JP2007069640A - Vehicle front structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle front structure of an automobile which reduces the number of points of accuracy control and labor and cost for controlling position accuracy by reducing the number of components, and has the sufficient rigidity of a vehicle body and shock absorbing performance. <P>SOLUTION: A dash cross member provided between a cabin of a front lower part of the automobile and an engine room, and a front deck cross member provided between under parts of right and left front pillars are integrated to be an integral member 1, and the shape of the integral member 1 is made to be open in one direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of a vehicle body front portion of an automobile.

  In recent years, as a skeletal structure of the front part of a car body, a deck-forward structure is often used to increase the cabin space. For this reason, the length of the front side member of the vehicle is shortened, and the collision energy is absorbed in a vehicle employing a crushable body that absorbs the collision energy while the vehicle body skeleton is crushed as a collision energy absorption method in the event of a vehicle collision. It has become difficult to ensure absorption performance.

  For example, in the skeleton structure of the front part of the vehicle body as shown in FIG. 3, the front side members 20 that are provided on the left and right of the front part of the vehicle body and extend in the front-rear direction of the vehicle body The front deck cross member 22 extending between the left and right front pillars 21 is bent obliquely downward toward the rear near the front lower portion of the front deck cross member 22, and then bent again immediately below the front deck cross member 22 so that the height from the ground is increased. The height is approximately the same as the surface. A bent portion of the front side member 20 is referred to as a Z portion 24.

  By configuring the front side member 20 in this way, the dash panel can be installed on the front side of the vehicle body, and the cabin space can be expanded. Further, the front side member 20 receives an input at the time of a vehicle collision, and the front side of the vehicle body is crushed into an accordion shape to absorb collision energy. Such a front body structure of an automobile is disclosed in Patent Document 1 below.

JP 2004-74868 A

  In the vehicle body front structure disclosed in Patent Document 1, the front side member 20 provided in the entire vehicle body, the front deck cross member 22 installed between the front pillars 21, and the connecting portion between the front pillars 21 are provided. A dash cross member 23 that rigidly connects the vicinity is provided, and the collision energy at the time of a vehicle collision is distributed to the front pillar 21 side via the front side member 20.

  However, the vehicle body front structure disclosed in Patent Document 1 is composed of a large number of parts such as a front side member 20, a dash cross member 23, a front deck cross member 22, and a front pillar 21, so At the time of production, there is a possibility that a lot of accuracy control such as the mounting position and welding position of each part and the size of each part may be required.

  Accordingly, the present invention provides a vehicle body front structure having a sufficient vehicle body rigidity and collision energy absorption performance while reducing the number of components and improving accuracy control points and position accuracy. Objective.

  According to the vehicle body front structure according to the first invention (corresponding to claim 1) for solving the above-described problem, a dash cross member provided between a passenger compartment of the automobile and a front space of the passenger compartment; The front deck cross member provided between the lower portions of the left and right front pillars is integrated into an integrated member, and the cross-sectional shape of the integrated member is a shape that opens in one direction.

  According to a vehicle body front structure according to a second invention (corresponding to claim 2) for solving the above-mentioned problems, in the vehicle body front structure according to the first invention, the cross-section of the integral member The shape is characterized in that the shape is open upward or downward.

  According to the vehicle body front part structure according to the third invention (corresponding to claim 3) for solving the above-mentioned problems, the vehicle body front part of the vehicle according to either the first invention or the second invention The structure is characterized in that the integrated member is integrated with a mounting bracket of a component supported by the integrated member.

  According to a vehicle body front structure according to a fourth invention (corresponding to claim 4) for solving the above-mentioned problem, a vehicle body front part according to either the first invention or the second invention The structure is characterized in that the integral member is integrated with a steering column support bracket that supports the steering column.

  According to the vehicle body front structure according to the fifth invention (corresponding to claim 5) for solving the above-mentioned problems, the vehicle body front of the vehicle according to either the first invention or the second invention The structure is characterized in that the integrated member is integrated with an airbag support bracket that supports the airbag.

  According to the vehicle body front structure according to the sixth invention (corresponding to claim 6) for solving the above-mentioned problems, the vehicle body front of the vehicle according to either the first invention or the second invention In the structure, the integral member is integrated with a pedal support bracket that supports an accelerator or a brake pedal.

  According to the vehicle body front part structure according to the seventh invention (corresponding to claim 7) for solving the above-mentioned problem, the vehicle body front part of the vehicle according to either the first invention or the second invention In the structure, the integrated member is integrated with an audio support bracket that supports an electronic device provided in an instrument panel of the automobile.

  According to an eighth aspect of the present invention for solving the above-mentioned problems (claim 8), the vehicle body front structure according to any one of the first to seventh inventions. In the structure, the integral member is manufactured by casting, die casting, or thixomolding.

  According to the first aspect of the present invention, the dash cross member provided between the passenger compartment at the lower front of the automobile and the front space of the passenger cabin and the deck cross member provided between the left and right front pillar lower portions are integrated and integrated. As a member, the integrated member has a cross-sectional shape that opens in one direction, reducing the number of components and improving the accuracy control score and position accuracy, as well as sufficient vehicle body rigidity and collision energy absorption. Performance can be ensured. Furthermore, the weight of the vehicle body can be reduced by reducing the number of components.

  According to the second aspect of the present invention, the integral member can be easily manufactured by making the cross-sectional shape of the integral member upward or downward substantially U-shaped. In addition, by changing the thickness of the bottom of the U-shape of the integral member, the deformation amount, the vehicle body rigidity, and the collision energy absorption performance of each part of the vehicle body skeleton at the time of a collision can be easily set to desired values. In addition, when the cross-sectional shape of the integral member is a substantially U-shape opened upward, it is easy to take the center of gravity at a desired position, and it is also possible to easily pass electrical wiring or the like inside the U-shape of the integral member. .

  According to the third invention, by integrating the integral member and the mounting bracket of the component supported by the integral member, it is possible to reduce the number of components and thereby reduce the labor and cost for managing the accuracy and the position accuracy. Can be reduced.

  According to the fourth aspect of the invention, the integral member and the steering column support bracket that supports the steering column are integrated, thereby reducing the number of components and the labor and cost involved in managing the accuracy and the position accuracy. Can be reduced.

  According to the fifth aspect of the invention, since the integrated member and the airbag support bracket for supporting the airbag are integrated, it is possible to reduce the number of components, and the labor and cost involved in managing the accuracy and the position accuracy. Can be reduced.

  According to the sixth aspect of the invention, the integral member and the pedal support bracket that supports the accelerator or brake pedal are integrated, so that the number of components is reduced, and the labor required for the accuracy management score and the position accuracy management is reduced. Cost can be reduced.

  According to the seventh aspect of the invention, since the integrated member and the audio support bracket that supports the electronic device provided on the instrument panel of the automobile are integrated, the number of components is reduced, and the accuracy management score and position accuracy are reduced. It is possible to reduce the labor and cost required for management.

  According to the eighth aspect of the invention, the integral member can be easily manufactured by casting or die casting, so that the integrated member having a complicated shape can be easily manufactured.

  A vehicle body front structure according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of an integral member according to an embodiment of the present invention, and FIG. 2 is a perspective view of a vehicle body front structure according to a first embodiment. In each figure, Fr indicates the front of the vehicle body, In indicates the cabin interior, and Up indicates the vehicle body upper side.

  Hereinafter, the front body structure of the automobile according to the present embodiment will be described. As shown in FIG. 2, the front side member 10 is installed in the lower part of the front part of a motor vehicle so that it may extend in the vehicle front-back direction. The front side member 10 is bent obliquely downward toward the rear near the front lower portion of the boundary between the front space of the passenger compartment (the engine compartment when the engine is mounted in front of the passenger compartment) and the passenger compartment, and then the front space. It is bent again just below the boundary between the cabin and the cabin so that the height from the ground is almost the same as the vehicle floor. A bent portion of the front side member 10 is referred to as a Z portion 11.

  Further, front pillars 12 are installed on both sides of the front portion of the automobile so as to extend obliquely upward of the vehicle. A side sill 13 is installed at the lower part of the front pillar 12 so as to extend rearward of the vehicle. The integrated member 1 is installed on a line connecting the Z portion 11 of the front side member 10 and the inner side of the lower side of the front pillar 12. The integral member 1 is a substantially trapezoidal frame.

  As shown in FIG. 1, the integral member 1 has a bowl-like frame, and its cross section has a substantially U-shape that opens upward as indicated by AA. In the present embodiment, the cross section of the frame has a substantially U-shape that opens upward, but it can also have a substantially U-shape that opens downward.

  As shown in FIGS. 1 and 2, the dash cross member portion 2 on the lower front side of the integrated member 1 has substantially the same length as the distance between the left and right front side members 10. The left and right front side members 10 and the integral member 1 are in contact with both end portions 21 on the lower surface of the dash cross member portion 2 and the upper portion 20 of the Z portion 11 of the front side member 10 and are joined by welding or bolting.

  The front deck cross member portion 3 on the upper side of the integral member 1 has substantially the same length as the interval between the lower portions of the left and right front pillars 12. The lower portions of the left and right front pillars 12 and the integral member 1 are in contact with both side surfaces 22 of the front deck cross member portion 3 and the inner surface 23 of the front pillar 12 lower portion, and are joined by welding or bolting.

  The dash cross member portion 2 and the front deck cross member portion 3 include a connecting portion 4a that connects the left end of the dash cross member portion 2 and the left end of the front deck cross member portion 3, and the right end of the dash cross member portion 2 and the front deck cross. It is united by the communication part 4b which connects the right end of the member part 3. FIG. In this embodiment, the integral member 1 is manufactured by casting or die casting.

  On the right side of the front deck cross member portion 3 is a steering column support bracket 5 for supporting the steering column shaft. The steering column support bracket 5 is provided with a semi-cylindrical convex portion 5a extending in the front-rear direction. A steering column shaft is fitted below the convex portion 5a and fixed by bolting or the like.

  At the center of the front deck cross member portion 3 is an audio support bracket 6 for supporting audio, a display, and the like. The audio support bracket 6 sandwiches audio between the left and right support portions 6a and 6b, and is fixed by bolting or the like.

  On the left side of the front deck cross member 3 is a passenger airbag support bracket 7 for supporting the passenger airbag. The passenger-seat airbag support bracket 7 is a convex portion provided so as to extend in the vehicle width direction, and the passenger-seat airbag is installed on the wall surface of the passenger-side airbag support bracket 7 on the passenger cabin side. Fix by tightening.

  There is an accelerator pedal support bracket 8 for supporting the accelerator pedal inside the passenger compartment at the right end of the dash cross member portion 2. The accelerator pedal support bracket 8 is a convex portion projecting in the cabin direction. The accelerator pedal is installed on the wall surface of the accelerator pedal support bracket 8 on the cabin side and fixed by bolting or the like. Although the accelerator pedal support bracket that supports the accelerator pedal has been described here, the dash cross member portion 2 may be formed with a pedal support bracket that supports the brake pedal and the clutch pedal.

  In this embodiment, the steering column support bracket 5, the audio support bracket 6, the passenger seat airbag support bracket 7 and the accelerator pedal support bracket 8 are mounting brackets described as means for solving the problems.

  According to the vehicle body front structure according to the present embodiment, the dash cross member 2 and the front deck cross member 3 are integrated, thereby reducing the number of components and improving the position accuracy. It is possible to reduce the labor and cost for managing the position accuracy, and to ensure sufficient vehicle body rigidity and collision energy absorption performance.

  Furthermore, the weight of the vehicle body can be reduced by reducing the number of components. In addition, by making the cross-sectional shape of the integral member 1 into an approximately U shape that opens upward or downward, it is easy to remove the integral member 1 from the mold when it is manufactured by casting or die casting. Can be easily.

  Further, by changing the thickness of the base 24 opposite to the opening of the integral member 1, the deformation amount, the vehicle body rigidity, and the collision energy absorption performance of each part of the vehicle body skeleton at the time of the collision can be easily set to desired values. be able to. Further, by making the cross-sectional shape of the integrated member 1 into a substantially U shape opening upward, it becomes easy to take the center of gravity at a desired position, and further, it is easy to pass electric wiring or the like inside the U shape of the integrated member 1. be able to.

  Further, by integrating the integral member 1 and the mounting bracket of the component supported by the integral member 1, it is possible to reduce the number of components and reduce labor and cost for managing accuracy and position accuracy. it can. Further, by providing a plurality of mounting brackets on the integrated member 1 and manufacturing the integrated member 1 by casting or die casting, the integrated member 1 having a complicated shape can be easily manufactured.

3 is a perspective view of an integral member according to Embodiment 1. FIG. 1 is a perspective view of a vehicle body front part structure according to Embodiment 1. FIG. It is a perspective view of the conventional vehicle body front part structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Integrated member 2 Dash cross member part 3 Front deck cross member part 4a, 4b Connection part 5 Steering column support bracket 6 Audio support bracket 7 Passenger's seat air bag support bracket 8 Accelerator pedal support bracket 10 Front side member 11 Z part 12 Front pillar

Claims (8)

A dash cross member provided between the passenger compartment of the automobile and the front space of the guest room and a front deck cross member provided between the lower portions of the left and right front pillars are integrated into an integrated member, and the cross-sectional shape of the integrated member is An automobile body front structure characterized by having a shape opening in one direction. The vehicle body front part structure according to claim 1,
The vehicle body front structure of an automobile, characterized in that the cross-sectional shape of the integral member is open at one of the upper side and the lower side. In the vehicle body front part structure according to claim 1 or 2,
The vehicle body front structure of an automobile, wherein the integrated member is integrated with a mounting bracket of a component supported by the integrated member. In the vehicle body front part structure according to claim 1 or 2,
The vehicle body front structure according to claim 1, wherein the integrated member is integrated with a steering column support bracket that supports the steering column. In the vehicle body front part structure according to claim 1 or 2,
The vehicle body front structure of an automobile, wherein the integrated member is integrated with an airbag support bracket for supporting an airbag. In the vehicle body front part structure according to claim 1 or 2,
The vehicle body front structure of an automobile, wherein the integrated member is integrated with a pedal support bracket that supports an accelerator or a brake pedal. In the vehicle body front part structure according to claim 1 or 2,
The vehicle body front structure of an automobile, wherein the integrated member is integrated with an audio support bracket that supports an electronic device provided on an instrument panel of the automobile. The vehicle body front part structure according to any one of claims 1 to 7,
The vehicle body front structure, wherein the integral member is manufactured by casting, die casting, or thixomolding.

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