JP4193507B2 - Body structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body structure, and more particularly to a vehicle body structure that suppresses twisting of a vehicle body due to engine rotation in a vehicle such as an automobile.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a vehicle body structure of a vehicle such as an automobile, a radiator mount bracket that is disposed on the front surface of a front cross member so that the weight of the radiator to be mounted acts on the front of the centroid of the front cross member, and the front cross member By providing an engine mount bracket that is disposed on the rear surface and causes a load due to engine rotation to be applied to act behind the centroid of the front cross member, by the weight of the radiator viewed from the centroid of the front cross member A structure is known in which the moment and the moment due to the engine rotation load viewed from the centroid of the front cross member are canceled to suppress the torsion of the vehicle body due to the engine rotation load (see Non-Patent Document 1, for example). .)
[0003]
[Non-Patent Document 1]
Koji Yamamoto, Takeshi Sakai, “Toyota Technical Disclosure Collection 9301”, April 28, 1999, p. 169-171
[0004]
[Problems to be solved by the invention]
However, in such a conventional technology, the radiator mount bracket and the engine are positioned so as to offset the moment due to the weight of the radiator viewed from the centroid of the front cross member and the moment due to the engine rotation load viewed from the centroid of the front cross member. Since it is necessary to dispose the mounting bracket, the configuration becomes complicated.
[0005]
An object of the present invention is to obtain a vehicle body structure that can suppress the torsion of the vehicle body due to the engine rotation load with a simple configuration in consideration of the above facts.
[0006]
[Means for Solving the Problems]
In the first aspect of the present invention, both end portions in the vehicle width direction are curved obliquely rearward of the vehicle body with respect to the center portion in the vehicle width direction, and the front ends in the left and right vehicle width directions are connected to the left and right front side members, respectively. A front cross member,
An engine mount attached to a vehicle body rear side portion in the vehicle width direction center portion of the front cross member;
The connecting position of the front cross member with the left and right front side members is matched with the axial center of the insulator of the engine mount .
[0007]
Accordingly, both ends of the front cross member in the vehicle width direction are curved obliquely rearward of the vehicle body with respect to the center portion in the vehicle width direction , and the front ends in the left and right vehicle width directions are connected to the left and right front side members. The connecting position of the front cross member with the left and right front side members coincides with the axial center of the insulator of the engine mount attached to the vehicle body rear side portion at the center in the vehicle width direction of the member . For this reason, the moment by the load of engine rotation does not act on the connection position of the front cross member with the left and right front side members. As a result, the torsion of the vehicle body due to the engine rotation load can be suppressed. Further, since only the connection position of the front cross member with the left and right front side members is changed, the twist of the vehicle body due to the engine rotation load can be suppressed with a simple configuration.
[0008]
According to a second aspect of the present invention, in the vehicle body structure according to the first aspect, the left and right front ends of the front cross member are fixed to brackets constituting a part of the left and right front side members, respectively. and said that you are.
[0009]
Accordingly, both ends of the front cross member in the vehicle width direction are curved obliquely rearward of the vehicle body with respect to the center portion in the vehicle width direction, and the left and right vehicle width direction ends respectively constitute a part of the left and right front side members. It is connected to, the insulator of the axis of the engine mount attached to the vehicle body rear side of the vehicle width direction central portion of the front cross member, and a bracket which constitutes a part of the left and right front side members of the front cross member The connection positions of are the same . For this reason, the moment by the load of engine rotation does not act on the connection position of the front cross member with the left and right front side members. As a result, the torsion of the vehicle body due to the engine rotation load can be suppressed. Further, since only the connection position of the front cross member with the left and right front side members is changed, the twist of the vehicle body due to the engine rotation load can be suppressed with a simple configuration.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a vehicle body structure according to the present invention will be described with reference to FIGS.
[0011]
In the figure, the arrow FR indicates the vehicle body front direction, the arrow UP indicates the vehicle body upward direction, and the arrow IN indicates the vehicle width inside direction.
[0012]
As shown in FIG. 1, a pair of left and right front side members 12 are disposed in the front portion of the vehicle body 10 according to the present embodiment in the vicinity of the lower portions at both ends in the vehicle width direction along the longitudinal direction of the vehicle body. Forms a closed section extending in the longitudinal direction of the vehicle body. Further, a front cross member 14 is disposed in the vicinity of the front end portion 12A of the front side member 12 along the vehicle width direction, and a rear portion (on the rear side of the vehicle body) of the center portion 14A in the vehicle width direction of the front cross member 14 is disposed. The front portion 18A of the engine 18 is attached to the part) via the engine mount 16.
[0013]
The rear portion 18B of the engine 18 is connected to the suspension member 22 via the engine mount 20. Further, at both ends in the vehicle width direction of the suspension member 22, mounting leg portions 22A bifurcated in the longitudinal direction of the vehicle body are formed. The suspension member 22 is connected to the front side via these mounting leg portions 22A. The member 12 is attached via a mount 24.
[0014]
Further, rear portions 18 </ b> C of both side portions of the engine 18 are connected to the front side member 12 via an engine mount 26.
[0015]
As shown in FIG. 3, the front cross member 14 is made of a pipe material, and the engine mount 16 is disposed on the vehicle body rear side portion 14 </ b> A at the center in the vehicle width direction of the front cross member 14 via a pair of left and right brackets 30. Installed.
[0016]
As shown in FIG. 4, the engine mount 16 has a known structure including an insulator 32, a cross member fixing portion 34, and an engine fixing portion 36, and both end portions 34A of the cross member fixing portion 34 in the vehicle width direction are brackets. 30. The engine fixing portion 36 has a rear wall portion 36A fixed to the engine 18 by a fixing member such as a bolt (not shown), and is connected to a connecting portion between the cross member fixing portion 34 and the engine fixing portion 36. The axial center 32 </ b> A of the disposed insulator 32 is the center P of the moment due to the engine rotation load in the engine mount 16.
[0017]
As shown in FIG. 1, both end portions 14B in the vehicle width direction of the front cross member 14 are curved diagonally rearward of the vehicle body. Further, the front end 14C of the front cross member 14 in the vehicle width direction is disposed on the front side member 12 on the extension line of the center P of the moment M (see FIG. 2) due to the rotational load of the engine 18 in the engine mount 16. It is welded to a bracket 40 constituting a part of the member 12.
[0018]
As shown in FIG. 3, the front width member 14 </ b> C in the vehicle width direction of the front cross member 14 is welded to the lower portion 40 </ b> A of the bracket 40, and the upper edge 40 </ b> B of the bracket 40 is the inner wall portion in the vehicle width direction of the front side member 12. It is fixed to the lower part of 12B by fixing means 44 such as bolts.
[0019]
Therefore, in the present embodiment, as shown in FIG. 1, the front end 14C in the vehicle width direction, which is the connecting position of the front cross member 14 to the front side member 12, is connected to the vehicle body rear side portion 14A of the front cross member 14. This coincides with the center P of the moment M due to the rotational load of the engine 18 in the engine mount 16.
[0020]
Next, the operation of this embodiment will be described.
[0021]
In the present embodiment, as shown in FIG. 1, both end portions 14B in the vehicle width direction of the front cross member 14 are curved obliquely toward the rear of the vehicle body, and the front end 14C in the vehicle width direction of the front cross member 14 is engine mount. 16 is welded to the lower part 40A of the bracket 40 constituting a part of the front side member 12 on the extension line of the center P of the moment M due to the rotational load of the engine 18 in FIG.
[0022]
That is, the connecting position of the front cross member 14 with the front side member 12 is the center of the moment M (the insulator 32 of the insulator 32) due to the rotational load of the engine 18 in the engine mount 16 connected to the vehicle body rear side portion 14A of the front cross member 14. Axis 32A) coincides with P.
[0023]
Accordingly, the moment M due to the engine rotation load does not act on the front end 14C in the vehicle width direction, which is the connecting position of the front cross member 14 with the front side member 12. As a result, the torsion of the vehicle body 10 due to the engine rotation load can be suppressed, and it is also necessary to reinforce the connecting portion between the front cross member 14 and the bracket 40 and the connecting portion between the bracket 40 and the front side member 12 in preparation for torsion. Absent.
[0024]
Further, in the present embodiment, since the vehicle width direction both end portions 14B, which are the connecting positions of the front cross member 14 and the front side member 12, are only changed to bend toward the vehicle body diagonally rearward, the engine can be configured with a simple configuration. The torsion of the vehicle body due to the rotation load can be suppressed.
[0025]
Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above embodiment, the front cross member 14 is made of a pipe material, but the front cross member 14 is not limited to a pipe material, and may be made of other materials such as a rectangular closed cross-section structure.
[0026]
Further, in the above embodiment, the bracket 40 constituting a part of the front side member 12 is fixed to the front side member 12 by the fixing means 44 such as a bolt, but instead, a part of the front side member 12 is fixed. The constituting bracket 40 may be welded to the front side member 12. Further, the front side member 12 and the bracket 40 may be integrated.
[0027]
【The invention's effect】
In the first aspect of the present invention, both end portions in the vehicle width direction are curved obliquely rearward of the vehicle body with respect to the center portion in the vehicle width direction, and the front ends in the left and right vehicle width directions are connected to the left and right front side members, respectively. A front cross member, and an engine mount attached to a vehicle body rear side portion in the vehicle width direction center of the front cross member. An insulator of the engine mount is connected to a front cross member at a connecting position of the left and right front side members. because it is aligned with the axial center, with a simple configuration, an excellent effect of suppressing the twisting of the vehicle body due to the load of the engine.
[0028]
According to a second aspect of the present invention, in the vehicle body structure according to the first aspect, the left and right front ends in the vehicle width direction of the front cross member are respectively fixed to brackets constituting a part of the left and right front side members. It has an excellent effect that the twist of the vehicle body due to the engine rotation load can be suppressed with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing a vehicle body structure according to an embodiment of the present invention.
FIG. 2 is a side sectional view showing a vehicle body structure according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a vehicle body structure according to an embodiment of the present invention as viewed from the rear side of the vehicle body diagonally inside.
FIG. 4 is an exploded perspective view of the vehicle body structure according to the embodiment of the present invention as viewed from the rear side of the vehicle body diagonally inside.
[Explanation of symbols]
12 Front side member 14 Front cross member 14A Front cross member vehicle width direction center portion 14B Front cross member vehicle width direction both ends 14C Front cross member vehicle width direction front end 16 Engine mount 18 Engine 32 Engine mount insulator 32A Insulator Axle 34 Engine mount cross member fixing part 36 Engine mount engine fixing part 40 Bracket (front side member)

Claims (2)

Front cross members in which both end portions in the vehicle width direction are curved toward the vehicle body diagonally rearward with respect to the center portion in the vehicle width direction, and front ends in the vehicle width direction are respectively connected to the left and right front side members;
An engine mount attached to a vehicle body rear side portion in the vehicle width direction center portion of the front cross member;
A vehicle body structure characterized in that a connecting position of the front cross member with the left and right front side members coincides with an axis of an insulator of the engine mount . 2. The vehicle body structure according to claim 1, wherein left and right front ends in the vehicle width direction of the front cross member are fixed to brackets that constitute part of the left and right front side members, respectively.

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