JPH01309881A - Structure of front body of vehicle - Google Patents

Abstract

PURPOSE:To absorb energy in a collision by forming an inclined surface whose rear is upwards on the upper surface of the rear end of a frame through a process of connecting a reinforcement having a V shape groove on its upper end to a frame in a position below an engine mount bracket installed to a front frame. CONSTITUTION:In a position below the installation unit of an engine mount bracket 6 a reinforcement 11 is connected to a front frame 1. A groove 26 is formed in this reinforcement 11, in order to make stress easily concentrated by an impact load at the time of a collision. An inclined surface 1a whose a rea is upwards is formed on the upper surface of the rear of the front frame 1, in order to be difficult to jump up. Thus, the center of the front frame 1 is transformed to be bent downward according to an impact load so as to absorb impact energy without making the rear end of an engine rise.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a front body structure of a vehicle in which a front frame extending in the longitudinal direction of the vehicle body is disposed on both left and right sides of an engine room. be.

[Prior Art] Conventionally, as shown in, for example, Japanese Utility Model Application Publication No. 59-176275, a plurality of beads are formed at predetermined intervals on a wall surface such as a front frame extending in the front-rear direction of a vehicle body, thereby preventing a collision. The front frame is buckled into a bellows shape to absorb impact energy and improve safety in the event of an automatic 11i crash.

[Problems to be Solved by the Invention] As shown in FIG. 10, a cross member 41 is normally connected to the lower part of the front end of the front frame, so that the front frame may be damaged by the impact load that acts upon a collision during an automatic vehicle. When the front frame 42 undergoes buckling deformation, the front frame 42
The lower part of the front end of the front end is supported by the cross member 41 to prevent it from moving backward.

As a result, as shown in FIG. 11, the curved end portion 43 of the front frame 42 was deformed into a rearwardly upward position in response to the impact load, and the central portion 44 of the front frame 42 protruded upward due to the reaction. transform into a state. An engine mount bracket 46 that supports the side surface of the engine 45 is installed at the center portion 44 of the front frame 41.
According to the deformation of the engine 4, the VIkQ section of the engine 45 rises and retreats, causing problems such as the rear end of the engine 45 coming into contact with the cowl panel. In particular, in a low bonnet type vehicle with a low center height of the engine room, there is a problem in that the distance between the cowl panel and the engine 45 is narrow, so that the engine 45 tends to come into contact with the cowl panel in the event of a collision.

The present invention has been made to solve the above-mentioned problems, and is aimed at preventing the rear end of the engine from rising in the event of a vehicle collision, while effectively absorbing impact energy. The purpose is to provide a partial car body structure.

[Means for Solving the Problem] According to the present invention, a front frame having a closed cross-section shape extending in the longitudinal direction of the vehicle body is disposed on both left and right sides of an engine room located at the front of the vehicle body. An engine mount bracket is attached to the upper surface of the central part in the longitudinal direction, and a reinforcement is connected to the lower part of the engine mount bracket. A groove is formed that causes the upper end of the reinforcement to buckle when the reinforcement is applied, and a rear curved slope is formed on the upper surface of the front frame located behind the installation part of the engine mount bracket. be.

[Function] According to the above configuration, the reinforcement, which is connected to the front frame at the part located below the installation part of the bracket in the engine room, is affected by the impact load acting on this part during a car collision. A groove is formed to facilitate concentration of stress, and the upper surface portion of the front frame located behind the attachment portion of the engine mount bracket is formed to be curved at the rear, so that the rear end portion of the front frame is difficult to jump up. As a result, the central portion of the front frame deforms downward in response to the impact load, thereby absorbing impact energy without causing the rear end of the engine to overturn.

[Embodiment] FIG. 1 shows an embodiment of the front body structure of a vehicle according to the present invention. This front body structure consists of a front frame 1 installed on the left and right sides of the engine room, a front cross member 3 connected to the lower part of the front end of the front frame 1 via a bracket 2, and an engine room and a middle part. The front frame 1 is provided with a dash panel 4 that separates the interior from the interior, and an engine 5 on the upper surface of the longitudinally central portion of the front frame 1.
The engine mount bracket that supports the left and right sides of
-6 is installed.

As shown in FIG. 2, the front frame 1 includes an outer panel 7 having a flat plate shape and an inner panel 8 having a cross-sectional shape. 9. As shown in FIG. 3, in the front part of the front frame 1, a second reinforcement 10 is installed, and behind this reinforcement 10, a second reinforcement 11 and a third reinforcement 12 are installed. and the fourth
Reinforcement 13 is installed. Further, on the upper surface of the front frame 1 located behind the attachment part of the engine mount bracket 6, a rear-curving inclined surface 1a is formed, and at the rear end of this inclined surface 1a, a fifth rainforest is formed. ment 14 is attached.

As shown in FIG. 4, the reinforcement 10 is formed into a box shape with a side wall 15, front and rear walls 16 and upper and lower walls 17 formed on the periphery of the side wall 15, and is provided protruding from the front and rear walls 16. It is joined to the wall surface of the front frame outer panel 7 by means such as spot welding via the flange portion 18, and the side wall 15 and upper and lower walls 17 are joined to the side wall surface and upper and lower wall surfaces of the front frame inner panel 8, respectively. It is composed of In addition, the second
A groove-shaped bead 20 is formed in the vertical direction on the side wall 15 of the reinforcement 10, and corresponds to a pair of upper and lower beads 19 formed on the side wall of the front frame inner panel 8. 'Also, the second reinforcement 11
As shown in FIG. 5, it is formed into a box shape with a trapezoidal side wall 21, front and rear walls 22 and upper and lower walls 23 formed on the periphery of the trapezoidal side wall 21. The flange portion 25 is connected to the wall surface of the front frame outer panel 7 via the flange portion 24 , and is protruded from the side wall 21 , the upper and lower walls 23 , and the front and rear walls 22 . It is configured to be joined to the side wall surface and the upper and lower wall surfaces of the front frame inner panel 8 at the lower part. Further, on the side wall 21 of the second reinforcement 11,
By forming a downwardly tapered groove 26 in the center of the upper end, the upper end of the second reinforcement 11 is configured to buckle when a compressive load is applied to the front frame 1.

Furthermore, groove-shaped beads 27 and 28 are formed on the sides and below the groove portion 26, respectively, and extend in the longitudinal direction of the vehicle body.

As shown in FIG.
It is formed in a shape corresponding to the central wall surface of the front frame outer panel 7, and is joined to the wall surface of the front frame outer panel 7 by means such as spot welding. Further, as shown in FIG. 7, the fourth reinforcement 13 includes a side wall 29 extending in the longitudinal direction of the vehicle body along the side wall of the front frame inner panel 8, a front and rear wall 30 formed on the peripheral edge thereof, and It is formed in a box shape with upper and lower walls 31, and is arranged between the front frame inner panel 8 and the second reinforcement 11 and is configured to be integrally joined thereto.

This fourth reinforcement has a rearwardly rising inclined surface 32 formed on the lower surface of the front end, and a recessed groove-shaped bead 33 extending in the vertical direction is formed on the upper front part of the side wall 29, and at the rear thereof. A groove-like bead 34 extending in the width direction of the vehicle is formed on the upper and lower walls 31 located at the upper and lower walls 31, respectively.

Further, as shown in FIG. 8, the fifth reinforcement 14 includes a triangular side wall 35, an upper wall 36 formed at the upper end of the triangular side wall 35, and this side! 135 and a flange portion 37 formed on the peripheral edge of the upper wall 36, and is configured to be joined to the rear end upper surface of the front frame inch panel 8 and the front surface of the dash panel 4. A bead 38 is formed on the side wall 35 of the fifth reinforcement 14. The bead 38 is a protrusion extending in the front-rear direction.

As mentioned above, since the second reinforcement 11 is joined to the front frame 1 at the part located below the installation part of the engine mount bracket 6, this part is effectively reinforced and the engine 5 is stably supported. can do. And the second reinforcement 11
Since a groove 26 is formed at the upper end, when an impact load 1 acts on the front frame 1 during a collision of a car, the response concentrates on the groove 26 as shown in FIG. The upper end of the reinforcement 11 is crushed,
In response to this, the installation portion of the engine mount bracket 6 of the front frame 1 is deformed so as to be bent downward. Therefore, it is possible to reliably prevent the rear end portion of the engine 5 supported by the front frame 1 from rising, and to effectively prevent impact energy at the time of a collision according to the deformation of the front frame 1.

However, since the upper surface of the front frame 1 located behind the installation part of the engine mount bracket 6 is formed with the sloped surface 1a, the rear end of the front frame 1 will bounce up in the event of a collision. In addition to being able to reliably prevent this, stress can be more effectively concentrated in the groove portion 26 of the second reinforcement 11. In particular, in the above embodiment, the front frame 1
Since the fifth reinforcement 14 is installed on the upper surface of the rear end portion to reinforce this portion, it is possible to more reliably prevent the ``a'' portion of the front frame 1 from jumping up.

Further, in the above embodiment, the second reinforcement 11
The side wall 21 and the front and rear walls 11 and upper and lower walls 23 of the peripheral edge thereof
Since the front frame 1 is formed into a box shape, it has the advantage that the second reinforcement 11 can prevent the central portion of the front frame 1 from twisting and deforming in response to an impact load at the time of a collision.

Further, in the above embodiment, a rearwardly downward inclined surface 32 is formed on the lower surface of the front end of the fourth rain reinforcement 13 installed in the front frame 1.
Since the # end of #3 is configured to have low rigidity, the inclined surface 3
The front frame 1 is intensively compressed and deformed at the portion located below the front frame 2. Therefore, even if the lower part of the front end of the front frame 1 is supported by the front cross member 3 and its backward movement is prevented, there is an advantage that the front part of the front frame 1 can be prevented from being deformed into a backward-lowering state. .

[Effects of the Invention] As explained above, the present invention has a groove portion that buckles and deforms the upper end portion in response to a compressive load acting on the front frame in a portion located below the installation portion of the engine mount bracket. In addition to joining the reinforcement, we formed a rearward-sloping slope on the upper surface of the front frame located behind the installation part of the engine mount bracket, so that the reinforcement By concentrating stress on the groove of the front frame and buckling the upper end of the reinforcement, it is possible to bend the engine mount bracket installation part of the front frame downward. Therefore, the front frame can be deformed to effectively absorb impact energy during a collision without raising the rear end of the engine supported by the front frame.

[Brief explanation of the drawing]

FIG. 1 is a side view showing essential parts of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a side view showing a state in which the inner panel of the front frame is removed. 4 is a perspective view showing the structure of the second reinforcement, FIG. 5 is a perspective view showing the structure of the second reinforcement, FIG. 6 is a perspective view showing the structure of the third reinforcement, and FIG.
The figure is a perspective view showing the configuration of the fourth reinforcement, FIG. 8 is a perspective view showing the configuration of the fifth reinforcement,
FIG. 9 is a side view showing a deformed state of the front frame at the time of a collision, FIG. 10 is a side view showing a conventional example, and FIG. 11 is a side view showing a deformed state of the front frame at the time of a collision in the conventional example. 1... Front frame, 1a... Inclined surface, 6...
・Engine mount bracket, 11...Reinforcement, 26...Groove. Patent applicant Mazda Co., Ltd. No. 4
Figure 7 7 Figure 10 Figure 1, ζ Figure 11

Claims (1)

[Claims] 1. A front frame with a closed cross section that extends in the longitudinal direction of the vehicle body is provided on both left and right sides of the engine room located at the front of the vehicle body, and an engine mount bracket is installed on the upper surface of the longitudinal center of this front frame. At the same time, a reinforcement is joined to the part located below the installation part of this engine mount bracket, and when a compressive load is applied to the front frame, the upper end of the reinforcement is attached to the reinforcement. 1. A front body structure for a vehicle, characterized in that a groove portion for bending is formed, and a rearwardly rising inclined surface is formed on an upper surface portion of a front frame located behind the installation portion of the engine mount bracket.