Bicycle center shaft transmission device

Abstract

The utility model discloses a bicycle center shaft transmission device, and relates to the technical field of bicycle transmission, the bicycle center shaft transmission device comprises a protective frame, two groups of second shaft seats are arranged on both sides of the protective frame, a group of rear wheel shafts and a group of front wheel shafts are rotatably connected to the interiors of the two groups of second shaft seats respectively, and a group of cranks are fixedly connected to both ends of the front wheel shafts; the outer surfaces of the sides, away from each other, of the cranks are each provided with a set of supporting rods, the tail ends of the other sides of the supporting rods are each rotationally connected with a set of pedals, bearings are arranged on the peripheries of the two sides, away from the protective frame, of the front wheel shaft, and a set of oil injection grooves are formed between the inner walls of the top of the protective frame. The arrangement direction of the two sets of supporting rods is perpendicular to the extending direction of the corresponding cranks, a plurality of sets of fixing nuts are arranged on the outer surface of one side of the protection frame, a plurality of sets of fixing holes are correspondingly formed in the inner wall of the protection frame, and the outer surface of each set of fixing nuts is rotationally connected with the inner surface of the corresponding fixing hole. Through cooperation of the structures, effective transmission of force during riding can be ensured, and therefore the stability, comfort and efficiency of riding are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycle transmission technology, and specifically relates to a bicycle bottom bracket transmission device. Background Art

[0002] The bicycle bottom bracket transmission device is an advanced transmission system that realizes power transmission through the transmission mechanism inside the bottom bracket. This system mainly consists of a bottom bracket, cranks, pedals, bearings, and internal transmission rods and gears. When the rider steps on the pedals, the cranks drive the bottom bracket to rotate, and the internal transmission rods and gears directly transmit the force to the rear wheel, thereby driving the bicycle forward. In addition, bicycles with bottom bracket transmission devices also have the advantages of labor-saving, durable, safe, and flexible, bringing a more comfortable and pleasant riding experience to riders.

[0003] The utility model with the publication number CN220865553U discloses a bicycle bottom bracket transmission device, which includes a transmission shaft. A bottom bracket sleeve rotates on the outer periphery of the transmission shaft. Connecting rods are fixed on the outer peripheries at both ends of the transmission shaft. A pedal is fixed on one side of each connecting rod. A driving gear is fixed on the outer periphery of the transmission shaft. A chain meshes and rotates on the outer periphery of the driving gear. A rear wheel gear meshes and rotates on the inner side of the chain. A rear wheel shaft is fixed on the inner side of the rear wheel gear. A connecting plate is fixed on one side of the bottom bracket sleeve. A mounting plate is fixed on one side of the connecting plate. A number of holes are provided on one side of the mounting plate, and the holes are rotatably connected to the transmission shaft and the rear wheel shaft.

[0004] In the process of implementing this application, it is found that this technology has the following problems: in the above patent document, the bicycle bottom bracket transmission device does not have a lubrication component, which accelerates wear and affects the service life. At the same time, the increased friction leads to energy loss and reduces the transmission efficiency of the bicycle.

[0005] Therefore, a bicycle bottom bracket transmission device is proposed. Summary of the Utility Model

[0006] The purpose of the present utility model is: in order to reduce the energy loss caused by friction and improve the transmission efficiency of the bicycle, this application provides a bicycle bottom bracket transmission device.

[0007] The technical solution adopted by the present utility model is as follows:

[0008] A bicycle bottom bracket transmission device includes a protective frame. Two groups of second shaft seats are provided on both sides of the protective frame. A rear wheel shaft and a front wheel shaft are respectively rotatably connected inside the two groups of second shaft seats. A group of cranks are fixedly connected to both ends of the front wheel shaft. A group of support rods are arranged on the outer surfaces of the cranks on the sides away from each other. A group of pedals are rotatably connected to the other ends of the support rods.

[0009] Bearings are provided on the outer peripheries of both sides of the front wheel axle away from the protection frame. A group of oil injection grooves are provided between the inner walls of the top of the protection frame. The setting directions of the two groups of support rods are perpendicular to the extension directions of the corresponding cranks. A number of groups of fixing nuts are provided on the outer surface of one side of the protection frame, and a number of groups of fixing holes are correspondingly provided on the inner wall of the protection frame. The outer surfaces of each group of fixing nuts are rotatably connected to the inner surfaces of the corresponding fixing holes.

[0010] Further, a limiting member is snap-fitted on the top of the oil injection groove, a limiting ring is provided on the inner surface of the top of the oil injection groove. The interior of the oil injection groove includes an oil injection hole, a spring and a ball. The oil injection hole is provided at the bottom of the oil injection groove. A spring is provided between the inner surface of the bottom of the oil injection groove and the outer surface of the bottom of the ball. The diameter of the ball is smaller than the inner diameter of the limiting ring.

[0011] Further, a gear sleeve is provided between the two groups of bearings. A driving gear is provided on the outer periphery of the gear sleeve. The inner surface of the gear sleeve is fixedly connected to the outer surface of the front wheel axle. A second rotating rod is rotatably connected between the inner surfaces of the front and rear sides of the protection frame. The oil injection hole is provided directly above the driving gear.

[0012] Further, a driven gear and a first bevel gear are provided on the outer periphery of the second rotating rod. The outer surface of the driven gear meshes with the outer surface of the driving gear. A limiting connecting rod is fixedly connected between the inner surfaces of the front and rear sides of the protection frame.

[0013] Further, a fixing sleeve is vertically provided on the limiting connecting rod. A first rotating rod is rotatably connected to the inner surface of the fixing sleeve. A group of second bevel gears are fixedly connected to both ends of the first rotating rod. A group of third bevel gears are fixedly connected to the outer surface of the rear wheel axle.

[0014] Further, the outer surface of the front second bevel gear meshes with the outer surface of the first bevel gear, and the outer surface of the other second bevel gear meshes with the outer surface of the third bevel gear.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are:

[0016] 1. In this utility model, when a cyclist rides a bicycle using the bottom bracket drive device, the cyclist rotates the crank through the pedal. Two sets of cranks are fixedly connected to the front wheel axle. The outer surfaces of two sets of bearings are fixed to the bicycle frame. The rotation of the crank drives the rotation of the front wheel axle, and the rotation of the front wheel axle drives the rotation of the driving gear around it. Since the outer surface of the driving gear meshes with the outer surface of the driven gear, the rotation of the driving gear will drive the rotation of the driven gear. The driven gear is fixed on the second rotating rod, and the rotation of the driven gear drives the corresponding second rotating rod to rotate, thereby causing the corresponding first bevel gear to rotate. The rotation of the first bevel gear drives the rotation of a set of second bevel gears. Since the outer surface of the first rotating rod is rotationally connected to the inner surface of the fixed sleeve, the rotation of a set of second bevel gears will drive the rotation of another set of second bevel gears, thereby causing the third bevel gear to rotate, achieving the purpose of stable transmission.

[0017] 2. In this utility model, two sets of protective frames are limited and fixed by fixing nuts. By opening the limiting member, lubricating oil is injected into the oil injection groove. The lubricating oil drips onto the surface of the driving gear through the oil injection hole, and reaches the outer surfaces of other meshing gears through gear transmission, thereby effectively reducing the friction during transmission, reducing the energy loss caused by friction, and improving the transmission efficiency of the bicycle. The chainless design not only improves the transmission efficiency and stability, but also reduces the safety hazards caused by chain wear and detachment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the whole of this utility model;

[0019] Figure 2 is a schematic structural diagram of the transmission component of this utility model;

[0020] Figure 3 is a schematic structural diagram of the oil injection component of this utility model;

[0021] Figure 4 is a schematic structural diagram of the middle bearing of this utility model.

[0022] In the figure: 1 - protective frame; 2 - rear wheel axle; 3 - second axle seat; 4 - limiting member; 5 - bearing; 6 - front wheel axle; 7 - crank; 8 - support rod; 9 - foot pedal; 10 - fixed sleeve; 11 - first rotating rod; 12 - second bevel gear; 13 - ball; 14 - oil injection groove; 15 - spring; 16 - oil injection hole; 17 - fixing nut; 18 - fixing hole; 19 - driven gear; 20 - gear sleeve; 21 - driving gear; 22 - first bevel gear; 23 - second rotating rod; 24 - limiting connecting rod; 25 - third bevel gear; 26 - limiting ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

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

[0024] Refer to Figures 1-4 , a bicycle bottom bracket drive device, comprising a protective frame 1. Two groups of second shaft seats 3 are respectively opened on both sides of the protective frame 1. A group of rear wheel shafts 2 and a front wheel shaft 6 are respectively rotatably connected inside the two groups of second shaft seats 3. A group of cranks 7 are fixedly connected to both ends of the front wheel shaft 6. A group of support rods 8 are respectively arranged on the outer surfaces of the cranks 7 away from each other. The other ends of the support rods 8 are rotatably connected to a group of pedals 9. Bearings 5 are arranged on the peripheries of both sides of the front wheel shaft 6 away from the protective frame 1. An oil injection groove 14 is arranged between the inner walls of the top of the protective frame 1. The arrangement directions of the two groups of support rods 8 are perpendicular to the extension directions of the corresponding cranks 7. A number of fixing nuts 17 are arranged on the outer surface of one side of the protective frame 1. Corresponding fixing holes 18 are arranged on the inner wall of the protective frame 1. The outer surfaces of each group of fixing nuts 17 are rotatably connected to the inner surfaces of the corresponding fixing holes 18. Specifically, through the cooperation of the above structures, the effective transmission of force during riding can be ensured, thereby improving the smoothness, comfort, and efficiency of riding.

[0025] Refer to Figures 1-4 , a limiting member 4 is clamped and arranged on the top of the oil injection groove 14. A limiting ring 26 is arranged on the inner surface of the top of the oil injection groove 14. The inside of the oil injection groove 14 includes an oil injection hole 16, a spring 15, and a ball 13. An oil injection hole 14 is opened at the bottom of the oil injection groove 14. A spring 15 is arranged between the inner surface of the bottom of the oil injection groove 14 and the outer surface of the bottom of the ball 13. The diameter of the ball 13 is smaller than the inner diameter of the limiting ring 26. Specifically, the two protective frames 1 are limited and fixed by the fixing nuts 17. By opening the limiting member 4, lubricating oil is injected into the oil injection groove 14, and the lubricating oil drips onto the surface of the driving gear 21 through the oil injection hole 16. A gear sleeve 20 is arranged between the two bearings 5. A driving gear 21 is arranged on the periphery of the gear sleeve 20. The inner surface of the gear sleeve 20 is fixedly connected to the outer surface of the front wheel shaft 6. A second rotating rod 23 is rotatably connected between the inner surfaces of the front and rear sides of the protective frame 1. The oil injection hole 16 is arranged directly above the driving gear 21. Specifically, since the outer surface of the driving gear 21 meshes with the outer surface of the driven gear 19, the rotation of the driving gear 21 will drive the rotation of the driven gear 19. The driven gear 19 is fixed on the second rotating rod 23, and the rotation of the driven gear 19 drives the corresponding second rotating rod 23 to rotate, thereby causing the corresponding first bevel gear 22 to rotate.

[0026] Referring to Figures 1-4 , a set of driven gears 19 and a set of first bevel gears 22 are arranged on the periphery of the second rotating rod 23. The outer surface of the driven gear 19 meshes with the outer surface of the driving gear 21. A set of limiting connecting rods 24 are fixedly connected between the inner surfaces of the front and rear sides of the protective frame 1. Specifically, a set of driven gears 19 and first bevel gears 22 are arranged around the second rotating rod 23. The driven gear 19 meshes with the driving gear 21 to transmit power. A set of fixed sleeves 10 are vertically arranged on the limiting connecting rod 24. The inner surface of the fixed sleeve 10 is rotatably connected with a first rotating rod 11. A set of second bevel gears 12 are fixedly connected to both ends of the first rotating rod 11. A set of third bevel gears 25 are fixedly connected to the outer surface of the rear wheel axle 2. Specifically, the rotation of the first bevel gear 22 drives the rotation of a set of second bevel gears 12. Since the outer surface of the first rotating rod 11 is rotatably connected with the inner surface of the fixed sleeve 10, the rotation of a set of second bevel gears 12 drives the rotation of the other set of second bevel gears 12.

[0027] Referring to Figures 1-4 , the outer surface of the front second bevel gear 12 meshes with the outer surface of the first bevel gear 22, and the outer surface of the other set of second bevel gears 12 meshes with the outer surface of the third bevel gear 25. Specifically, since the outer surface of the first rotating rod 11 is rotatably connected with the inner surface of the fixed sleeve 10, the rotation of a set of second bevel gears 12 drives the rotation of the other set of second bevel gears 12, thereby driving the rotation of the third bevel gear 25 to achieve the purpose of stable transmission.

[0028] The implementation principle of the embodiment of the bicycle bottom bracket drive device in this application is as follows:

[0029] When a rider uses the bicycle bottom bracket drive device to ride a bicycle, the rider rotates the crank 7 through the pedal. The two cranks 7 are fixedly connected to the front wheel axle 6. The outer surfaces of the two bearings 5 are fixed to the bicycle frame. The rotation of the crank 7 drives the rotation of the front wheel axle 6. The rotation of the front wheel axle 6 drives the rotation of the driving gear 21 on its periphery. Since the outer surface of the driving gear 21 meshes with the outer surface of the driven gear 19, the rotation of the driving gear 21 drives the rotation of the driven gear 19. The driven gear 19 is fixed on the second rotating rod 23. The rotation of the driven gear 19 drives the corresponding second rotating rod 23 to rotate, thereby driving the rotation of the corresponding first bevel gear 22. The rotation of the first bevel gear 22 drives the rotation of a set of second bevel gears 12. Since the outer surface of the first rotating rod 11 is rotatably connected with the inner surface of the fixed sleeve 10, the rotation of a set of second bevel gears 12 drives the rotation of the other set of second bevel gears 12, thereby driving the rotation of the third bevel gear 25 to achieve the purpose of stable transmission.

[0030] On the other hand, the two groups of protective frames 1 are limited and fixed by the fixing nut 17. By opening the limiting member 4, lubricating oil is injected into the oil injection groove 14. The lubricating oil drips onto the surface of the driving gear 21 through the oil injection hole 16 and reaches the outer surfaces of other meshing gears through gear transmission, thereby effectively reducing the friction during the transmission process, reducing the energy loss caused by friction, and improving the transmission efficiency of the bicycle. The chainless design not only improves the transmission efficiency and stability but also reduces the safety hazards caused by chain wear and detachment.

[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 described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bicycle middle shaft transmission device, comprising a protective frame (1), characterized in that: Two sets of second axle seats (3) are provided on both sides of the protection frame (1), and a set of rear wheel axles (2) and front wheel axles (6) are rotatably connected inside the two sets of second axle seats (3), and both ends of the front wheel axles (6) are fixedly connected to a set of cranks (7), and the outer surfaces of the cranks (7) on the sides away from each other are provided with a set of support rods (8), and the other ends of the support rods (8) are rotatably connected to a set of pedals (9); The front wheel axle (6) is provided with bearings (5) on both sides away from the protective frame (1), a group of oil filling grooves (14) are provided between the inner walls at the top of the protective frame (1), the two groups of support rods (8) are arranged in a direction perpendicular to the extension direction of the corresponding crank (7), a plurality of groups of fixing nuts (17) are provided on the outer surface of one side of the protective frame (1), and a plurality of groups of fixing holes (18) are correspondingly provided on the inner wall of the protective frame (1), and the outer surface of each group of fixing nuts (17) is rotatably connected to the inner surface of the corresponding fixing hole (18).

2. A bicycle middle shaft transmission device as claimed in claim 1, characterized in that: A limiting member (4) is clamped at the top of the oil filling groove (14), a limiting ring (26) is provided on the inner surface of the top of the oil filling groove (14), the interior of the oil filling groove (14) comprises an oil filling hole (16), a spring (15) and a ball (13), the bottom of the oil filling groove (14) is provided with the oil filling hole (16), the spring (15) is provided between the inner surface of the bottom of the oil filling groove (14) and the outer surface of the bottom of the ball (13), and the diameter of the ball (13) is smaller than the inner diameter of the limiting ring (26).

3. A bicycle middle shaft transmission device as claimed in claim 2, characterized in that: A gear sleeve (20) is arranged between the two groups of bearings (5), a driving gear (21) is arranged on the periphery of the gear sleeve (20), the inner surface of the gear sleeve (20) is fixedly connected to the outer surface of the front wheel shaft (6), a group of second rotating rods (23) are rotatably connected between the inner surfaces of the front and rear sides of the protection frame (1), and the oil filling hole (16) is arranged directly above the driving gear (21).

4. A bicycle middle shaft transmission device as claimed in claim 3, characterized in that: A group of driven gears (19) and a group of first bevel gears (22) are arranged on the periphery of the second rotating rod (23); the outer surface of the driven gear (19) meshes with the outer surface of the driving gear (21); and a group of limiting connecting rods (24) are fixedly connected between the inner surfaces of the front and rear sides of the protective frame (1).

5. A bicycle middle shaft transmission device as claimed in claim 4, characterized in that: The limit link (24) is vertically provided with a set of fixed sleeves (10), the inner surface of the fixed sleeve (10) is rotatably connected to a first rotating rod (11), both ends of the first rotating rod (11) are fixedly connected to a set of second bevel gears (12), and the outer surface of the rear wheel shaft (2) is fixedly connected to a set of third bevel gears (25).

6. A bicycle middle shaft transmission device as claimed in claim 5, characterized in that: The outer surface of the second bevel gear (12) on the front side meshes with the outer surface of the first bevel gear (22), and the outer surface of another set of the second bevel gears (12) meshes with the outer surface of the third bevel gear (25).

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