JPH0423748Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a front body structure of an automobile in which a rear end portion of a subframe that supports an engine is attached to the lower surface of a cross member.

(Prior art) As a structure for attaching a subframe supporting an engine to a cross member, for example,
There is one shown in Publication No. 121172. In this structure, the cross member is connected to the lower end of the dash panel that partitions the passenger compartment and the engine room to form a closed section, and a reinforcement is provided to partition the closed section into upper and lower sections. This is made by joining the floor frame to the floor frame.

This structure has recently attracted attention and is widely used because it allows the frontal collision load of the vehicle to be borne by the vehicle body constituent materials, thereby alleviating the transmission of the impact to the passenger compartment side.

However, when attaching the subframe that supports the engine to the cross member, engine vibration causes the subframe to displace vertically, and the cross member receives the load due to this displacement. In a structure in which the cross member is supported by a cross member, the burden on the cross member is large, and it cannot be said that it is preferable in terms of strength.

As a countermeasure against this problem, a mounting bracket is generally provided at the portion of the cross member to which the subframe is attached. but,
When the bracket is provided in this manner, the mounting portion can be reinforced, but the load is still not distributed to parts other than the cross member, and the burden on the cross member is not reduced. Moreover, if more extensive reinforcement is performed, it will be difficult to avoid an increase in vehicle weight and cost.

Therefore, it has been desired to disperse the load that the cross member receives from the subframe to the vehicle body panel with a simple structure that does not include unnecessary reinforcing members.

(Purpose of the invention) In response to the above-mentioned needs, the present invention has developed a front body structure for an automobile that has a simple structure without unnecessary reinforcing members and can disperse the load received from the subframe to the cross member to the body panel. The purpose is to provide.

(Structure of the invention) The invention connects a cross member extending in the lateral direction of the car body to the car body panel to form a closed cross section, and attaches the rear end of the subframe that supports the engine to the lower surface of the cross member. In the front body structure of an automobile, the vehicle body panel, the cross member, and the part of the subframe to be attached to the cross member are penetrated in the vertical direction, and the subframe is cross-shaped by tightening these from both the upper and lower outer sides. a mounting bracket that is provided on the upper surface of a portion of the cross member through which the fastener penetrates and has a through hole through which the fastener passes and a flange portion that extends upward; The flange portion of this mounting bracket is connected and fixed to the vehicle body panel.

In the above configuration, the mounting bracket provided on the top surface of the cross member reinforces the part where the rear end of the subframe is attached, especially the part that passes through the fastener.At the same time, the flange of this bracket By connecting and fixing the subframe to the vehicle body panel, the load received from the subframe is distributed to the vehicle body panel.

(Example) An example of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view taken along the line -- in FIG. 2, and FIG. 2 is a front view of the main parts of this embodiment as seen from inside the vehicle.

In these figures, 1 is a dash panel lower, and the lower end of this dash panel lower 1 is joined to a floor panel 2. Both left and right ends of the lower darts panel are joined to side shells (not shown), which separate the engine room 3 and the vehicle compartment 4. In addition, in FIG. 1, 5 is a floor frame, and 6 is a front frame.

The lower part of the darth panel lower 1 is bent toward the passenger compartment 4 side, forming a diagonal portion 1a. A cross member 8 having a substantially L-shaped cross section and extending in the lateral direction of the vehicle body as a whole is connected to the engine room 3 side of this diagonal portion 1a with a reinforcement 7 interposed therebetween. This cross member 8 has a recess 8a at both left and right ends, and the bottom 8 of this recess 8a
A diagonal piece 8c is formed at the end of b further toward the compartment 4. On the other hand, the reinforcement 7 consists of a vertical part 7a and a horizontal part 7b, and the end of the horizontal part 7b is bent downward to form a joint part 7c. This joint portion 7c is fixed by being sandwiched between the diagonal portion 1a of the darth panel lower 1 and the diagonal piece 8c of the cross member 8.
a is fixed to the inner surface of the cross member 8 with bolts 10, 10. In other words, the reinforcement 7 separates the closed cross section formed by the darth panel lower 1 and the cross member 8 into upper and lower sections, and the reinforcement 7 and the depression of the cross member 8 further divide the closed cross section into upper and lower sections. It forms A.

A rear end portion of a subframe 9 that supports an engine (not shown) is attached to the lower surface of the cross member 8. In this mounting part, mounting holes are provided in the horizontal part 7b of the reinforcement 7, the bottom part 8b of the darth panel lower 8, and the upper surface of the subframe 9, and bolts (constituting fasteners) 11 are provided in these. is passed through, its head 12 is fixed to the upper surface of the reinforcement 7, and it is tightened from inside the subframe 9 with a nut 13 (constituting a fastener).

In addition, a mounting bracket 14 is provided on the upper surface of the bottom portion 8b of the cross member 8 for reinforcing the mounting portion of the subframe 9. This bracket 14 is formed into a box shape that opens upward, and the wall located at the front of the vehicle body has an inclined surface 14a that comes into contact with the recess 8a of the dash panel lower 8.
have. Further, on the bottom thereof, there are two holes that match the mounting holes provided in the bottom 8b of the cross member 8.
A hollow cylindrical protrusion 14b is formed on the top surface of the bottom to fit each of the through holes. Then, the bracket 14 is attached to the bottom portion 8b by aligning the through hole of the bracket 14 with the mounting hole of the cross member 8.
The subframe 9 is attached by passing the bolt 11 through the protrusion 14b as shown in FIG.

Furthermore, in the present invention, the bracket 14
Flange portions 14c and 14d extending upward are formed on both left and right sides. These flange parts 1
4c and 14d are formed so as to abut on the lower surface of the reinforcement 7, respectively, as shown in FIG. The connection is fixed.

According to such a configuration, the bracket 14
Since the flange portion 14a of the cross member 8 is connected and fixed to the reinforcement 7, the load that the cross member 8 receives from the subframe 9 due to engine vibration etc. can be dispersed to the reinforcement 7 through the bracket 14. The burden on the cross member 8 can be reduced.

Note that the structure of the vehicle body panel to which the present invention is applied is not limited to the above embodiment. For example, as shown in FIG. In the structure in which a closed cross section is formed, the above-mentioned bracket 1 is attached to the horizontal portion 1b of the lower dash panel 1.
By connecting and fixing the flange portions 14c and 14d of 4, the load can be distributed to the dash panel lower 1 in the same manner as described above.

(Effects of the invention) As described above, the present invention reduces the load that the cross member receives from the subframe by using the mounting bracket provided at the mounting part of the subframe, more specifically, at the part where the fasteners penetrate the subframe. Since it is dispersed in the vehicle body panel, the load on the cross member can be reduced and the strength can be made more favorable. Furthermore, since a mounting bracket is used to reinforce the mounting portion, there is no need to use a new reinforcing member, and no increase in weight or cost of the automobile will occur due to reinforcement.

[Brief explanation of drawings]

Fig. 1 is a sectional view taken along the line - - in Fig. 2, Fig. 2 is a front view of the main parts of the cross member according to an embodiment of the present invention as seen from the passenger compartment, and Fig. 3 is a perspective view of the mounting bracket in the same embodiment. 4 are vertical sectional views showing essential parts in another embodiment. 1... Dash panel lower (vehicle body panel), 7
...Reinforcement (car body panel), 8...
...Cross member, 9...Subframe, 11...
Bolt (constituting a fastener), 12... Nut (constituting a fastener), 14... Mounting bracket, 14c,
14d...Flange part, A...Closed cross section.

Claims (1)

[Claims for Utility Model Registration] 1. A cross member extending in the lateral direction of the vehicle body is connected to the vehicle body panel to form a closed cross section, and a rear end portion of a subframe that supports the engine is attached to the lower surface of the cross member. In the front body structure of an automobile, the vehicle body panel, the cross member, and the part of the subframe to be attached to the cross member are penetrated in the vertical direction, and the subframe is cross-shaped by tightening these from both the upper and lower outer sides. a mounting bracket that is provided on the upper surface of a portion of the cross member through which the fastener penetrates and has a through hole through which the fastener passes and a flange portion that extends upward; A front body structure for an automobile, characterized in that a flange portion of the mounting bracket is connected and fixed to the body panel. 2 The vehicle body panel is constituted by a reinforcement that partitions the closed cross section formed by the darth panel lower and the cross member into upper and lower parts and forms a closed cross section between the cross member and the reinforcement. The utility model registration claim is characterized in that a fastener is passed through a cross member and a portion of the subframe that is attached to the cross member, and a flange portion of the mounting bracket is connected and fixed to the lower surface of the reinforcement. A front body structure of an automobile according to scope 1.