JPH0674579U - Car floor reinforcement structure - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the reduction in rigidity near the tunnel part provided in the center of the floor and prevent the floor from twisting and deforming when subjected to bending vibration of the body frame. And is particularly suitable for resin floors. [Structure] A connecting member 4 is disposed on the lower surface of a tunnel portion 2 provided in a substantially central portion of a floor 1 so as to straddle an opening of the tunnel portion 2, and a floor fixing portion 9a of the connecting member 4 is provided. Vehicle body skeletons 11a, 11b, 13a, 13b located respectively in front of and behind 9b, 10a, 10b
Of high rigidity and the floor fixing portions 9a, 9 of the connecting member 4
b, 10a, 10b and reinforcing members 12a, 12b, 14
It was connected by a and 14b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a floor reinforcement structure for an automobile, and more particularly to a floor reinforcement structure for an automobile provided with a tunnel portion projecting toward the vehicle interior side in a substantially central portion of the floor.

[0002]

[Prior art]

 In recent years, there has been a demand for weight reduction of vehicle bodies in order to reduce fuel consumption and improve vehicle performance, and there are some that use resin materials for structural members of vehicle bodies. For example, a resin floor that takes advantage of the damping performance of resin is one example. As an example of the resin floor, as shown in FIG. 11, the entire floor 1 including the tunnel portion 2 or at least the flat surface portion 3 of the floor 1 is carbon fiber, aramid fiber, glass fiber on both sides of the core material such as urethane or honeycomb. The sandwich structure is made by sandwiching it between the surface layers of fiber-reinforced plastics such as fiber and has a high rigidity to suppress the local membrane vibration of the floor, which is a cause of high-speed muffled noise. In the figure, reference numeral 4 is a rear engine mount bracket arranged across the lower surface opening 6 of the tunnel portion 2, and 5 is a center bearing bracket.

However, although the resin floor having such a sandwich structure has improved out-of-plane rigidity, the torsional rigidity of the entire floor is sufficient because the shearing rigidity of the core material such as honeycomb or urethane is low. However, particularly in the type of vehicle in which the tunnel portion 2 is formed in the center of the floor 1 as described above, the rigidity of the tunnel portion 2 is low, so that the vehicle body skeleton as shown in FIG. When the floor 1 receives a torsional deformation due to bending vibration, the tunnel portion 2 is deformed, and the rear engine mount bracket 4 and the center bearing bracket 5 also rotate accordingly. Therefore, in the conventional case, as shown in FIG. 13, for example, the fiber direction of the reinforcing fiber layer 7 forming the sandwich structure is set at an appropriate angle θ (for example, 30 to 60 °) with respect to the longitudinal direction of the vehicle body. ) To reinforce the shear rigidity of the core material 8 (see Japanese Utility Model Laid-Open No. 63-30276).

▲

[Problems to be Solved by the Invention] ▲ However, even if the resin floor is reinforced by the fiber-direction arrangement as described above, ▲ in the application to the resin floor in which the tunnel portion is formed, the tunnel ▲ Due to the low rigidity of the part, it was not always sufficiently reinforced. ▲

Therefore, the technical problem to be solved by the present invention is to improve the torsional rigidity of the floor of the automobile in which the tunnel portion is formed and effectively prevent the bending deformation of the floor. is there. ▲

▲

[Means for Solving the Problems] ▲ In order to solve the above technical problems, the present invention provides
A connecting member is provided on the lower surface of the tunnel portion provided substantially in the center of the floor so as to straddle the opening of the tunnel portion, and is located in front of and behind the floor fixing portion of the connecting member. A means for reinforcing the floor of an automobile is a structure in which a high-rigidity portion of the vehicle body frame and the floor fixing portion are connected by a reinforcing member. ▲

▲

[Action] ▲ According to the above-mentioned means, bending vibration of the vehicle body frame is input to the connecting member from the front-back direction through the reinforcing member, so that the moments acting around the floor fixing portions of the connecting member are canceled by each other. The rotation of the connecting member is prevented, the rigidity in the tunnel portion is secured, and as a result, the bending deformation of the floor is effectively prevented. ▲

▲

[First Embodiment] Figs. 1 and 2 show a first embodiment of the present invention. In this embodiment, reference numeral 1 is a floor, and 2 is a tunnel portion provided substantially in the center of the floor. The rear engine mount bracket 4 and the center bearing bracket 5 are arranged on the lower surface of the tunnel portion 2 at two positions in front and behind so as to straddle the opening 6. In the example, the rear engine mount bracket 4 is used as a connecting member. The rear engine mount bracket 4 is made of a rectangular flat plate, and four corners 9a, 9b, 10a, 10b are fastened to the floor 1 at the left and right of the opening 6. In this embodiment, the front corners 9a, 9 of the rear engine mount bracket 4 are arranged along the lower surface of the floor 1.
b and the left and right front pillars 11 located forward of the front corners 9a and 9b.
Rod-shaped reinforcing members 12a and 12b are obliquely arranged between the lower portions of a and 11b, and both ends of the reinforcing members 12a and 12b are front corners 9a and 9b of the rear engine mount bracket 4 and the front pillar. They are connected to the lower portions of 11 ▲ a and 11b, respectively. In addition, rear corners 10a, 10b of the rear engine mount bracket 4
Also, bar-shaped reinforcing members 14a and 14b are respectively arranged in an oblique direction between the lower parts of the left and right center pillars 13a and 13b located behind them.
Both ends of the rear engine mount bracket (4) are rear corners 10a, 10b.
And the lower parts of the center pillars 13a and 13b, respectively. ▲

▲ In this embodiment, the rear engine mount bracket 4 is used.
The reinforcing members 12a, 12b, 14a, 14b are arranged at four angles 9a, 9b, 10 of the rear engine mount bracket 4 as shown in FIG.
When the angle formed by the diagonal line 15 having a and 10b as the apex and the straight line 16 in the vehicle body width direction passing through the intersection on the diagonal line 15 is θ, the front corner 9a of the rear engine mount bracket 4 is If the angle formed by 9 ▲ b and the reinforcing members 12a, 12b is α, and the angle formed by the rear corners 10a, 10b and the reinforcing members 14a, 14b is β,
There is a relationship of α <θ and β> θ. ▲

In the case of having such a relationship, the moments applied to the four corners 9a, 9b, 10a, 10b of the rear engine mount bracket 4 are shown in Table 1 below.
As shown in. Here, the vehicle body twist is the direction of the force applied by the floor twisting deformation as shown in FIG. 2, + M is the counterclockwise moment, and −M is the clockwise moment. ing. ▲

▲

[Table 1] ▲

As is clear from Table 1, the moments acting around the four corners 9a, 9b, 10a, 10b of the rear engine mount bracket 4 are opposite to each other on the front side and the rear side. Each of the vehicle body twists becomes close to zero, and as a result, the rotation of the rear engine mount bracket 4 is suppressed. Viewed from another direction, for example, when the vehicle body is twisted, the corner member 9a receives a compressive load by the reinforcing member 12a, but the rotation of the rear engine mount bracket 4 is suppressed as described above. On the contrary, a load in the direction of the front pillar 11a is generated in the corners 9a, and the corners 9a cancel each other, and as a result, the deformation of the floor is suppressed. ▲

Note that, as shown in FIG. 3, the angle α and the angle β with respect to the angle θ
Contrary to the above embodiment, even if α> θ and β <θ, the relationship between the corners 9a, 9b, 10a and 10b is as shown in Table 2 below. Although the direction of the moment acting on is opposite to that of the above-mentioned embodiment, it eventually becomes close to zero, and the same effect can be obtained. ▲

▲

[Table 2] ▲

FIG. 4 shows a second embodiment of the present invention, in which a center bearing bracket 5 is used as a connecting member arranged on the lower surface of the tunnel portion 2. Also, as the body frame member, the center bearing bracket 5
Lower ends of the center pillars 13a, 13b located in front of the front corners 17a, 17b of the rear seat and both ends of the rear seat cross member 19 located behind the rear corners 18a, 18b of the center bearing bracket 5. Is used. Then, similarly to the above-mentioned embodiment, the reinforcing member 20 obliquely arranged between the front corners 17a, 17b of the center bearing bracket 5 and the lower portions of the center pillars 13a, 13b.
a, 20b are bridged, and the center corner of the rear side bracket 18
Reinforcing members 21a and 21b obliquely arranged are also bridged between a and 18b and both ends of the rear seat cross member 1 (9). Further, the mounting angles of the reinforcing members 20a, 20b, 21a, 21b in this embodiment are the same as in the first embodiment, except that the four corners 17a, 17b, 18a, 18 of the center bearing bracket 5 are mounted.
When the angle formed by the diagonal line 22 having b as its apex and the straight line 23 in the vehicle body width direction passing through the intersection point on the diagonal line 22 is θ, the front corners 17a, 17b of the center bearing bracket 5 and the reinforcing member 20a. , 20b ▲ angle α, rear side corner 18
If the angle formed by a, 18b and the reinforcing members 21a, 21b is β ▲, α <θ, β
>>. Therefore, also in this embodiment, like the first embodiment, the four corners 17a and 17b of the center bearing bracket 5 and 18a and 18b are provided.
The moments acting around the rotations of the front and rear sides are opposite to each other, so that the rotation of the center bearing bracket 5 is suppressed. ▲

FIGS. 5 and 6 show a third embodiment of the present invention, and are particularly applicable to FF vehicles that do not have the rear engine mount bracket 4 and the center bearing bracket 5 as described above. It is what is done. As shown in FIG. 6A, the connecting member 24 in this embodiment is composed of a rear rod 24a extending in the left-right direction and front rods 24b and 24c extending from both ends thereof in the forward direction so as to intersect with each other. . Then, after being arranged in the substantially central portion of the floor 1 (2), both end portions 25a, 25b of the rear rod 24a and the front end portions 26a, 26b of the front rods 24b, 24c are fixed to the floor 1. Also, in this embodiment, the front pillar 1 is attached to the body frame member.
1a, 11b and a rear seat cross member 19 are used, and the lower end portions of the front pillars 11a, 11b and the front end portions 26a, 26b of the front rods 24b, 24c are used.
Are connected by reinforcing members 27a and 27b, and both ends of the rear seat cross member 19 and both ends 25a and 25b of the rear rod 24a are reinforcing members 28.
They are connected by a and 28b. ▲

Therefore, in this embodiment, for example, when the vehicle body is twisted as in the above-mentioned embodiments, the triangle ▲ 5b of the front end rod 24b of the connecting member 24 and the one end portion 2b of the rear rod 24a. Is subjected to a compressive load, and the front end rods 24c and the front rods 24b, 24 are subjected to a tensile load at the front end 26b of the front rod 24c and one end 25a of the rear rod 24a.
Since c are provided so as to intersect with each other, the moments at the respective portions are canceled by each other as in the above-described embodiment, and the rotation of the connecting member 24 is prevented, and as a result, the floor 1 is deformed. Will be suppressed. ▲

7 and 8 show a fourth embodiment of the present invention. This embodiment does not separately provide a reinforcing member along the lower surface of the floor 1 as in each of the above-mentioned embodiments, but is light in weight such as light alloy or unidirectional carbon fiber inside the floor 1 having a sandwich structure. A reinforcing member 29 made of a highly rigid material is inserted. The reinforcing member 2 (9) has a cylindrical closed cross-section structure, and includes a connecting member 30 provided on the lower surface of the tunnel portion 2 and a highly rigid part of the vehicle body (frame member) (front pillar 11 in FIG. 6).
The lower part of (1) and () are provided in between, and have the same effect as the reinforcing member of each of the above-described embodiments. ▲

Further, FIGS. 9 and 10 show a fifth embodiment of the present invention, in which the surface layers 1a and 1b above and below the floor 1 having a sandwich structure are made of carbon fiber or aramid fiber. A reinforcing member 31 made of any reinforcing fiber is arranged.
Here, as in the case of the above-mentioned embodiment, the fiber direction extends from the connecting member (not shown) arranged on the lower surface of the tunnel portion 2 toward the front pillar 11 as the vehicle frame member. ▲

▲ In addition, although the resin floor is explained in each of the above embodiments,
The present invention is not limited to this, and it is needless to say that it can be applied to a floor made of general steel plate. ▲

▲

As described above, according to the floor reinforcing structure for a vehicle according to the present invention, the connecting member is arranged on the lower surface of the tunnel portion provided on the floor so as to straddle the tunnel portion. Since a high-rigidity portion of the vehicle body skeleton ▲ located at a position forward and rearward of the floor fixing portion of the connecting member and the floor fixing portion of the connecting member are connected by a reinforcing member ▲, bending vibration of the vehicle body skeleton, etc. The reinforcing member can surely prevent the rotating action of the connecting member with respect to, and the rigidity of the tunnel portion is increased, so that the twisting deformation of the floor can be suppressed. ▲

[Brief description of drawings]

FIG. 1 is a plan view of a floor showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of part A of FIG.

FIG. 3 is a diagram when the relationship between θ and angles α and β in FIG. 2 is reversed.

FIG. 4 is a plan view of a floor showing a second embodiment of the present invention.

FIG. 5 is a plan view of a floor showing a third embodiment of the present invention.

FIG. 6 is an enlarged view of part B of FIG.

FIG. 7 is a perspective view of an essential part showing a fourth embodiment of the present invention.

8 is a cross-sectional view taken along the line CC in FIG.

FIG. 9 is a perspective view of an essential part showing a fifth embodiment of the present invention.

10 is a cross-sectional view taken along the line DD in FIG.

FIG. 11 is a perspective view showing an example of a resin floor having a tunnel portion.

FIG. 12 is an explanatory diagram showing twist deformation of the floor.

FIG. 13 is a perspective view showing an example of a conventional resin floor.

[Explanation of symbols]

 1 Floor 2 Tunnel Part 4 Rear Engine Mount Bracket (Connecting Member) 5 Center Bearing Bracket (Connecting Member) 6 Opening 9 Front Corner (Floor Fixing Part) 10 Rear Corner (Floor Fixing Part) 11 Front Pillar (Vehicle Skeleton) ) 12 reinforcing member 13 center pillar (vehicle body skeleton) 14 reinforcing member 17 front corner (floor fixing portion) 18 rear corner (floor fixing portion) 19 rear seat cross member (vehicle body skeleton) 20 reinforcing member 21 reinforcing member 24 connecting member 25 Both Ends (Floor Fixing Part) 26 Tip Part (Floor Fixing Part) 27 Reinforcing Member 28 Reinforcing Member 29 Reinforcing Member 30 Connecting Member 31 Reinforcing Member

Claims (1)

[Scope of utility model registration request] 1. A connecting member is provided on the lower surface of a tunnel portion provided substantially at the center of the floor so as to straddle the opening of the tunnel portion, and the connecting member is provided in front of and behind the floor fixing portion of the connecting member. A floor reinforcing structure for an automobile, characterized in that a high-rigidity portion of a vehicle body skeleton located at each position and a floor fixing portion of the connecting member are connected by a reinforcing member.