Carbon fiber bicycle crank assembly

Abstract

The invention discloses a carbon fiber bicycle crank assembly which comprises a left crank and a right crank which are connected through a metal connecting assembly. The metal connecting assembly comprises an outer shaft sleeve, a left connecting sleeve, a right connecting sleeve, a left fixing sleeve, a right fixing sleeve and an inner bolt locking assembly, a left bayonet for clamping one end of the left fixing sleeve is formed in the inner side end of the left crank, and a right bayonet for clamping one end of the right fixing sleeve is formed in the inner side end of the right fixing sleeve; the end, away from the right crank, of the right fixing sleeve is slidably sleeved with the right connecting sleeve, the other end of the right connecting sleeve is in threaded connection with the outer shaft sleeve, the ends, close to each other, of the left fixing sleeve and the right fixing sleeve are provided with meshing teeth, and axial sliding is locked and limited through an inner bolt locking assembly after the meshing teeth of the left fixing sleeve and the right fixing sleeve are meshed. According to the bicycle crank assembly, the stability of the bicycle crank assembly in the using process can be improved through the design that the left fixing sleeve and the right fixing sleeve are meshed with each other and the mode that the outer shaft sleeve is locked with internal and external threads of the internal bolt locking assembly.

Description

Technical Field

[0001] The present invention relates to a bicycle crank assembly, and more particularly to a carbon fiber bicycle crank assembly. Background Art

[0002] Due to the high precision requirements of track bicycle parts and the need for frequent maintenance to maintain optimal performance, in professional teams, the use and maintenance of each bicycle are strictly managed. For track bicycle athletes, when they need to train or compete in training venues in different regions, they need to transport their dedicated track bicycles.

[0003] Existing bicycle crank assemblies include a left crank, a right crank, and a connecting assembly connecting the left crank and the right crank. The connecting assembly generally includes a middle shaft sleeve connected to the middle hole of the bicycle frame (for the position of installing the pedal) and bolts for locking the left crank and the right crank. When locked by bolts, the left crank and the right crank will not have axial displacement during use. However, when locked by bolts, the situation of over-loose or over-tight locking may occur. Over-loose locking will cause looseness when pedaling the bicycle, and over-tight locking will cause excessive stress on the threads, resulting in thread damage and affecting subsequent disassembly, assembly, and maintenance. Summary of the Invention

[0004] The purpose of the present invention is to provide a carbon fiber bicycle crank assembly to solve the above technical problems.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A carbon fiber bicycle crank assembly includes a left crank and a right crank, characterized in that: the left crank and the right crank are connected by a metal connecting assembly; The metal connecting assembly includes an outer shaft sleeve, a left connecting sleeve, a right connecting sleeve, a left fixing sleeve, a right fixing sleeve, and an inner bolt locking assembly. One end of the left fixing sleeve is provided with a left bayonet for the other end of the left fixing sleeve to be clamped, and one end of the right fixing sleeve is provided with a right bayonet for the other end of the right fixing sleeve to be clamped. The right connecting sleeve is slidably sleeved on one end of the right fixing sleeve away from the right crank, and the other end is threadedly connected to the outer shaft sleeve. One end of the left fixing sleeve and one end of the right fixing sleeve, which are close to each other, are both provided with engaging teeth. After the engaging teeth of the left fixing sleeve and the right fixing sleeve are engaged, they are locked by the inner bolt locking assembly to restrict axial sliding.

[0006] Preferably, the inner bolt locking assembly includes an inner bolt locking member and an inner bolt mating member. The inner bolt locking member includes a bolt body, a lining sleeve, and a left connecting member. The left connecting member restricts the relative rotation of the bolt body and the lining sleeve. The bolt body is hollowly arranged, and the lining sleeve is rotatably arranged in the hollow interior of the bolt body through a one-way bearing. One side of the lining sleeve away from the inner bolt mating member is provided with an inner hexagonal groove; The inner part of the right fixing sleeve is provided with a central axis groove for the bolt body to be inserted into. An annular sleeve is slidably arranged on the inner wall of the right fixing sleeve. The outer part of the bolt body is provided with an external thread, and the inner circumferential wall of the annular sleeve is provided with an internal thread that meshes with the external thread on the bolt body. The inner bolt fitting is arranged inside the right fixing sleeve. The inner bolt fitting includes a right connecting piece. An L-shaped rod is connected between the right connecting piece and the annular sleeve. A first spring is arranged on the side of the right fixing sleeve away from the annular sleeve where the L-shaped rod is located. One end of the first spring is fixedly connected to the L-shaped rod, and the other end is fixedly connected to the right fixing sleeve. After the bolt body is threadedly connected to the annular sleeve and the left fixing sleeve and the right fixing sleeve are engaged, the left connecting piece unlocks the restriction on the bolt body and the inner lining sleeve through the cooperation with the right connecting piece.

[0007] Preferably, the left connecting piece includes a left base column fixed inside the hollow part of the inner lining sleeve. The outer circumference of the left base column is fixed to the inner lining sleeve through a left annular plate. An L-shaped locking rod is slidably arranged along the radial direction on the left base column. A locking rod groove for the wider end of the L-shaped locking rod to slide is arranged inside the left base column. A second spring for driving the L-shaped locking rod to slide towards the outer end of the left base column in the radial direction is arranged at the bottom of the locking rod groove. The inner lining sleeve is provided with a through hole, and the bolt body is provided with a jack hole that cooperates with the through hole. The long rod end of the L-shaped locking rod penetrates through the left base column, the left annular plate, the through hole and is inserted into the jack hole to make the bolt body and the inner lining sleeve relatively fixed. An unlocking rod is arranged on the outer side of the short rod end of the L-shaped locking rod. The unlocking rod extends to the outer end of the left base column in the radial direction. The right connecting piece includes a right base column. The right base column is coaxially arranged with the left base column. The right base column is provided with a column opening for one end of the left base column to be inserted into. After the left fixing sleeve and the right fixing sleeve are engaged, the left base column is inserted into the column opening, and the inner wall of the column opening presses the unlocking rod into the left base column.

[0008] Preferably, multiple groups of the L-shaped locking rods are arranged along the circumferential side of the left base column. The end of the unlocking rod outside the left base column is provided with a first tapered surface that abuts against the opening of the column opening.

[0009] Preferably, the inner wall of the central axis groove is provided with an annular groove for the annular sleeve to slide axially along the right fixing sleeve. The circumference of the right base column is slidably arranged in the right fixing sleeve through a right annular plate. The outer wall of the right annular plate is fixedly connected to the annular sleeve through an L-shaped rod. The inner wall of the central axis groove is provided with a strip-shaped groove for the L-shaped rod to slide. An inner groove communicating with the sliding groove is also arranged in the right fixing sleeve. The first spring is arranged in the inner groove.

[0010] Preferably, an extension rod is provided at one end of the L-shaped rod away from the annular sleeve. A slider is slidably arranged in the inner groove. One end of the first spring is fixed in the inner groove and the other end is fixedly connected to the slider. One end of the extension rod extends into the inner groove and forms a sliding connection with the inner groove. A Z-shaped rod for connecting the slider is arranged in the right base column. The Z-shaped rod is slidably arranged on the right base column along the radial direction of the right base column. A convex column is arranged in the column opening. A column hole for the convex column to be inserted into is provided on one side of the left base column. One end of the Z-shaped rod extends into the convex column, the other end extends outside the extension rod and is inserted into the slider. An unlocking block is arranged at one end of the Z-shaped rod located in the convex column, and a locking block is arranged at one end of the Z-shaped rod located in the slider. A locking groove for the locking block to be clamped is arranged in the slider. After the left fixing sleeve and the right fixing sleeve are engaged, the left base column is inserted into the column opening, and the inner wall of the column hole presses the unlocking block into the convex column. After the unlocking block is pressed into the convex column, the locking block disengages from the locking groove and the slider returns to the initial position. A third spring for driving the Z-shaped rod to slide towards the outer end of the convex column in the radial direction is arranged in the convex column.

[0011] Preferably, the Z-shaped rod includes a first cross bar, a second cross bar and a vertical bar. A first cross bar groove for the first cross bar to slide along the radial direction is arranged in the convex column. The third spring is fixed at the bottom end of the first cross bar groove and abuts against the first cross bar. The unlocking block is fixed at one end of the first cross bar and the outer end extends to the outer end of the convex column. A second conical surface is arranged at one end of the unlocking block located outside the convex column. A second cross bar groove for the second cross bar to slide is arranged in the extension rod, and a matching groove for the second cross bar to slide is arranged in the slider. A second inclined surface is arranged at one end of the locking block. A vertical bar groove for the vertical bar to slide is arranged on the annular plate.

[0012] Preferably, the left fixing sleeve includes a left sleeve ring and a left sleeve rod. A plurality of rib strips are arranged on the inner wall of the left bayonet. Rib grooves matched with the rib strips are arranged on the outer wall of the left sleeve ring. A plurality of groups of left annular sealing grooves are also arranged on the left sleeve ring; the right fixing sleeve includes a right sleeve ring and a right sleeve rod. A plurality of rib strips are arranged on the inner wall of the right bayonet. Rib grooves matched with the rib strips are arranged on the outer wall of the right sleeve ring. A plurality of groups of right annular sealing grooves are also arranged on the left sleeve ring.

[0013] Preferably, a limiting step is arranged in the left sleeve rod. An abutting step for abutting against the limiting step is arranged at the outer end of the bolt body.

[0014] Preferably, a left conical transition section is arranged between the left sleeve ring and the left sleeve rod. One end of the left connecting sleeve is threadedly connected to the outer shaft sleeve, and the other end is provided with a conical end adapted to the conical transition section; a right conical transition section is arranged between the right sleeve ring and the right sleeve rod. One end of the right connecting sleeve is threadedly connected to the outer shaft sleeve, and the other end is provided with a conical end adapted to the conical transition section.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By means of the internal and external thread locking of the outer shaft sleeve and the internal bolt locking assembly, the stability of the bicycle crank assembly during use can be improved; The internal bolt locking member includes a bolt body, a lining sleeve, and a left connecting member. An annular sleeve is slidably provided on the inner wall of the right fixing sleeve. The outer part of the bolt body is provided with an external thread, and the inner circumferential wall of the annular sleeve is provided with an internal thread that meshes with the external thread on the bolt body. The bolt body is threadedly connected to the annular sleeve and after the left fixing sleeve and the right fixing sleeve are engaged, the left connecting member unlocks the restriction on the bolt body and the lining sleeve through the cooperation with the right connecting member. After the bolt body locks the annular sleeve and the annular sleeve presses against the inner wall of the annular groove, the lining sleeve cannot drive the bolt body to rotate any further, preventing the bolt from locking the right fixing sleeve too tightly or too loosely, ensuring the overall strength stability of the crank assembly and facilitating disassembly, installation, and maintenance later; By providing the L-shaped rod and the second spring, it is necessary to overcome the tension of the second spring for the bolt body to lock the annular sleeve and make the annular sleeve press against the inner wall of the annular groove. The second spring is connected to the L-shaped rod through the cooperation of the slider and the Z-shaped rod. After the annular sleeve presses against the inner wall of the annular groove, the second spring is separated from the L-shaped rod, converting the tension of the second spring that needs to be overcome for the annular sleeve to press against the inner wall of the annular groove into the force for the annular sleeve to press against the annular groove, so that the force for the bolt body to lock the annular sleeve is of an appropriate magnitude. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the exploded schematic diagram of the overall structure of the present invention; Figure 3 is the sectional schematic diagram of the overall structure of the present invention; Figure 4 is the sectional schematic diagram of the present invention highlighting the inner walls of the left fixing sleeve and the right fixing sleeve; Figure 5 is Figure 4 the enlarged schematic diagram of part A in Figure 6 is the structural schematic diagram of the present invention highlighting the left base column; Figure 7 is the structural schematic diagram of the present invention highlighting the right base column; Figure 8 is the exploded schematic diagram of the present invention highlighting the right base column and the slider.

[0018] In the accompanying drawings, the list of components represented by each reference numeral is as follows: 1. Left crank; 2. Right crank; 3. Outer shaft sleeve; 4. Left connecting sleeve; 5. Right connecting sleeve; 6. Left fixing sleeve; 61. Left collar; 62. Left sleeve rod; 7. Right fixing sleeve; 71. Right collar; 72. Right sleeve rod; 8. Inner bolt locking assembly; 81. Inner bolt locking member; 811. Bolt body; 812. Inner lining sleeve; 813. Left base column; 82. Right base column; 9. Left bayonet; 10. Right bayonet; 11. Engaging teeth; 12. Ribs; 13. Rib grooves; 14. Left annular sealing groove; 15. Right annular sealing groove; 16. Hexagon socket; 17. Middle shaft groove; 18. Annular sleeve; 19. Annular groove; 20. External thread; 21. Internal thread; 22. L-shaped rod; 23. First spring; 24. Left annular plate; 25. L-shaped locking rod; 26. Locking rod groove; 27. Second spring; 28. Through hole; 29. Jack; 30. Unlocking rod; 31. Column port; 32. First conical slope; 33. Right annular plate; 34. Strip groove; 35. Inner groove; 36. Extension rod; 37. Slide block; 38. Z-shaped rod; 381. First cross bar; 382. Second cross bar; 383. Vertical rod; 39. Convex column; 40. Column hole; 41. Third spring; 42. First cross bar groove; 43. Unlocking block; 44. Second conical slope; 45. Second cross bar groove; 46. Matching groove; 47. Second slope; 48. Vertical rod groove; 49. Locking groove; 50. Limiting step; 51. Abutting step; 52. Left conical transition section; 53. Right conical transition section; 54. Locking block; 55. One-way bearing. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figure 1-8 , the present invention provides a technical solution: Refer to Figure 1 , a carbon fiber bicycle crank assembly includes a left crank 1 and a right crank 2, and the left crank 1 and the right crank 2 are connected by a metal connection assembly; Refer to Figure 2 , 3, the metal connection assembly includes an outer shaft sleeve 3, a left connecting sleeve 4, a right connecting sleeve 5, a left fixing sleeve 6, a right fixing sleeve 7, and an inner bolt locking assembly 8. The inner side end of the left crank 1 is provided with a left bayonet 9 for clamping one end of the left fixing sleeve 6. The inner side end of the right fixing sleeve 7 is provided with a right bayonet 10 for clamping one end of the right fixing sleeve 7. The right connecting sleeve 5 is slidably sleeved on one end of the right fixing sleeve 7 away from the right crank 2, and the other end is threadedly connected to the outer shaft sleeve 3. One ends of the left fixing sleeve 6 and the right fixing sleeve 7 close to each other are both provided with engaging teeth 11. After the engaging teeth 11 of the left fixing sleeve 6 and the right fixing sleeve 7 are engaged, they are locked by the inner bolt locking assembly 8 to restrict axial sliding. Among them, the left fixing sleeve 6 is inserted into the left bayonet 9 and fixed to the left crank 1 by applying AB glue on the surface. The right fixing sleeve 7 is inserted into the right bayonet 10 and fixed to the right crank 2 by applying AB glue on the surface.

[0021] To increase the connection strength between the left connecting sleeve and the left crank 1, the left fixing sleeve 6 includes a left sleeve ring 61 and a left sleeve rod 62. The inner wall of the left bayonet 9 is provided with multiple ribs 12. The outer wall of the left sleeve ring 61 is provided with rib grooves 13 that cooperate with the ribs 12. The left sleeve ring 61 is also provided with multiple groups of left annular sealing grooves 14, which can also increase the gluing effect when fixed with AB glue. To increase the connection strength between the right connecting sleeve and the right crank 2, the right fixing sleeve 7 includes a right sleeve ring 71 and a right sleeve rod 72. The inner wall of the right bayonet 10 is provided with multiple ribs 12. The outer wall of the right sleeve ring 71 is provided with rib grooves 13 that cooperate with the ribs 12. The left sleeve ring 61 is also provided with multiple groups of right annular sealing grooves 15, which can also increase the gluing effect when fixed with AB glue.

[0022] Refer to Figure 2 , 4 -8, the inner bolt locking assembly 8 includes an inner bolt locking member 81 and an inner bolt fitting. The inner bolt locking member 81 includes a bolt body 811, a lining sleeve 812, and a left connecting member. The left connecting member restricts relative rotation between the bolt body 811 and the lining sleeve 812. The bolt body 811 is hollow. The lining sleeve 812 is rotatably arranged in the hollow interior of the bolt body 811 through a one-way bearing 55. The side of the lining sleeve 812 away from the bolt fitting is provided with an inner hexagonal groove 16. The inner part of the right fixing sleeve 7 is provided with a central shaft groove 17 for the bolt body 811 to be inserted into. The inner wall of the right fixing sleeve 7 is provided with an annular sleeve 18. The inner wall of the central shaft groove 17 is provided with an annular groove 19 for the annular sleeve 18 to slide axially along the right fixing sleeve 7. The outer part of the bolt body 811 is provided with an external thread 20. The circumferential inner wall of the annular sleeve 18 is provided with an internal thread 21 that meshes with the external thread 20 on the bolt body 811. In the initial state, by rotating the lining sleeve 812 to drive the bolt body 811 to rotate, the bolt body 811 rotates and drives the threaded sleeve to move towards the left fixing sleeve 6 side through the threaded fit with the annular sleeve 18. When the annular sleeve 18 moves to a position where it abuts against one side wall of the annular groove 19, it is the final locking position.

[0023] The inner bolt fitting is arranged inside the right fixing sleeve 7. The inner bolt fitting includes a right connecting piece. There is an L-shaped rod 22 connected between the right connecting piece and the annular sleeve 18. Inside the right fixing sleeve 7, on the side of the L-shaped rod 22 away from the annular sleeve 18, there is a first spring 23. One end of the first spring 23 is fixedly connected to the L-shaped rod 22, and the other end is fixedly connected to the right fixing sleeve 7. After the bolt body 811 is threadedly connected to the annular sleeve 18 and the left fixing sleeve 6 and the right fixing sleeve 7 are engaged and positioned, the left connecting piece unlocks the restriction on the bolt body 811 and the inner lining sleeve 812 through cooperation with the right connecting piece. The bolt body 811 and the inner lining sleeve 812 rotate relative to each other after the left fixing sleeve 6 and the right fixing sleeve 7 are relatively pressed, so that the bolt can be over-locked, protecting the thread on the premise of ensuring the locking strength between the bolt body 811 and the annular sleeve 18, which is beneficial to the disassembly, assembly and maintenance of the subsequent bicycle crank assembly.

[0024] Refer to Figure 2 、 4 -8, the left connecting piece includes a left base column 813 fixed inside the hollow of the inner lining sleeve 812. The outer periphery of the left base column 813 is fixed inside the inner lining sleeve 812 through a left annular plate 24. An L-shaped locking rod 25 is slidably arranged on the left base column 813 along the radial direction. There is a locking rod groove 26 in the left base column 813 for the wider end of the L-shaped locking rod 25 to slide. At the bottom of the locking rod groove 26, there is a second spring 27 for driving the L-shaped locking rod 25 to slide towards the outer end of the left base column 813 in the radial direction. There is a through hole 28 on the inner lining sleeve 812, and there is a jack 29 on the bolt body 811 that cooperates with the through hole 28. The long rod end of the L-shaped locking rod 25 passes through the left base column 813, the left annular plate 24, the through hole 28 and is inserted into the jack 29 to make the bolt body 811 and the inner lining sleeve 812 relatively fixed. On the outer side of the short rod end of the L-shaped locking rod 25, there is an unlocking rod 30. The unlocking rod 30 extends to the outer end of the left base column 813 in the radial direction. The right connecting piece includes a right base column 82. The right base column 82 is coaxially arranged with the left base column 813. There is a column opening 31 on the right base column 82 for one end of the left base column 813 to be inserted. After the left fixing sleeve 6 and the right fixing sleeve 7 are engaged, the left base column 813 is inserted into the column opening 31, and the inner wall of the column opening 31 presses the unlocking rod 30 into the left base column 813. After being locked to the left fixing sleeve 6 and the right fixing sleeve 7 and pressed tightly through the bolt body 811 and the annular sleeve 18, the unlocking rod 30 slides under the action of the inner wall of the column opening 31, so that one end of the unlocking rod 30 disengages from the jack 29, so that when the inner lining sleeve 812 is rotated continuously, it cannot drive the bolt body 811 to rotate continuously, avoiding excessive meshing of the external thread 20 of the bolt body 811 and the internal thread 21 of the annular sleeve 18 and causing excessive stress.

[0025] Refer to Figure 4 、 6, A plurality of groups of L-shaped locking rods 25 are arranged along the circumferential side of the left base column 813. One end of the unlocking rod 30 located outside the left base column 813 is provided with a first conical surface 32 that abuts against the opening of the column port 31. By providing the first conical surface 32, when the left base column 813 enters the column port 31, the inner wall of the column port 31 can more easily squeeze the unlocking rod 30.

[0026] Refer to Figure 4 , The circumference of the right base column 82 is slidably arranged in the right fixed sleeve 7 through the right annular plate 33. The outer wall of the right annular plate 33 is fitted with the inner wall of the central axis groove 17, making the right base column 82 more stable when sliding along the axis of the right fixed seat. The outer wall of the right annular plate 33 is fixedly connected to the annular sleeve 18 through the L-shaped rod 22. A strip-shaped groove 34 for the L-shaped rod 22 to slide is provided on the inner wall of the central axis groove 17. An inner groove 35 communicating with the sliding groove is also provided in the right fixed sleeve 7. The first spring 23 is arranged in the inner groove 35.

[0027] Refer to Figure 4 , 56, 7, 8. In order to make the L-shaped rod 22 lose the pulling force of the first spring 23 after the bolt body 811 locks the annular sleeve 18, and convert the pulling force of the first spring 23 into the pressure of the annular sleeve 18 on the inner wall of the annular groove 19 (the force required for all the first springs 23 to deform to the deformation amount when the annular sleeve 18 fits the inner wall of the annular groove 19 near the left fixing sleeve 6 is the appropriate pressure for the annular sleeve 18 to press the inner wall of the annular groove 19), an extension rod 36 is provided at one end of the L-shaped rod 22 away from the annular sleeve 18. A slider 37 is slidably provided in the inner groove 35. One end of the first spring 23 is fixed to the inner wall of the inner groove 35 and the other end is fixedly connected to the slider 37. One end of the extension rod 36 extends into the inner groove 35 and forms a sliding connection with the inner groove 35. A Z-shaped rod 38 for connecting the slider 37 is provided in the right base column 82. The Z-shaped rod 38 is slidably arranged on the right base column 82 along the radial direction of the right base column 82. A convex column 39 is provided in the column opening 31. A column hole 40 for the convex column 39 to be inserted into is provided on one side of the left base column 813. One end of the Z-shaped rod 38 extends into the convex column 39, the other end extends outside the extension rod 36 and is inserted into the slider 37. An unlocking block 43 is provided at one end of the Z-shaped rod 38 located in the convex column 39. A locking block 54 is provided at one end of the Z-shaped rod 38 located in the slider 37. A locking groove 49 for the locking block 54 to be engaged with is provided in the slider 37. After the left fixing sleeve 6 and the right fixing sleeve 7 are engaged, the left base column 813 is inserted into the column opening 31, and the inner wall of the column hole 40 presses the unlocking block 43 into the convex column 39. After the unlocking block 43 is pressed into the convex column 39, the locking block 54 disengages from the locking groove 49 and the slider 37 returns to its initial position. A third spring 41 for driving the Z-shaped rod 38 to slide towards the outer end of the convex column 39 in the radial direction is provided in the convex column 39. After the convex column 39 enters the column hole 40, after the Z-shaped rod 38 slides and the locking block 54 disengages from the locking groove 49, the first spring 23 will pull the slider 37 back to its initial position, thereby converting the force of all the first springs 23 into the pressure of the annular sleeve 18 on one side inner wall of the annular groove 19, and at the same time, it can prevent the slider 37 from continuously pulling the annular sleeve 18 through the L-shaped rod 22, and protect the thread of the annular sleeve 18 and the bolt body 811.

[0028] Refer to Figure 4 , 5, 7, 8, the Z-shaped rod 38 includes a first crossbar 381, a second crossbar 382 and a vertical rod 383. The convex column 39 is provided with a first crossbar groove 42 for the first crossbar 381 to slide radially. The third spring 41 is fixed to the bottom end of the first crossbar groove 42 and abuts against the first crossbar 381. The unlocking block 43 is fixed to one end of the first crossbar 381 and its outer end extends to the outer end of the convex column 39. The unlocking block 43 is provided with a second tapered surface 44 at one end located outside the convex column 39. The extension rod 36 is provided with a second crossbar groove 45 for the second crossbar 382 to slide. The slider 37 is provided with a mating groove 46 for the second crossbar 382 to slide. One end of the locking block 54 is provided with a second inclined surface 47. The annular plate is provided with a vertical rod groove 48 for the vertical rod 383 to slide. The Z-shaped rod 38 slides radially along the right base column 82. And due to the arrangement of the second inclined surface 47 and the second tapered surface 44 at both ends of the Z-shaped rod 38, when the L-shaped locking rod 25 is disengaged from the jack 29, the locking block 54 can be disengaged from the locking groove 49 in the slider 37 while cooperating with the left connecting member.

[0029] Refer to Figure 2 , 3 , a limiting step 50 is provided in the left sleeve rod 62. The outer end of the bolt body 811 is provided with an abutting step 51 for abutting against the limiting step 50. When one end of the bolt body 811 is locked into the annular sleeve 18, the abutting step 51 abuts against the limiting step 50, which is convenient for tightening the annular sleeve 18 by rotating the bolt body 811.

[0030] Refer to Figure 2 , 3 , a left tapered transition section is provided between the left sleeve ring 61 and the left sleeve rod 62. One end of the left connecting sleeve 4 is threadedly connected to the outer shaft sleeve 3, and the other end is provided with a tapered end adapted to the tapered transition section; a right tapered transition section is provided between the right sleeve ring 71 and the right sleeve rod 72. One end of the right connecting sleeve 5 is threadedly connected to the outer shaft sleeve 3, and the other end is provided with a tapered end adapted to the tapered transition section. In this way, a buffering effect is formed between the left fixing sleeve 6 and the outer shaft sleeve 3, and between the right fixing sleeve 7 and the outer shaft sleeve 3.

[0031] Please refer to Figure 1-8, when assembling the bicycle crank assembly, the outer shaft sleeve 3 is rotatably connected to the middle hole position of the bicycle frame (prior art). Then, the threaded end of the left connecting sleeve 4 is threadedly connected into the outer shaft sleeve 3, and one end of the right connecting sleeve 5 is threadedly connected to the other end of the outer shaft sleeve 3. After that, the left sleeve rod 62 of the left fixing sleeve 6 passes through the inside of the left connecting sleeve 4, and the right sleeve rod 72 of the right fixing sleeve 7 passes through the right connecting sleeve 5, and the engaging teeth 11 of the left sleeve rod 62 and the right sleeve rod 72 are docked. When docking, it is necessary to check the position of the rib grooves 13 on the left collar 61 and the right collar 71 (the positions of the rib grooves 13 need to be symmetrically arranged on both sides of the vertical cross-section of the outer shaft sleeve 3). After the left fixing sleeve 6 and the right fixing sleeve 7 are docked through the engaging teeth 11, the bolt body 811 is inserted into the hollow inside of the left fixing sleeve 6, and one end of the bolt body 811 abuts against the annular sleeve 18. By rotating the inner lining sleeve 812 with an external hexagon wrench, the rotation of the inner lining sleeve 812 drives the rotation of the bolt body 811. The rotation of the bolt body 811 drives the annular sleeve 18 to slide towards one side of the left fixing sleeve 6 through the threaded connection with the annular sleeve 18. When the annular sleeve 18 slides to fit against the inner wall of the annular groove 19 on the side close to the left fixing sleeve 6, the left base column 813 will be inserted into the column hole 40 of the right base column 82, so as to squeeze the first tapered surface 32 of the unlocking lever 30 through the inner wall of the column port 31, driving the L-shaped locking lever 25 to move radially inwards at the inner end of the left base column 813. At the same time, the convex column 39 will be inserted into the column hole 40 of the left base column 813, and the inner wall of the column hole 40 of the left base column 813 will squeeze the second tapered surface 44 of the unlocking block 43, thereby driving the Z-shaped rod 38 to move radially inwards at the inner end of the right base, so that the locking block 54 is disengaged from the locking groove 49, so that the first spring 23 pulls the slider 37 to the initial position, so that the annular sleeve 18 presses tightly against the right sleeve rod 72. Under the action of the abutting of the abutting step 51 of the bolt body 811 and the limiting step 50 of the left sleeve rod 62, the left fixing sleeve 6 and the right fixing sleeve 7 will complete the locking. At this time, continuing to rotate the inner lining sleeve 812 will not drive the rotation of the bolt body 811, avoiding over-locking. Finally, apply AB glue to the outside of the left collar 61 and the right collar 71, and then snap the left crank 1 and the right crank 2 into the left bayonet 9 and the right bayonet 10 respectively to complete the assembly of the bicycle crank assembly (the left crank 1 and the right crank 2 are arranged at 180°).

[0032] When it is necessary to disassemble the bicycle crank assembly for maintenance, only need to reverse the inner lining sleeve 812 through the external hexagon bolt. Under the action of the one-way bearing 55, the rotation of the inner lining sleeve 812 can drive the rotation of the bolt body 811, so as to push the annular sleeve 18 towards the slider 37 again. During the movement of the annular sleeve 18, it will abut against the second inclined surface 47 of the locking block 54 and drive the Z-shaped rod 38 to compress the third spring 41. When the locking block 54 is opposite to the locking groove 49, the third spring 41 will drive the Z-shaped rod 38 to slide outwards, and the locking block 54 will be locked into the locking groove 49 for convenient use in the next installation.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. are based on the orientation or positional relationships in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0034] In the present invention, unless otherwise clearly specified and defined, the terms "mount", "set", "connect", "fix", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that these embodiments can be modified without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A carbon fiber bicycle crank assembly, comprising a left crank (1) and a right crank (2), characterized in that: The left crank (1) and the right crank (2) are connected via a metal connecting component; The metal connection assembly comprises an outer shaft sleeve (3), a left connecting sleeve (4), a right connecting sleeve (5), a left fixed sleeve (6), a right fixed sleeve (7), and an inner bolt locking assembly (8). The inner end of the left crank (1) is provided with a left snap-in opening (9) for one end of the left fixed sleeve (6) to be snap-fitted, and the inner end of the right fixed sleeve (7) is provided with a right snap-in opening (10) for one end of the right fixed sleeve (7) to be snap-fitted. The right connecting sleeve (5) is slidably sleeved on one end of the right fixed sleeve (7) away from the right crank (2), and the other end is threadedly connected to the outer shaft sleeve (3). The ends of the left fixed sleeve (6) and the right fixed sleeve (7) that are close to each other are both provided with engaging teeth (11). After the engaging teeth (11) of the left fixed sleeve (6) and the right fixed sleeve (7) are meshed, the inner bolt locking assembly (8) is used to lock and restrict axial sliding.

2. A carbon fiber bicycle crank assembly according to claim 1, characterized in that: The inner bolt locking assembly (8) comprises an inner bolt locking member (81) and an inner bolt matching member, wherein the inner bolt locking member (81) comprises a bolt body (811), an inner bushing (812) and a left connecting member, wherein the left connecting member limits the relative rotation between the bolt body (811) and the inner bushing (812), wherein the bolt body (811) is hollow, and the inner bushing (812) is rotatably arranged in the hollow interior of the bolt body (811) via a one-way bearing (55), and a hexagonal groove (16) is arranged on a side of the inner bushing (812) away from the bolt matching member; The right fixing sleeve (7) is provided with a central axis groove (17) for the bolt body (811) to be inserted into, an annular sleeve (18) is slidably provided on the inner wall of the right fixing sleeve (7), an external thread (20) is provided on the outer side of the bolt body (811), and an internal thread (21) meshing with the external thread (20) on the bolt body (811) is provided on the circumferential inner wall of the annular sleeve (18), the internal bolt fitting is arranged inside the right fixing sleeve (7), and the internal bolt fitting comprises a right connecting piece, and the right connecting piece and the annular sleeve (18) are connected to each other. An L-shaped rod (22) is connected between the left and right fixing sleeves (6), a first spring (23) is provided in the right fixing sleeve (7) on a side of the L-shaped rod (22) away from the annular sleeve (18), one end of the first spring (23) is fixedly connected to the L-shaped rod (22), and the other end is fixedly connected to the right fixing sleeve (7), the bolt body (811) is threadedly connected to the annular sleeve (18) and after the left fixing sleeve (6) and the right fixing sleeve (7) are engaged, the left connecting piece unlocks the restriction on the bolt body (811) and the inner sleeve (812) by cooperating with the right connecting piece.

3. A carbon fiber bicycle crank assembly according to claim 2, characterized in that: The left connecting member comprises a left base column (813) fixed in the hollow interior of the inner bushing (812), the outer periphery of the left base column (813) being fixed in the inner bushing (812) through a left annular plate (24), an L-shaped locking rod (25) being provided on the left base column (813) for radial sliding, a locking rod groove (26) being provided in the left base column (813) for the wider end of the L-shaped locking rod (25) to slide, a second spring (27) being provided at the bottom end of the locking rod groove (26) for driving the L-shaped locking rod (25) to slide toward the radial outer end of the left base column (813), a through hole (28) being provided on the inner bushing (812), a plug hole (29) being provided on the bolt body (811) for matching with the through hole (28), one end of the long rod of the L-shaped locking rod (25) passing through the left The base column (813), the left annular plate (24), the through hole (28) and the insertion hole (29) are inserted into the insertion hole (29) so that the bolt body (811) and the inner bushing (812) are relatively fixed. An unlocking rod (30) is provided on the outer side of one end of the short rod of the L-shaped locking rod (25). The unlocking rod (30) extends to the radial outer end of the left base column (813). The right connecting member includes a right base column (82). The right base column (82) and the left base column (813) are coaxially arranged. The right base column (82) is provided with a column opening (31) for inserting one end of the left base column (813). After the left fixing sleeve (6) and the right fixing sleeve (7) are engaged, the left base column (813) is inserted into the column opening (31) so that the inner wall of the column opening (31) presses the unlocking rod (30) into the left base column (813).

4. A carbon fiber bicycle crank assembly according to claim 3, characterized in that: A plurality of groups of L-shaped locking rods (25) are arranged along the circumference of the left base column (813), and one end of the unlocking rod (30) located outside the left base column (813) is provided with a first tapered surface (32) that abuts against the opening of the column opening (31).

5. A carbon fiber bicycle crank assembly according to claim 3, characterized in that: The inner wall of the central axis groove (17) is provided with an annular groove (19) for the annular sleeve (18) to slide axially along the right fixed sleeve (7); the circumference of the right base column (82) is slidably arranged in the right fixed sleeve (7) through a right annular plate (33); the outer wall of the right annular plate (33) is fixedly connected to the annular sleeve (18) through an L-shaped rod (22); the inner wall of the central axis groove (17) is provided with a strip groove (34) for the L-shaped rod (22) to slide; the right fixed sleeve (7) is further provided with an inner groove (35) connected to the sliding groove; the first spring (23) is arranged in the inner groove (35).

6. A carbon fiber bicycle crank assembly according to claim 5, characterized in that: An extension rod (36) is provided at one end of the L-shaped rod (22) away from the annular sleeve (18); a slider (37) is slidably provided in the inner groove (35); one end of the first spring (23) is fixed in the inner groove (35) and the other end is fixedly connected to the slider (37); one end of the extension rod (36) extends into the inner groove (35) and forms a sliding connection with the inner groove (35); a Z-shaped rod (38) for connecting the slider (37) is provided in the right base column (82); the Z-shaped rod (38) is radially slidably arranged on the right base column (82); a convex column (39) is provided in the column opening (31); a column hole (40) for the convex column (39) to be inserted into one side of the left base column (813); one end of the Z-shaped rod (38) extends into the convex column (39) and the other ... One end of the Z-shaped rod (38) extends outside the extension rod (36) and is inserted into the slider (37); an unlocking block (43) is provided at one end of the Z-shaped rod (38) located on the convex column (39); a locking block (54) is provided at one end of the Z-shaped rod (38) located on the slider (37); a locking groove (49) for the locking block (54) to engage is provided in the slider (37); after the left fixing sleeve (6) and the right fixing sleeve (7) are engaged, the left base column (813) is inserted into the column opening (31) so that the inner wall of the column hole (40) presses the unlocking block (43) into the convex column (39); after the unlocking block (43) is pressed into the convex column (39), the locking block (54) is disengaged from the locking groove (49) so that the slider (37) returns to its initial position; and a third spring (41) is provided in the convex column (39) for driving the Z-shaped rod (38) to slide toward the radial outer end of the convex column (39) 7. A carbon fiber bicycle crank assembly according to claim 6, characterized in that: The Z-shaped rod (38) comprises a first crossbar (381), a second crossbar (382) and a vertical rod (383); a first crossbar groove (42) for the first crossbar (381) to slide radially is provided in the boss (39); the third spring (41) is fixed to the bottom end of the first crossbar groove (42) and abuts against the first crossbar (381); an unlocking block (43) is fixed to one end of the first crossbar (381) and the outer end extends to the outer end of the boss (39); an end of the unlocking block (43) located outside the boss (39) is provided with a second conical inclined surface (44); a second crossbar groove (45) for the second crossbar (382) to slide is provided in the extension rod (36); a matching groove (46) for the second crossbar (382) to slide is provided in the slider (37); a second inclined surface (47) is provided at one end of the locking block (54); and a vertical rod groove (48) for the vertical rod (383) to slide is provided on the annular plate.

8. The carbon fiber bicycle crank assembly according to claim 2, characterized in that: The left fixing sleeve (6) comprises a left sleeve ring (61) and a left sleeve rod (62); a plurality of ribs (12) are provided on the inner wall of the left bayonet (9); a rib groove (13) cooperating with the ribs (12) is provided on the outer wall of the left sleeve ring (61); and a plurality of groups of left annular sealing grooves (14) are also provided on the left sleeve ring (61); the right fixing sleeve (7) comprises a right sleeve ring (71) and a right sleeve rod (72); a plurality of ribs (12) are provided on the inner wall of the right bayonet (10); a rib groove (13) cooperating with the ribs (12) is provided on the outer wall of the right sleeve ring (71); and a plurality of groups of right annular sealing grooves (15) are also provided on the left sleeve ring (61).

9. A carbon fiber bicycle crank assembly according to claim 8, characterized in that: A limiting step (50) is provided inside the left sleeve rod (62), and an abutting step (51) for abutting against the limiting step (50) is provided at the outer end of the bolt body (811).

10. The carbon fiber bicycle crank assembly according to claim 8, characterized in that: A left conical transition section is provided between the left sleeve ring (61) and the left sleeve rod (62); one end of the left connecting sleeve (4) is threadedly connected to the outer sleeve (3) and the other end is provided with a conical end adapted to the conical transition section; a right conical transition section is provided between the right sleeve ring (71) and the right sleeve rod (72); one end of the right connecting sleeve (5) is threadedly connected to the outer sleeve (3) and the other end is provided with a conical end adapted to the conical transition section.

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