JP5292715B2 - Body frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body frame structure with high rigidity without disturbing shock absorbing performance. <P>SOLUTION: This vehicle body frame structure 1 comprises front pillar uppers 11 arranged on both right and left ends at a front part of a compartment and inclined so that a front portion is below a rear portion, front pillars 12 provided at bottom parts of the right and left front pillars 11, box parts 16 formed on the front pillars 12 and having rigidity against a force in a vehicle forward and backward direction smaller than that of other portions of the front pillars 12, and reinforcing ribs 17 provided to the box parts 16 and extending while the front portion is below the rear portion. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

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.

In the body frame structure, a technique for absorbing an impact from the front of the vehicle body by providing a fragile portion in a front frame arranged in front of the passenger compartment is known. With regard to the vehicle body frame structure having such a configuration, a reinforcing material is provided on the belt line of the front door, and the upper rear end portion of the front pillar has a high rigidity structure, and the reinforcing material is interposed between the upper front end portion of the front pillar. There has been provided a technique for providing a deformable portion having a lower strength (for example, Patent Document 1). In this frame structure, a load acting from the front of the vehicle is transmitted to the upper front end portion of the front pillar with the above configuration, and the impact energy is absorbed by the deformation of the deformable portion.
JP 2003-127898 A

  However, the above-described body frame structure has the following circumstances. That is, if a deformable portion having a low strength is provided to ensure high shock absorption performance, it becomes difficult to maintain the rigidity of the vehicle body.

  Therefore, an object of the present invention is to provide a highly rigid vehicle body frame structure without impeding impact absorption performance.

A vehicle body frame structure according to an embodiment of the present invention includes a front pillar upper that is disposed at both left and right ends of a front portion of a passenger compartment and that is inclined so that a front portion is below a rear portion, and the left and right front pillar uppers A front pillar provided at each lower portion, a deformable portion formed on the front pillar and configured to be less rigid with respect to a force in the longitudinal direction of the vehicle body than the other portions of the front pillar, and the deformable portion , e Bei and a reinforcing rib extending as lower than the rear portion to front portion,
The deformable part forms a gap and forms a box part made of a hollow structure part having a cross-sectional area that is smaller in a plane perpendicular to the longitudinal direction of the vehicle body than the other part of the front pillar.
The reinforcing rib is arranged from the front lower end portion to the rear upper end portion so as to obliquely cross the gap of the box portion, and the box portion is connected to the front of the front pillar. It is arrange | positioned in the back vicinity of the spring house of a part .

  A vehicle body frame structure according to an aspect of the present invention includes a left and right side sill that is disposed in a lower part of a vehicle compartment and extends in the front-rear direction from the left and right front pillars, and a left and right floor that extends in the front-rear direction inside the side sill. A floor frame portion having a side member; an upper member portion disposed in front of the passenger compartment, positioned above the center axis of the front wheel and extending forward of the vehicle from the front pillar; and a center axis of the front wheel A lower member portion that is positioned below and extends forward of the vehicle in front of the floor frame portion; and a front member portion that extends forward of the vehicle from a coupling portion where the upper member portion and the lower member portion are coupled in front of each other. A front frame part that is configured to extend from the upper ends of the left and right front pillars to the rear. To a Lumpur and configured roof portion between the left and right of the side roof rail and a roof rail extending in the vehicle width direction, comprising the.

  The vehicle body frame structure according to one aspect of the present invention is characterized in that the reinforcing rib is inclined obliquely in the same direction as the extending direction of the front pillar upper.

  According to the above configuration, the present invention can improve the rigidity of the vehicle body frame structure without hindering the impact absorbing performance.

  Hereinafter, a vehicle body frame structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. 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 FIG. 1, front pillar uppers that are inclined so that the front portion is disposed below the rear portion are provided at the left and right ends of the front portion of the passenger compartment. A cowl top 13 extending in the vehicle width direction is disposed 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 provided. ing. 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 fixed at the left and right horizontal end portions 14c below the box portion of the left and right front pillars 12 described later.

  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.

  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 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 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 front pillar 12 connecting the lower end of the dash cross member upper 14 and the end of the floor frame in the vehicle width direction is made of a light alloy casting such as an aluminum die-cast material. In the upper part and the front end portion of the front pillar 12, a box portion 16 is formed as a deformable portion, which is surrounded by a thin plate-like member having a gap 16a inside and forming a hollow structure portion. The box portion 16 as the hollow structure portion has a smaller cross-sectional area in the plane direction perpendicular to the longitudinal direction of the vehicle body than other portions of the front pillar 12, and is easily deformed by force in the longitudinal direction.

  Reinforcing ribs 17 are formed so as to cross the gap 16a inside the box portion 16 diagonally. The reinforcing rib 17 is formed in a thin plate shape extending in the same direction as the extending direction of the front pillar upper 11 with the front inclined downward, and extends from the front lower end portion of the box portion 16 to the rear upper end portion. It is arranged. The reinforcing rib 17 has a uniform cross section in the vehicle width direction and is integrally formed with the front pillar 12 that is a die-cast material. The reinforcing rib 17 can transmit the collision energy from the front to the front pillar 11 while ensuring the deformation tolerance by the force in the front-rear direction of the box portion 16. Further, the reinforcing rib 17 ensures rigidity against a vertical force.

  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 the forward and downward direction 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 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-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 actively crushing the shaft when the vehicle collides at a low speed, and preventing a portion behind the crash box 39 from being damaged.

  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.

  The upper end of the front pillar 11 is connected to a roof side rail 51 that extends in the vehicle longitudinal direction at the left and right ends of the vehicle body. Between the left and right roof side rails 51, a plurality of roof rails 52 such as a front roof rail and a rear roof rail extending in the vehicle width direction are suspended. The roof side rails 51 and the plurality of roof rails 52 are formed of an extruded member formed in an elongated shape from, for example, a light alloy lump such as an aluminum alloy. The cross-sectional shape of the roof side rails 51 and the plurality of roof rails 52 is, for example, a rectangular shape having a hollow portion. The cross section is continuous in the longitudinal direction. The roof side rail 51 and the roof rail 52 constitute a roof portion 50.

  In the frame structure 1 configured as described above, as indicated by an arrow in FIG. 4, the impact force input from the front part is distributed to the left and right by the front bumper beam 42 and is absorbed by the deformation of the crash box 39. It is 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. The energy input to the front side member upper 31 at the time of the collision is absorbed by the deformation of the box portion 16 and is transmitted to the rear upper end portion of the front pillar lower 12 and is transmitted to the roof portion 50 via the front pillar upper 11. It is transmitted to the floor frame portion 20 from the lower end portion of the front pillar 12. The load input to the front side member lower 34 is transmitted to the floor frame portion 20 such as the side sill 21 through the front pillar 12.

  The vehicle body frame structure according to the present embodiment has the following effects. By providing the reinforcing rib that obliquely crosses the box portion as the deformable portion, energy can be efficiently transmitted and the rigidity of the vehicle body can be improved without lowering the energy absorption efficiency at the time of collision. In other words, because the reinforcing ribs are thin and slanted, the cross-sectional area perpendicular to the front-rear direction is kept small, so that the deformation tolerance against the force from the front at the time of collision is ensured, so the shock absorbing performance Will not be damaged. Furthermore, since the rigidity against the vertical force is ensured by the reinforcing rib 17, for example, the vertical load from the dash cross member upper 14 attached to the lower surface of the front pillar 12 below the box portion 16 in the normal state, The rigidity of the front side member upper 31 connected to the front of the front pillar 12 against the load in the vertical direction from the spring house 32 or the like is improved.

  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 perspective view which expands and shows the A section in FIG. 1 of the vehicle body frame structure. The side view which shows the same 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, 15 ... Dash cross member lower, 16a ... Air gap,
16 ... Box part, 17 ... Reinforcing rib, 20 ... Floor frame part, 21 ... Side sill, 22 ... Floor side member, 30 ... Front frame part, 31 ... Front side member upper, 32 ... Spring house, 33 ... Fender shield panel, 34 ... Front side member lower, 50 ... Roof part, 51 ... Roof side rail, 52 ... Roof rail.

Claims (3)

A front pillar upper which is arranged at both left and right ends in the front part of the passenger compartment and which is inclined so that the front part is below the rear part;
Front pillars respectively provided at the lower part of the left and right front pillar uppers,
A deformable portion formed on the front pillar and configured to be less rigid with respect to a force in the longitudinal direction of the vehicle body than other portions of the front pillar;
A reinforcing rib provided on the deformable portion and extending as a front portion below a rear portion;
The deformable portion forms a gap and forms a box portion formed of a hollow structure portion configured such that a cross-sectional area of a surface perpendicular to a vehicle longitudinal direction is smaller than other portions of the front pillar. Is arranged from the front lower end portion to the rear upper end portion so as to obliquely cross the gap of the box portion, and the box portion is a spring of the upper member portion connected to the front of the front pillar. A vehicle body frame structure that is arranged near the rear of the house. A floor frame portion that is arranged at the lower part of the passenger compartment and includes left and right side sills extending from the left and right front pillars in the front-rear direction and left and right floor side members extending in the front-rear direction on the inner side in the vehicle width direction than the side sills. When,
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 front frame portion configured to have a lower member portion that extends, and a front member portion that extends forward of the vehicle from a coupling portion in which the upper member portion and the lower member portion are coupled in front of each other;
A roof portion that is arranged at the top of the vehicle body and includes a side roof rail that extends rearward from the upper ends of the left and right front pillars, and a roof rail that extends in the vehicle width direction between the left and right side roof rails;
The vehicle body frame structure according to claim 1, further comprising:   3. The vehicle body frame structure according to claim 1, wherein the reinforcing rib is inclined obliquely in the same direction as the extending direction of the front pillar upper.

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