JP2000211555A - Vehicular chassis frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular chassis frame structure which can ensure sufficient crash stroke and give a fixing rigidity of each equipment part, and which is excellent in productivity. SOLUTION: This structure comprises a pair of side frames 11 extending in a longitudinal direction of a vehicular body. A first sub-frame 12 and a second sub-frame 13 are connected to a front part of each side frame 11, branch off, and are connected to a front cross member at a front part of each sub- frame 12, 13. A connecting part reinforcement member 20 which consists of an upper gusset 21 and a lower gusset 31 is placed at a connecting part of the side frame 11, the first sub-frame 12 and the second sub-frame 13, and equipment including a tie-down hook 41, a steering gearbox guard bar 43 and a stabilizer holding bracket are mounted and supported on the lower gusset 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chassis frame structure for a vehicle, and more particularly, to a vehicle having a plurality of sub-frames that extend from a front portion of a side frame and are provided between a side frame and a front cross member. Regarding the chassis frame.

[0002]

2. Description of the Related Art A chassis frame for a vehicle, for example, is disclosed in
As disclosed in JP-A-83678 and JP-A-6-201770, a front cross member is provided between the front ends of the left and right side frames, and both ends of the front cross member are bent outward in the vehicle width. Extending.

[0003] A sub-frame, which is arranged obliquely with respect to the front-rear direction of the vehicle body, is provided between the outer surface near the front portion of the side frame and the vicinity of the end of the front cross member. By preventing deformation, an impact load acting from a wide range of directions from the front or obliquely forward direction of the vehicle is transmitted to the side frames and distributed to the entire chassis frame.

[0004] Another structure of this type of vehicle chassis frame includes a pair of side frames 101 extending along right and left sides of the vehicle body as shown in, for example, a front perspective view of the chassis frame 100 in FIG. A first sub-frame 102 and a second frame 10 at the front end of each side frame 101, respectively.
3 are connected, the front part is branched, and each first sub-frame 10
Both ends 104a of the front cross member 104 erected between the two are joined to the front end of the second sub-frame 103, respectively, and the cross members 105, between the vicinity of the rear end of the first sub-frame 102 and between the side frames 101, respectively. 1
A strut bracket 107 for supporting an upper end of a strut (not shown) of a strut type suspension is provided on each side frame 101.

The joint between each side frame 101 and the first and second sub-frames 102 and 103 is formed by welding the side frame 101, the first sub-frame 102 and the second sub-frame 103 together, as shown in FIG. As shown in an enlarged perspective view of a portion C in FIG. 4 in which the cross member 105 is omitted, an upper surface portion 111 that covers the upper surface of the coupling portion and a side frame 101 that is bent downward from a side end of the upper surface portion 111 to form An upper gusset 110 having a side surface portion 112 covering an upper area of each side surface of the first sub-frame 102 and the second sub-frame 103 is fitted from above, and is drilled at an edge of the upper gusset 110 and an upper surface portion 111. The peripheral edge of the welding hole 111a is the side frame 101, the first
The sub-frame 102 and the second sub-frame 103 are welded to each other.

On the other hand, a lower surface portion 114 covering the lower surface of the connecting portion
And a side surface portion 11 that is bent upward from a side end of the lower surface portion 114 and covers a lower range of each side surface of the side frame 101, the first sub-frame 102, and the second sub-frame 103.
The lower gusset 113, which is substantially symmetrical with the upper gusset 110 and has a lower portion 5, is fitted from below, and a peripheral edge of a welding hole (not shown) formed in an edge of the lower gusset 113 and the lower surface portion 114. Are welded to the side frame 101, the first sub-frame 102, and the second sub-frame 103, and the upper gusset 110 and the lower gusset 113 increase the joint rigidity between the side frame 101, the first sub-frame 102, and the second sub-frame 103. Is secured.

Further, a substantially U-shaped tie-down hook 116 is attached to the outer surface of the first sub-frame 102, and the first sub-frame 102 is provided with a steering gear box (not shown) for protecting the same from grounding or the like. A steering gear box guard bar (not shown) protrudes in front of the steering gear box.

Further, a stabilizer bracket 117 for holding the stabilizer 118 is attached to the rear end of the lower gusset 113 so as to avoid the welding hole in order to secure the welding work space from the welding hole. For this reason, the lower part of the stabilizer bracket 117 to which the stabilizer 118 is attached is formed so as to be biased so as to protrude forward with respect to the joint with the lower gusset 113.

[0009]

According to the vehicle chassis frame, the front cross member 104 is provided at the front end of the side frame 101 via the first side frame 102.
And a second sub-frame 103 is erected between the side frame 101 and the end 104a of the front cross member 104, and the side frame 101
, A first subframe 102 and a second subframe 10
3 is reinforced by the upper gusset 110 and the lower gusset 113 to secure the connection rigidity of the connection.

As a result, when an impact load acts on the front cross member 104 from the front and diagonally forward, the impact load can be transmitted to the side frame 101.

However, for example, the front cross member 10
When a predetermined or greater impact load is applied to the chassis frame 4 from the front, the chassis frame 100 is gradually crushed from the front end of the first sub-frame 102, but the tie-down hook 116 and the welding joint of the steering gear box guard bar are
The rigidity is increased by the tie-down hook 116 and the steering gear box guard bar which require rigidity, and the deformation of the portion is prevented, and the smooth collapse of the first sub-frame 102 may be prevented, so that a sufficient crash stroke may not be secured. is there.

Further, the tie-down hook 116, the steering gear box guard bar,
Since the impact load acting on the stabilizer bracket 117 and the like is transmitted to the chassis frame 100 via each joint, a large joint strength is required for the joint.

On the other hand, outfitting parts such as a stabilizer bracket 117, a tie down hook 116, a steering gear box guard bar and the like are separately and independently attached to the first sub-bracket 102, the lower gusset 113, and the like, and these outfitting parts are welded and connected. In addition to the fact that the work space for performing the work is limited, there is a concern that the work space is cumbersome and has many man-hours.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention, which has been made in view of the above points, is to provide a chassis frame structure for a vehicle in which a sufficient crash stroke is ensured, mounting rigidity of each outfitting component is obtained, and the productivity is excellent. It is in.

[0015]

According to a first aspect of the present invention, there is provided a vehicle chassis frame structure having a pair of side frames extending in a front-rear direction of a vehicle body. The first sub-frame and the second sub-frame are joined and branched, and the front portions of the first and second sub-frames are respectively joined to front cross members extending in the vehicle width direction, and the side frames In a vehicle chassis frame structure in which a connecting portion reinforcing member is provided at a connecting portion between the first sub-frame and the second sub-frame, an outfitting part including at least a tie-down hook is mounted and supported on the connecting portion reinforcing member. It is characterized by the following.

According to the first aspect of the present invention, the outfitting parts including the tie down hooks requiring rigidity are intensively attached and supported on the joint reinforcing members requiring strength. The rigidity is improved by being stiffened by the outfitting parts such as the down hooks, and the attachment of the outfitting parts such as the tie down hooks is abolished from the first sub-frame and the like, and the increase in the rigidity of the first sub-frame and the like is avoided. . As a result, when an impact load of a predetermined value or more is applied to the front portion of the first sub-frame from the front, the first sub-frame is smoothly crushed from the front end portion, and the crash stroke of the front portion of the chassis frame is secured. Sufficient load absorption is provided to mitigate impact and improve safety.

On the other hand, it is possible to reliably transmit the impact load acting on the outfitting parts due to grounding or the like to the portion of the chassis frame reinforced by the connecting portion reinforcing member, and to distribute the impact load to the entire chassis frame. It becomes possible to communicate.

In addition, it becomes possible to attach each outfit part to the joint reinforcing member in advance, so that the work space required for the installation work of each outfit part can be easily secured, and the connection rigidity of the outfit parts can be easily secured. Good productivity results.

According to a second aspect of the present invention, in the vehicle chassis frame structure of the first aspect, the connecting portion reinforcing member is provided on each of the upper surfaces of the side frame, the first sub-frame, and the second sub-frame at the connecting portion. An upper surface portion to be welded and connected by polymerization, an inner surface portion bent downward from an inner end of the upper surface portion and to be welded and bonded to each inner surface of the side frame and the first subframe; An upper gusset having an outer surface portion bent downward from the outer end of the upper surface portion and overlapped and welded to each of the outer surfaces of the side frame and the second subframe; A lower surface portion overlapped and welded to each lower surface of the first sub-frame and the second sub-frame, and bent upward from an inner end of the lower surface portion to form the side frame and the first sub-frame; An inner side surface portion that is welded and bonded to each inner side surface of the sub-frame; and an upper surface that is bent upward from the outer end of the lower surface portion and overlapped and welded to each outer side surface of the side frame and the second sub-frame. And a lower gusset having an outer surface portion to be formed.

According to a second aspect of the present invention, there is provided the connecting portion reinforcing member according to the first aspect, wherein the connecting portion between the sub-frame, the first sub-frame and the second sub-frame is gusseted from above. And the upper gusset and the lower portion where the connecting portions of the sub-frame, the first sub-frame and the second sub-frame are opposed to each other by fitting the lower gussets from below and welding them together. Strongly reinforced by gussets.

According to a third aspect of the present invention, in the vehicle frame structure of the second aspect, the tie-down hook is welded to an outer surface portion of the lower gusset in an overlapping manner.

According to the third aspect of the present invention, the tie-down hook and the lower gusset can be easily joined by welding and joining the tie-down hook to the outer surface of the lower gusset, and the tie-down hook can be easily connected. The lower gusset can be welded to the lower gusset in advance, so that a work space for mounting the tie-down hook is secured, and mounting workability is improved.

According to a fourth aspect of the present invention, in the vehicle chassis frame structure according to the second or third aspect, the lower surface of the lower gusset is perforated in the lower surface to form the side frame, the first sub-frame and the lower frame. Each of the lower surfaces of the second sub-frame has a plurality of welding holes whose peripheral edges are welded.

According to the fourth aspect of the present invention, the side frame formed by the lower gusset and the first sub-frame are formed by welding the periphery of the welding hole formed in the lower surface to the side frame, the first sub-frame and the second sub-frame. Frame and second
The rigidity of connection with the sub-frame is improved, and the effects of the first and second aspects are efficiently achieved.

According to a fifth aspect of the present invention, in the vehicle frame structure of the fourth aspect, the lower surface of the lower gusset supports the steering gear box guard bar by avoiding the welding hole on the lower surface. The guard bar mounting bracket is welded and connected.

According to the fifth aspect of the present invention, since the guard bar mounting bracket is attached to the lower surface while avoiding the welding hole, the periphery of the welding hole, the side frame, the first sub-frame, The welding connection with the second sub-frame becomes possible, and the guard bar mounting bracket can be welded to the lower gusset in advance, so that a work space for mounting the guard bar mounting bracket is secured and the mounting workability is improved. As a result, the connection rigidity of the guard bar mounting bracket can be easily secured.

According to a sixth aspect of the present invention, in the vehicle frame structure according to the fourth or fifth aspect, the lower surface of the lower gusset holds the stabilizer while avoiding the welding hole on the lower surface. The bracket is welded and connected.

According to the sixth aspect of the present invention, since the stabilizer holding bracket is attached to the lower surface while avoiding the welding hole, the periphery of the welding hole, the side frame, the first sub-frame, and the side frame are not affected by the stabilizer holding bracket. It becomes possible to weld the stabilizer holding bracket to the lower gusset in advance by welding with the second sub-frame, thereby securing a work space for mounting the stabilizer holding bracket and improving the mounting workability. At the same time, the coupling rigidity of the stabilizer holding bracket can be easily secured.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a chassis frame structure for a vehicle according to the present invention will be described below with reference to FIGS.

FIG. 1 is a front perspective view of the chassis frame 1,
2 is an exploded perspective view of a portion A in FIG. 1, and FIG. 3 is an enlarged view of a portion B in FIG. 2, and an arrow Fr indicates a front direction of the vehicle body.

The chassis frame 1 has a pair of side frames 11 extending along right and left sides of the vehicle body. The side frames 11 include an inner side surface 11a, an outer side surface 11b, and an inner side surface 11a and an outer side surface 11b. It has an upper surface 11c and a lower surface 11d connecting between the upper edges and between the lower edges, and is formed in a rectangular cross section extending in the vehicle longitudinal direction.

At the front of the side frame 11, a first sub-frame 12 and a second sub-frame each having a substantially rectangular section are welded and extended to the front of the inner side surface 11a and the outer side surface 11b of the side frame 11, respectively. 13, the first sub-frame 12 extends forward in substantially the same direction as the side frame 11 and has a front end joined to a cylindrical front cross member 14 extending in the vehicle width direction at the front of the vehicle body. ing.

On the other hand, the second sub-frame 13 extends obliquely forward so as to be deviated outwardly from the vehicle body as it moves forward from the front end of the side frame 11, and has a front end that extends from the end 14a of the front cross member 14 to the front end. It is connected near the end 14a.

A cross member 15 is provided between the vicinity of the rear end of the first left and right sub-frames 12 and between the two side frames 11.
And a strut bracket 17 that supports the upper end of a strut (not shown) of the strut type suspension is provided on the side frame 11 adjacent to the cross member 16.

Next, the structure of the joint between the side frame 11, the first sub-frame 12, and the second frame 13 will be described with reference to FIG. The structure of these left and right joints is substantially the same and has the same function except that a steering gear box guard bar 43 described later is not provided in the left joint, so that only the right joint will be described. I do.

As shown in FIG. 2 in an exploded perspective view of a portion A where the cross member 15 is omitted, an inner side surface 12a, an outer side surface 12b, an inner side surface 12a and an outer side surface The rear portion of the outer surface 12b of the first sub-frame 12 having a substantially rectangular cross section having an upper surface 12c and a lower surface 12d connecting the upper edge and the lower edge of the side frame 12b is overlapped and welded together, and the side frame 11 The front surface of the outer surface 11b has an inner surface 13a, an outer surface 13b, an upper surface 13c and a lower surface 13d that connect the upper surface of the inner surface 13a and the outer surface 13b and the lower surface thereof. The rear part of the inner surface 13a of the two sub-frames 13 is overlapped and welded.

Further, an upper gusset 21 fitted from above and welded to the connecting portion of the side frame 11, the first sub-frame 12, and the second frame 13, and fitted to the connecting portion from below. Lower gusset 31 to be welded
And a connecting portion reinforcing member 20 composed of:

The upper gusset 21 is provided with the side frame 11, the first sub-frame 12, and the second frame 13 of the connecting portion.
And a plurality of welding holes 22a are drilled, and the front portion of the first sub-frame 1
2 that branches off following the second and second sub-frames 13
2, an inner side surface portion 23 bent downward from the inner end of the upper surface portion 22 and continuously overlapping the upper areas of the inner side surfaces 11a and 12a of the side frame 11 and the first sub-frame 12, and an upper surface portion An outer surface portion 24 that is bent downward from the outer end of the outer surface 22 and continuously overlaps the upper areas of the outer surfaces 11b and 13b of the side frame 11 and the second sub-frame 13, and a front end central portion of the upper surface portion 22 It has a front side surface portion 25 which is bent downward and continuously overlaps the upper surface of the outer side surface 12 b of the first sub-frame 12 and the inner side surface 13 a of the second sub-frame 13.

On the other hand, the lower gusset 31 covers the lower surface of the joint portion with the side frame 11, the first sub-frame 12, and the second frame 13, and has a front portion in the first sub-frame 1.
2 and the lower surface portion 3 branched following the second sub-frame 13
2, an inner surface portion 33 that is bent upward from the inner end of the lower surface portion 32 and continuously overlaps the lower area of each of the inner surfaces 11a and 12a of the side frame 11 and the first subframe 12, and a lower surface portion An outer surface portion 34 bent upward from the outer end of the outer surface 32 and continuously superimposed on a lower area of the outer surfaces 11b and 13b of the side frame 11 and the second sub-frame 13, and a front end central portion of the lower surface portion 32 A front side portion 35 is formed to be bent upward and continuously overlaps a lower area of the outer side surface 12b of the first sub-frame 12 and the inner side surface 13a of the second sub-frame 13.

Further, a plurality of, three in this embodiment, three welding holes 32a are formed in the lower surface portion 32 of the lower gusset 31 in the width direction, and the welding holes 32b are spaced apart from the welding holes 32a and rearward. Are drilled.

The lower gusset 31 has a lower end 41a projecting downward from a lower end of the outer side surface portion 32 in advance at a front portion of the outer side surface portion 34 as shown in an enlarged view of a portion B in FIG. The U-shaped tie-down hook 41 is welded and connected with the end protruding upward.

On the other hand, a guard bar mounting bracket 42 for mounting a steering gear box guard bar 43 and a stabilizer mounting bracket 46
The front stabilizer base bracket 44 and the rear stabilizer base bracket 45, which serve as stabilizer holding brackets for attaching the rear brackets, are welded together avoiding the welding holes 32a and 32b.

More specifically, the guard bar mounting bracket 42 has a substantially U-shaped cross section including a mounting portion 42b formed by bending both ends of a base 42a upward. An insertion hole (not shown) is formed in the base 42a. ) Is drilled, the nut 42c is welded corresponding to the insertion hole, and both ends of the mounting portion 42b are welded to the lower surface portion 32 at positions forward of the welding holes 32a, so that the lower surface of the lower gusset 31 is formed. It is attached to the front of the part 32.

Front stabilizer base bracket 44
Has a substantially hat-shaped cross-section extending in the vehicle width direction in which both ends of a base 44a are bent upward and mounting flanges 44b are formed at upper ends thereof, and a pair of insertion holes (not shown) is formed in the base 44a. Are drilled, and nuts 4
4c is welded to the lower gusset 31 by welding a mounting flange 44b to a portion extending in the vehicle width direction between the welding holes 32a and 32b formed in the lower surface 32. ing.

Rear stabilizer base bracket 45
Has a substantially hat-shaped cross section extending in the vehicle width direction in which both ends of a base 45a are bent upward and mounting flanges 45b are formed at respective upper ends, and an insertion hole (not shown) is formed in the base 45a. A nut 45c is welded and connected to the insertion hole, and a mounting flange 45 is provided on the lower surface 32 behind the welding hole 32a and at a side portion of the welding hole 32b.
b is attached to the lower surface 32 of the lower gusset 31 by welding.

The upper gusset 21 thus formed
Is fitted into the connecting portion of the side frame 11, the first sub-frame 12, and the second frame 13 from above, and
Are the side frame 11, the first sub-frame 12, and the second
On each of the upper surfaces 11c, 12c, 13c of the frame 13, the inner side surface portion 23 is provided with the side frame 11 and the first sub-frame 1.
In the upper area of each of the inner surfaces 11a and 12a, an outer surface 2
4 is the upper area of the outer surfaces 11b and 13b of the side frame 11 and the second sub-frame 13, and the front side 25 is the upper area of the outer surface 12b of the first sub-frame 12 and the inner surface 13a of the second sub-frame 13. Are polymerized.

Then, the upper gussets 21 polymerizing with each other
The edges 22c, 22d, and 22e of the upper surface portion 22 are welded to the upper surfaces 11c, 12c, and 13c of the side frame 11, the first subframe 12, and the second subframe 13 by welding. The inner surfaces 11a and 12a of the side frame 11 and the first sub-frame 12, the peripheral edge 24a of the outer surface 24, the side frame 11, and the second
Outer side surfaces 11b and 13b of subframe 13, front side portion 2
5 and outer surface 12b of first subframe 12
And the inner surface 13a of the second sub-frame 13 are welded to each other. In other words, the entire periphery of the upper gusset 21 is welded to the side frame 11, the first sub-frame 12, and the second sub-frame 13 over the entire periphery.

Further, the peripheral edge of each welding hole 22a formed in the upper surface portion 22 of the upper gusset 21 and the upper surface 11c of the side frame 11, the first sub-frame 12, and the second sub-frame 13 overlapping the peripheral edge. The upper gusset 21 reinforces the connection between the side frame 11, the first sub-frame 12, and the second sub-frame 13 by welding and connecting the first and second sub-frames 12c and 13c.

On the other hand, the lower bracket 31 to which fitting parts such as the tie-down hook 41, the guard bar mounting bracket 42, the front stabilizer base bracket 44, and the rear stabilizer base bracket 45 are welded in advance is attached to the side frame 11, the first sub-frame 12 The lower surface 32 is fitted to the connecting portion of the second frame 13 from below, and the lower surface 32 is attached to the lower surfaces 11d, 12d, 13d of the side frame 11, the first sub-frame 12, and the second frame 13, respectively.
3 is located in the lower area of each of the inner surfaces 11a and 12a of the side frame 11 and the first sub-frame 12, and
4 is located in the lower area of the outer side surfaces 11b and 13b of the side frame 11 and the second sub-frame 13, and the front side surface portion 25
Are overlapped on the lower area of the outer surface 12b of the first sub-frame 12 and the inner surface 13a of the second sub-frame 13, respectively.

Then, the lower gussets 31 which overlap each other
Are welded to the edges 32c, 32d, 33e of the lower surface portion 32 and the lower surfaces 11d, 12d, 13d of the side frame 11, the first sub-frame 12, and the second sub-frame 13. The inner surfaces 11a and 12a of the side frame 11 and the first sub-frame 12, the peripheral edge 34a of the outer surface portion 34, the side frame 11, and the second
Outer side surfaces 11b and 13b of subframe 13, front side portion 3
5 and the outer surface 12b of the first sub-frame 12
And the inner surface 13a of the second sub-frame 13 by welding. In other words, the entire periphery of the lower gusset 31 is welded to the side frame 11, the first sub-frame 12, and the second sub-frame 13 over the entire periphery.

Further, the periphery of each of the welding holes 32a and 32b formed in the lower surface portion 32 of the lower gusset 31, the side frame 11, the first sub-frame 12,
Each lower surface 11d, 12d, 13d of the second sub-frame 13
And the side frame 11, the first sub-frame 12, and the second sub-frame 1 by the lower gusset 31.
3 and a tie-down hook 41 projecting upward from the upper end of the outer side surface portion 34.
Is welded to the outer surface 24 of the upper gusset 21 to improve the bonding strength of the tie-down hook 41.

Each of the welding holes 32 formed in the lower surface 32
a and 32b and the lower surface 11d of the side frame 11, the first sub-frame 12, and the second sub-frame 13,
For welding work with 12d and 13d, use tie down hook 4
1. Since the outfitting parts such as the guard bar mounting bracket 42, the front stabilizer base bracket 44, and the rear stabilizer base bracket 45 are attached to the lower gusset 31 while avoiding the welding holes 32a and 32b, respectively.
It does not hinder the welding connection work.

Next, the steering gear box guard bar 43 is attached to the front bar base bracket 44 and the rear stabilizer base bracket 45 by bolts (not shown) which are screwed into nuts 42c welded to the guard bar mounting bracket 42. The stabilizer 49 is attached and supported by the stabilizer bracket 46, the stabilizer support bracket 47 and the bush 48.

The stabilizer bracket 46 is provided in the position shown in FIG.
As shown in FIG. 5, a pair of insertion holes (not shown) are formed, and both ends of a base 46a to which nuts 46b are welded and connected are bent upward to correspond to the insertion holes, and a mounting flange is formed at the upper end. A nut 44c of the front stabilizer base bracket 44 and the rear stabilizer base bracket 45, which has a substantially hat-shaped cross section extending in the front-rear direction and has a 46c formed therein, is inserted into a bolt insertion hole 46d formed in the mounting flange 46c. And 45c are mounted on the lower surfaces of the front stabilizer base bracket 44 and the rear stabilizer base bracket 45 by bolts (not shown) that are screwed into the brackets 45c and 45c.

Further, the mounting flange 47a of the stabilizer support bracket 47 for rotatably supporting the stabilizer 49 via the bush 48 is provided on the stabilizer bracket 4
The base 46a of the stabilizer bracket 46 is secured by a bolt (not shown) that is screwed into the nut 46b of the sixth bracket from below.
Attached to the lower surface of the.

Therefore, the stabilizer 49 is attached to the stabilizer bracket 46 bridged between the front stabilizer base bracket 44 and the rear stabilizer base bracket 45 by the front stabilizer base bracket 44 in plan view.
And the rear stabilizer base bracket 45 and is firmly held.

According to the thus formed chassis frame structure for a vehicle, the connecting portion reinforcing member 20 for stiffening the connecting portion where the first sub-frame 12 and the second sub-frame 13 are connected to the front portion of the side frame 11. Lower gusset 21
Outfitting components such as a tie-down hook 41, a guard bar mounting bracket 42 for mounting and supporting the steering gear box guard bar 43, and front and rear stabilizer base brackets 44 and 45 for mounting and supporting the stabilizer 49 are intensively mounted. The down hook 41, the steering gear box guard bar 43, the stabilizer 49 and the like prevent the rigidity of the first sub-frame 12 from increasing.

Therefore, when an impact load of a predetermined value or more acts on the front portions of the first sub-frame 12 and the second sub-frame 13 from the front via the front cross member 14 and the like, the mounting of the outfitting parts is affected. Without this, the first sub-frame 12 is smoothly crushed from the front end of the vehicle body, and a sufficient crash stroke is secured, so that the safety of the occupant is greatly improved.

Also, tie-down hooks 41 are formed on the outer surface 34 of the lower gusset 31 and welding holes 32a, 3
2b, the outfit parts such as the guard bar mounting bracket 42, the front stabilizer base bracket 44, and the rear stabilizer base bracket 45 can be welded and connected in advance, and a work space for mounting these outfit parts can be easily secured. Outfitting parts are provided at the joints of the side frame 11, the first sub-frame 12, and the second sub-frame 13, which are excellent in workability and secured by the joint reinforcing member 20 of the upper gusset 21 and the lower gusset 31. Since the lower gusset 31 is firmly connected to the tie-down hook 41, the steering gear box guard bar 43, the stabilizer bracket 46, and other outfit components such as a thrust load due to grounding or the like, the impact load such as a thrust load is applied to the side frame 11. 1 subframe 12, 2nd subframe 1 Or the like can be dispersed and transmitted throughout the chassis frame 1 via.

In the above embodiment, the side frame 11
The front end of the front frame and the front cross member 14 are connected via the first sub-frame 12, but the front end of the side frame 11 is extended forward and connected to the front cross member 14 to eliminate the first sub-frame 12. Body frame 1
The outfitting parts attached to the lower gusset 31 can be appropriately added or reduced as required, and the present invention is limited to the above embodiment. However, various changes can be made without departing from the spirit of the present invention.

[0061]

According to the vehicle frame structure of the present invention described above, the fitting parts including the tie-down hooks are intensively attached and supported on the joint reinforcing members requiring strength, so that the joint reinforcing members are provided. Is stiffened by the outfitting parts and the rigidity is improved, and the mounting of the outfitting parts does not increase the rigidity of the first subframe or the like, and an impact load of a predetermined value or more acts on the front of the first subframe from the front. In this case, it is smoothly crushed from the front end of the first sub-frame without being affected by the attachment of outfitting parts, the crash stroke at the front of the chassis frame is secured, and the impact load is sufficiently absorbed to improve safety Is brought.

Further, it is possible to reliably transmit the impact load acting on the outfitting parts due to the grounding to the portion of the chassis frame reinforced by the connecting portion reinforcing member, and to distribute the impact load to the entire chassis frame. Can be transmitted. In addition, it becomes possible to attach each outfit part to the joint reinforcing member in advance, and it is possible to easily secure the work space required for the installation work of each outfit part, and to easily secure the connection rigidity of the outfit parts, thereby achieving excellent production. It greatly contributes to the safety of the vehicle and the field of manufacturing the vehicle, for example.

[Brief description of the drawings]

FIG. 1 is a front perspective view of a chassis frame showing an outline of an embodiment of a chassis frame structure for a vehicle according to the present invention.

FIG. 2 is an exploded perspective view of a portion A in FIG.

FIG. 3 is an enlarged view of a portion B in FIG.

FIG. 4 is a front perspective view of a chassis frame showing an outline of a conventional chassis frame structure for a vehicle.

FIG. 5 is an enlarged view of a portion C in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Chassis frame 11 Side frame 11a Inner surface 11b Outer surface 11c Upper surface 11d Lower surface 12 First subframe 12a Inner surface 12b Outer surface 12c Upper surface 12d Lower surface 13 Second subframe 13a Inner surface 13b External surface 13c Upper surface 13d Lower surface 14 Front cross member Reference Signs List 20 coupling portion reinforcing member 21 upper gusset 22 upper surface 22a welding hole 23 inner surface 24 outer surface 25 front side 31 lower gusset 32 lower surface 32a welding hole 32b welding hole 33 inner surface 34 outer surface 35 front side 41 tie-down hook 42 Guard bar mounting bracket 43 Steering gear box guard bar 44 Front stabilizer base bracket (stabilizer holding bracket) 45 Rear stabilizer base bracket (stabilizer holding bracket) Tsu g) 46 stabilizer bracket 47 stabilizer support bracket 48 bush 49 stabilizer

Claims (6)

[Claims] 1. A vehicle comprising a pair of side frames extending in the front-rear direction of a vehicle body, a first sub-frame and a second sub-frame joined to a front portion of each side frame and branched, and the first sub-frame and the first sub-frame. Each front part of the two sub-frames is connected to a front cross member extending in the vehicle width direction, and a connection part reinforcing member is provided at a connection part between the side frame, the first sub-frame, and the second sub-frame. A chassis frame structure for a vehicle, wherein an outfitting part including at least a tie-down hook is mounted and supported on the coupling portion reinforcing member. 2. The joining portion reinforcing member comprises: an upper surface portion which is welded to the upper surfaces of the side frame, the first sub-frame, and the second sub-frame by being overlapped with each other at the coupling portion; and an inner end of the upper surface portion. An inner side surface portion bent downward and overlapped and welded to each inner side surface of the side frame and the first subframe; and the side frame and the first side portion bent downward from an outer end of the upper surface portion. An upper gusset having an outer surface portion overlapped and welded to each outer surface of the two subframes; and an upper gusset overlapped and welded to each lower surface of the side frame, the first subframe and the second subframe at the joint portion. An inner surface portion bent upward from an inner end of the lower surface portion and overlapped and welded to each inner surface of the side frame and the first subframe; 2. A lower gusset having an outer surface portion bent upward from an outer end of the surface portion and overlapped and welded to each outer surface of the side frame and the second subframe. 4. The chassis frame structure for a vehicle according to 1. 3. The chassis frame structure for a vehicle according to claim 2, wherein the tie-down hook is overlapped and welded to an outer surface of the lower gusset. 4. A lower surface portion of the lower gusset has a plurality of welding holes drilled in the lower surface portion and having peripheral edges welded to respective lower surfaces of the side frame, the first sub-frame, and the second sub-frame. 3. The method according to claim 2, wherein
Or a chassis frame structure for a vehicle according to item 3. 5. The lower surface portion of the lower gusset, wherein a guard bar mounting bracket for mounting and supporting a steering gear box guard bar while avoiding the welding hole is welded to the lower surface portion. Chassis frame structure for vehicles. 6. The vehicle according to claim 4, wherein a lower surface portion of the lower gusset is welded to the lower surface portion with a stabilizer holding bracket that holds the stabilizer while avoiding the welding hole. Chassis frame structure.