Ultra-light expansion hanging core for carbon fiber front fork

Abstract

The utility model discloses an ultralight-weight expansion hanging core for a carbon fiber front fork, which comprises a supporting sleeve sleeved in an upper port of the carbon fiber front fork, an upper baffle and a lower baffle, and a central screw hole is machined in the lower baffle in a penetrating manner; wherein an upper inclined surface and a lower inclined surface are respectively processed in an upper port and a lower port of the supporting sleeve, four notches are processed on the supporting sleeve in a manner of extending from top to bottom, and the four notches divide the supporting sleeve into four expansion sheets with equal radians; the lower gear is positioned and clamped in a lower port of the supporting sleeve, a screw rod which penetrates through the supporting sleeve and is used for being spirally matched with a central screw hole of the lower gear is formed on the upper gear, and a thrust inclined surface which can extend into an upper port of the supporting sleeve is arranged on the peripheral surface of the upper gear; the thrust inclined surface is matched with the upper inclined surface of the support sleeve; and when the screw rod and the lower stopper are screwed in and screwed down, the expansion sheet is forced to expand outwards to lock and fix the support sleeve in the upper end opening of the carbon fiber front fork. The utility model has the advantages of light weight, high strength and simplicity in assembly, and can ensure firm connection without easy deformation or damage due to external force.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle parts, in particular to an ultra-lightweight expansion suspension core for a carbon fiber front fork. Background Art

[0002] At present, environmental protection cycling of bicycles is becoming more and more popular. To improve the riding performance of bicycles and reduce the fatigue of riders, lightweight is particularly important for bicycles. High-end bicycles use carbon fiber materials to make parts such as front forks and frames. However, the suspension cores commonly used in traditional carbon fiber front forks generally have many components, and both the volume and weight are relatively large. Therefore, there is a potential risk of damage to the carbon fiber front fork, reducing the riding experience. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an ultra-lightweight expansion suspension core for a carbon fiber front fork, which has a small volume, light weight, high strength, few required components, and is convenient for disassembly and assembly, aiming at the current situation of the above-mentioned prior art.

[0004] The technical solution adopted by the utility model to solve the above technical problem is as follows:

[0005] An ultra-lightweight expansion suspension core for a carbon fiber front fork includes a support sleeve sleeved on the upper port of the carbon fiber front fork, an upper retainer and a lower retainer. A central screw hole is processed through the lower retainer; wherein: upper and lower inclined surfaces are respectively processed in the upper port and the lower port of the support sleeve, and four cutouts are processed on the support sleeve extending from top to bottom. The four cutouts divide the support sleeve into four expansion pieces with equal radian; the lower retainer is positioned and clamped into the lower port of the support sleeve. The upper retainer is formed with a screw rod passing through the support sleeve for spiral cooperation with the central screw hole of the lower retainer, and the outer peripheral surface of the upper retainer has a thrust inclined surface that can extend into the upper port of the support sleeve; when the thrust inclined surface cooperates with the upper inclined surface of the support sleeve and the screw rod is screwed into the lower retainer, it forces the expansion pieces to expand in diameter outward to lock and fix the support sleeve in the upper port of the carbon fiber front fork.

[0006] To optimize the above technical solution, the specific measures taken further include:

[0007] An inner concave hexagon wrench hole is processed at the center of the top surface of the upper retainer, and an internal threaded hole is processed axially downward through the screw rod along the center of the hexagon wrench hole.

[0008] A flange edge is formed around the top surface of the upper retainer, and the bottom surface of the flange edge is positioned and matched with the plane of the upper port of the carbon fiber front fork.

[0009] Circular serrations for improving the biting and locking force between the support sleeve and the inner wall of the carbon fiber front fork are arranged on the outer peripheral surface of the support sleeve.

[0010] The outer peripheral surface of the lower retainer has a positioning inclined surface adapted to the lower inclined surface of the support sleeve.

[0011] The top surface of the lower sleeve is machined with a concave top surface annular groove, and the bottom surface of the lower sleeve is machined with a concave bottom surface annular groove.

[0012] The inclination angles of the above-mentioned upper inclined surface and lower inclined surface are both 6 degrees.

[0013] Compared with the prior art, a super-lightweight expansion core of the present utility model is composed of three components: a support sleeve, an upper sleeve, and a lower sleeve. It has a small volume and requires fewer components, so it is light in weight and will not add too much weight to the entire front fork system, meeting the lightweight requirement of bicycles and helping to improve the riding speed and handling performance. In the present utility model, an upper inclined surface and a lower inclined surface are respectively designed at the upper port and lower port of the support sleeve, and a thrust inclined surface is designed on the upper sleeve. When the upper sleeve and the lower sleeve are tightened, the thrust inclined surface of the upper sleeve can cooperate with the upper inclined surface of the support sleeve, causing the expansion pieces of the support sleeve to expand and tightly adhere to the upper port of the carbon fiber front fork, thereby locking and fixing the expansion core on the carbon fiber front fork.

[0014] The present utility model is light in weight, high in strength, simple in assembly, and can ensure a firm connection without being easily deformed or damaged by external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic semi-sectional structure view of the present utility model;

[0016] Figure 2 is an exploded view of the present utility model;

[0017] Figure 3 is a schematic structure view of the support sleeve of the present utility model;

[0018] Figure 4 is a schematic assembly structure view of the present utility model and the carbon fiber front fork. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further describes the embodiments of the present utility model in detail with reference to the accompanying drawings.

[0020] Figures 1 to 4 is a schematic structure and assembly view of the present utility model.

[0021] The reference numerals therein are: inclination angle α, notch K, support sleeve 1, upper inclined surface 1a, lower inclined surface 1b, expansion piece 11, annular serrated teeth 12, upper sleeve 2, thrust inclined surface 2a, internal hexagonal wrench hole 2b, internal threaded hole 2c, screw rod 21, flange edge 22, lower sleeve 3, central screw hole 3a, positioning inclined surface 3b, top surface annular groove 3c, bottom surface annular groove 3d, carbon fiber front fork 4, upper port plane 4a.

[0022] The utility model discloses an ultra-lightweight expansion hanger core for a carbon fiber front fork. This expansion hanger core is specifically designed for the front fork with a carbon fiber structure. It can be well combined with the carbon fiber front fork, avoid potential damage risks to the carbon fiber front fork, and meet the demand of bicycles for lightweight.

[0023] As Figures 1 to 4 shown, the ultra-lightweight expansion hanger core for the carbon fiber front fork of the utility model includes a support sleeve 1 sleeved in the upper port of the carbon fiber front fork 4, an upper retainer 2 and a lower retainer 3. A central screw hole 3a is formed through the center of the lower retainer 3, and the internal thread of the central screw hole 3a is M10. The support sleeve 1 is a hollow sleeve body. An upper inclined surface 1a with a taper is processed in its upper port, and a lower inclined surface 1b with a taper is processed in its lower port. And a total of four cuts K are processed on the support sleeve 1 extending downward from top to bottom. The four cuts K divide the support sleeve 1 into four equal-arc expansion pieces 11. Due to the existence of the cuts K, the expansion pieces 11 have a space for radial elastic deformation, so that the expansion pieces 11 can expand the diameter of the support sleeve 1 by expansion under the action of an external force. The lower retainer 3 of the utility model is arranged below the support sleeve 1 and mostly extends into the lower port of the support sleeve 1. The outer peripheral surface of the lower retainer 3 can be positioned and matched with the lower inclined surface 1b of the support sleeve 1, so that the lower retainer 3 is positioned and clamped in the lower port of the support sleeve 1. A screw rod 21 extending downward is formed at the center of the bottom surface of the upper retainer 2 of the utility model. The screw rod 21 can pass through the hollow hole of the support sleeve 1 and be screwed with the central screw hole 3a of the lower retainer 3. A tapered thrust inclined surface 2a is formed on the outer peripheral surface of the upper retainer 2. The thrust inclined surface 2a can extend into the upper port of the support sleeve 1 and be matched with the upper inclined surface 1a of the support sleeve 1. When the screw rod 21 of the upper retainer 2 is screwed and tightened with the lower retainer 3, the thrust inclined surface 2a will, under the action of the inclined surface with the upper inclined surface 1a, push the expansion pieces 11, forcing the expansion pieces 11 to expand in diameter outward, so that the outer peripheral surface of the support sleeve 1 is closely attached to the inner wall of the carbon fiber front fork 4, and the support sleeve 1 and the whole hanger core are locked and fixed in the upper port of the carbon fiber front fork 4.

[0024] In the embodiment, a concave hexagon wrench hole 2b is processed at the center of the top surface of the upper retainer 2 of the utility model. And an internal thread hole 2c axially penetrating the screw rod 21 downward is also processed in the upper retainer 2 along the center of the hexagon wrench hole 2b. The hexagon wrench hole 2b enables people to rotate the upper retainer 2 by using a hexagon wrench to facilitate the installation of the expansion hanger core.

[0025] In the embodiment, a flange 22 is also formed around the top surface of the upper retainer 2 of the utility model. The bottom surface of the flange 22 is positioned and matched with the upper port plane 4a of the carbon fiber front fork 4. The flange 22 can improve the placement stability of the expansion hanger core.

[0026] An annular spline 12 is arranged on the outer peripheral surface of the support sleeve 1 of the utility model. After the annular spline 12 contacts the inner wall of the carbon fiber front fork 4, it can improve the biting and locking force between it and the carbon fiber front fork 4.

[0027] In the embodiment, a positioning inclined surface 3b with a taper is designed on the outer peripheral surface of the lower block 3 of the present utility model, and the positioning inclined surface 3b is adapted to the lower inclined surface 1b of the support sleeve 1.

[0028] In the embodiment, a concave top surface annular groove 3c is machined on the top surface of the lower block 3 of the present utility model, and a concave bottom surface annular groove 3d is machined on the bottom surface of the lower block 3. The top surface annular groove 3c and the bottom surface annular groove 3d can reduce the total weight of the lower block 3, so that the lower block 3 meets the requirement of light weight while satisfying the use strength.

[0029] In the embodiment, the inclination angles α of the upper inclined surface 1a and the lower inclined surface 1b of the present utility model are both 6 degrees.

[0030] In the embodiment, the support sleeve 1, the upper block 2 and the lower block 3 of the present utility model are all made of carbon fiber materials. Of course, the support sleeve 1, the upper block 2 and the lower block 3 can also be made of other materials.

[0031] The expansion hanging core of the present utility model generates an expansion force through the change of the mechanical structure, so as to realize the firm connection between the hanging core and the front fork tube of the bicycle. It is small in volume, light in weight, and has sufficient strength to withstand various stresses during riding. It can ensure a firm connection and will not be easily deformed or damaged by external forces.

[0032] The best embodiment of the present utility model has been illustrated, and various changes or modifications made by those of ordinary skill in the art will not depart from the scope of the present utility model.

Claims

1. An ultra-lightweight expansion suspension core for a carbon fiber front fork, comprising a support sleeve (1) sleeved in an upper port of a carbon fiber front fork (4), an upper gear (2) and a lower gear (3), wherein the lower gear (3) is through-machined with a central screw hole (3a); wherein: The upper port and the lower port of the support sleeve (1) are respectively processed with an upper inclined surface (1a) and a lower inclined surface (1b), and the support sleeve (1) is processed with four cuts (K) extending from the top to the bottom, and the four cuts (K) divide the support sleeve (1) into four expansion pieces (11) with equal arcs; the lower gear (3) is positioned and inserted into the lower port of the support sleeve (1), and the upper gear (2) is formed with a protruding portion passing through the support sleeve (1) for connecting with the lower gear. The upper gear (2) is provided with a screw rod (21) spirally matched with the central screw hole (3a) of the upper gear (3), and the outer peripheral surface of the upper gear (2) has a thrust inclined surface (2a) that can extend into the upper port of the support sleeve (1); the thrust inclined surface (2a) is matched with the upper inclined surface (1a) of the support sleeve (1), and when the screw rod (21) and the lower gear (3) are screwed in and tightened, the expansion sheet (11) is forced to expand outwardly to lock and fix the support sleeve (1) in the upper port of the carbon fiber front fork (4).

2. The ultra-lightweight expansion hanging core for a carbon fiber front fork according to claim 1 is characterized by: The top surface center of the upper gear (2) is processed with a concave hexagonal wrench hole (2b), and the upper gear (2) is processed with an internal threaded hole (2c) axially penetrating the screw rod (21) downward along the center of the hexagonal wrench hole (2b).

3. The ultra-lightweight expansion hanging core for a carbon fiber front fork according to claim 2 is characterized by: A flange edge (22) is formed around the top surface of the upper gear (2), and the bottom surface of the flange edge (22) is positioned and matched with the upper port plane (4a) of the carbon fiber front fork (4).

4. The ultra-lightweight expansion hanging core for a carbon fiber front fork according to claim 3 is characterized by: An annular flower tooth (12) is provided on the outer peripheral surface of the support sleeve (1) for increasing the bite locking force between the support sleeve (1) and the inner wall of the carbon fiber front fork (4).

5. The ultra-lightweight expansion hanging core for a carbon fiber front fork according to claim 4 is characterized by: The outer peripheral surface of the lower block (3) has a positioning inclined surface (3b) adapted to the lower inclined surface (1b) of the support sleeve (1).

6. The ultra-lightweight expansion hanging core for a carbon fiber front fork according to claim 5 is characterized by: The top surface of the lower block (3) is processed with an inwardly concave top surface annular groove (3c), and the bottom surface of the lower block (3) is processed with an inwardly concave bottom surface annular groove (3d).

7. The ultra-lightweight expansion hanging core for a carbon fiber front fork according to claim 6 is characterized by: The inclination angles (α) of the upper inclined surface (1a) and the lower inclined surface (1b) are both 6 degrees.

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