JP5928869B2 - Dash cross member mounting structure at the front of the vehicle body - Google Patents

Description

  The present invention relates to a structure for attaching a dash cross member at a front portion of a vehicle body.

  In an automobile having an engine room at the front of the vehicle body, the engine room and the vehicle interior are partitioned by a dash panel, and dash side panels are provided on both sides of the dash panel. The lower part of the dash panel is joined to the floor panel that defines the passenger compartment floor, and the center of the lower part of the dash panel protrudes upward in the longitudinal direction of the vehicle body at the center of the floor panel in the vehicle width direction. There is a tunnel. A front side member is usually provided on both sides of the engine room, and a floor side member continuous with the front side member is disposed on the lower surface side of the floor panel. And the dash cross member is arrange | positioned in the vehicle width direction for reinforcement of a dash panel part (for example, patent documents 1-7).

JP 2010-264906 A JP 2010-6154 A JP 2008-168687 A JP-A-2005-206108 Japanese Patent Laid-Open No. 9-109928 JP 2002-362419 A JP 2008-68826 A

  According to the prior art, when a load is applied to the bumper from the front, in addition to the route to the floor side member and side sill via the front side member, there is also a route transmitted from the dash panel to the dash cross member and transmitted to the floor tunnel. The load is distributed. For this reason, in order to increase the load distribution to the floor tunnel and lighten the burden on the floor side member, it is necessary to improve the rigidity of the dash cross member (increase in the closed cross-sectional area and increase in the plate thickness) and press the surrounding layout. There is a concern about weight increase.

  The dash panel that separates the engine room from the vehicle compartment serves to shield vibration noise. In order to improve the rigidity of this single dash panel, it is possible to form the whole into a convex curved surface or increase the plate thickness. However, there is a concern about pressure on the peripheral layout and an increase in weight. Furthermore, the local uneven shape increases the drawing depth of the press and deteriorates the moldability.

  Furthermore, the engine and the engine piping are adjacent to the front surface of the dash panel, and a degree of freedom in space is required to secure the degree of freedom in the piping layout. If the shape of the dash panel is made to escape for the engine and the piping of the engine, the shape of the dash panel becomes complicated, and there is a concern about a decrease in rigidity. Moreover, the local uneven | corrugated shape becomes deep in the drawing depth of a press, and a moldability deteriorates. When there is a dash cross member, it is necessary to avoid the bulge of the dash cross member before and after from the peripheral layout, and the shape of the dash panel becomes more complicated.

  Furthermore, the rear surface of the dash panel is provided with pedals for the driver's seat and a steering shaft through hole, and a degree of freedom in space is required to ensure the degree of freedom of the pedals and the steering shaft layout. If the shape of the dash panel is made to escape due to the pedal layout, the shape of the dash panel becomes complicated, and there is a concern that the rigidity may be lowered. In addition, when there is a dash cross member, it is necessary to avoid the bulge of the dash cross member before and after from the peripheral layout, and the shape of the dash panel becomes more complicated. Thereby, local uneven | corrugated shape and the drawing depth of a press become deep, and a moldability deteriorates.

  The present invention solves the above-mentioned problems, reduces the burden on the floor side member by efficiently distributing the load to the floor tunnel, and does not interfere with the engine and its piping, pedals or steering shaft, etc. It is an object of the present invention to provide a dash cross member mounting structure in a front portion of a vehicle body capable of ensuring the above.

In order to solve the above-mentioned problems, the present invention forms a dash panel that partitions the front part of the passenger compartment, a pair of left and right front side members that extend forward from the dash panel, and a lower surface of the passenger compartment that is continuous with the dash panel. A dash cross member mounting structure in the front part of the vehicle body comprising a floor panel and a floor tunnel part formed in the longitudinal direction of the vehicle body by bulging the center part of the floor panel in the vehicle width direction toward the vehicle interior side. A dash cross member disposed in the vehicle width direction between the front side members is divided into a side part and a center part, and the both side parts are joined to the front side of the dash panel. The outer end of the part is inclined to the front side of the vehicle body and joined to the front side member, respectively, and the center part is connected to the dash panel. Together joined to the rear side to form a connection portion of both side portions and the central portion of the dash cross member so that the cross section of the connection portion of the side portions and the central portion is continuous with the front and rear surfaces of the dash panel, the dash cross It joins to the rear side of the dash panel via the upper and lower flanges of the central portion of the member, and the lower flange of the central portion of the dash cross member is connected to the front end flange of the floor tunnel portion together with the front end flange of the dash panel. This is because three sheets are joined on the rear surface .

In the present invention, both side portions of the dash cross member extend in the vehicle width direction substantially horizontally from the joint portion with the front side member, and both side portions and the central portion of the dash cross member are sandwiched between the dash panels. The center line of the closed cross section formed by the curve is a curve with a large radius of curvature, and the both side portions of the dash cross member are joined at positions overlapping the upper and lower fold lines that bend rearward of the dash panel.
Still further, the present invention is such that the rear surface of the dash panel is formed so as to protrude toward the vehicle interior side in accordance with the central portion of the dash cross member, and the central portion of the dash cross member extends along the protruding portion to the vehicle interior side. This is because it is formed to be curved.

According to the present invention, the following effects can be achieved.
The dash cross member disposed in the vehicle width direction between the front side members is divided into three parts, a side part and a center part, and the both side parts are joined to the front side of the dash panel, and the outer end parts of these side parts Are inclined to the front side of the vehicle body and joined to the front side members, respectively, and the central portion is joined to the rear surface side of the dash panel, and the cross section of the connecting portion between the central portion and the both side portions is the front and rear of the dash panel. Since the connecting portion between the both side portions and the central portion of the dash cross member is formed so as to be continuous on the surface, the load applied to the front side member is transmitted from the both side portions of the dash cross member to the central portion on the rear surface side of the dash panel. It can be transmitted to the floor tunnel. The dash cross member protrudes forward on the outside of both side portions and the central portion protrudes rearward of the vehicle body, so that it is easy to transmit the load applied to the front side member to the rear of the vehicle body through the floor tunnel portion. Since it can be kept simple, the load distribution and the rigidity of the dash panel can be ensured. Since the central portion of the dash cross member does not interfere with the engine and the engine piping, the degree of freedom in layout can be ensured. Since both side portions of the dash cross member do not interfere with the pedals, the steering shaft, etc., the degree of freedom in layout can be ensured. When the engine or the like retreats toward the dash panel with a large load from the front, the load can be received by the structure of the center portion of the dash cross member and the rear floor tunnel portion.

The dash cross member is joined to the rear surface side of the dash panel via the upper and lower flanges of the center portion of the dash cross member, and the lower flange of the center portion of the dash cross member is connected to the dash panel together with the front end flange provided at the front end of the floor tunnel portion. Since the three panels are joined to the rear surface of the panel, load distribution to the floor tunnel portion is ensured.
Further, both side portions of the dash cross member extend in a vehicle width direction substantially horizontally from a joint portion with the front side member, and are formed by both side portions and a central portion of the dash cross member with the dash panel interposed therebetween. The center line of the closed cross section is a curve with a large radius of curvature, and both side portions of the dash cross member are joined at positions overlapping the upper and lower fold lines that bend to the rear of the vehicle body of the dash panel. The transmission efficiency is improved.
Furthermore, the rear surface of the dash panel is formed so as to protrude toward the vehicle interior side in accordance with the central portion of the dash cross member, and the central portion of the dash cross member is curved along the protrusion portion toward the vehicle interior side. The load can be transmitted efficiently to the floor tunnel. Since the rear surface of the dash panel protrudes toward the vehicle interior side, the surface rigidity of the dash panel can be improved.

It is the perspective view seen from the vehicle body rear which shows the attachment structure of the dash cross member in the vehicle body front part by embodiment of this invention. It is the perspective view seen from the vehicle body front of FIG. It is the front view which looked at the dash panel of FIG. 1 from the vehicle interior side. It is the front view which looked at the dash panel of FIG. 2 from the vehicle body front. FIG. 4 is a plan view of FIG. 3. (A) is the sectional view on the AA line of FIG. (B) is the BB sectional drawing of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 6 show a dash cross member mounting structure in a front portion of a vehicle body according to an embodiment of the present invention.

  As shown in FIGS. 1 to 6, the vehicle according to the embodiment of the present invention has a dash panel 4 in which the structure of the front portion of the vehicle body 1 divides the front portion of the vehicle compartment into an engine room 2 and a vehicle interior 3. A pair of left and right front side members 5 that extend forward from the dash panel 4, a floor panel 6 that forms a lower surface of the vehicle compartment 3 continuously to the dash panel 4, and a vehicle in the center of the floor panel 6 in the vehicle width direction. A floor tunnel portion 7 having a hat-shaped cross section formed in the front-rear direction of the vehicle body 1 by bulging inside the chamber 3 is configured.

  The dash panel 4 has an upper side 4a formed on a substantially vertical wall surface, and a lower side 4b formed rearward on a slanting lower slope, and the tip thereof is joined to the floor panel 6. A dash side panel 8 is joined to both sides of the dash panel 4 to form an inner wall surface of the passenger compartment 3, and a wheel house 9 is formed outside between the dash panel 4 and the lower side of the dash side panel 8. A curved surface 9a is formed to bulge indoors. A side sill portion 10 to which the outer flange portion of the floor panel 6 is joined is provided at the lower end portion of the dash side panel 8 toward the rear of the vehicle body.

  The rear ends of the pair of left and right front side members 5 are joined to the front ends of a pair of left and right floor side members 11 disposed in the vehicle longitudinal direction on the lower surface side of the floor panel 6. The front side member 5 is joined to the front end portion of the floor side member 11 through the lower end portion of the dash side panel 8 while the rear end portion 5a is curved downward. Between the front side members 5, a dash cross member 12 having both side surfaces joined to the front surface of the dash panel 4 is provided.

  The dash cross member 12 is formed by being divided into three parts, a side part 121 and a central part 122, and the both side parts 121 are joined to the front surface 4 F side of the dash panel 4 and the central part 122 is connected to the rear surface of the dash panel 4. Joining to 4R side, it is comprised so that the cross section of each connection part of this center part 12b and the said both-sides part 121 may continue in the front-and-back surface of the said dash panel 4. As shown in FIG. As shown in FIGS. 6A and 6B, the both side portions 121 and the central portion 122 of the dash cross member 12 are formed in a substantially hat-shaped cross section as shown in FIGS. 6A and 6B. The upper and lower flange portions 121a, 121b, 122a, 122b are joined to the front and rear surfaces 4F, 4R of the dash panel 4. The both side portions 121 are joined to the front surface 4F side of the dash panel 4 through upper and lower flange portions 121a and 121b, and slightly inclined so that the outer end portions 121c side of these both side portions 121 come out to the front side of the vehicle body. Thus, the front side member 5 is joined to the rear end portion 5a side and the inner side surface, respectively.

A projection 41 is formed at the center of the rear surface 4R side of the dash panel 4 so as to project inside the vehicle compartment 3 and bulge out in a trapezoidal cross section toward the rear of the vehicle body. The central portion 122 is formed along the portion 41 so as to incline so that both end portions 122c on both sides of the center gradually approach toward the rear of the vehicle body so as to protrude in a trapezoidal shape toward the rear. On the other hand, a recess 42 on the back side of the protrusion 41 is formed in the center on the front surface 4F side corresponding to the protrusion 41 on the rear surface 4R side of the dash panel 4.
The center portion 122 of the dash cross member 12 is joined to the rear surface 4R of the dash panel 4 with the lower flange 122b and the front end flange 7a provided at the front end of the floor tunnel portion 7 in a stacked manner (FIG. 6 ( b)).

Both side portions 121 of the dash cross member 12 are extended substantially horizontally from the joint portion with the front side member 5 in the vehicle width direction, and are extended to the back side of the protruding portion 41 along the slope in the recess 42. ing. The center line of the closed cross section formed by the both side portions 121 and the central portion 122 of the dash cross member 12 with the dash panel 4 interposed therebetween is formed to be a curve with a large curvature radius.
The both side portions 121 of the dash cross member 12 are joined by joining flanges 121a and 121b to the slopes in the recesses 42 of the front surface 4F of the dash panel 4 corresponding to the joint portions of the front end flange portion 7a of the floor tunnel portion 7. It is attached. Both side portions 121 of the dash cross member 12 are joined at positions overlapping the upper and lower fold lines L that are the boundary between the upper surface 4a and the lower surface 4b of the dash panel 4 that are bent rearward of the vehicle body. The engine room 2 is provided with an engine 13 and pipes 14 and 15 thereof, and the vehicle compartment 3 is provided with pedals such as a handle or a brake and an accelerator (not shown).

  According to the above embodiment, when an impact load from the front is applied to the front part of the vehicle body, the impact is transmitted to the front side members 5 on both sides of the front part. The impact load transmitted to the front side member 5 is transmitted from the base end portion of the front side member 5 to the dash panel 4 and from the front side member 5 to both side portions 121 of the dash cross member 12. The load transmitted to both side portions 121 of the dash cross member 12 is such that the outer end portion 121c of both side portions 121 protrudes forward, the central portion 122 protrudes rearward of the vehicle body, and both side portions 121 are joined to the front surface 4F side of the dash panel 4. ing. Further, the central portion 122 of the dash cross member 12 is joined to the rear surface 4R side of the dash panel 4, and the cross sections of the connecting portions of the central portion 12b and the both side portions 12a are continuous on the front and rear surfaces of the dash panel 4. Since the closed cross-sectional change is small in the way of connecting the both side portions 121 and the central portion 122 of the dash cross member 12 and it is formed like a single dash cross member, there is local variation in rigidity. Thus, the load is efficiently transmitted from the both side portions 121 on the front surface 4F side of the dash panel 4 to the central portion 122 on the rear surface 4R side of the dash panel 4 and can be transmitted to the floor tunnel portion 7.

  Accordingly, the dash cross member 12 protrudes forward at the outer sides of both side portions 122, so that the load applied to the front side member 5 can be easily transmitted to the rear of the vehicle body through the floor tunnel portion 7, and the configuration of the dash panel 4 remains simple. Therefore, the load distribution and the rigidity of the dash panel 4 can be ensured. Since the central portion 122 of the dash cross member 12 does not interfere with the engine in the engine room 2 and the piping of the engine, a degree of freedom in layout can be ensured. Since both side portions 121 of the dash cross member 12 do not interfere with pedals, a steering shaft, and the like, a degree of freedom in layout can be ensured. When the engine or the like retreats toward the dash panel 4 with a large load from the front, the load can be received by the structure of the center portion 122 of the dash cross member 12 and the rear floor tunnel portion 7.

The dash cross member 12 is joined to the rear surface 4R side of the dash panel 4 through the upper and lower flanges 122a and 122b of the center portion 122, and the lower flange 122b of the center portion 122 of the dash cross member 12 is connected to the floor tunnel portion 7. Since it can be joined to the rear surface 4R of the dash panel 4 together with the front end flange 7a provided at the front end, the load distribution to the floor tunnel portion 7 is ensured.
Further, both side portions 121 of the dash cross member 12 are extended substantially horizontally from the joint portion with the front side member 5 in the vehicle width direction, and the both side portions 121 and the central portion 122 of the dash cross member 12 are sandwiched between the dash panels 4. The center line of the closed cross section formed by the curve is a curve with a large radius of curvature, and both side portions 121 of the dash cross member 12 are joined at positions overlapping the upper and lower fold lines L that are bent rearward of the vehicle body of the dash panel 4. There is no variation, and the periphery of the folded portion of the dash panel 4 is more rigid than the planar shape, and the rigidity of the folded portion and the dash cross member 12 cooperates and the rigidity is straightly connected to the floor tunnel portion 7. The load applied to the front side member 5 can be efficiently distributed to the floor tunnel portion 7.
Furthermore, the rear surface 4R of the dash panel 4 is formed so as to protrude inside the vehicle compartment 3 in accordance with the central portion 122 of the dash cross member 12, and the central portion 122 of the dash cross member 12 is formed along the protruding portion. Since it is formed to be curved inward, a load can be efficiently transmitted to the floor tunnel portion 7. Further, since the rear surface 4R of the dash panel 4 is formed so as to protrude toward the inside of the vehicle compartment 3, the surface rigidity of the dash panel 4 can be improved.

  Note that the present invention is not limited to the above-described embodiment. For example, the dash cross member 12 is formed in three parts, that is, a side part 121 and a central part 122, and the both side parts 121 are the front surface of the dash panel 4. On the 4F side, the central portion 122 is joined to the rear surface 4R side of the dash panel 4 so that the cross sections of both side portions 121 and the central portion 122 are continuous. However, the cross section of this connecting portion is not particularly limited. It can also be connected in any shape. In addition, various modifications and changes can be made based on the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Car body 2 Engine room 3 Car compartment 4 Dash panel 4F Front 4R Rear 5 Front side member 6 Floor panel 7 Floor tunnel part 8 Dash side panel 11 Floor side member 12 Dash cross member 121 Both side parts 122 Center part 121a, 121b, 122a, 122b flange portion 121c outer end portion

Claims (3)

A dash panel that partitions the front part of the passenger compartment, a pair of left and right front side members that extend forward from the dash panel, a floor panel that continuously forms the lower surface of the passenger compartment, and the vehicle width direction of the floor panel A dash cross member mounting structure in a front part of a vehicle body having a floor tunnel part formed in the front-rear direction of the vehicle body by bulging the center part of the vehicle toward the vehicle interior side. The dash cross member arranged in the width direction is divided into three parts, a side part and a center part, and the both side parts are joined to the front side of the dash panel, and the outer ends of these side parts are inclined to the front side of the vehicle body. And joined to the front side member, and the central portion is joined to the rear side of the dash panel and the central portion. Cross connection of said side portions to form a connecting portion of both side portions and the central portion of the dash cross member so as to continue with the front and rear surfaces of the dash panel and,
The dash cross member is joined to the rear surface side of the dash panel through the upper and lower flanges of the center portion of the dash cross member, and the lower flange of the center portion of the dash cross member is combined with the front end flange provided at the front end of the floor tunnel portion. A dash cross member mounting structure in a front part of a vehicle body, characterized in that the rear panel of the dash panel is joined in three layers . A closed cross-section formed by extending both sides of the dash cross member in the vehicle width direction substantially horizontally from the joint with the front side member, and forming the both sides and the center of the dash cross member across the dash panel center line becomes large curve radius of curvature of the front vehicle body according to claim 1, characterized in that joining the both side portions of the dash cross member at a position overlapping the upper and lower polygonal line bent toward the rear of the vehicle body of the dash panel Dash cross member mounting structure in The rear surface of the dash panel is formed to protrude toward the vehicle interior side in accordance with the central portion of the dash cross member, and the central portion of the dash cross member is formed to curve toward the vehicle interior side along the protrusion. The attachment structure of the dash cross member in the vehicle body front part according to claim 1 or 2 .

Images