JP2010247599A - Vehicle body front structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body front structure in which a vehicle rigidity at a suspension support part is effectively reinforced. <P>SOLUTION: This vehicle body front structure includes main frames 20 which are installed on the sides of an engine room, which extend generally in the longitudinal direction, and the rear ends of which are connected to the front end of a cabin 10, side frames 80 which are disposed on the vehicle lateral outer sides and at higher positions than the main frames and which extend generally in the longitudinal direction, and suspension support part 100 which are installed between the main frames and the side frames and to which the upper ends of the shock absorbers of the suspensions are affixed. The vehicle body front structure comprises closed section parts S2, S3 which are disposed along the front ends or the rear ends of the suspension support parts, one ends of which are connected to the side frames, the other ends of which are connected to the upper surface parts of the main frames over the generally entire width, and which are connected to the side surface parts of the main frames on the vehicle lateral outer sides over the generally overall height. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vehicle body front structure of a vehicle such as an automobile, and more particularly to a structure that improves a steering stability by lightly and effectively reinforcing a suspension support portion.

  For example, in a front body structure of an automobile such as a passenger car, a main frame extending along the side of the engine room from a toe board, which is a partition wall in front of the cabin, and a side frame extending along both ends of the hood from the cowl top The structure it has is well known. In such a vehicle body front part structure, it is known to provide a tower-like suspension support part that supports the upper end part of the shock absorber of the suspension between the main frame and the side frame.

  The suspension support described above receives a damping force generated by the shock absorber, and also receives a spring reaction force when the shock absorber and the spring are arranged substantially coaxially. In addition, in the case of a strut suspension using a shock absorber as a support for positioning a wheel, an input caused by tire force at the time of cornering or the like is also received. When such a suspension support part is displaced relative to other parts of the vehicle body, the suspension geometry changes and the suspension performance is impaired. Is required.

As a conventional vehicle body front structure, for example, Patent Document 1 discloses a suspension tower for a vehicle in which the position of a reinforcing member coupled to the lower end of the suspension tower (joint portion with the main frame) is aligned with the suspension cross member mounting portion. The attachment structure is described.
Patent Document 2 describes a suspension tower structure having a closed cross section that connects a side surface of an upper member (side frame) and a side member (main frame) along the front and rear of the suspension tower.

Japanese Utility Model Publication No. 6-65167 Japanese Patent Laid-Open No. 8-26138

However, in the technique described in Patent Document 1, the connection method between the main frame and the side frame is not continuous and the coupling loss is large. Further, since the joint portion with the main frame where the moment is maximum has an open cross section, it is difficult to increase the coupling rigidity.
On the other hand, since the technique described in Patent Document 2 connects the side surface of the main frame and the side frame by a closed cross section, the coupling loss can be reduced as compared with the technique described in Patent Document 1, Since it is connected only to the side surface portion of the frame, the cross-sectional deformation of the main frame is increased, resulting in poor load transmission.
The subject of this invention is providing the vehicle body front part structure which strengthened the vehicle body rigidity in a suspension support part effectively.

The present invention solves the above-described problems by the following means.
According to the first aspect of the present invention, there is provided a main frame provided at a side portion of the engine room and extending substantially along the front-rear direction and having a rear end portion connected to a front end portion of the passenger compartment. A vehicle body front portion including a side frame disposed at a high position and extending substantially along the front-rear direction, and a suspension support portion provided between the main frame and the side frame and to which a shock absorber upper end portion of the suspension is fixed The suspension support portion is disposed along the front end portion or the rear end portion of the suspension support portion, and one end portion is connected to the side frame and the other end portion extends over the entire width of the upper surface portion of the main frame. A closed cross-section portion connected to the side surface portion on the outer side in the vehicle width direction of the main frame and connected over substantially the entire height. A vehicle body front structure according to.
Here, the closed cross-section portion may have a configuration in which a plurality of closed cross-section portions are connected to each other without interposing the open cross-section portion.

The invention of claim 2 includes a lower structural member coupled to a lower portion of the main frame, and a reinforcing member provided at a coupling portion between the main frame and the lower structural member for suppressing cross-sectional deformation of the main frame. 2. The vehicle body front structure according to claim 1, wherein an end portion of the closed cross-section portion on the main frame side is connected to a portion of the main frame where the reinforcing member is provided.
The invention according to claim 3 is characterized in that an end portion of the closed cross section on the side frame side wraps around a side portion of the suspension support portion and is arranged along the side frame. The vehicle body front part structure according to claim 2.

According to the present invention, the following effects can be obtained.
(1) It is disposed along the front end portion or the rear end portion of the suspension support portion, one end portion is connected to the side frame, and the other end portion is connected to the upper surface portion of the main frame over almost the entire width. By providing a closed cross-section connected to almost the entire height on the lateral side of the vehicle in the vehicle width direction, the load is efficiently transmitted from the suspension support to the main frame and side frame, and the vehicle body rigidity around the suspension support is effective. Can be improved. In particular, the closed cross section is connected over substantially the entire width of the upper surface of the main frame and the entire height of the side surface, so that the inflection point where the load concentrates on the intermediate portion of these surfaces is not formed, and the cross section of the main frame Deformation can be suppressed.
In addition, the closed cross-section portion is joined to the upper surface portion and the side surface portion of the main frame at the joint portion between the closed cross-section portion and the main frame where the bending moment is increased, thereby securing the cross section of the closed cross-section portion and the main frame. Falling with the closed cross section can be prevented.
(2) The main frame side end of the closed cross section is connected to a portion of the main frame where the reinforcing member is provided, so that the cross section of the main frame is deformed when a load is transmitted from the closed cross section to the main frame. Can be further reduced.
Further, since the closed cross-section portion is connected to the cross member via the reinforcing portion of the main frame, the relative displacement of the suspension support portion with respect to the cross member can be suppressed, and the suspension performance can be prevented from changing, thereby improving the running performance.
(3) The end portion on the side frame side of the closed cross-section portion wraps around the side portion of the suspension support portion and is disposed along the side frame, thereby further improving the support rigidity of the suspension support portion with respect to the side frame.

It is a side view in the Example of the vehicle body front part structure to which this invention is applied. It is the perspective view which looked at the vehicle body front part structure of the Example from the diagonally forward and diagonally upper side in the vehicle width direction (engine room side). It is the perspective view which looked at the vehicle body front part structure of an Example from the diagonally back and diagonally downward of the vehicle width direction outer side. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 1. It is a VV section arrow sectional view of Drawing 1. It is VI-VI part arrow directional cross-sectional view of FIG. It is a VII-VII section arrow sectional view of Drawing 5. It is a disassembled perspective view of the suspension support part in the vehicle body front part structure of an Example. It is typical sectional drawing which shows the connection structure to the main frame of the suspension support part and cross member in the vehicle body front part structure of an Example.

  The present invention has the object of providing a vehicle body front structure that effectively enhances the vehicle body rigidity in the suspension support portion, and a closed cross section that connects the upper surface and side surfaces of the main frame and the side frame along the front portion of the suspension support portion. The joint of the closed cross-section to the main frame is made to substantially coincide with the attachment location of the cross member reinforced by the separator, and the side frame end of the closed cross-section is turned to the side of the suspension support. It was solved by a configuration that can be used.

Embodiments of a vehicle body front structure to which the present invention is applied will be described below. The vehicle body front part structure of the embodiment is provided in a passenger car having an engine room in front of the cabin, for example.
The vehicle includes a cabin 10, a main frame 20, a cross member 30, a lower member 40, a suspension arm 50, a steering gear box 60, a stabilizer device 70, a side frame (upper frame) 80, a suspension support portion 100, and the like. Yes.

  The cabin 10 is a passenger compartment in which an occupant is accommodated. A toe board that is a partition wall between the cabin and the engine room is provided at the front end of the cabin 10.

  The main frame 20 is a structural member provided on the left and right sides of the engine room provided in front of the cabin 10. The main frame 20 has, for example, a substantially rectangular closed cross section, and the front half of the main frame 20 extends substantially along the longitudinal direction of the vehicle. Further, the rear half portion of the main frame 20 is formed to be bent in a substantially S shape, and is formed along the toe board front surface to the floor lower surface of the cabin 10 (floor panel lower surface).

Further, as shown in FIG. 9 and the like, a pipe nut 21 and a separator 22 are fixed inside the main frame 20.
The pipe nut 21 is a tube tube into which a bolt for fixing the cross member 30 is inserted and fastened. The pipe nut 21 is disposed with its central axis substantially along the vertical direction. For example, a pair of pipe nuts 21 are provided apart in the front-rear direction. The pipe nut 21 is joined to the lower surface of the main frame 20 by welding.
The separator 22 is a partition plate that is provided in front of and behind each of the pipe nuts 21 and partitions the inside of the main frame 20 in the front and back. As shown in FIG. 4, the upper end and the side end of the separator 22 are joined to the inner surface of the main frame 20 by, for example, spot welding. The separator 22 is a reinforcing member that suppresses cross-sectional deformation of the main frame 20 in the vicinity of the pipe nut 21.

The cross member 30 is a horizontal beam-like structural member arranged in the front half of the left and right main frames 20. The left and right end portions of the cross member 30 are coupled to the lower surface portions of the left and right main frames 20, respectively. The cross member 30 protrudes downward from the lower surface of the front half of the main frame 20.
As will be described later, a suspension arm 50 and a steering gear box 60 are attached to the cross member 30, and a power train such as an engine and a transmission (not shown) is coupled through a mount having an elastic body.

  The lower member 40 is a beam-like structural member (subframe) that is disposed below the main frame 20 and is disposed substantially along the vehicle front-rear direction.

  The suspension arm 50 is attached to the vehicle body so as to be swingable about an axis substantially along the front-rear direction, and supports a lower end portion of a housing (not shown) that supports the front wheel W (see FIG. 5 and the like).

  The steering gear box 60 includes, for example, a rack and pinion mechanism, and a rotation of a steering wheel (not shown) is input via a steering shaft or the like, and is converted into a reciprocating motion in the vehicle width direction.

The stabilizer device 70 suppresses rolls by generating a restoring force when the suspension of the left and right front wheels strokes in the opposite phase when the vehicle is turning.
The stabilizer device 70 includes a stabilizer bar 71, a stabilizer bush 72, a bracket 73, and the like.

  The side frame 80 is a beam-like member that extends from the bulkhead provided at the upper portion of the front end partition of the cabin 10 to the front side along both ends of a hood (not shown).

The suspension support portion 100 is a portion that supports the upper end portion of the strut S (see FIG. 5 and the like) of the McPherson strut suspension. The suspension support portion 100 is formed between the main frame 20 and the side frame 80. The strut is a unit consisting of a coil spring and a shock absorber partially inserted on the inner diameter side thereof, and a housing is fixed to a lower end portion thereof.
As shown in FIG. 8, the suspension support unit 100 includes a bracket upper 110, a bracket lower 120, a wheel apron 130, a side frame upper 140, a side frame lower 150, a side frame outer 160, a separator 170, a rein hose upper 180, and a rein hose. A lower 190, a rein hose front 200, a rein hose rear 210 and the like are provided.
Each of these members is formed by pressing a steel plate and joined to each other by spot welding or the like.

  The bracket upper 110 is a receiving surface portion to which the top mount portion of the strut is fixed, and is formed by bending the outer peripheral edge portion of the annular and flat mounting surface portion downward into a flange shape. The mounting surface portion is formed by dispersing, for example, three bolt holes into which the fixing bolt protruding upward from the top mount portion of the strut is inserted in the circumferential direction.

  The bracket lower 120 is a member that connects the outer peripheral edge of the bracket upper 110 on the inner side in the vehicle width direction and the upper end of the main frame 20 on the outer side in the vehicle width direction. The bracket lower 120 is formed so as to also wrap around the front edge and the rear edge of the bracket upper 110, and the cross-sectional shape viewed along the horizontal plane is substantially U-shaped with the vehicle width direction outer side opened. .

  The wheel apron 130 is a part that is joined to the rear end of the bracket lower 120 and constitutes a part of the wheel house that houses the front wheel W.

As shown in FIG. 5, the side frame upper 140, the side frame lower 150, and the side frame outer 160 cooperate to form a closed cross-section S <b> 1 extending in the vehicle longitudinal direction outside the bracket upper 110 in the vehicle width direction. It is. The closed cross section S1 constitutes a part of the side frame 80.
The side frame upper 140 is a portion constituting the upper surface portion of the closed cross-sectional portion S1 and the upper portion of the side surface portion on the inner side in the vehicle width direction.
The side frame lower 150 is a portion constituting the lower surface portion of the closed cross-sectional portion S1 and the lower portion of the side surface portion on the inner side in the vehicle width direction.
Flange portions projecting inward in the vehicle width direction are provided at the end portions of the side frame upper 140 and the side frame lower 150 in the vehicle width direction, and these flange portions are overlapped with each other on the upper surface portion of the bracket upper 110. It is placed and joined by spot welding.

The side frame outer 160 is a portion that constitutes a side surface portion on the outer side in the vehicle width direction of the closed cross section S1. Flange which is a welding margin is formed at the upper end portion and the lower end portion of the side frame outer 160, and these are joined to the end portions on the outer side in the vehicle width direction of the side frame upper 140 and the side frame lower 150, respectively.
The separator 170 is a partition plate provided inside the closed cross section S1 formed by the side frame upper 140, the side frame lower 150, and the side frame outer 160, and suppresses deformation of the cross section of the closed cross section S1. is there.

The rein hose upper 180 and the rein hose lower 190 form a closed cross-section S2 that connects the main frame 20 and the side frame 80 on the front side of the bracket upper 110 in cooperation with the bracket lower 120 and the like.
The reinhose upper 180 constitutes an upper surface portion of the closed cross-section portion S2, a side surface portion on the inner side in the vehicle width direction, and a part of the front surface portion. In addition, the reinhose lower 190 constitutes a part of the lower surface portion, the side surface portion on the outer side in the vehicle width direction, and the front surface portion of the closed section S2. Further, the front surface portion of the bracket lower 120 constitutes the rear surface portion of the closed cross section S2.

  As shown in FIG. 4, the end of the closed cross section S2 on the side frame 80 side is formed continuously with the front end of the closed cross section S1. Further, the end of the closed cross section S2 on the main frame 20 side is connected to the side surface portion of the main frame 20 on the outer side in the vehicle width direction over the entire height.

As shown in FIG. 4 and the like, the reinhose front 200 includes an upper surface portion of the main frame 20 and an end portion on the inner side in the vehicle width direction of the closed cross-sectional portion S2 (reinhose upper 180) disposed above the main frame 20. It is a member to connect. The reinhose front 200 forms a closed cross section S3 that connects the end of the closed cross section S2 in the vehicle width direction and the upper surface of the main frame 20.
As shown in FIG. 4, the reinhose front 200 is formed in a substantially triangular gusset shape as viewed from the front of the vehicle. Further, the reinhose front 200 has a substantially U-shaped cross-sectional shape in which a main part excluding a welding margin (flange) part provided at an outer peripheral edge thereof is cut in a horizontal plane, and an outer side in the vehicle width direction is opened. The closed cross section S3 described above is provided inside this.
The reinhose front 200 is joined to the upper surface of the main frame 20 over its entire width.

  In the present embodiment, with such a configuration, the closed cross section S2 and the closed cross section S3 are connected, one end is connected to the side frame 80, and the other end is the upper surface of the main frame 20. A closed cross-section portion connected to the entire width and connected to the side surface portion of the main frame 20 on the outer side in the vehicle width direction is formed.

  The rear hose rear 210 is a gusset-like member that is provided in the vicinity of the joint portion with the main frame 20 at the rear portion of the bracket lower 120 and is provided between the side surface portion of the bracket lower 120 and the upper surface portion of the main frame 20. . A closed cross section S4 is formed between the rear hose rear 210 and the bracket lower 120 as shown in FIG.

  Here, in the present embodiment, as shown in FIG. 9, the joint location between the rein hose front 200 and the main frame 20 and the joint location between the rein hose rear 210 and the main frame 20 are described above. And the junction location of the separator 22. That is, the front and rear joints of the reinhose front 200 are disposed so as to overlap the upper ends of the separators 22 disposed before and after the front pipe nut 21. In addition, the front and rear joints of the rein hose rear 210 are disposed so as to overlap with the upper ends of the separators 22 disposed before and after the rear pipe nut 21.

At these joining locations, spot welding is performed by sandwiching the upper surface portion of the main frame 20 between the flange portions of the rein hoses 200 and 210 and the separator 22 to join them.
With this configuration, in this embodiment, the side frame 80 including the closed cross section S1 is connected to the main frame 20 via the closed cross sections S2 and S3, and further connected to the cross member 30 from here. A strong structure is formed.

According to the embodiment described above, the following effects can be obtained.
(1) It is disposed along the front end portion of the suspension support portion 100, one end portion is connected to the side frame 80, the other end portion is connected to the upper surface portion of the main frame 20 over the entire width, and the vehicle width of the main frame 20 By providing the closed cross-section portions S2 and S3 connected over the entire height on the side portion on the outer side in the direction, a load is efficiently transmitted from the suspension support portion 100 to the main frame 20 and the side frame 80, and the vehicle body around the suspension support portion 100 Stiffness can be effectively improved. In particular, the closed cross-section portions S2 and S3 are connected over the entire width of the upper surface and the entire height of the side surface of the main frame 20, so that the inflection point where the load concentrates on the intermediate portion of these surfaces is not formed. Cross-sectional deformation can be suppressed.
In addition, the closed cross section S2 is joined to the side surface of the main frame 20 at the joint portion between the closed cross section S2 and the main frame 20 where the bending moment increases, and the closed cross section S3 connected to the closed cross section S2 is provided. By joining to the upper surface of the main frame 20, the cross section of the closed cross section S2, S3 can be secured and the main frame 20 and the closed cross section S2, S3 can be prevented from rolling.
(2) The ends of the closed cross-section portions S2 and S3 on the main frame 20 side are connected to the main frame 20 where the separators 22 are provided, whereby the load is transmitted from the closed cross-section portions S2 and S3 to the main frame 20. It is possible to further reduce the cross-sectional deformation of the main frame 20 when it is done.
In addition, the closed cross-section portions S2 and S3 are connected to the cross member 30 via the reinforcement portion of the main frame 20, thereby suppressing the relative displacement of the suspension support portion 100 with respect to the cross member 30 and preventing the change of the suspension geometry. Driving performance can be improved.
(3) The end of the closed section S2 on the side frame 80 side is formed continuously with the closed section S1 provided on the side of the suspension support section 100 and arranged along the side frame 80. As a result, the support rigidity of the suspension support portion 100 with respect to the side frame 80 can be further improved.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
(1) The detailed configuration of the vehicle body front structure, the shape and structure of each member (panel assembly, etc.) are not limited to the above-described embodiments, and can be changed as appropriate.
(2) In the embodiment, the closed cross-section portion that connects the side frame and the main frame is provided along the front side of the suspension support portion. However, the present invention is not limited to this, and it may be provided on the rear side of the suspension support portion. Furthermore, you may provide before and behind a suspension support part.

DESCRIPTION OF SYMBOLS 10 Cabin 20 Main frame 30 Cross member 40 Lower member 50 Suspension arm 60 Steering gear box 70 Stabilizer device 71 Stabilizer bar 72 Stabilizer bush 73 Bracket 80 Side frame 100 Suspension support part 110 Bracket upper 120 Bracket lower 130 Wheel apron 140 Side frame upper 150 Side Frame lower 160 Side frame outer 170 Separator 180 Rein hose upper 190 Rein hose lower 200 Rein hose front 210 Rein hose rear S Strut W Front wheel

Claims (3)

A main frame provided at a side portion of the engine room and extending substantially along the front-rear direction and having a rear end connected to the front end of the vehicle compartment;
A side frame that is disposed at a high position on the outer side in the vehicle width direction with respect to the main frame and extends substantially along the front-rear direction;
A vehicle body front structure comprising: a suspension support portion provided between the main frame and the side frame and to which a shock absorber upper end portion of a suspension is fixed;
The suspension support portion is disposed along the front end portion or the rear end portion, and one end portion is connected to the side frame, and the other end portion is connected to the upper surface portion of the main frame over substantially the entire width, and A vehicle body front structure characterized by having a closed cross-sectional portion connected to a side surface portion on the outer side in the vehicle width direction of the frame over substantially the entire height. A lower structural member coupled to a lower portion of the main frame;
A reinforcing member provided at a joint portion of the main frame with the lower structural member to suppress cross-sectional deformation of the main frame;
The vehicle body front part structure according to claim 1, wherein an end of the closed cross section on the main frame side is connected to a portion of the main frame where the reinforcing member is provided. 3. The vehicle body according to claim 1, wherein an end of the closed cross-section portion on the side frame side wraps around a side portion of the suspension support portion and is arranged along the side frame. Front structure.

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