JP6432730B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a front structure of a vehicle, and relates to a technique for improving pedestrian safety at the time of a collision.

  A front bumper is provided at a front portion of a vehicle such as a passenger car in order to absorb an impact. The front bumper has, for example, a bumper beam (bumper reinforcement) that extends in the left-right direction that connects the front ends of a pair of left and right side members of the vehicle, and a foam material in front of the bumper beam. When a large impact is absorbed, the bumper beam is bent to absorb the impact.

  Furthermore, in recent years, various methods for improving the safety of pedestrians when colliding with pedestrians have been implemented. For example, in Patent Document 1, a lower core member (protruding member) extending in the left-right direction of the vehicle is provided below the bumper beam so that the pedestrian's legs are not caught between the front bumper and the ground by the member. The technology to make is disclosed.

Japanese Patent No. 3740901

  However, as in Patent Document 1, when the lower core member extending in the vehicle left-right direction is provided below the bumper beam in the vehicle, the front end surface of the front bumper and the lower core member are leg portions of the pedestrian at the time of collision with the pedestrian. Therefore, the lower core member must have a sufficient shock absorbing function. Therefore, the size of the lower core member is increased, the entire front bumper is increased in size, and the parts cost and weight are increased.

Further, in Patent Document 1, since the lower core member is disposed so as to extend in the left-right direction of the vehicle below the bumper beam, the lower core member is used in a vehicle in which a cooling system component such as an intercooler is provided below the bumper beam. As a result, the traveling wind is interrupted and the cooling efficiency of the cooling system components is reduced.
SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle front structure that prevents a pedestrian's legs from getting involved in a collision with a compact configuration.

The front structure of the vehicle according to claim 1 is fixed to a front surface of the bumper beam extending in front of the pair of left and right side members of the vehicle in the left-right direction of the vehicle, and is deformed when a collision load is applied. A shock absorbing member that absorbs collision energy, an intrusion prevention member that is provided below the vehicle at the front end of the side member, and prevents the pedestrian's leg from entering the rear of the vehicle, and the pair of left and right side members and a cooling device for cooling by introducing a running wind into the vehicle under the shock absorbing member between said intrusion prevention member is disposed rearward of a front end portion of the shock absorbing member, the vehicle front together with is arranged in front of the vehicle than the front surface position of the bumper beam when the impact absorbing member is crushed by an impact, to be placed only on the vehicle below the pair of right and left side members And butterflies.

The vehicle front structure according to claim 2 is the vehicle front structure according to claim 1, wherein the intrusion prevention member is provided at a lower portion of an elastic member that extends downward from the front end of the side member and elastically moves rearward of the vehicle. It is characterized by .

According to a third aspect of the vehicle front structure of the present invention, in the first or second aspect , the intrusion prevention member detects an obstacle in front of the vehicle in which a detection surface formed on a flat surface faces the front of the vehicle. It is the detection means to perform.

  According to the first aspect of the present invention, the leg portion of the pedestrian colliding with the vicinity of the side member is prevented from entering the rear of the vehicle below the side member by the intrusion prevention member. The intrusion prevention member is located in front of the front of the bumper beam when the shock absorbing member is crushed by an impact from the front of the vehicle. Since the pedestrian's leg contacts the intrusion prevention member before the pedestrian, even if the bumper beam is fixed to the side member and is difficult to move to the rear of the vehicle, the pedestrian's leg to the rear of the vehicle Intrusion can be prevented. In addition, since the intrusion prevention member is disposed behind the vehicle from the front end portion of the impact absorbing member, the impact is absorbed by the impact absorbing member at the beginning in the event of a collision with a pedestrian. There is no need to have it.

  When a pedestrian collides with a place other than the side member from the front of the vehicle, the impact absorbing member is deformed to absorb the collision energy and the bumper beam is deformed to further absorb the collision energy. It is possible to suppress such a movement that the part is caught rearward of the vehicle below the bumper beam. Accordingly, it is possible to prevent the pedestrian's leg from being caught at the time of a collision without providing an intrusion prevention member other than below the side member of the vehicle.

As described above, the intrusion prevention member can be reduced in size, and the pedestrian's leg can be prevented from being involved in a collision with a compact configuration.
Further, since the cooling device is provided below the vehicle of the shock absorbing member between the pair of side members, and the intrusion prevention member is disposed only below the vehicle of the pair of side members, the traveling airflow to the cooling device by the intrusion prevention member. Therefore, the cooling efficiency of the cooling device can be improved.
According to the invention of claim 2, since the intrusion prevention member is provided at the lower part of the elastic member extending downward from the front end of the side member, even if the pedestrian's leg strongly contacts the intrusion prevention member due to a strong collision. The leg can be protected.

According to the invention 請 Motomeko 3, it is possible to a detection surface which is formed in a plane which is disposed toward the front of the vehicle, by using a detection means for detecting a vehicle ahead of the obstacle provided intrusion prevention member, The number of parts can be reduced to reduce weight and cost.

1 is a perspective view showing a schematic internal structure of a front portion of a vehicle according to an embodiment of the present invention. It is a side view showing a schematic internal structure of a front part of a vehicle concerning this embodiment. It is a front view showing a schematic internal structure of a front part of a vehicle concerning this embodiment. It is a side view which shows the internal state of the front part of the vehicle at the time of the collision in the vicinity of a side member.

Hereinafter, the present invention will be described based on an embodiment shown in the drawings.
FIG. 1 is a perspective view showing a schematic internal structure of a front portion of a vehicle 1 according to an embodiment of the present invention. FIG. 2 is a side view showing a schematic internal structure of the front portion of the vehicle 1 according to the present embodiment. FIG. 3 is a front view showing a schematic internal structure of the front portion of the vehicle 1 according to the present embodiment.
As shown in FIGS. 1-3, the vehicle 1 which concerns on one Embodiment of this invention is equipped with a pair of side member 2 which is mutually spaced apart in the vehicle left-right (vehicle width) direction as a frame | skeleton member, and extends in a vehicle front-back direction. Yes. An upper core 3 is provided at the tip of the side member 2. The upper core 3 is a member that extends in the vehicle left-right direction at the upper part of the side member 2, and its left and right end portions are bent downward in the vehicle, and its lower end portion is fixed to the inner side surface of the side member 2.

  In addition, the side member 2 is provided with a front side upper member 4 extending upward and behind the vehicle at a distance from the upper core 3 and a front side lower member 5 extending downward of the vehicle. The upper end portions of the front side upper member 4 are connected to each other by a front end upper member 6 extending in the left-right direction of the vehicle and constitute a part of the body. The front side lower member 5 extends obliquely forward and downward from the side member 2, and a front end portion of a subframe connected to a suspension member (not shown) is fixed to a lower end portion of the front side lower member 5.

  A bumper beam 10 extending in the left-right direction is provided at the front end of the side member 2. The bumper beam 10 is a trapezoid having a hollow cross section in the vertical direction, and the short side is located on the front side of the vehicle, and is disposed on the front side of the vehicle from the front end of the side member 2. The bumper beam 10 connects the front ends of the left and right side members 2 at the same vehicle vertical position as the side members 2.

The bumper beam 10 and the upper core 3 are formed of a steel plate and have a function of absorbing collision energy by being crushed or bent when a collision load is applied.
The front bumper 11 of the vehicle 1 includes a bumper beam 10, a bumper face 12 that is located in front of the bumper beam 10, is exposed to the outside of the vehicle and becomes a part of the shaping on the front surface of the vehicle body, and the bumper beam 10 is between the bumper beam 10 and the bumper face 12. It is comprised by the impact-absorbing member 13 comprised with the foaming material extended in the vehicle width direction along the front surface, and the hollow sheet metal member.

A radiator 20 and an intercooler 21 (cooling device) are provided between the side members 2 at the front portion of the vehicle 1.
The radiator 20 is located behind the upper core 3 and is located above the side member 2. A surface 20 a that receives the traveling wind of the radiator 20 extends between the left and right side members 2 substantially in the vehicle left-right direction, and is disposed between the bumper beam 10 and the front end upper member 6.

The intercooler 21 is arranged below the radiator 20 in the vehicle front-rear direction position so as to be substantially the same. As for the intercooler 21, the surface 21 a that receives the traveling wind extends substantially between the left and right side members 2 in the left-right direction.
Furthermore, the vehicle 1 of this embodiment is provided with a known collision damage reducing brake device. Although a detailed description of the collision damage reducing brake device is omitted, in this embodiment, a radar transmitter / receiver 30 (detection means, intrusion prevention member) is provided at the front of the vehicle to detect a distance from a front obstacle such as a forward vehicle. Then, based on the inter-vehicle distance, relative speed, etc., processing such as warning to the driver, assisting in brake operation force, automatic brake operation, etc.

  A radar transmitter / receiver 30 serving as a front obstacle detection means is provided below the vehicle at the front end of the side member 2. A radar fixing bracket 31 (elastic member) extending from the front end of the side member 2 to the lower side of the vehicle is provided, and a radar transceiver 30 is fixed to the lower part of the radar fixing bracket 31. The radar transmitter / receiver 30 has a box shape and is arranged over at least the length of the side member 2 in the vehicle width direction with a flat transmission / reception surface 30a (detection surface) facing the front of the vehicle. The radar fixing bracket 31 can be elastically moved rearward of the vehicle with an elastic member such as a steel plate, and is set to have such a strength as to absorb an impact when the pedestrian's leg collides with the pedestrian. . Further, the radar transceiver 30 is arranged such that the transmission / reception surface 30a is disposed in front of the vehicle relative to the front end of the side member 2, and the shock absorbing member 13 is positioned in front of the front of the bumper beam 10 (front surface position). It is arrange | positioned back rather than the front-end part.

  In the vehicle 1 of the present embodiment, a radar fixing bracket 31 is provided at each of the front end portions of the left and right side members 2. Since at least one radar transceiver 30 is required on the front surface of the vehicle, one of the radar fixing brackets 31 includes the radar transceiver 30, and the other radar fixing bracket 31 has the same shape as the radar transceiver 30. For example, a resin dummy box (32) may be provided.

  With the configuration as described above, in the present invention, when the vehicle 1 collides with a pedestrian on the front surface, the impact absorbing member 13 of the front bumper 11 absorbs the collision energy in a slight collision. For example, when the vehicle traveling speed is high and a large impact is received, the bumper beam 10 bends toward the rear side of the vehicle after the impact absorbing member 13 is crushed and absorbs the impact. In particular, when the vehicle collides at the center in the left-right direction of the vehicle, the bumper beam 10 can be greatly bent, so that the impact can be absorbed significantly. Further, since the entire leg portion of the pedestrian moves to the rear of the vehicle due to the bending of the bumper beam 10 to the rear of the vehicle, it is possible to avoid the leg portion below the pedestrian's knee from being caught under the front bumper 11. .

  Since the side member 2 is a skeletal member, when a pedestrian or the like collides in the vicinity of the side member 2 on both sides of the vehicle in the left-right direction, the bumper beam 10 is crushed after the impact absorbing member 13 is crushed, but the backward movement is not performed. Since it is suppressed, there is a possibility that the leg part below the pedestrian's knee will move to the rear of the vehicle with the bumper beam 10 as a fulcrum. However, as shown in FIG. 4, in this embodiment, the radar transceiver 30 is disposed below the side member 2 in the vehicle, and the transmission / reception surface 30 a of the radar transceiver 30 is crushed at the time of a collision with a pedestrian. The bumper beam 10 is located in front of the front of the bumper beam 10 and is disposed over the length of the side member 2 in the vehicle width direction, so that the leg portion L of the pedestrian (particularly below the pedestrian's knee) is the bumper beam 10. Before contact with the vehicle, the radar transceiver 30 blocks the vehicle and prevents entry to the rear of the vehicle.

As a result, it is possible to prevent the leg L from being caught downward of the front bumper 11 with a compact configuration with a reduced number of parts. Further, by using the radar transceiver 30 as an intrusion prevention member in this way, the radar transceiver 30 can be disposed relatively in front of the vehicle, and the detection performance of the radar transceiver 30 can be improved. .
Further, since the transmission / reception surface 30a of the radar transmitter / receiver 30 is arranged behind the front end of the shock absorbing member 13, when a pedestrian collides near the side member 2, the leg portion L of the pedestrian starts. After contacting the shock absorbing member 13 and the collision energy is absorbed to some extent, the radar transmitter / receiver 30 is contacted. Thus, even if the radar transceiver 30 is relatively strong, the pedestrian's legs L are less likely to be injured, and the radar transceiver 30 itself does not need to have a strong shock absorbing function. Therefore, the present invention can be widely applied to vehicles equipped with various radar transceivers 30.

  The radar transmitter / receiver 30 is arranged so that the transmission / reception surface 30a is a flat surface and faces the front of the vehicle. Further, since the radar transceiver 30 is fixed by a radar fixing bracket 31 that is an elastic member that can move rearward of the vehicle, even if the pedestrian's leg L strongly collides with the radar transceiver 30, the leg L Injury can be suppressed.

  Further, by providing a structure for preventing the pedestrian's leg L from being caught under the side member 2, a member that prevents the wrapping by bending the bumper beam 10 between the left and right side members 2 as described above. Since there is no need to provide, there is no member that blocks the front surface of the intercooler 21. Therefore, a large surface 21a for receiving the traveling wind of the intercooler 21 can be secured, and the cooling efficiency can be improved.

  Thus, in the present embodiment, the radar transceiver 30 can be used to prevent the pedestrian's leg L from being caught under the side member 2 and extend in the left-right direction below the bumper beam 10 in the vehicle. It is not necessary to provide an additional entrainment prevention member. As a result, it is possible to suppress an increase in size of the front bumper 11 and a number of parts, thereby reducing costs and vehicle weight. Further, since it is not necessary to provide an entrainment preventing member extending in the left-right direction below the bumper beam 10, the cooling efficiency of the intercooler 21 provided below the bumper beam 10 can be improved.

The present invention is not limited to the above-described embodiment. For example, the intercooler 21 provided below the vehicle of the bumper beam 10 may be another cooling device such as an oil cooler.
The radar transceiver 30 provided below the side member 2 may be other detection devices such as a radar, a radar laser, a millimeter wave, an infrared ray, an ultrasonic wave, and a camera. Further, the radar transceiver 30 and the radar fixing bracket 31 can be changed to other structures, and any structure may be used as long as it prevents the pedestrian's legs from entering the rear of the vehicle below the side member 2.

  The present invention can be widely applied to vehicles including a bumper beam and an impact absorbing member between left and right side members.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Side member 10 Bumper beam 13 Impact absorbing member 21 Intercooler (cooling device)
30 Radar transceiver (detection means, intrusion prevention member)
30a Transmission / reception surface (detection surface)
31 Radar fixing bracket (elastic member)
32 Dummy box (intrusion prevention member)

Claims (3)

A bumper beam arranged to extend in the vehicle left-right direction in front of the pair of left and right side members of the vehicle;
An impact absorbing member that is fixed to the front surface of the bumper beam and absorbs collision energy by being deformed when a collision load is applied;
An intrusion prevention member that is provided below the vehicle at the front end of the side member and prevents the intrusion of the pedestrian's legs into the rear of the vehicle;
A cooling device that cools the vehicle by introducing running wind below the shock absorbing member between the pair of left and right side members ;
The intrusion prevention member, the disposed rearward of the front end of the impact absorbing member, as well as positioned in front of the vehicle than the front surface position of the bumper beam at the time of crushing the shock absorbing member by the impact from the vehicle front, A front structure of a vehicle, which is disposed only below the pair of left and right side members .   The vehicle front structure according to claim 1, wherein the intrusion prevention member is provided at a lower portion of an elastic member that extends downward from the front end portion of the side member and elastically moves rearward of the vehicle. 3. The vehicle according to claim 1, wherein the intrusion prevention member is a detection unit that detects an obstacle in front of the vehicle and is arranged with a detection surface formed in a plane facing the front of the vehicle. Front structure.

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