Damping front fork

Abstract

The utility model discloses a damping front fork, which belongs to the technical field of bicycle accessories and comprises a front fork, a spring and a front tube, a lining integrally formed with the front tube is arranged in the lower end of the front tube, the upper portion of a vertical tube of the front fork is in sliding fit with the lining, and the spring externally provided with a protective sleeve is arranged on the outer side of the lower portion of the vertical tube and arranged between the front tube and a fork shoulder of the front fork. A limiting assembly is arranged in the middle of the front pipe and used for limiting the axial stroke of the vertical pipe. The vertical tube of the front fork can slide up and down in the lining through the lining embedded in the lower end of the front tube, and the front fork can be limited by the aid of the limiting component in the middle of the front tube. The matching size between the lining and the front fork can be more stable by utilizing the process of integrally forming the front pipe and the lining, the overall structure of the front fork is more stable, and the vehicle can run more stably; the spring is installed between the front pipe and the fork shoulder, buffering force can be provided for the front fork, the shock-proof rebounding effect is good, the protective sleeve plays a role in protecting the spring, and the overall appearance is more attractive.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycle accessories, and particularly relates to a shock-absorbing front fork. Background Art

[0002] The front fork of a bicycle is located at the front of the bicycle. The upper end of the front fork is connected to the handlebar, and the lower end of the front fork is matched with the front axle to form the steering system of the bicycle.

[0003] Due to the poor shock-absorbing function of the traditional bicycle front fork, when encountering uneven terrain, the vehicle body will have violent bumps under the impact of the ground, causing extreme discomfort to people. At present, most of the existing front fork shock-absorbing methods provide buffering by installing a vertical tube with a spring between the front fork and the sleeve. This shock-absorbing structure is complex and the loading and unloading are relatively cumbersome; moreover, the spring is exposed and prone to rust, and it is not beautiful. Content of the Utility Model

[0004] The purpose of the utility model is to provide a shock-absorbing front fork, aiming to solve the technical problems of the cumbersome shock-absorbing structure, inconvenient installation and easy rust of the exposed spring of the existing front fork.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A shock-absorbing front fork includes a front fork, a spring and a front tube. A bushing is arranged inside the lower end of the front tube. The upper part of the vertical tube of the front fork is arranged inside the bushing, and the vertical tube is in sliding fit with the bushing. The spring is arranged outside the lower part of the vertical tube. A protective sleeve is arranged outside the spring. The spring and the protective sleeve are arranged between the front tube and the fork shoulder of the front fork; a limiting component is arranged in the middle of the front tube for limiting the axial stroke of the vertical tube; the front tube and the bushing are integrally formed.

[0007] Preferably, the limiting component includes a limiting rod, a limiting piece and a cushion block. Two opposite limiting holes are arranged on the side wall of the front tube. The two ends of the limiting piece are fixed in the limiting holes. The lower end of the limiting rod can penetrate through the through holes in the middle of the limiting piece and the cushion block and be in threaded fit with the upper end of the vertical tube. The limiting rod has a clearance fit with both the limiting piece and the cushion block; the cushion block is made of an elastic material. A cushion block is arranged between the end cap of the limiting rod and the limiting piece, and between the limiting piece and the upper end face of the vertical tube.

[0008] Preferably, the limiting piece is a rectangular metal piece, and the limiting piece is punched into the two limiting holes of the front tube.

[0009] Preferably, the limiting piece includes a thin piece and a thick piece. The thin piece and the thick piece are stacked up and down inside the front tube. A limiting platform is arranged on the outer circle of the side of the thick piece that is matched with the limiting hole. The outer circle of the limiting platform can be matched with the inner wall of the front tube.

[0010] Preferably, both of the two cushion blocks are frustum-shaped cones. The large-diameter ends of the cushion blocks are respectively abutted against the end face of the end cap of the limiting rod and the lower end face of the thick sheet. An annular boss is provided on the large-diameter end face of the cushion block.

[0011] Preferably, a plurality of planes are circumferentially provided on the outer wall of the vertical pipe, and the inner hole of the bushing is a corresponding polygonal hole.

[0012] Preferably, the protective sleeve is a corrugated pipe made of an elastic material. The lower end of the protective sleeve is clamped on the lower positioning sleeve. The lower positioning sleeve is in tight fit with the vertical pipe and abuts against the fork shoulder. A table circle matching the upper end of the protective sleeve is provided at the upper end of the outer circle of the lower positioning sleeve; the upper end of the protective sleeve is clamped on the upper positioning sleeve. The upper positioning sleeve is in external thread fit with the lower end of the front pipe. An annular clamping groove matching the lower end of the protective sleeve is provided in the middle of the outer circle of the upper positioning sleeve.

[0013] Preferably, the bushing is made of plastic material, the front pipe is made of metal material, and the bushing is integrally injection-molded in the front pipe.

[0014] Preferably, a plurality of positioning holes are provided on the peripheral side walls of the front pipe. The plurality of positioning holes are circumferentially spaced along the side wall of the front pipe. A plurality of positioning protrusions matching the positioning holes are correspondingly provided on the peripheral outer walls of the bushing.

[0015] Preferably, there are two upper and lower circles of positioning holes on the peripheral side walls of the front pipe. Each circle of positioning holes has 4 and is evenly distributed in a cross shape on the side wall of the front pipe.

[0016] Compared with the prior art, the beneficial effects produced by the present utility model are as follows:

[0017] By embedding a bushing integrally formed with the lower end inside the front pipe, the vertical pipe of the front fork can slide up and down in the bushing. With the aid of the limiting component in the middle of the front pipe, the front fork can be limited; by installing a spring between the front pipe and the fork shoulder of the front fork, a buffering force can be provided for the front fork; and a protective sleeve is sleeved outside the spring, which can protect the spring and make the appearance more beautiful at the same time. The present utility model uses the process of integrally forming the front pipe and the bushing to make the matching dimensions between the inner bushing of the front pipe and the front fork more stable, ensure that the overall structure of the front fork is more firm, and ensure that the vehicle travels more smoothly; sleeving a protective sleeve outside the spring can extend the service life of the spring and make the appearance beautiful and generous at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model and do not constitute a limitation to the present utility model.

[0019] In the drawings:

[0020] Figure 1The external view of a shock-absorbing front fork provided by an embodiment of the present utility model;

[0021] Figure 2 is Figure 1 the front view of the shock-absorbing front fork in

[0022] Figure 3 is Figure 1 the right view of the shock-absorbing front fork in

[0023] Figure 4 is Figure 2 the A-A cross-sectional view of the shock-absorbing front fork in

[0024] Figure 5 is Figure 1 the exploded structural schematic diagram of the shock-absorbing front fork in

[0025] In the figure:

[0026] 1 - front fork; 2 - spring; 3 - front tube; 4 - bushing; 5 -; 6 -; 7 -; 8 -; 9 -; 10 -; 11 -; 12 -. Detailed implementation manners

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In the following detailed description of the present invention, some specific details are described in detail. However, those skilled in the art can also fully understand the present invention for the parts that are not described in detail.

[0028] In addition, those of ordinary skill in the art should understand that the accompanying drawings provided are only for explaining the purpose, features and advantages of the present invention, and the drawings are not actually drawn to scale.

[0029] At the same time, unless the context clearly requires, the words such as "including", "comprising" and the like in the whole specification and claims should be interpreted as the meaning of including rather than exclusive or exhaustive meaning; that is, it is the meaning of "including but not limited to".

[0030] Such as Figures 1-5As shown in the figure, a shock-absorbing front fork includes a front fork 1, a spring 2, and a front tube 3. A bushing 4 is provided inside the lower end of the front tube 3. The upper part of the vertical tube 11 of the front fork 1 is arranged inside the bushing 4, and the vertical tube 11 is slidably engaged with the bushing 4. The spring 2 is arranged outside the lower part of the vertical tube 11. A protective sleeve 5 is provided outside the spring 2. The spring 2 and the protective sleeve 5 are arranged between the front tube 3 and the fork shoulder 12 of the front fork 1. A limiting component is provided in the middle of the front tube 3 for limiting the axial stroke of the vertical tube 11. The front tube 3 and the bushing 4 are integrally formed. Among them, the bushing 4 is made of plastic material, the front tube 3 is made of metal material, and the bushing 4 is integrally injection-molded inside the front tube 3, which can make the matching dimensions between the inner bushing of the front tube and the front fork more stable, ensure the stability of the overall structure of the front fork, and is suitable for mass production.

[0031] In a specific embodiment of the present invention, as Figure 4 , 5 shown, the limiting component includes a limiting rod 6, a limiting piece 7, and a cushion block 8. Two opposite limiting holes 9 are provided on the side wall of the front tube 3. Both ends of the limiting piece 7 are fixed in the limiting holes 9. The lower end of the limiting rod 6 can pass through the through holes in the middle of the limiting piece 7 and the cushion block 8 and be threadedly engaged with the upper end of the vertical tube 11. The limiting rod 6 has a clearance fit with both the limiting piece 7 and the cushion block 8. The cushion block 8 is made of elastic material. Cushion blocks 8 are provided between the end cap 60 of the limiting rod 6 and the limiting piece 7, and between the limiting piece 7 and the upper end face of the vertical tube 11. Among them, both cushion blocks 8 are frustum-shaped. The large-diameter ends of the cushion blocks 8 are respectively abutted against the end face of the end cap 60 of the limiting rod 6 and the lower end face of the thick piece 72. An annular boss is provided on the large-diameter end face of the cushion block 8. The cooperation of the limiting piece and the limiting rod can limit the up and down stroke of the vertical tube, and the cushion block plays an auxiliary buffering role to prevent the limiting piece from being deformed due to excessive impact force.

[0032] During specific production, the limiting piece 7 is selected as a rectangular metal sheet, and the limiting piece 7 is punched into the two limiting holes 9 of the front tube 3. Among them, the limiting piece 7 includes a thin piece 71 and a thick piece 72. The thin piece 71 and the thick piece 72 are stacked up and down in the front tube 3. A limiting platform is provided on the outer circle of the side of the thick piece 72 that cooperates with the limiting hole 9, and the outer circle of the limiting platform can cooperate with the inner wall of the front tube 3. During assembly, the thick piece 72 is first inserted into the limiting 9 so that its limiting platform is stuck into the front tube 3, and then the thin piece 71 is punched into the limiting 9, which can ensure that the limiting piece is firmly fixed in the limiting hole. Compared with the existing welding fixation technology, this technology can avoid the phenomenon of the limiting piece slipping due to missed welding.

[0033] As Figure 4 shown, the limiting rod 6 is a long screw rod, and the end cap 60 at the top of the screw rod is spherical-crowned. A hexagonal counterbore 61 is provided at the top of the end cap 60, which is convenient for a wrench to apply force to it and screw the screw rod onto the top of the vertical tube.

[0034] Further optimize the above scheme, such as Figure 5 As shown, the outer wall of the vertical tube 11 is provided with multiple planes in the circumferential direction, and the inner hole of the bushing 4 is a polygonal hole corresponding thereto. At the same time, the side walls of the front tube 3 are provided with multiple positioning holes, which are arranged at intervals along the circumferential direction of the side walls of the front tube 3, and the outer walls of the bushing 4 are provided with multiple positioning protrusions 14 corresponding to the positioning holes. Figure 5 In the embodiment shown, two circles of positioning holes are provided on the side walls around the front tube 3, each circle of positioning holes is 4 and evenly distributed on the side walls of the front tube 3 in a cross shape. The bushing and the vertical tube cooperate through the polygonal plane, and the positioning protrusion cooperates with the positioning hole, so that the two can be kept relatively fixed, play a limiting role in the circumferential direction, and ensure that the front tube and the front fork rotate as a whole.

[0035] In a specific embodiment of the present invention, Figure 1 As shown, the protective sleeve 5 is a bellows made of elastic material, the lower end of the protective sleeve 5 is clamped on the lower positioning sleeve 10, the lower positioning sleeve 10 is tightly matched with the vertical tube 11 and abuts against the fork shoulder 12, and the upper end of the outer circle of the lower positioning sleeve 10 is provided with a table circle that matches the upper end of the protective sleeve 5; the upper end of the protective sleeve 5 is clamped on the upper positioning sleeve 13, the upper positioning sleeve 13 is matched with the external thread of the lower end of the front tube 3, and the middle part of the outer circle of the upper positioning sleeve 13 is provided with an annular clamping groove that matches the lower end of the protective sleeve 5. The protective sleeve is connected and fixed to the front tube and the front fork through a clamping structure, which is convenient for installation and disassembly.

[0036] To sum up, the utility model has the advantages of simple and compact structure and simple manufacturing process. The bushing is integrally injection molded in the front tube to ensure that the bushing is firmly fixed in the front tube, and at the same time the sliding fit size between the bushing and the front fork vertical tube can be kept consistent; the limit plate is assembled by stamping to ensure the firm connection between the limit plate and the front tube, the front tube and the front fork are connected and fixed by a limit rod, and the spring and the pad play a limit buffering role, which work together to ensure the shock absorption and rebound effect; the spring outer cover protective cover can make the appearance more beautiful and extend its service life.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the scope of protection of the claims of the utility model.

Claims

1. A shock-absorbing front fork, comprising a front fork, a spring and a front tube, characterized in that: A bushing is provided inside the lower end of the front tube. The upper part of the vertical tube of the front fork is arranged inside the bushing, and the vertical tube is in sliding fit with the bushing. The spring is arranged outside the lower part of the vertical tube, and a protective sleeve is arranged outside the spring. The spring and the protective sleeve are arranged between the front tube and the fork shoulder of the front fork. A limiting component is arranged in the middle of the front tube for limiting the axial stroke of the vertical tube. The front tube and the bushing are integrally formed.

2. The damping front fork according to claim 1, characterized in that: The limiting component includes a limiting rod, a limiting piece and a cushion block. Two opposite limiting holes are provided on the side wall of the front tube. The two ends of the limiting piece are fixed in the limiting holes. The lower end of the limiting rod can penetrate through the through holes in the middle of the limiting piece and the cushion block and be in threaded fit with the upper end of the vertical tube. The limiting rod is in clearance fit with both the limiting piece and the cushion block. The cushion block is made of an elastic material. Cushion blocks are arranged between the end cap of the limiting rod and the limiting piece, and between the limiting piece and the upper end face of the vertical tube.

3. The shock-absorbing front fork according to claim 2, wherein: The limiting piece is a rectangular metal sheet, and the limiting piece is punched into the two limiting holes of the front tube.

4. The shock-absorbing front fork according to claim 3, wherein: The limiting piece includes a thin sheet and a thick sheet. The thin sheet and the thick sheet are stacked up and down inside the front tube. A limiting platform is provided on the outer circle of the side of the thick sheet that cooperates with the limiting hole, and the outer circle of the limiting platform can cooperate with the inner wall of the front tube.

5. The shock-absorbing front fork according to claim 4, characterized in that: Both cushion blocks are in the shape of a truncated cone. The large-diameter ends of the cushion blocks are respectively abutted against the end face of the end cap of the limiting rod and the lower end face of the thick sheet. An annular convex platform is provided on the large-diameter end face of the cushion block.

6. The shock-absorbing front fork according to claim 1, wherein: A plurality of planes are circumferentially provided on the outer wall of the vertical tube, and the inner hole of the bushing is a corresponding polygonal hole.

7. A shock-absorbing front fork according to claim 1, characterized in that: The protective sleeve is a corrugated pipe made of an elastic material. The lower end of the protective sleeve is clamped on the lower positioning sleeve. The lower positioning sleeve is in tight fit with the vertical tube and abuts against the fork shoulder. A table circle for cooperating with the upper end of the protective sleeve is provided on the upper end of the outer circle of the lower positioning sleeve. The upper end of the protective sleeve is clamped on the upper positioning sleeve. The upper positioning sleeve is in threaded fit with the outside of the lower end of the front tube. An annular clamping groove for cooperating with the lower end of the protective sleeve is provided in the middle of the outer circle of the upper positioning sleeve.

8. The shock-absorbing front fork according to claim 1, characterized in that: The bushing is made of a plastic material, and the front tube is made of a metal material. The bushing is integrally injection-molded inside the front tube.

9. A shock-absorbing front fork according to any one of claims 1-8, characterized in that: A plurality of positioning holes are provided on the circumferential side walls of the front tube. The plurality of positioning holes are arranged at intervals along the circumferential direction of the side wall of the front tube. Corresponding positioning protrusions for cooperating with the positioning holes are provided on the circumferential outer walls of the bushing.

10. The damping front fork according to claim 9, characterized in that: There are two circles of positioning holes on the circumferential side walls of the front tube, with 4 positioning holes in each circle, and they are evenly distributed in a cross shape on the side wall of the front tube.

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