JP5064080B2 - Body frame structure - Google Patents

Description

  The present invention relates to a vehicle body frame structure disposed in front of a vehicle compartment and in a lower portion of the compartment.

As the body frame structure of the front part of the car body, in addition to the left and right upper frames located at the same height as the tops of the left and right front wheels, the left and right chassis members located at the same height as the floor part, the center of the front wheel There is known a structure in which left and right front side members extending in the longitudinal direction of the vehicle body are arranged at substantially the same height as the shaft (see, for example, Patent Document 1). A cowl top extending in the vehicle width direction is provided between the left and right front pillars formed respectively at the lower portions of the left and right front pillar uppers, and a dash cross member upper and a dash cross member lower are provided. An engine and a transmission are disposed inside the left and right front side members in the vehicle width direction. In such a frame structure, the front wheel may interfere with the front side member at the time of maximum steering, so it is necessary to consider the improvement of the collision energy absorption performance and the steering angle. (For example, refer to Patent Document 2). In the frame structure having such a configuration, the dash cross member upper extending in the vehicle width direction is usually attached by joining the both end faces against the inner side face of the front pillar.
Japanese Patent No. 2890938 JP 2006-143178 A

  However, the frame structure described above has the following circumstances. That is, in the configuration in which the end surface in the vehicle width direction is abutted against and joined to the inner side surface of the front pillar, the difference in the vehicle width direction between the dash cross member upper and the distance between the left and right front pillars cannot be absorbed.

  Therefore, an object of the present invention is to provide a frame structure that can absorb a dimensional difference in the vehicle width direction between a dash cross member upper and a distance between left and right front pillars and can be easily joined.

One aspect of the present invention includes a front pillar disposed below the left and right front pillars at the front of the vehicle body, a cowl top extending in the vehicle width direction between the upper portions of the left and right front pillars, comprising a dash cross member upper made of closed section extending in the vehicle width direction between the front Pila, and a dash cross member lower which extends toward the vehicle width direction between the bottom of the left and right of the front Pila, the dash cross member The upper is located below the cowl top and above the dash cross member lower, and the dash cross member upper is inclined in a vehicle width direction and a left and right outer direction from the center. extending the inclined portion has a, both end portions extending respectively the vehicle width direction on both sides through the inclined portion, the Dasshuku Having an outer surface that both vehicle transverse direction end portions of the Sumenbaappa extends in the vehicle width direction, wherein the left and right front Pila, receiving portion having a receiving surface on which the outer surface extending in the vehicle width direction is joined is formed respectively, said end The portion includes an upper surface extending in the vehicle width direction as the outer surface and a rear side surface extending in the vehicle width direction, and includes corner portions extending in the vehicle width direction between the upper surface and the rear side surface, The front pillar has a ceiling portion extending in the vehicle width direction as the receiving surface and a rear wall portion extending downward from a rear end in the vehicle body traveling direction of the ceiling portion, and between the ceiling portion and the rear wall portion, Each has a corner portion extending in the vehicle width direction, the corner portion is disposed at the corner portion, the upper surface is joined to the ceiling portion, and the rear side portion is joined to the rear wall portion. It is characterized by that.

In one embodiment of the present invention, the front pillar is formed of a die-cast material, and the dash cross member upper is formed of an extruded member having a closed cross-sectional shape having a hollow portion therein, and a receiving portion of the front pillar. The dash cross member upper has welded portions joined to both ends in the vehicle width direction by welding.

In one embodiment of the present invention, the upper part of the dash cross member is formed by bending and deforming an extruded member having a closed cross-sectional shape with a hollow portion inside the continuous cross-sectional shape,
The inclined portion extends upwardly and laterally outwardly from the central portion, the both end portions are arranged above the central portion via the inclined portion, and the shape of the receiving portion is the shape of the both end portions. It is comprised so that the shape of an outer surface may be followed, The said upper surface and the said ceiling part form a substantially horizontal surface, The said rear side surface and the said rear wall part form a vertical surface, It is characterized by the above-mentioned.

  One embodiment of the present invention is disposed in front of a passenger compartment, is located above a center axis of a front wheel, extends from the front pillar to the front of the vehicle, and is located below the center axis of the front wheel. A lower member portion that extends forward from the vehicle, a coupling portion that couples the upper member portion and the lower member portion in front of each other, and a front member portion that extends forward from the coupling portion to the vehicle. .

  According to the above configuration, the present invention can absorb the dimensional difference in the vehicle width direction between the dash cross member upper and the distance between the left and right front pillars, and can be easily joined.

  Hereinafter, a vehicle body frame structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. In addition, forward (front side), rear (rear side), left and right width directions are defined with reference to the traveling direction F of the vehicle, the direction toward the center of the width direction of the vehicle is inward (inside), and the width direction from the center of the vehicle The direction that spreads out is defined as the outward direction (outside). The direction in which gravity acts is the downward direction (lower side), and the direction against gravity is the upward direction (upper side). In the figure, arrows X, Y and Z indicate three orthogonal directions, arrow X indicates the front of the vehicle body, arrow Y indicates the vehicle width direction left side, and arrow Z indicates the vehicle body upward direction. Further, description of the symmetrical configuration will be omitted as appropriate.

  FIG. 1 schematically shows a body frame structure 1 of an automobile (vehicle) according to the present embodiment. As shown in FIGS. 1 and 2, a cowl top 13, a dash cross member upper 14, and a dash extending between the left and right front pillars 12 respectively formed at the lower portions of the left and right front pillar uppers 11, respectively. A cross member lower 15 is provided. The cowl top 13 is arranged at the upper part of the front pillar 12 and is curved so that the center part in the vehicle width direction is directed forward. The dash cross member upper 14 is disposed below the cowl top 13. In FIG. 2, the cowl top 13 is omitted.

  As shown in FIG. 3, the dash cross member upper 14 includes a horizontal central portion 14a extending horizontally to the left and right at the center in the vehicle width direction, and upward and laterally outward from the left and right ends of the horizontal central portion 14a via gentle curves. And a horizontal end portion 14c extending horizontally outwardly from the left and right end portions of the left and right inclined portions 14b through a gentle curve. The dash cross member upper 14 is curved so that the central portion in the vehicle width direction is downward, and is attached to receiving portions 16 of the left and right front pillars 12 described later at the left and right horizontal end portions 14c.

  As shown in FIGS. 4 and 5, the dash cross member upper 14 has an upper surface 14d (outer surface) and a rear side surface 14e (outer surface), and has a closed cross-sectional shape with a hollow portion inside. That is, the upper surface 14d of the substantially horizontal end portion 14c forms a substantially horizontal plane extending in the vehicle width direction, and the rear side surface 14e of the substantially horizontal end portion 14c forms a vertical surface extending in the vehicle width direction, and the vehicle width direction therebetween. A substantially right-angled corner 14f extending in the direction is formed.

  The dash cross member lower 15 is disposed below the dash cross member upper 14, and extends inward from the lower portion of the front pillar 12. Note that the end surface of the hollow member refers to the end surface of the outer peripheral portion around the hollow portion.

  As shown in FIGS. 1 and 2, side sills 21 extend from the lower portions of the left and right front pillars 12 toward the rear of the vehicle body. A floor side member 22 extends toward the rear of the vehicle body inside the side sill 21. A backbone 23 extends in the longitudinal direction of the vehicle body at the center in the vehicle width direction.

  Various cross members 24, 25, 26 extending in the vehicle width direction are provided between the left and right side sills 21. The side sill 21, the floor side member 22 and the backbone 23 extending in the front-rear direction, the dash cross member lower 15 and the various cross members 24 to 26 extending in the vehicle width direction are combined with each other in a ladder shape, and the floor frame 20 Is configured. A floor panel (not shown) that forms the floor of the passenger compartment is fixed to the upper portion of the floor frame portion 20.

  The various frame materials 13-15, 21-26, 36, 42, etc. constituting the floor frame portion 20 and the front frame portion 30 to be described later are made from an extruded member formed in an elongated shape from a light alloy lump such as an aluminum alloy, for example. The cross-sectional shape is, for example, a quadrangular shape having a hollow portion, and is continuous in the longitudinal direction with a constant closed cross-section. The curved cowl top 13 and the dash cross member upper 14 are configured to be bent and deformed as long as their cross-sectional shapes are continuous.

  The left and right front pillars 12 that connect the lower end of the front pillar upper 11 and the end of the floor frame portion 20 in the vehicle width direction are made of a light alloy casting such as a die-cast material. A receiving portion 16 to which a dash cross member upper 14 is attached is formed at the front end portion of the front pillar 12.

  As shown in FIGS. 4 and 5, the receiving portion 16 forms a ceiling portion 16a that forms a substantially horizontal surface (receiving surface) extending in the left-right direction, and a vertical surface (receiving surface) that extends downward from the rear end of the ceiling portion 16a. And a rear wall portion 16b. The ceiling portion 16a and the rear wall portion 16b form a substantially right-angled corner portion 16c extending uniformly in the left-right direction. That is, the shape of the receiving portion 16 extending in the vehicle width direction is configured to follow the shape of the outer surface of the horizontal end portion 14c of the dash cross member upper 14 extending in the vehicle width direction. The upper surface 14d of the dash cross member upper 14 is in contact with the ceiling portion 16a, the rear surface 14e of the dash cross member upper 14 is in contact with the rear wall portion 16b, and the corner portion 14f is positioned at the corner portion 16c. That is, the horizontal plane and the vertical plane extending in the left-right direction are brought into contact with each other and joined at the welded portion 17 (joined portion) extending in the left-right direction, whereby the dash cross member upper is respectively attached to the receiving portion 16 of the left and right front pillars 12. Fourteen horizontal end portions 14c are attached. 4 shows the joining structure of the end portion of the dash cross member upper 14 on the right side of the vehicle body, the left end portion is also joined to the receiving portion 16 of the left front pillar 12 in the same manner as described above.

  A front side member upper 31 (upper member portion) is provided so as to continue from the front end portion of the front pillar 12 so as to bend and extend in front of the vehicle body and downward above the center axis C of the front wheel W indicated by a broken line in FIG. ing. The rear end surface of the front side member upper 31 and the front end surface of the front pillar 12 are joined by welding. The front side member upper 31 is made of a light alloy casting such as an aluminum die-cast material. A spring house 32 and a fender shield panel 33 are integrally formed on the rear inner surface of the front side member upper 31 so as to protrude inward.

  A front side member lower 34 (lower member portion) continuously extending from the vicinity of both outer ends of the dash cross member lower 15 toward the front of the vehicle body at a level substantially lower than the center axis C of the front wheel W and the floor frame portion 20. Is provided. The front side member lower 34 is formed of a light alloy such as a die-cast material such that left and right vehicle body front extending portions 34a are curved inward in the vehicle width direction and connected at portions adjacent to each other so as to be H-shaped in plan view. It is integrally formed with a casting. The front wheels W are arranged in the left and right spaces S formed below the front side member upper 31 and outside the curved portion of the front side member lower 34.

  The front end portion of the front side member upper 31 and the front end portion of the front side member lower 34 are coupled by, for example, welding at a coupling portion 35 disposed in front of the front wheel W. As shown in FIG. 2, the shape in the vicinity of the coupling portion 35 is Y-shaped in plan view. Front side members (front member portions) 36 extending toward the front of the vehicle body are provided in front of the left and right coupling portions 35, respectively. The front end portion of the coupling portion 35 and the rear end portion of the front side member 36 are fixed by welding or bolting via flange portions provided respectively.

  A crash box 39 that extends toward the front of the vehicle body is provided in front of the front side member 36. The front end portion of the front side member 36 and the rear end portion of the crash box 39 are fixed by welding or bolting via flange portions 40 and 41 provided respectively. The crash box 39 has a function of absorbing the collision energy by collapsing the shaft when the vehicle collides at a low speed, and the portion behind the crash box 39 prevents damage.

  A front bumper beam 42 extending in the vehicle width direction is provided between the front end portions of the left and right crash boxes 39. The front bumper beam 42 has a function of distributing collision energy to the left and right crash boxes 39 and the left and right frame members 31 such as the front side member upper 31 and the front side member lower 34 located behind the crash box 39.

  The front frame portion 30 of the vehicle body is configured by the cowl top 13, the dash cross member upper 14, the front side member upper 31, the front side member lower 34, the front side member 36, the front bumper beam 42, and the like.

  In the frame structure 1 configured as described above, the impact force input from the front part is distributed to the left and right by the front bumper beam 42, absorbed by deformation of the crash box 39 and transmitted to the front side member 36. The impact force input to the front side member 36 is distributed and transmitted to the front side member upper 31 and the front side member lower 34 in a distributed manner. At this time, the dash cross member upper 14 whose center portion is curved downward is supported from the rear and the upper by horizontal end portions 14c formed at both ends thereof.

The vehicle body frame structure according to the present embodiment has the following effects. That is,
By adopting a configuration in which the receiving portion extends horizontally in the vehicle width direction, the dimensional error of the dash cross member upper can be absorbed. Therefore, the accuracy required at the time of assembly can be relaxed, the degree of dimensional freedom can be increased, and easy joining can be achieved.

  In addition, the dash cross member upper 14 that extends in the vehicle width direction and curves so that the center portion is directed downward is supported from the rear and the upper by the horizontal end portions 14c formed at both ends thereof. Increase strength.

  By providing the front side member upper 31 having the functions of the upper frame and the front side member above the central axis C of the front wheel W, and providing the front side member lower 34 having the functions of the chassis member and the front side member on the inside, The layout can be such that the front side member 36 does not pass between the center region of the front wheels W and the engine and transmission. Therefore, in addition to the upper frame and the chassis member, a front side member having a large cross-sectional area is arranged at the height of the central axis C of the front wheel W so as to extend in the vehicle front-rear direction, so that the front wheel W The turning angle at the time of maximum steering can be set large. Further, since the coupling portion 35 is Y-shaped and the front end portion of the front side member upper 31 and the front end portion of the front side member lower 34, whose center line of the cross section is shifted in the vehicle width direction, are coupled, The collision energy absorption performance at the time can be secured.

  In carrying out the present invention, it goes without saying that the constituent elements of the present invention, such as the specific shapes of the case members and the cross-sectional shapes of the various frame members, can be variously modified without departing from the spirit of the invention. Of course, various modifications can be made without departing from the scope of the present invention.

The perspective view which shows the vehicle body frame structure concerning one Embodiment of this invention. The top view which shows the same vehicle body frame structure. The front view which shows a part of the vehicle body frame structure. The front view which expands and shows the A section in FIG. 3 of the same vehicle body frame structure. The side view which shows a part of the vehicle body frame structure.

Explanation of symbols

1 ... frame structure, 11 ... front pillar upper, 12 ... front pillar,
14 ... Dash cross member upper, 14a ... Horizontal center part, 14b ... Inclined part,
14c ... Horizontal end, 14d ... Upper surface, 14e ... Rear side, 14f ... Corner, 14e ... Rear side,
16a ... Ceiling part, 16b ... Rear wall part, 16c ... Corner part, 17 ... Welded part, 20 ... Floor frame part, 21 ... Side sill, 22 ... Floor side member,
31 ... Upper front side member, 32 ... Spring house,
34 ... front side member lower, 35 ... coupling portion, 36 ... front side member.

Claims (4)

Front pillars arranged below the left and right front pillar uppers at the front of the vehicle body,
A cowl top extending in the vehicle width direction between the upper parts of the left and right front pillars;
A dash cross member upper having a closed cross-sectional shape extending in the vehicle width direction between the left and right front pillars;
A dash cross member lower extending in the vehicle width direction between the lower portions of the left and right front pillars;
With
The dash cross member upper is located below the cowl top and above the dash cross member lower,
The dash cross member upper includes a central portion extending in the vehicle width direction, an inclined portion extending inclined from the central portion in the left-right outer direction, and both end portions extending in the vehicle width direction on both sides via the inclined portion, respectively. Have
It has an outer surface that both vehicle transverse direction end portions of the dash cross member upper extends in a vehicle width direction,
Wherein the left and right front Pila, receiving portion having a receiving surface on which the outer surface extending in the vehicle width direction is joined is formed respectively,
The both end portions each have an upper surface extending in the vehicle width direction as the outer surface and a rear side surface extending in the vehicle width direction, and each includes corner portions extending in the vehicle width direction between the upper surface and the rear side surface,
The left and right front pillars have a ceiling portion extending in the vehicle width direction as the receiving surface and a rear wall portion extending downward from a rear end in the vehicle body traveling direction of the ceiling portion, and the ceiling portion and the rear wall portion With a corner that extends in the vehicle width direction,
The vehicle body frame characterized in that the corner portion is arranged at the corner portion, the upper surface is bonded to the ceiling portion, and the rear wall is bonded to the rear wall portion. Construction. The front pillar having the receiving portion is made of a die-cast material,
The dash cross member upper is composed of an extruded member having a closed cross-sectional shape with a hollow portion inside,
2. The vehicle body frame structure according to claim 1, wherein the receiving portion of the front pillar and the both ends in the vehicle width direction of the dash cross member upper have welded portions joined by welding.   The upper part of the dash cross member is formed by bending and deforming an extruded member having a closed cross-sectional shape with a hollow portion inside in a range in which the closed cross-sectional shape continues,
  The inclined portion extends from the central portion so as to be inclined upward and laterally outward,
  The both end portions are arranged above the central portion via the inclined portion,
  The shape of the receiving portion is configured to conform to the shape of the outer surface of the both end portions,
  2. The upper surface and the ceiling portion form a substantially horizontal plane, the rear side surface and the rear wall portion form a vertical surface, and the corner portion and the corner portion are configured at a substantially right angle. Body frame structure described. An upper member disposed in front of the passenger compartment, located above the central axis of the front wheel, and extending forward of the vehicle from the front pillar;
A lower member portion located below the central axis of the front wheel and extending forward of the vehicle from the front end portion of the floor;
A coupling part for coupling the upper member part and the lower member part in front of them;
A front member portion extending forward of the vehicle from the coupling portion;
The vehicle body frame structure according to claim 1, further comprising:

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