JP2020131733A - Vehicle body front part structure - Google Patents

Abstract

To make compatible reduction of damages to an object to be collided at the time of front side collision without impairing the performance of protecting a pedestrian.SOLUTION: A vehicle body front part structure of a frame vehicle equipped with a pair of left and right side members 2 extended in a vehicle longitudinal direction with an interval therebetween in a vehicle width direction, comprises: pressure receiving members 10 arranged closer to a front side than the side members 2 and fixed to front end parts of the side members 2 to receive loads from the front side; and absorbing members 20 arranged closer to the front side than the pressure receiving members 10 to absorb loads. The pressure receiving members 10 include: upper pressure receiving members 11 extending obliquely upward from first fixed parts 11b to the side members 2 and having lower surfaces 11a to which loads are inputted; and lower pressure receiving members 12 arranged lower than the upper pressure receiving members 11 and extending obliquely downward from second fixed parts 12b to the side members 2 toward a front side, and having upper surface 12a to which loads are inputted.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle body front structure of a frame vehicle.

A frame vehicle is a vehicle that adopts a separate frame structure in which the frame and body are separated, and the body such as the passenger compartment or loading platform is placed on the frame via a mount for vibration damping (vibration control). It is composed. As shown in Patent Document 1, for example, the frame is formed between a pair of left and right side frames (also referred to as a main frame and a side member) extending along the vehicle front-rear direction and a side frame extending in the vehicle width direction. It is constructed in a ladder shape by a plurality of cross members that are connected. The front end portion of the side frame of Patent Document 1 is provided with a shock absorbing portion that absorbs a shock by being deformed at the time of a frontal collision.

JP-A-2016-112912

By the way, unlike the monocoque vehicle, the frame vehicle does not have a structure arranged below the front end portion of the side frame in order to secure the approach angle. Therefore, at the time of a frontal collision of the vehicle, only the front end portion of the side frame often hits the collision target, and there is a problem that the deformation of the collision target tends to be large.

As one method for solving such a problem, for example, it is conceivable to arrange a rigid body that receives a load from the front so that the deformation of the collision target does not become too large, after securing an approach angle, in front of the vehicle. However, it is difficult to reduce the damage of the collision target by simply arranging the rigid body at a position where the approach angle can be secured, and when the vehicle collides with a pedestrian, the pedestrian cannot be sufficiently protected. There is.

The front structure of the vehicle body of this case was devised in view of such a problem, and one of the purposes is to reduce the damage of the collision target at the time of a frontal collision without impairing the pedestrian protection performance. Not limited to this purpose, it is also an action and effect derived by each configuration shown in the embodiment for carrying out the invention described later, and it is also an action and effect that cannot be obtained by the conventional technique for another purpose of this case. is there.

(1) The vehicle body front structure disclosed here is a vehicle body front structure of a frame vehicle having a pair of left and right side members extending in the vehicle front-rear direction at intervals in the vehicle width direction, and the side thereof. A pressure receiving member that is arranged in front of the vehicle and fixed to the front end of the side member to receive the load from the front of the vehicle and is arranged in front of the vehicle from the pressure receiving member to absorb the load. It is provided with an absorbing member. The pressure receiving member includes an upper pressure receiving member that extends diagonally upward from the first fixing portion to the side member and has a lower surface into which the load is input, and is arranged below the upper pressure receiving member. A lower pressure receiving member that extends diagonally downward from the second fixing portion to the side member toward the front of the vehicle and has an upper surface into which the load is input is included.

(2) In the vehicle body front structure, it is preferable that the vehicle front-rear direction position of the first fixing portion and the vehicle front-rear direction position of the second fixing portion are the same. In this case, it is preferable that the pressure receiving member includes an intermediate pressure receiving member that connects the first fixing portion and the second fixing portion and has a front surface that faces the front of the vehicle and receives the load.

(3) The pressure receiving member is an integral body having the upper pressure receiving member, the intermediate pressure receiving member, and the lower pressure receiving member, and it is preferable that the lower surface, the front surface, and the upper surface are all flat. ..
(4) The pressure receiving member is preferably extended in the vehicle width direction so as to connect the pair of left and right side members. In this case, it is preferable that the absorbing member is provided along the pressure receiving member.

(5) It is preferable that the vehicle body structure includes a stopper member arranged behind the vehicle of the pressure receiving member. In this case, it is preferable that the stopper member receives the upper pressure receiving member and the lower pressure receiving member so that the lower surface and the upper surface face the front of the vehicle when the load is input to the lower surface and the upper surface.

(6) It is preferable that the vehicle body front structure includes a holding member that is arranged between the pressure receiving member and the absorbing member and is fixed to the front end of the side member to hold the absorbing member. ..
(7) The holding member is formed in a hollow shape, and it is preferable to transmit the load so as to push up the lower surface and push down the upper surface when deformed by the load.

According to the disclosed vehicle body front structure, when the vehicle collides in front, the absorbing member arranged in front of the pressure receiving member is compressed and deformed to absorb the load from the front and the pressure receiving member opens up and down. As a result, the load from the front is received, so that damage reduction of the collision target can be achieved at the same time without impairing the pedestrian protection performance.

It is a schematic diagram which shows the frame vehicle to which the vehicle body front structure which concerns on embodiment is applied. It is a schematic side view which shows the front part structure of the vehicle body of FIG. It is a schematic perspective view which shows the front part structure of the vehicle body of FIG. It is a schematic vertical sectional view which shows the front part structure of the vehicle body of FIG. FIG. 1 is a schematic side view showing the front structure of the vehicle body, (a) is a normal state, (b) is a state in which the absorbing member is deformed by a load from the front, and (c) is a pressure received by a load from the front. Indicates a state in which the member is opened up and down.

The vehicle body front structure as an embodiment will be described with reference to the drawings. The embodiments shown below are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified in the following embodiments. Each configuration of the present embodiment can be variously modified and implemented without departing from the gist thereof. In addition, it can be selected as needed, or can be combined as appropriate.

In the following description, the traveling direction of the vehicle is the front (front of the vehicle), the opposite side is the rear (rear of the vehicle), and the left-right direction (vehicle width direction) is determined with reference to the front. Further, the direction of gravity will be described as downward, and the opposite will be described as upward. Further, UP, FR, and LH shown in the figure correspond to each of the upper part of the vehicle, the front part of the vehicle, and the left side of the vehicle.

[1. Constitution]
FIG. 1 illustrates a vehicle 1 to which the vehicle body front structure of the present embodiment is applied. The vehicle 1 is a frame vehicle in which the body 1B is mounted on the frame 1A via the mount 4, and has a separate frame structure in which the frame 1A and the body 1B are separated. FIG. 1 schematically shows a state in which the frame 1A and the body 1B are separated by omitting the power train, the suspension device, and the like mounted on the vehicle 1.

The frame 1A is a structural member forming the skeleton of the vehicle 1 and supports the load acting on the vehicle 1. The frame 1A shown in FIG. 1 is a ladder frame formed by connecting a pair of left and right side members 2 and a plurality of cross members 3 in a ladder shape, and is arranged so that the vehicle front-rear direction (front-rear direction) is the longitudinal direction. Will be done. The side member 2 is a main frame extending in the front-rear direction over almost the entire length from the front end portion to the rear end portion of the vehicle 1, and is spaced in the vehicle width direction so as to have a substantially symmetrical shape. Be placed. The cross-sectional shape of the side member 2 is formed, for example, a closed cross-sectional shape or a U-shape.

The cross member 3 is a member that extends in the vehicle width direction and connects the side members 2, and a plurality of cross members 3 are arranged at intervals in the front-rear direction. Similar to the side member 2, the cross-sectional shape of the cross member 3 is formed in a closed cross-sectional shape or a U-shape. The vehicle 1 of the present embodiment includes a crash box 5 attached to the front side of the front end portion of the side member 2. The crash box 5 is a hollow-shaped member for absorbing load (impact). For example, the crash box 5 has a box shape formed in substantially the same dimensions as the vertical dimension and the vehicle width dimension of the front end portion of each side member 2. It is formed. In the present embodiment, the front end surface portion 5a (see FIG. 4) of the crash box 5 has a flat plate shape facing forward.

In the vehicle 1 having a frame structure, the structure is not arranged below the front end portion of the side member 2 in order to secure the approach angle. Therefore, at the time of a frontal collision of the vehicle 1, the front end portion of the side member 2 hits the collision target (collision target) and receives the collision load by the front end portion, which causes a problem that the deformation of the collision target tends to be large.

Therefore, the vehicle 1 of the present embodiment is provided in front of the side member 2 with a deformed structure that secures an approach angle during normal traveling and functions as a surface that receives a collision load during a frontal collision. The modified structure of the present embodiment is provided in place of the bumper beam mounted on a general vehicle. In other words, the deformed structure also functions as a bumper beam.

The vehicle body front structure of the present embodiment includes this deformed structure and an absorbing member 20 for enhancing protection against pedestrians. That is, in the front structure of the vehicle body, damage reduction at the time of a frontal collision with a vehicle, a building, etc. is compatible without impairing the pedestrian protection performance at the time of a collision with a pedestrian.

Hereinafter, the vehicle body front structure will be described with reference to FIGS. 2, 3, 4, and 5 (a) to 5 (c). 2, FIG. 3, FIG. 4 and FIG. 5 (a) show a normal state in which the vehicle 1 is not particularly deformed (hereinafter referred to as “normal state”), and FIGS. 5 (b) and 5 (c) are vehicles. The deformed state of the deformed structure when the load is input from the front of 1 is shown. Note that FIG. 3 is a perspective view showing the absorbing member 20 disassembled from the deformed structure. Further, FIG. 4 is a vertical cross-sectional view of the deformed structure (AA cross-sectional view taken along the line in FIG. 3). In FIG. 4, hatching of the side member 2, the absorbing member 20, and the stopper member 40, which will be described later, is omitted.

As shown in FIGS. 5A to 5C, the vehicle body front structure includes a pressure receiving member 10 that receives a load from the front of the vehicle and is arranged in front of the pressure receiving member 10 to absorb the load from the front. An absorbing member 20 is provided. The pressure receiving member 10 is a member having a higher rigidity than the absorbing member 20. The pressure receiving member 10 may be formed of a highly rigid material such as metal, or may be made thicker to increase the rigidity. Further, the vehicle body front structure of the present embodiment is provided with a holding member 30 for holding the absorbing member 20 and a stopper member 40 for receiving the pressure receiving member 10 at the time of a frontal collision.

The vehicle body front structure of the present embodiment is configured to secure an approach angle in a normal state, but is configured to reduce damage to the collision target and protect pedestrians in the event of a frontal collision. Specifically, as shown in FIG. 5B, the vehicle body front structure absorbs the load from the front by compressing and deforming the absorbing member 20 when colliding with a pedestrian. At the time of such a light collision, the crash box 5 is often not deformed.

On the other hand, as shown in FIG. 5C, the vehicle body front structure is loaded by opening the pressure receiving member 10 up and down in the event of a collision involving deformation of the crash box 5, that is, in the event of a collision with a vehicle, a building, or the like. The area that receives the load (hereinafter referred to as the "pressure receiving area") is increased to receive the load from the front. The member having a function of receiving this load is the above-mentioned deformed structure. In other words, the vehicle body front structure of the present embodiment is configured so as not to interfere with running in a normal state, and in the case of a frontal collision, a load from the front to the rear [indicated by the white arrow in FIG. 5 (b). Shown] is received by the absorbing member 20, and the load is received by the pressure receiving member 10 that increases the pressure receiving area by opening up and down at the time of a frontal collision.

As shown in FIGS. 2 and 4, the pressure receiving member 10 of the present embodiment is arranged in front of the side member 2 and fixed to the front end portion of the side member 2. The pressure receiving member 10 of the present embodiment is fixed to the side member 2 via the crash box 5 by being bolted to the front end surface portion 5a of the crash box 5 attached to the front end portion of the side member 2.

The pressure receiving member 10 is extended in the vehicle width direction so as to connect the pair of left and right side members 2. The pressure receiving member 10 of the present embodiment is formed in an isosceles trapezoidal shape that is composed of an upper base and two trapezoidal legs in a side view, and has a vertical cross-sectional shape along the front-rear direction in the vehicle width direction. It is uniform. That is, the pressure receiving member 10 of the present embodiment includes two members (parts) 11 and 12 corresponding to two trapezoidal legs and one member (part) 13 corresponding to the upper base. In the present embodiment, the pressure receiving member 10 provided as an integral body having these three members 11 to 13 is illustrated, but these members 11 to 13 may be provided separately. The two-dot chain line in FIGS. 2 and 5 (a) to 5 (c) is a virtual boundary surface of the members 11, 13 and 12.

The first member 11 is a portion of the pressure receiving member 10 located above, and the second member 12 is a portion of the pressure receiving member 10 located below. Hereinafter, the former member 11 is referred to as an "upper pressure receiving member 11", and the latter member 12 located below the upper pressure receiving member 11 is referred to as a "lower pressure receiving member 12". Further, the third member 13 is a portion of the pressure receiving member 10 located in the middle in the vertical direction. Hereinafter, the member 13 located between the upper pressure receiving member 11 and the lower pressure receiving member 12 is referred to as an "intermediate pressure receiving member 13". The intermediate pressure receiving member 13 can be omitted.

In the present embodiment, the upper pressure receiving member 11 extending diagonally upward from the upper end of the front end surface portion 5a of the crash box 5 to slightly above the height position of the upper surface of the side member 2, and the crash box 5 An example is a lower pressure receiving member 12 extending diagonally downward from the lower end of the front end surface portion 5a of the side member 2 slightly below the height position of the lower surface of the side member 2. In the front structure of the vehicle, since the lower pressure receiving member 12 is arranged in this way, it does not protrude much below the side member 2 in the normal state, and the approach angle is secured.

The upper pressure receiving member 11 has a lower surface 11a into which a load from the front is input. The lower surface 11a of the upper pressure receiving member 11 has a planar shape, and as shown in FIG. 2, extends obliquely upward from the first fixing portion 11b with respect to the side member 2. At the time of a frontal collision, the upper pressure receiving member 11 rotates upward and rearward about the first fixing portion 11b with respect to the side member 2 due to the load input to the lower surface 11a as shown by the white arrow in FIG. 5B. Then, it functions as a surface for receiving the load. The upper pressure receiving member 11 of the present embodiment is provided as a rectangular rigid flat plate extending in the vehicle width direction.

Similarly, the lower pressure receiving member 12 has an upper surface 12a into which a load from the front is input. The upper surface 12a of the lower pressure receiving member 12 has a flat surface, and as shown in FIG. 2, extends diagonally downward from the second fixing portion 12b with respect to the side member 2. At the time of a frontal collision, the lower pressure receiving member 12 is rearward on the lower side centering on the second fixing portion 12b with respect to the side member 2 due to the load input to the upper surface 12a as shown by the white arrow in FIG. It rotates to function as a surface that receives the load. In the present embodiment, the lower pressure receiving member 12 is also provided as a rectangular rigid flat plate extending in the vehicle width direction.

The first fixing portion 11b is a portion of the upper pressure receiving member 11 that is fixed to the side member 2, and corresponds to the rear end portion of the upper pressure receiving member 11. Similarly, the second fixing portion 12b is a portion of the lower pressure receiving member 12 that is fixed to the side member 2, and corresponds to the rear end portion of the lower pressure receiving member 12. In the present embodiment, as shown in FIG. 2, the positions in the front-rear direction of the first fixing portion 11b and the positions in the front-rear direction of the second fixing portion 12b are arranged to be the same.

The intermediate pressure receiving member 13 is a member that connects the first fixing portion 11b and the second fixing portion 12b. The intermediate pressure receiving member 13 of the present embodiment is a rectangular rigid flat plate extending in the vehicle width direction, and the rectangular surface is arranged so as to face forward. Hereinafter, the surface arranged so as to face the front of the vehicle is referred to as a front surface 13a. The front surface 13a is a surface on which a load from the front is input, and is formed in a plane like the lower surface 11a and the upper surface 12a.

The intermediate pressure receiving member 13 is arranged so that the front surface 13a is positioned perpendicular to the front-rear direction. Further, as shown by a two-dot chain line in FIG. 2, the first fixing portion 11b of the upper pressure receiving member 11 is connected to the upper end portion of the intermediate pressure receiving member 13, and the second fixing portion 11b of the lower pressure receiving member 12 is connected to the lower end portion. The fixed portion 12b is connected. It is preferable that these three members 11 to 13 have rigidity such that the surfaces 11a, 12a, and 13a do not bend even when a load is applied from the front.

As shown in FIG. 4, the pressure receiving member 10 of the present embodiment is fixed to the side member 2 by bolting the intermediate pressure receiving member 13 to the front end face portion 5a of the crash box 5. That is, the intermediate pressure receiving member 13 is provided with a hole 13h through which the bolt 50 is inserted. In the intermediate pressure receiving member 13 of the present embodiment, the bolt 50 inserted into the hole portion 13h is also inserted into the holding member 30 and the front end surface portion 5a of the crash box 5, and the nut 51 is inserted from the back side (rear side) of the front end surface portion 5a. By being tightened with, the holding member 30 and the crash box 5 are fastened together and fixed to the side member 2. If the nut 51 cannot be inserted from the rear of the crash box 5, an insert nut may be provided on the front end surface portion 5a. The first fixing portion 11b and the second fixing portion 12b are fixed to the side member 2 by being connected to the intermediate pressure receiving member 13 fixed in this way.

Further, as shown in FIG. 3, all of the three members 11 to 13 constituting the pressure receiving member 10 of the present embodiment have a vehicle width direction dimension longer than the distance between the left and right side members 2. That is, both the first fixing portion 11b and the second fixing portion 12b are fixed to the side member 2 at a portion slightly inside in the vehicle width direction from the left and right end portions of the upper pressure receiving member 11 and the lower pressure receiving member 12. There is.

As shown in FIG. 2, the absorbing member 20 is provided along the pressure receiving member 10 in front of the pressure receiving member 10. The absorbing member 20 is a member that absorbs a collision load by compressing and deforming in the front-rear direction at the time of a frontal collision, and is formed of, for example, a metal or resin foam material or a lattice rib structure. The absorbing member 20 has a thickness in the front-rear direction in order to enable the above-mentioned compression deformation. Further, the absorbing member 20 of the present embodiment is fixed to the holding member 30 by, for example, clipping.

The absorbing member 20 of the present embodiment is formed in a quadrangular pyramid shape, and is arranged so that the smaller surface of the two parallel bottom surfaces faces forward, and the larger area is held. The member 30 is arranged so as to abut the front surfaces 31f and 32f described later. The vertical dimension of the surface on the holding member 30 side is set to be larger than the distance (vertical length) between the first fixing portion 11b and the second fixing portion 12b of the pressure receiving member 10.

Further, in the absorbing member 20 of the present embodiment, the dimension in the vehicle width direction is set to be the same as the dimension in the vehicle width direction of the pressure receiving member 10. That is, the absorbing member 20 is arranged in front of the pressure receiving member 10 in the entire vehicle width direction to absorb the load from the front.

As shown in FIGS. 2 and 4, the holding member 30 that holds the absorbing member 20 is arranged between the pressure receiving member 10 and the absorbing member 20 and is fixed to the front end portion of the side member 2. The holding member 30 of the present embodiment extends in the vehicle width direction and has the same vehicle width direction dimension as the pressure receiving member 10. Further, the holding member 30 of the present embodiment is composed of an upper holding member 31 that holds the upper part of the absorbing member 20 and a lower holding member 32 that holds the lower part of the absorbing member 20.

As shown in FIGS. 2 and 3, both the upper holding member 31 and the lower holding member 32 are formed in a hollow shape, and when a load is input from the front and deformed, the lower surface of the upper pressure receiving member 11 is formed. The above load is transmitted so as to push up 11a and push down the upper surface 12a of the lower pressure receiving member 12. In the present embodiment, the case where the upper holding member 31 and the lower holding member 32 are both formed in a hollow pentagonal prism shape and arranged vertically symmetrically is illustrated.

The upper holding member 31 of the present embodiment has a front surface 31f facing forward and abutting on the absorbing member 20, an upper surface 31u facing diagonally upward and abutting on the lower surface 11a of the upper pressure receiving member 11, and an intermediate pressure receiving member 31 facing rearward. It has a rear surface 31r that abuts on the member 13, a first lower surface 31b that faces downward and abuts on the lower holding member 32, and a second lower surface 31e that faces diagonally forward downward. The upper holding member 31 forms a hollow pentagonal prism shape by arranging the flat surfaces having these surfaces in this order.

The lower holding member 32 is formed in a vertically symmetrical shape with the upper holding member 31. That is, the lower holding member 32 has a front surface 32f that faces forward and abuts on the absorbing member 20, a lower surface 32b that faces diagonally rearward and abuts on the lower pressure receiving member 12, and an intermediate pressure receiving member 13 that faces rearward. It has a rear surface 32r that abuts on the upper surface 32r, a first upper surface 32u that faces upward and abuts on the first lower surface 31b of the upper holding member 31, and a second upper surface 32e that faces diagonally forward on the upper side. The lower holding member 32 forms a hollow pentagonal prism shape by arranging the flat surfaces having these surfaces in this order.

The upper holding member 31 and the lower holding member 32 are formed in a shape that fits inside the pressure receiving member 10 (between the upper pressure receiving surface portion 11 and the lower pressure receiving surface portion 12 and on the front side of the intermediate pressure receiving surface portion 13) without any gap. There is. However, the front-rear positions of the front surfaces 31f and 32f of the upper holding member 31 and the lower holding member 32 are set slightly forward of the front end portion of the pressure receiving member 10. The front surfaces 31f and 32f are the frontmost surfaces of the five side surfaces of the upper holding member 31 and the lower holding member 32, are arranged so as to be perpendicular to the front-rear direction, and are arranged to be perpendicular to each other. They are arranged so that their positions in the front-rear direction are the same.

The rear surfaces 31r and 32r are the rearmost surfaces of the five side surfaces of the upper holding member 31 and the lower holding member 32, and are arranged so as to be perpendicular to the front-rear direction. The rear surfaces 31r and 32r are set to be slightly shorter than the vertical dimension of the front surface 13a of the intermediate pressure receiving member 13 so that the entire surface of each surface is in contact with the front surface 13a of the intermediate pressure receiving member 13.

As shown in FIG. 4, the rear surfaces 31r and 32r of the upper holding member 31 and the lower holding portion 32 are provided with holes 30h for fastening, and the bolts 50 and nuts 51 are tightened on the front surfaces 31f and 32f. A notch 30a for inserting a tool (not shown) is provided. The holding member 30 is fastened together with the front end surface portion 5a of the crash box 5 by a tool inserted through the notch 30a so that the flat surface portions having the rear surfaces 31r and 32r sandwich the pressure receiving member 10 (intermediate pressure receiving surface portion 13). Then, it is fixed to the side member 2.

The first lower surface 31b of the upper holding member 31 and the first upper surface 32u of the lower holding member 32 are both arranged so as to be perpendicular to the vertical direction and are joined in a state of being in contact with each other. The front ends of the first lower surface 31b and the first upper surface 32u of the present embodiment are joined to each other by spot welding. The black circles in FIGS. 3 and 4 indicate spot welding points. By joining the upper holding member 31 and the lower holding member 32 in this way, the holding member 30 suppresses the generation of noise due to collision with each other in a normal state, and promptly receives a load from the front. The joints peel off from each other.

The stopper member 40 is arranged behind the pressure receiving member 10 so that the lower surface 11a and the upper surface 12a face forward when a load is input to the lower surface 11a of the upper pressure receiving member 11 and the upper surface 12a of the lower pressure receiving member 12. It receives these members 11 and 12. As shown in FIGS. 2 to 4, the stopper member 40 of the present embodiment is fixed to each of the upper surface and the lower surface of the pair of left and right crash boxes 5.

The stopper member 40 of the present embodiment has a triangular prism shape, and is arranged in a posture in which the height direction coincides with the vehicle width direction. Further, the surface of the stopper member 40 facing forward (hereinafter referred to as "regulatory surface") is arranged so as to be positioned perpendicular to the front-rear direction. The regulating surface of the stopper member 40 has a function of regulating the position of the pressure receiving member 10 by receiving when each of the upper pressure receiving member 11 and the lower pressure receiving member 12 rotates backward. In other words, the stopper member 40 has a rigidity that can receive the upper pressure receiving member 11 and the lower pressure receiving member 12 and regulate the stopper member 40 so as not to be deformed rearward.

[2. Action]
Next, the action of the vehicle body front structure at the time of a frontal collision of the vehicle 1 will be described.

As shown in FIG. 5B, at the time of a frontal collision of the vehicle 1, the absorbing member 20 is first compressed and deformed backward to attenuate the load from the front. At this time, when the target of the frontal collision is a pedestrian, most of the load is absorbed by the absorbing member 20. Therefore, the reaction force from the pressure receiving member 10 and the side member 2 is less likely to be transmitted to the pedestrian who is the collision target, and the pedestrian can be protected.

On the other hand, when the target of the frontal collision is not a pedestrian but a highly rigid object such as a vehicle or a building, the absorbing member 20 cannot completely absorb all the loads. The load that cannot be completely absorbed by the absorbing member 20 is input to the lower surface 11a of the upper pressure receiving member 11 and the upper surface 12a of the lower pressure receiving member 12 as shown by the white arrows in FIG. 5B. By transmitting these loads, the pressure receiving member 10 rotates rearward around the fixing portions 11b and 12b and opens up and down. In other words, at the time of a collision in which a load larger than that at the time of a collision with a pedestrian is input (for example, at the time of a collision with a vehicle, a building, etc.), the load that cannot be completely absorbed by the absorbing member 20 is the lower surface of the pressure receiving member 10. The 11a and the upper surface 12a are expanded to change the shape of the pressure receiving member 10 from the normal state.

When a load that cannot be completely absorbed by the absorbing member 20 is input to the pressure receiving member 10, this load is also input to the holding member 30 to peel off the joint between the upper holding member 31 and the lower holding member 32. Further, both the upper holding member 31 and the lower holding member 32 are compressed and deformed in the front-rear direction by the load input from the front, and the area is expanded in the vertical direction. By being deformed in this way, the holding member 30 transmits the load from the front to the pressure receiving member 10 so as to push up the lower surface 11a of the upper pressure receiving member 11 and push down the upper surface 12a of the lower pressure receiving member 12, and the pressure receiving member 10 Assists in the transformation of.

As shown in FIG. 5C, when the pressure receiving member 10 opens up and down, the stopper member 40 receives the upper pressure receiving member 11 and the lower pressure receiving member 12 so that the lower surface 11a and the upper surface 12a face forward. Specifically, the regulating surface of the stopper member 40 fixed to the upper surface of the crash box 5 receives the upper pressure receiving member 11, and the regulating surface of the stopper member 40 fixed to the lower surface of the crash box 5 receives the lower pressure receiving member 12. Take it. In this way, the position of the pressure receiving member 10 is regulated so as not to be deformed rearward from the stopper member 40.

When the pressure receiving member 10 opens up and down and the lower surface 11a and the upper surface 12a face forward, the front-rear position of the front surface 13a of the intermediate pressure-receiving member 13 becomes substantially the same as the front-rear position of the lower surface 11a and the upper surface 12a. Therefore, in addition to the lower surface 11a and the upper surface 12a, the front surface 13a also functions as a surface for receiving the collision load. The pressure receiving member 10 receives the load that the absorbing member 20 could not absorb by the three surfaces 11a, 12a, and 13a, thereby reducing the damage to the collision target. That is, the pressure receiving member 10 receives the load from the front in a pressure receiving area wider than the area of the front end portion of the side member 2, thereby suppressing the deformation of the collision target and reducing the damage of the collision target.

[3. effect]
(1) In the above-mentioned vehicle body front structure, when the vehicle 1 collides with the front surface, the absorbing member 20 arranged in front of the pressure receiving member 10 is compressed and deformed to absorb the load from the front. Therefore, it is possible to achieve both without impairing the pedestrian protection performance in the event of a collision with a pedestrian. Further, when the pressure receiving member 10 opens up and down at the time of a frontal collision of the vehicle 1, the pressure receiving area is increased, and the load from the front can be received in a wide area. Therefore, in the event of a collision with a vehicle or a building, damage to the collision target can be reduced. Therefore, in the above-mentioned vehicle body front structure, it is possible to achieve both reduction of damage to the collision target without impairing the pedestrian protection performance.

Further, in the above-mentioned vehicle body front structure, in a normal state, the lower pressure receiving member 12 is obliquely downward from the lower end of the front end surface portion 5a of the crash box 5 toward the front and diagonally downward, and is higher than the height position of the lower surface of the side member 2. It will be extended slightly downward. Therefore, in the normal state, the approach angle of the vehicle 1 can be secured without protruding much below the side member 2.

Further, in the vehicle body front structure, the lower surface 11a of the upper pressure receiving member 11 extends diagonally upward toward the front, and the upper surface 12a of the lower pressure receiving member 12 extends diagonally downward toward the front. That is, since the two surfaces 11a and 12a are arranged so that the load from the front is input diagonally, the pressure receiving member 10 can be smoothly opened up and down, and the load from the front can be applied to the front end of the pressure receiving member 10. I don't take it in the part.

(2) In the vehicle body front structure, the front-rear position of the first fixing portion 11b and the front-rear position of the second fixing portion 12b are the same. Therefore, when the pressure receiving member 10 is opened vertically, the front-rear position of the lower surface 11a and the front-rear position of the upper surface 12a are substantially the same, so that the load from the front is applied to the upper pressure receiving member 11 and the lower pressure receiving member 12. It becomes difficult to be biased to either one. Therefore, both the upper pressure receiving member 11 and the lower pressure receiving member 12 can receive the load from the front, and the damage to the collision target can be reduced.

Further, the pressure receiving member 10 includes an intermediate pressure receiving member 13 having a front surface 13a for connecting the first fixing portion 11b and the second fixing portion 12b and inputting a load. Therefore, since the three surfaces 11a, 12a, and 13a can function as surfaces for receiving the collision load, the pressure receiving area can be further increased.

(3) In the vehicle body front structure described above, the pressure receiving member 10 is an integral body having an upper pressure receiving member 11, an intermediate pressure receiving member 13, and a lower pressure receiving member 12. Therefore, the pressure receiving member 10 can be easily attached to the side member 2 as compared with the case where the members 11, 12, and 13 are separately provided. Further, since the lower surface 11a, the front surface 13a, and the upper surface 12a where the load is input are all flat, the load can be received on a wide surface, and the damage to the collision target can be further reduced.

(4) In the vehicle body front structure described above, the pressure receiving member 10 extends in the vehicle width direction so as to connect the pair of left and right side members 2, and the absorbing member 20 is provided along the pressure receiving member 10. Therefore, the pressure receiving member 10 can receive the load from the front in the entire vehicle width direction, and the absorbing member 20 can absorb the load from the front in the entire vehicle width direction. That is, it is possible to further reduce the damage of the collision target and further enhance the pedestrian protection. Further, the pressure receiving member 10 and the absorbing member 20 can function as a substitute for the bumper beam.

(5) In the above-mentioned vehicle body front structure, when a load is input to the lower surface 11a and the upper surface 12a, the stopper member 40 is placed on the upper pressure receiving member 11 and the lower surface so that the surfaces 11a and 12a both face forward. Receives the side pressure receiving member 12. Therefore, it is possible to prevent the two surfaces 11a and 12a from rotating backward, and it is possible to receive the load more reliably.

(6) In the above-mentioned vehicle body front structure, since the absorbing member 20 is fixed to the front end portion of the side member 2 while being held by the holding member 30, the load from the front is first absorbed by the absorbing member 20. It can be attenuated. Therefore, at the time of a collision with a pedestrian, most of the load can be absorbed by the absorbing member 20, so that the pedestrian can be protected. Further, since the load that cannot be completely absorbed by the absorbing member 20 can be received by the wide surface of the pressure receiving member 10, it is possible to reduce the damage to the collision target.

(7) Since the holding member 30 is formed in a hollow shape, it is deformed so as to expand its vertical dimension when it is deformed by a load. That is, the holding member 30 can transmit the load from the front to the pressure receiving member 10 so as to push up the lower surface 11a and push down the upper surface 12a, and can assist the deformation of the upper pressure receiving member 11 and the lower pressure receiving member 12. Therefore, since the pressure receiving area is easily expanded, the damage to the collision target can be further reduced.

[4. Modification example]
Although the above-mentioned vehicle body front structure is applied to the vehicle 1 not provided with the bumper beam, the above-mentioned vehicle body front structure may be applied to the vehicle equipped with the bumper beam. Further, in the present embodiment, the vehicle 1 is provided with the crash box 5, but the above-mentioned vehicle body front structure may be applied to the vehicle without the crash box.

In the above vehicle body front structure, the pressure receiving member 10 is extended in the vehicle width direction so as to connect the pair of left and right side members 2, but the pressure receiving member is applied only to one of the pair of left and right side members 2. It may have a fixed configuration. Further, in the above-mentioned vehicle body front structure, the absorbing member 20 is provided along the pressure receiving member 10, but the absorbing member may be intermittently arranged over the entire vehicle width direction.

In the present embodiment, the configuration in which the pressure receiving member 10 includes the intermediate pressure receiving member 13 is illustrated, but the intermediate pressure receiving member 13 may be omitted. In this case, the upper pressure receiving member 11 and the lower pressure receiving member 12 may be provided separately. When the upper pressure receiving member 11 and the lower pressure receiving member 12 are provided separately, both the first fixing portion 11b and the second fixing portion 12b are directly (intermediate pressure receiving) with respect to the front end portion of the side member 2. It is fixed (without going through the member 13). Further, in this case, the positions of the two members 11 and 12 can be freely set. Therefore, for example, the above vehicle front structure can be applied to a vehicle in which the front-rear position of the first fixing portion 11b and the front-rear position of the second fixing portion 12b cannot be arranged at the same position. it can.

Further, when the intermediate pressure receiving member 13 is omitted, the first fixing portion 11b and the second fixing portion 12b may be connected to integrally form the upper pressure receiving member 11 and the lower pressure receiving member 12. In this case, the pressure receiving member can be easily attached to the side member 2 as compared with the case where the two members 11 and 12 are provided separately.

In the vehicle body front structure of the present embodiment, a configuration including a holding member 30 for holding the absorbing member 20 has been illustrated, but the holding member 30 may be omitted. In this case, the same effect can be obtained by holding the absorbing member 20 on the body 1B of the vehicle 1. That is, even if the holding member 30 is omitted, the same effect can be obtained if the absorbing member 20 is arranged in front of the pressure receiving member 10.

Further, in the present embodiment, the holding member 30 including the upper holding member 31 and the lower holding member 32 is illustrated, but the holding member is formed in a shape that fits inside the pressure receiving member 10 without a gap. It may be only one hollow member. The holding member does not have to be a hollow member.

In the vehicle body front structure of the present embodiment, the configuration including the stopper member 40 is illustrated, but the configuration in which the stopper member 40 is omitted may be omitted. In this case, for example, by forming each of the upper pressure receiving member 11 and the lower pressure receiving member 12 into a right-angled triangular columnar shape or a rectangular parallelepiped shape, it is possible to make it difficult to rotate each of the upper pressure receiving member 11 and the lower pressure receiving member 12 rearward. it can.

For example, when the upper pressure receiving member is a member having a right-angled triangular columnar shape, one of the two side surfaces forming a right angle is arranged in the same manner as the lower surface 11a, and the other extends diagonally upward toward the rear. It may be arranged so as to do. Further, the lower pressure receiving member of the right-angled triangular columnar is also arranged in the same manner (vertically symmetrically). With such a configuration, when the pressure receiving member opens up and down, that is, when the upper pressure receiving member and the lower pressure receiving member rotate backward, the other of the two side surfaces abuts on the crash box 5. Therefore, both the one side surface corresponding to the lower surface 11a and the one side surface corresponding to the upper surface 12a stop in a state of facing forward, and the rotation to the rear can be restricted.

The stopper member 40 may be configured to receive the upper pressure receiving member 11 and the lower pressure receiving member 12 so that the lower surface 11a and the upper surface 12a face forward, and is not limited to the above configuration. For example, the stopper member 40 may have a square prism shape instead of a triangular prism shape.

1 vehicle (frame vehicle)
1A Frame 1B Body 2 Side member 3 Cross member 4 Mount 5 Crash box 10 Pressure receiving member 11 Upper pressure receiving member 11a Lower surface 11b First fixing part 12 Lower pressure receiving member 12a Upper surface 12b Second fixing part 13 Intermediate pressure receiving member 13a Front 13h Hole 20 Absorbent member 30 Holding member 30a Notch 30h Hole 31 Upper holding member 32 Lower holding member 31f, 32f Front 31r, 32r Rear surface 31u Upper surface 31b First lower surface 31e Second lower surface 32b Lower surface 32u First upper surface 32e Second upper surface 40 Stopper member 50 bolt 51 nut

Claims (7)

It is the front structure of the vehicle body of a frame vehicle equipped with a pair of left and right side members extending in the front-rear direction of the vehicle at intervals in the vehicle width direction.
A pressure receiving member that is arranged in front of the vehicle from the side member and is fixed to the front end of the side member to receive a load from the front of the vehicle.
An absorbing member which is arranged in front of the vehicle and absorbs the load is provided.
The pressure receiving member includes an upper pressure receiving member that extends diagonally upward from the first fixing portion to the side member and has a lower surface into which the load is input, and is arranged below the upper pressure receiving member. The front body structure is characterized by including a lower pressure receiving member that extends diagonally downward from the second fixing portion to the side member toward the front of the vehicle and has an upper surface into which the load is input. .. The vehicle front-rear direction position of the first fixing portion and the vehicle front-rear direction position of the second fixing portion are the same.
The first aspect of the invention, wherein the pressure-receiving member includes an intermediate pressure-receiving member that connects the first fixing portion and the second fixing portion and has a front surface that faces the front of the vehicle and receives the load. The front structure of the car body. The pressure receiving member is an integral body having the upper pressure receiving member, the intermediate pressure receiving member, and the lower pressure receiving member, and the lower surface, the front surface, and the upper surface are all planar. The vehicle body front structure according to claim 2. The pressure receiving member is extended in the vehicle width direction so as to connect the pair of left and right side members.
The vehicle body front structure according to any one of claims 1 to 3, wherein the absorbing member is provided along the pressure receiving member. A stopper member arranged behind the vehicle of the pressure receiving member is provided.
The stopper member is characterized in that it receives the upper pressure receiving member and the lower pressure receiving member so that the lower surface and the upper surface face the front of the vehicle when the load is input to the lower surface and the upper surface. Item 4. The vehicle body front structure according to any one of Items 1 to 4. The first to fifth aspects of the present invention, wherein the holding member is provided between the pressure receiving member and the absorbing member and is fixed to the front end portion of the side member to hold the absorbing member. The vehicle body front structure according to any one item. Any of claims 1 to 6, wherein the holding member is formed in a hollow shape, and when deformed by the load, the load is transmitted so as to push up the lower surface and push down the upper surface. The vehicle body front structure according to item 1.

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