Sliding sleeve structure of bicycle front fork damping device

Abstract

The utility model relates to a sliding sleeve structure of a bicycle front fork damping device, a bicycle front fork is composed of a front fork vertical pipe and a lower foot which is in butt joint with the bottom end of the front fork vertical pipe, and the lower foot is provided with two symmetrical inner pipes on the two sides and a fork foot pipe for the inner pipes to be inserted in a sliding mode. The fork leg structure is characterized in that a sliding sleeve allowing the inner pipe to be arranged in a sliding mode is arranged in each fork leg pipe, each sliding sleeve is provided with a through sliding hole allowing the inner pipe to be inserted in a sliding mode, a large-diameter oil storage section is formed in the middle section of each sliding hole, and the sliding sleeves are provided with a plurality of oil grooves communicated with the oil storage sections on the wall faces of the sliding holes. According to the bicycle front fork damping device, the strength of the sliding sleeve can be kept, meanwhile, the stability and supporting performance of the bicycle front fork damping device can be maintained, and the smoothness of the damping action is effectively improved.

Description

Technical Field

[0001] The utility model relates to a sliding sleeve structure of a bicycle front fork shock absorbing device, which is mainly used in the technical field of bicycles. Background Art

[0002] Bicycles are currently the lightest and most versatile means of transportation, offering both leisure and fitness benefits. Driven by technological advancements and improved road conditions, bicycle speeds have been continuously increasing. In recent years, manufacturers have not only prioritized the requirements for bicycle braking systems but have also continuously refined shock absorption. To mitigate the varying vibrations experienced during a bicycle's movement, various shock-absorbing devices are typically installed in various locations on the bicycle. For the handlebars, which control the direction of travel, these devices are typically located within the front fork, which connects the handlebars to the front wheel.

[0003] The conventional front fork is formed by connecting a lower leg for assembling the front wheel and a front fork vertical tube at the top end for arranging the handlebars, wherein the lower leg has two opposing inner tubes and fork leg tubes that slide relative to the inner tubes, so that the fork leg tubes are jointly assembled at both ends of a wheel axle of the front wheel. An elastic shock-absorbing group that can relatively produce a shock-absorbing effect is supported between the inner tube and the fork leg tube, so that the relative reciprocating vibration between the front fork and the front wheel can be reduced. In this way, the impact on the handlebars can be reduced, thereby avoiding discomfort to the rider's hands and improving their control.

[0004] However, the reciprocating sliding during shock absorption is mainly achieved by the relative sliding between the inner tube of the lower leg and the fork tube. Therefore, the stability and support between the two determine the smoothness of the shock absorption. When the stability and support between the inner tube and the fork tube are not good, the sliding smoothness between the two is also poor. In particular, when the lubrication between the two is insufficient, it is easy to cause relative wear between the two, further damaging their stability and support. Therefore, further improvement is needed. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a sliding sleeve structure for a shock absorbing device of a front fork of a bicycle, which can enable the shock absorbing device of the front fork to maintain better stability and support, effectively improve the smoothness of its vibration-absorbing action, thereby ensuring the controllable effect of the bicycle's traveling direction and enhancing riding safety. At the same time, it can provide lubrication between the inner tube of the lower leg and the fork leg tube, disperse the oil pressure stress, ensure the maintenance of the strength of the sliding sleeve in the shock absorbing device, and prevent the sliding sleeve from failing due to cracking or deformation, thereby effectively improving its practicality and overcoming the shortcomings of the prior art.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a sliding sleeve structure of a bicycle front fork shock absorbing device, the bicycle front fork is composed of a front fork vertical tube and a lower leg connected to the bottom end of the front fork vertical tube, wherein the lower leg has two inner tubes corresponding to each other on both sides, and the inner tubes can be synchronously slidably inserted into the interiors of the two opposite fork leg tubes, and an elastic shock absorber group that can produce a relative shock absorbing effect is supported between the inner tubes and the fork leg tubes; a sliding sleeve is respectively provided in the fork leg tubes, and the inner tube is slidably arranged in the sliding sleeve, the sliding sleeve has a sliding hole that passes through and can be slidably inserted by the aforementioned inner tube, an oil storage section is formed in the middle section of the sliding hole, and the sliding sleeve is provided with an oil groove connected to the oil storage section on the wall surface of the sliding hole.

[0007] Preferably, a ring plug is locked between the top end of the fork leg tube and the inner tube.

[0008] Preferably, the top edge of the sliding sleeve has a radially extending convex edge, and the inner portion of the fork leg tube is formed with a stepped retaining edge adjacent to the top end, so that the sliding sleeve can be limited on the stepped retaining edge of the fork leg tube by the convex edge.

[0009] Preferably, the oil storage section of the sliding sleeve forms an oil scraping straight surface corresponding to the lower edge of the inner tube sliding downward, and the oil storage section of the sliding sleeve forms an oil collecting conical surface corresponding to the upper edge of the inner tube sliding upward.

[0010] Preferably, the sliding sleeve forms an oil-inlet oblique cone surface that converges downward at the top edge of the sliding hole.

[0011] Preferably, the sliding sleeve has three oil grooves arranged at equal distances and angles.

[0012] Preferably, the oil groove of the sliding sleeve includes an upper groove located above the oil storage section, and the upper groove of the oil groove has a through hole end.

[0013] Preferably, the oil groove of the sliding sleeve includes a lower groove located below the oil storage section, and a closed end is formed at the bottom end of the lower groove of the oil groove.

[0014] The beneficial effect of the present invention is as follows: through the display of the aforementioned technical means, the present invention utilizes the sliding sleeve provided in the fork leg tube for the sliding of the inner tube, and the sliding sleeve is provided with the oil storage section and the evenly distributed axial oil grooves, so that the inner tube can obtain concentric sliding and good lubrication, and can maintain better stability and support during sliding without deteriorating the strength of the sliding sleeve, thereby improving the smoothness of the shock-absorbing action of the bicycle front fork, and dispersing the oil pressure stress, ensuring that the sliding sleeve in the shock-absorbing device is not damaged, thereby preventing the sliding sleeve from failing due to cracks or deformation, and extending its service life, thereby effectively improving its practicality and further realizing its economic benefits.

[0015] The present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional appearance diagram of this creation applied to a bicycle front fork.

[0017] Figure 2 This is a side view cross-sectional diagram of a single lower leg of a bicycle front fork applied to this invention.

[0018] Figure 3 This is a three-dimensional schematic diagram of the sliding sleeve structure of the bicycle front fork shock absorber device of this invention.

[0019] Figure 4 It is a cross-sectional schematic diagram of the sliding sleeve structure of the bicycle front fork shock absorbing device of the present invention.

[0020] Figure 5 The figure is a side cross-sectional schematic diagram of the sliding sleeve structure of the bicycle front fork shock absorbing device of the present invention.

[0021] Figure 6 This is a top-down cross-sectional schematic diagram of the sliding sleeve structure of the bicycle front fork shock absorber device of the present invention.

[0022] Figure 7 This is an enlarged schematic diagram of a single-side partial section of this invention applied to a bicycle front fork. DETAILED DESCRIPTION

[0023] like Figure 1 and Figure 2 As shown, the present invention is applied to a shock absorbing device for a bicycle front fork. The bicycle front fork 10 is composed of a front fork vertical tube 11 and a lower leg 12 connected to the bottom end of the front fork vertical tube 11. The top end of the front fork vertical tube 11 can be assembled with a horizontally arranged handlebar (not shown in the figure), and the lower leg 12 is used to assemble a front wheel (not shown in the figure). The lower leg 12 has two corresponding inner tubes 13 on both sides, and the inner tubes 13 can be synchronously slidably inserted into the interiors of two opposite fork leg tubes 14, so that the bottom ends of the fork leg tubes 14 can be used to jointly assemble two ends of a wheel axle of the front wheel. An elastic shock-absorbing group 15 (such as a plurality of elastic shock-absorbing groups 15) that can relatively produce a shock-absorbing effect is supported between the inner tube 13 and the fork leg tube 14. Figure 2 As shown), the elastic shock-absorbing group 15 between the inner tube 13 and the fork leg tube 14 can be used to reduce the relative reciprocating vibration between the bicycle front fork 10 and the front wheel to reduce the impact on the handle.

[0024] like Figure 1 、 Figure 2 and Figure 3As shown, the feature of this invention is that a sliding sleeve 20 is provided in each inner hole of the fork leg tube 14, and the inner tube 13 is slidably arranged in the sliding sleeve 20, so that the inner tube 13 can slide back and forth relative to the sliding sleeve 20 inside the fork leg tube 14 to enhance the stability and support of its reciprocating sliding. A ring plug 16 is locked between the inner hole of the fork leg tube 14 and the inner tube 13 at the top to prevent dust and moisture from entering the fork leg tube 14, thereby providing the sliding sleeve 20 with a waterproof and dustproof effect.

[0025] The detailed structure of the sliding sleeve 20 is as follows: Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the sliding sleeve 20 is a tubular body that can be plugged into the inner hole of the fork leg tube 14, and the top edge of the sliding sleeve 20 has a radially protruding flange 21, and the inner hole of the fork leg tube 14 is formed with a step retaining edge 18 near the top, so that the sliding sleeve 20 can be limited to the step retaining edge 18 of the fork leg tube 14 by the flange 21, and the sliding sleeve 20 has a sliding hole that passes through and can be slidably inserted into the inner tube 13. 22, the middle section of the sliding hole 22 is formed with a large diameter oil storage section 23 for filling a lubricating oil, and the oil storage section 23 of the sliding sleeve 20 is formed with an oil scraping surface 231 corresponding to the lower edge of the inner tube 13 sliding downward, so as to reduce the lubricating oil from entering the contact surface between the inner tube 13 and the lower section of the sliding sleeve 20 and prevent the lubricating oil from seeping downward. The oil storage section 23 of the sliding sleeve 20 is formed with an oil collection cone corresponding to the upper edge of the inner tube 13 sliding upward. The surface 232 allows the lubricating oil to be filled in the contact surface between the inner tube 13 and the upper section of the sliding sleeve 20. Furthermore, the sliding sleeve 20 is formed with an oil inlet oblique conical surface 24 that converges downward at the top edge of the sliding hole 22, so that the lubricating oil can be smoothly filled in the contact surface between the inner tube 13 and the upper section of the sliding sleeve 20. The sliding sleeve 20 is provided with a plurality of oil grooves 25 connected to the oil storage section 23 on the wall of the sliding hole 22. This invention mainly uses three oil grooves 25 arranged at equal distances and angles. In another embodiment, the oil channel 25 may include an upper channel 251 located above the oil storage section 23 and a lower channel 252 located below the oil storage section 23. Furthermore, the upper channel 251 of the oil channel 25 has a through-hole end 254 that penetrates the oil inlet tapered surface 24 to increase the flow of lubricating oil into the upper channel 251. The lower channel 252 of the oil channel 25 has a closed end 255 at its bottom to prevent the lubricating oil from leaking downward. This constitutes a sliding sleeve structure for a bicycle front fork shock absorber device that ensures strength and high smoothness.

[0026] When this creation is actually used, Figure 1 、 Figure 2 and Figure 7As shown, the sliding sleeve 20 is arranged in the fork leg tube 14 of the lower leg 12 of the bicycle front fork 10, and is provided for the inner tube 13 to slide relative thereto, so that the inner tube 13 and the fork leg tube 14 can produce reciprocating motion according to the effect of the elastic shock-absorbing group 15 absorbing and reducing vibration. Since the sliding sleeve 20 is provided with the oil storage section 23 for storing the lubricating oil, and cooperates with the evenly distributed oil grooves 25, it can provide stable lubrication and improve the concentricity of its sliding, thereby avoiding mutual wear and damage between the inner tube 13, the sliding sleeve 20 and the fork leg tube 14, and can provide better stability and support for the inner tube 13 when sliding without deteriorating the strength of the sliding sleeve 20, thereby improving the smoothness of the vibration reduction action of the bicycle front fork 10.

[0027] As can be seen from the above description, the sliding sleeve structure of the bicycle front fork shock absorber device of the present invention utilizes the sliding sleeve 20 provided in the fork leg tube 14 of the bicycle front fork 10 for the sliding of the inner tube 13, and the sliding sleeve 20 is provided with the oil storage section 23 and the evenly distributed axial oil grooves 25, so that the inner tube 13 can obtain concentric sliding and good lubrication, thereby avoiding mutual wear and damage between the inner tube 13, the sliding sleeve 20 and the fork leg tube 14, and providing better stability and support for the inner tube 13 when sliding without destroying the strength of the sliding sleeve 20, thereby improving the smoothness of the shock absorbing action of the bicycle front fork 10, ensuring the controllable effect of the bicycle's travel direction, and enhancing the safety of riding. At the same time, it can disperse the oil pressure stress, ensure that the strength of the sliding sleeve 20 in the shock absorber is maintained, and prevent the sliding sleeve 20 from failing due to cracking or deformation, which can effectively extend its service life and effectively improve its practicality.

Claims

1. A sliding sleeve structure for a bicycle front fork shock-absorbing device, the bicycle front fork comprising a front fork stem and a lower leg connected to the lower end of the front fork stem, wherein the lower leg has two inner tubes on either side thereof, the inner tubes being slidably inserted into the interiors of the two opposing fork leg tubes, and an elastic shock-absorbing group being supported between the inner tubes and the fork leg tubes to produce a relative shock-absorbing effect; the characteristics of the invention are: A sliding sleeve is respectively provided in the fork leg tube, and the inner tube is slidably provided in the sliding sleeve. The sliding sleeve has a sliding hole that passes through and can be slidably inserted into the inner tube. An oil storage section is formed in the middle section of the sliding hole. The sliding sleeve is provided with an oil groove on the wall of the sliding hole that is connected to the oil storage section.

2. The sliding sleeve structure of the bicycle front fork shock absorbing device according to claim 1, characterized in that: A ring plug is locked between the top end of the fork leg tube and the inner tube.

3. The sliding sleeve structure of the bicycle front fork shock absorbing device according to claim 1, characterized in that: The top edge of the sliding sleeve has a radially extending convex edge, and the inner portion of the fork leg tube is formed with a stepped retaining edge adjacent to the top end, so that the sliding sleeve can be limited on the stepped retaining edge of the fork leg tube by the convex edge.

4. The sliding sleeve structure of the bicycle front fork shock absorbing device according to claim 1, characterized in that: The oil storage section of the sliding sleeve forms an oil scraping straight surface corresponding to the lower edge of the inner tube sliding downward, and the oil storage section of the sliding sleeve forms an oil collecting cone surface corresponding to the upper edge of the inner tube sliding upward.

5. The sliding sleeve structure of the bicycle front fork shock absorbing device according to claim 1, characterized in that: The sliding sleeve is formed with an oil inlet oblique cone surface that converges downward at the top edge of the sliding hole.

6. The sliding sleeve structure of the bicycle front fork shock absorbing device according to claim 1, characterized in that: The sliding sleeve has three oil grooves arranged at equal distances and angles.

7. The sliding sleeve structure of the bicycle front fork shock absorbing device according to claim 6, characterized in that: The oil groove of the sliding sleeve includes an upper groove located above the oil storage section. The upper groove of the oil groove has a through hole end.

8. The sliding sleeve structure of the bicycle front fork shock absorbing device according to claim 6, characterized in that: The oil groove of the sliding sleeve includes a lower groove located below the oil storage section, and a closed end is formed at the bottom end of the lower groove of the oil groove.

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