A carbon fiber bicycle crank assembly

Abstract

The present invention discloses a carbon fiber bicycle crank assembly, comprising a left crank and a right crank, wherein the left crank and the right crank are connected by 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, wherein the inner end of the left crank is provided with a left bayonet for clamping one end of the left fixing sleeve, and the inner end of the right fixing sleeve is provided with a right bayonet for clamping one end of the right fixing sleeve, the right connecting sleeve sliding sleeve is arranged 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, and the ends of the left fixing sleeve and the right fixing sleeve that are close to each other are both provided with biting teeth, and after the biting teeth of the left fixing sleeve and the right fixing sleeve are engaged, they are locked and restricted from axial sliding by the inner bolt locking assembly. The present invention can improve the stability of the bicycle crank assembly during use by designing that the left fixing sleeve and the right fixing sleeve are mutually engaged, and by locking the inner and outer threads of the outer shaft sleeve and the inner bolt locking assembly.

Description

Technical Field

[0001] The invention relates to a bicycle crank assembly, in particular to a carbon fiber bicycle crank assembly. Background Art

[0002] Because track bike components require high precision and frequent maintenance to maintain optimal performance, the use and maintenance of each bike is strictly managed within professional teams. Track cyclists often need to transport their dedicated track bikes when training or competing at different training venues.

[0003] The existing bicycle crank assembly includes 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 center hole of the bicycle frame (for installing the pedal position) and a bolt for locking the left crank and the right crank. The bolt locking prevents the left crank and the right crank from axial displacement during use. However, when locking with the bolt, the locking may be too loose or too tight. If the locking is too loose, the crank will become loose when pedaling the bicycle. If the locking is too tight, the thread will be subjected to excessive stress and damage the thread, which will affect subsequent disassembly and maintenance. Summary of the Invention

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

[0005] To achieve the above object, the present invention provides the following technical solution: a carbon fiber bicycle crank assembly, comprising a left crank and a right crank, characterized in that the left crank and the right crank are connected by a metal connecting assembly;

[0006] The metal connection assembly includes an outer shaft sleeve, a left connecting sleeve, a right connecting sleeve, a left fixed sleeve, a right fixed sleeve, and an inner bolt locking assembly. The inner end of the left crank is provided with a left bayonet for one end of the left fixed sleeve to be clamped, and the inner end of the right fixed sleeve is provided with a right bayonet for one end of the right fixed sleeve to be clamped. The right connecting sleeve sliding sleeve is provided at one end of the right fixed sleeve away from the right crank, and the other end is threadedly connected to the outer shaft sleeve. The ends of the left and right fixed sleeves that are close to each other are both provided with engaging teeth. After the engaging teeth of the left and right fixed sleeves are engaged, they are locked and restricted from axial sliding through the inner bolt locking assembly.

[0007] Preferably, the inner bolt locking assembly comprises an inner bolt locking member and an inner bolt matching member, the inner bolt locking member comprises a bolt body, an inner bushing and a left connecting member, the left connecting member restricts the relative rotation between the bolt body and the inner bushing, the bolt body is hollow, the inner bushing is rotatably arranged in the hollow interior of the bolt body through a one-way bearing, and a hexagonal groove is provided on the side of the inner bushing away from the bolt matching member;

[0008] The right fixing sleeve is provided with a central axis groove for the bolt body to be clamped in, and an annular sleeve is slidably provided on the inner wall of the right fixing sleeve, and the outer surface of the bolt body is provided with an external thread, and the circumferential inner 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, and the inner bolt fitting includes a right connecting piece, and an L-shaped rod is connected between the right connecting piece and the annular sleeve. A first spring is provided in the right fixing sleeve on the side of the L-shaped rod away from the annular sleeve, 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 is engaged with the right fixing sleeve, the left connecting piece unlocks the restriction on the bolt body and the inner sleeve by cooperating with the right connecting piece.

[0009] Preferably, the left connecting member includes a left base column fixed to the hollow interior of the inner bushing, the outer periphery of the left base column is fixed to the inner bushing by a left annular plate, an L-shaped locking rod is provided on the left base column along the radial sliding direction, a locking rod groove is provided in the left base column for the sliding of the wider end of the L-shaped locking rod, a second spring is provided at the bottom end of the locking rod groove to drive the L-shaped locking rod to slide toward the radial outer end of the left base column, a through hole is provided on the inner bushing, and a socket is provided on the bolt body to match the through hole, and the length of the L-shaped locking rod is One end of the rod passes through the left base column, the left annular plate, the through hole and is inserted into the socket to relatively fix the bolt body and the inner sleeve. An unlocking rod is provided on the outside of one end of the short rod of the L-shaped locking rod. The unlocking rod extends to the radial outer end of the left base column. The right connecting member includes a right base column, which is coaxially arranged with the left base column. The right base column is provided with a column opening for inserting one end of the left base column. After the left fixing sleeve and the right fixing sleeve are engaged, the left base column is inserted into the column opening so that the inner wall of the column opening presses the unlocking rod into the left base column.

[0010] Preferably, the L-shaped locking rods are provided in multiple groups along the circumference of the left base column, and the end of the unlocking rod located outside the left base column is provided with a first conical inclined surface that abuts against the opening of the column mouth.

[0011] Preferably, an annular groove is provided on the inner wall of the central axis groove for the annular sleeve to slide axially along the right fixed sleeve, the circumference of the right base column is slidably arranged in the right fixed sleeve through the right annular plate, the outer wall of the right annular plate is fixedly connected to the annular sleeve through an L-shaped rod, and a strip groove is provided on the inner wall of the central axis groove for the L-shaped rod to slide, and the right fixed sleeve is also provided with an inner groove connected to the sliding groove, and the first spring is arranged in the inner groove.

[0012] The cam is fixed to the left side of the right side of the frame, and the cam is fixed on the left side of the frame, and the cam is fixed on the right side of the frame, and the cam is fixed on the left side of the frame.

[0013] Preferably, the Z-shaped rod includes a first cross bar, a second cross bar and a vertical rod, a first cross bar groove for the first cross bar to slide radially is provided in the boss, the third spring is fixed to the bottom end of the first cross bar groove and abuts against the first cross bar, the unlocking block is fixed to one end of the first cross bar and the outer end extends to the outer end of the boss, the end of the unlocking block located outside the boss is provided with a second conical surface, the extension rod is provided with a second cross bar groove for the second cross bar to slide, the slider is provided with a matching groove for the second cross bar to slide, one end of the locking block is provided with a second inclined surface, and the annular plate is provided with a vertical rod groove for the vertical rod to slide.

[0014] Preferably, the left fixed sleeve includes a left ring and a left rod, the inner wall of the left bayonet is provided with a plurality of ribs, the outer wall of the left ring is provided with rib grooves cooperating with the ribs, and the left ring is also provided with a plurality of groups of left annular sealing grooves; the right fixed sleeve includes a right ring and a right rod, the inner wall of the right bayonet is provided with a plurality of ribs, the outer wall of the right ring is provided with rib grooves cooperating with the ribs, and the left ring is also provided with a plurality of groups of right annular sealing grooves.

[0015] Preferably, a limiting step is provided inside the left sleeve rod, and an abutting step for abutting against the limiting step is provided at the outer end of the bolt body.

[0016] Preferably, a left conical transition section is provided between the left collar and the left sleeve rod, one end of the left connecting sleeve is threadedly connected to the outer sleeve, 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 collar and the right sleeve rod, one end of the right connecting sleeve is threadedly connected to the outer sleeve, and the other end is provided with a conical end adapted to the conical transition section.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The stability of the bicycle crank assembly during use can be improved by locking the inner and outer threads of the outer sleeve and the inner bolt locking assembly;

[0019] The inner bolt locking member includes a bolt body, an inner bushing and a left connecting member. An annular sleeve is slidably provided on the inner wall of the right fixing sleeve. The outer surface of the bolt body is provided with an external thread. The circumferential inner wall of the annular sleeve is provided with an internal thread meshing with the external thread on the bolt body. After the bolt body is threadedly connected with the annular sleeve and the left fixing sleeve and the right fixing sleeve are engaged, the left connecting member unlocks the restriction on the bolt body and the inner bushing by cooperating with the right connecting member. After the bolt body locks the annular sleeve and presses the annular sleeve against the inner wall of the annular groove, the inner bushing continues to rotate and cannot drive the bolt body to rotate, thereby preventing the bolt from being too tight or too loose on the right fixing sleeve, so that the overall strength of the crank assembly is guaranteed to be stable and convenient for subsequent disassembly and maintenance.

[0020] By arranging the L-shaped rod and the second spring, the bolt body locks the annular sleeve and the annular sleeve presses the inner wall of the annular groove, which requires overcoming the tension of the second spring. 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 the inner wall of the annular groove, the second spring is separated from the L-shaped rod, so that the annular sleeve presses the inner wall of the annular groove, which requires overcoming the tension of the second spring, is converted into the force of the annular sleeve pressing the annular groove, so that the force of the bolt body locking the annular sleeve is at an appropriate size. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0023] Figure 2 It is an exploded schematic diagram of the overall structure of the present invention;

[0024] Figure 3 It is a cross-sectional schematic diagram of the present invention as a whole;

[0025] Figure 4 is a cross-sectional schematic diagram highlighting the inner walls of the left fixing sleeve and the right fixing sleeve of the present invention;

[0026] Figure 5 yes Figure 4 A magnified schematic diagram of part A;

[0027] Figure 6 This is a structural diagram of the present invention highlighting the left base column;

[0028] Figure 7 This is a structural diagram of the present invention highlighting the right base column;

[0029] Figure 8 It is an exploded schematic diagram highlighting the right base column and the slider of the present invention.

[0030] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0031] 1. Left crank; 2. Right crank; 3. Outer 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 sleeve; 813. Left base column; 82. Right base column; 9. Left bayonet; 10. Right bayonet; 11. Engaging teeth; 12. Rib; 13. Rib groove; 14. Left annular sealing groove; 15. Right annular sealing groove; 16. Hexagonal groove; 17. Center 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 lock Rod; 26, locking rod groove; 27, second spring; 28, through hole; 29, jack; 30, unlocking rod; 31, column mouth; 32, first conical inclined surface; 33, right annular plate; 34, strip groove; 35, inner groove; 36, extension rod; 37, slider; 38, Z-shaped rod; 381, first cross bar; 382, ​​second cross bar; 383, vertical rod; 39, boss; 40, column hole; 41, third spring; 42, first cross bar groove; 43, unlocking block; 44, second conical inclined surface; 45, second cross bar groove; 46, matching groove; 47, second inclined surface; 48, vertical rod groove; 49, lock 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 DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] See also Figure 1-8 , the present invention provides a technical solution:

[0034] See Figure 1 A carbon fiber bicycle crank assembly comprises a left crank 1 and a right crank 2, wherein the left crank 1 and the right crank 2 are connected by a metal connecting assembly;

[0035] See Figure 2 、 3 The metal connection assembly includes an outer 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 bayonet 9 for clamping one end of the left fixed sleeve 6, and the inner end of the right fixed sleeve 7 is provided with a right bayonet 10 for clamping one end of the right fixed sleeve 7. The right connecting sleeve 5 is slidingly sleeved on the end of the right fixed sleeve 7 away from the right crank 2, and the other end is threadedly connected to the outer sleeve 3. The ends of the left and right fixed sleeves 6 and 7 close to each other are both provided with engaging teeth 11. After the engaging teeth 11 of the left and right fixed sleeves 6 are engaged, they are locked and restricted by the inner bolt locking assembly 8 to limit axial sliding. Among them, the left fixed sleeve 6 is clamped into the left bayonet 9 and fixed to the left crank 1 by coating AB glue on the surface, and the right fixed sleeve 7 is clamped into the right bayonet 10 and fixed to the right crank 2 by coating AB glue on the surface.

[0036] In order to increase the connection strength between the left connecting sleeve and the left crank 1, the left fixed sleeve 6 includes a left ring 61 and a left sleeve rod 62, a plurality of ribs 12 are provided on the inner wall of the left bayonet 9, and a rib groove 13 is provided on the outer wall of the left ring 61 to cooperate with the rib 12. The left ring 61 is also provided with multiple groups of left annular sealing grooves 14, which can also increase the bonding effect when fixed by AB glue; in order to increase the connection strength between the right connecting sleeve and the right crank 2, the right fixed sleeve 7 includes a right ring 71 and a right sleeve rod 72, a plurality of ribs 12 are provided on the inner wall of the right bayonet 10, and a rib groove 13 is provided on the outer wall of the right ring 71 to cooperate with the rib 12. The left ring 61 is also provided with multiple groups of right annular sealing grooves 15, which can also increase the bonding effect when fixed by AB glue.

[0037] See Figure 2 、 4-8, the inner bolt locking assembly 8 includes an inner bolt locking part 81 and an inner bolt matching part. The inner bolt locking part 81 includes a bolt body 811, an inner bushing 812 and a left connecting part. The left connecting part limits the relative rotation between the bolt body 811 and the inner bushing 812. The bolt body 811 is hollow. The inner bushing 812 is rotatably arranged in the hollow interior of the bolt body 811 through a one-way bearing 55. The inner bushing 812 is provided with an inner hexagonal groove 16 on the side away from the bolt matching part; the right fixed sleeve 7 is provided with a central axis groove 17 for the bolt body 811 to be clamped, and the inner wall of the right fixed sleeve 7 is provided with a There is an annular sleeve 18, and an annular groove 19 is provided on the inner wall of the central axis groove 17 for the annular sleeve 18 to slide axially along the right fixed sleeve 7. The outside of the bolt body 811 is provided with an external thread 20, and the circumferential inner wall of the annular sleeve 18 is provided with an internal thread 21 that engages with the external thread 20 on the bolt body 811. In the initial state, the bolt body 811 is driven to rotate by rotating the inner sleeve 812, and the bolt body 811 rotates and drives the threaded sleeve to move toward the side of the left fixed sleeve 6 through the thread cooperation with the annular sleeve 18. When the annular sleeve 18 moves to a position that is in contact with one side wall of the annular groove 19, it is the final locking position.

[0038] The inner bolt fitting is arranged inside the right fixing sleeve 7, and the inner bolt fitting includes a right connecting piece. An L-shaped rod 22 is connected between the right connecting piece and the annular sleeve 18. A first spring 23 is provided in the right fixing sleeve 7 on the 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. 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 sleeve 812 by cooperating with the right connecting piece. The bolt body 811 and the inner 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-tightened, and the thread can be protected under the premise of ensuring the locking strength of the bolt body 811 and the annular sleeve 18, which is beneficial to the subsequent disassembly and maintenance of the bicycle crank assembly.

[0039] See Figure 2 、 4-8, the left connecting member includes a left base column 813 fixed to the hollow interior of the inner sleeve 812, the outer periphery of the left base column 813 is fixed to the inner sleeve 812 through the left annular plate 24, an L-shaped locking rod 25 is provided on the left base column 813 along the radial sliding direction, a locking rod groove 26 is provided in the left base column 813 for the wider end of the L-shaped locking rod 25 to slide, a second spring 27 is provided at the bottom end of the locking rod groove 26 to drive the L-shaped locking rod 25 to slide toward the radial outer end of the left base column 813, a through hole 28 is provided on the inner sleeve 812, and a socket 29 is provided on the bolt body 811 to match the through hole 28, one end of the long rod 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 socket 29 so that the bolt body 811 and the inner sleeve 812 are relatively fixed, and 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, and the right connecting part includes a right base column 82, which is coaxially arranged with the left base column 813. 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. After being locked and attached to the left fixing sleeve 6 and the right fixing sleeve 7 by the bolt body 811 and the annular sleeve 18, the unlocking rod 30 is squeezed and slid under the action of the inner wall of the column opening 31, so that one end of the unlocking rod 30 disengages from the socket 29, so that when the inner sleeve 812 continues to rotate, the bolt body 811 cannot be driven to rotate, thereby avoiding excessive engagement of the external thread 20 of the bolt body 811 with the internal thread 21 of the annular sleeve 18 to cause excessive stress.

[0040] See Figure 4 、 6 Multiple groups of L-shaped locking rods 25 are arranged along the circumference of the left base column 813, and the end of the unlocking rod 30 located outside the left base column 813 is provided with a first conical inclined surface 32 that abuts against the opening of the column opening 31. By setting the first conical inclined surface 32, when the left base column 813 enters the column opening 31, the inner wall of the column opening 31 can more easily squeeze the unlocking rod 30.

[0041] See Figure 4 The circumference of the right base column 82 is slidably set in the right fixed sleeve 7 through the right annular plate 33, wherein the outer wall of the right annular plate 33 is fitted with the inner wall of the central axis groove 17, so that the right base column 82 is more stable when sliding along the axial direction 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. The inner wall of the central axis groove 17 is provided with a strip groove 34 for sliding the L-shaped rod 22. The right fixed sleeve 7 is also provided with an inner groove 35 connected to the sliding groove, and the first spring 23 is arranged in the inner groove 35.

[0042] See Figure 4 、 5, 7, 8, in order to make the L-shaped rod 22 lose the tension of the first spring 23 after the bolt body 811 locks the annular sleeve 18, so that the tension of the first spring 23 is converted into the pressure of the annular sleeve 18 on the inner wall of the annular groove 19 (the force required for the deformation of the first spring 23 until the annular sleeve 18 fits the inner wall of the annular groove 19 close to the left fixed 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 the end of the L-shaped rod 22 away from the annular sleeve 18, and a slider is provided to slide in the inner groove 35 37, 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, and the Z-shaped rod 38 is radially slidably provided on the right base column 82, a boss 39 is provided in the column opening 31, and a column hole 40 for the boss 39 to be inserted into one side of the left base column 813 is provided, one end of the Z-shaped rod 38 extends into the boss 39, and the other end extends to the extension rod 36 and inserted into the slider 37, the Z-shaped rod 38 is provided with an unlocking block 43 at one end of the boss 39, and the Z-shaped rod 38 is provided with a locking block 54 at one end of 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 boss 39. After the unlocking block 43 is pressed into the boss 39, the locking block 54 is disengaged from the locking groove 49 to restore the slider 37 to its initial position. The third spring 41 drives the Z-shaped rod 38 to slide toward the radial outer end of the boss 39. After the boss 39 enters the column hole 40, the Z-shaped rod 38 slides to disengage the locking block 54 from the locking groove 49, and the first spring 23 pulls the slider 37 to restore to its initial position, thereby converting all the force of the first spring 23 into pressure of the annular sleeve 18 on the inner wall of one side of the annular groove 19, while preventing the slider 37 from continuously generating tension on the annular sleeve 18 through the L-shaped rod 22, thereby protecting the threads of the annular sleeve 18 and the bolt body 811.

[0043] See Figure 4 、 5, 7, 8, the Z-shaped rod 38 includes a first crossbar 381, a second crossbar 382 and a vertical rod 383. A first crossbar groove 42 is provided in the boss 39 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 the outer end extends to the outer end of the boss 39. The end of the unlocking block 43 outside the boss 39 is provided with a second tapered surface 44. The extension rod 36 is provided with a second crossbar for the second crossbar The second cross bar groove 45 for sliding 382, ​​a matching groove 46 for the sliding of the second cross bar 382 is provided in the slider 37, one end of the locking block 54 is provided with a second inclined surface 47, and a vertical rod groove 48 for the sliding of the vertical rod 383 is provided on the annular plate, the Z-shaped rod 38 slides radially along the right base column 82, and the two ends of the Z-shaped rod 38 are provided with the second inclined surface 47 and the second conical inclined surface 44, which can cooperate with the left connecting piece to realize that the L-shaped locking rod 25 is disengaged from the socket 29 and the locking block 54 is disengaged from the lock groove 49 in the slider 37 at the same time.

[0044] See Figure 2 、 3 A limiting step 50 is provided inside the left sleeve rod 62, and an abutting step 51 is provided at the outer end of the bolt body 811 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, making it convenient to tighten the annular sleeve 18 by rotating the bolt body 811.

[0045] See Figure 2 、 3 A left conical transition section is provided between the left collar 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 collar 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. In this way, a buffering effect is formed between the left fixed sleeve 6 and the outer sleeve 3, and between the right fixed sleeve 7 and the outer sleeve 3.

[0046] See also Figure 1-8When assembling the bicycle crank assembly, the outer sleeve 3 is rotatably connected to the center hole position of the bicycle frame (existing technology), and then the threaded end of the left connecting sleeve 4 is threadedly connected to the outer sleeve 3, and one end of the right connecting sleeve 5 is threadedly connected to the other end of the outer sleeve 3. Then, the left sleeve rod 62 of the left fixed sleeve 6 passes through the inside of the left connecting sleeve 4, and the right sleeve rod 72 of the right fixed sleeve 7 passes through the right connecting sleeve 5, and 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 groove 13 on the left ring 61 and the right ring 71 (rib groove 13 position The arrangement needs to be symmetrically arranged on both sides of the vertical 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 used to penetrate the hollow interior of the left fixing sleeve 6, and one end of the bolt body 811 is abutted against the annular sleeve 18. The inner sleeve 812 is rotated by the external hexagonal wrench. The rotation of the inner sleeve 812 drives the bolt body 811 to rotate. The rotation of the bolt body 811 drives the annular sleeve 18 to slide toward one side of the left fixing sleeve 6 through the threaded connection with the annular sleeve 18. When the annular sleeve 18 slides to the annular groove 19 close to the left fixing sleeve 6, the bolt body 811 is rotated. When the inner wall of one side of the left base column 813 is in contact with the left base column 82, the left base column 813 will be stuck in the column hole 40 of the right base column 82, thereby squeezing the first tapered surface 32 of the unlocking rod 30 through the inner wall of the column opening 31, driving the L-shaped locking rod 25 to move along the radial inner end of the left base column 813. At the same time, the protruding column 39 will be stuck in 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 along the radial inner end of the right base to allow the locking block 54 to disengage from the lock groove 49, so that the first spring 23 pulls the slider 37 to the initial position, from The annular sleeve 18 presses the right sleeve rod 72, and the left fixing sleeve 6 and the right fixing sleeve 7 are locked together under the action of the abutting step 51 of the bolt body 811 and the limiting step 50 of the left sleeve rod 62. At this time, continuing to rotate the inner sleeve 812 will not drive the bolt body 811 to rotate, avoiding excessive locking. Finally, AB glue is applied to the outside of the left sleeve 61 and the right sleeve 71, and the left crank 1 and the right crank 2 are respectively inserted through the left bayonet 9 and the right bayonet 10 to complete the assembly of the bicycle crank assembly (the left crank 1 and the right crank 2 are set at 180 degrees).

[0047] When the bicycle crank assembly needs to be disassembled for maintenance, it is only necessary to reverse the inner sleeve 812 through the external hexagonal bolt. Under the action of the one-way bearing 55, the bolt body 811 can be driven to rotate, thereby pushing the annular sleeve 18 toward the side of 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 outward and lock the locking block 54 into the locking groove 49, which is convenient for next installation and use.

[0048] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the accompanying drawings, and 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, and therefore should not be understood as limiting the present invention.

[0049] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which 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 assembly; 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 bayonet (9) for clamping one end of the left fixed sleeve (6), and the inner end of the right fixed sleeve (7) is provided with a right bayonet (10) for clamping one end of the right fixed sleeve (7). 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 engaged, the axial sliding is restricted by locking through the inner bolt locking assembly (8); The inner bolt locking assembly (8) includes an inner bolt locking member (81) and an inner bolt matching member. The inner bolt locking member (81) includes a bolt body (811), an inner sleeve (812) and a left connecting member. The left connecting member limits the relative rotation between the bolt body (811) and the inner sleeve (812). The bolt body (811) is hollow. The inner sleeve (812) is rotatably arranged in the hollow interior of the bolt body (811) through a one-way bearing (55). A hexagonal groove (16) is provided on a side of the inner sleeve (812) away from the inner 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, and an annular sleeve (18) is slidably provided on the inner wall of the right fixing sleeve (7). The outer surface of the bolt body (811) is provided with an external thread (20), and the 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). The inner bolt fitting is provided inside the right fixing sleeve (7), and the inner bolt fitting includes a right connecting piece, and the right connecting piece and the annular sleeve (18) are connected. An L-shaped rod (22) is connected between the left and right fixing sleeves (6), and 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). 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, the left connecting member unlocks the restriction on the bolt body (811) and the inner sleeve (812) by cooperating with the right connecting member. The left connecting member includes a left base column (813) fixed in the hollow interior of the inner sleeve (812), the outer periphery of the left base column (813) is fixed in the inner sleeve (812) through a left annular plate (24), an L-shaped locking rod (25) is provided on the left base column (813) for radial sliding, a locking rod groove (26) is provided in the left base column (813) for the wider end of the L-shaped locking rod (25) to slide, a second spring (27) is 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) is provided on the inner sleeve (812), a socket (29) matched with the through hole (28) is provided on the bolt body (811), and one end of the long rod of the L-shaped locking rod (25) passes 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 bolt body (811) and the inner sleeve (812) so as to be 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).

2. A carbon fiber bicycle crank assembly according to claim 1, characterized in that: The L-shaped locking rods (25) are arranged in multiple groups along the circumference of the left base column (813), and the unlocking rod (30) is provided with a first tapered surface (32) at one end outside the left base column (813) that abuts against the opening of the column opening (31).

3. The carbon fiber bicycle crank assembly according to claim 1, 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 the right annular plate (33). The outer wall of the right annular plate (33) is fixedly connected to the annular sleeve (18) through the 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 also provided with an inner groove (35) connected to the sliding groove. The first spring (23) is arranged in the inner groove (35).

4. A carbon fiber bicycle crank assembly according to claim 3, characterized in that: An extension rod (36) is provided at one end of the L-shaped rod (22) away from the annular sleeve (18), and a slider (37) is 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 boss (39) is provided in the column opening (31). A column hole (40) for the boss (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 boss (39) and the other end extends into the boss (39). One end extends to the outside of the extension rod (36) and is inserted into the slider (37). The Z-shaped rod (38) is provided with an unlocking block (43) at one end of the boss (39). The Z-shaped rod (38) is provided with a locking block (54) at one end of the slider (37). A locking groove (49) for the locking block (54) to be engaged 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 boss (39). After the unlocking block (43) is pressed into the boss (39), the locking block (54) is disengaged from the locking groove (49) so that the slider (37) returns to its initial position. A third spring (41) is provided in the boss (39) for driving the Z-shaped rod (38) to slide toward the radial outer end of the boss (39).

5. The carbon fiber bicycle crank assembly according to claim 4, characterized in that: The Z-shaped rod (38) includes a first crossbar (381), a second crossbar (382) and a vertical rod (383). The boss (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 the outer end extends to the outer end of the boss (39). The end of the unlocking block (43) located outside the boss (39) is provided with a second conical inclined surface (44). 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 matching 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 right annular plate is provided with a vertical rod groove (48) for the vertical rod (383) to slide.

6. The carbon fiber bicycle crank assembly according to claim 1, characterized in that: The left fixed 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 a plurality of ribs (12), the outer wall of the left sleeve ring (61) is provided with a rib groove (13) that cooperates with the ribs (12), and the left sleeve ring (61) is also provided with a plurality of groups of left annular sealing grooves (14); the right fixed 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 a plurality of ribs (12), the outer wall of the right sleeve ring (71) is provided with a rib groove (13) that cooperates with the ribs (12), and the left sleeve ring (61) is also provided with a plurality of groups of right annular sealing grooves (15).

7. The carbon fiber bicycle crank assembly according to claim 6, 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).

8. The carbon fiber bicycle crank assembly according to claim 6, characterized in that: A left conical transition section is provided between the left collar (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 collar (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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