Body stopper structure of a car

Abstract: A body stopper of a vehicle comprises stopper members (60) secured to frames (10), and gussets (70) secured to a floor panel (25) at the bottom of a cabin (20). Each gusset is secured with its upper end to the floor panel in confrontation with a seat cross member (26) and with its side surface to a side sill (24) under a door of the body, and configured to form a closed cross section in cooperation with the floor panel. Stopper members (60) are welded to the frames (10) at positions in front of the gussets, and each stopper member is configured to form a closed cross section in cooperation with the frame. A rearward impact to the front face of the vehicle is quickly transmitted from the frames to the body due to reliable engagement between the gussets and the stopper members. The gussets used as elements of the body stopper also behave to increase the rigidity of the body.

Description: BACKGROUND OF THE INVENTION Field of the Invention This invention relates to a body stopper structure for a vehicle for quickly transmitting an impact from the vehicle frame members to the body of the vehicle when the vehicle hits an object with its front face. Description of the Related Art For a vehicle having a body mounted on frame members to define a cabin, there is known a technique for quickly transmitting an impact from the frame members to the body upon hitting an object with the front face of the vehicle to ensure early constraint of passengers (for example, by early action of an air bag) and to decrease the relative displacement between the frame and the body for the purpose of preventing the interior space of the cabin from deformation by impact. The prior technique utilizes engagement between stoppers attached to the frame members (frame-side stopper brackets) and stoppers attached to the body or cabin (cabin-side stopper brackets) (see, for example, Japanese Patent Laid-Open No. 5-185952 (1993)). In a side view of one frame member taken from one side of the vehicle, a front portion of the frame member, in which a front wheel is installed, is bent upwardly and higher than the central part of the frame, in which cabin doors and a center pillar are located. This configuration of the frame members is necessary for installing wheels, and the bent portions are called frame members kick-up portions. When the frame members are subjected to a rearward impact at the front portions, the frame members are compressed and absorb the impact, resulting in great deformation at the kick-up portions. The cabin stoppers of the aforementioned Laid-open publication are mounted to kick-up portions of frame members Therefore, large deformation in the kick-up portions causes disengagement between frame-side stoppers and body-side stoppers, and often causes an increase in relative displacement between the frame members and the body and may increase deformation of the cabin SUMMARY OF THE INVENTION It is therefore an object of the invention to provide a body stopper structure for a vehicle, which can assure reliable transmission of an impact applied to the front face of the vehicle from the frame members to the body. According to the invention, there is provided a body stopper structure for a vehicle including a pair of frame members extending in the lengthwise direction of the vehicle, a body supported on the frame members, a floor panel forming the floor of the body, a seat cross member provided on the floor panel under front seats in the cabin, and side sills extending from both sides of the floor panel, said body stopper structure comprising: gussets, each secured both to a lower surface of the floor panel and to one of the side sills at a position corresponding to the seat cross member on the floor panel, and configured to have a closed cross section in cooperation with the floor panel; and stopper members, each secured to one of the frame members with a distance away from the front end of an associated gusset, and configured to have a closed cross section in cooperation with the associated frame member. Therefore, when the vehicle hits an object with its front face, the stopper members fixed at substantially non-deformable portions of the frame member near the seat cross member in the cabin other than the kick-up portions) securely engage with the gussets under the floor panel and securely transmit the impact from the frame member to the body. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagrammatic side view of a frame-supported vehicle using a body stopper structure according to the invention; Fig. 2 is a perspective view of the body stopper structure according to the invention; Fig. 3 is a perspective view of the body stopper structure according to the invention; Fig. 4 in a cross-sectional view taken along the A-A line of Fig. 2; and Fig. 5 is a cross-sectional view taken along the B-B line of Fig. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Below is a description on an embodiment of the invention with reference to the drawings. In the side view of Fig. 1, a vehicle 1 has a pair of frame members 10 and a body 20 mounted on the frame members by means of body mounts 30. As shown in Fig. 2, the floor of the body 20 of the vehicle 1 comprises a floor panel 25 and side sills 24 which are fixed to both sides of the floor panel 25 and gussets 70 to reinforce the floor panel 25. Each side sill 24 extends continuously from a center pillar 22 and, as shown in Fig. 4, has a box-like configuration comprising an outer member 24a and an inner member 24b. The upper end of the side sill 24 is welded to the floor panel 25 (see Fig. 4). Fixed on the upper surface of the floor panel 25 is a seat cross member 26 extending in the width direction for supporting front seats (not shown). The vehicle 1 shown above has a body stopper structure embodying the invention as described below. The body stopper structure 50 comprises the gussets 70, fixed to the lower surface of the floor panel 25, and a pair of stopper members 60, each stopper member secured to the outer side surface of an associated frame member 10. Although the gussets 70 have been used conventionally to reinforce the floor panel 25 of a vehicle, the present invention uses them as a component of the body stopper structure 50. For this purpose, the gussets 70 are configured to form a closed cross section when fixed to the floor panel 25 such that a greater rigidity is obtained. As shown in Figs.2-4, a gusset 70 is located under the floor panel 25 at a position corresponding to the seat cross member 26, with the upper surface 70a of the gusset 70 secured to the lower surface of the floor panel 25 by spot welding at spots W 2 , and with the side face 70b of the gusset 70 secured to the inner member 24b of the side sill 24 by spot welding as spots W 3 . The stopper member 60 has a box-like configuration as shown in Figs. 2 through 5, and it is secured to the outer side face of the frame 10 by CO 2 welding in front of and remote from the gusset 70 by a distance D 1 . The stopper member 60 also forms a closed cross section when fixed to the frame 10. Numeral 28 (Fig.4) denotes a door at one side of the body 20. The body stopper structure 50 having the above construction functions as explained below. When the vehicle 1 hits an object with its front face, a rearward impact F 2 is applied to the frame members 10 as shown in Fig. 5, and decelerates the frame members 10. However, the body 20 continues forward due to its inertial force. As a result, the gusset 70 moves into contact with the stopper 60 and transfers the impact from the frame members 10 to the body 20 quickly and securely. The reliable engagement between each frame member 10 and the body 20 is ensured because the stopper 60 on the frame member 10 is located in the straight-extended portion between front and rear kick-up portions 12 (more precisely, near the seat cross member 26). The body stopper structure 50 shown above can cope with a lateral impact to the vehicle as well. That is, when a lateral impact F 1 is applied to one side of the vehicle as shown in Fig. 4, since the integral structure of the side sills 24 and the floor panel 25 is reinforced by the gussets 70, and since the impact F 1 is resisted by engagement of the gussets 70 and the frame 10, depression of and serious damage to the cabin of the vehicle 1 by the impact F 1 can be minimized, and space for passengers can be secured. The body stopper structure 50 shown above has a further advantage given by the gussets 70 fixed under the seat cross member 26. That is, the gussets 70 increase the rigidity of the seat cross member 26 supporting the front seats and increase the rigidity of the entire floor panel 25. As described above, according to the invention, the location of the body stopper structure near the seat cross member assures quick, reliable transmission of an impact from the frame members to the body when the impact is applied to the front face of a vehicle. Moreover, the particular configuration of the gussets of the body stopper structure increases the rigidity of the seat cross member supporting the seats and the rigidity of the floor panel and the entire body, and therefore minimizes depression of the vehicle due to collision from the lateral direction so as to protect the cabin from serious damage. Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the scope of each element identified by way of example by such reference signs.

Claims: A body stopper structure (50) for a vehicle including a pair of frame members (10) extending in the lengthwise direction of the vehicle, a body (20) supported on the frame members, a floor panel (25) forming a floor of the body, a seat cross member (26) provided on the floor panel (25) and adapted to be positioned under front seats in a cabin of the vehicle, and side sills (24) extending along sides of the floor panel, said body stopper structure comprising: a plurality of gussets (70), each gusset secured both to a lower surface of the floor panel (25) and to one of the side sills (24) at a position corresponding to the seat cross member (26) on the floor panel, and each gusset configured to have a closed cross section in cooperation with the floor panel; and a plurality of stopper members (60) each stopper member secured to one of the frame members at a distance from the front end of one of the gussets, and each stopper member configured to have a closed cross section in cooperation with the associated frame member.

Inventors: SHIBATA AKINAO, SHIBATA, AKINAO, Shibata, Akinao, c/o Isuzu Motors Ltd.
Applicants: ISUZU MOTORS LTD, ISUZU MOTORS LIMITED
Application year: 1996
Main classification: B62D24
IPC codes: B62D21, B62D27, B62D24