JPH0211255Y2 - - Google Patents

Description

[Detailed description of the invention] This invention maintains or increases the rigidity of the entire floorpan including the back bone, and reduces vibrations generated in the floorpan due to idling vibrations that occur when the engine is idling and running vibrations that occur when the vehicle is running. The present invention relates to a vehicle body floor structure that improves cabin comfort in the vehicle interior by reducing the interior comfort as much as possible.

Generally, in the floor pan structure used in so-called front-engine, front-drive types, there is no need to transmit the engine's driving force to the rear wheels, so there is no propeller shaft located below the backbone, and the exhaust pipe is There should be enough space to set it up. Therefore, the height of the back bone upward from the flat plate of the floor pan (that is, the height of the back bone) may be low, and it is also possible to make it this way in order to increase the living space in the vehicle interior. Required by design. Therefore, a reinforcement is provided on the lower surface of the back bone to reinforce the floor pan, but as the height of the back bone is lowered, it is necessary to increase the area of the closed cross section to compensate for the decrease in section modulus. Therefore, as the area of the closed cross section is increased, the recess on the lower surface of the back bone becomes smaller. However, the space for installing the exhaust pipe is reduced, and as a result, the exhaust pipe protrudes significantly downward from the bottom surface of the floor pan, resulting in a vehicle structure with a correspondingly small minimum height above the ground from the ground to the exhaust pipe.

The present invention has been devised in view of eliminating the above-mentioned drawbacks, and includes a backbone that projects upwardly and extends along the longitudinal center axis of the vehicle, and a backbone that extends from both sides of the backbone over the entire length of the backbone. In a front engine front drive type vehicle, the vehicle is equipped with a floor pan consisting of a flat plate-shaped portion extending in the width direction, and a reinforcement auster disposed along the entire length of the backbone and on the lower surface of the backbone. a main body part that is formed to have the same cross-sectional shape as the back bone along the vehicle width direction so as to be able to come into contact with the entire lower surface of the vehicle, and on which an exhaust pipe can be disposed downward; A space is formed between the groove and the flat plate portion, and the cross section along the vehicle width direction has a closed cross section. shape,
The floor pan is characterized in that the rigidity of the floor pan can be maintained through contact between the main body and the back bone. In the present invention, the main body of the reinforcement is brought into contact with the entire lower surface of the back bone, while the cross section in the vehicle width direction is Because the space has a closed cross-section along the longitudinal direction of the vehicle, the section modulus of the floorpan can be maintained, thereby minimizing floorpan vibrations caused by bending moments acting on the front and rear ends of the floorpan. It can achieve practical effects.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The floor pan 1 is attached to a front engine, front drive type vehicle, and is formed into a flat plate shape. Backbone 3
is formed to protrude upwardly along the longitudinal direction of the vehicle at the center of the floor pan 1, extends in the longitudinal direction of the vehicle which is the central axis in the longitudinal direction of the vehicle, and an exhaust pipe 2 is disposed in the back space. The reinforcement supports 4 are formed along the shape of the back bone 3 and abut on the back surface of the back bone 3 and extend in the longitudinal direction of the vehicle, and on both side edges of the main body, extending in the longitudinal direction of the vehicle and cooperating with the lower surface of the floor pan 1. and a groove-shaped portion forming a space 5 with a closed cross section. Therefore, in the above embodiment, the reinforcement 4 cooperates with the lower surface of the floor pan 1 to form a closed cross-sectional shape due to the space 5 extending in the longitudinal direction of the vehicle, and the section modulus of the floor pan is reduced by the contact between the main body and the backbone. Therefore,
The strength of the floor pan 1 is improved, and vibration or collision characteristics are not impaired.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a floor structure of a vehicle body showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the - line in FIG. 1. 1...Floor pan, 2...Exhaust pipe, 3...Back bone section, 4...Rin force.

Claims (1)

[Scope of utility model registration request] A floor pan consisting of a back bone that projects upwardly and extends along the central axis in the longitudinal direction of the vehicle, and a flat plate-shaped portion that extends in the vehicle width direction from both side edges of the back bone along the entire length of the back bone; In a front-engine, front-drive type vehicle that is equipped with a reinforcement abutment disposed along the entire length and on the lower surface thereof, the reinforcement aust has a cross section of the back bone along the vehicle width direction so as to be able to come into contact with the entire lower surface of the back bone. It consists of a main body part that is formed in the same shape as the main body part and on which an exhaust pipe can be disposed downward, and a groove part that is continuously formed from both side edges of the main part part and protrudes downward. A space whose cross section along the vehicle width direction forms a closed cross-sectional shape is formed between the flat plate portion and the rigidity of the floor pan due to the closed cross-sectional shape and the contact between the main body portion and the backbone. A vehicle body floor structure configured to maintain the following characteristics.