Bicycle crank assembly with automatic lubrication function

Abstract

The utility model relates to the field of bicycle, and disclose a bicycle crank assembly with automatic lubricating function mainly includes crank one, axle, tooth disc, crank two and pedal axle, the inside of crank one is fixedly installed with support block near the pedal axle department, is connected with fibre oil rope on the support block, the other end of fibre oil rope is located in the oil duct, forms through lubricating passage through double crank hollow structure and axle oil duct, relies on the adsorption characteristic of fibre oil rope of crank one and the structure that the counterweight sliding block of crank two combines spring and piston extruded sponge block, can realize long -term automatic lubrication in cooperation, need not frequent manual disassembly maintenance, greatly reduces operation difficulty and use cost, simultaneously, with the help sealed joint and the oil plug with sealed rubber ring, can effectively avoid lubricant loss and external dust, moisture invasion, improves lubricating system stability and service life.

Description

Technical Field

[0001] This utility model relates to the field of bicycles, specifically a bicycle crank assembly with an automatic lubrication function. Background Technology

[0002] As a widely used means of transportation and exercise, the smoothness and reliability of the transmission system of bicycles directly affect the riding experience and the lifespan of components. Among them, the crank assembly, as the core component for transmitting riding power, is crucial for the lubrication of its bearings. However, in daily use, due to the natural consumption and aging of grease, as well as the intrusion of dust and moisture, regular lubrication maintenance is essential. Traditional maintenance methods are not only cumbersome and difficult for ordinary users to master, but are also easily overlooked, leading to increased transmission resistance, accelerated wear of components, and even premature failure. Therefore, developing an automatic lubrication crank assembly that can achieve "one-time filling, long-term effectiveness" is an urgent practical need to improve the convenience of bicycle maintenance, reduce long-term operating costs, and ensure transmission efficiency.

[0003] Traditional bicycle crank assemblies lack a dedicated automatic lubrication structure. Lubrication relies on manual disassembly of components such as the crank and bottom bracket to manually add lubricant to friction points. This is not only cumbersome and time-consuming, but also prone to insufficient lubrication of critical parts such as the bottom bracket and pedal axles due to untimely maintenance or improper operation by the user, thus accelerating component wear and shortening service life. At the same time, the sealing performance of traditional assemblies is weak, and manually added lubricant is easily lost due to riding vibrations, dust intrusion, and rainwater erosion. This not only wastes lubricant but also fails to continuously guarantee the lubrication effect of the friction surfaces. Furthermore, external impurities can easily enter the friction gaps, causing abnormal wear and further reducing the transmission efficiency and durability of the assembly, making it difficult to meet users' needs for long-term stable use of bicycles. Therefore, we propose a bicycle crank assembly with an automatic lubrication function. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a bicycle crank assembly with an automatic lubrication function, thus solving the aforementioned problems.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a bicycle crank assembly with automatic lubrication function, comprising a crank one, a bottom bracket, a chainring, a crank two, and a pedal axle. The bottom bracket is coaxially fixedly connected to the middle of the chainring. Crank one is coaxially fixedly connected to one end of the bottom bracket. Crank two is coaxially fixedly connected to the other end of the bottom bracket. A pedal axle is fixedly mounted on the other end of crank two and crank one. A pedal is mounted on the pedal axle. Both crank one and crank two are hollow inside; The crank one is provided with a lubrication mechanism one, and the crank two is provided with a lubrication mechanism two.

[0006] Preferably, the central shaft has an oil channel inside.

[0007] Preferably, an oil outlet hole is provided on the end of the crank one and the crank two that is connected to the central shaft; The oil supply channel runs through both sides of the central shaft, and the oil supply channel is connected to the oil outlet holes on crank one and crank two.

[0008] Preferably, the lubrication mechanism includes a fiber oil rope, and a support block is fixedly installed inside the crank near the pedal shaft. The fiber oil rope is connected to the support block, and the other end of the fiber oil rope is located in the oil delivery channel.

[0009] Preferably, the second lubrication mechanism includes a counterweight slider, a spring, and a piston. The counterweight slider is slidably connected inside the second crank near the pedal shaft. A spring is fixedly installed on the side of the counterweight slider away from the pedal shaft, and a piston is fixedly installed on the other end of the spring. The piston and the second crank are slidably connected coaxially.

[0010] Preferably, a sponge block is installed inside the crank two, corresponding to the area below the piston.

[0011] Preferably, an oil injection hole is installed on the side wall of the crank two away from the oil outlet hole. The inner wall of the oil injection hole is provided with a threaded hole, the outer wall of the oil plug is provided with a threaded hole, and a "V" shaped annular groove is provided on the outer wall of the oil plug in front of the threaded hole. A sealing rubber ring is fixedly installed in the annular groove, and a rotating handle is fixedly installed on the outer surface of the oil plug. The threaded hole on the oil plug and the threaded hole on the oil injection hole are threadedly connected, and the sealing rubber ring is in contact with the inside of the oil injection hole.

[0012] Preferably, sealing joints are coaxially fixedly connected to the oil outlet holes of crank one and crank two, and the other ends of the two sealing joints are coaxially fixedly connected to the two ends of the central shaft, respectively.

[0013] Compared with the prior art, this utility model provides a bicycle crank assembly with automatic lubrication function, which has the following beneficial effects: This bicycle crank assembly with automatic lubrication function forms a continuous lubrication path through the hollow structure of the double crank and the oil channel of the bottom bracket. Relying on the adsorption properties of the fiber oil rope of crank one and the structure of the counterweight slider of crank two combined with the spring and piston to squeeze the sponge block, it can achieve long-term automatic lubrication without the need for frequent manual disassembly and maintenance, which greatly reduces the difficulty of operation and the cost of use. At the same time, with the help of the sealing joint and the oil plug with sealing rubber ring, it can effectively prevent lubricant loss and the intrusion of external dust and moisture, improving the stability and service life of the lubrication system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the crank mechanism of this utility model; Figure 4 This is a schematic diagram of the crank mechanism of this utility model. Figure 5 This is a two-section schematic diagram of the crank mechanism of this utility model; Figure 6 for Figure 4 A magnified view of part A in the diagram.

[0015] In the diagram: 1. Crank 1; 2. Sealing joint; 3. Bottom shaft; 4. Chainring; 5. Crank 2; 6. Pedal shaft; 7. Fiber oil rope; 8. Counterweight slider; 9. Spring; 10. Piston; 11. Sponge block; 12. Oil plug; 13. Sealing rubber ring; 14. Oil injection hole; 15. Oil supply channel. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-6 A bicycle crank assembly with automatic lubrication function includes crank 1, bottom bracket 3, chainring 4, crank 2 5 and pedal shaft 6. The bottom bracket 3 is coaxially fixedly connected to the middle of the chainring 4. Crank 1 is coaxially fixedly connected to one end of the bottom bracket 3. Crank 2 5 is coaxially fixedly connected to the other end of the bottom bracket 3. Pedal shaft 6 is fixedly installed on the other end of crank 2 5 and crank 1. Pedals are installed on pedal shaft 6. Both crank 1 and crank 2 5 are hollow inside; A lubrication mechanism 1 is provided inside crank 1, and a lubrication mechanism 2 is provided inside crank 2 5.

[0018] Furthermore, the central shaft 3 has an oil channel 15 inside. As the core channel for the flow of lubricant inside the component, the oil channel 15 can not only collect the lubricant from crank 1 and crank 2 5, but also guide the lubricant evenly to the connecting friction surfaces of the central shaft 3 and crank 1 and crank 2 5 according to the rotation characteristics of the central shaft 3, so as to ensure that all key friction points in the component can be covered by lubricant and avoid wear problems caused by local lubrication deficiency.

[0019] Furthermore, oil outlet holes are provided on the ends of crank 1 and crank 2 5 that are connected to the central shaft 3. The oil outlet holes are the key interface for the lubricant to be transported from the crank to the oil channel 15 of the central shaft 3. The opening position is aligned with the oil channel 15, which can reduce the retention of lubricant during the transmission process and ensure that the lubricant enters the oil channel 15 quickly. Oil passage 15 runs through both sides of the central shaft 3, and oil passage 15 is connected to the oil outlet holes on crank 1 and crank 2 5. Oil passage 15 can achieve bidirectional oil intake, allowing lubricant from crank 1 and crank 2 5 to converge in oil passage 15, thereby improving lubrication efficiency.

[0020] Furthermore, the lubrication mechanism includes a fiber oil rope 7. A support block is fixedly installed inside the crank 1 near the pedal shaft 6, and the fiber oil rope 7 is connected to the support block. The other end of the fiber oil rope 7 is located inside the oil channel 15. The support block provides stable installation support for the fiber oil rope 7, preventing the fiber oil rope 7 from shifting or falling off inside the crank 1 as the crank rotates, and ensuring that the fiber oil rope 7 always maintains an effective connection with the oil channel 15. With its porous adsorption structure, the fiber oil rope 7 can continuously adsorb the lubricant stored in the hollow cavity of the crank 1, and can stably deliver lubricant to the oil channel 15 even when riding at low speed or when the components are tilted, ensuring the continuity of lubrication.

[0021] Furthermore, the second lubrication mechanism includes a counterweight slider 8, a spring 9, and a piston 10. The counterweight slider 8 is slidably connected inside the crank 2 5 near the pedal shaft 6. The spring 9 is fixedly installed on the side of the counterweight slider 8 away from the pedal shaft 6. The piston 10 is fixedly installed on the other end of the spring 9. The piston 10 and the crank 2 5 are slidably connected coaxially. The higher the rotational speed, the greater the centrifugal force, and the farther the counterweight slider 8 slides. In turn, the spring 9 generates different thrusts on the piston 10, thereby realizing the dynamic adjustment of the lubricant output.

[0022] Furthermore, a sponge block 11 is installed inside the crank 2 5 below the piston 10. In addition to storing lubricant, the sponge block 11 also has a certain filtering function, which can filter out tiny impurities that may be mixed in the lubricant and prevent impurities from entering the friction surface with the lubricant and causing abnormal wear. At the same time, the elastic properties of the sponge block 11 can buffer the squeezing force of the piston 10 and prevent the lubricant from gushing out in large quantities due to excessive thrust of the piston 10, so as to achieve a quantitative and stable supply of lubricant.

[0023] Furthermore, an oil injection hole 14 is installed on the side wall of crank 2 5 away from the oil outlet. The inner wall of the oil injection hole 14 is provided with a threaded hole, and the outer wall of the oil plug 12 is provided with a threaded hole. A "V" shaped annular groove is provided on the outer wall of the oil plug 12 in front of the threaded hole. A sealing rubber ring 13 is fixedly installed in the annular groove, and a rotating handle is fixedly installed on the outer surface of the oil plug 12. The threaded hole on the oil plug 12 and the threaded hole on the oil injection hole 14 are threadedly connected, and the sealing rubber ring 13 is in contact with the inside of the oil injection hole 14.

[0024] Furthermore, sealing joints 2 are coaxially fixedly connected to the oil outlet holes of crank 1 and crank 2 5, and the other ends of the two sealing joints 2 are coaxially fixedly connected to the two ends of the central shaft 3 respectively.

[0025] Structural Description: Crank 1: Crank 1 is the carrier of the power transmission and lubrication mechanism. It is a hollow rod-shaped structure. One end is fixed coaxially with the bottom bracket 3, and the other end is fixed with the pedal shaft 6. A support block is installed inside near the pedal shaft 6 and connected to the fiber oil rope 7. The oil outlet is connected to the sealing joint 2. It can transmit riding power and also accommodate the lubrication mechanism 1 through the hollow structure, providing installation space for the fiber oil rope 7 and helping to realize automatic lubrication. Sealing joint 2: Sealing joint 2 is a sealing and connecting component. It is coaxially fixed in the oil outlet holes of crank 1 and crank 2 5, and the other end is fixed to both ends of the central shaft 3. It can seal the connection gap between the crank and the central shaft 3 to prevent lubricant leakage. At the same time, it ensures that the oil outlet of the crank is precisely connected to the oil supply channel 15 of the central shaft 3, ensuring that the lubrication passage is sealed and smooth. Central shaft 3: The central shaft 3 is the core connection and oil supply component. It is a rod-shaped structure with the crank 4 coaxially fixed in the middle and crank 1 and crank 2 5 connected at both ends respectively. It has an oil supply channel 15 that runs through both sides. It can connect and support the double crank and the crank 4, transmit the crank power to the crank 4, and deliver the lubricant of the double crank to each friction point through the oil supply channel 15. Chainring 4: Chainring 4 is the core component for power transmission. It is a toothed disc structure with the bottom bracket 3 coaxially fixed in the middle. By meshing with the chain, it can convert the crank power transmitted by the bottom bracket 3 into the power to drive the bicycle forward. It is the key to connecting the crank assembly and the bicycle drivetrain, ensuring the effective transmission of riding power. Crank 2 5: Crank 2 5 is the main body for power transmission and lubrication mechanism installation. It is a hollow rod-shaped structure with one end connected to the central shaft 3 and the other end installed with the pedal shaft 6. Inside, there is a counterweight slider 8, a spring 9, a piston 10, and a sponge block 11. The side wall is equipped with an oil injection hole 14. It can transmit power and also accommodate the lubrication mechanism 2 through the hollow structure, store lubricant and realize extrusion oil supply. Pedal Shaft 6: Pedal shaft 6 is the pedal mounting and power transmission component. It is fixed to the end of crank 1 and crank 2 5 away from the bottom bracket 3. It is used to mount the pedal and can transmit the force of the rider's foot pedaling to the crank, thereby driving the bottom bracket 3 and chainring 4 to rotate. It is the key to connecting the pedal and the crank, ensuring that the riding power is transmitted to the crank assembly. Fiber oil rope 7: Fiber oil rope 7 is a lubrication delivery component. One end is connected to the support block inside crank 1, and the other end extends into the oil channel 15 of the central shaft 3. Relying on its own adsorption characteristics, it can adsorb and continuously deliver lubricant to the oil channel 15, providing stable lubrication for the central shaft 3 and related friction points. It is the core structure of automatic oil supply on the crank 1 side. Counterweight slider 8: Counterweight slider 8 is a lubrication triggering component. It is slidably connected inside crank 2 5 near pedal shaft 6. A spring 9 is fixed on one side. It can generate centrifugal force as crank 2 5 rotates, pushing spring 9 to squeeze piston 10, thereby causing sponge block 11 to release lubricant. It is the key triggering structure for realizing squeeze oil supply on crank 2 5. Spring 9: Spring 9 is a force transmission component. One end is fixed to the counterweight slider 8, and the other end is fixed to the piston 10. It can transmit the thrust generated by the centrifugal force of the counterweight slider 8 to the piston 10, pushing the piston 10 to squeeze the sponge block 11. At the same time, it assists the counterweight slider 8 to reset when there is no centrifugal force, ensuring that the subsequent lubrication action is carried out in a cycle. Piston 10: Piston 10 is a lubricant extrusion component, which is slidably connected to crank 2 5 on the same axis. It is connected to spring 9 on one side and can move towards sponge block 11 under the thrust of spring 9, extruding sponge block 11 to release lubricant, converting power into extrusion action, and helping to deliver lubricant to oil channel 15. Sponge block 11: Sponge block 11 is a lubricant storage and release component. It is installed inside the crank 2 5 below the piston 10. It can absorb and store the lubricant injected from the oil injection hole 14 and release the lubricant under the squeezing action of the piston 10, so as to realize the temporary storage and quantitative supply of lubricant and ensure continuous and stable lubrication. Oil plug 12: Oil plug 12 is a sealing component for the oil filling hole. The outer wall has a threaded hole that is threaded to the oil filling hole 14. The outer surface is equipped with a rotating handle. The oil filling hole 14 can be sealed by the threaded connection to prevent internal lubricant leakage and external impurities from entering. The rotating handle makes it easy to disassemble and assemble the oil plug 12 and to replenish the lubricant. Sealing rubber ring 13: Sealing rubber ring 13 is a sealing enhancement component, fixed in the "V" shaped annular groove on the outer wall of the oil plug 12, and in contact with the inside of the oil injection hole 14. It can enhance the sealing effect between the oil plug 12 and the oil injection hole 14, further preventing lubricant leakage and dust and moisture intrusion, and ensuring the cleanliness of the lubrication system. Oil filling hole 14: Oil filling hole 14 is a lubricant replenishment channel. It is installed on the side wall of crank 2 5 away from the oil outlet. The inner wall has a threaded hole that cooperates with the oil plug 12. It can be used as an inlet to replenish lubricant to the sponge block 11 inside crank 2 5. By cooperating with the oil plug 12 and the sealing rubber ring 13, it can achieve convenient oil replenishment and sealing to prevent leakage. Oil channel 15: Oil channel 15 is a lubricant delivery channel. It is located inside the central shaft 3 and runs through both sides of the central shaft 3. It is connected to the oil outlet holes of crank 1 and crank 2 5. It can collect the lubricant delivered by the fiber oil rope 7 on the crank 1 side and the lubricant released by the sponge block 11 on the crank 2 5 side, and deliver it to key friction points such as the connection surface between the central shaft 3 and the crank. It is the core channel of the lubrication passage.

[0026] Working principle: When the rider pedals, the force on the pedal is transmitted to crank 1 and crank 2 5 through the pedal shaft 6, causing them to rotate synchronously around the bottom shaft 3. The bottom shaft 3 rotates with the crank, which in turn drives the coaxially fixed chainring 4 to rotate. The chainring 4 converts the power into the power to drive the bicycle forward by meshing with the chain, thus realizing the core transmission function.

[0027] Meanwhile, the automatic lubrication system is activated. On the crank 1 side, the fiber oil rope 7 fixed to the internal support block continuously absorbs and delivers the lubricant stored in the hollow structure of crank 1 to the oil channel 15 extending into the central shaft 3, relying on its own adsorption properties. On the crank 2 side, the counterweight slider 8, which rotates with crank 2, slides away from the pedal shaft 6 due to centrifugal force. During the sliding process, it compresses the spring 9 fixed on one side. The spring 9 transmits the thrust to the piston 10 fixed at the other end, pushing the piston 10 to move along the same axis as crank 2 in the direction of the sponge block 11. The piston 10 compresses the corresponding sponge block 11 installed inside crank 2, causing the sponge block 11 to release the lubricant previously injected and stored from the oil injection hole 14, thus lubricating the crank 2. After being squeezed, the lubricant flows to the oil outlet at the connection end between crank 2 5 and bottom shaft 3. At this time, the sealing joint 2, which is coaxially fixed in the oil outlet of crank 1 1 and crank 2 5, plays a role. On the one hand, it seals the connection gap between the crank and bottom shaft 3 to prevent lubricant leakage. On the other hand, it ensures that the oil outlet of the crank is precisely connected to the oil channel 15 of the bottom shaft 3, so that the lubricant delivered by the fiber oil rope 7 on the crank 1 1 side and the lubricant squeezed out by the sponge block 11 on the crank 2 5 side can smoothly enter the oil channel 15 of the bottom shaft 3. The oil channel 15 of the bottom shaft 3 runs through both sides, and evenly delivers the collected lubricant to the connection surfaces of the bottom shaft 3 and crank 1 1, crank 2 5, and the mating surfaces of the pedal shaft 6 and the crank, etc., to achieve lubrication of each friction part.

[0028] When not in riding mode, the crank stops rotating, the centrifugal force of the counterweight slider 8 inside crank 2 5 disappears, the spring 9 returns to its original deformation and pulls the counterweight slider 8 back to its original position, the piston 10 returns to its original position along with the counterweight slider 8, and the sponge block 11 returns to its fluffy state, preparing for the next absorption and storage of lubricant. In addition, the oil plug 12 threaded at the oil filling hole 14 and the sealing rubber ring 13 fixed in the "V"-shaped annular groove on the outer wall of the oil plug 12 work together to ensure that the sealing rubber ring 13 is in close contact with the inside of the oil filling hole 14. This not only prevents the lubricant inside crank 2 5 from leaking from the oil filling hole 14, but also prevents external dust and moisture from entering the inside of crank 2 5 through the oil filling hole 14 and contaminating the lubricant and components, ensuring the cleanliness and stability of the lubrication system. Through the linkage of various structures, this device can achieve efficient power transmission while continuously providing long-term and stable automatic lubrication for key friction points, greatly reducing the need for manual maintenance, avoiding lubricant loss and impurity intrusion, reducing component wear, extending the service life of components, and ensuring the long-term smooth operation of the bicycle transmission system.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bicycle crank assembly with an automatic lubrication function, characterized in that, include: Crank 1 (1), bottom bracket (3), chainring (4), crank 2 (5) and pedal shaft (6), the middle of chainring (4) is coaxially fixedly connected to bottom bracket (3), one end of bottom bracket (3) is coaxially fixedly connected to crank 1 (1), the other end of bottom bracket (3) is coaxially fixedly connected to crank 2 (5), the other end of crank 2 (5) and crank 1 (1) are fixedly mounted to pedal shaft (6), and pedals are mounted on pedal shaft (6); Both crank one (1) and crank two (5) are hollow inside; The crank one (1) is provided with a lubrication mechanism one, and the crank two (5) is provided with a lubrication mechanism two.

2. A bicycle crank assembly with automatic lubrication function according to claim 1, characterized in that, The central shaft (3) has an oil channel (15) inside.

3. A bicycle crank assembly with automatic lubrication function according to claim 2, characterized in that, An oil outlet hole is provided on one end of the crank one (1) and the crank two (5) that are connected to the central shaft (3); The oil channel (15) runs through both sides of the central shaft (3), and the oil channel (15) is connected to the oil outlet holes on the first crank (1) and the second crank (5).

4. A bicycle crank assembly with automatic lubrication function according to claim 2, characterized in that, The lubrication mechanism includes a fiber oil rope (7). A support block is fixedly installed inside the crank (1) near the pedal shaft (6). The fiber oil rope (7) is connected to the support block. The other end of the fiber oil rope (7) is located in the oil delivery channel (15).

5. A bicycle crank assembly with automatic lubrication function according to claim 1, characterized in that, The second lubrication mechanism includes a counterweight slider (8), a spring (9) and a piston (10). The counterweight slider (8) is slidably connected inside the crank two (5) near the pedal shaft (6). The spring (9) is fixedly installed on the side of the counterweight slider (8) away from the pedal shaft (6). The piston (10) is fixedly installed on the other end of the spring (9). The piston (10) and the crank two (5) are slidably connected coaxially.

6. A bicycle crank assembly with automatic lubrication function according to claim 5, characterized in that, A sponge block (11) is installed inside the crank two (5) corresponding to the lower part of the piston (10).

7. A bicycle crank assembly with automatic lubrication function according to claim 3, characterized in that, The crank two (5) has an oil injection hole (14) installed on the side wall away from the oil outlet. The inner wall of the oil injection hole (14) has a threaded hole, and the outer wall of the oil plug (12) has a threaded hole. The outer wall of the oil plug (12) has a "V" shaped annular groove in front of the threaded hole. A sealing rubber ring (13) is fixedly installed in the annular groove. A rotating handle is fixedly installed on the outer surface of the oil plug (12). The threaded hole on the plug (12) and the threaded hole on the oil injection hole (14) are threadedly connected, and the sealing rubber ring (13) is in contact with the interior of the oil injection hole (14).

8. A bicycle crank assembly with automatic lubrication function according to claim 3, characterized in that, The oil outlet holes of crank one (1) and crank two (5) are coaxially fixedly connected with sealing joints (2), and the other ends of the two sealing joints (2) are coaxially fixedly connected to the two ends of the central shaft (3).

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