JP3272269B2 - Front chassis frame and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a chassis member to a vehicle body in a double-girder front chassis frame of a vehicle.

[0002]

2. Description of the Related Art In a conventional vehicle-girder front chassis frame, a chassis member using a round pipe,
For example, a round pipe front cross member 1 illustrated in FIGS. 6 and 7 arranged in the vehicle width direction inserts a short round pipe 3 into a through hole 2 that is bored in upper and lower diametric directions at left and right ends, respectively. The outer peripheral surface of the front cross member 1 and the outer peripheral surface of the pipe 3 are welded, and a mounting bolt 4 inserted through the inside of the pipe 3 from below is screwed into the upper vehicle body 5 so that the front cross member 1 is attached to the lower surface of the vehicle body 5. However, it is relatively difficult to perform a drilling operation on the round pipe-shaped front cross member 1 in an accurate position and direction. At the same time, it is relatively difficult to increase the mounting pitch and positioning accuracy between the front cross member 1 and the right and left pipes 3 so that they are completely vertical. When attached is not, when fitted with a front chassis frame to the vehicle body 5, or cause harmful internal stresses twisted front cross member 1, and
There is a problem that the bent central portion swings right and left.

Further, for the reason that the front cross member 1 is bent for layout with respect to the vehicle body, as shown in FIG. 8, pipes 3 arranged vertically with the end of the front cross member 1 are arranged. If they are not orthogonal to each other, it is more difficult to drill a hole in the correct position and direction with respect to the round pipe-shaped front cross member 1 and to set the left and right pipes 3 in the vertical direction. Therefore, the above-mentioned inconvenience may easily appear.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to accurately position and fix a pipe to be attached to a vehicle body to a pipe chassis member in a double-girder front chassis frame of a vehicle.

[0005]

According to the present invention, there is provided a front chassis frame according to the first aspect of the present invention, wherein a pipe for attachment to a vehicle body is provided on a side surface of a pipe-made chassis member. Brackets extending vertically in contact with and abutting against the outer peripheral surface of the mounting pipe are welded to the outer peripheral surface of the chassis member and the outer peripheral surface of the mounting pipe, respectively.

That is, a pipe for attachment to a vehicle body is welded to the side surface of a pipe-made chassis member in a double-girder front chassis frame of a vehicle via a bracket, and the chassis member is inserted without opening a through-hole of the attachment pipe to the chassis member. Since the mounting pipe is fixed to the chassis member, by directly regulating the relative relationship between the chassis member and the mounting pipe in advance, it is possible to always and easily fix the mounting pipe to the chassis member at the correct position and direction. become able to.

According to a third aspect of the present invention, there is provided a method for manufacturing a front chassis frame, comprising: attaching a pipe for attachment to a vehicle body to a side surface of a pipe-made chassis member of a cross beam-shaped front chassis frame of a vehicle; The mounting pipe is extended vertically and a bracket is brought into contact with the outer peripheral surface of the mounting pipe, and the mounting pipe is fixed to a setting position of the mounting pipe with respect to the chassis member. The outer peripheral surface of the chassis member and the outer peripheral surface of the bracket and the mounting pipe are welded to each other.

Accordingly, the mounting pipe is set in contact with the side surface of the chassis member so that the mounting pipe extends vertically, and a mounting jig for the entire front chassis frame is used to set the mounting pipe to the chassis member. The mounting pipe is fixed to the chassis member via the bracket with the mounting pipe fixed to the position, and the direction and position of the mounting pipe fixed to the chassis member are correctly regulated, so the mounting It is possible to always and easily fix the fixing direction and the fixing position of the utility pipe, and thus the productivity of the front chassis frame can be easily increased.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in each embodiment of the present invention, the same parts will be denoted by the same reference characters. 1 to 4, a front chassis frame 10 of a vehicle includes a square pipe front cross member 11 disposed in the vehicle width direction, left and right round pipe side members 12 disposed in the vehicle front-rear direction, respectively, and a vehicle width. The left and right ends of the front cross member 11 and the front ends of the left and right side members 12 are connected via connect brackets 14, respectively. Member 13
The left and right end portions of the front chassis member are connected to the rear portions of the left and right side members 12, respectively, so that the front chassis frame 10 is formed in a cross-girder shape.

On the outer surface of the front end of each side member 12,
A round pipe 20 for attachment to the vehicle body 15 abuts and extends vertically, and a curved sheet metal bracket 21 covers the outer peripheral surface of the round pipe 20 to hold the round pipe 20. Both edges 22 in the front-rear direction
Are welded to the outer peripheral surface of the side member 12,
Both ends 24 of the window 23 formed in the bracket 21 in the vehicle front-rear direction are welded to the outer peripheral surface of the round pipe 20.

The above-mentioned device is manufactured by using a jig for positioning a mounting hole at the rear end of the side member 12 with respect to the vehicle body and a mounting hole of another front chassis member with respect to the vehicle body as a whole. A relatively short round pipe 20 is brought into contact with the outer surface of the front end of the round pipe 20 so that the round pipe 20 extends vertically, and the outer peripheral surface of the round pipe 20 is covered with a bracket 21 so as to hold the round pipe 20. Then, a jig (not shown) is inserted into the round pipe 20 to accurately regulate the vertical direction of the round pipe 20, and
After accurately positioning the round pipe 20 at the set position of the round pipe 20 with respect to the side member 12, in that state,
Welding of the bracket edge 22 to the outer peripheral surface of the side member 12, and the edge 24 of the bracket window 23 and the round pipe 20
The welding is performed by fixing the round pipe 20 to the side member 12 via the bracket 21 at the same time.

Accordingly, the upper surface of the round pipe 20 is brought into contact with the lower surface of the vehicle body 15, and the bolt 26 inserted into the round pipe 20 from below is screwed into the weld nut 27 on the vehicle body 15 side, thereby forming the side member 12. Front end is body 15
Will be accurately attached to the lower surface of the.

In the above apparatus, since the round pipe 20 is fixed to the side surface of the side member 12 via the bracket 21 and the round pipe 20 is not fixed using the insertion hole formed in the side member 12, Side member 12
Is made of a round pipe, the jig or the like inserted into the round pipe 20 is used to position the round pipe 20 from the mounting reference plane of the front chassis frame 10 with respect to the vehicle body 15 so that the round pipe 20 It is relatively easy to precisely regulate the vertical direction of the round pipe 20 and to accurately set the round pipe 20 at the set position of the round pipe 20 with respect to the side member 12, so that the bracket edge 22 and the side member 12 and the outer peripheral surface of the round pipe 20 and the edge 24 of the bracket window 23 are simultaneously welded, so that the round pipe 20 can always and easily be positioned accurately and vertically with respect to the side member 12. And the bracket 2
1 is configured to cover and hold the round pipe 20, so that the round pipe 20 can be easily and strongly fixed to the side member 12, and therefore, depending on the processing and finished state of the entire front chassis frame 10. The positional accuracy of mounting the front chassis frame 10 to the affected vehicle body 15 can be favorably secured.

That is, regardless of whether or not the side member 12 is bent, the accuracy of fixing the round pipe 20 to the side member 12 can be easily increased, and as a result, the front chassis in which the round pipe 20 is fixed to the side member 12 can be obtained. There is a great advantage that the productivity of the frame 10 can be remarkably improved, and the work of attaching the front end of the side member 12 to the lower surface of the vehicle body 15 with the improvement of the fixing accuracy of the round pipe 20 to the side member 12 is required. Not only becomes easier, but even if the side member 12 is bent up, down,
When 0 is attached, it is possible to reliably prevent the side member 12 from twisting and partially swaying, thereby preventing the occurrence of internal stress in the side member 12 and improving the degree of freedom in the arrangement of the side member 12. There are advantages that can be.

In the above embodiment, the bracket 2
1 holds the round pipe 20. As shown in FIG. 5, the round pipe 20 extending vertically in contact with the outer surface of the front end of each side member 12 is provided in the front-rear direction of the vehicle. Two sheet metal brackets 30, spaced apart from each other,
30, the outer peripheral surface is covered with
Even if 1 is welded to the outer peripheral surface of the side member 12 and the other end 32 of each bracket 30 is welded to the outer peripheral surface of the round pipe 20, the same operation and effect as in the above-described embodiment can be achieved. Also, in place of the round pipe side member in each of the above embodiments, the same as in each of the above embodiments can also be applied to a round pipe front cross member of a double-girder front chassis frame. It is also possible to fix the round pipe for attachment to the vehicle body, and furthermore, the round pipe for attachment to the vehicle body is fixed to the inner surface side of the chassis member in the double-girder front chassis frame. It goes without saying that the same operation and effect as those of the embodiments can be obtained.

[0016]

In the front chassis frame according to the first aspect of the present invention, a pipe for attachment to the vehicle body is welded to the side surface of the pipe-made chassis member of the crossbeam-shaped front chassis frame of the vehicle via a bracket. ,
By fixing the mounting pipe to the chassis member and directly regulating the relative relationship between the chassis member and the mounting pipe in advance without drilling the insertion hole of the mounting pipe in the chassis member, accurate and easy Since the mounting pipe can be fixed in position and direction, there is a great advantage that the productivity of the front chassis frame in which the mounting pipe is fixed to the chassis member can be remarkably improved.

Further, according to the method for manufacturing a front chassis frame according to the third aspect of the present invention, since the direction and the position of the mounting pipe fixed to the chassis member can be regulated correctly, the direction and the position can always be regulated. In addition, there is a feature that the accuracy can be easily adjusted and the productivity of the front chassis frame can be easily increased.

[Brief description of the drawings]

FIG. 1 is a schematic top view in an embodiment of the present invention.

FIG. 2 is an enlarged top view of a main part of the embodiment.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 2;

FIG. 4 is a vertical sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a top view of a main part according to another embodiment of the present invention.

FIG. 6 is a front view of a main part of a conventional device.

FIG. 7 is an enlarged longitudinal sectional view taken along the line VII-VII of FIG. 6;

FIG. 8 is a longitudinal sectional view of a main part of another conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Front chassis frame 11 Front cross member 12 Side member 13 Rear cross member 14 Connect bracket 15 Body 20 Round pipe 21 Bracket 23 Window 26 Bolt 30 Bracket

Continued on the front page (72) Inventor Harumichi Shiraishi 1410 Mohei, Kasaoka City, Okayama Prefecture Hirta Kogyo Co., Ltd. (72) Inventor Taikichi Akamatsu 1410 Mohei, Kasaoka City Okayama Prefecture Hilta Kogyo Co., Ltd. Hirta Kogyo Co., Ltd. (72) Inventor Junji Ishii 1410 Mohei, Kasaoka City, Okayama Prefecture Hirta Kogyo Co., Ltd. (72) Inventor Mitsunori Sanoda 1410 Mohei, Kasaoka City, Okayama Co., Ltd. References JP-A-5-270436 (JP, A) JP-A-8-164868 (JP, A) JP-A-9-86435 (JP, A) JP-A-8-169358 (JP, A) 5-19066 (JP, U) Japanese Utility Model Showa 59-6550 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62D 21/00 B62D 25/20 B62D 21/02

Claims (3)

(57) [Claims] In a double-girder front chassis frame of a vehicle, a pipe for attachment to a vehicle body extends up and down in contact with a side surface of a pipe-made chassis member, and a bracket that contacts an outer peripheral surface of the attachment pipe has an outer periphery of the chassis member. A front chassis frame welded to the surface and the outer peripheral surface of the mounting pipe. 2. The front chassis frame according to claim 1, wherein the mounting pipe and the chassis member are each formed of a round pipe. 3. A pipe for attachment to a vehicle body is brought into contact with a side surface of a pipe-made chassis member of a double-girder front chassis frame of a vehicle so that the attachment pipe extends vertically and an outer periphery of the attachment pipe. With the bracket abutting against the surface and the mounting pipe fixed to the setting position of the mounting pipe with respect to the chassis member, the outer peripheral surfaces of the bracket and the chassis member, and the outer circumferences of the bracket and the mounting pipe A method of manufacturing a front chassis frame that welds surfaces to each other.