Ultra-light expansion hanging core for carbon fiber front fork

Abstract

The invention 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 connecting piece is light in weight, high in strength and easy to assemble, firm connection can be guaranteed, and meanwhile the connecting piece is not prone to deformation or damage due to external force.

Description

Technical Field

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

[0002] At present, environmentally friendly bicycle riding is becoming more and more popular. In order to improve the riding performance of bicycles and reduce the fatigue of riders, lightweight is particularly important for bicycles. High-end bicycles will use carbon fiber materials for the front fork, frame and other parts. However, the suspension core used in traditional carbon fiber front forks generally has many parts, large size and weight, which can easily cause potential damage risks to the carbon fiber front fork, reducing the riding experience. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an ultra-lightweight expansion hanging core for a carbon fiber front fork with small size, light weight, high strength, few required parts and easy disassembly and assembly in view of the current status of the above-mentioned prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: The invention discloses an ultra-lightweight expansion hanging core for a carbon fiber front fork, comprising a support sleeve sleeved in an upper port of the carbon fiber front fork, and an upper gear and a lower gear, wherein the lower gear is through-machined with a center screw hole; wherein: an upper inclined surface and a lower inclined surface are respectively machined in the upper port and the lower port of the support sleeve, and four incisions extending from the top to the bottom are machined on the support sleeve, and the four incisions divide the support sleeve into four expansion pieces with equal arcs; the lower piece is positioned and inserted into the lower port of the support sleeve, and the upper piece is formed with a screw rod passing through the support sleeve for spirally cooperating with the center screw hole of the lower piece, and the outer peripheral surface of the upper piece has a thrust inclined surface that can extend into the upper port of the support sleeve; the thrust inclined surface cooperates with the upper inclined surface of the support sleeve, and when the screw rod and the lower piece are screwed in and tightened, the expansion piece is forced to expand outwardly to lock the support sleeve in the upper port of the carbon fiber front fork.

[0005] To optimize the above technical solutions, the specific measures taken also include: The center of the top surface of the upper gear is processed with a concave hexagonal wrench hole, and the upper gear is processed with an internal threaded hole axially penetrating the screw rod downward along the center of the hexagonal wrench hole.

[0006] A flange edge is formed around the top surface of the upper gear, and the bottom surface of the flange edge is matched with the upper port plane positioning of the carbon fiber front fork.

[0007] The outer peripheral surface of the support sleeve is provided with an annular flower tooth for improving the bite locking force between the support sleeve and the inner wall of the carbon fiber front fork.

[0008] The outer peripheral surface of the lower gear has a positioning inclined surface matched with the lower inclined surface of the support sleeve.

[0009] The top surface of the lower gear is processed with an inwardly concave top surface annular groove, and the bottom surface of the lower gear is processed with an inwardly concave bottom surface annular groove.

[0010] The inclination angles of the upper inclined surface and the lower inclined surface are both 6 degrees.

[0011] The above-mentioned support sleeve, upper gear and lower gear are all made of carbon fiber material.

[0012] Compared with the prior art, the ultra-lightweight expansion hanging core of the present invention is composed of three parts: a support sleeve, an upper gear and a lower gear. It is small in size and requires fewer parts, so it is light in weight and does not add too much weight to the entire front fork system. It meets the demand for lightweight bicycles and helps to improve riding speed and handling performance. The present invention is designed with an upper inclined surface and a lower inclined surface in the upper port and the lower port of the support sleeve, respectively, and a thrust inclined surface is designed in the upper gear. In this way, when the upper gear and the lower gear are tightened, the thrust inclined surface of the upper gear can cooperate with the upper inclined surface of the support sleeve, so that the expansion sheet of the support sleeve expands and fits tightly in the upper port of the carbon fiber front fork, thereby locking and fixing the expansion hanging core on the carbon fiber front fork.

[0013] The invention has the advantages of light weight, high strength, simple assembly, and can ensure a firm connection while not being easily deformed or damaged due to external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a half-section structure schematic diagram of the present invention; Figure 2 It is an exploded schematic diagram of the present invention; Figure 3 It is a structural schematic diagram of the support sleeve of the present invention; Figure 4 It is a schematic diagram of the assembly structure of the present invention and a carbon fiber front fork. DETAILED DESCRIPTION

[0015] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0016] Figures 1 to 4 It is a schematic diagram of the structure and assembly of the present invention.

[0017] The accompanying drawings are marked as follows: inclination angle α, cutout K, support sleeve 1, upper inclined surface 1a, lower inclined surface 1b, expansion piece 11, annular flower teeth 12, upper gear 2, thrust inclined surface 2a, hexagonal wrench hole 2b, internal threaded hole 2c, screw 21, flange edge 22, lower gear 3, center screw hole 3a, positioning inclined surface 3b, top annular groove 3c, bottom annular groove 3d, carbon fiber front fork 4, upper port plane 4a.

[0018] The invention discloses an ultra-lightweight expansion hanging core for a carbon fiber front fork. The expansion hanging core is specially designed for a front fork with a carbon fiber structure. The expansion hanging core can be well combined with the carbon fiber front fork to avoid potential damage risks to the carbon fiber front fork and meet the demand for lightweight bicycles.

[0019] like Figures 1 to 4 As shown, the ultra-lightweight expansion hanging core for the carbon fiber front fork of the present invention includes a support sleeve 1 and an upper gear 2 and a lower gear 3 which are sleeved in the upper port of the carbon fiber front fork 4. A central screw hole 3a is formed through the center of the lower gear 3, and the internal thread of the central screw hole 3a is M10. The support sleeve 1 is a hollow sleeve body, and a tapered upper inclined surface 1a is processed in the upper port thereof, and a tapered lower inclined surface 1b is processed in the lower port thereof, and a total of four cuts K are processed extending from top to bottom on the support sleeve 1, and the four cuts K divide the support sleeve 1 into four expansion pieces 11 with equal arcs. Due to the existence of the cuts K, the expansion piece 11 has space for radial elastic deformation, so that the expansion piece 11 can expand the diameter of the support sleeve 1 by expansion under the action of external force. The lower gear 3 of the present invention is arranged below the support sleeve 1 and extends mostly into the lower port of the support sleeve 1. The outer circumference of the lower gear 3 can be positioned and matched with the lower inclined surface 1b of the support sleeve 1, so that the lower gear 3 is positioned and clamped in the lower port of the support sleeve 1. The bottom center of the upper gear 2 of the present invention is formed with a screw rod 21 extending downward, and the screw rod 21 can pass through the hollow sleeve hole of the support sleeve 1 and spirally match with the central screw hole 3a of the lower gear 3. The outer circumference of the upper gear 2 is formed with a tapered thrust inclined surface 2a, and the thrust inclined surface 2a can extend into the upper port of the support sleeve 1 and match with the upper inclined surface 1a of the support sleeve 1. When the screw 21 of the upper gear 2 is screwed in and tightened with the lower gear 3, the thrust ramp 2a will push the expansion plate 11 under the action of the ramp of the upper ramp 1a, forcing the expansion plate 11 to expand outward, so that the outer peripheral surface of the support sleeve 1 is tightly fitted with the inner wall of the carbon fiber front fork 4, locking the support sleeve 1 and the entire suspension core in the upper port of the carbon fiber front fork 4.

[0020] In the embodiment, the top center of the upper gear 2 of the present invention is processed with a concave inner hexagonal wrench hole 2b, and the upper gear 2 is also processed with an inner threaded hole 2c axially penetrating the screw rod 21 downward along the center of the inner hexagonal wrench hole 2b. The inner hexagonal wrench hole 2b enables people to rotate the upper gear 2 with an inner hexagonal wrench to facilitate the installation of the expansion hanging core.

[0021] In the embodiment, the top surface of the upper gear 2 of the present invention is also formed with a flange 22, and 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 stability of the expansion hanging core placement.

[0022] The outer peripheral surface of the support sleeve 1 of the present invention is provided with an annular flower tooth 12 , and after the annular flower tooth 12 contacts with the inner wall of the carbon fiber front fork 4 , it can improve the bite locking force between the annular flower tooth 12 and the carbon fiber front fork 4 .

[0023] In the embodiment, the outer peripheral surface of the lower stop 3 of the present invention is designed with a tapered positioning inclined surface 3 b, and the positioning inclined surface 3 b is matched with the lower inclined surface 1 b of the support sleeve 1 .

[0024] In the embodiment, the top surface of the lower gear 3 of the present invention is processed with a concave top surface annular groove 3c, and the bottom surface of the lower gear 3 is processed with a concave bottom surface annular groove 3d. The top surface annular groove 3c and the bottom surface annular groove 3d can reduce the total weight of the lower gear 3, so that the lower gear 3 meets the requirements of lightness while meeting the use strength.

[0025] In the embodiment, the inclination angle α of the upper inclined surface 1a and the lower inclined surface 1b of the present invention are both 6 degrees.

[0026] In the embodiment, the support sleeve 1, the upper gear 2 and the lower gear 3 of the present invention are all made of carbon fiber material. Of course, the support sleeve 1, the upper gear 2 and the lower gear 3 can also be made of other materials.

[0027] The expansion hanging core of the present invention generates expansion force through changes in mechanical structure, thereby realizing a tight connection between the hanging core and the front fork tube of the bicycle. It is small in size, light in weight, and has sufficient strength to withstand various stresses during riding. It can ensure a firm connection while not being easily deformed or damaged by external forces.

[0028] The best embodiment of the present invention has been described, and various changes or modifications made by those skilled in the art will not depart from the scope of the present invention.

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.

8. The ultra-lightweight expansion hanging core for a carbon fiber front fork according to claim 7, characterized in that: The support sleeve (1), the upper gear (2) and the lower gear (3) are all made of carbon fiber material.

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