Positioning pipe of front shock absorber of motorcycle

Abstract

The utility model discloses a positioning pipe of a front shock absorber of a motorcycle, and relates to the technical field of accessories of shock absorbers of motorcycles. The device specifically comprises a pipe body and an insert fixed in the pipe body in an embedded mode, the insert is provided with a through cavity formed in the length center line direction of the pipe body, the through cavity is of a cavity structure with one large end and one small end, and the large end of the through cavity is arranged close to the shock absorber front fork pipe. On the premise that the overall structure of the positioning pipe is not changed, the damping size of the shock absorber can be adjusted through the additionally-arranged insert, and therefore the whole positioning pipe can be continuously and stably used in the shock absorber.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle shock absorber accessories, in particular to a positioning tube of a motorcycle front shock absorber. Background Art

[0002] The positioning tube, also known as the piston tube, is a component of the motorcycle front shock absorber. The structure of the existing front shock absorber is as follows Figure 1 As shown, the front shock absorber mainly includes a cylinder 103, a piston tube 101 arranged in the cylinder 103, and a front fork tube 102 sleeved outside the piston tube 101. The mutual cooperation of the various fluid chambers formed in the piston tube 101, the front fork tube 102, and the cylinder 103 and the spring ensures that when the front fork tube moves downward relative to the cylinder (compression movement), the direction of the fluid flow is opposite to generate damping, thereby achieving the effect of damping and shock absorption.

[0003] In the prior art, in order to improve the damping effect of the piston tube, an additional damping structure is provided on the middle and upper part of the piston tube away from the front fork tube. For example, the patent application number is CN200710078693.6, and the name is a motorcycle positive front shock absorber. In this patent, a damping hole is provided, and a diversion valve (protrusion) facing the inside of the piston tube is provided. While changing the inner diameter of the piston tube, it can also accelerate the introduction of fluid outside the piston tube, avoid or reduce the occurrence of vacuum phenomenon, thereby improving the damping effect and increasing the riding comfort and safety of the motorcycle.

[0004] Due to the thin wall of the piston tube, the connection between the guide valve and the piston tube (damping hole) is not firm. At the same time, the guide valve is a sheet-like structure as a whole. During the repeated piston movement of the shock absorber, the overall structure of the guide valve is prone to change, changing the use effect. In severe cases, there is a risk of the guide valve falling off, affecting the use of various components in the shock absorber.

[0005] For this reason, it is necessary to provide a piston tube which can adjust the damping of the shock absorber and ensure the long-term stable use of the shock absorber. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a positioning tube for a motorcycle front shock absorber. Without changing the overall structure of the positioning tube, the damping size of the shock absorber can be adjusted by using an additional insert, so that the entire positioning tube can be used continuously and stably in the shock absorber.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a positioning tube of a motorcycle front shock absorber, comprising a tube body and an insert fixedly embedded in the tube body, the insert being provided with a through cavity arranged along the center line direction of the tube body length, the through cavity presenting a cavity structure with one end being larger and the other end being smaller, and the larger end of the through cavity being arranged close to the front fork tube of the shock absorber.

[0008] Principle and effect of the utility model:

[0009] The tube body is equivalent to the piston tube, one end (upper end) of the tube body is connected to the front fork tube of the shock absorber, the other end (lower end) of the tube body is connected to the bottom of the cylinder, and the insert is fixed in the tube body. Since the insert has a through cavity with one end larger than the other, and the large end of the through cavity is close to the front fork tube, when the front fork tube moves downward (equivalent to the motorcycle encountering a raised obstacle), the squeezed fluid flows from the large hole to the small hole when passing through the insert. According to the Bernoulli principle, the fluid will quickly jet when it passes through the small hole from the large hole, so that the front fork tube can fall quickly, and the motorcycle wheel and the driving position can be quickly leveled; and when the front fork tube is reset under the action of the spring, at this time, the fluid flows from the small hole to the large hole, and there is a deceleration effect, so that the raised wheel can be slowly lowered, reducing the inertial impact, thereby increasing the riding comfort and safety of the motorcycle. The overall damping adjustment of the tube body can be achieved by changing the shape or size of the through cavity or a combination of the two, to ensure that the inserts in the tube body can adapt to different vehicle models, thereby adjusting the damping of the shock absorber while increasing the riding comfort and safety of the motorcycle.

[0010] Furthermore, the through cavity has a stepped hole structure, including a large end hole and a small end hole that are interconnected.

[0011] Furthermore, the large end hole is any one of a straight slot, a cross slot, a hexagonal hole, a square hole, a cylindrical hole, and a horn hole.

[0012] Furthermore, the small end hole is any one of a shrinkage hole and a cylindrical hole that is expanded toward the large end hole.

[0013] Furthermore, the through cavity is a hole-like structure with a narrowed opening.

[0014] Furthermore, the insert is located in the tube body near the connecting end of the tube body and the shock absorber front fork tube, the outer wall of the insert and the inner wall of the tube body are interference fit or threaded, and the center line of the through cavity and the center line of the tube body are colinearly arranged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A motorcycle front shock absorber structure in the prior art;

[0016] Figure 2 This is a structural schematic diagram of the positioning tube of the utility model;

[0017] Figure 3 It is a schematic diagram of the exploded structure of the tube body and insert of the utility model;

[0018] Figure 4 It is a schematic diagram of the structure of 14 kinds of inserts with different combinations of large end holes and small end holes when the through cavity of the utility model adopts a joint hole;

[0019] Figure 5 The two schematic diagrams are of the utility model in which the through cavity adopts the shrinking structure.

[0020] Figure 4 and Figure 5 In the diagram, each structure of the insert includes a cross-sectional view and a side view.

[0021] In the figure: tube body 1, fluid guide hole 11, insert 2, through cavity 21, large end hole 211, small end hole 212. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] like Figure 2 , 3 As shown, a positioning tube of a motorcycle front shock absorber includes a tube body 1 and an insert 2 fixed in the tube body 1. The insert 2 is provided with a through cavity 21 arranged along the length center line direction of the tube body 1. The through cavity 21 is a cavity structure with one end larger and the other end smaller, and the larger end of the through cavity 21 is arranged close to the front fork tube of the shock absorber.

[0024] The overall structure of the tube body 1 is basically consistent with the existing piston tube structure. Figure 2 , 3 As shown, the tube body 1 of the utility model is a tubular structure, the upper end of the tube body 1 is installed in cooperation with the front fork tube, the lower end of the tube body 1 is connected to the bottom of the barrel, and a plurality of fluid guide holes 11 are opened in the lower middle part of the tube body 1 to facilitate the passage of fluid between the outer wall of the tube body 1 and the inner wall of the barrel. On the basis of the existing, the utility model adds an insert 2, which is arranged near the upper end of the tube body 1 and fixed in the tube body 1. Since a through cavity 21 with one end larger than the other is provided on the insert 2, and the large end of the through cavity 21 is close to the front fork tube; when the front fork tube moves downward (equivalent to the motorcycle encountering a raised obstacle), the squeezed fluid flows from the large hole into the small hole when passing through the insert 2. According to the Bernoulli principle, the fluid will quickly jet when passing through the small hole from the large hole, so that the front fork tube can fall quickly, and the motorcycle wheel and the driving position can be quickly leveled; and when the front fork tube is reset under the action of the spring, at this time, the fluid flows from the small hole into the large hole, and there is a deceleration effect, so that the wheel after lifting can be slowly lowered, reducing the inertial impact, thereby increasing the riding comfort and safety of the motorcycle. The overall damping adjustment of the tube body 1 can be achieved by changing the shape or size of the through cavity 21 or a combination of the two, so as to ensure that the insert 2 in the tube body 1 can adapt to different models, so as to adjust the damping of the shock absorber while increasing the riding comfort and safety of the motorcycle.

[0025] The through cavity 21 only needs to ensure that one end is larger than the other end. To this end, the inner cavity structure of the through cavity 21 can be a cylindrical structure, a pumpkin-shaped structure, a rectangular structure, a quadrangular pyramid structure, a truncated pyramid structure, a stepped hole structure, etc. In this embodiment, the processing of the through cavity 21, the installation with the tube body 1, and the damping adjustment are convenient, such as Figure 2 , 3 As shown in Figures 4 and 5, the through cavity 21 is provided with a stepped hole structure, and includes a large end hole 211 and a small end hole 212 that are interconnected. The through cavity 21 with a stepped hole structure can be processed by turning, stamping or injection molding (plastic parts) on the large end hole 211 and the small end hole 212, respectively, so that the processing of the through cavity 21 is more diverse and the influence of processing errors can be reduced. At the same time, the shapes of the large end hole 211 and the small end hole 212 can also be designed separately according to needs without affecting each other; when the insert 2 and the tube body 1 are assembled for trial, the damping effect can also be adjusted by changing the structure or size of the large end hole 211 and the small end hole 212 respectively. After ensuring the optimal damping effect, the insert 2 and the tube body 1 are fixed to improve the comfort performance of the entire shock absorber.

[0026] In this embodiment, if Figure 2 , 3 As shown in Figure 4, the cooperation of the large end hole 211 and the small end hole 212 can not only control the fluid velocity, but also set the structure of the large end hole 211 and the small end hole 212 according to the installation method of the insert 2 and the tube body 1. The conventional fixing methods of the insert 2 and the tube body 1 are threaded connection and interference fit. If the insert 2 and the tube body 1 are threaded, the large end hole 211 can be set as a straight groove ( Figure 4 (5), (12)), cross slot ( Figure 4 (4), (11)), hexagonal hole ( Figure 4 (2), (9)), square hole ( Figure 4 Any of the structures shown in (7) and (14) above, the large end hole 211 can be matched with a rotating tool (bolt cutter, etc.) to facilitate the fixation of the insert 2 and the tube body 1. If the insert 2 and the tube body 1 are fixed by an interference fit, the large end hole 211 is set as a cylindrical hole ( Figure 4 (1), (8)), speaker hole ( Figure 4 Any of the above (3), (6), (10), and (13) can facilitate the assembly of the insert 2 and the tube body 1. Correspondingly, the structure of the small end hole 212 only needs to satisfy that the opening on the side away from the large end hole 211 is smaller than the opening on the side of the large end hole 211 away from the small end hole 212. For this purpose, the small end hole 212 can be a directional hole, a cylindrical hole, a horn hole, a truncated cone hole, a quadrangular truncated cone structure, etc. In this embodiment, in order to facilitate the processing of the small end hole 212, the small end hole 212 is a shrinkage hole ( Figure 4 (8)-(14)), cylindrical hole ( Figure 4 Any one of (1)-(7)).

[0027] In another embodiment of the present invention, Figure 5 As shown, the through cavity 21 is a hole-shaped structure with a narrowed opening. The through cavity 21 is a narrowed opening structure as a whole, and the structure of the through cavity 21 can be a truncated cone structure ( Figure 5 (a)), a tetrahedron ( Figure 5 The structure shown in (b) in the figure has a smaller resistance to the fluid flow and can make the fluid flow smoothly. The insert 2 with the through cavity 21 structure can be a truncated cone, a cylindrical structure, etc. The insert 2 is clamped in the tube body 1 by a punching machine to fix the insert 2 and the tube body 1.

[0028] In another embodiment of the present invention, in order to ensure a better damping effect when using the positioning tube, as Figure 2-5 As shown, the center line of the through cavity 21 and the center line of the tube body 1 are arranged colinearly.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A positioning tube for a motorcycle front shock absorber, Features: The invention comprises a tube body (1) and an insert (2) fixedly embedded in the tube body (1), wherein the insert (2) is provided with a through cavity (21) arranged along the length center line direction of the tube body (1), the through cavity (21) presents a cavity structure with one end larger and the other end smaller, and the larger end of the through cavity (21) is arranged close to the front fork tube of the shock absorber.

2. A positioning tube for a motorcycle front shock absorber according to claim 1, Features: The through cavity (21) is in a stepped hole structure, comprising a large end hole (211) and a small end hole (212) that are interconnected.

3. The positioning tube of a motorcycle front shock absorber according to claim 2, Features: The large end hole (211) is in the form of any one of a straight slot, a cross slot, a hexagonal hole, a square hole, a cylindrical hole, and a trumpet hole.

4. The positioning tube of a motorcycle front shock absorber according to claim 2, Features: The small end hole (212) is in the form of any one of a shrinkage hole and a cylindrical hole that is expanded toward the large end hole (211).

5. The positioning tube of the front shock absorber of a motorcycle according to claim 3, Features: The small end hole (212) is in the form of any one of a shrinkage hole and a cylindrical hole that is expanded toward the large end hole (211).

6. The positioning tube of a motorcycle front shock absorber according to claim 1, Features: The through cavity (21) is a hole-shaped structure with a narrowed opening.

7. A positioning tube for a motorcycle front shock absorber according to any one of claims 1 to 6, Features: The insert (2) is located inside the tube body (1) near the connecting end of the tube body (1) and the shock absorber front fork tube. The outer wall of the insert (2) and the inner wall of the tube body (1) are interference fit or threadedly fixed. The center line of the through cavity (21) and the center line of the tube body (1) are colinearly arranged.

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