JP6020404B2 - Vehicle collision detection device - Google Patents

Description

  The present invention relates to a vehicle collision detection apparatus including a chamber member manufactured by extrusion molding and a mounting portion for attaching the chamber member to a vehicle.

  In recent years, regarding the safety of vehicles, not only the safety of vehicle occupants is ensured in the event of an accident, but also it is required that fatal damage to pedestrians be avoided when pedestrians collide with vehicles. Yes. In a conventional vehicle collision detection device, for example, as described in Patent Document 1, a pressure detection hose is disposed on the front surface of a bumper reinforcement in a vehicle bumper via an absorber, and an obstacle is detected. When the bumper collides, the pressed absorber is configured to crush and deform the hose. At this time, a change occurs in the pressure in the hose due to the deformation of the hose, and it can be determined whether or not the obstacle is a pedestrian by detecting it. 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 hose for pressure detection described in Patent Document 1 is housed in a groove formed on the surface facing the bumper reinforcement of the absorber, and is configured to have a relatively small inner and outer diameter. Therefore, the sensitivity of pressure detection can be increased.

German Patent Application Publication No. 10201101964

  However, according to this prior art, in addition to the hose being loosely inserted into the groove and being insufficiently fixed, the hose is subjected to a collision force via the absorber, so that pressure detection becomes unstable. .

  The present invention has been made in view of the above-described problems, and provides a vehicle collision detection device that can easily fix a chamber member that can be disposed following the surface shape of a bumper reinforcement. Objective.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a chamber space (7a) is formed inside the bumper cover (3) in contact with the bumper reinforcement (4) at the rear of the vehicle. Chamber member (7) and a pressure sensor (9) for detecting the pressure in the chamber space (7a). Based on the detection result of the pressure sensor (9), the bumper cover (3) A vehicle collision detection device (1) configured to detect a collision, wherein the chamber member (7) protruding from a side surface of the chamber member (7) is connected to the bumper reinforcement (4). ) And a bracket (15) separate from the chamber member (7) attached to the attachment portion (8) .

According to this configuration, the side surface of the chamber member (7), which is disposed in contact with the bumper reinforcement (4) at the rear of the bumper cover (3) and has a chamber space (7a) formed therein, Since the mounting portion (8) is provided in a protruding manner, the chamber member (7) can be easily and reliably fixed to the bumper reinforcement (4). Moreover, since a bracket separate from the chamber member (7) is attached to the attachment portion (8), the chamber member (7) can be firmly and securely fixed to the bumper reinforcement (4).

It is a whole lineblock diagram showing the collision detection device for vehicles of the present invention by plane view. It is the II-II sectional view taken on the line of the vehicle collision detection apparatus shown in FIG. It is sectional drawing which shows the detail of the attachment form of the chamber member in FIG. It is sectional drawing which shows the other form in FIG. It is a top view which shows 1st embodiment regarding formation of an attaching part. It is the VI-VI sectional view taken on the line in FIG. It is a top view which shows 2nd embodiment regarding formation of an attaching part. It is the VIII-VIII sectional view taken on the line in FIG. It is a top view which shows 3rd embodiment regarding formation of an attaching part. It is a top view which shows 4th embodiment regarding formation of an attaching part. It is the XI-XI sectional view taken on the line in FIG. It is a top view which shows 5th embodiment regarding formation of an attaching part. It is the XIII-XIII sectional view taken on the line in FIG. It is a top view which shows 6th embodiment regarding formation of an attaching part. It is the XV-XV sectional view taken on the line in FIG.

  Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. However, in all the drawings in this specification, parts corresponding to each other or parts having the same function are denoted by the same reference numerals, and description of the overlapping parts will be omitted as appropriate.

  As shown in FIG. 1, the vehicle collision detection device 1 is mainly configured by a bumper cover 3, a chamber member 7, a pressure sensor 9, and a pedestrian protection device ECU 10 disposed in a bumper 2 of the vehicle.

  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 and the chamber member 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) cover member attached to the vehicle body so as to cover the bumper reinforcement 4, the absorber 6, and the chamber member 7. It is.

  The bumper reinforcement 4 is disposed in the bumper cover 3 in the vehicle width direction, and as shown in FIG. 2, is a shelf-shaped metal hollow structure member having one or a plurality of beams therein. is there. A chamber member 7 is provided along with the absorber 6 on the mounting surface 4 a on the vehicle front side of the bumper reinforcement 4 in the vehicle vertical direction. The mounting surface 4a is bent or curved at different positions and numerical values for each vehicle type in the vehicle width direction and the vertical 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 below the attachment 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 provided with a relief portion 6a that forms a gap with the mounting surface 4a of the bumper reinforcement 4 as shown in FIG.

  The chamber member 7 is disposed above the absorber 6 on the mounting surface 4 a of the bumper reinforcement 4. That is, the chamber member 7 is disposed so as to contact the bumper reinforcement 4 at the rear of the bumper cover 3 in the vehicle. The chamber member 7 is a hollow member having a rectangular cross section made of rubber or flexible soft resin and extending in the vehicle width direction. An example of the chamber member 7 is a small chamber of 27 mm × 27 mm. The wall thickness of the chamber member 7 is several millimeters, and the chamber space 7a is formed by the inner surface thereof. The chamber member 7 is not limited to a rectangular cross section, and may be, for example, a round cross section.

  The chamber member 7 is manufactured by extrusion molding in which plasticized rubber or a flexible soft resin material is extruded from a die having a shape corresponding to the cross-sectional shape of the chamber space 7a. The extruded long chamber member 7 is appropriately cut according to the creepage distance in the vehicle width direction on the mounting surface 4a to which the chamber member 7 of the bumper reinforcement 4 is attached, and becomes an individual chamber member 7. By providing the pressure sensor 9, the opening surfaces at both ends of the cut chamber member 7 are closed so that a small breathing hole remains.

  The pressure sensor 9 is a sensor device including a sensor element that can detect a gas pressure. The pressure sensor 9 detects the pressure in the chamber space 7a. Then, the pressure sensor 9 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 9 by 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 jumping device), and is output from the pressure sensor 9. 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.

  When a pedestrian or the like collides with the bumper 2 of the vehicle, the part where the pedestrian collides presses the chamber member 7 via the bumper cover 3, and the pressed portion is deformed and crushed. When the chamber member 7 is deformed and crushed, the pressure in the chamber space 7a of the chamber member 7 changes. And the pressure sensor 9 detects the pressure in the chamber space 7a, and transmits a pressure signal to the pedestrian protection apparatus ECU10. The pedestrian protection device ECU 10 executes processing for determining whether or not a pedestrian has collided based on a signal from the pressure sensor 9.

(Mounting form of chamber member to bumper reinforcement)
A plurality of plate-like attachment portions 8 having attachment holes 14 are provided on the side surface of the chamber member 7 so as to be flush with the surface of the chamber member 7 that contacts the bumper reinforcement 4. As shown in FIG. 3, each attachment portion 8 is fixed to the bumper reinforcement 4 by inserting a fastener such as a clip 11 or a bolt through the attachment hole 14.

  As shown in FIG. 4, the other attachment forms are provided at the vehicle front side corner of the bumper reinforcement 4 and the engagement portion 13 formed by bending and extending the attachment portion 8 in a U shape from the tip thereof. It engages with a protruding portion 12 such as a rib. The protrusions 12 may be provided not on the vehicle front side corner of the bumper reinforcement 4 but on the side surface or the lower side of the bumper reinforcement 4.

  Next, a first embodiment to a sixth embodiment relating to a form of forming the attachment portion 8 will be described based on FIGS. 5, 7, 9, 10, 12, and 14. However, in each drawing excluding FIG. 10, for convenience, the attachment portion 8 is provided only on one side surface of the chamber member 7. However, the attachment portion 8 may be provided on the other side surface of the chamber member 7. it can. Further, the attachment position and the number of attachments of the attachment portion 8 can be arbitrarily set according to the surface shape of the attachment surface 4a to which the chamber member 7 of the bumper reinforcement 4 is attached.

(First embodiment)
As shown in FIG. 5, the attachment piece 8 a represented by a two-dot chain line is integrally extruded together with the chamber member 7 and is formed as a part of a molded product having a T-shaped cross section. The extruded part mounting part 8a of the molded product is cut out together with the mounting hole 14, and the chamber member 7 having the mounting part 8 as shown in FIG. 6 is manufactured. When the engagement portion 13 (shown in FIG. 4) is provided in the attachment portion 8, the attachment hole 14 is not drilled.

(Second embodiment)
The molded product shown in FIG. 7 is a material of a portion of the chamber member 7 that does not abut against the bumper reinforcement 4 of the chamber member 7, and either one or both of the portion that contacts the bumper reinforcement 4 of the chamber member 7 and the attachment piece 8 a. Extrusion-molded with other materials having higher rigidity than This molding can be performed by a two-color extrusion molding machine in which two types of molding raw materials are simultaneously supplied to one die and extruded. As in the first embodiment, in this molded product, the attachment portion 8a is cut together with the attachment hole 14, and the chamber member 7 having the attachment portion 8 as shown in FIG. 8 is manufactured. In FIG. 8, both the portion of the chamber member 7 that contacts the bumper reinforcement 4 and the attachment piece 8 a are higher than the material of the portion of the chamber member 7 that does not contact the bumper reinforcement 4. The example extruded with the other material used as rigidity is shown.

(Third embodiment)
The mounting portion 8 shown in FIG. 9 is manufactured separately from the chamber member 7 and made of the same or other material as the chamber member 7. Regarding the means for fixing the mounting portion 8 to the chamber member 7, vulcanization adhesion is used when both are rubber, and welding is performed when both are elastomers. Moreover, when both materials differ from each other, an appropriate adhesive may be used.

(Fourth embodiment)
As shown in FIGS. 10 and 11, the claw member of the bracket 15 is engaged with the mounting portion 8 protruding from the chamber member 7. The attachment means for attaching the bracket 15 to the attachment portion 8 may be not by engagement but by a fastener such as a clip or a bolt. The bracket 15 may be made of any material as long as it has sufficient rigidity.

(Fifth embodiment)
As shown in FIGS. 12 and 13, one or both of the thickness of the portion of the chamber member 7 that abuts against the bumper reinforcement 4 and the plate thickness of the mounting portion 8 is the bumper reinforcement 4 of the chamber member 7. It is set to be larger than the thickness of the portion that does not come into contact with. In FIG. 13, both the thickness of the portion of the chamber member 7 that contacts the bumper reinforcement 4 and the thickness of the mounting portion 8 of the portion of the chamber member 7 that does not contact the bumper reinforcement 4 are shown. The example comprised so that it might become larger than thickness was shown.

(Sixth embodiment)
As shown in FIGS. 14 and 15, a rib 16 is provided on one or both of the portion of the chamber member 7 that contacts the bumper reinforcement 4 and the mounting portion 8. The height and number of the ribs 16 can be appropriately set within a range in which the mounting portion 8 can obtain sufficient rigidity.

  As is clear from the above detailed description, according to the present embodiment, the chamber member 7 is disposed in contact with the bumper reinforcement 4 behind the bumper cover 3 and has a chamber space 7a formed therein. The vehicle collision detection device 1 includes a pressure sensor 9 that detects the pressure in the chamber space 7a, and is configured to detect a collision with the bumper cover 3 based on the detection result of the pressure sensor 9. An attachment portion 8 for fixing the chamber member 7 to the bumper reinforcement 4 is provided on the side surface of the chamber member 7 manufactured by the above.

  Thus, since the chamber member 7 is manufactured by extrusion molding, it is easily cut into the bumper reinforcement 4 which is cut according to different dimensions for each vehicle type of the bumper reinforcement 4 and bent or curved in a complicated manner. It can be arranged following the above. This eliminates the need for a molding die for each vehicle type that is required when the chamber member is manufactured by blow molding, thereby reducing the cost of the chamber member 7. In addition, since the chamber member 7 includes the mounting portion 8 on the side surface, the chamber member 7 can be easily and reliably fixed to the bumper reinforcement 4.

  Further, since the attachment portion 8 is fixed to the bumper reinforcement 4 by the fastener 11, the chamber member 7 can be fixed to the bumper reinforcement 4 easily and reliably.

  Moreover, since the attachment part 8 has the engaging part 13 engaged with the projection part 12 of the bumper reinforcement 4, the chamber member 7 can be fixed to the bumper reinforcement 4 easily and reliably.

  In addition, since the attachment portion 8 is integrally formed with the chamber member 7 and is formed by cutting away unnecessary portions, the attachment portion 8 can be formed very easily and the attachment with the chamber member 7 is extremely easy. Become strong.

  In addition, either one or both of the portion of the chamber member 7 that abuts against the bumper reinforcement 4 and the mounting portion 8 have higher rigidity than the material of the portion of the chamber member 7 that does not abut against the bumper reinforcement 4. It is molded with other materials. For this reason, the rigidity of the attachment portion 8 is extremely effectively increased, so that the chamber member 7 can be firmly and reliably fixed to the bumper reinforcement 4.

  Further, since the attachment portion 8 is manufactured separately from the chamber member 7 and bonded or welded to the chamber member 7, a suitable material can be easily selected as the attachment portion 8, and the attachment portion 8 can be effectively used. Can be formed.

  Moreover, since the bracket 15 manufactured separately from the chamber member 7 is attached to the attachment portion 8, the chamber member 7 can be firmly and securely fixed to the bumper reinforcement 4.

  Further, either one or both of the thickness of the portion of the chamber member 7 that contacts the bumper reinforcement 4 and the thickness of the mounting portion 8 are the thickness of the portion of the chamber member 7 that does not contact the bumper reinforcement 4. Greater than. Therefore, the rigidity of the attachment portion 8 can be further increased.

  In addition, a rib (16) is provided on one or both of the portion of the chamber member 7 that contacts the bumper reinforcement 4 and the mounting portion 8. Therefore, the rigidity of the attachment portion 8 can be further increased.

  Further, since the chamber member 7 is made of rubber or soft resin, it can be easily disposed following the curved or curved surface shape of the bumper reinforcement.

  In addition, this invention includes what can be implemented in the aspect which added various change, correction, improvement, etc. based on the knowledge of those skilled in the art. Further, it goes without saying that any of the embodiments to which the above-mentioned changes are added is included in the scope of the present invention without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Vehicle collision detection apparatus 3 Bumper cover 4 Bumper reinforcement 7 Chamber member 7a Chamber space 8 Mounting part 9 Pressure sensor 11 Clip (fastener)
12 Protruding part 13 Engaging part 15 Bracket 16 Rib

Claims (6)

A chamber member (7) disposed behind the bumper cover (3) in contact with the bumper reinforcement (4) and having a chamber space (7a) formed therein; and a pressure in the chamber space (7a) A vehicle collision detection device (1) configured to detect a collision with the bumper cover (3) based on a detection result of the pressure sensor (9). There,
A mounting portion (8) for protruding the side surface of the chamber member (7) for fixing the chamber member (7) to the bumper reinforcement (4);
A bracket (15) separate from the chamber member (7), which is attached to the attachment portion (8);
A vehicle collision detection device comprising: The vehicle collision detection device according to claim 1, wherein the attachment portion (8) is fixed to the bumper reinforcement (4) by a fastener (11). The vehicle collision according to claim 1 or 2 , wherein the attachment portion (8) has an engagement portion (13) that engages with a protrusion (12) of the bumper reinforcement (4). Detection device. One or both of the thickness of the portion of the chamber member (7) contacting the bumper reinforcement (4) and the plate thickness of the mounting portion (8) are the bumper rain of the chamber member (7). the vehicle collision detecting apparatus according to any one of claims 1 to 3, characterized in that greater than the thickness of the portion not in contact with the reinforcement (4). The rib (16) is provided in any one or both of the part which contact | abuts to the said bumper reinforcement (4) of the said chamber member (7), and the said attaching part (8). 4. The vehicle collision detection device according to any one of items 1 to 3 . The vehicle collision detection device according to any one of claims 1 to 5 , wherein the chamber member (7) is made of rubber or soft resin.

Images