JP5312291B2 - Divided frame structure and assembly method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a split frame structure minimizing a required clearance in joining respective frames and not generating distortion in assembling. <P>SOLUTION: In the frame structure split into plurality, joining parts 5a, 5b of respective frames include projected steps 6, 16, inclined exposed walls 7, 17 surrounding the steps 6, 16, and butting faces 8, 18 in the longitudinal direction and butting faces 9, 19 in both ends formed in the steps 6, 16. When both the joining parts 5a, 5b are joined with each other, a notch-like weld section 20 is formed in the outer periphery by overlapping of both the steps 6, 16 and opposing of both the exposed walls 7, 17 with each other. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a structure of a joint portion of a frame divided into a plurality of parts and an assembling method using the same.

As shown in FIG. 4A, the split frame of the motorcycle is joined by forming one joint 100 of the frame in a concave shape and forming the other joint 101 in a convex shape. As shown in FIG. 2, the convex joint 101 is inserted into the concave joint 100. For example, as shown in FIG. 4C, when assembling the divided head frame 102, left and right side frames 103, 104, and rear frame 105, the head frame 102 is first positioned and fixed to a jig, and then the head As shown by arrows, the joints 100 and 101 of the left and right side frames 103 and 104 are inserted into the joints 100 and 101 of the frame 102 from the rear, and then the joints 100 and 101 of the left and right side frames 103 and 104 are moved to the arrows. As shown by, the joints 100 and 101 of the rear frame 105 are inserted from the rear. The left and right side frames 103 and 104 and the rear frame 105 are clamped and positioned at each reference portion while being held by the rough guide.

The vehicle frame structure is a vehicle frame structure formed by connecting a plurality of closed cross-section members along the longitudinal direction, and is stretched along the longitudinal direction at a substantially central portion within the closed cross-section. A closed cross-section member having a middle wall portion and a step portion that is notched on one side so that the wall surface of the middle wall portion is exposed at the longitudinal end of the closed cross-section member is used. What connected so that the mutual wall surface exposed in the part may become surface joining is known (for example, refer patent document 1).

Furthermore, as a pipe joint structure for joining a pair of pipes by abutting these end faces, a joint member having a saddle type distal end portion inclined so that the base end side surface flows to the base end side when viewed from one direction. The base end is inserted into the joint end of one pipe, and the vertical tip is fixed to the one pipe so as to protrude into the other pipe, and the other pipe is joined to the joint end of the other pipe. It is known that the end face of both pipes are brought into close contact with each other by supporting a screw that advances and retracts toward the base end side surface of the joint member that has entered the pipe, and tightening the screw to the base end side surface. (For example, refer to Patent Document 2).

JP-A-5-58338 JP 2002-21226 A

  However, in the structure and the assembly method of the joint shown in FIG. 4, even if the parts can be inserted and the clamp positioning is established, the joint is in a state where interference stress is applied to the joint where the interference of the parts generated in each of the inserts is not known. Therefore, the entire frame is distorted, and the frame is deformed after provisional attachment. For this reason, forced fixing to the frame is required until the main attachment is completed. In addition, since a large clearance between the frames for insertion is required, a large variation occurs in the gap for welding at each joint, and the bead is not stable in automatic welding, and the weld is corrected by TIG welding. There is a problem that is necessary.

Further, in the invention described in Patent Document 1 and the invention described in Patent Document 2, a large clearance is required between the frames or the pipes at the time of joining. There is a problem that may occur.

  The present invention has been made in view of such problems of the prior art, and an object of the present invention is to minimize the clearance required for joining the frames and to assemble the frames. It is an object of the present invention to provide a divided frame structure and an assembling method thereof that do not sometimes cause distortion.

The invention according to claim 1 to solve the above-described problem is a frame structure divided into a plurality of frames, wherein the joint portion of each frame includes a protruding step portion, an inclined exposed wall portion surrounding the step portion, A longitudinal abutting surface formed at the stepped portion and abutting surfaces at both ends are provided, and when both the joint portions are joined, both the stepped portions overlap and both the exposed wall portions face each other. Thus, a cut-shaped weld is formed on the outer periphery.

The invention according to claim 2 is the assembling method by the divided frame structure according to claim 1, wherein the frame is positioned at the front and rear positioning reference positions, and the joints of these positioned frames are arranged. The joints of other frames are fitted from the lateral direction.

According to the first aspect of the present invention, the interference part of the frame at the time of assembly can be easily understood, and the quality control of the joint shape can be performed. Moreover, since the clearance gap between a junction part and a junction part can be made uniform, the quality of the welding part formed by both exposed wall parts opposing improves. In addition, since the quality of the welded portion is stabilized, the welding operation can be speeded up. Furthermore, since the quality of the welded portion is stabilized, all the welded portions can be performed by MIG welding, and correction work after welding is not necessary.

Further, according to the invention according to claim 2, because the frame is positioned at the front and rear positioning reference positions, and the joint portion of the other frame is fitted from the lateral direction to the joint portion of these positioned frames, Interference caused by assembly can be removed. Furthermore, since the frame is not deformed after the temporary attachment, no forced fixing work for the frame is required.

The exploded perspective view of the division frame structure concerning the present invention It is explanatory drawing of the junction part and joining state of each flame | frame, (a) is a side view of one junction part, (b) is a front view of one junction part, (c) is a side view of the other junction part, ( d) is a front view of the other joint, (e) is a side view of the joined state, and (f) is a sectional view of the joined state. It is explanatory drawing of the assembly method using the split frame structure which concerns on this invention, (a) is the set state of a head frame and a rear frame, (b) is the assembly state of the right and left side frames with respect to a head frame and a rear frame, ( c) Assembly completed state It is explanatory drawing of the conventional division | segmentation frame structure, (a) is a side view of a junction part, (b) is a side view of a joining state, (c) is a perspective view of the assembly method of a division | segmentation frame.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the divided frame structure according to the present invention is applied to a motorcycle and is composed of four frames: a head frame 1, left and right side frames 2 and 3, and a rear frame 4. Further, joint portions 5a and 5b for assembling the frames are provided at almost both ends of each of the frames 1, 2, 3 and 4.

As shown in FIGS. 2A and 2B, one joined portion 5 a to be joined is formed in the protruding step portion 6, the inclined exposed wall portion 7 surrounding the step portion 6, and the step portion 6. A longitudinal abutting surface 8 and abutting surfaces 9 and 9 at both ends are provided. Further, as shown in FIGS. 2C and 2D, the other joining portion 5 b to be joined also has a protruding step portion 16, an inclined exposed wall portion 17 surrounding the step portion 16, and a step portion 16. And abutting surfaces 19 and 19 at both ends.

One joining portion 5a and the other joining portion 5b are set so as to have a symmetrical positional relationship when joining, and the one joining portion 5a and the other joining portion 5b are shown in FIGS. 2 (e) and 2 (f). It becomes a joining state as shown in. Then, both the stepped portions 6 and 16 are overlapped with each other, and both the exposed wall portions 7 and 17 are opposed to each other, so that the cut-out welded portion 20 to which MIG welding is performed is the frame 1, 2, 3, 4. Formed at the seam of the spot.

  In the embodiment of the present invention, each of the frames 1, 2, 3 and 4 is provided with joints 5a and 5b at substantially both ends. However, as for the relationship of the joining part to be joined, one may be the joining part 5a shown in FIGS. 2 (a) and 2 (b) and the other should be the joining part 5b shown in FIGS. 2 (c) and 2 (d). The joints 5a and 5b are not necessarily provided in the frames 1, 2, 3, and 4.

  For example, the head frame 1 and the rear frame 4 can be provided with the same joint portion 5a, and the left and right side frames 2 and 3 can be provided with the same joint portion 5b. If it does so, as for the relationship of the junction part to join, one side becomes the junction part 5a shown to Fig.2 (a), (b), and the other becomes the junction part 5b shown in FIG.2 (c), (d).

  The operation of the divided frame structure according to the present invention configured as described above and the assembling method using the divided frame structure will be described. First, as shown in FIG. 3A, the head frame 1 and the rear frame 4 are set on jigs (not shown) provided with positioning reference positions 21 and 22, respectively. At this time, the relative positional relationship between the head frame 1 and the rear frame 4 is determined by the jig provided with the positioning reference positions 21 and 22.

  Next, as shown in FIG. 3 (b), the joint portions 5 a and 5 b of the left and right side frames 2 and 3 face the joint portions 5 a and 5 b of the head frame 1 and the joint portions 5 a and 5 b of the rear frame 4. Next, the postures of the left and right side frames 2 and 3 are adjusted. Then, the left and right side frames 2 and 3 are moved laterally toward the head frame 1 and the rear frame 4.

  Next, as shown in FIG. 3C, the joint 5 b of the left side frame 2 is fitted into the joint 5 a of the head frame 1, and the joint 5 a of the left side frame 2 is joined to the joint 5 b of the rear frame 4. Fit. Similarly, the joint 5b of the right side frame 3 is fitted into the joint 5a of the rear frame 4, and the joint 5a of the right side frame 3 is fitted into the joint 5b of the head frame 1.

Then, both the step portions 6 and 16 of the joint portion 5a and the joint portion 5b overlap each other, and both the exposed wall portions 7 and 17 face each other, so that the cut-shaped welded portion 20 becomes the frames 1, 2, 3, and 4. The four seams are formed. Then, MIG welding is performed on the four welds 20 to complete the assembling work using the divided frame structure.

  With such a structure of the joint portions 5a and 5b of the frames 1, 2, 3 and 4, the left and right side frames 2 and 3 can be fitted in the head frame 1 and the rear frame 4 from the lateral direction. Since it became possible, there is no need to increase the clearance between the frames.

Moreover, since the clearance gap between the junction part 5a and the junction part 5b can be made uniform, the quality of the welding part 20 in which both the exposed wall parts 7 and 17 oppose and improve is improved. In addition, since the quality of the welded portion 20 is stabilized, the speed of the welding operation can be increased. Furthermore, since the quality of the welded portion 20 is stabilized, all welding can be performed by MIG welding, and there is no need to perform correction work after welding.

According to the present invention, since the quality of the welded portion formed at the joint of the frame is stabilized, the speed of the welding operation can be increased, and all the welded portions can be performed by MIG welding, and correction work after welding is performed. It is possible to provide a divided frame structure and an assembling method thereof which are not necessary.

DESCRIPTION OF SYMBOLS 1 ... Head frame, 2 ... Left side frame, 3 ... Right side frame, 4 ... Rear frame, 5a, 5b ... Joining part, 6, 16 ... Step part, 7, 17 ... Exposed wall part, 8, 18 ... Abutting surfaces in the longitudinal direction, 9, 19 ... abutting surfaces at both ends, 20 ... welds, 21, 22 ... positioning reference positions.

Claims (2)

The frame structure is divided into a plurality of frames, each of which includes a protruding step portion, an inclined exposed wall portion surrounding the step portion, and a longitudinal abutting surface formed on the step portion. When both the joint portions are joined with the abutting surfaces at both ends, both the stepped portions overlap each other, and both the exposed wall portions face each other so that a cut-shaped welded portion is formed on the outer periphery. Feature split frame structure. 2. The assembling method using the divided frame structure according to claim 1, wherein the frames are positioned at the front and rear positioning reference positions, and the joint portions of the other frames are laterally arranged with respect to the joint portions of these positioned frames. A method for assembling a divided frame, characterized by fitting.

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