Carbon fiber bicycle crank set

Abstract

The utility model relates to the technical field of bicycles, in particular to a carbon fiber bicycle crank set which comprises a bicycle body bottom bracket and a crank mechanism, the crank mechanism comprises a middle shaft, a first crank, a second crank, two screw caps and a limiting assembly, the middle shaft is connected with the bicycle body bottom bracket in a sliding mode and penetrates through the bicycle body bottom bracket, and the first crank is connected with the middle shaft in a sliding mode. The first crank is slidably connected with the middle shaft and sleeves one end of the middle shaft, the second crank is slidably connected with the middle shaft and sleeves one end, away from the first crank, of the middle shaft, the two screw caps are in threaded connection with the middle shaft and are arranged on one side of the first crank and one side of the second crank respectively, the first crank and the second crank are hollow, and rib plates are arranged in the first crank and the second crank. Through the arrangement of the structure, the problems that an existing aluminum alloy crank is generally forged, is of an integral solid structure, and is heavy in weight and relatively poor in rigidity are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycles, in particular to a carbon fiber bicycle crankset. Background Technique

[0002] The bicycle crank is the part that connects the pedaling and the chainring in a bicycle. The main function of the bicycle crank is to transmit the pedaling force of the rider to the chainring, so as to drive the bicycle forward. The design of the crank enables the rider to generate power through the pedaling action and drive the bicycle. The bicycle crank pursues high strength, high rigidity, and at the same time requires light weight.

[0003] The existing aluminum alloy cranks are generally forged and have an overall solid structure, which is heavy in weight and relatively poor in rigidity. Content of the Utility Model

[0004] The purpose of the utility model is to provide a carbon fiber bicycle crankset, which solves the problems of the existing aluminum alloy cranks, which are generally forged, have an overall solid structure, are heavy in weight, and are relatively poor in rigidity.

[0005] To achieve the above object, the utility model provides a carbon fiber bicycle crankset, which includes a bottom bracket of the vehicle body and a crank mechanism. The crank mechanism includes a bottom bracket spindle, a first crank, a second crank, two screw caps and a limiting component. The bottom bracket spindle is slidably connected to the bottom bracket of the vehicle body and passes through the bottom bracket of the vehicle body. The first crank is slidably connected to the bottom bracket spindle and sleeved on one end of the bottom bracket spindle. The second crank is slidably connected to the bottom bracket spindle and sleeved on the end of the bottom bracket spindle far from the first crank. The two screw caps are threadedly connected to the bottom bracket spindle and are respectively arranged on one side of the first crank and the second crank. The first crank and the second crank are both hollow. Rib plates are arranged inside the first crank and the second crank. The limiting component is arranged at one end of the bottom bracket spindle.

[0006] Wherein, the crank mechanism further includes a chainring, and the chainring is bolted to the second crank and is located between the second crank and the bottom bracket of the vehicle body.

[0007] Wherein, the limiting component includes an adjusting nut, and the adjusting nut is threadedly connected to the bottom bracket spindle and is located on one side of the first crank.

[0008] Wherein, ten-tooth reverse taper splines are arranged at both ends of the bottom bracket spindle, and clamping grooves are arranged on the surfaces of the first crank and the second crank, and the clamping grooves are adapted to the ten-tooth reverse taper splines.

[0009] Wherein, one end of the two screw caps is provided with an internal five-point lock hole.

[0010] A carbon fiber bicycle crankset of the present utility model, wherein the bottom bracket spindle is slidably connected to the bottom bracket of the vehicle body and passes through the bottom bracket of the vehicle body. The first crank is slidably connected to the bottom bracket spindle and sleeved on one end of the bottom bracket spindle. The second crank is slidably connected to the bottom bracket spindle and sleeved on the end of the bottom bracket spindle away from the first crank. The two screw caps are threadedly connected to the bottom bracket spindle and are respectively arranged on one side of the first crank and the second crank. The first crank and the second crank are both hollow. Rib plates are arranged inside the first crank and the second crank. The limiting component is arranged at one end of the bottom bracket spindle. The first crank and the second crank are installed on the bottom bracket of the vehicle body through the screw caps. The first crank and the second crank are made of carbon fiber material, which reduces the overall weight. At the same time, a double-chamber structure is adopted, and the bending and torsion resistance strengths of the first crank and the second crank are enhanced through the rib plates. Brief Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0012] Figure 1 is a schematic structural diagram of the carbon fiber bicycle crankset of the present utility model.

[0013] Figure 2 is a schematic structural diagram of the first crank of the present utility model.

[0014] Figure 3 is a partial structural schematic diagram of the first crank of the present utility model.

[0015] Figure 4 is a cross-sectional schematic diagram of the first crank of the present utility model.

[0016] 1 - Bottom bracket of the vehicle body, 2 - Bottom bracket spindle, 3 - First crank, 4 - Second crank, 5 - Screw cap, 6 - Chainring, 7 - Fine-tuning nut, 8 - Ten-tooth reverse taper spline, 9 - Card slot, 10 - Rib plate. Detailed Embodiment

[0017] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation of the present utility model.

[0018] Please refer toFigures 1 to 4 , the utility model provides a carbon fiber bicycle crankset, which includes a bottom bracket 1 of the vehicle body and a crank mechanism. The crank mechanism includes a bottom bracket spindle 2, a first crank 3, a second crank 4, two screw caps 5 and a limiting component. The bottom bracket spindle 2 is slidably connected to the bottom bracket 1 of the vehicle body and passes through the bottom bracket 1 of the vehicle body. The first crank 3 is slidably connected to the bottom bracket spindle 2 and sleeved on one end of the bottom bracket spindle 2. The second crank 4 is slidably connected to the bottom bracket spindle 2 and sleeved on the end of the bottom bracket spindle 2 away from the first crank 3. The two screw caps 5 are threadedly connected to the bottom bracket spindle 2 and are respectively arranged on one side of the first crank 3 and the second crank 4. The first crank 3 and the second crank 4 are both hollow. Rib plates 10 are arranged inside the first crank 3 and the second crank 4. The limiting component is arranged at one end of the bottom bracket spindle 2.

[0019] In this embodiment, the first crank 3 and the second crank 4 are installed on the bottom bracket 1 of the vehicle body through the screw cap 5. The first crank 3 and the second crank 4 are made of carbon fiber material, which reduces the overall weight. At the same time, a double-chamber structure is adopted, and the rib plates 10 are used to strengthen the bending and torsion resistance of the first crank 3 and the second crank 4.

[0020] Furthermore, the crank mechanism further includes a chainring 6. The chainring 6 is bolted to the second crank 4 and is located between the second crank 4 and the bottom bracket 1 of the vehicle body.

[0021] In this embodiment, the chainring 6 is a transmission module and is connected to the second crank 4 by bolts. Chainrings 6 of different specifications can be installed according to the needs of users.

[0022] Furthermore, the limiting component includes an adjusting nut 7. The adjusting nut 7 is threadedly connected to the bottom bracket spindle 2 and is located on one side of the first crank 3.

[0023] In this embodiment, according to the tolerance length of the bottom bracket 1 of the vehicle body, the adjusting nut 7 is adjusted to adjust the gap between the first crank 3 and the bottom bracket 1 of the vehicle body, ensuring the accurate installation position of the first crank 3 and the second crank 4.

[0024] Furthermore, ten-tooth inverted taper splines 8 are arranged at both ends of the bottom bracket spindle 2. Card slots 9 are arranged on the surfaces of the first crank 3 and the second crank 4. The card slots 9 are adapted to the ten-tooth inverted taper splines 8.

[0025] In this embodiment, the ten-tooth inverted taper splines 8 are arranged in a ten-tooth inverted taper manner, which is convenient for the transmission of pedaling torque; in addition, through a combined structure, a redundant structure of adhesive and inverted taper thread tightening is adopted to fundamentally solve the reliability problem of the loosening of the directly embedded metal parts in the previous carbon fiber components.

[0026] Further, one end of each of the two screw caps 5 is provided with an internal five-point lock hole.

[0027] In this embodiment, the screw cap 5 locks the first crank 3 and the second crank 4, and the internal five-point lock hole facilitates the disassembly of the screw cap 5.

[0028] The above-disclosed is only a preferred embodiment of the present utility model, and of course, it cannot be used to limit the scope of rights of the present utility model. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present utility model still fall within the scope covered by the utility model.

Claims

1. A carbon fiber bicycle crankset, comprising a bottom bracket of the vehicle body, characterized in that, further comprising a crank mechanism, the crank mechanism includes a bottom bracket spindle, a first crank, a second crank, two screw caps and a limiting component, the bottom bracket spindle is slidably connected to the bottom bracket of the vehicle body and passes through the bottom bracket of the vehicle body, the first crank is slidably connected to the bottom bracket spindle and sleeved on one end of the bottom bracket spindle, the second crank is slidably connected to the bottom bracket spindle and sleeved on the end of the bottom bracket spindle away from the first crank, the two screw caps are threadedly connected to the bottom bracket spindle and are respectively arranged on one side of the first crank and the second crank, both the first crank and the second crank are hollow, rib plates are arranged inside both the first crank and the second crank, and the limiting component is arranged at one end of the bottom bracket spindle.

2. The carbon fiber bicycle crankset according to claim 1, characterized in that, the crank mechanism further includes a chainring, the chainring is bolted to the second crank and is located between the second crank and the bottom bracket of the vehicle body.

3. The carbon fiber bicycle crankset according to claim 2, characterized in that, the limiting component includes an adjusting nut, the adjusting nut is threadedly connected to the bottom bracket spindle and is located on one side of the first crank.

4. The carbon fiber bicycle crankset according to claim 3, characterized in that, both ends of the bottom bracket spindle are provided with ten-tooth reverse taper splines, and the surfaces of the first crank and the second crank are provided with card slots, and the card slots are adapted to the ten-tooth reverse taper splines.

5. The carbon fiber bicycle crankset according to claim 4, characterized in that, one ends of the two screw caps are provided with internal five-point lock holes.

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