JP2015110358A - Vehicle lower part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lower part structure which prevents a component in an engine room from colliding with a dash panel etc. during a collision and inhibits deformation of the panel even if the component collides with the dash panel etc.SOLUTION: A vehicle lower part structure 100 includes: a floor panel 102 forming a floor surface 110 of a vehicle; a dash panel body 104 which divides a passenger compartment 118 from an engine room 120; and extension panels 106, 108. The floor panel includes: flat plate-like floor pans 112, 114 which are arranged side by side in a vehicle width direction and connected with the extension panels; and a floor tunnel 116 which extends in a vehicle fore and aft direction at a center part of the vehicle between the floor pans, protrudes to the inner side of the passenger compartment, and is connected with an arch shaped hole 162 formed by the dash panel body and the extension panels. A connection part 144 protruding to the rear side of the vehicle at an edge 164 of the arch shaped hole, with which the floor tunnel is connected, is formed in the dash panel body and the extension panels.

Description

  The present invention relates to a vehicle lower structure provided with a floor tunnel formed on a floor surface of a vehicle.

  The vehicle lower structure includes, for example, a floor panel and a dash panel. The floor panel forms a floor surface of the vehicle and has a floor tunnel. The floor tunnel extends in the vehicle front-rear direction at the center of the vehicle on the floor of the vehicle and protrudes toward the vehicle interior side. The dash panel forms a vertical wall that partitions the vehicle compartment and the engine compartment.

  In a vehicle, when a load is applied from the front during a collision, parts such as an engine mount arranged in the engine room may move toward the rear of the vehicle. In such a case, in the vehicle lower structure, there is a possibility that parts collide with the vertical wall made of the dash panel and the vertical wall and the floor surface are deformed. For this reason, a vehicle lower structure in which a floor tunnel formed on a floor panel is reinforced is required.

  Patent Document 1 describes a vehicle lower structure in which a pair of first reinforcing members and a pair of second reinforcing members are arranged in a floor tunnel. The 1st reinforcement member is each arrange | positioned along the vehicle front-back direction inside the front side upper part of a floor tunnel. The 2nd reinforcement member is each arrange | positioned along the vehicle front-back direction in the both-sides vicinity of the vehicle width direction of a floor tunnel.

  In Patent Literature 1, a vehicle longitudinal direction load applied to a front portion of a floor tunnel is received by a first reinforcing member, a second reinforcing member, and a side wall of the floor tunnel. For this reason, it is said that the deformation load of the vehicle body can be greatly improved by shear deformation of the side wall of the floor tunnel before the floor tunnel is buckled.

  Patent Document 2 describes a vehicle lower structure in which a reinforcing member is arranged on the lower surface side of the front portion of a floor tunnel. The reinforcing member has a front end projecting forward of the vehicle from the dash panel, and a vertical surface of the front end is opposed to the power train in the engine room. Moreover, the rear side part located in the vehicle rear side with respect to a vertical surface among the reinforcing members forms a closed cross-sectional portion together with the floor panel.

  In Patent Document 2, when a vehicle front collision occurs, the power train comes into contact with the vertical surface of the front end portion of the reinforcing member, and when the vertical surface is pressed toward the rear of the vehicle, the rear portion of the reinforcing member and the floor panel are formed. It is said that the collision energy can be absorbed by the deformation of the closed cross section.

JP-A-8-119151 JP-A-9-118265

  However, the techniques described in Patent Document 1 and Patent Document 2 are based on the premise that parts arranged in the engine room move rearward of the vehicle and collide with the floor tunnel at the time of collision. Therefore, in patent document 1 and patent document 2, the deformation | transformation load is improved or the collision energy is only absorbed by reinforcing a floor tunnel with a reinforcement member.

  In other words, Patent Document 1 and Patent Document 2 do not take any measures for avoiding a part arranged in the engine room from colliding with a floor tunnel, a dash panel, or the like at the time of a vehicle collision.

  SUMMARY OF THE INVENTION In view of such problems, the present invention provides a vehicle lower structure that can prevent parts in an engine room from colliding with a dash panel or the like at the time of a collision, and can suppress deformation of the panel even if it collides. The purpose is that.

  In order to solve the above problems, a typical structure of a vehicle lower structure according to the present invention includes a floor panel that forms a floor surface of the vehicle, and a dash panel that partitions a vehicle compartment and an engine room. The floor panel has a pair of flat floor pans arranged side by side in the vehicle width direction and connected to the dash panel, and a floor tunnel extending in the vehicle front-rear direction at the center of the vehicle between the floor pans and protruding toward the vehicle interior side And a floor tunnel connected to an arched hole formed by a dash panel, and the dash panel has a connection protruding rearward of the vehicle at the edge of the arched hole to which the floor tunnel is connected A portion is formed.

  According to the above configuration, the dash panel that partitions the vehicle compartment and the engine compartment is formed with the connecting portion that protrudes toward the rear of the vehicle. For this reason, it is easy to avoid colliding with a dash panel when components, such as an engine mount arrange | positioned at an engine room, move toward the vehicle rear at the time of a vehicle collision. Even if the component collides with the dash panel, the connecting portion is formed along the edge of the arch-shaped hole and connected to the upper surface and both side surfaces of the floor tunnel, so that the rigidity is high and hardly deformed.

  Said vehicle lower part structure is further equipped with the 1st reinforcement which overlaps with the upper part of the front end of a floor tunnel, and it is good for the 1st reinforcement to be connected to the connection part inside the connection part. Thereby, the upper part of the front end of the floor tunnel is covered with the first reinforcement, and the first reinforcement is located inside the connecting portion. For this reason, the rigidity of the connecting portion is enhanced by the first reinforcement. Therefore, even if a component such as an engine mount collides with the dash panel, the connecting portion is difficult to deform.

  A first flange that overlaps the connection portion is formed at the front end of the floor tunnel, and the vehicle lower structure is arranged on the bottom surface of the floor tunnel from the dash panel to the floor pan. The second reinforcement may further include a convex portion projecting downward from the dash panel to the floor pan on the outer side in the vehicle width direction of the connecting portion.

  As described above, the second reinforcement has a convex portion extending from the dash panel to the floor pan, overlapping with the first flange and the connection portion of the floor tunnel in a state where the second reinforcement is arranged from the dash panel to the floor pan. . Therefore, the range from the dash panel to the floor pan is reinforced by the second reinforcement. For this reason, when receiving an impact load, this range is hardly deformed.

  A second flange that overlaps the floor pan is formed at the lower end of the side surface of the floor tunnel, and the vehicle lower structure has a vehicle longitudinal direction straddling both sides of the floor tunnel, the second flange, and the floor pan. It is preferable to further include a pair of third reinforcements extending in the direction. Thereby, the impact load transmitted through the dash panel from the front of the vehicle is dispersed at the front end of the third reinforcement, and the floor pan is hardly deformed.

  The second reinforcement and the third reinforcement may be arranged so as to overlap each other when viewed from the vehicle width direction. Thereby, a floor pan becomes difficult to deform | transform.

  It is preferable that the amount of protrusion of the connecting portion toward the rear of the vehicle increases as the vehicle moves upward. Thereby, the space of an engine room can be enlarged more. Therefore, when an engine mount or the like moves toward the rear of the vehicle at the time of a vehicle collision, it can be easily avoided from colliding with the connecting portion.

  ADVANTAGE OF THE INVENTION According to this invention, it can avoid that the components in an engine compartment collide with a dash panel etc. at the time of a collision, and can provide the vehicle lower structure which can suppress a deformation | transformation of a panel even if it is a case where it collides temporarily.

It is a figure which shows the vehicle lower part structure in this embodiment. It is a figure which expands and shows a part of vehicle lower structure of FIG. It is AA sectional drawing of the vehicle lower part structure of FIG. It is a figure which shows a part of bottom face of the vehicle lower part structure of FIG. It is a perspective view of the vehicle lower part structure of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram showing a vehicle lower structure in the present embodiment. In addition, the arrows X and Y shown in each figure respectively show the vehicle front side and the vehicle right side. The vehicle lower structure 100 includes, for example, a floor panel 102, a dash panel body 104, and a pair of dash panel lower extensions (hereinafter, extension panels 106 and 108) that connect the floor panel 102 and the dash panel body 104. The dash panel body 104 and the extension panels 106 and 108 are collectively referred to as a dash panel.

  The floor panel 102 is a panel that forms the floor surface 110 of the vehicle, and includes a pair of floor pans 112 and 114 and a floor tunnel 116 as shown in FIG. The pair of floor pans 112 and 114 are flat members that are arranged side by side in the vehicle width direction and connected to the pair of extension panels 106 and 108. The floor tunnel 116 extends in the vehicle front-rear direction at the center of the vehicle between the floor pans 112, 114, and protrudes inside the passenger compartment 118. The dash panel body 104 is a panel that partitions the vehicle compartment 118 and the engine room 120.

  The pair of extension panels 106 and 108 are bent panels arranged side by side in the vehicle width direction, and include inclined portions 122 and 124 and horizontal portions 126 and 128. The inclined portions 122 and 124 include front ends 106 a and 108 a of a pair of extension panels 106 and 108. The front ends 106 a and 108 a are joined to the dash panel body 104 and form a vertical wall together with the dash panel body 104. The horizontal portions 126 and 128 include the rear ends 106b and 108b of the pair of extension panels 106 and 108, and the rear ends 106b and 108b are joined to the pair of floor pans 112 and 114. 110 is formed.

  The floor tunnel 116 includes an upper surface 132 and side surfaces 134 and 136 that are bent from both ends of the upper surface 132 in the vehicle width direction and extend to the floor surface 110. The main floor tunnel front reinforcement (first reinforcement 140) overlaps the upper portion of the front end 138 of the floor tunnel 116, that is, a part of the upper surface 132 and the side surfaces 134 and 136. The floor tunnel 116 is provided with a main floor tunnel rear reinforcement 142 that overlaps a part of the upper surface 132 and side surfaces 134 and 136 of the floor tunnel 116 on the rear side of the first reinforcement 140.

  A front end 138 of the floor tunnel 116 is connected to the connection portion 144. The connecting portion 144 is formed on a vertical wall including the dash panel main body 104 and the inclined portions 122 and 124 of the extension panels 106 and 108, and protrudes rearward of the vehicle. The first reinforcement 140 overlaps with the upper portion of the front end 138 of the floor tunnel 116 and forms a ridge line 146 at the connection portion 144. The ridge line 146 is located on the inner side of the connecting portion 144 as illustrated.

  The floor tunnel 116 has a first flange 148 and second flanges 150a and 150b. The first flange 148 protrudes from the front end 138 of the floor tunnel 116 so as to overlap the connecting portion 144. The second flanges 150 a and 150 b protrude from the lower ends of the side surfaces 134 and 136 so as to overlap the floor pans 112 and 114.

  The vehicle lower structure 100 includes a dash panel lower outer extension (second reinforcement 154) indicated by a dotted line in the drawing, which is disposed on the extension panel 106 and the bottom surface 152 of the floor pan 112. The front end of the second reinforcement 154 may overlap the dash panel main body 104. The vehicle lower structure 100 also includes a pair of main floor tunnel lower reinforcements (third reinforcements 156, 158). The second reinforcement 154 is located between the floor tunnel 116 and the main floor front reinforcement 160 extending in the vehicle front-rear direction.

  FIG. 2 is an enlarged view showing a part of the vehicle lower structure 100 of FIG. In FIG. 2, the first reinforcement 140, the main floor tunnel rear reinforcement 142, the second reinforcement 154, and the third reinforcements 156 and 158 of FIG. 1 are omitted. 3 is a cross-sectional view taken along the line AA of the vehicle lower structure 100 of FIG.

  As shown in FIG. 3, an arch-shaped hole 162 is formed in the vertical wall formed by the dash panel main body 104 and the inclined portions 122 and 124 of the extension panels 106 and 108. The connecting portion 144 protrudes rearward of the vehicle at the edge 164 of the arched hole 162. The front end 138 of the floor tunnel 116 is connected to the connection portion 144 in a state where the connection portion 144 formed along the edge 164 of the arch-shaped hole 162 and the first flange 148 overlap each other. FIG. 3 also shows the cross-sectional shapes of the second reinforcement 154 and the pair of third reinforcements 156 and 158 arranged on the bottom surface 152.

  In FIG. 3, an engine mount 166 is shown, which is located on the front side of the vehicle with respect to the vertical wall formed by the dash panel body 104 and the inclined portions 122 and 124 of the extension panels 106 and 108, and is located in the engine room 120. Is arranged. The engine mount 166 is attached to a suspension frame 168 that extends in the vehicle width direction, and is located at a position that overlaps with the connecting portion 144 that protrudes toward the rear of the vehicle as seen from the vehicle front-rear direction.

  As shown in FIG. 2, the connecting portion 144 increases as the protruding amount B toward the rear of the vehicle moves upward. Here, the protrusion amount B toward the rear of the vehicle has only to be increased, and the absolute position of the connecting portion 144 does not necessarily have to be shifted toward the rear of the vehicle. As shown in FIGS. 2 and 3, the side surfaces 134 and 136 of the floor tunnel 116 include vertical surfaces 170a and 170b positioned at the upper portion, and inclined surfaces 172a that are positioned at the lower portion and extend outward in the vehicle width direction as they go downward in the vehicle. 172b, and the rigidity is high.

  FIG. 4 is a view showing a part of the bottom surface 152 of the vehicle lower structure 100 of FIG. FIG. 5 is a perspective view of the vehicle lower structure 100 of FIG. The second reinforcement 154 is disposed on the bottom surface 152 from the extension panel 106 to the floor pan 112. The second reinforcement 154 includes a base portion 174 that overlaps the extension panel 106, and an extension portion 176 that extends from the base portion 174 to the vehicle rear side and is disposed on the floor pan 112.

  The base 174 has an end 178 located on the center side in the vehicle width direction. The end portion 178 overlaps the first flange 148 and the connecting portion 144 of the floor tunnel 116 as illustrated. Further, the second reinforcement 154 has a convex portion 180 that protrudes downward from the base portion 174 to the extension portion 176 on the outer side in the vehicle width direction of the connecting portion 144.

  The pair of third reinforcements 156 and 158 form a closed cross-sectional shape with the second flanges 150a and 150b across the side surfaces 134 and 136 of the floor tunnel 116, the second flanges 150a and 150b, and the floor pans 112 and 114. And it extends in the vehicle front-rear direction. The front ends 156a and 158a of the third reinforcements 156 and 158 are located near the front ends 112a and 114a of the floor pans 112 and 114, as shown in FIG.

  Here, the behavior when the vehicle lower structure 100 of the present embodiment receives an impact load from the front side of the vehicle due to the collision of the vehicle will be described. First, when the vehicle collides, the engine mount 166 disposed in the engine room 120 moves toward the rear of the vehicle. As the engine mount 166 moves, the engine mount 166 approaches a vertical wall formed by the dash panel main body 104 and the inclined portions 122 and 124 of the extension panels 106 and 108.

  On the other hand, a connecting portion 144 protruding rearward of the vehicle is formed in a position overlapping the engine mount 166 when viewed from the vehicle front-rear direction in the vertical wall. For this reason, a sufficient space is secured between the engine mount 166 and the connection portion 144. Therefore, even if the engine mount 166 moves toward the rear of the vehicle, the collision between the engine mount 166 and the connection portion 144 is easily avoided.

  Even if the engine mount 166 collides with the connection portion 144, the connection portion 144 is formed along the edge 164 of the arch-shaped hole 162 and further connected to the front end 138 of the floor tunnel 116. For this reason, the connection part 144 has high rigidity and is hard to deform | transform.

  The first reinforcement 140 covers the upper part of the front end 138 of the floor tunnel 116 and is further located inside the connecting portion 144. For this reason, the rigidity of the connection portion 144 is increased by the first reinforcement 140, and it is difficult to deform even when the engine mount 166 collides.

  The second reinforcement 154 overlaps the first flange 148 and the connection portion 144 of the floor tunnel 116 in a state where the second reinforcement 154 is disposed from the extension panel 106 to the floor pan 112. The second reinforcement 154 has a convex portion 180 extending from the extension panel 106 to the floor pan 112. Therefore, a range overlapping the second reinforcement 154 from the extension panel 106 to the floor pan 112 is reinforced by the second reinforcement 154. For this reason, when receiving an impact load, this range is hardly deformed.

  Here, a case where the second reinforcement 154 is not arranged will be considered. In such a case, the floor pan 112 is deformed along the line C shown in FIG. As a result, for example, spot welding between the floor pan 112 and the extension panel 106 and spot welding between the extension panel 106 and the dash panel main body 104 are broken, so that the deformation amount cannot be suppressed and the collision performance cannot be satisfied.

  Therefore, in the present embodiment, the second reinforcement 154 is arranged, and the second reinforcement 154 and the third reinforcement 156 are arranged so as to overlap each other in the section D when viewed from the vehicle width direction.

  The third reinforcements 156, 158 straddle the side surfaces 134, 136 of the floor tunnel 116, the second flanges 150a, 150b and the floor pans 112, 114, and the front ends 156a, 158a are front ends 112a of the floor pans 112, 114. It is located near 114a. Therefore, the impact load transmitted from the front of the vehicle through the dash panel main body 104 and the extension panels 106 and 108 is distributed at the front ends 156a and 158a of the third reinforcements 156 and 158, and the floor pans 112 and 114 are not easily deformed. .

  Further, since the protruding amount B of the connecting portion 144 toward the rear of the vehicle increases as the vehicle moves upward, the space of the engine room 120 can be further increased. Therefore, when the engine mount 166 moves toward the rear of the vehicle at the time of a collision, it can be easily avoided from colliding with the connecting portion 144.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a vehicle lower structure provided with a floor tunnel formed on a floor surface of a vehicle.

DESCRIPTION OF SYMBOLS 100 ... Vehicle lower structure, 102 ... Floor panel, 104 ... Dash panel main body, 106, 108 ... Extension panel, 110 ... Floor surface, 112, 114 ... Floor pan, 116 ... Floor tunnel, 118 ... Car compartment, 120 ... Engine room , 122, 124 ... inclined portion, 126, 128 ... horizontal portion, 132 ... upper surface, 134, 136 ... side surface, 138 ... front end, 140 ... first reinforcement, 144 ... connection portion, 148 ... first flange, 150a, 150b ... 2nd flange, 152 ... bottom surface, 154 ... 2nd reinforcement, 156, 158 ... 3rd reinforcement, 162 ... hole, 164 ... edge, 166 ... engine mount, 170a, 170b ... vertical surface, 172a, 172b ... inclined Surface, 174 ... Base, 176 ... Extension, 178 ... End, 180 ... Convex

Claims (6)

In the vehicle lower structure comprising a floor panel that forms the floor of the vehicle and a dash panel that partitions the vehicle compartment and the engine room,
The floor panel is
A pair of flat floor pans arranged side by side in the vehicle width direction and connected to the dash panel;
A floor tunnel extending in the vehicle front-rear direction at the center of the vehicle between the floor pans and protruding toward the vehicle interior side, including a floor tunnel connected to an arched hole formed by the dash panel;
The dash panel is formed with a connecting portion that protrudes toward the rear of the vehicle at the edge of an arch-shaped hole to which the floor tunnel is connected. The vehicle lower structure further includes a first reinforcement overlapping an upper part of a front end of the floor tunnel,
The vehicle lower structure according to claim 1, wherein the first reinforcement is connected to the connection portion inside the connection portion. A first flange is formed at the front end of the floor tunnel so as to overlap the connecting portion,
The vehicle lower structure further includes a second reinforcement disposed on the bottom surface from the dash panel to the floor pan and overlapping the first flange and the connection portion of the floor tunnel,
3. The vehicle lower structure according to claim 1, wherein the second reinforcement has a convex portion that protrudes downward from the dash panel to the floor pan on the vehicle width direction outer side of the connection portion. . A second flange that overlaps the floor pan is formed at the lower end of the side surface of the floor tunnel,
The said vehicle lower part structure is further equipped with a pair of 3rd reinforcement extended in the vehicle front-back direction across the both sides | surfaces of the said floor tunnel, a 2nd flange, and the said floor pan. The vehicle lower structure according to any one of the above.   The vehicle lower structure according to claim 4, wherein the second reinforcement and the third reinforcement are arranged so as to overlap each other when viewed from the vehicle width direction.   The vehicle lower structure according to any one of claims 1 to 5, wherein a protruding amount of the connecting portion toward the rear of the vehicle increases as the vehicle moves upward.

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