical wet guard that covers the periphery of the insertion port is provided. However, the wet guard as a barrier member extending below the sensor main body 81 is, for example, a semi-cylindrical shape or a flat plate shape. And may be provided at least on the vehicle front side of the insertion port. Also with such a configuration, it is possible to effectively prevent the intrusion of rainwater or the like due to the above-described splashing of rainwater or the like from the preceding vehicle. However, in order to substantially completely prevent intrusion from all directions, it is more effective to cover the insertion port with a cylindrical water guard so as to substantially cap it.

  That is, in the present embodiment, as shown in FIG. 12, a wet guard 83 as a barrier member is formed on the sensor body 81 side. And the to-be-watered guard 83 is provided so that the one part may extend below from the sensor main body 81 so that the convex part 73 may overlap in an up-down direction. Further, the flooded guard 83 is formed in a cylindrical shape extending downward from the sensor body 81 so as to cover the periphery (omnidirectional) of the convex portion 73. More specifically, the cylindrical wet guard 83 has a pedestal portion 83A as shown in FIG. 12, and this pedestal portion 83A is bonded to a lid portion (lit) 81A that closes the lower side of the sensor body 81. Has been. In addition, the cylindrical guard 83 may be directly bonded to the lid (lit) 81A of the sensor main body 81 without providing the pedestal 83A. Further, the wet guard 83 and the pedestal portion 83A may be formed on the sensor body 81 side by other methods such as welding instead of bonding. The sensor body 81, the wet guard 83, and the pedestal portion 83A are preferably formed of, for example, PBT (polybutylene terephthalate) resin, PS (polystyrene) resin, or the like. Therefore, the wet guard 83 and the pedestal portion 83 </ b> A may be integrally formed of the same material as the sensor main body 81.

  FIG. 13 shows an example of the case where the pressure sensor 8 in which the wet guard 83 is formed on the sensor body 81 side is attached to the chamber member 7. In the example shown in FIG. 13, the pressure sensor 8 is fixed to the bumper reinforcement upper surface 4 b via a bracket 9 formed in a bridge shape straddling the extending portion 72. More specifically, the above-described pedestal portion 83A (see FIG. 12) is fixed to the upper surface of the fixing portion 95 (see FIG. 5) of the bracket 9. In the present embodiment, the through hole 95c (see FIG. 5) formed in the center of the fixing portion 95 is formed to have a size that allows the pressure introduction pipe 82 and the water guard 83 to be inserted. In FIG. 13, other configurations such as the bumper cover 3, the bumper reinforcement 4, the absorber 6, and the chamber member 7 are the same as those in the first embodiment, and the description thereof will be omitted by assigning the same reference numerals.

  According to the present embodiment, since the flooded guard 83 as a barrier member is formed on the sensor body 81 side, it can be inserted with a simpler structure than when the barrier member is formed integrally with the chamber member and the bracket. Intrusion of moisture or the like from the mouth into the chamber can be more effectively prevented. That is, a high waterproof effect can be obtained with a simple configuration. Further, since the flooded guard 83 is provided so as to extend downward from the sensor main body 81 so that a part thereof overlaps the convex portion 73 in the vertical direction, the convex portion 73 and the double barrier so-called Thus, it is possible to effectively prevent intrusion of rainwater and the like. That is, in order for rainwater or the like to enter the inside of the chamber from the insertion port, it must go through a twisted path as shown by arrow Y in FIG. Therefore, it is possible to effectively prevent intrusion due to splashing of rainwater from the preceding vehicle. Further, since the flooded guard 83 is formed in a cylindrical shape extending downward from the sensor body 81 so as to cover the periphery (omnidirectional) of the convex portion 73, it is possible to more effectively prevent intrusion of rainwater and the like from all directions. be able to. When the chamber member 7 and the water guard 83 are formed of a soft resin, the gap between the inner peripheral surface of the cylindrical water guard 83 and the outer peripheral surface of the convex portion 73 or the pressure introduction pipe 82 is inserted. Even if the gap (tolerance) with the opening 73c is brought into contact with the gap close to zero, it can function as the breathing hole described above. It is also possible to prevent water from entering the chamber.

  Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

It is a top view seeing through the inside of the vehicle bumper carrying the collision detection device for vehicles of a first embodiment of the present invention. It is a side view seeing through the inside of the vehicle bumper carrying the vehicle collision detection device of a first embodiment. It is the figure which showed the chamber member 7 from the vehicle front side. It is the figure which showed the extension part 72 from upper direction. 3 is a schematic perspective view of a bracket 9. FIG. It is the figure which showed the attachment state of the pressure sensor 8 from the vehicle front side. It is the figure which showed the extension part 72 in 2nd embodiment from upper direction. It is the sectional view on the AA line in FIG. It is the figure which showed the extension part 72 in the modification of 2nd embodiment from upper direction. It is a model perspective view of the bracket 9 in 3rd embodiment. It is a figure equivalent to FIG. 8 in 3rd embodiment. It is sectional drawing of the state which provided the to-be-watered guard 83 in 4th embodiment. It is a side view seeing through the inside of a vehicle bumper carrying a vehicle collision detection device of a fourth embodiment.

Explanation of symbols

1: vehicle collision detection device, 2: vehicle bumper,
4: bumper reinforcement, 4a: front surface, 4b: upper surface 7: chamber member, 71: main body portion, 72: extension portion,
73: convex portion, 73a: protruding end surface, 73c: insertion port,
74, 75, 76, 96: barrier part,
7a: chamber space,
8: Pressure sensor, 81: Sensor body, 82: Pressure introducing pipe, 83: Submerged guard,
9: Bracket, 10: Pedestrian protection device ECU

Claims (10)

A pressure sensor having a pressure sensor for introducing pressure into the sensor body, a pressure sensor having a pressure detection sensor, and a front surface of the bumper reinforcement in the vehicle bumper; And a chamber member having an insertion port into which the pressure introduction tube can be inserted, and the pressure introduction tube of the pressure sensor is inserted into the insertion port of 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,
A vehicle collision detection device comprising a barrier member provided at least on the vehicle front side of the insertion port.   The vehicle collision detection device according to claim 1, wherein the insertion port opens upward.   3. The vehicle collision detection device according to claim 1, wherein the barrier member is further provided on a vehicle side of the insertion port.   The said barrier member is a collision detection apparatus for vehicles as described in any one of Claims 1-3 which has the cover part which covers the upper direction of the said insertion port.   The vehicle collision detection device according to claim 4, wherein the cover is disposed above the insertion port and below the sensor body.   The vehicular collision detection apparatus according to any one of claims 1 to 5, wherein the barrier member is formed integrally with the chamber member. The chamber member includes an extending portion that partially extends from the front surface of the bumper reinforcement to the rear side of the vehicle and above the upper surface of the bumper reinforcement to form a part of the chamber space. , The insertion opening is opened in the extended portion,
The sensor body of the pressure sensor is fixed to the upper surface side of the bumper reinforcement through a bracket formed in a bridge shape straddling the extending portion,
The vehicle collision detection device according to any one of claims 1 to 5, wherein the barrier member is formed integrally with the bracket.   The vehicular collision detection device according to any one of claims 1 to 5, wherein the barrier member is formed on the sensor body side. The chamber member has a convex portion protruding upward from the upper surface of the extended portion,
The collision detection device for a vehicle according to any one of claims 1 to 8, wherein the insertion port is provided in the convex portion.   The vehicle collision detection device according to claim 9, wherein the barrier member is provided so as to extend upward from the extending portion so that at least a part of the barrier member overlaps the convex portion in the vertical direction.

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