Bicycle crank transmission mechanism

Abstract

The bicycle crank transmission mechanism relates to the technical field of crank transmission and comprises a crank spindle, a movable groove is formed in the outer surface of the front side of the crank spindle, a pressing chamber is arranged on the outer surface of the left side of the crank spindle, a connecting shaft is arranged on the rear side of the crank spindle, and inner gear rings are arranged on the peripheries of the two sides of the connecting shaft. A chain wheel is arranged on the periphery of each set of inner gear ring, an outer gear ring is arranged on the inner surface of each set of chain wheel, each set of outer gear ring is meshed with the corresponding inner gear ring, four sets of fixing holes are formed in the outer surfaces of the sides, close to each other, of the two sets of chain wheels, and two sets of dustproof sleeves are correspondingly arranged on the periphery of the connecting shaft. Four sets of fixing holes are formed in the outer surfaces of the sides, close to each other, of each set of dustproof sleeves, a first fixing base is arranged on the inner wall of the pressing chamber, dust and dirt can be prevented from being accumulated on the transmission mechanism through cooperation of the structures, and the riding requirements of different riders are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of crank drive, and particularly relates to a bicycle crank drive mechanism. Background Art

[0002] The bicycle crank drive mechanism is the core component of the bicycle drive system. The rider pedals the pedal to make the crank rotate. The rotation of the crank drives the sprocket to rotate, and this power is transmitted to the flywheel on the rear axle through a chain. The flywheel then drives the rear wheel to rotate, thereby pushing the bicycle forward. The design of this drive mechanism cleverly converts the rider's force into the driving force of the wheel, enabling the bicycle to travel efficiently and stably. The performance of the crank drive mechanism directly affects the riding experience and efficiency of the bicycle.

[0003] During the implementation of this application, it is found that there are the following problems in this technology: The existing crank drive mechanism does not have a dust-proof component, and it is easy to accumulate dust and dirt during the transmission process, increasing friction and affecting the transmission efficiency. At the same time, the length of the crank arm cannot be adjusted, and it cannot meet the needs of different riders.

[0004] Therefore, a bicycle crank drive mechanism is proposed. Content of the Utility Model

[0005] The purpose of the utility model is: In order to prevent the drive mechanism from accumulating dust and dirt, meet the riding needs of different riders, and effectively position and control the workpiece, this application provides a bicycle crank drive mechanism.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A bicycle crank drive mechanism includes a crank main shaft. An activity groove is provided on the outer surface of the front side of the crank main shaft. A pressing chamber is provided on the outer surface of the left side of the crank main shaft. A connecting shaft is provided at the rear side of the crank main shaft. Inner gear rings are provided on the outer periphery of both sides of the connecting shaft. A sprocket is provided on the outer periphery of each group of inner gear rings. An outer gear ring is provided on the inner surface of each group of sprockets, and each group of outer gear rings meshes with the corresponding inner gear ring.

[0008] Four fixing holes are provided on the outer surface of the side where the two groups of sprockets are close to each other. Two dust-proof sleeves are correspondingly provided on the outer periphery of the connecting shaft. Four fixing holes are provided on the outer surface of the side where each group of dust-proof sleeves are close to each other. A fixing nut is rotatably connected between each pair of fixing holes. A pressing chamber is provided on the outer surface of the left side of the crank main shaft. A first fixing seat is provided on the inner wall of the pressing chamber.

[0009] Further, a pressing rod is slidably connected between the first fixing seats. A second fixing seat is arranged on the outer periphery of one side of the pressing rod away from the first fixing seats. A spring is arranged around the pressing rod, and two ends of the spring are respectively arranged on the outer surfaces of the second fixing seat and the first fixing seat.

[0010] Further, a limiting bump is arranged at the end of the other side of the pressing rod. A sliding groove is arranged on the inner surface of one side of the crank main shaft away from the pressing rod. An active rod is arranged inside the crank main shaft. A sliding bump is arranged on the outer surface of one side of the active rod close to the sliding groove. The outer surface of the sliding bump is slidably connected with the inner surface of the sliding groove.

[0011] Further, a plurality of groups of limiting grooves are arranged on the outer surface of the active rod away from the sliding groove, and the plurality of groups of limiting grooves are in limiting clamping connection with the limiting bump.

[0012] Further, a crank arm is vertically arranged on the outer surface of the active rod. A first limiting ring is arranged at the end of the other side of the crank arm. A pedal is arranged around the crank arm. A rotating limiting sleeve is arranged on the inner surface of one side of the pedal away from the crank main shaft.

[0013] Further, a limiting rod is arranged between the outer surface of the rotating limiting sleeve and the inner surface of the pedal. A limiting ring is arranged inside the rotating limiting sleeve. The first limiting ring is in limiting clamping connection with the inner surface of the limiting ring. A rotating pad is arranged on the inner surface of one side of the pedal away from the limiting ring.

[0014] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0015] 1. In the present utility model, when it is necessary to drive the crank transmission mechanism, by pulling the pressing rod, the second fixing seat around it drives the spring to compress, so as to gradually release the position limitation between the limiting bump and the corresponding limiting groove, pulling the crank arm to move the active rod connected thereto. When the active rod moves, the outer surface of the sliding bump slides between the inner surfaces of the sliding grooves, ensuring the stability of the operation and preventing the active rod from falling off. After adjusting to a length suitable for the rider to ride, release the corresponding pressing rod, and the spring drives the corresponding second fixing seat to rebound, so that the limiting bump forms a position limitation with a new group of limiting grooves.

[0016] 2. In this utility model, the rider pedals the pedal, causing the first limiting ring to rotate stably within the rotating limiting sleeve. The pedal can move following the movement of the rider's foot. The rotating pad is arranged between the crank arm and the pedal, effectively buffering the friction during cycling and extending the service life. The crank arm generates a rotational motion to drive the crank main shaft to rotate. The rotation of the crank main shaft drives the corresponding internal gear ring to rotate. Since the outer surface of the internal gear ring meshes with the inner surface of the external gear ring, the rotation of the internal gear ring can drive the corresponding sprocket to rotate, thereby enabling the subsequent transmission system to move and achieving the purpose of driving the bicycle. The dust cover is fixed by the fixing nut to prevent the transmission mechanism from accumulating dust and dirt. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the whole of this utility model;

[0018] Figure 2 is a schematic structural diagram of the transmission component of this utility model;

[0019] Figure 3 is a schematic structural diagram of the pedal assembly of this utility model;

[0020] Figure 4 is a cross-sectional view of the internal structure of the clamping component of this utility model;

[0021] Figure 5 is a schematic structural diagram of the rotation mode of the crank arm of this utility model.

[0022] In the figure: 1 - crank main shaft; 2 - movable groove; 3 - pressing rod; 4 - connecting shaft; 5 - sliding convex block; 6 - crank arm; 7 - pedal; 8 - dust cover; 9 - sprocket; 10 - fixing nut; 11 - fixing hole; 12 - external gear ring; 13 - internal gear ring; 14 - first limiting ring; 15 - rotating pad; 16 - rotating limiting sleeve; 17 - limiting rod; 18 - limiting groove; 19 - second fixing seat; 20 - pressing chamber; 21 - first fixing seat; 22 - spring; 23 - movable rod; 24 - limiting convex block; 25 - sliding groove; 26 - limiting ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Apparently, the described embodiments are some, but not all, of the embodiments of this utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this utility model without making creative efforts fall within the scope of protection of this utility model. Embodiment

[0024] Refer to Figures 1-5, a bicycle crank drive mechanism, including a crank main shaft 1. An activity groove 2 is provided on the outer surface of the front side of the crank main shaft 1. A pressing chamber 20 is provided on the outer surface of the left side of the crank main shaft 1. A connecting shaft 4 is provided at the rear side of the crank main shaft 1. Inner gear rings 13 are provided on the outer periphery of both sides of the connecting shaft 4. A sprocket 9 is provided on the outer periphery of each group of inner gear rings 13. Outer gear rings 12 are provided on the inner surface of each group of sprockets 9. And each group of outer gear rings 12 meshes with the corresponding inner gear ring 13. Four fixing holes 11 are provided on the outer surface of one side where the two sprockets 9 are close to each other. Two dust covers 8 are correspondingly provided on the outer periphery of the connecting shaft 4. And four fixing holes 11 are provided on the outer surface of one side where each group of dust covers 8 are close to each other. And a fixing nut 10 is rotatably connected between each pair of fixing holes 11. A pressing chamber 20 is provided on the outer surface of the left side of the crank main shaft 1. A first fixing seat 21 is provided on the inner wall of the pressing chamber 20. Specifically, through the cooperation of the above structures, dust and dirt accumulation in the drive mechanism can be prevented, and the riding needs of different riders can be adapted.

[0025] Refer to Figures 1-5 , a pressing rod 3 is slidably connected between the first fixing seats 21. A second fixing seat 19 is provided on the outer periphery of one side of the pressing rod 3 away from the first fixing seat 21. A spring 22 is provided around the outer periphery of the pressing rod 3. And both ends of the spring 22 are respectively provided on the outer surfaces of the second fixing seat 19 and the first fixing seat 21. Specifically, by pulling the pressing rod 3, the second fixing seat 19 on its outer periphery drives the spring 22 to be compressed, thereby gradually releasing the position restriction between the limiting convex block 24 and the corresponding limiting groove 18. A limiting convex block 24 is provided at the other end of the pressing rod 3. A sliding groove 25 is provided on the inner surface of one side of the crank main shaft 1 away from the pressing rod 3. An activity rod 23 is provided inside the crank main shaft 1. And a sliding convex block 5 is provided on the outer surface of one side of the activity rod 23 close to the sliding groove 25. The outer surface of the sliding convex block 5 is slidably connected with the inner surface of the sliding groove 25. Specifically, by pulling the crank arm 6 to move the activity rod 23 connected thereto, when the activity rod 23 moves, the outer surface of the sliding convex block 5 slides between the inner surfaces of the sliding groove 25, ensuring the stability of the operation.

[0026] Refer to Figures 1-5, a plurality of groups of limiting grooves 18 are provided on the outer surface of the movable rod 23 away from the sliding groove 25, and the plurality of groups of limiting grooves 18 are in limiting clamping connection with the limiting bumps 24. Specifically, a crank arm 6 is vertically provided on the outer surface of the movable rod 23. A first limiting ring 14 is provided at the other end of the crank arm 6. A pedal 7 is provided around the crank arm 6. A rotating limiting sleeve 16 is provided on the inner surface of the pedal 7 away from the crank main shaft 1. Specifically, when the corresponding pressing rod 3 is released, the spring 22 drives the corresponding second fixing seat 19 to rebound, so that the limiting bump 24 forms a position limit with a new group of limiting grooves 18.

[0027] Refer to Figures 1-5 , a limiting rod 17 is provided between the outer surface of the rotating limiting sleeve 16 and the inner surface of the pedal 7. A limiting ring 16 is provided inside the rotating limiting sleeve 16. The first limiting ring 14 is in limiting clamping connection with the inner surface of the limiting ring 16. A rotating pad 15 is provided on the inner surface of the pedal 7 away from the limiting ring 16. Specifically, when the rider steps on the pedal 7, since the first limiting ring 14 can rotate stably in the rotating limiting sleeve 16, the pedal 7 can move following the movement of the rider's foot sole. The rotating pad 15 is provided between the crank arm 6 and the pedal 7 to effectively buffer the friction during riding and improve the service life.

[0028] The implementation principle of the embodiment of a bicycle crank drive mechanism of this application is as follows:

[0029] When it is necessary to drive the crank drive mechanism, by pulling the pressing rod 3, the second fixing seat 19 on its periphery drives the spring 22 to compress, so as to gradually release the position limit between the limiting bump 24 and the corresponding limiting groove 18. Pull the crank arm 6 to move the movable rod 23 connected thereto. When the movable rod 23 moves, the outer surface of the sliding bump 5 slides between the inner surfaces of the sliding groove 25 to ensure the stability of the operation and prevent the movable rod 23 from falling off. When it is adjusted to a length suitable for the rider to ride, release the corresponding pressing rod 3, and the spring 22 drives the corresponding second fixing seat 19 to rebound, so that the limiting bump 24 forms a position limit with a new group of limiting grooves 18.

[0030] On the other hand, the rider pedals the pedal 7, enabling the first limit ring 14 to rotate stably within the rotating limit sleeve 16, and the pedal 7 can move following the movement of the rider's foot. The rotating pad 15 is arranged between the crank arm 6 and the pedal 7 to effectively buffer the friction during cycling and improve the service life. The rotation of the crank arm 6 generates a rotational motion to drive the crank main shaft 1 to rotate. The rotation of the crank main shaft 1 drives the corresponding internal gear ring 13 to rotate. Since the outer surface of the internal gear ring 13 meshes with the inner surface of the external gear ring, the rotation of the internal gear ring 13 can drive the corresponding sprocket 9 to rotate, thereby enabling the subsequent transmission system to move and achieving the purpose of driving the bicycle. The dust cover 8 is fixed by the fixing nut 10 to prevent the transmission mechanism from accumulating dust and dirt.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A bicycle crank transmission mechanism, comprising a crank spindle (1), characterized in that: The front outer surface of the crankshaft (1) is provided with a movable groove (2), the left outer surface of the crankshaft (1) is provided with a pressing chamber (20), the rear side of the crankshaft (1) is provided with a connecting shaft (4), the outer peripheries of both sides of the connecting shaft (4) are provided with inner gear rings (13), the outer periphery of each group of the inner gear rings (13) is provided with a sprocket (9), the inner surface of each group of the sprocket (9) is provided with an outer gear ring (12), and each group of the outer gear rings (12) is meshed with the corresponding inner gear ring (13); Four groups of fixing holes (11) are provided on the outer surfaces of the two groups of sprockets (9) on the sides close to each other, two groups of dust covers (8) are correspondingly provided on the periphery of the connecting shaft (4), and four groups of fixing holes (11) are provided on the outer surfaces of the two groups of dust covers (8) on the sides close to each other, and a fixing nut (10) is rotatably connected between each pair of the fixing holes (11), and a pressing chamber (20) is provided on the left outer surface of the crank spindle (1), and a first fixing seat (21) is provided on the inner wall of the pressing chamber (20).

2. A bicycle crank transmission mechanism according to claim 1, characterized in that: A pressing rod (3) is slidably connected between the first fixing seats (21); a second fixing seat (19) is arranged on the periphery of the pressing rod (3) away from the first fixing seat (21); a spring (22) is arranged around the periphery of the pressing rod (3), and two ends of the spring (22) are respectively arranged on the outer surfaces of the second fixing seat (19) and the first fixing seat (21).

3. A bicycle crank transmission mechanism as claimed in claim 2, characterized in that: A limiting protrusion (24) is provided at the other end of the pressing rod (3); a sliding groove (25) is provided on the inner surface of the crank spindle (1) away from the pressing rod (3); a movable rod (23) is provided inside the crank spindle (1); and a sliding protrusion (5) is provided on the outer surface of the movable rod (23) close to the sliding groove (25); the outer surface of the sliding protrusion (5) is slidably connected to the inner surface of the sliding groove (25).

4. A bicycle crank transmission mechanism as claimed in claim 3, characterized in that: A plurality of groups of limiting grooves (18) are provided on the outer surface of one side of the movable rod (23) away from the sliding groove (25), and the plurality of groups of limiting grooves (18) are limitedly engaged with the limiting protrusions (24).

5. A bicycle crank transmission mechanism as claimed in claim 4, characterized in that: A crank arm (6) is vertically arranged on the outer surface of the movable rod (23); a first limiting ring (14) is arranged at the other end of the crank arm (6); a pedal (7) is arranged on the outer periphery of the crank arm (6); and a rotation limiting sleeve (16) is arranged on the inner surface of the pedal (7) away from the crank spindle (1).

6. A bicycle crank transmission mechanism as claimed in claim 5, characterized in that: A limiting rod (17) is arranged between the outer surface of the rotation limiting sleeve (16) and the inner surface of the pedal (7); a limiting ring (26) is arranged inside the rotation limiting sleeve (16); the first limiting ring (14) is limitedly engaged with the inner surface of the limiting ring (26); and a rotation pad (15) is arranged on the inner surface of the pedal (7) away from the limiting ring (26).

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