JP5026136B2 - 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 vehicle 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 Patent Document 1, for example). 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 that the front wheel can enter the vehicle width direction inner side than the front member portion in consideration of the improvement of the collision energy absorption performance and the steering angle. There has been provided a technique for forming a space so that a front member portion does not pass between a central region and an engine and a transmission (see, for example, Patent Document 2). The vehicle body frame structure is located above the center axis of the front wheel and extends from the front pillar lower to the front of the vehicle, and the lower member portion is located below the center axis of the front wheel and extends from the front end of the floor to the front of the vehicle. A coupling portion coupled in front of the front wheel, and a front member portion extending forward of the vehicle from the coupling portion. In such a vehicle body frame structure, the force input from the front of the vehicle body in the event of a collision or the like is distributed and input from the left and right front member portions to the upper member portion and the lower member portion.
Japanese Patent No. 2890938 JP 2006-143178 A

  However, the above-described body frame structure has the following circumstances. In other words, since various forces in the vertical direction are input to the vehicle body in addition to the collision from the front, it is required to satisfy both the rigidity against the force in the vertical direction of the vehicle and the energy absorption efficiency from the front in the collision and the like. It is done.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a frame structure that increases the rigidity of a vehicle body against a vertical force while maintaining energy absorption efficiency from the front due to a collision or the like.

A vehicle body frame structure according to an embodiment of the present invention includes a left and right side sill that is disposed in a lower part of a vehicle compartment and extends from a front pillar disposed at both ends of the vehicle width direction to the rear of the vehicle body, and a vehicle body on the vehicle width direction inner side than the side sill A floor frame portion having left and right floor side members extending in the front-rear direction, and an upper member portion disposed in front of the passenger compartment and positioned above the center axis of the front wheel and extending forward of the vehicle from the front pillar. And a lower member portion that is positioned below the center axis of the front wheel and extends forward of the vehicle in front of the floor frame portion, and a joint portion in which the upper member portion and the lower member portion are coupled in front of these. Front comprising a front member portion extending and a dash cross member upper extending in the vehicle width direction between the left and right front pillars A ram part, a front side member rear connecting the front end part of the floor side member and the upper member part behind the front member part, and extending in the vehicle body vertical direction, connecting the front side member rear and the dash cross member upper. The upper part of the dash cross member upper, and a central part extending horizontally from side to side in the center in the vehicle width direction, and an inclined part extending upward and laterally outward from the left and right ends of the central part. And left and right end portions extending horizontally outward from the left and right end portions of the left and right inclined portions, and the front side member rear includes a front portion extending horizontally rearward from the front side member upper portion. An oblique intermediate portion extending obliquely from the front portion toward the rear downward direction and the vehicle width inside, and the oblique intermediate portion A rear portion extending rearwardly from the rear end and extending substantially horizontally toward the inner side of the vehicle width, and the connecting member is provided near the lower end of the inclined portion of the dash cross member upper and the front side member rear. The vicinity of the upper end of the oblique middle part is connected .

  In the vehicle body frame structure according to one aspect of the present invention, the connecting member is configured by integrally including a plurality of plate-like members facing different directions, and a lower end portion thereof is joined to the front side member rear and an upper end thereof. The portion is joined to the upper part of the dash cross member.

  In the vehicle body frame structure according to one aspect of the present invention, a spring house is integrally formed with the front pillar, and a front end portion of the front member rear is joined to the lower side of the spring house on the rear side of the extension line of the front member portion. It is characterized by.

  According to the present invention, the rigidity of the vehicle body against the force in the vertical direction can be increased while maintaining the energy absorption efficiency from the front due to a collision or the like.

  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. Also, the description of the same configuration on the left and right is omitted as appropriate.

  FIG. 1 shows a part of a body frame structure of an automobile (vehicle) according to the present embodiment. As shown in FIGS. 1, 2, and 3, a cowl top 13 extending in the vehicle width direction is provided between the left and right front pillars 12 respectively formed at the lower portions of the left and right front pillar uppers 11, and A dash cross member upper 14 and a dash cross member lower 15 are installed. 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 and is curved so that the central portion in the vehicle width direction is downward. The dash cross member upper 14 has a horizontal central portion 14a extending horizontally left and right at the center in the vehicle width direction, and an inclination extending obliquely upward and laterally outward from the left and right ends of the horizontal central portion 14a via gentle curves. Part 14b and a horizontal end part 14c extending horizontally from the left and right end parts of the left and right inclined parts 14b to the outside in the vehicle width direction through a gentle curve. The dash cross member upper 14 is attached to the left and right front pillars 12 at the left and right horizontal ends 14c.

  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. The inner end surface 15a of the dash cross member lower 15 forms a slope that faces inward from the front to the rear. Note that the end surface of the hollow member refers to the end surface of the outer peripheral portion around the hollow portion.

  Side sills 21 extend from the lower portions of the left and right front pillars 12 toward the rear of the vehicle body. The rear end of the side sill 21 is positioned in front of the rear wheel (not shown). Inside the side sill 21, the floor side member 22 is connected to the inner end of the dash cross member lower 15 and extends toward the rear of the vehicle body. 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 outer end surfaces of the dash cross member lower 15 and the various cross members 24, 25, and 26 are joined to the inner wall surfaces 21a of the left and right side sills 21 by welding or the like.

  The rear end portions of the floor side member 22 and the backbone 23 are joined to a cross member 26 disposed in front of the rear wheel. The lower surfaces of the various cross members 24, 25 and 26 and the upper surface of the floor side member 22 are joined by welding or the like at the intersecting portions. Further, the inner end surfaces of the cross members 24 and 25 are connected to the backbone 23 via the backbone side panel 27.

  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 by welding or the like.

  The various frame materials 13-15, 21-26, 36, 42, etc. constituting the floor frame portion 20 and the front frame portion 30 described later are formed by extrusion from a light alloy lump such as an aluminum alloy, for example. It consists of a member, and the cross-sectional shape is formed in, 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 an aluminum die cast material. 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 toward the front and downward of the vehicle body 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. The front side member upper 31 is made of a light alloy casting such as an aluminum die-cast material. A spring house 32 is integrally formed on the inner surface of the rear portion of the front side member upper 31 so as to protrude toward the inside of the vehicle body to form a protruding portion. A fender shield panel 33 protrudes inward and is integrally formed on the inner side surface of the front side member upper 31 in front of and below the spring house 32 to constitute a protruding portion.

  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-weight material such as an aluminum die-cast material so that the left and right vehicle body front extending portions 34a are curved inward in the vehicle width direction and are connected at portions close to each other. It is integrally formed with an alloy 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.

  Between the rear part of the front side member upper 31 and the front end part of the floor side member 22, a front side member rear 50 is provided as a connecting member for connecting the two. The front side member rear 50 has a horizontal front portion (front portion) 51 extending substantially horizontally rearward from the front side member upper 31 and a slanting rear lower direction and a vehicle width direction through a gentle curve downward from the horizontal front portion 51. An oblique intermediate portion (intermediate portion) 52 extending inward and a horizontal rear portion (rear portion) 53 extending rearward and horizontally inward in the vehicle width direction from the rear end of the oblique intermediate portion 52 are continuous. Are integrally formed. The front side member rear 50 is obtained by extrusion molding of a light alloy lump such as an aluminum alloy. For example, the front side member rear 50 is formed of an elongated extruded member having a hollow section (closed section shape) having a rectangular hollow portion in the longitudinal direction, and has a constant closed section shape. Is configured to be bent within a continuous range.

  The horizontal front portion 51 is disposed at the same position as the front side member 36 in the vehicle width direction and the height direction, and extends in the front-rear direction so as to continue on the extension line of the front side member 36 via the front side member upper 31. . The front end surface 51a of the horizontal front portion 51 is joined to the rear side wall surface 33a of the fender shield panel 33 as a protruding portion protruding inward from the front side member upper. An outer wall surface 51b of the horizontal front portion 51 is formed so as to follow the shape of the inner wall surface 31a of the rear end portion of the front side member upper 31, and is welded to the lower side of the spring house 32 and behind the fender shield panel 33 by welding. It is joined to the inner wall surface 31 a of the member upper 31.

  The front side member rear 50 and the dash cross member upper 14 are connected by a connecting member 60. The connecting member 60 is made of an aluminum extruded material and extends in the vertical direction. The lower end portion 61 of the connecting member 60 is joined to the vicinity of the upper end of the oblique intermediate portion 52 of the front side member rear 50, and the upper end portion 62 of the connecting member 60 is joined to the vicinity of the lower end of the oblique portion 14b of the dash cross member upper 14. ing. The connecting member 60 is integrally formed with a front plate-like member 63 whose width direction is along the vehicle width direction, and an outer plate-like member 64 whose width direction is along the vehicle body front-rear direction. Has been.

  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 and is transmitted to the floor side member 22 through the front side member rear 50. At this time, the impact energy is absorbed by the buckling deformation of the front side member rear 50 formed of the integrally formed extruded material. At this time, the front side member rear 50 is supported in the vertical direction by the connecting member 60. Further, when the front side member rear 50 is deformed by the force in the front-rear direction, the connecting member 60 is also deformed.

The vehicle body frame structure 1 according to the present embodiment has the following effects. That is,
Since the front side member rear 50 and the dash cross member upper 14 are connected by the connecting member 60 extending vertically, deformation of the front member rear 50 in the vertical direction is restricted, and rigidity in the vertical direction of the vehicle body is improved.

  Therefore, when a force is input due to a collision, the front side member rear 50 is buckled and deformed in the front-rear direction, so that the collision energy can be efficiently absorbed and the collision energy is transferred from the front side member rear 50 to the rear floor side member 22. Is transmitted efficiently.

  Further, since the connecting member 60 is configured to extend in the vertical direction and can be bent and deformed by a force from the front, when the front side member rear 50 absorbs energy while buckling and deforming by a force from the front, By deforming the connecting member 60 as well, high absorption efficiency can be maintained without hindering absorption of collision energy.

  Further, since the connecting member 60 is provided with a front plate member 63 and an outer plate member 64 in different directions, and is formed in an L-shaped cross section, it is easily deformed by the force in the front-rear direction, and the efficiency of shock absorption Will improve. For example, the vertical movement of the spring house 32 can be supported by the dash cross member upper 14 via the front side member rear 50 and the connecting member 60 joined to the lower end thereof.

  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. For example, the connecting member has been exemplified for the case where the cross section is L-shaped, but is not limited thereto, and the cross section may be formed in a T shape or a hollow shape having a hollow portion. May be composed of a single plate-like member. 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 side view which shows the same vehicle body frame structure. The perspective view which expands and shows the A section in FIG. 1 of the vehicle body frame structure. The perspective view which shows the connection member in the vehicle body frame structure.

Explanation of symbols

1 ... body frame structure, 11 ... front pillar upper, 12 ... front pillar,
13 ... Cowl top, 14 ... Dash cross member upper, 14a ... Horizontal center,
14b ... inclined portion, 14c ... horizontal end portion, 15 ... dash cross member lower,
15a ... inner end face, 20 ... floor frame part, 21 ... side sill,
21a ... inner wall surface, 22 ... floor side member, 30 ... front frame part,
31 ... Front side member upper, 31a ... Inner wall surface, 32 ... Spring house,
33 ... Fender shield panel, 33a ... Rear side wall surface, 34 ... Front side member lower 34a ... Body front extension part, 35 ... Coupling part, 36 ... Front side member,
50 ... Front side member rear, 51 ... Horizontal front part, 51a ... Front end surface, 51b ... Outer wall surface,
52 ... Oblique middle part, 53 ... Horizontal rear part, 60 ... Connecting member, 61 ... Lower end part, 62 ... Upper end part,
63, 64: plate-like members.

Claims (3)

Left and right side sills that are arranged at the lower part of the passenger compartment and extend from the front pillars arranged at both ends in the vehicle width direction to the rear of the vehicle body, and left and right floor side members that extend in the vehicle longitudinal direction on the inner side in the vehicle width direction than the side sills, A floor frame portion configured to have,
An upper member portion that is disposed in front of the passenger compartment, is located above the center axis of the front wheel, extends forward of the vehicle from the front pillar, and is located below the center axis of the front wheel, and forward of the vehicle in front of the floor frame portion. A lower member portion extending, a left and right front member portion extending forward of the vehicle from a joint portion where the upper member portion and the lower member portion are coupled in front of each other, and a dash cross extending in the vehicle width direction between the left and right front pillars A front frame portion configured to have a member upper;
A front side member rear connecting the front end portion of the floor side member and the upper member portion behind the front member portion;
A connecting member that extends in a vehicle body vertical direction and connects the front side member rear and the dash cross member upper ;
The dash cross member upper includes a central portion that extends substantially horizontally to the left and right at the center in the vehicle width direction, an inclined portion that extends upward and laterally outward from both left and right ends of the central portion, and left and right inclined portions. The left and right ends that extend substantially horizontally from the left and right ends toward the outside in the vehicle width direction are integrally provided,
The front side member rear includes a front portion horizontally extending rearward from the front side member upper portion, a slant intermediate portion extending rearwardly from the front portion and obliquely toward the vehicle width inside, and a rear portion of the slant intermediate portion. A rear portion extending rearward from the end and extending substantially horizontally toward the vehicle width inside;
The vehicle body frame structure characterized in that the connecting member connects the vicinity of the lower end of the inclined portion of the upper part of the dash cross member and the vicinity of the upper end of the oblique intermediate portion of the rear of the front side member .   The connecting member is configured integrally with a plurality of plate-like members facing different directions, and a lower end portion thereof is joined to the front side member rear and an upper end portion thereof is joined to the dash cross member upper. The vehicle body frame structure according to claim 1. Wherein the front Pila Spring House is integrally formed with the front end portion of the front side member rear is according to claim 2, characterized in that it is joined to the lower of the Spring House in extension on the rear of the front member portion Body frame structure.

Images