A fastening system for compensating tolerances

Abstract

The present invention provides a fastening structure for compensating tolerances, which has a simple structure and is convenient to operate. It can achieve quantitative adjustment between fittings and reduce assembly dimension errors. The fastening system is assembled between the mounting sheet metal and the workpiece to be fastened. The mounting bolt is sequentially screwed into the workpiece to be fastened, the fastening system, and the mounting sheet metal and then locked by a projection welding nut. The fastening system includes a limiting member, a mounting connecting member, and an adjusting member. The limiting member is limit-assembled on the workpiece to be fastened. The mounting connecting member is assembled on the limiting member. The adjusting member is threadedly connected to the mounting connecting member. A first clamping mechanism is provided inside the limiting member so that the limiting member, the first clamping mechanism, and the mounting bolt are clamped to each other. A second clamping mechanism is arranged inside the adjusting member so that the adjusting member, the second clamping mechanism, and the mounting bolt are clamped. A first stopper is provided on the outer wall of the mounting connecting member. A limiting structure is provided on the workpiece to be fastened, and the limiting mechanism leaves a movement allowance for the first stopper on the plane where the workpiece to be fastened is located.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts assembly, and particularly to a fastening structure for compensating tolerances. Background Technique

[0002] With the rapid development of the automotive industry, the assembly requirements for automotive hidden door handles, headlights and other parts that need to adjust the gap and surface difference during the assembly process are getting higher and higher. In order to ensure the aesthetic appearance of the sheet metal, for example, the current automotive hidden door handle installation sheet metal is fixed to the outer sheet metal by means of adhesive. However, during the assembly process, it is necessary to adjust the gap and surface difference between the parts. Such an assembly method is not easy to control and will result in relatively large assembly dimension errors between the parts. Summary of the Invention

[0003] In view of the above problems, the present invention provides a fastening structure for compensating tolerances, which has a simple structure and is easy to operate. It can achieve quantitative adjustment between parts and reduce assembly dimension errors.

[0004] Its technical solution is as follows: A fastening structure for compensating tolerances, which includes a fastening system. The fastening system is assembled between a mounting sheet metal and a workpiece to be fastened. An installation bolt is sequentially screwed into the workpiece to be fastened, the fastening system, and the mounting sheet metal and then locked by a projection welding nut. The feature is that: the fastening system includes a limiting member, a mounting connecting member, and an adjusting member. The limiting member is limit-assembled on the workpiece to be fastened. The mounting connecting member is assembled on the limiting member. The adjusting member is threadedly connected to the mounting connecting member. The installation bolt passes through the limiting member, the adjusting member, and the mounting sheet metal after passing through the workpiece to be fastened. A first clamping mechanism is provided in the limiting member so that the limiting member, the first clamping mechanism, and the installation bolt are clamped to each other. A second clamping mechanism is provided in the adjusting member so that the adjusting member, the second clamping mechanism, and the installation bolt are clamped to each other to meet the compensation for the movement of the installation bolt in the direction perpendicular to the workpiece to be fastened. A first stop block is provided on the outer wall of the mounting connecting member, and a limiting mechanism for limiting the first stop block is provided on the workpiece to be fastened, and the limiting mechanism leaves a movement margin for the first stop block on the plane where the workpiece to be fastened is located.

[0005] Its further features are as follows:

[0006] The first clamping mechanism adopts an elastic buckle for clamping the installation bolt;

[0007] The limiting member and the first clamping mechanism are of an integral structure. The elastic buckle is a hollow columnar structure. Symmetrical openings are circumferentially provided at the upper part of the elastic buckle. Elastic pieces are circumferentially arranged on the column wall of the elastic buckle. A buckle body is provided on the elastic piece. After the mounting bolt penetrates the workpiece to be fastened and extends into the elastic buckle, the mounting bolt presses against the buckle body and is clamped with the limiting member.

[0008] The limiting member includes an annular limiting seat. The limiting seat has a semi-circular connecting arm. A limiting protrusion is provided at the end of the semi-circular connecting arm. A limiting hole is opened on the workpiece to be fastened corresponding to the limiting protrusion. The limiting protrusion is inserted into the limiting hole.

[0009] An inverted U-shaped bracket is provided on the limiting seat. The mounting connecting piece is in the shape of a circular column. A corresponding first convex block is provided at the lower part of the outer wall of the mounting connecting piece corresponding to the bracket. When the mounting connecting piece is assembled on the limiting seat, it is limited by the cooperation of the bracket and the first convex block.

[0010] The limiting mechanism includes an inverted U-shaped limiting frame. The limiting frame is arranged on the workpiece to be fastened. After the mounting connecting piece is assembled on the limiting seat, the first stop block is located within the limiting frame and satisfies the movement allowance of the first stop block on the plane where the workpiece to be fastened is located.

[0011] The second clamping mechanism includes a cylindrical elastic piece. The elastic piece abuts against the top surface of the elastic buckle. The mounting bolt extends into the elastic piece, and through the elastic piece, the adjusting piece, the elastic piece, and the mounting bolt are clamped with each other.

[0012] A shrinkage opening is provided on the side of the elastic piece, and the middle part of the elastic piece is in a constricted shape.

[0013] The adjusting piece is in the shape of a circular column. The outer wall surface of the adjusting piece and the inner wall surface of the mounting connecting piece are both thread surfaces. A second convex block is provided on the outer edge of the top end of the adjusting piece. A second stop block is provided on the mounting connecting piece at the position of the second convex block. The second stop block is in the shape of an L. The height of the vertical part of the second stop block is not lower than the mounting height of the second convex block, so as to prevent the adjusting piece and the mounting connecting piece from being locked when the adjusting piece and the mounting connecting piece are installed.

[0014] A loosening prevention upright post is provided on the bracket. The top surface height of the loosening prevention upright post is higher than the mounting height of the second convex block, and it satisfies that when a certain external force is applied, the loosening prevention upright post deforms and the second convex block slides over the loosening prevention upright post.

[0015] The beneficial effects of the present invention are as follows: its structure is simple and the operation is convenient. By providing a second clamping mechanism inside the adjusting member, the adjusting member, the second clamping mechanism, and the mounting bolt are clamped to each other to compensate for the movement of the mounting bolt in the direction perpendicular to the workpiece to be fastened. The workpiece to be fastened is provided with a limiting mechanism for limiting the first stopper, and the limiting mechanism leaves a margin for the first stopper to move on the plane of the workpiece to be fastened. When assembling the mounting sheet metal and the workpiece to be fastened, it is convenient to achieve quantitative adjustment between the components, reduce the assembly dimension error, and is especially suitable for hidden door handles, headlights, etc. on automobiles, which require adjusting the gap and surface difference during the assembly process, and has good economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is a schematic three-dimensional assembly structure diagram of the present invention;

[0018] Figure 3 is a schematic front view assembly structure diagram of the present invention;

[0019] Figure 4 is Figure 3 the sectional structure diagram taken along the A-A direction in

[0020] Figure 5 is a schematic bottom view assembly structure diagram of the present invention;

[0021] Figure 6 is a schematic structural diagram of the mounting connector in the present invention;

[0022] Figure 7 is a schematic structural diagram of the limiting member in the present invention;

[0023] Figure 8 is a schematic structural diagram of the elastic sheet in the present invention;

[0024] Figure 9 is a schematic structural diagram of the adjusting member in the present invention;

[0025] Figure 10 is a schematic partial structure diagram of the assembly application of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] As Figures 1 to 9As shown in the figure, a fastening structure for compensating tolerances according to the present invention includes a fastening system 1, which is assembled between a mounting sheet metal 2 and a workpiece to be fastened 3. An installation bolt 4 is sequentially screwed into the workpiece to be fastened 3, the fastening system 1, and the mounting sheet metal 2, and then locked by a projection welding nut 5. The fastening system 1 includes a limiting member 6, a mounting connecting member 7, and an adjusting member 8. The limiting member 6 is limit-assembled on the workpiece to be fastened 3. The mounting connecting member 7 is assembled on the limiting member 6. The adjusting member 8 is threadedly connected to the mounting connecting member 7. The installation bolt 4 passes through the workpiece to be fastened 3 and then sequentially passes through the limiting member 6, the adjusting member 8, and the mounting sheet metal 2. A first clamping mechanism is provided in the limiting member 6, so that the limiting member 6, the first clamping mechanism, and the installation bolt 4 are clamped to each other. A second clamping mechanism is provided in the adjusting member 8, so that the adjusting member 8, the second clamping mechanism, and the installation bolt 4 are clamped to each other to compensate for the movement of the installation bolt 4 in the direction perpendicular to the workpiece to be fastened 3. A first stop block 9 is provided on the outer wall of the mounting connecting member 7, and a limiting mechanism for limiting the first stop block 9 is provided on the workpiece to be fastened 3, and the limiting mechanism leaves a movement margin for the first stop block 9 on the plane where the workpiece to be fastened 3 is located.

[0027] The first clamping mechanism adopts an elastic buckle 10 for clamping the installation bolt 4; the limiting member 6 and the first clamping mechanism are of an integral structure. The elastic buckle 10 is a hollow columnar structure. Symmetric openings 11 are circumferentially provided on the upper part of the elastic buckle 10. Elastic pieces 12 are circumferentially arranged on the column wall of the elastic buckle 10. A clamping body 13 is provided on the elastic piece 12. After the installation bolt 4 passes through the workpiece to be fastened 3 and extends into the elastic buckle 10, the installation bolt 4 presses against the clamping body 13 and is clamped to the limiting member 6.

[0028] The limiting member 6 includes an annular limiting seat 14. The limiting seat 14 has a semi-circular connecting arm 15. A limiting protrusion 16 is provided at the end of the semi-circular connecting arm 15. A limiting hole 17 is opened on the workpiece to be fastened 3 corresponding to the limiting protrusion 16. The limiting protrusion 16 is inserted into the limiting hole 17; due to the existence of the anti-loosening column 25 on the limiting member 6, the fastening system 1 is at the axis of the mounting hole of the workpiece to be fastened 3 (the fastening system is at the center of the mounting hole of the workpiece to be fastened), which is convenient for the installation bolt 4 to pass through the workpiece to be fastened 3 and extend into the fastening system 1.

[0029] An inverted U-shaped bracket 18 is provided on the limiting seat 14. The mounting connecting member 7 is in the shape of a circular column. A corresponding first convex block 19 is provided on the lower part of the outer wall of the mounting connecting member 7 corresponding to the bracket 18. When the mounting connecting member 7 is assembled on the limiting seat 14, it is limited by the cooperation of the bracket 18 and the first convex block 19;

[0030] The limiting mechanism includes an inverted U-shaped limiting frame 20. The limiting frame 20 is provided on the workpiece to be fastened 3. After the mounting connecting member 7 is assembled on the limiting seat 14, the first stop block 9 is located in the limiting frame 20, and the movement margin of the first stop block 9 on the plane where the workpiece to be fastened 3 is located is satisfied;

[0031] The second clamping mechanism includes an elastic sheet 21 in a cylindrical shape. The elastic sheet 21 is abutted against the top surface of the elastic buckle 10. The mounting bolt 4 extends into the elastic sheet 21, and through the elastic sheet 21, the adjusting member 8, the elastic sheet 21, and the mounting bolt 4 are clamped to each other. A shrinkage opening 22 is formed in the side portion of the elastic sheet 21, and the middle portion of the elastic sheet 21 is in a constricted shape.

[0032] The adjusting member 8 is in a circular column shape. The outer wall surface of the adjusting member 8 and the inner wall surface of the mounting connecting member 7 are both thread surfaces. A second convex block 23 is provided on the outer edge of the top end of the adjusting member 8. A second stop block 24 is provided on the mounting connecting member 7 at the position of the second convex block 23. The second stop block 24 is in an L shape, and the height of the vertical portion of the second stop block 24 is not lower than the mounting height of the second convex block 23, so as to prevent the adjusting member 8 and the mounting connecting member 7 from being locked when the adjusting member 8 and the mounting connecting member 7 are installed. Specifically, during the installation process of the adjusting member 8 and the mounting connecting member 7, the adjusting member 8 extends into the mounting connecting member 7, and the protruding height and the relative position in the thread of the second stop block 24 are located before the locking point of the adjusting member 8 and the mounting connecting member 7.

[0033] A loosening prevention upright post 25 is provided on the bracket 18. The top surface height of the loosening prevention upright post 25 is higher than the mounting height of the second convex block 23, and it is ensured that when a certain external force is applied, the loosening prevention upright post 25 deforms and the second convex block 23 slides past the loosening prevention upright post 25. Since the loosening prevention upright post 25 can block the adjusting member 8, the adjusting member 8 will not fall out of the fastening system 1 during transportation and other processes. Also, since the loosening prevention upright post 25 is very thin and can deform when a certain external force is applied, during the installation process of the workpiece 3 to be fastened, the adjusting member 8 can deform the loosening prevention upright post 25 on the limiting member 6, so as to slide past the loosening prevention upright post 25 on the limiting member 6.

[0034] During the installation of the present invention, a certain amount of adjustment can be achieved in the XZ plane and a certain amount of adjustment can be achieved in the Y direction. Among them, the XZ plane is the plane where the workpiece 3 to be fastened is located, and the Y-direction adjustment is the adjustment perpendicular to the workpiece 3 to be fastened.

[0035] Specifically, when the mounting bolt 4 is driven into the fastening system 1, it first contacts the limit piece 6. Since the limit piece 6 has an elastic buckle 10 to hold the mounting bolt 4, the mounting bolt 4 will drive the entire fastening system 1 to rotate together. When the first stop block 9 of the mounting connector 7 rotates to contact the upper limit frame 20 of the fastened workpiece 3, the mounting connector 7 is blocked and no longer rotates; since the limit protrusion 16 of the limit piece 6 is inserted in the limit hole 17, the limit piece 6 does not rotate either; at the same time, the elastic sheet 21 is tightly held by the mounting bolt 4 and the adjusting piece 8, so the rotation of the mounting bolt 4 drives the adjusting piece 8 to rotate and extend until the adjusting piece 8 contacts the mounting sheet metal, the adjusting piece 8 stops moving, the mounting bolt 4 and the elastic sheet 21 slip and clutch, and the mounting bolt 4 continues to rotate and extend to the projection welding nut 5 until the entire fastening structure is fastened; and because the semi-circular connecting arm 15 on the limiting member 6 is very thin and easy to deform, and because the first stop block 9 of the mounting connecting member 7 has a movable margin in the limiting frame 20 of the fastened workpiece 3, the dimensional error between the fastened workpiece 3 and the mounting sheet metal 2 in the XZ plane can be compensated; because the mounting bolt 4 will not extend into the projection welding nut 5 until the adjusting member 8 is against the mounting sheet metal 2, the dimensional error (face difference) between the fastened workpiece 3 and the mounting sheet metal 2 in the Y direction can be compensated; and before the fastened workpiece 3 and the fastening system 1 contact the mounting sheet metal 2, due to the presence of the anti-loosening column 25 on the limiting member 6, the fastening system 1 is at the axis of the mounting hole of the fastened workpiece 3, which facilitates the mounting bolt 4 to pass through the fastened workpiece 3 and extend into the fastening system 1.

[0036] Figure 10 In the present invention, the fastening system is applied to the hidden door handle assembly of the automobile. After the fastening system is limited on the fastened workpiece, the mounting bolt ( Figure 10 Not shown), until the adjustment member 8 abuts against the mounting sheet metal ( Figure 10 (not shown in the figure), thereby achieving the assembly requirements of spare parts for adjusting the gap and face difference of the hidden door handle of the automobile during the assembly process.

[0037] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0038] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in various embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fastening structure for compensating tolerance, which comprises a fastening system. The fastening system is assembled between a mounting sheet metal and a workpiece to be fastened. An installation bolt is sequentially screwed into the workpiece to be fastened, the fastening system, and the mounting sheet metal, and then locked by a projection welding nut. It is characterized in that: The fastening system includes a limiting member, a mounting connecting member, and an adjusting member. The limiting member is limit-assembled on the workpiece to be fastened. The mounting connecting member is assembled on the limiting member. The adjusting member is threadedly connected to the mounting connecting member. The mounting bolt passes through the workpiece to be fastened and then sequentially passes through the limiting member, the adjusting member, and the mounting sheet metal. A first clamping mechanism is provided in the limiting member, so that the limiting member, the first clamping mechanism, and the mounting bolt are clamped to each other. A second clamping mechanism is provided in the adjusting member, so that the adjusting member, the second clamping mechanism, and the mounting bolt are clamped to each other to compensate for the movement of the mounting bolt in the direction perpendicular to the workpiece to be fastened. A first stop block is provided on the outer wall of the mounting connecting member, and a limiting mechanism for limiting the first stop block is provided on the workpiece to be fastened, and the limiting mechanism leaves a movement allowance for the first stop block in the plane of the workpiece to be fastened; the first clamping mechanism adopts an elastic buckle for clamping the mounting bolt; the limiting member and the first clamping mechanism are of an integral structure, the elastic buckle is a hollow columnar structure, symmetric openings are circumferentially provided on the upper part of the elastic buckle, elastic pieces are circumferentially arranged on the column wall of the elastic buckle, a buckle body is provided on the elastic piece, after the mounting bolt passes through the workpiece to be fastened and extends into the elastic buckle, the mounting bolt presses against the buckle body and is clamped to the limiting member; the limiting member includes an annular limiting seat, the limiting seat has a semi-circular connecting arm, a limiting protrusion is provided at the end of the semi-circular connecting arm, a limiting hole is opened on the workpiece to be fastened corresponding to the limiting protrusion, and the limiting protrusion is inserted into the limiting hole; a bracket in an inverted U shape is provided on the limiting seat, the mounting connecting member is in a circular column shape, a corresponding first convex block is provided on the lower part of the outer wall of the mounting connecting member corresponding to the bracket, when the mounting connecting member is assembled on the limiting seat, it is limited by the cooperation of the bracket and the first convex block; the limiting mechanism includes a limiting frame in an inverted U shape, the limiting frame is provided on the workpiece to be fastened, after the mounting connecting member is assembled on the limiting seat, the first stop block is located in the limiting frame, and the movement allowance of the first stop block in the plane of the workpiece to be fastened is satisfied; the adjusting member is in a circular column shape, the outer wall surface of the adjusting member and the inner wall surface of the mounting connecting member are both thread surfaces, a second convex block is provided on the outer edge of the top end of the adjusting member, a second stop block is provided on the mounting connecting member at the position of the second convex block, the second stop block is in an L shape, and the height of the vertical part of the second stop block is not lower than the mounting height of the second convex block to prevent the adjusting member and the mounting connecting member from being locked when the adjusting member and the mounting connecting member are installed; an anti-loosening column is provided on the bracket, the top surface height of the anti-loosening column is higher than the mounting height of the second convex block, and it is satisfied that when a certain external force is applied, the anti-loosening column is deformed and the second convex block slides over the anti-loosening column.

2. The fastening structure for compensating tolerance according to claim 1, wherein: The second clamping mechanism includes an elastic sheet in a cylindrical shape. The elastic sheet abuts against the top surface of the elastic buckle, and the mounting bolt extends into the elastic sheet, so that the adjusting member, the elastic sheet and the mounting bolt are clamped to each other through the elastic sheet.

3. The fastening structure for compensating tolerance according to claim 2, characterized in that: A shrinkage opening is formed in the side portion of the elastic sheet, and the middle portion of the elastic sheet is in a constricted shape.

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