Frame and rear fork connecting structure

Abstract

The utility model discloses a frame and rear fork connecting structure which comprises a frame body, a plurality of first through holes are formed in the frame body, and expansion linings with first conical surfaces are arranged in the first through holes. A plurality of second through holes are formed in the rear fork main body, and connecting sleeves are assembled at the second through holes; the positioning shaft is arranged at the expansion bushing in a penetrating manner, the outer end of the positioning shaft is assembled on the mounting part, the positioning shaft comprises a second conical surface matched with the first conical surface, and in the locking process of the positioning shaft, the expansion bushing is driven to move towards the direction of the rear fork main body, so that the expansion bushing and the mounting part are jointly matched to limit the rear fork main body. Through the conical surface matching of the expansion bushing and the positioning shaft, the connection between the rear fork and the frame is firmer and more reliable, so that the connection stability is greatly improved, meanwhile, under the matching of the expansion bushing and the locking piece, the positioning shaft is locked, the tolerance gap between the rear fork and the frame is automatically matched, and the connection of the positioning shaft, the frame and the rear fork is quickly completed.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a connection structure between a frame and a rear fork. Background Art

[0002] The connection between the frame and rear fork is a crucial component of the structure of two-wheeled or four-wheeled vehicles, such as motorcycles, bicycles, and all-terrain vehicles (ATVs). This connection is crucial to the vehicle's handling, stability, and safety. Existing technology typically uses bolts and nuts to secure the rear fork to the frame. This can easily lead to stress and deformation in the frame or rear fork, and can also cause an unstable connection between the rear fork and frame. Utility Model Content

[0003] The utility model aims to solve the deficiencies in the prior art and provides a connection structure between a bicycle frame and a rear fork.

[0004] In order to solve the above technical problems, the present invention solves them through the following technical solutions: a frame and rear fork connection structure includes a frame body, a plurality of first through holes are opened on the frame body, and an expansion bushing with a first conical surface is arranged in the first through holes; a rear fork body, a plurality of second through holes are opened on the rear fork body, and a connecting sleeve is installed at the second through holes; and a positioning shaft, the positioning shaft is passed through the expansion bushing and its outer end is installed on the mounting member, the positioning shaft includes a second conical surface matching the first conical surface, and during the locking process of the positioning shaft, the expansion bushing is driven to move toward the rear fork body, so that the expansion bushing and the mounting member cooperate to limit the rear fork body.

[0005] In the above solution, preferably, the positioning shaft includes a driving head, one end of the second conical surface is connected to the positioning shaft body, and the other end is obliquely extended to be connected to the driving head.

[0006] In the above solution, preferably, when the second conical surface moves toward the first conical surface, the positioning shaft opens the expansion bushing, and the positioning shaft and the expansion bushing are interference-fitted to lock the positioning shaft and the frame.

[0007] In the above solution, preferably, the connecting sleeve includes a first locking sleeve and a second locking sleeve that are symmetrically arranged, and the locking sleeve includes a contact ring with a diameter larger than the locking sleeve body, and the contact ring of the first locking sleeve is located on one side of the expansion sleeve.

[0008] In the above solution, preferably, a motor housing is provided on the frame body, the mounting member is provided in the motor housing, and a threaded mounting hole is provided in the mounting member.

[0009] In the above solution, preferably, the motor housing is provided with a mounting groove for assembling a mounting member, and the mounting member is located on one side of the connecting sleeve.

[0010] In the above solution, preferably, the positioning shaft includes a smooth rod and a threaded rod, and the threaded rod is used to cooperate with the mounting piece.

[0011] In the above solution, preferably, the expansion bushing includes a hollow area.

[0012] In the above solution, preferably, the second through hole includes a connecting ring, and the connecting sleeve is arranged inside the connecting ring.

[0013] In the above solution, preferably, the frame body further includes symmetrically arranged mounting frames, each of which is provided with a first through hole.

[0014] The beneficial effects of this utility model are as follows: the tapered surfaces of the expansion bushing and the locating shaft cooperate to make the connection between the rear fork and the frame more secure and reliable, thereby greatly improving the stability of the connection. At the same time, the expansion bushing and the locking member cooperate to lock the locating shaft, automatically matching the tolerance gap between the rear fork and the frame, and quickly completing the connection between the locating shaft, frame, and rear fork. The interference fit of the expansion bushing effectively disperses stress at the connection site, reduces local stress concentration, and extends the service life of the connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall connection of the utility model.

[0016] Figure 2 It is a side view of the utility model.

[0017] Figure 3 for Figure 2 AA section view.

[0018] Figure 4 for Figure 3 Enlarged view of point B.

[0019] Figure 5 It is the overall exploded view of the utility model.

[0020] Figure 6 This is a schematic diagram of the connection relationship in the through hole of the utility model.

[0021] Figure 7 This is a schematic diagram of the internal connection relationship in the through hole of the utility model. DETAILED DESCRIPTION

[0022] The present invention is described in further detail below with reference to the accompanying drawings and specific embodiments: Figure 1-Figure 7A frame and rear fork connection structure includes a frame body 1 and a rear fork body 4, wherein the frame body 1 includes a symmetrically arranged mounting frame 20, and the mounting frame 20 extends out of the frame body 1 to form a space therebetween, and the space can be used to install the rear fork body 4.

[0023] A plurality of first barrels are mounted on the frame body. Specifically, a first through hole 2 is provided on each of the mounting frames 20. An expansion bushing 3 is provided in the first through hole 2. The expansion bushing 3 has a circular cross-section and a hollow area 19 is provided on the expansion bushing 3. The hollow area 19 is used to facilitate the expansion and reset of the expansion bushing 3. An oblique first conical surface 8 is provided inside the expansion bushing 3.

[0024] A second through hole 5 is provided on the rear fork body 4. When the second through hole 5 is opposite to the first through hole 2, installation can be achieved. A connecting sleeve 6 is provided in the second through hole 5. The connecting sleeve 6 includes a first locking sleeve 11 and a second locking sleeve 12 symmetrically arranged. Both locking sleeves include a contact ring 13 with a diameter larger than that of the main body. The contact ring 13 of the first locking sleeve 11 cooperates with the expansion sleeve 3.

[0025] In order to achieve the fixation of the frame and the rear fork, a positioning shaft 7 is provided, and the positioning shaft 7 includes a second conical surface 9. Specifically, the positioning shaft 7 includes a driving head 10, and the driving head 10 has a polygonal shape. In this embodiment, the driving head 10 is hexagonal, and a spline groove is provided inside the driving head 10. The positioning shaft 7 can be driven by an adaptive tool, and the transmission positioning shaft 7 can be realized in the outer shape or inside of the driving head 10.

[0026] At the same time, one end of the second conical surface 9 is connected to the main body of the positioning shaft 7, and the other end is obliquely extended to be connected to the driving head 10. The diameter of the connecting part of the second conical surface 9 and the main body of the positioning shaft 7 is equivalent. At the same time, the diameter of the driving head 10 is larger than the main body of the positioning shaft 7, thereby forming the second conical surface 9, and the second conical surface 9 can cooperate with the first conical surface 8.

[0027] Specifically, the positioning shaft 7 passes through the first through hole 2 of the frame and the second through hole 5 of the rear fork, wherein the second conical surface 9 of the expansion bushing 3 contacts the first conical surface 8. As the expansion bushing 3 is continuously expanded, an interference fit is formed between the connecting rod and the frame, thereby locking the two. At the same time, the expansion bushing 3 continuously enters and cooperates with the connecting sleeve 6, that is, the expansion bushing 3 and the first locking sleeve 11 reduce the gap between the two groups, and then the rear fork is locked by the connecting sleeve 6, that is, the positioning shaft 7 locks the frame and the rear fork at the same time.

[0028] Since there needs to be a component at the end of the positioning shaft 7 to cooperate with the continuous deepening of the positioning shaft 7, a threaded rod 17 and a smooth rod 18 are provided on the main body of the positioning shaft 7, which are the driving head 10, the second cone surface 9, the smooth rod 18, and the threaded rod 17 in order. In the embodiment, a motor is provided between the frame body 1, wherein a mounting groove 15 is provided on the motor housing 14, and a mounting part 16 is fixedly provided in the mounting groove 15. The mounting part 16 has a threaded mounting hole and can be provided corresponding to the threaded rod 17. When the positioning shaft 7 passes through the expansion bushing 3 and the connecting sleeve 6 is threadedly connected to the mounting part 16, a fixed connection between the three can be formed.

[0029] Further explanation, the mounting member 16 can be a separate component, that is, in this embodiment, the mounting member 16 can be a separate component, or it can be one of the parts on a component, which can be an independent part or a part integrally formed on the component, such as a threaded mounting hole formed on the motor housing 14.

[0030] Furthermore, the end of the positioning shaft 7 can be fitted with a separate component such as a screw sleeve, a nut, or other component having a threaded mounting hole that needs to be mounted there. Furthermore, the positioning shaft 7 and the components connected thereto do not necessarily require threads, and can be fastened with rivets, or a latch can achieve a positioning effect equivalent to threads.

[0031] Moreover, the second locking groove is located on one side of the mounting groove 15, and the contact ring 13 of the second locking groove abuts against the mounting member 16. When the positioning shaft 7 moves deeper, the second locking groove cooperates with the first locking groove to achieve a more stable connection relationship for the rear fork body 4.

[0032] A connecting ring 21 is provided in the second through hole 5 , and the connecting ring 21 is located between the second through hole 5 and the connecting sleeve 6 , so as to facilitate the rear fork in the unlocking direction to adjust its position relative to the frame.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A frame and rear fork connection structure, characterized by: include A vehicle frame body (1), wherein a plurality of first through holes (2) are formed on the vehicle frame body (1), and expansion bushings (3) having first conical surfaces (8) are arranged in the first through holes (2); A rear fork body (4), wherein a plurality of second through holes (5) are formed on the rear fork body (4), and a connecting sleeve (6) is mounted on the second through holes (5); and A positioning shaft (7), wherein the positioning shaft (7) is passed through the expansion bushing (3) and the outer end of the positioning shaft (7) is assembled on the mounting member (16). The positioning shaft (7) includes a second conical surface (9) that matches the first conical surface (8). During the locking process of the positioning shaft (7), the expansion bushing (3) is driven to move toward the rear fork body (4), so that the expansion bushing (3) and the mounting member (16) cooperate to limit the rear fork body (4).

2. The frame and rear fork connection structure according to claim 1, characterized in that: The positioning shaft (7) includes a driving head (10); one end of the second conical surface (9) is connected to the main body of the positioning shaft (7); and the other end is obliquely extended to be connected to the driving head (10).

3. A frame and rear fork connection structure according to claim 1 or 2, characterized in that: When the second conical surface (9) moves toward the first conical surface (8), the positioning shaft (7) opens the expansion bushing (3), and the positioning shaft (7) and the expansion bushing (3) are interference-fitted to lock the positioning shaft (7) and the vehicle frame.

4. The frame and rear fork connection structure according to claim 1, characterized in that: The connecting sleeve (6) comprises a first locking sleeve (11) and a second locking sleeve (12) which are symmetrically arranged. The locking sleeve comprises a contact ring (13) having a diameter larger than that of the locking sleeve body. The contact ring (13) of the first locking sleeve (11) is located on one side of the expansion sleeve (3).

5. The frame and rear fork connection structure according to claim 1, characterized in that: A motor housing (14) is provided on the vehicle frame body (1), the mounting member (16) is provided in the motor housing, and a threaded mounting hole is provided in the mounting member (16).

6. The frame and rear fork connection structure according to claim 5, characterized in that: The motor housing (14) is provided with a mounting groove (15) for assembling a mounting member, and the mounting member (16) is located on one side of the connecting sleeve (6).

7. The frame and rear fork connection structure according to claim 1 or 5, characterized in that: The positioning shaft (7) comprises a polished rod (18) and a threaded rod (17), and the threaded rod (17) is used to cooperate with the mounting piece (16).

8. The frame and rear fork connection structure according to claim 3, characterized in that: The expansion bushing (3) includes a hollow area (19).

9. The frame and rear fork connection structure according to claim 1, characterized in that: The second through hole (5) includes a connecting ring (21), and the connecting sleeve (6) is arranged inside the connecting ring (21).

10. The frame and rear fork connection structure according to claim 1, characterized in that: The frame body (1) further comprises symmetrically arranged mounting frames (20), each of which is provided with a first through hole (2).

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