JPH0621831Y2 - Lower car body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a lower body structure of an automobile.

(Prior Art) Generally, in a rear-wheel drive vehicle, a tunnel portion extending in the vehicle front-rear direction is formed in the center of the floor panel in the vehicle width direction, and a rear portion of the transmission and a drive shaft extending therefrom are passed under the tunnel portion. ing.
As a method of supporting the rear part of this transmission on the vehicle body side, transmission brackets are provided on both sides of the lower surface of the tunnel part to support the rear part of the transmission, and the vehicle width across the tunnel part on the upper surface side of the floor panel. There has already been proposed a method of arranging a mission reinforcement extending in a direction and connecting the mission reinforcement and the above-mentioned mission bracket with a floor panel interposed therebetween (Actual Publication No. Sho 59-43).
176).

By the way, as one method to increase the rigidity between the left and right side sills located on both sides of the floor panel,
A method of connecting the left and right side seals with each other by the above-mentioned mission reinforcement can be considered.

However, since the shift lever is attached to the rear part of the transmission, the rear part of the transmission is located obliquely in front of the seat and within a range within reach of the seat, so that the position of the position is relatively to the seat. Is set. Therefore, the transmission reinforcement extending in the vehicle width direction corresponding to the rear portion of the transmission is located at the position immediately in front of the seat, that is, at the foot position.
Therefore, for example, as described above, when the mission reinforcement is extended to the side sill to increase the rigidity between the side sills, the mission reinforcement is arranged at the foot of the floor panel. As a result, the vehicle cabin size (height) is reduced by the amount of the bulge of the force, which causes problems such as deterioration of comfort.

(Purpose of the Invention) In view of such a problem, the present invention aims to improve the rigidity between the side sills without sacrificing the size of the passenger compartment, and also to improve the rigidity of the shift lever mounting hole portion provided in the tunnel portion. The purpose of the invention is to propose a lower body structure of an automobile that can be improved.

(Means for Achieving the Purpose) In the present invention, as means for achieving the above-mentioned object, a substantially inverted U-shaped cross section extending in the vehicle front-rear direction is provided on a floor panel of an automobile.
Forming a V-shaped tunnel portion, providing shift lever mounting holes on the upper surface of the tunnel portion, and mounting transmission brackets for mounting the rear portion of the transmission on both sides of the lower surface of the tunnel portion, while shifting the upper surface of the floor panel A mission reinforcement that extends in the vehicle width direction across the tunnel portion is installed at a position closer to the front of the vehicle than the lever mounting hole, and the mission reinforcement is connected to the mission bracket with the floor panel sandwiched in the plate thickness direction. Further, on the upper surface of the floor panel and at a position substantially corresponding to the shift lever mounting hole in the front-rear direction of the vehicle body, one end of the vehicle body extends in the vehicle width direction and one end thereof is a side wall of the tunnel portion, and the other end is a vehicle body side portion. Cross members connected to the side sills that extend in the front-rear direction It is attached to, and the one end of said cross member characterized in that connected to the transmission bracket by sandwiching the floor panel in its thickness direction.

(Operation and Effect of Invention) In the present invention, the following operations and effects are obtained by the above means.

(1) A mission reinforcement arranged across the tunnel portion of the floor panel in the vehicle width direction and a pair of left and right cross members extending in the vehicle width direction from the left and right sides of the tunnel portion and connected to the left and right side sills. Since it is integrally connected in the vehicle width direction via a mission bracket arranged in the tunnel portion, the mission reinforcement, the left and right cross members, and the left and right side sills connected to the cross members are substantially H. -Shaped rigid body is formed, and even if the shift lever mounting hole is formed in the tunnel portion, the rigidity is improved between the left and right side sills by this H-shaped rigid body structure, and thus the entire vehicle body is extended. The rigidity is improved.

(2) Since the transmission brackets are arranged on both sides of the tunnel portion, the shift lever mounting holes provided in the tunnel portion are reinforced by the transmission brackets, and the shift lever mounting rigidity is maintained well.

(3) Since the mission reinforcement, which is arranged in the vehicle width direction while straddling the tunnel portion in the vehicle width direction, is arranged at the front position of the vehicle body with respect to the shift lever mounting hole formed in the tunnel portion, The displacement is off the front of the vehicle from the foot position of the occupant seated on the seat that is located on the rear side of the shift lever mounting hole, and is located on the side of the shift lever mounting hole. The cross member located in the vicinity is attached to the side wall of the tunnel portion without straddling the tunnel portion, and has a smaller upward protrusion amount than the mission reinforcement mounted over the tunnel portion,
For these reasons, the foot reinforcement of the occupant is not narrowed by the mission reinforcement or the cross member, and this can be sufficiently secured, and the habitability in the vehicle compartment is further improved.

(4) Since the shift lever mounting hole provided in the tunnel portion is deviated in the front-rear direction of the vehicle body with respect to the mission reinforcement arranged across the tunnel portion, the shift lever is provided with the shift lever. The position where the mounting hole is formed is not restricted, and the position of the shift lever mounting hole can be set relatively freely from the viewpoint of operability of the shift lever by an occupant.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1 and 2 show a front seat side portion of a vehicle compartment front portion of an automobile having a lower vehicle body structure according to an embodiment of the present invention, in which reference numeral 1 is a floor panel. At the center of the floor panel 1 in the vehicle width direction, there is formed a tunnel portion 10 having a substantially inverted U-shaped cross section, which bulges toward the upper surface, in the vehicle longitudinal direction. Further, side sills 5 and 5 having a closed cross section are attached to both side edges of the floor panel 1 in the vehicle front-rear direction. Further, a floor frame 4 having a hat-shaped cross section is mounted on the upper surface of the floor panel 1 and between the tunnel portion 10 and the left and right side sills 5, 5 in the vehicle front-rear direction.

In addition, a shift lever mounting hole 1 provided in the tunnel portion 10 on the upper surface of the floor panel 1 and in the vehicle longitudinal direction.
The cross member 3 having a hat-shaped cross section that extends in the vehicle width direction across the floor frame 4 from the bulging portion 11 provided on the side wall 12 of the tunnel portion 10 and reaches the side sill 5 at both left and right positions substantially corresponding to 3 respectively. , 3 are attached.

On the other hand, inside the tunnel portion 10, a rear portion of the transmission and a drive shaft extending rearward from the vehicle body are arranged. And this tunnel part 10
The transmission brackets 6, 6 for supporting the rear portion of the transmission are provided on the inner surfaces of the pair of left and right bulging portions 11, 11 formed on the side wall 12 of the vehicle and at positions displaced from the shift lever mounting hole 13 in the vehicle front-rear direction. Are fixed respectively. The transmission bracket 6 is integrally formed by pressing a thick plate material, and has a transmission supporting portion 6a having a bolt hole and an extending portion 6b extending continuously from the transmission supporting portion 6a. There is. And this mission bracket 6
With the transmission support portion 6a facing the vehicle body front side and the extending portion 6b facing the vehicle body rear side, and the extending portion 6b corresponding to the one end 3a of the cross member 3, It is welded and fixed to the inner surface.

Further, at a position on the upper surface of the floor panel 1 and on the front side of the vehicle body with respect to the cross member 3, a hat-shaped cross section is provided from the viewpoint of preventing narrow deformation of the tunnel portion 10 due to the supporting load of the transmission and increasing its supporting rigidity. The mission reinforcement 2 it has is attached across the tunnel 10 in the vehicle width direction. And this mission reinforcement 2
Connects both ends 2a, 2a thereof to the floor frames 4, 4 on the corresponding sides, and
The first portion is made to correspond to the transmission support portion 6a of the transmission bracket 6.

By arranging the mission reinforcement 2 in this way, as shown in FIGS. 1 and 3, the mission reinforcement 2 and the cross member 3 are integrated through the mission bracket 6 at the bulging portion 11 part. Are linked together. Therefore, when seen in a plan view, the pair of left and right side sills 5, 5 are integrally connected to each other in the vehicle width direction via the pair of left and right cross members 3, 3 through the mission reinforcement 2 to form a substantially H-shaped rigid frame. Therefore, even if the tunnel portion 10 is provided with the shift lever mounting hole 13 that contributes to the reduction in rigidity thereof, the existence of the shift lever mounting hole 13 is affected by the substantially H-shaped rigid frame structure. The rigidity between the pair of left and right side sills 5, 5 is improved without being damaged.

In addition, the front end of the seat in the front-rear direction of the vehicle body has a shift lever mounting hole 1 in consideration of the operability of the shift lever.
Since it is arranged so as to substantially correspond to 3, the mission reinforcement 2 arranged in a state of protruding upward from the floor panel 1 is provided at a position immediately in front of the cross member 3 which is a foot space of an occupant seated on the seat. Since it does not exist, a sufficient space for the feet can be secured, and the habitability in the vehicle interior can be maintained well.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a floor panel portion of an automobile having a lower body structure according to an embodiment of the present invention, FIG. 2 is a view looking up from an arrow II direction in FIG. 1, and FIG. III-I in the figure
FIG. 2 is a vertical sectional view of a main part of II. 1 …… Floor panel 2 …… Mission reinforcement 3 …… Cross member 4 …… Floor frame 5 …… Side sill 6 …… Mission bracket 10 …… Tunnel part 11 …… Swelling part 12 …… Sidewall 13 …… Shift Lever mounting hole

Claims (1)

[Scope of utility model registration request] 1. A tunnel panel having an approximately U-shaped cross section extending in the vehicle front-rear direction is formed on a floor panel of an automobile, shift lever mounting holes are provided on an upper surface of the tunnel portion, and both sides of a lower surface of the tunnel portion are formed. While mounting the transmission bracket for mounting the rear part of the transmission, at the same time as mounting the mission rain force extending in the vehicle width direction across the tunnel part at a position in front of the shift lever mounting hole on the upper surface of the floor panel, The reinforcement is connected to the mission bracket by sandwiching the floor panel in the plate thickness direction, and further extends in the vehicle width direction on the upper surface of the floor panel and at a position substantially corresponding to the shift lever mounting hole in the vehicle longitudinal direction. One end is on the side wall of the tunnel part and the other end is on both sides of the vehicle body. Is attached to the side sill extending in the front-rear direction of the vehicle body, and the one end side of the cross member is connected to the mission bracket with the floor panel sandwiched in the plate thickness direction. Lower body structure.