JP5402908B2 - Vehicle collision detection device - Google Patents

Description

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

  In recent years, regarding vehicle safety, not only is it necessary to ensure the safety of vehicle occupants in the event of an accident, but also when a pedestrian collides with the vehicle, it is also required that the pedestrian does not receive fatal damage. . In a conventional vehicle collision detection device, as described in Patent Document 1, for example, a pressure detection chamber member disposed in a bumper of a vehicle is disposed on the front surface of a bumper reinforcement. When an object collides with the bumper, the pressed bumper crushes and deforms the chamber member. A change in pressure due to deformation of the chamber member at this time is detected, and it is determined whether or not the person is a pedestrian. When it is determined that the pedestrian has collided with the bumper of the vehicle, the vehicle collision detection device activates a device for protecting the pedestrian. Here, the chamber member is filled with air (air) inside, but does not have to be completely sealed, and breathing for allowing the air inside the chamber member and the outside air to flow through the chamber member. A hole may be provided. By providing such a breathing hole, it is possible to accurately detect the pressure change in the chamber member due to the collision with the bumper without being affected by the atmospheric pressure fluctuation due to the change in altitude.

  On the other hand, when the vehicle travels on a flooded road, water may enter the chamber member through the breathing hole described above. In such a case, when the vehicle escapes from the flooded road, the water accumulated inside the chamber member is discharged to the outside through the breathing hole. That is, the breathing hole of the chamber member not only functions as a breathing hole for communicating with the external atmosphere, but also functions as a drainage hole for discharging water in the chamber.

JP 2006-117157 A

  However, in the configuration in which a plurality of breathing holes are opened in the chamber member at the same height position on the lower surface side of the chamber member main body portion, the discharge amount of each breathing hole is the same, so that the water inside the chamber member is not easily discharged. There is a possibility that it takes time for the water accumulated in the chamber member to be completely discharged.

  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 easily discharge water that has entered the pressure detection chamber member.

Invention, bent shape that is bent vertically-than and forms a disposed to the chamber space on the front of the bumper reinforcement therein in bumper for a vehicle according to claim 1 which has been made to solve the above problems A chamber member having a chamber body provided with a section, and a pressure sensor for detecting the pressure in the chamber space, and configured to detect a collision with the vehicle bumper based on a detection result of the pressure sensor. In a vehicle collision detection device,
It said chamber member, call吸孔you open on the lower surface of the chamber body is provided at a plurality of locations across the bent shape portion,
At least one of the plurality of breathing holes is opened at a lower position than the other breathing holes, and forms a trigger for water discharge due to a difference in water discharge amount from the other breathing holes. Features.

According to this configuration, the chamber member having a chamber body bent shape portion is provided which is bent vertically is called吸孔you open to the lower surface of the chamber body is provided at a plurality of positions across the bent shape portion Therefore, the inside of the chamber body communicates with the outside atmosphere, and the pressure change in the chamber member due to the collision with the bumper can be accurately detected without being affected by the atmospheric pressure fluctuation due to the change in altitude. Further, since at least one of the plurality of breathing holes is opened at a lower position than the other breathing holes, when water enters the inside of the chamber body through the breathing holes, the water is accumulated. Water is quickly discharged to the outside through the breathing hole. In other words, when the height position of each breathing hole is the same, the discharge amount of each breathing hole is also the same, so water can be discharged if there is no air intrusion through the same hole at the same time as the drainage of water. Can not. On the other hand, in the configuration of the present invention, at least one breathing hole opens at a lower height position than the other breathing holes, so that the discharge amount becomes larger than the other breathing holes. For this reason, the difference in the discharge amount by the breathing hole forms a trigger for water discharge, and the water accumulated in the chamber member is quickly discharged to the outside.

  The invention according to claim 2 is characterized in that the at least one breathing hole is opened at a lower end of a tubular portion formed to project downward from a lower surface portion of the chamber body.

  According to this configuration, the at least one breathing hole is opened at the lower end of the tubular portion that protrudes downward from the lower surface portion of the chamber body, so that the processing hole does not enter the chamber body and the breathing hole is formed. It can be formed easily. For example, by forming a tubular portion whose tip is closed first by blow molding of the chamber member, the distal end of the tubular portion is cut in the radial direction and opened, so that the processing hole does not enter the chamber body and the breathing hole is formed. It can be formed easily.

According to a third aspect of the present invention, the chamber member includes a plurality of the tubular portions having different lengths.
The at least one breathing hole is characterized by opening at the lower end of the longest tubular portion among the plurality of tubular portions.

  According to this configuration, at least one of the plurality of breathing holes is formed at a lower height position than the other breathing holes, so that the water that has entered the chamber body and quickly accumulates can be quickly discharged to the outside. can do. Furthermore, the cutting position of the lower end part of the tubular part can be arbitrarily determined, and the height position of the breathing hole can be easily adjusted.

The invention according to claim 4 is configured such that the chamber body includes a plurality of regions having different height positions of the lower surface portion,
The at least one breathing hole is open to a lower surface side of a region having the lowest height position among the plurality of regions.

  According to this configuration, the water accumulated in the chamber main body is likely to gather in the lowest region of the height position, and the water accumulated in the chamber main body is quickly discharged to the outside.

  The invention according to claim 5 is characterized in that the plurality of breathing holes are provided on the lower surface side of the chamber body and on the vehicle rear side of the chamber body.

  According to this configuration, since the plurality of breathing holes are provided on the lower surface side of the chamber main body and on the vehicle rear side of the chamber main body, water accumulated in the chamber main body can be easily discharged out of the vehicle. For example, in a configuration in which the chamber member is disposed above the front surface of the bumper reinforcement and an absorber for absorbing an impact is disposed below the chamber member, the lower surface side of the chamber body and the vehicle rear of the chamber body. The water discharged from the breathing hole provided on the side is easily discharged out of the bumper through the gap between the absorber and the bumper reinforcement.

  According to a sixth aspect of the present invention, an absorber for absorbing an impact at the time of the collision is disposed below the chamber member, and at least a part of a rear end surface of the absorber is provided with a buffer against the breathing hole. And a relief portion for securing a conduction path is recessed.

  According to this configuration, since the absorber and the breathing hole can be physically buffered and the conduction path can be prevented from being blocked, water accumulated in the chamber body can be reliably discharged.

It is a whole lineblock diagram showing the collision detection device for vehicles of an embodiment by plane view. FIG. 2 is a cross-sectional view taken along line AA of the vehicle collision detection device shown in FIG. 1. It is a front view which shows the chamber member and bumper reinforcement of embodiment. It is sectional drawing which shows the breathing hole (tubular part) periphery of the chamber member of embodiment by front view. It is explanatory drawing which shows the manufacturing process of the breathing hole in the chamber member of embodiment, (a) is sectional drawing which shows the tubular part immediately after blow molding, (b) is sectional drawing which shows the lower end part cutting | disconnection of a tubular part It is. It is a figure explaining discharge | emission from the breathing hole of the water collected in the chamber member, (a) is a schematic cross section which shows a comparative example, (b) is a schematic cross section which shows embodiment. It is sectional drawing which shows the breathing hole periphery of the chamber member in a 1st modification by front view. It is a front view which shows the chamber member of a 2nd modification. It is a front view which shows the chamber member of a 3rd modification. It is a front view which shows the chamber member of a 4th modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a vehicle collision detection device according to 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 an embodiment of the present invention in a plan view. FIG. 2 is a cross-sectional view of the main part of the vehicular collision detection apparatus 1 as viewed from the side (cross section taken along the line AA in FIG. 1). FIG. 3 is a front view showing the chamber member 7 and the bumper reinforcement 4. FIG. 4 is a sectional view showing the periphery of the breathing hole 721a (tubular portion 721) in a front view. 5A is a cross-sectional view of the tubular portion 721 immediately after blow molding (a region surrounded by a dotted line B in FIG. 4), and FIG. 5B is a cross-sectional view after cutting the lower end portion of the tubular portion 721.

  As shown in FIG. 1, the vehicle collision detection device 1 is mainly configured by a bumper cover 3 disposed in a vehicle bumper 2, a chamber member 7, a pressure sensor 8, and a pedestrian protection device ECU 10. The

  As shown in FIGS. 1 and 2, the 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. 2 shows the bumper cover 3, the bumper reinforcement 4, the absorber 6, the chamber member 7, and the pressure sensor 8 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 disposed in the bumper cover 3 and is disposed in the vehicle width direction. As shown in FIG. It is the hollow member which has the shape of a letter-shaped cross section. A chamber member 7 and an absorber 6 are disposed on the front side of the bumper reinforcement 4. Further, as shown in FIG. 3, the bumper reinforcement 4 has an attachment portion 41 for attaching a securing hook or a towing hook (not shown) used for towing the vehicle only on the left side with respect to the vehicle. . Here, an example in which the attachment portion 41 is only on the left side with respect to the vehicle is shown, but depending on the vehicle, a configuration having the right portion or the central portion may be employed. The bumper reinforcement 4 has two sets of boss mounting portions 42 and 44 and boss mounting portions 43 and 45 for mounting a boss (not shown) that fixes the absorber 6. The first set of boss mounting portions 42 and 44 are positioned on the left side of the bumper reinforcement 4 on the vehicle, and the second set of boss mounting portions 43 and 45 are positioned on the right side of the vehicle. The first set of boss mounting portions 42 and the second set of boss mounting portions 43 are located substantially in the center of the bumper reinforcement 4 with respect to the vehicle vertical direction. The first set of boss mounting portions 44 and the second set of boss mounting portions 45 are located below the boss mounting portions 42 and 43 and slightly closer to the center in the vehicle width direction. That is, the two sets of boss mounting portions 42 and 44 and the boss mounting portions 43 and 45 are disposed substantially symmetrically with an interval in the vehicle width direction.

  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. A bumper reinforcement 4 is attached to the front end of the side member 5.

  The absorber 6 is a foamed resin member having an impact absorbing action, and is attached to the lower side of the front surface 4 a of the bumper reinforcement 4 in the bumper cover 3. A chamber member 7 is disposed above the absorber 6. A part of the rear end surface of the absorber 6 is formed with a relief portion 6a that forms a gap with the front surface 4a of the bumper reinforcement 4 as shown in FIG. Breathing holes 721a to 723a of the chamber member 7 which will be described later are positioned above the gap, thereby avoiding physical buffering with the absorber 6 and securing a conduction path. Thus, the absorber 6 and the breathing holes 721a to 723a can be physically buffered and the conduction path can be prevented from being blocked, so that the water accumulated in the chamber body 71 can be reliably discharged.

  The chamber member 7 is disposed in front of the front surface 4 a of the bumper reinforcement 4 and above the absorber 6. The chamber member 7 is a substantially box-shaped hollow member made of a soft resin such as polyethylene and extending in the vehicle width direction. The chamber member 7 is formed with a chamber space 7a surrounded by a wall having a cross-sectional thickness of several millimeters, and is filled with the atmosphere. Has been.

  More specifically, the chamber member 7 includes a chamber body 71, tubular portions 721 to 723 having breathing holes 721a to 723a, and an extending portion 73.

  As shown in FIG. 3, the chamber main body 71 occupies most of the chamber member 7 and has a shape in which the height L from the lower surface side to the upper surface 71e side is substantially constant. That is, the pressure detected at the time of the collision by the pressure sensor 8 is substantially constant over the vehicle width direction.

  The chamber body 71 includes, in order from the left end to the right end with respect to the vehicle, a left end portion 71d, an outer inclined portion 71c, an inner inclined portion 71b, a central portion 71a located in the center, an inner inclined portion 71br, an outer inclined portion 71cr, and a chamber. An end portion 71dr located at the right end of the main body 71 is formed to be connected to each other, and shares the chamber space 7a.

  The end portion 71d is connected to the outer inclined portion 71c and positioned at the left end with respect to the vehicle of the chamber body 71, and the lower surface portion of the end portion 71d is positioned higher than the lower surface portion of the central portion 71a in the vertical direction of the vehicle. doing. Similarly, the end portion 71dr is connected to the outer inclined portion 71cr and positioned at the right end with respect to the vehicle of the chamber main body 71, and the lower surface portion of the end portion 71dr with respect to the vertical direction of the vehicle rather than the lower surface portion of the central portion 71a. Is located high. The height of the end portion 71d and the end portion 71dr in the vertical direction of the vehicle is substantially the same.

  One of the outer inclined portions 71c is connected to the end portion 71d and is lower, and the other is connected to the inner inclined portion 71b and is inclined higher. In addition, one of the inner inclined portions 71b is connected to the outer inclined portion 71c and is higher, and the other is connected to the central portion 71a and is inclined lower. One of the outer inclined portions 71cr is connected to the end portion 71dr and is lower and the other is connected to the inner inclined portion 71br and is inclined higher. In addition, one of the inner inclined portions 71br is connected to the outer inclined portion 71cr and is higher and the other is connected to the central portion 71a and is inclined lower. That is, the chamber main body 71 is configured by regions having different height positions of the lower surface portion, and the central portion 71 a is the region having the lowest height position among the plurality of regions of the chamber main body 71.

  A portion formed by the inner inclined portion 71b and the outer inclined portion 71c is formed in a mountain shape so as to avoid the attachment portion 41 and the boss attachment portion 42 of the bumper reinforcement 4 upward. Similarly, the portion formed by the inner inclined portion 71br and the outer inclined portion 71cr is configured to avoid the boss mounting portion 43 on the upper side. That is, the chamber main body 71 has a mountain shape on both the left and right sides of the chamber main body 71 so as to avoid the mounting portion 41 and the boss mounting portions 42 and 43 of the bumper reinforcement 4. That is, in the chamber body 71, the inner inclined portion 71b is inclined toward the central portion 71a (the inner inclined portion 71br is inclined toward the central portion 71a), and the outer inclined portion 71c is inclined toward the end portion 71d (the outer inclined portion 71cr is toward the end portion 71dr). Inclined. Since the front side of the attachment portion 41 is not blocked by the chamber body 71, a securing hook or the like can be attached from the front side of the bumper when necessary. Further, since the front side of the boss attachment portions 42 and 43 is not blocked by the chamber body 71, the absorber 6 can be fixed to the bumper reinforcement 4 by attaching the boss together with the boss attachment portions 44 and 45. .

  The tubular portions 721 to 723 are formed so as to protrude downward from the lower surface portion of the chamber body 71. That is, the tubular portion 721 protrudes from the lower surface side of the central portion 71a of the chamber body 71, the tubular portion 722 protrudes from the lower surface side of the end portion 71d, and the tubular portion 723 protrudes downward from the lower surface side of the end portion 71dr. The lengths of the three tubular portions 721 to 723 are all the same. As shown in FIG. 2, the three tubular portions 721 to 723 are formed on the rear side in the vehicle front-rear direction of the chamber body 71 and closer to the front surface 4 a of the bumper reinforcement 4.

  Also, a breathing hole 721a is opened at the lower end of the tubular portion 721, a breathing hole 722a is opened at the lower end of the tubular portion 722, and a breathing hole 723a is opened at the lower end of the tubular portion 723, respectively. Each of the breathing holes 721a to 723a is a circular hole having a diameter of about 4 mm. As described above, the breathing holes 721a to 723a are formed in the center part 71a located at the center of the chamber main body 71 and the end parts 71d and 71dr symmetrically at a constant interval. And the breathing hole 721a of the center part 71a of the chamber main body 71 is positioned lower than the breathing holes 722a and 723a on both sides in the vehicle width direction by a height difference h with respect to the vertical direction of the vehicle. The height difference h between the breathing hole 721a formed at the low position and the breathing holes 722a and 723a formed at the high position is about 8 mm, and there may be a height difference.

  Next, a method for manufacturing the chamber member 7 will be described. As shown in FIG. 4, the breathing hole 721 a is formed to open at the lower end of the tubular portion 721, and the atmosphere in the chamber space 7 a and the outside atmosphere circulate through the breathing hole 721. In addition, since it is the same also about the tubular parts 722 and 723, drawing is abbreviate | omitted.

  The chamber member 7 is formed by, for example, molding a set of molds and clamping the molds, and pouring a soft resin melted in the molds. In the chamber member 7, the chamber main body 71, the three tubular portions 721 to 723, and the extending portion 73 are integrally formed of the same resin material. After the blow molding, the chamber member 7 taken out from the mold is formed such that the tubular portion 721 protrudes downward from the lower surface side of the central portion 71a of the chamber main body 71 as shown in FIG. The end portion 71d and the tubular portion 723 are formed on the end portion 71dr). At this time, the distal end of the tubular portion 721 is closed. After that, as shown in FIG. 5B, opened breathing holes 721a to 723a are formed by cutting the lower ends of the tubular portions 721 to 723 in the radial direction. By forming the breathing holes 721a to 723a, the atmosphere in the chamber space 7a and the outside atmosphere can be circulated, and water can be discharged when entering the chamber body 71.

  Here, the discharge of water accumulated in the chamber main body 71 from the breathing holes will be described with reference to FIG. FIG. 6A is a schematic cross-sectional view of a chamber body 71 'showing a comparative example. The chamber body 71 'of the comparative example includes breathing holes 721a' to 723a 'having the same height position. On the other hand, FIG. 5B is a schematic cross-sectional view of the chamber body 71 showing the embodiment. As described above, in the chamber main body 71 of the embodiment, the height position of the breathing hole 721a is lower than the height positions of the other breathing holes 722a and 723a.

  A plurality of breathing holes 721a 'to 723a' for discharging water are disposed on the lower surface side of the chamber body 71 'of the comparative example. In the chamber main body 71 ′ of the comparative example, water is poured up to a height difference H <b> 1 from the breathing holes 721 a ′ to 723 a ′ to the water surface. If the height difference is the same, water will not be discharged unless air enters the container at the same time as the water is discharged. The amount of water discharged can be calculated from √ (2 gH) (Trichelli's theorem) as A * C * √ (2 gH) (A is the cross-sectional area of the discharge hole, C is the flow coefficient, g is the gravitational acceleration, and H is Difference in height.) Here, C and g are considered to be constant, and if the width of the breathing hole, that is, the cross-sectional area A is the same in each breathing hole, the amount of water discharged is proportional to the height difference. Therefore, the breathing holes 721a 'to 723a' discharge water with the same discharge amount.

  Similarly, three breathing holes 721a to 723a for discharging water are disposed on the lower surface side of the chamber body 71. Of the three breathing holes 721a to 723a, the breathing hole 721a provided at the center is deeper than the other two breathing holes 722a and 723a.

  That is, in the chamber main body 71, the height difference H2 from the central breathing hole 721a to the water surface and the height difference H1 from the breathing holes 722a, 723a to the water surface are higher than the height difference H1. Yes. Note that the breathing holes 721a to 723a have the same width. As described in the case of the chamber main body 71 ′ of the comparative example, the amount of water discharged is proportional to the height difference, so the amount of water discharged from the central breathing hole 721a is large, and water is quickly discharged. be able to. Therefore, it can be understood that the breathing hole of the chamber body 71 of the embodiment has a larger water discharge amount and discharges water more quickly than the chamber body 71 ′ of the comparative example.

  The extending portion 73 is formed substantially at the center with respect to the vehicle width direction of the chamber main body 71, extending from the upper surface side of the chamber main body 71 to the vehicle rear side, and positioned on the upper surface of the bumper reinforcement 4. Is provided. The extending portion 73 forms a part of the chamber body 71 and shares the chamber space 7a. A bracket 9 for fixing the pressure sensor 8 is insert-molded on the upper surface side of the extending portion 73, and the pressure sensor 8 is attached via the bracket 9. The bracket 9 has a hole, and the pressure sensor 8 detects the pressure in the chamber space 7a through the hole.

  The pressure sensor 8 is a sensor device that can detect a gas pressure, and includes a pressure introduction pipe 81 for detecting pressure and a main body of the pressure sensor 8. The main body of the pressure sensor 8 includes a sensor element for pressure detection. Is provided. The pressure sensor 8 detects the pressure in the chamber space 7a. Then, the pressure sensor 8 outputs a pressure value and transmits a signal to the pedestrian protection apparatus ECU10 via the signal line 10a.

  As shown in FIG. 1, the pedestrian protection apparatus ECU10 is connected to the pressure sensor 8 through a signal line 10a and is disposed in the vehicle body. 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. A signal is input through the signal line 10a. The pedestrian protection device ECU 10 determines whether or not a pedestrian or the like has collided with the bumper 2 of the vehicle, and executes processing for operating the pedestrian protection device.

  Next, detection of a collision by the vehicle collision detection apparatus 1 of the present embodiment will be described. When a pedestrian collides with the bumper 2 of this vehicle, the part where the pedestrian collides presses the chamber main body 71 of the chamber member 7 via the bumper cover 3, and the pressed portion is deformed and crushed. When the chamber body 71 is deformed and crushed, the pressure in the chamber space 7a of the chamber body 71 changes. Next, the pressure sensor 8 detects the pressure in the chamber space 7a, and a pressure signal is transmitted to the pedestrian protection device ECU10. And pedestrian protection apparatus ECU10 performs the process which discriminate | determines whether the pedestrian collided based on the signal from the pressure sensor 8. FIG.

  As is clear from the above detailed description, according to the present embodiment, the chamber member 7 includes the three breathing holes 721a to 723a that open on the lower surface side of the chamber main body 71. A change in pressure in the chamber member 7 due to a collision with the bumper 2 can be accurately detected without communicating with the external atmosphere and without being affected by atmospheric pressure fluctuations due to changes in altitude.

  Of the three breathing holes 721a to 723a, the breathing hole 721a is formed at a lower position than the other breathing holes 722a and 723a, so that water enters the chamber body 71 through the breathing hole. In this case, the accumulated water is quickly discharged to the outside through the breathing holes 721a to 723a. In other words, when the height position of each breathing hole is the same, the discharge amount of each breathing hole is also the same, so water can be discharged if there is no air intrusion through the same hole at the same time as the drainage of water. Can not. On the other hand, in the configuration of the present invention, at least one breathing hole 721a opens at a lower position than the other breathing holes 722a and 723a, so that the discharge amount is higher than that of the other breathing holes 722a and 723a. growing. For this reason, the difference in the discharge amount by the breathing hole forms a trigger for water discharge, and the water accumulated in the chamber member 7 is quickly discharged to the outside.

  The chamber body 71 has tubular portions 721 to 723 protruding downward from the lower surface portion of the chamber body 71, a breathing hole 721 a at the lower end of the tubular portion 721, and a breathing hole 722 a at the lower end of the tubular portion 722. Since the breathing hole 723a is opened at the lower end of 723, the breathing hole can be easily formed without any processing powder entering the chamber body 71. For example, the tubular member 7 is first blown to form a tubular portion whose tip is closed, and the distal end of the tubular portion is cut in the radial direction and opened, so that the working powder does not enter the chamber body 71 and breathe. The holes 721a to 723a can be easily formed.

  The chamber body 71 is composed of regions having different height positions of the lower surface portion, and the breathing hole 721a opens to the lower end of the tubular portion 721 on the lower surface side of the central portion 71a, which is the region having the lowest height position. The water accumulated inside the member 7 is likely to gather in the lowest region, and the water accumulated inside the chamber member 7 is quickly discharged to the outside.

  Furthermore, since the breathing holes 721a to 723a are provided on the lower surface side of the chamber main body 71 and on the vehicle rear side of the chamber main body 71, the water accumulated in the chamber main body 71 can be easily discharged out of the vehicle.

  Further, a part of the rear end surface of the absorber 6 disposed below the chamber member 7 is provided with a relief portion 6a that divides a gap from the front surface 4a of the bumper reinforcement 4, so that the absorber 6 and the breathing holes 721a to 723a can be physically buffered to prevent the conduction path from being blocked, so that the water accumulated in the chamber body 71 can be reliably discharged.

  Next, a first modification of the embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view showing the periphery of the breathing hole 721a of the chamber member 7 of the vehicle collision detection apparatus 1 according to this modification in front view. The extended portion 73, the pressure sensor 8, the bumper reinforcement 4 and the like are omitted. And the same code | symbol is attached | subjected to the structure same as embodiment mentioned above, the detailed description about them is abbreviate | omitted, and a different point from embodiment is mainly demonstrated (same also in the following modifications).

  In the above embodiment, the chamber member 7 is configured to include the tubular portions 721 to 723 on the lower surface portion of the chamber main body 71. However, in the present modification, the chamber main body 71 is not formed with the tubular portion. About another structure, it is the same as that of the said embodiment. In this modified example, as shown in FIG. 7, a breathing hole 721a opened at the lower end on the lower surface side of the central portion 71a is provided without forming the tubular portion 721 on the lower surface side of the central portion 71a of the chamber body 71. . The breathing hole 721a without the tubular portion 721 is opened from the outside on the lower surface side of the central portion 71a of the chamber body 71 by using a drilling device such as a drill after blow molding of the chamber member 7. In addition, since the processing powder generated by using a drilling instrument such as a drill may enter the inside of the chamber body 71 after opening the breathing hole, it is necessary to remove the processing powder. The same applies to the other breathing holes 722a and 723a in that the tubular portions 722 and 723 are not formed.

  Thus, even when the tubular portion is not formed in the chamber body 71, as shown in FIG. 3, the height position of the lower surface portion of the central portion 71a is higher than the lower surface portion of the end portion 71d and the lower surface portion of the end portion 71dr. Therefore, the breathing hole 721a of the central portion 71a is at a lower position than the other breathing holes 722a and 723a. The breathing hole 721a is formed at a height position lower than the breathing holes 722a and 723a by the height difference h. Therefore, when the breathing hole 721a opens at a lower position than the other breathing holes 722a and 723a, the discharge amount becomes larger than the other breathing holes 722a and 723a, and there is a difference in the discharge amount due to the breathing holes. A trigger for water discharge is formed, and water accumulated in the chamber member 7 is quickly discharged to the outside.

  Further, the breathing hole 721a is opened on the lower surface side of the central portion 71a, which is the lowest region among the plurality of regions of the chamber body 71, so that the water accumulated in the chamber member 7 gathers in the lowest region. It is easy and the water accumulated in the chamber member 7 is quickly discharged to the outside.

  Next, a second modification of the embodiment will be described with reference to FIG. FIG. 8 is a front view of the chamber member 7 of the vehicle collision detection apparatus 1 according to this modification as seen from the front. The three breathing holes 721a to 723a in the above embodiment are at a height position where the breathing hole 721a of the central portion 71a is lower than the breathing holes 722a and 723a of the end portions 71d and 71dr, and the breathing holes 722a and 723a are the breathing holes 721a. It was set as the structure formed in a higher position. On the other hand, in this modification, as shown in FIG. 8, the lower surfaces of the end portions 71d and 71dr of the chamber body 71 are formed at a lower height than the lower surface of the central portion 71a. More specifically, in the chamber body 71, the left end 71d, the inner inclined portion 71b, the central portion 71a, the inner inclined portion 71br, and the right end 71dr are connected to the vehicle in order from the left end to the right end. And share the chamber space 7a.

  One of the inner inclined portions 71b is connected to the end portion 71d, and the other is connected to the central portion 71a. One of the inner inclined portions 71br is connected to the end portion 71dr and is lower and the other is connected to the central portion 71a and is inclined higher. That is, the lower surface portion of the central portion 71a is formed at a position higher than the lower surface portions of the end portions 71d and 71dr. That is, the end portions 71 d and 71 dr are regions having the lowest height position among the plurality of regions of the chamber body 71. Therefore, the breathing holes 722a and 723a of the end portions 71d and 71dr are formed at a height position lower than the breathing hole 721a of the central portion 71a. The breathing holes 722a and 723a are formed at a height position lower than the breathing hole 721a by a height difference h. In addition, the length of the tubular parts 721-723 is the same.

  According to this modified example, the breathing holes 722a and 723a among the three breathing holes 721a to 723a are formed at a height position lower than the breathing hole 721a, thereby having the same effect as the above embodiment. The water that has entered the chamber body 71 and accumulated can be quickly discharged to the outside.

  Next, third and fourth modifications of the embodiment will be described with reference to FIGS. FIG. 9 is a front view of the chamber member 7 in the third modification. FIG. 10 is a front view of the chamber member 7 in the fourth modification. In the above embodiment and the second modification, the lengths of the three tubular portions 721 to 723 are the same, and the height positions of the respective breathing holes 721a to 723a are the central portion 71a, the end portion 71d, It was determined by the height position of the lower surface portion of 71 dr.

  On the other hand, in the third and fourth modifications, the chamber member 7 includes tubular portions having different lengths, and at least one breathing hole is opened at the lower end of the longest tubular portion among the three tubular portions 721 to 723. The configuration is as follows. The height positions of the lower surface portions of the central portion 71a and the end portions 71d and 71dr are substantially the same.

  That is, in the third modified example, as shown in FIG. 9, the tubular portion 721 of the central portion 71 a among the three tubular portions 721 to 723 is formed longer than the other tubular portions 722 and 723. A breathing hole 721 a is opened at the lower end of the tubular part 721, a breathing hole 722 a is opened at the lower end of the tubular part 722, and a breathing hole 723 a is opened at the lower end of the tubular part 723. The breathing hole 721a is formed at a height position lower than the other breathing holes 722a and 723a by the height difference h.

  Further, in the fourth modified example, as shown in FIG. 10, the tubular portion 722 of the end portion 71d and the tubular portion 723 of the end portion 71dr out of the three tubular portions 721 to 723 are more than the tubular portion 721 of the central portion 71a. It is formed long. A breathing hole 722 a is opened at the lower end of the tubular portion 722, a breathing hole 723 a is opened at the lower end of the tubular portion 723, and a breathing hole 721 a is opened at the lower end of the tubular portion 721. The breathing holes 722a and 723a are formed at a height position lower than the breathing hole 721a by a height difference h.

  According to the third and fourth modified examples, at least one of the three breathing holes 721a to 723a is formed at a height position lower than the other breathing holes, and thus enters and accumulates in the chamber body 71. Water can be quickly discharged to the outside. Furthermore, the cutting position of the lower ends of the tubular portions 721 to 723 can be arbitrarily determined, and the height positions of the breathing holes 721a to 723a can be easily adjusted.

  The present invention is not limited to the above-described embodiments and modifications, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. For example, although the number of breathing holes in the above-described embodiments and modifications is three, the number is not limited and may be changed depending on the size and shape of the chamber member 7. Further, in accordance with the arrangement and shape of the absorber 6, the breathing hole may be formed at the front side or the center of the chamber main body 71 in the vehicle front-rear direction. The chamber body 71 may be configured by combining a breathing hole opened at the lower end of the tubular portion and a breathing hole without the tubular portion.

1: Vehicle collision detection device 2: Bumper 3: Bumper cover 4: Bumper reinforcement 4a: Bumper reinforcement front 5: Side member 6: Absorber 7: Chamber member 7a: Chamber space 71: Chamber body 71a: Central part 71b, 71br: Inner inclined portion 71c, 71cr: Outer inclined portion 71d, 71dr: End portion 721a-723a: Breathing hole 721-723: Tubular portion 71 ': Comparative chamber body 721a'-723a': Respiratory breath Hole 8: Pressure sensor 10: Pedestrian protection device ECU 10a: Signal line

Claims (6)

A chamber member having a bumper reinforcement chamber body bent shape portion is provided to bend the disposed to the chamber space and the vertical Ri greens formed inside the front in the bumper of the vehicle, in the chamber space A vehicle collision detection device comprising: a pressure sensor for detecting pressure; and configured to detect a collision with the vehicle bumper based on a detection result of the pressure sensor.
It said chamber member, call吸孔you open on the lower surface of the chamber body is provided at a plurality of locations across the bent shape portion,
At least one of the plurality of breathing holes is opened at a lower position than the other breathing holes, and forms a trigger for water discharge due to a difference in water discharge amount from the other breathing holes. A vehicle collision detection device.   2. The vehicle collision detection device according to claim 1, wherein the at least one breathing hole opens at a lower end of a tubular portion that protrudes downward from a lower surface portion of the chamber body. The chamber member includes a plurality of the tubular portions having different lengths,
The vehicle collision detection device according to claim 2, wherein the at least one breathing hole opens at a lower end of the longest tubular portion among the plurality of tubular portions. The chamber body is composed of a plurality of regions having different height positions of the lower surface portion,
4. The vehicle collision detection device according to claim 1, wherein the at least one breathing hole opens on a lower surface side of a region having the lowest height position among the plurality of regions. 5. .   5. The vehicle collision detection device according to claim 1, wherein the plurality of breathing holes are provided on a lower surface side of the chamber main body and on a vehicle rear side of the chamber main body.   An absorber for absorbing an impact at the time of the collision is disposed below the chamber member, and at least a part of the rear end surface of the absorber avoids buffering with the breathing hole and secures a conduction path. The vehicular collision detection device according to any one of claims 1 to 5, wherein the relief portion is recessed.

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