JPH0616867Y2 - Lower car body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a front panel having a tunnel portion extending in the front-rear direction of a vehicle body by joining a rear end portion of a front panel and a front end portion of a rear panel. The present invention relates to a lower body structure of an automobile in which

(Prior Art) Conventionally, for example, as disclosed in Japanese Utility Model Laid-Open No. 62-8165, by joining a rear end portion of a front panel, which is a lower portion of a dash lower panel, and a front end portion of a rear panel in a superposed state. It is known that a floor panel of a vehicle body is formed. By the way, a large bending moment acts on the joint between the front panel and the rear panel due to the load input from the wheels of the vehicle body of the automobile. Therefore, the rear end portion of the front panel and the front end portion of the rear panel are overlapped over a predetermined width, and the overlapped portion is subjected to front and rear two-row spot welding to improve the rigidity of the joint portion and to prevent the bending. Although it is configured to withstand the moment, in this case, there is a problem that the weight of the vehicle body is increased and the manufacturing cost is increased because it is necessary to increase the polymerization amount of the joint portion. .

(Object of the Invention) The present invention has been made to solve the above problems, and improves the rigidity of the vehicle body against bending moments and the like without increasing the weight of the vehicle body or increasing the manufacturing cost. A lower vehicle body structure of an automobile is provided.

(Effect of the Invention) In the present invention, the floor panel is constructed by joining the rear end of the front panel and the front end of the rear panel.
In a lower vehicle body structure of an automobile in which a tunnel portion extending in the front-rear direction of the vehicle body is formed on the floor panel, at least one of the rear end portion of the front panel and the front end portion of the rear panel includes the tunnel portion. Is formed so as to project in the front-rear direction of the vehicle body, and a recess corresponding to the projection is formed on the other side, and the two panels are joined in a state where the projection and the recess are overlapped with each other. It was done.

According to the above configuration, at the joint between the rear end of the front panel and the front end of the rear panel, a protrusion and a recess are formed in which at least a portion of the floor panel including the tunnel portion protrudes in the front-rear direction of the vehicle body. As a result, a joint portion that is displaced in the front-rear direction and the vertical direction of the vehicle body is formed, and the section modulus for the bending moment that acts on this joint portion increases, and the rigidity of the vehicle body improves.

(Embodiment) FIG. 1 shows an embodiment of the lower body structure of an automobile according to the present invention, in which 1 is a front panel including the lower part of a dash lower panel, 2 is a rear panel, and 3 is a side sill. At the center of the front panel 1 and the rear panel 2 in the left-right direction, upwardly projecting tunnel portions 4 and 5 are formed in the front-rear direction of the vehicle body, and an exhaust gas purifying device 6 is disposed below the tunnel portions 4 and 5. It is configured to be.

At the front end of the rear panel 2, as shown in FIG.
A protrusion 7 is formed by the tunnel portion 5 and the left and right side portions thereof protruding forward over a predetermined range, and a temperature for detecting the temperature of the exhaust gas purification device 6 is formed on the side surface of the tunnel portion 5. An insertion hole 9 into which the sensor harness 8 is inserted is formed. In addition, a recess 10 corresponding to the protrusion 7 of the rear panel 2 is formed at the rear end of the front panel 1, and a bending piece 11 is formed on one side of the recess 10. The bending piece 11 constitutes a mounting bracket to which the holder 12 of the harness 8 is mounted. Then, as indicated by an imaginary line, the front end of the rear panel 2 is placed on the upper surface of the rear end of the front panel 1, and the projections 7 and the recesses 10 are overlapped with each other. The floor panel 13 of the vehicle body is formed by joining by means such as spot welding.

In this manner, the front panel of the rear panel 2 is provided with the projection 7 formed by projecting the portion including the tunnel section 5 forward, and the rear panel of the front panel 1 is provided with the recess 10 corresponding to the projection 7. Then, the rear end portion of the front panel 1 and the rear panel 2 in the state where the protrusion 7 and the recess 10 are overlapped with each other.
Since it is configured to be joined to the front end of the vehicle body by spot welding or the like, the vehicle body is displaced in the front-rear direction of the vehicle body along the projecting portion 7 and the recessed portion 10 and in the vertical direction of the vehicle body along the tunnel portions 4 and 5. A joint portion is formed. For this reason, the section modulus of the joint portion against the bending moment and the like caused by the loads input from the front and rear wheels is increased, and the rigidity of the vehicle body in this portion is improved. Moreover, as in the case of performing spot welding in the front and rear two rows, the front panel 1 and the rear panel 2 are joined together without increasing the amount of polymerization or increasing the welding man-hours. Since the strength can be improved, the vehicle body weight and the manufacturing cost can be reduced.

Further, in the above-described embodiment, the bent piece 11 is provided on one side of the recess 10 formed at the rear end of the front panel 1, and the bent piece 11 is used as a mounting bracket for the harness 8. Therefore, there is an advantage that the number of parts and the assembling process can be reduced as compared with the case where a separately formed mounting bracket is mounted on the lower surface of the front panel 1 or the like. Further, when the mounting bracket made of the bent piece 11 is provided on one side of the recess 10 as described above, the bent piece for the mounting bracket may be provided so as to project at the rear end of the front panel 1. There is an advantage that the material cost can be reduced as compared with the case. That is, as shown in FIG. 3, when the bent piece 11a constituting the mounting bracket is provided at the rear end of the front panel 1 in a protruding manner, the material within the range shown by the broken line 14 is required. When the bent piece 11 is formed on one side of the recess 10 as in the example, the material having the width A is unnecessary,
Material costs can be reduced.

In the above-described embodiment, the projection 7 projecting forward is formed at the front end of the rear panel 2 and the recess 10 corresponding to the projection 7 is formed at the rear end of the front panel 1. Instead of this, a structure may be adopted in which a projection protruding rearward of the vehicle body is formed at the rear end of the front panel 1 and a recess corresponding to the projection is formed at the front end of the rear panel 2. Further, the range of formation of the protrusions and recesses can be variously modified without being limited to the above-mentioned embodiment, and the protrusions and recesses are formed at least in the portion including the tunnel portions 4 and 5. If

(Effects of the Invention) As described above, according to the present invention, at least one of the rear end of the front panel and the front end of the rear panel forming the floor panel has a portion including at least the tunnel portion of the front panel projected in the front-rear direction of the vehicle body. In addition to forming the protrusion formed by the above, the other side is formed with a recess corresponding to the above protrusion, and the two panels are joined in a state where the protrusion and the recess are overlapped with each other, which increases the weight of the vehicle body. It is possible to increase the joint strength of both panels without increasing the number of welding man-hours and welding man-hours, and to improve the rigidity of the vehicle body against bending moments and the like caused by the load input from the wheels. There is an advantage that the input vibration can be effectively damped.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a lower body structure of an automobile according to the present invention, FIG. 2 is a plan view showing an exploded state of the lower body structure, and FIG. 3 is another embodiment of a front panel. It is a top view. 1 ... Front panel, 2 ... Rear panel, 4, 5 ...
Tunnel, 7 ... Projection, 10 ... Recess, 13 ... Floor panel.

Claims (1)

[Scope of utility model registration request] 1. A lower vehicle body of an automobile, wherein a floor panel is formed by joining a rear end portion of a front panel and a front end portion of a rear panel, and a tunnel portion extending in the front-rear direction of the vehicle body is formed on the floor panel. In structure,
At least one of the rear end portion of the front panel and the front end portion of the rear panel is formed with a projection formed by projecting at least a portion including the tunnel portion in the front-rear direction of the vehicle body, and at the other end, the projection. A recess corresponding to the part is formed,
A lower vehicle body structure for an automobile, characterized in that the panels are joined together in a state where the protrusion and the recess are overlapped.