JP2010069978A - Collision detection device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collision detection device for a vehicle facilitating mounting while preventing dropping off and destroying of a pressure sensor. <P>SOLUTION: A pressure introduction port 94 for introducing a pressure in a chamber space 7a in the pressure sensor 9 is provided on an outer peripheral surface (front end surface 93) of a sensor body 91, and in the state that at least a part of the outer peripheral surface of the sensor body 91 including the pressure introduction port 94 is inserted from an opening part 72a into the chamber space 7a of the chamber member 7, the pressure sensor 9 is fixed to the opening part 72a. Therefore, the pressure in the chamber space 7a can be certainly introduced from the pressure introduction port 94 to a sensor element 93 stored at the inside of the sensor body 91. Further, the pressure in the chamber space 7a is detected by the sensor element 93 and collision to a vehicle bumper 2 can be detected based on the pressure detection result. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

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

Further, as a device for detecting a collision of a pedestrian or the like with a vehicle, for example, Japanese Patent Laid-Open No. 2006-117157 (Patent Document 1) discloses a chamber member in front of a bumper reinforcement in a vehicle bumper in order to detect a collision. Has been proposed, and a collision detection device for a vehicle configured to detect a collision of a pedestrian or the like with a vehicle bumper by detecting a pressure change in the chamber space with a pressure sensor is proposed.
JP 2006-117157 A

  Here, a configuration shown in FIG. 8 is conceivable as a pressure chamber type vehicle collision detection device. In the vehicle collision detection device 101 of the reference example shown in FIG. 8, a chamber member 107 is disposed in front of the bumper reinforcement 104 and above the absorber 106 in the vehicle bumper. Then, as shown in FIG. 8, a cylindrical tubular pressure introduction pipe 194 is extended from the end surface of the sensor main body 191 that houses a sensor element (not shown), and the pressure introduction pipe 194 is connected to the opening 172 a of the chamber member 107. By inserting, the pressure inside the chamber member 107 (chamber space 107a) is introduced into the pressure sensor 109.

  However, the pressure introduction pipe 194 having a small diameter and low strength may be dropped or destroyed due to a large impact at the time of collision or thermal expansion / contraction of the chamber member 107 having a large linear expansion coefficient. When the pressure introduction pipe 194 is dropped or destroyed, the pressure sensor 109 cannot accurately detect the pressure inside the chamber member 107, and the collision detection performance is deteriorated. Further, when the sensor main body 191 is fixed to the bumper reinforcement 104 by using a fixing member such as a bracket 115 and a screw 116, there is a problem that the number of parts increases and a man-hour is required for mounting.

  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 be easily attached while preventing a pressure sensor from dropping or breaking.

  Hereinafter, each means suitable for solving the above-described problems will be described with additional effects and the like as necessary.

1. A pressure sensor in which a sensor element for pressure detection is housed in a sensor body, and a chamber member disposed in front of a bumper reinforcement in a vehicle bumper and having a chamber space formed therein, In the vehicle collision detection device configured to detect a pressure in the chamber space by a pressure sensor and detect a collision with the vehicle bumper based on the pressure detection result,
The pressure sensor is provided with a pressure inlet for introducing pressure to the sensor element on the outer peripheral surface of the sensor body,
The chamber member is provided with an opening through which at least a part of the outer peripheral surface of the sensor main body can be inserted and communicated with the chamber space to the outside. At least a part of the outer peripheral surface of the sensor main body including the pressure introducing port is provided. A collision detection apparatus for a vehicle, wherein the pressure sensor is fixed to the opening while being inserted into the chamber space from the opening.

  According to the means 1, the pressure introduction port for introducing the pressure in the chamber space is provided on the outer peripheral surface of the sensor main body, and at least a part of the outer peripheral surface of the sensor main body including the pressure introduction port is passed through the opening from the chamber member Since the pressure sensor is fixed to the opening while being inserted into the space, the pressure in the chamber space is reliably introduced from the pressure inlet to the sensor element housed in the sensor body. The pressure in the chamber space is detected by the sensor element, and a collision with the vehicle bumper can be detected based on the pressure detection result.

  In addition, since the high-strength sensor body is immediately fixed to the opening of the chamber member, the pressure sensor may drop or break down due to a large impact at the time of collision or thermal expansion / contraction of the chamber member having a large linear expansion coefficient. Can be prevented. Furthermore, there is no need to fix the pressure sensor to a bumper reinforcement or the like via a fixing member, and the number of parts can be reduced and the assembly process can be simplified.

2. The chamber member has a tubular portion extending in a tubular shape from a chamber body forming the chamber space and having the opening formed at one end thereof.
The vehicle collision detection device according to claim 1, wherein the outer peripheral surface of the sensor body is press-fitted and fixed to the inner periphery of the tubular portion.

  According to the means 2, the chamber member has a tubular portion extending from the chamber main body forming the chamber space and having an opening formed at one end, and the outer peripheral surface of the sensor main body is press-fitted into the inner periphery of the tubular portion. Since it is fixed, the sensor body is firmly fixed to the opening of the chamber member without using a fixing member.

  3. The outer peripheral surface of the sensor body is formed in a tapered shape whose outer diameter increases from one side where the pressure introduction port is provided toward the other side, and the outer diameter at the one side is the opening of the chamber member. The vehicle collision detection device according to claim 2, wherein an outer diameter at the other side portion is formed to be larger than an inner diameter of the opening.

  According to the means 3, the outer peripheral surface of the sensor body is formed on a taper whose outer diameter increases from one side where the pressure inlet is provided toward the other side. And, since the outer diameter at one side is smaller than the inner diameter of the opening of the chamber member, at least a part of the outer peripheral surface of the sensor body including the pressure inlet is easily inserted into the chamber space from the opening of the tubular portion. Can do. Moreover, since the outer diameter in the other side part is formed larger than the inner diameter of the opening, the sensor main body is firmly fixed by pressing the outer peripheral surface of the sensor main body against the inner peripheral surface of the tubular portion.

  4). The vehicle collision detection device according to claim 2 or 3, wherein a stepped shape is provided on the outer peripheral surface of the sensor body.

  According to the means 4, since the stepped shape is provided on the outer peripheral surface of the sensor body, the sensor main body is inserted from the opening of the tubular portion and press-fitted so that the stepped shape tip portion bites into the inner peripheral surface of the tubular portion. As a result, the frictional force increases and the sensor body can be prevented from coming off.

5). A cylindrical member having a spring property on the inner periphery is integrally provided on the inner periphery of the opening of the chamber member,
The vehicle collision detection device according to claim 1, wherein the outer peripheral surface of the sensor body is fitted to the inner periphery of the cylindrical member.

  According to the means 5, the cylindrical member having the spring property on the inner periphery is integrally provided on the inner periphery of the opening of the chamber member, and the outer peripheral surface of the sensor body is fitted to the inner periphery of the cylindrical member. The outer peripheral surface of the sensor body is firmly held and fixed by the spring force of the inner periphery.

  6). 6. The vehicle collision detection device according to claim 5, wherein an engagement structure is provided between the inner periphery of the cylindrical member and the outer peripheral surface of the sensor body.

  According to the means 6, the sensor main body can be prevented from coming off by the engagement structure provided between the inner periphery of the cylindrical portion and the outer peripheral surface of the sensor main body.

7). The chamber member has a tubular portion extending in a tubular shape from a chamber body forming the chamber space and having the opening formed at one end thereof.
The pressure sensor is provided with an outer cylindrical portion that forms an outer peripheral groove between the pressure sensor and the outer peripheral surface of the sensor body, and is fixed to the tubular portion via the outer cylindrical portion in a state where the tubular portion is inserted into the outer peripheral groove. 2. The vehicle collision detection device according to claim 1, wherein the vehicle collision detection device is provided.

  According to the means 7, the chamber member has a tubular portion that extends in a tubular shape from the chamber main body forming the chamber space and has an opening formed at one end thereof, and the pressure sensor is disposed between the outer peripheral surface of the sensor main body and the pressure sensor. Since the outer cylinder part which forms an outer periphery groove | channel is provided, it fixes to a tubular part via an outer cylinder part in the state which inserted the tubular part extended from the chamber main body of the chamber member in the outer periphery groove | channel.

  8). 8. A vehicle collision detection device according to claim 7, wherein an engagement structure is provided between the outer periphery of the outer cylinder part and the outer periphery of the tubular part.

  According to the means 8, the sensor body can be prevented from coming off by the engagement structure provided between the inner periphery of the outer cylinder portion and the outer periphery of the tubular portion of the sensor body.

  9. The engagement structure includes a cylindrical locked member integrally provided on the outer periphery of the tubular portion, and a locking groove portion that is formed on the inner periphery of the outer cylinder portion and locks the locked member. The vehicle collision detection device according to claim 8, wherein the vehicle collision detection device is configured.

  According to the means 9, the cylindrical locked member integrally provided on the outer periphery of the tubular portion and the locking groove portion formed on the inner periphery of the outer tube portion are combined to prevent the sensor body from coming off. Can be planned.

  10. 8. The vehicle collision detection device according to claim 7, wherein the outer cylinder portion is fixed to the tubular portion via a fixing member.

  According to the means 10, the sensor main body can be reliably prevented from coming off by fixing the outer cylinder portion of the sensor main body to the tubular portion using the fixing member.

  11. The fixing member includes a female screw member integrally provided on an outer periphery of the tubular portion, and a male screw member fastened to the female screw member via the outer tube portion. The vehicle collision detection device according to claim 1.

  According to the means 11, the sensor main body can be securely prevented from coming off with a simple structure by fastening the male screw member to the female screw member integrally provided on the outer periphery of the tubular portion via the outer cylinder portion. Can do.

  Hereinafter, embodiments embodying the vehicle collision detection device of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram showing the vehicle collision detection apparatus 1 according to the first embodiment of the present invention in a plan view. FIG. 2 is a cross-sectional view of the main part of the vehicle collision detection device 1 as viewed from the side. FIG. 3 is a cross-sectional view of the pressure sensor 9 attached to the tubular portion 72 as viewed from the side.

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

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

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

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

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

  The absorber 6 is a foamed resin member that extends in the vehicle width direction and is attached to the lower side of the 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 hollow member made of synthetic resin such as substantially box-like polyethylene extending in the vehicle width direction and attached to the upper side of the bumper reinforcement front surface 4a in the bumper cover 3. More specifically, the chamber member 7 includes a chamber main body 71 and a tubular portion 72.

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

  The tubular portion 72 is a portion to which the pressure sensor 9 is fixed, and extends in a tubular shape from the upper rear end surface at the center in the vehicle width direction of the chamber body 71 toward the rear. An opening 72 a that allows the chamber space 7 a to communicate with the outside is formed at the distal end of the tubular portion 72.

  The pressure sensor 9 is a sensor device capable of detecting gas pressure, and includes a sensor main body 91, a connector 92 to which the signal line 10a is connected, and a sensor element 93 for pressure detection.

  The sensor main body 91 is a resin-made casing that accommodates a sensor element 93 for pressure detection therein, and has an overall shape of a truncated cone.

  Specifically, as shown in FIG. 3, the outer peripheral surface of the sensor main body 91 is formed in a tapered shape whose outer diameter increases from the front end surface 95 where the pressure introduction port 94 opens toward the rear end surface 96. The outer diameter φB at the front end surface 95 is smaller than the inner diameter φA of the tubular portion 72 (opening 72a) of the chamber member 7, and the outer diameter φC at the rear end surface 96 is the inner diameter of the tubular portion 72 (opening 72a). It is set larger than φA.

  When the sensor body 91 is inserted into the inner periphery of the tubular portion 72 from the opening 72a so that the front end surface 95 where the pressure introduction port 94 opens is directed toward the chamber space 7a, the sensor body 91 is placed on the inner peripheral surface of the tubular portion 72. The outer peripheral surface 91 is fixed in pressure contact. That is, the sensor main body 91 is in a state of closing the opening 8 by the outer diameter φC larger than the inner diameter φA of the opening 72a. Accordingly, the gas pressure in the chamber space 7 a is introduced into the sensor element 93 in the sensor body 91 via the pressure inlet 94. The sensor element 93 outputs a voltage signal proportional to the pressure, and transmits a signal to the pedestrian protection apparatus ECU 10 via the signal line 10 a connected to the connector 92.

  The pedestrian protection device ECU10 is connected to the pressure sensor 9 and is disposed on the vehicle body. This is an electronic control device for performing activation control of a pedestrian protection device (not shown) (for example, a known pedestrian protection airbag or hood flip-up device), and a signal output from the pressure sensor 9 is connected to the signal line 10a. It is comprised so that it may be input via. The pedestrian protection device ECU 10 executes a process for determining whether or not a pedestrian (that is, a human body) has collided with the vehicle bumper 2 based on the pressure detection result of the pressure sensor 9.

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

  When a pedestrian collides with the bumper of the vehicle, the pedestrian presses the vehicle bumper 2, presses the chamber member 7 through the bumper cover 3, and the pressed portion of the chamber member 7 is deformed and crushed. Due to the deformation of the chamber member 7, the gas pressure in the chamber space 7a increases. This increase in pressure is detected by the pressure sensor 9 via the pressure inlet 94, and an output signal is sent to the pedestrian protection device ECU 10 via the signal line 10a and walks to the vehicle bumper 2 based on the pressure detection result. A process of determining whether or not a person (that is, a human body) has collided is executed.

  As is clear from the above detailed description, according to the present embodiment, the pressure introduction port 94 for introducing the pressure in the chamber space 7a in the pressure sensor 9 is provided on the outer peripheral surface (front end surface 93) of the sensor body 91. Since the pressure sensor 9 is fixed to the opening 72a in a state where at least a part of the outer peripheral surface of the sensor body 91 including the pressure introduction port 94 is inserted into the chamber space 7a of the chamber member 7 from the opening 72a. The pressure in the chamber space 7a is reliably introduced from the pressure introduction port 94 to the sensor element 93 accommodated in the sensor body 91. Then, the pressure in the chamber space 7a is detected by the sensor element 93, and a collision with the vehicle bumper 2 can be detected based on the pressure detection result.

  Further, since the high-strength sensor main body 91 is directly fixed to the opening 72a of the chamber member 7, the pressure sensor 9 is caused by a large impact at the time of collision or thermal expansion / contraction of the chamber member 7 having a large linear expansion coefficient. Can be prevented from falling off or being destroyed. Furthermore, there is no need to fix the pressure sensor 9 to the bumper reinforcement 4 via a fixing member, and the number of parts can be reduced and the assembly process can be simplified.

  In particular, the chamber member 7 has a tubular portion 72 that extends in a tubular shape from a chamber main body 71 that forms the chamber space 7 a and has an opening 72 a formed at one end, and the outer peripheral surface of the sensor main body 91 is the inside of the tubular portion 72. Since the periphery is press-fitted and fixed, the sensor main body 91 is firmly fixed to the opening 72 a of the chamber member 7 without using a fixing member.

  Furthermore, the outer peripheral surface of the sensor body 91 is formed in a tapered shape whose outer diameter increases from one side portion (front end surface 95) where the pressure introduction port 94 is provided toward the other side portion (rear end surface 96). Since the outer diameter φB at one side (front end surface 95) is smaller than the inner diameter φA of the opening 72a of the chamber member 7, at least a part of the outer peripheral surface of the sensor body 91 including the pressure inlet 94 is It can be easily inserted into the chamber space 7a from the opening 72a. Further, since the outer diameter φC at the other side (rear end surface 96) is formed larger than the inner diameter φA of the opening 72a, the outer peripheral surface of the sensor main body 91 is in pressure contact with the inner peripheral surface of the tubular portion 72. 91 is firmly fixed.

  Next, a modification of the first embodiment described above will be described with reference to FIG. FIG. 4 is a cross-sectional view of a state in which the pressure sensor 9 is attached to the tubular portion 72 in a modification of the first embodiment, as viewed from the side.

  This modification is characterized in that a stepped shape 97 is provided on the outer peripheral surface of the sensor body 91 (tapered surface between the front end surface 95 and the rear end surface 96).

  According to the present modification, the sensor main body 91 is inserted through the opening 72a of the tubular portion 72 and press-fitted, and the tip portion of the stepped shape 97 bites into the inner peripheral surface of the tubular portion 72, thereby increasing the frictional force. It is possible to prevent the main body 91 from coming off.

  Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment mentioned above, and the detailed description about them is abbreviate | omitted (same also in the following modification and embodiment). Here, FIG. 5A is a cross-sectional view of the pressure sensor 9 according to the second embodiment attached to the tubular portion 72 from the side, and FIG. 5B shows the sensor main body 91, the cylindrical member 11, and the like. It is a figure which shows the engagement state.

  As shown in FIGS. 5 (a) and 5 (b), a hard member having a spring property for fixing the sensor main body 91, for example, one side portion 11a of the metal cylindrical member 11 is formed on the inner periphery of the opening 72a. Insert molding is performed on the inner periphery of the opening 72a. Insert molding is one of injection molding methods, and an integrated part can be formed by installing a cylindrical member 11 as an insert part in a mold and injecting resin. Different members of the opening 72a of the chamber member 7 that is a soft resin and the cylindrical member 11 that is a hard member can be combined by insert molding. As shown in FIG. 5 (b), the cylindrical member 11 has a cross-section formed in a pine needle shape by one side portion 11a and the other side portion 11b, and the one side portion 11a is disposed outside the other side portion 11b. ing. On the outer peripheral surface of the sensor main body 91, a protrusion 9a is provided for engaging with the cylindrical member 11 having a spring property on the inner periphery.

  That is, one side portion 11a of the cylindrical member 11 is fixed to the inner periphery of the opening 72a by insert molding, and the other side portion 11b is a member for engaging the protrusion 9a on the outer peripheral surface of the sensor body 91. A joint hole 11c is provided. When the sensor main body 91 is inserted and pushed into the opening 72a, the outer periphery of the sensor main body 91 is pressed by the spring property while being in contact with the other side 11b of the cylindrical member 11, and the other side 11b is bent toward the one side 11a. The sensor body 91 is in pressure contact. The protrusion 9 a on the outer peripheral surface of the sensor main body 91 engages with the engagement hole 11 c on the other side 11 b of the cylindrical member 11, and the outer peripheral surface of the sensor main body 91 is fitted to the inner periphery of the cylindrical member 11.

  According to this embodiment, the cylindrical member 11 having the spring property on the inner periphery is integrally provided on the inner periphery of the opening 72 a of the chamber member 7, and the outer peripheral surface of the sensor body 91 is fitted to the inner periphery of the cylindrical member 11. Therefore, the outer peripheral surface of the sensor main body 91 is firmly held and fixed by the spring force of the inner periphery of the cylindrical member 11. Further, the sensor main body 91 can be prevented from coming off by the engagement structure provided between the inner periphery of the cylindrical portion 11 and the outer peripheral surface of the sensor main body 91.

  Next, a third embodiment of the present invention will be described with reference to FIG. Here, FIG. 6 is a sectional view of the pressure sensor 9 attached to the tubular portion 72 in the third embodiment as seen from the side.

  A cylindrical locked member 12 that is insert-molded integrally with the tubular portion 72 is disposed on the outer periphery of the tubular portion 72 that extends in a tubular shape from the chamber main body 71 and has an opening 72a. The sensor main body 91 has a locking groove portion 98c between the outer periphery of the sensor main body 91 and the outer cylinder portion 98, and the locking groove portion 98c is a member to be locked which is insert-molded integrally with the tubular portion 72. The tubular portion 72 is accommodated in the locking groove portion 98c.

  When the sensor main body 91 is inserted from the opening 72 a into the inner periphery of the tubular portion 72, the locked member 12 is pushed into the outer peripheral port 98 b and the outer peripheral port 98 b is expanded by the locked member 12. The locked member 12 passes through the outer peripheral groove 98a, and the locked member 12 is accommodated in the locking groove portion 98c. When housed in the locking groove 98c, the outer peripheral opening 98b returns to the state before being spread by the locked member 12, and acts to prevent the locked member 12 from coming off.

  That is, the locked member 12 is engaged with the locking groove portion 98c by the locking groove portion 98c provided on the inner periphery of the outer cylindrical portion 98 and the locked member 12 provided on the outer periphery of the tubular portion 72, The outer cylinder portion 98 of the sensor main body 91 covers the outer periphery of the opening 72a, and the locked member 12 prevents the locking groove portion 98c from coming off.

  According to the present embodiment, the chamber member 7 has a tubular portion 72 that is tubularly extended from the chamber main body 71 that forms the chamber space 7a and that has an opening 72a formed at one end thereof. Since the outer cylinder part 98 which forms an outer periphery groove | channel is provided between the main body 91 outer peripheral surfaces, an outer cylinder is inserted in the state which inserted the tubular part 72 extended from the chamber main body 71 of the chamber member 7 in the outer periphery groove | channel 98a. It is securely fixed to the tubular part 72 via the part 98.

  Further, the sensor main body 91 can be prevented from coming off by the engagement structure provided between the inner periphery of the outer cylindrical portion 98 of the sensor main body 91 and the outer periphery of the tubular portion 72. The cylindrical locked member 12 integrally provided on the outer periphery of the tubular portion 72 and the locking groove portion 98c formed on the inner periphery of the outer cylinder portion 98 are combined to prevent the sensor main body 91 from coming off. be able to.

  Furthermore, a modification of the above-described third embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view of a state in which the pressure sensor 9 according to the modification of the third embodiment is attached to the tubular portion 72 as viewed from the side.

  A plurality of female threaded portions 13 as fixing members are circumferentially provided by insert molding on the outer peripheral surface of the tubular section 72 extending from the chamber main body 71 and having an opening 72a formed therein. 14 can be tightened.

  The sensor main body 91 includes an outer cylindrical portion 99 having an outer peripheral groove 99a on the outer periphery, and a screw hole portion 100 is formed in the outer cylindrical portion 99 at a position where the female screw portion 13 is accommodated. The screw hole 100 is for inserting the male screw member 14.

  The outer peripheral groove 99 a of the sensor main body 91 accommodates the female screw portion 13 of the tubular portion 72 and is tightened with the male screw member 14 as a fixing member through the screw hole portion 100 of the outer cylinder portion 99. When the sensor main body 91 is inserted into the opening 72a and the female screw portion 13 is accommodated in the outer peripheral groove 99a, the outer cylindrical portion 99 of the sensor main body 91 is in a state of covering the opening 72a. Then, the male screw member 14 is inserted and tightened from the screw hole portion 100 of the outer cylinder portion 99 of the sensor main body 91, and the sensor main body 91 is fixed to the opening 72 a of the tubular portion 72.

  According to this modification, the sensor body 91 can be reliably prevented from coming off by fixing the outer cylinder portion 99 of the sensor body 91 to the tubular portion 72 using the fixing member. Further, the male screw member 14 is fastened to the female screw member 13 integrally provided on the outer periphery of the tubular portion 72 via the outer tube portion 99, so that the sensor main body 91 is reliably prevented from being detached with a simple configuration. be able to.

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

  For example, in the third embodiment shown in FIG. 6, a female screw hole is provided in the locked member 12, and a screw hole is formed in the outer tube portion 98 of the sensor main body 91 so as to be fastened and fixed with a male screw. Good. Also with this configuration, the sensor main body 91 can be reliably prevented from coming off.

It is a whole lineblock diagram showing the collision detection device for vehicles of a 1st embodiment by plane view. It is principal part sectional drawing seen from the side of the collision detection apparatus for vehicles of 1st Embodiment. It is sectional drawing which looked at the attachment state to the tubular part 72 of the pressure sensor 9 of 1st Embodiment from the side. It is sectional drawing which looked at the attachment state to the tubular part 72 of the pressure sensor 9 of the modification of 1st Embodiment from the side. (A) is sectional drawing which looked at the attachment state to the tubular part 72 of the pressure sensor 9 of 2nd Embodiment from the side, (b) is a figure which shows the engagement state of the sensor main body 91 and the cylindrical member 11. FIG. is there. It is sectional drawing which looked at the attachment state to the tubular part 72 of the pressure sensor 9 of 3rd Embodiment from the side. It is sectional drawing which looked at the attachment state to the tubular part 72 of the pressure sensor 9 of the modification of 3rd Embodiment from the side. (A) is a side view which shows the collision detection apparatus for vehicles of a reference example, (b) is principal part sectional drawing which looked at the attachment part of the pressure sensor from the front.

Explanation of symbols

1: Vehicle collision detection device 2: Vehicle bumper 3: Bumper cover 4: Bumper reinforcement 4a: Bumper reinforcement front 5: Side member 6: Absorber 7: Chamber member 71: Chamber body 7a: Chamber space 72: Tubular Part 72a: Opening part 9: Pressure sensor 91: Sensor main body 92: Connector 93: Sensor element 94: Pressure inlet 95: Front end face 96: Rear end face 9a: Projection part 97: Stepped shape 98: Outer cylinder part 98a: Outer circumference Groove 98b: Outer peripheral port 98c: Locking groove
99: Outer cylinder part 99a: Outer peripheral groove 100: Screw hole part 10: Pedestrian protection device ECU
11: Cylindrical member 11a: One side part 11b: The other side part 11c: Engagement hole 12: Locked member 13: Female screw part 14: Male screw member φA: Inner diameter φB: Outer diameter φC: Outer diameter 101: Reference example 104: bumper reinforcement 106: absorber 107: chamber member 107a: chamber space 109: pressure sensor 115: bracket 116: screw 172a: opening 191: sensor main body 194: pressure introduction pipe

Claims (11)

A pressure sensor in which a sensor element for pressure detection is housed in a sensor body, and a chamber member disposed in front of a bumper reinforcement in a vehicle bumper and having a chamber space formed therein, In the vehicle collision detection device configured to detect a pressure in the chamber space by a pressure sensor and detect a collision with the vehicle bumper based on the pressure detection result,
The pressure sensor is provided with a pressure inlet for introducing pressure to the sensor element on the outer peripheral surface of the sensor body,
The chamber member is provided with an opening through which at least a part of the outer peripheral surface of the sensor main body can be inserted and communicated with the chamber space to the outside. At least a part of the outer peripheral surface of the sensor main body including the pressure introducing port is provided. A collision detection apparatus for a vehicle, wherein the pressure sensor is fixed to the opening while being inserted into the chamber space from the opening. The chamber member has a tubular portion extending in a tubular shape from a chamber body forming the chamber space and having the opening formed at one end thereof.
The vehicle collision detection device according to claim 1, wherein the outer peripheral surface of the sensor body is press-fitted and fixed to the inner periphery of the tubular portion.   The outer peripheral surface of the sensor body is formed in a tapered shape whose outer diameter increases from one side where the pressure introduction port is provided toward the other side, and the outer diameter at the one side is the opening of the chamber member. The vehicle collision detection device according to claim 2, wherein an outer diameter at the other side portion is larger than an inner diameter of the opening portion.   The collision detection device for a vehicle according to claim 2 or 3, wherein a stepped shape is provided on the outer peripheral surface of the sensor body. A cylindrical member having a spring property on the inner periphery is integrally provided on the inner periphery of the opening of the chamber member,
The vehicle collision detection device according to claim 1, wherein an outer peripheral surface of the sensor body is fitted to an inner periphery of the cylindrical member.   The vehicle collision detection device according to claim 5, wherein an engagement structure is provided between an inner periphery of the cylindrical member and an outer peripheral surface of the sensor body. The chamber member has a tubular portion extending in a tubular shape from a chamber body forming the chamber space and having the opening formed at one end thereof.
The pressure sensor is provided with an outer cylindrical portion that forms an outer peripheral groove between the pressure sensor and the outer peripheral surface of the sensor body, and is fixed to the tubular portion via the outer cylindrical portion in a state where the tubular portion is inserted into the outer peripheral groove. The vehicle collision detection device according to claim 1, wherein the vehicle collision detection device is provided.   The vehicle collision detection device according to claim 7, wherein an engagement structure is provided between an inner periphery of the outer tube portion and an outer periphery of the tubular portion.   The engagement structure includes a cylindrical locked member integrally provided on the outer periphery of the tubular portion, and a locking groove portion that is formed on the inner periphery of the outer cylinder portion and locks the locked member. The vehicle collision detection device according to claim 8, wherein the vehicle collision detection device is configured.   The vehicle collision detection device according to claim 7, wherein the outer cylinder portion is fixed to the tubular portion via a fixing member.   The said fixing member consists of a female screw member provided integrally on the outer periphery of the tubular portion, and a male screw member fastened to the female screw member via the outer cylinder portion. The vehicle collision detection device according to claim 10.

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