JPH09277961A - Deck cross member for automobile and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sufficient connecting force of a cross member by extending the diameter of the end of a small-diameter pipe, and pressfitting and inserting the end of a large-diameter pipe into the diameter-extended part of the small-diameter. pipe. SOLUTION: A large-diameter pipe 10 on steering column side (driver's seat side) and a small-diameter pipe 12 on anti-steering column side (assistant's seat side) are mutually connected in the middle to form a one pipe. In the connecting part, the diameter of the end of the small-diameter pipe 12 is extended, and the end part of the large-diameter pipe 10 is pressfitted and inserted into the diameter-extended part 12a of the small-diameter pipe 12. The diameter of the small-diameter pipe 12 can be easily extended by inserting a diameter extending jig molded so as to form a prescribed diameter-extended part 12a thereto from the end. In the connection, the small-diameter pipe 12 is preliminarily extended in diameter, the large-diameter pipe 10 is pressfitted and inserted into the diameter-extended part 12a, whereby the both are bonded and integrated together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile deck cross member and a manufacturing method thereof.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view of a driver's seat of an automobile, in which a steering column A and an instrument panel (hereinafter referred to as instrument panel) B are held,
A deck cross member (hereinafter referred to as a cross member) D is provided between both front pillars C to reinforce the body. The cross member D is composed of a metal pipe.

In this case, the driver's seat side is required to have higher rigidity than the passenger's seat side in order to hold the steering column. Therefore, the conventional cross member employs a pipe adapted to the rigidity of the steering column side.
However, this results in over-quality on the passenger side, which increases weight and material costs.

[0004]

For this reason, there are some pipes which have a small diameter and which are reinforced on the steering column side by covering the steering column side with an extended mounting bracket. However, according to this method, an additional mounting man-hour for covering the bracket is required.

A method in which two pipes are inserted into each other so that the driver seat side has a large diameter pipe and the passenger seat side has a small diameter pipe, and the large diameter pipe side is caulked into one pipe Has also been done. However, this caulking process is complicated,
High cost.

The present invention is intended to solve such a problem, and although two pipes are joined together, at low cost,
Moreover, it is possible to expose a cross member having a sufficient bonding force.

[0007]

SUMMARY OF THE INVENTION Under the above problems, the present invention is a deck cross member having a large diameter pipe on the steering column side and a small diameter pipe on the other side. Provided is a deck cross member for an automobile, which is characterized in that the end of a large diameter pipe is expanded and press-fitted into the expanded portion of a small diameter pipe for insertion.

In the present invention, as a method of manufacturing the above-mentioned cross member, a small-diameter pipe is previously expanded, and a large-diameter pipe is press-fitted and inserted into the expanded-diameter portion. A method for manufacturing a member, and a method for manufacturing a deck cross member for an automobile, characterized in that a small diameter pipe is inserted into a large diameter pipe in advance, and in this state, the small diameter pipe is expanded and pressed against the large diameter pipe.

Further, the present invention is a deck cross member in which the steering column side is a large diameter pipe and the other side is a small diameter pipe, and the middle is joined, and the end of the large diameter pipe is reduced and the end of the small diameter pipe is reduced. A deck cross member for an automobile, characterized by being press-fitted into a reduced diameter portion of a large diameter pipe and inserted therein.

Further, according to the present invention, as a method of manufacturing the above-mentioned cross member, a large diameter pipe is reduced in diameter in advance, and a small diameter pipe is press-fitted into the reduced diameter portion and inserted thereinto. Member manufacturing method: Reduce the diameter of the large diameter pipe in advance, insert the small diameter pipe into this reduced diameter portion until it passes through the reduced diameter portion, insert it, and expand the diameter of this passage portion and press it against the large diameter pipe. A method of manufacturing an automobile deck cross member is provided.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a rear view of a partial cross section of a cross member according to the present invention. In the present invention, the steering column side (driver's side) is a large diameter pipe 10 and the other side (passenger side) is a small diameter pipe. The pipe 12 is joined in the middle to form one pipe, but in this example, the joint is formed by expanding the end of the small-diameter pipe 12 to form the large-diameter pipe 10.
The end of is inserted into the enlarged diameter portion 12a of the small diameter pipe 12 by press fitting.

FIG. 2 is an explanatory view showing a method for expanding the diameter of the small-diameter pipe 12. To expand the diameter of the small-diameter pipe 12, the small-diameter pipe 12 is formed by forming a predetermined diameter-enlarged portion 12a from the end thereof. This can be easily done by inserting the expanded diameter jig 14.

As a joining method, the diameter of the small-diameter pipe 12 is expanded in advance, and the large-diameter pipe 10 is press-fitted into the expanded-diameter portion 12a and inserted. As a result, both are combined and integrated. At this time, the diameter expansion allowance, the press fit allowance, and the press force are set appropriately according to the diameter and the material.

FIG. 3 is an explanatory view showing another method of joining. In this method, first, the small diameter pipe 12 is connected to the large diameter pipe 1.
Then, the diameter-expanding jig 14 is inserted into the small-diameter pipe 12 to expand the diameter, and is brought into pressure contact with the large-diameter pipe 10 in this state. According to this method, there is an advantage that the press-fitting step can be omitted.

FIG. 4 is a side view of a partial cross-section of a cross member showing another example of the present invention. In this example, the end of the large diameter pipe 10 is reduced and the end of the small diameter pipe 12 is reduced. Is press-fitted into the reduced diameter portion 10a of the large diameter pipe 10 and inserted therein. At this time, the diameter reduction allowance and the like are set in the same manner as described above.

FIG. 5 is an explanatory view showing a method of reducing the diameter of the large-diameter pipe 10. Even when the diameter of the large-diameter pipe 10 is reduced, a predetermined reduced-diameter portion 10a is formed from the end thereof. This can be easily done by inserting the formed diameter reducing jig 16. As a joining method, the large diameter pipe 10 is reduced in diameter in advance, and the small diameter pipe 12 is press-fitted into the reduced diameter portion 10a and inserted.

FIG. 6 is an explanatory view showing another method of joining. In this method, the large diameter pipe 10 is reduced in diameter in advance, and the small diameter pipe 12 is passed through the reduced diameter portion 10a through the reduced diameter portion 10a. The passage portion 12b is expanded in diameter and pressed against the large-diameter pipe 10 while being press-fitted and inserted. According to this method, there are two pressure contact portions, and there is an advantage that the integration becomes stronger.

[0018]

As described above, according to the present invention, since different diameter pipes are joined by the above-described structure and method to form a cross member, even if partially required rigidity is different, It can be adapted. Also, joining
Easy and low cost.

[Brief description of drawings]

FIG. 1 is a rear view of an essential part of a cross-section of a cross member of an automobile showing an example of the present invention.

FIG. 2 is an explanatory diagram of a method of manufacturing a cross member of an automobile showing an example of the present invention.

FIG. 3 is an explanatory diagram of a method of manufacturing a cross member of an automobile showing an example of the present invention.

FIG. 4 is a partial rear cross-sectional rear view of a cross member of an automobile showing another example of the present invention.

FIG. 5 is an explanatory view of a method of manufacturing a cross member of an automobile showing another example of the present invention.

FIG. 6 is an explanatory view of a method of manufacturing a cross member of an automobile showing another example of the present invention.

FIG. 7 is a perspective view of a driver's seat portion of an automobile.

[Explanation of symbols]

 10 large diameter pipe 10a reduced diameter portion of large diameter pipe 12 small diameter pipe 12a enlarged diameter portion of small diameter pipe 12b passage portion of small diameter pipe

Claims (6)

[Claims] 1. A deck cross member having a large diameter pipe on the steering column side and a small diameter pipe on the other side, joined in the middle, the end of the small diameter pipe being expanded, and the end of the large diameter pipe expanding the small diameter pipe. An automatic verbal deck cross member characterized by being press-fitted and inserted in the diameter part. 2. A deck cross member having a large diameter pipe on the steering column side and a small diameter pipe on the other side, the ends of the large diameter pipe being reduced and the ends of the small diameter pipe being changed to the large diameter pipe. An automobile deck cross member characterized by being press-fitted into a reduced diameter portion and inserted therein. 3. A method of manufacturing a deck cross member according to claim 1, wherein a small diameter pipe is previously expanded, and the large diameter pipe is press-fitted and inserted into the expanded diameter portion. How to make a deck cross member. 4. The method for manufacturing a deck cross member according to claim 1, wherein the small-diameter pipe is preliminarily inserted in the large-diameter pipe, and in this state, the small-diameter pipe is expanded and brought into pressure contact with the large-diameter pipe. A method for producing a characteristic automobile deck cross member. 5. The method of manufacturing a deck cross member according to claim 2, wherein the large diameter pipe is reduced in diameter in advance, and the small diameter pipe is press-fitted into the reduced diameter portion and inserted. How to make a deck cross member. 6. The method for manufacturing a deck cross member according to claim 2, wherein the large diameter pipe is reduced in diameter in advance, and the small diameter pipe is press-fitted into the reduced diameter portion until it passes through the reduced diameter portion. At the same time, a diameter of this passage portion is expanded and brought into pressure contact with a large-diameter pipe, which is a method for manufacturing an automobile deck cross member.