Joining structure and joining method

Abstract

To provide a junction structure capable of increasing a welding length and enabling high-accuracy junction.SOLUTION: A mounting hole 8 having a notch 9 and a pair of mounting arm parts 10, 10 are formed so as to face each other in one end part 2b of one member 2 to be joined. An outermost diameter L1 of the mounting arm part 10 is made larger than an outermost diameter L2 of the other member 3 to be joined. A mutual distance L3 between the ends 2d, 2d of the pair of mounting arm parts 10, 10 is made smaller than the outermost diameter L2 of the other member 3 to be joined. A contact part between the one end part 2b of the one member 2 to be joined and a side surface of the other member 3 to be joined is joined by welding.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a joint structure. and joining method Regarding. [Background technology]

[0002] Conventionally, a monocoque type has been used for the structure of a vehicle body, but in recent years, the use of a space frame structure has been spreading in order to reduce the weight and increase the rigidity of vehicles. When manufacturing a vehicle body structure with a space frame structure, pipes of approximately the same diameter are assembled and joined together.

[0003] A known method for joining these pipes is to cut the end of one pipe to match the side of the other pipe to form a joint, and then join the joint between the one pipe and the other pipe by welding or the like (see Background Art, Figure 10 of Patent Document 1).

[0004] However, with this joining method, it may be difficult to achieve the required joint strength because the weld length is limited. As a solution to this problem, it has been proposed to increase the weld length and joint strength by flaring the end of one pipe to match the curved side of the other pipe (see Patent Document 1).

[0005] It has also been proposed to increase the joint strength by placing a bracket on the joint end of one of the pipes (see Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP2005-118794 [Patent Document 2] JP2002-120754A Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the joining method described in Patent Document 1 above, the welded portion shrinks due to thermal contraction after heat is input when welding the pipes together, which can cause the pipe to fall in the welding direction, making it difficult to achieve high positional accuracy.

[0008] Furthermore, the joining method described in Patent Document 2 requires a bracket in addition to the pipe, which causes problems such as increased weight and increased assembly man-hours.

[0009] Therefore, the present invention provides a joint structure that solves the above problems. and joining method The purpose of this invention is to provide the following: [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides a method for joining one end of one of the members to be joined. To , on the outer surface of the other member to be joined Embrace me A joining structure for joining, a joint portion is formed at one end of the one of the members to be joined, the joint portion has a mounting hole penetrating in a direction perpendicular to its axial direction and opening at the one end side, and a pair of mounting arms are provided opposite each other on the outside of the mounting hole, The shape of the inner portion (2c) of one end (2b) of the pair of mounting arms is formed into an arc shape or a tapered shape that increases in diameter from the one end toward the main body, and the mounting arms are opposed to each other while being spaced apart from each other, The outermost diameter of the joint in a direction perpendicular to the axial direction is larger than the outermost diameter of a cross section of the joint of the other member to be joined in a direction perpendicular to the axial direction, The distance between the ends of the pair of mounting arms is smaller than the outermost diameter of a cross section of the joint of the other member to be joined in a direction perpendicular to the axial direction, A part of the other member to be joined that does not include the maximum outer diameter in a direction perpendicular to the axis of the one member to be joined is not covered by the joint portion, when the joint portion is pressed against the other member to be joined, the ends of the mounting arms are elastically deformed so as to expand from each other, and the distance between the ends is shortened by a restoring force, so that the other pipe member is accommodated in the mounting hole, In this storage state This is a joint structure characterized in that the abutment portion between one end of one member to be joined and the side surface of the other member to be joined is joined by welding.

[0011] Also, A joining method in which one end of one member to be joined is embraced by the outer surface of the other member to be joined, a joint portion is formed at one end of the one of the members to be joined, the joint portion has a mounting hole penetrating in a direction perpendicular to its axial direction and opening at the one end side, and a pair of mounting arms are provided opposite each other on the outside of the mounting hole, The shape of the inner portion (2c) of one end (2b) of the pair of mounting arms is formed into an arc shape or a tapered shape that increases in diameter from the one end toward the main body, and the mounting arms are opposed to each other while being spaced apart from each other, The outermost diameter of the joint in a direction perpendicular to the axial direction is larger than the outermost diameter of a cross section of the joint of the other member to be joined in a direction perpendicular to the axial direction, The distance between the ends of the pair of mounting arms is smaller than the outermost diameter of a cross section of the joint of the other member to be joined in a direction perpendicular to the axial direction, A part of the other member to be joined that does not include the maximum outer diameter in a direction perpendicular to the axis of the one member to be joined is not covered by the joint portion, When the joint portion is pressed against the other member to be joined, the ends of the mounting arms are expanded from each other due to elastic deformation, and then the distance between the ends is reduced due to a restoring force, so that the other pipe member is housed in the mounting hole, Then, a contact portion between one end of one of the members to be joined and a side surface of the other member to be joined is joined by welding. You may do so. Effect of the Invention

[0012] In the present invention, a joint is formed at one end of one of the members to be joined, the joint having a mounting hole that penetrates in a direction perpendicular to the axial direction and opens at one end, and a pair of mounting arms are provided opposite the outside of the mounting hole, and the abutment portion of one end of one of the members to be joined with the outer surface of the other member to be joined is joined by welding at both axial ends of the other member to be joined, thereby making it possible to make the weld length longer than in the prior art described above, prevent collapse during welding, and achieve a highly precise joint. [Brief description of the drawings]

[0013] [Figure 1] 1 is a perspective view of a joint structure according to a first embodiment of the present invention; [Diagram 2] Front view of Figure 1. [Diagram 3] Side view of Figure 2. [Figure 4] FIG. 3 is a view from one end side of FIG. 2. [Diagram 5] FIG. 2 is a diagram for explaining a method for joining pipe members according to the first embodiment of the present invention. [Figure 6] FIG. 4 is a side view showing another example of the first embodiment of the present invention. [Figure 7] FIG. 4 is a view showing another example of the first embodiment of the present invention as viewed from one end side. [Figure 8] FIG. 11 is a side view showing an example of one of the pipe members used in the second embodiment of the present invention. [Figure 9] FIG. 11 is a side view showing another example of one of the pipe members used in the second embodiment of the present invention. [Figure 10] 10A, 10B, and 10C are diagrams showing one of the pipe members used in the third embodiment of the present invention, in which (a) is a top view, (b) is a front view, and (c) is a longitudinal sectional view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings.

[0015] [Example 1] FIG. 1 is a perspective view showing a joint structure 1 according to a first embodiment of the present invention, and the joint structure 1 is a joint structure in which one end of one member to be joined is joined to the outer surface of the other member to be joined.

[0016] The one member to be joined and the other member to be joined can be formed in any shape, such as a hollow tube or a solid shape, and in this embodiment, they are formed in a hollow tube shape. In the following, an example will be described in which one tubular member 2 is used as the one member to be joined and the other tubular member 3 is used as the other member to be joined.

[0017] The main body portion 2a of one of the pipe members 2 other than both ends is cylindrical with a circular cross-sectional shape, and the joint portion of the other pipe member 3 with the one of the pipe members 2 to be joined is cylindrical with a circular cross-sectional shape.

[0018] A joint 4 is provided on one end 2b of one of the pipe members 2. The joint 4 can be formed in any shape, either hollow or solid, and in this embodiment, it is formed in a hollow shape. The joint 4 may be formed integrally with the main body 2a, or may be formed of a separate member from the main body 2a and then joined to be integral with each other.

[0019] A body connecting portion 5 that changes the cross-sectional shape from a circle to a rectangle is formed on the body 2a side of the joint 4, as shown in Figures 1 to 3. The pipe connecting portion 6 provided on one end 2d of the body connecting portion 5 has a rectangle cross-sectional shape as shown in Figures 1 to 3, and is expanded so that its outermost diameter in the direction perpendicular to the axis XX direction of the body 2a is larger than the outer diameter of the body 2a.

[0020] The pipe connecting portion 6 has an attachment hole 8 formed therethrough in a direction perpendicular to the axis XX direction of the main body 2a, and a notch 9 is formed on one end 2d side of the pipe connecting portion 6, and the one end 2d side of the attachment hole 8 is open.

[0021] A pair of mounting arms 10, 10 are formed at positions facing each other on the radial outside of the mounting hole 8, and a notch 9 is formed between one ends 2b, 2b of the pair of mounting arms 10, 10, so that the one ends 2b, 2b of the pair of mounting arms 10, 10 face each other at a distance. Both mounting arms 10, 10 are formed to have elasticity in the direction in which the mounting arms 10, 10 approach and move away from each other.

[0022] One end 2b of the mounting arm 10, 10 is formed so that its end face is closed, as shown in Figures 3 and 4. It is preferable to form the shape of the inner part 2c on the one end 2b side of the mounting arm 10, 10 in an arc shape or a tapered shape that increases in diameter from the one end 2d side toward the main body 2a side, and in this embodiment it is formed in an arc shape.

[0023] The inner peripheral shape of the mounting hole 8 is formed to be the same as a part of the outer peripheral shape of the other tubular member 3. As shown in Fig. 1 to Fig. 3, in a state in which the one tubular member 2 and the other tubular member 3 are joined, a portion of the other tubular member 3 on one end 2d side that does not include the maximum outer diameter in a direction perpendicular to the axis XX direction of the one tubular member 2 is not covered by the joint portion 4 and is exposed to the outside.

[0024] When one pipe member 2 and the other pipe member 3 are joined, one end side of the other pipe member 3 may be located at approximately the same position as one end 2d of the mounting arm 10 as shown in FIG. 3, or may protrude outward from one end 2d of the mounting arm 10 as shown in FIG. 6, or may be located closer to the main body portion 2a than one end 2d of the mounting arm 10 (not shown).

[0025] The outermost diameter L1 of the joint 4 in the direction perpendicular to the axis XX is set larger than the outermost diameter L2 of the mounting hole 8, i.e., the cross section in the direction perpendicular to the axis YY at the joint of one of the tubular members 2, by an amount sufficient for the pair of mounting arms 10, 10 to ensure a predetermined rigidity, etc. In addition, the distance L3 between the insides of the one ends 2d, 2d of the pair of mounting arms 10, 10 is set smaller than the outermost diameter L2 of the cross section in the direction perpendicular to the axis YY at the joint of one of the tubular members 2.

[0026] Next, a method for joining one tubular member 2 and the other tubular member 3 will be described.

[0027] First, as shown in FIG. 5(a), one end 2d of one tubular member 2 is arranged to face the other tubular member 3.

[0028] Next, when one ends 2d, 2d of the pair of mounting arms 10, 10 are pressed against the outer surface of the other pipe member 3, as shown in Fig. 5(b), the one ends 2d, 2d of the mounting arms 10, 10 are pushed apart by their elasticity, and are deformed so as to widen the space between the one ends 2d, 2d of the mounting arms 10, 10. At this time, by forming the inside of the one ends 2d, 2d of the mounting arms 10, 10 into an arc shape or a tapered shape that expands in diameter from the one end 2d side toward the main body 2a side, it is possible to prevent the one end 2d from biting into the side surface of the other pipe member 3, reduce frictional resistance during joining, and improve workability during assembly.

[0029] Furthermore, when one of the pipe members 2 is moved toward the other pipe member 3, as shown in Figure 5(b), after one end 2d of the mounting arm 10 overcomes the maximum outer diameter of the one of the pipe members 2 in a direction perpendicular to the axis XX direction, the distance between the one ends 2d, 2d of the mounting arms 10, 10 gradually decreases due to the restoring force of the mounting arms 10, 10.

[0030] Thereafter, as shown in FIG. 5(c), the other pipe member 3 is stored in the mounting hole 8 so that the outer surface of the other pipe member 3 is embraced by the inner surfaces of the mounting hole 8 of the pair of mounting arms 10, 10.

[0031] Next, both ends of the abutment portion between one end 2b of one tube member 2 and the side surface of the other tube member 3 in the axis YY direction of the other tube member 3 are welded by welding W1 around the entire circumference of the abutment portion to join one tube member 2 and the other tube member 3. Welding may be performed on one side at a time, or both ends may be performed simultaneously. By welding both ends simultaneously, product precision can be improved.

[0032] Also, in the direction of the axis YY of the other tube member 3, the portions of the mounting arms 10, 10 protruding from the other tube member 3 toward the one end 2d and inside the abutting portion between the one tube member 2 and the other tube member 3 may be welded by welding W2 to join the one tube member 2 and the other tube member 3. By performing this welding W2, the joining strength can be further increased, and the product precision can be further improved.

[0033] In addition, when pressing one end 2d, 2d of the pair of mounting arms 10, 10 against the outer surface of the other pipe member 3, the other pipe member 3 can be crushed within the range of elastic deformation at a position that does not interfere with the mutual joint, thereby reducing the amount of deformation of one end of the mounting arms 10, 10 and making it easier to assemble one pipe member 2 and the other pipe member 3.

[0034] The present invention, by virtue of having the above-mentioned structure and configuration, provides the following actions and effects.

[0035] By storing the other tube member 3 inside the mounting hole 8 formed by a pair of mounting arms 10, 10 so that the inner surface of the mounting hole 8 embraces the outer surface of the other tube member 3, the circumferential length of the abutting portion between the one tube member 2 and the other tube member 3 can be made longer than in the above-mentioned conventional technology, thereby making it possible to increase the weld length and increase the joint strength.

[0036] Furthermore, since the present invention does not require auxiliary members such as brackets as in the joining method described in Patent Document 2, it is possible to reduce costs by making the product lighter than the one described in Patent Document 2 and by reducing the number of assembly steps.

[0037] In addition, the outer surface of the other tube member 3 is embraced by the inner surface of the mounting hole 8 of the pair of mounting arms 10, 10, and both ends of the abutment portion between one end 2b of one tube member 2 and the side surface of the other tube member 3 in the axial direction YY of the other tube member 3 are welded, thereby preventing collapse during welding and achieving a highly precise joint.

[0038] In addition, since the structure is such that the inner surface of the mounting hole 8 of the pair of mounting arms 10, 10 embraces the outer surface of the other pipe member 3 when the first pipe member 2 and the second pipe member 3 are assembled, the pipe members 2, 3 can be temporarily fixed even before being joined by welding, making a temporary fixing jig unnecessary. Furthermore, since the positions of the first pipe member 2 and the second pipe member 3 can be easily fine-tuned relative to each other before being joined by welding, a highly accurate joint can be achieved.

[0039] In the above embodiment 1, the cross-sectional shape of the main body 2a other than both ends of one pipe member 2 is circular, and the cross-sectional shape of the other pipe member 3 at the joint with one pipe member 2 is circular, but each cross-sectional shape can be formed into any shape such as circle, ellipse, polygonal shape such as rectangle or hexagon, and the cross-sectional shapes of one pipe member 2 and the other pipe member 3 may be the same or similar shapes, or different shapes. The inner peripheral shape of the mounting hole 8 is formed to be the same as part of the outer peripheral shape of the joint with the other pipe member 3.

[0040] Furthermore, the length, shape and structure of the main body 2a of one tubular member 2 and the other tubular member 3 can be set to any length, shape and structure other than those shown in the figure.

[0041] Moreover, in the above-mentioned Example 1, the cross-sectional shape of the pipe connecting part 6 is a rectangle, but it can be formed into any shape such as a circle, an ellipse, or a polygon such as a rectangle or hexagon, and the cross-sectional shape of the main body connecting part 5 is formed according to the cross-sectional shapes of the main body 2a and the pipe connecting part 6. Moreover, in the above-mentioned Example 1, the shape of the one end 2d is a rectangle, but it may be formed into a part of a circle, a part of an ellipse, a part of a polygon, or other shapes depending on the direction of the required strength, as shown in Fig. 7.

[0042] [Example 2] In the above-mentioned Example 1, a main body connecting portion 5 is formed at the joint 4, and the outermost diameter in the direction perpendicular to the axis XX direction, which changes the cross-sectional shape from circular to rectangular, is gradually increased from the main body portion 2a side toward the one end 2d side, and the cross-sectional shape of the pipe connecting portion 6 is made rectangular. However, the shapes of the main body connecting portion 5 and the pipe connecting portion 6 can be formed arbitrarily depending on the shapes of the main body portion 2a of one pipe member 2 and the other pipe member 3, etc.

[0043] The cross-sectional shape of the main body 2a and the cross-sectional shape of the pipe connecting portion 6 may be the same or similar, or may be different.

[0044] For example, as shown in FIG. 8, the main body portion 2a, the main body connecting portion 5, and the pipe connecting portion 6 of one of the pipe members 2 may all be constructed from circular pipes of the same diameter, and a mounting hole 8 may be formed through one end portion 2b in a direction perpendicular to the axis XX to form mounting arms 10, 10.

[0045] In addition, the main body portion 2a, the main body connecting portion 5 and the pipe connecting portion 6 of one of the pipe members 2 may all be constructed of circular pipes, and may be gradually tapered in diameter at the main body connecting portion 5 as shown in Figure 9, or may be expanded in diameter (not shown).

[0046] The rest of the structure is the same as in the first embodiment, so a description thereof will be omitted.

[0047] The second embodiment also provides the same effects as the first embodiment.

[0048] [Example 3] In this embodiment 3, as shown in FIG. 10, the main body connecting portion 5 and the pipe connecting portion 6 are all made of circular pipes, the mounting holes 8 are formed through them in a direction perpendicular to the axis XX, and a rib 11 is formed on the outer surface of the mounting arm portion 10 to increase rigidity.

[0049] The rest of the structure is similar to that of the first and second embodiments, so a description thereof will be omitted.

[0050] The third embodiment also provides the same effects as the first and second embodiments.

[0051] In this embodiment 3, by forming a rib 11 on the outer surface of the mounting arm 10, plastic deformation near one end 2d of the mounting arm 10 is suppressed when assembling one pipe member 2 and the other pipe member 3, and the abutment between the mounting arm 10 and the other pipe member 3 is more reliable, thereby improving the accuracy of the joining. [Explanation of symbols]

[0052] 1. Pipe component joint structure 2. One of the pipe members (one of the members to be joined) 2b One end 3 The other pipe member (the other member to be joined) 4 Joint 8 Mounting holes 9. Cutout 10 Mounting arm

Claims

1. A joining structure in which one end of one member to be joined is embraced and joined to the outer surface of the other member to be joined, a joint portion is formed at one end of the one of the members to be joined, the joint portion has a mounting hole penetrating in a direction perpendicular to its axial direction and opening at the one end side, and a pair of mounting arms are provided opposite each other on the outside of the mounting hole, The shape of the inner portion (2c) of one end (2b) of the pair of mounting arms is formed into an arc shape or a tapered shape that increases in diameter from the one end toward the main body, and the mounting arms are opposed to each other while being spaced apart from each other, The outermost diameter of the joint in a direction perpendicular to the axial direction is larger than the outermost diameter of a cross section of the joint of the other member to be joined in a direction perpendicular to the axial direction, The distance between the ends of the pair of mounting arms is smaller than the outermost diameter of a cross section of the joint of the other member to be joined in a direction perpendicular to the axial direction, A part of the other member to be joined that does not include the maximum outer diameter in a direction perpendicular to the axis of the one member to be joined is not covered by the joint portion, when the joint portion is pressed against the other member to be joined, the ends of the mounting arms are elastically deformed so as to spread apart from each other, and the distance between the ends is shortened by a restoring force, so that the other pipe member is housed in the mounting hole, This joint structure is characterized in that in this stored state, the abutting portion between one end of one of the members to be joined and the side surface of the other member to be joined is joined by welding.

2. A joining method in which one end of one member to be joined is embraced by the outer surface of the other member to be joined, a joint portion is formed at one end of the one of the members to be joined, the joint portion has a mounting hole penetrating in a direction perpendicular to its axial direction and opening at the one end side, and a pair of mounting arms are provided opposite each other on the outside of the mounting hole, The shape of the inner portion (2c) of one end (2b) of the pair of mounting arms is formed into an arc shape or a tapered shape that increases in diameter from the one end toward the main body, and the mounting arms are opposed to each other while being spaced apart from each other, The outermost diameter of the joint in a direction perpendicular to the axial direction is larger than the outermost diameter of a cross section of the joint of the other member to be joined in a direction perpendicular to the axial direction, The distance between the ends of the pair of mounting arms is smaller than the outermost diameter of a cross section of the joint of the other member to be joined in a direction perpendicular to the axial direction, A part of the other member to be joined that does not include the maximum outer diameter in a direction perpendicular to the axis of the one member to be joined is not covered by the joint portion, When the joint portion is pressed against the other member to be joined, the ends of the mounting arms are expanded from each other due to elastic deformation, and then the distance between the ends is reduced due to a restoring force, so that the other pipe member is housed in the mounting hole, Thereafter, a contact portion between one end of one of the members to be joined and a side surface of the other member to be joined is joined by welding.

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