A sprocket for an automobile engine

Abstract

This utility model relates to the field of automotive engine manufacturing technology and discloses a sprocket for an automotive engine. It includes a sprocket body with a motor shaft at its center for rotating the sprocket body. Two limiting blocks are fixedly connected to the inner wall of the sprocket body near the motor shaft, and the sprocket body is tightly connected to the protrusions on the outer surface of the motor shaft via the two limiting blocks. An anti-loosening component is provided on one side of the sprocket body to prevent the motor shaft from loosening, and the anti-loosening component is sleeved on the outside of the motor shaft. In this utility model, the chain teeth mesh with the engine chain, and the top arc-shaped protrusion fully engages with the chain rollers, improving meshing accuracy, reducing impact noise, and restraining the chain to prevent derailment. The oblique grooves between adjacent chain teeth guide the flow of lubricating oil during operation, improving tooth surface lubrication and assisting in heat dissipation. The anti-loosening component effectively inhibits the loosening of the motor shaft, ensuring transmission stability.

Description

Technical Field

[0001] This utility model relates to the field of automobile engine manufacturing technology, specifically to a sprocket for an automobile engine. Background Technology

[0002] As a key transmission component in automotive engine timing systems, oil pumps, and balance shafts, the sprocket's performance directly affects engine reliability, noise levels, and transmission efficiency. As an indispensable core component in the engine's internal transmission system, it plays a crucial role in power transmission and motion synchronization in multiple key engine mechanisms thanks to its precise tooth design and high-strength structural characteristics. It is not a single-function component but is deeply integrated into core subsystems such as the engine timing system, oil pump system, and balance shaft mechanism, becoming a "transmission bridge" that ensures stable engine operation.

[0003] Currently, traditional engine sprockets mostly employ simple tooth structures and shaft-hole mating methods. During actual high-speed operation, vibration and alternating loads can easily cause relative loosening between the sprocket and the drive shaft, leading to transmission errors, abnormal wear, and even chain derailment, affecting normal engine operation. Furthermore, common sprocket structures lack adequate consideration for lubrication guidance and heat dissipation, easily causing localized poor lubrication and excessive temperature rise, accelerating wear on the chain and sprocket. In addition, some sprockets are structurally heavy in pursuit of strength, increasing the engine's rotational inertia and energy consumption. Therefore, those skilled in the art provide a sprocket for automotive engines to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide a sprocket for an automobile engine, which solves the problems mentioned in the background section of the prior art.

[0005] This utility model provides the following technical solution: a sprocket for an automobile engine, including a sprocket body, a motor shaft for driving the sprocket body to rotate is provided at the center of the interior of the sprocket body, two limiting blocks are fixedly connected to the inner wall of the sprocket body near the motor shaft, and the sprocket body is tightly connected to the protrusions on the outer surface of the motor shaft through the two limiting blocks, and an anti-loosening component for preventing the motor shaft from loosening is provided on one side of the interior of the sprocket body, and the anti-loosening component is sleeved on the outside of the motor shaft.

[0006] As a preferred embodiment of the above technical solution, the outer wall of the sprocket body is circumferentially connected with multiple chain teeth, and the top surface of each of the multiple chain teeth is fixedly connected with an arc-shaped protrusion, the curvature of the arc-shaped protrusion matching the outer curvature of the chain roller.

[0007] As a preferred embodiment of the above technical solution, an oblique groove is provided between two adjacent chain teeth of the sprocket body, a plurality of weight-reducing holes are provided through the circumference of the sprocket body, and an inner trapezoidal surface is provided through the center of the sprocket body.

[0008] As a preferred embodiment of the above technical solution, the anti-loosening component includes a bearing, which is fixedly sleeved on the outside of the motor shaft and fixedly sleeved on the inner wall of the inner trapezoidal surface.

[0009] As a preferred embodiment of the above technical solution, a connecting post is fixedly sleeved on the inner central area of ​​the inner trapezoidal surface, and a sealing ring is fixedly connected to the side of the connecting post away from the bearing.

[0010] As a preferred embodiment of the above technical solution, a side cover is fixedly connected to one end of the sprocket body near the sealing ring. The side cover is fixedly connected to the connecting post through the sealing ring, and the side cover and the sprocket body are fixedly connected by multiple sets of circumferentially arranged screws.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] In this invention, during operation, the motor shaft, through protrusions on its outer surface, tightly engages with two limiting blocks on the inner wall of the sprocket body, effectively transmitting the motor's rotational torque to the sprocket body and driving its rotation. The chain teeth on the outer circumference of the sprocket mesh with the engine chain, and the arc-shaped protrusions at the top of the chain teeth fully conform to the outer circumference of the chain rollers. This not only improves meshing accuracy and reduces impact and noise but also provides radial constraint on the chain, preventing it from slipping off during high-speed operation. The oblique grooves between adjacent chain teeth guide the flow of lubricating oil during rotation, improving tooth surface lubrication and assisting in heat dissipation.

[0013] Based on the aforementioned beneficial effects, the anti-loosening component in this invention is crucial for ensuring transmission stability. Its internal bearings provide radial and axial support to the motor shaft, effectively suppressing vibration and misalignment. The connecting column and sealing ring work together to seal the internal cavity, preventing lubricant leakage, while simultaneously strengthening the connection rigidity between components. The side cover is secured to the sprocket body with circumferentially distributed screws, further ensuring the overall sealing and structural integrity of the assembly. Multiple weight-reducing holes reduce the sprocket's moment of inertia while maintaining strength, improving the engine's response speed. Attached Figure Description

[0014] Figure 1 A three-dimensional structural diagram of a sprocket used in an automobile engine;

[0015] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3A schematic diagram of the sprocket body connection for a sprocket used in an automobile engine;

[0017] Figure 4 A three-dimensional disassembled schematic diagram of an anti-loosening component for a sprocket used in an automobile engine;

[0018] Figure 5 This is a three-dimensional disassembled schematic diagram of an anti-loosening component for a sprocket used in an automobile engine.

[0019] In the diagram: 1. Sprocket body; 11. Sprocket teeth; 12. Arc-shaped protrusion; 13. Inclined groove; 14. Weight reduction hole; 15. Inner trapezoidal surface; 2. Motor shaft; 3. Anti-loosening component; 31. Bearing; 32. Connecting column; 33. Sealing ring; 34. Side cover. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] Please see Figure 1 As shown, this utility model provides a technical solution: a sprocket for an automobile engine, including a sprocket body 1, a motor shaft 2 for driving the sprocket body 1 to rotate is provided at the center of the interior of the sprocket body 1, two limiting blocks are fixedly connected to the inner wall of the sprocket body 1 near the motor shaft 2, and the sprocket body 1 is tightly connected to the protrusions on the outer surface of the motor shaft 2 through the two limiting blocks, and an anti-loosening component 3 for preventing the motor shaft 2 from loosening is provided on one side of the interior of the sprocket body 1, and the anti-loosening component 3 is sleeved on the outer side of the motor shaft 2.

[0022] The sprocket body 1 is driven to rotate by a motor shaft 2 located at its center. The motor shaft 2 and the sprocket body 1 are tightly engaged by two limiting blocks and protrusions on the surface of the motor shaft 2 to ensure stable transmission. The anti-loosening component 3 is sleeved on the outside of the motor shaft 2 to prevent the motor shaft 2 from loosening during operation and to improve the reliability of the overall structure.

[0023] As one implementation method in this embodiment, please refer to Figures 1-3 As shown, multiple chain teeth 11 are fixedly connected to the outer wall of the sprocket body 1 in a circumferential arrangement. Each chain tooth 11 has an arc-shaped protrusion 12 fixedly connected to its top surface. The arc of the arc-shaped protrusion 12 matches the outer arc of the chain roller.

[0024] Multiple chain teeth 11 are evenly distributed on the outer circumference of the sprocket body 1. Each chain tooth 11 has an arc-shaped protrusion 12 on its top. The arc of the arc-shaped protrusion 12 matches the outer arc of the chain roller, which can effectively improve the meshing effect between the chain and the sprocket, reduce wear and noise, and the arc-shaped protrusion 12 can also provide an upper limit for the chain roller to prevent the chain from moving radially.

[0025] As one implementation method in this embodiment, please refer to Figures 1-3 As shown, a slanted groove 13 is provided between two adjacent chain teeth 11 of the sprocket body 1, and a plurality of weight-reducing holes 14 are provided through the circumference of the sprocket body 1. An inner trapezoidal surface 15 is provided through the center of the sprocket body 1.

[0026] An inclined groove 13 is formed between adjacent chain teeth 11 to guide the oil flow in the direction of rotation, avoiding hydraulic noise caused by oil stagnation, and enhancing the lubrication coverage of the chain teeth 11. At the same time, multiple weight-reducing holes 14 are formed circumferentially inside the sprocket body 1 to reduce the overall weight without affecting the structural strength. An inner trapezoidal surface 15 is formed through the center of the sprocket to provide a structural foundation for subsequent installation of components such as bearings 31.

[0027] As one implementation method in this embodiment, please refer to Figures 4-5 As shown, the anti-loosening component 3 includes a bearing 31, which is fixedly sleeved on the outside of the motor shaft 2 and fixedly sleeved on the inner wall of the inner hole trapezoidal surface 15.

[0028] The bearing 31 in the anti-loosening component 3 is fixedly sleeved on the outside of the motor shaft 2 and embedded in the inner wall of the inner trapezoidal surface 15. Through the supporting effect of the bearing 31, the stability of the motor shaft 2 is further enhanced, preventing it from shifting or loosening during high-speed operation.

[0029] As one implementation method in this embodiment, please refer to Figures 4-5 As shown, a connecting post 32 is fixedly sleeved on the inner center area of ​​the inner trapezoidal surface 15, and a sealing ring 33 is fixedly connected to the side of the connecting post 32 away from the bearing 31.

[0030] A connecting post 32 is fixedly sleeved in the central area of ​​the inner trapezoidal surface 15. One end of the connecting post 32 is connected to the bearing 31, and the other end is connected to the sealing ring 33. The sealing ring 33 serves to seal and connect, prevent lubricating oil leakage, and enhance the connection strength between components.

[0031] As one implementation method in this embodiment, please refer to Figures 4-5 As shown, a side cover 34 is fixedly connected to one end of the sprocket body 1 near the sealing ring 33. The side cover 34 is fixedly connected to the connecting post 32 through the sealing ring 33, and the side cover 34 and the sprocket body 1 are fixedly connected by multiple sets of circumferentially arranged screws.

[0032] A side cover 34 is installed on one end of the sprocket body 1 near the sealing ring 33. The side cover 34 is fixedly connected to the connecting post 32 through the sealing ring 33. At the same time, the side cover 34 and the sprocket body 1 are fastened by multiple sets of circumferentially distributed screws to ensure the sealing performance and assembly stability of the overall structure.

[0033] Working principle: When the sprocket is working, the motor shaft 2 is tightly engaged with the two limiting blocks on the inner wall of the sprocket body 1 through the protrusions on its outer surface, thereby effectively transmitting the rotational torque of the motor to the sprocket body 1 and driving it to rotate. The chain teeth 11 on the outer circumference of the sprocket mesh with the engine chain, and the arc-shaped protrusions 12 at the top of the chain teeth 11 fully fit with the outer circle of the chain rollers, which not only improves the meshing accuracy and reduces impact and noise, but also forms a radial constraint on the chain to prevent it from derailing during high-speed operation. The inclined grooves 13 between adjacent chain teeth 11 guide the flow of lubricating oil during rotation, improve tooth surface lubrication, and assist in heat dissipation.

[0034] The anti-loosening assembly 3 is crucial for ensuring transmission stability. Its internal bearing 31 provides radial and axial support to the motor shaft 2, effectively suppressing vibration and misalignment. The connecting column 32 and sealing ring 33 work together to seal the internal cavity, preventing lubricant leakage, while also strengthening the connection rigidity between components. The side cover 34 is secured to the sprocket body 1 with circumferentially distributed screws, further ensuring the overall sealing and structural integrity of the assembly. Multiple weight-reducing holes 14 reduce the sprocket's rotational inertia while maintaining strength, improving the engine's response speed.

[0035] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A sprocket for an automotive engine comprising a sprocket body (1), characterized in that: The sprocket body (1) has a motor shaft (2) at its center for driving the sprocket body (1) to rotate. Two limiting blocks are fixedly connected to the inner wall of the sprocket body (1) near the motor shaft (2). The sprocket body (1) is tightly connected to the protrusion on the outer surface of the motor shaft (2) through the two limiting blocks. An anti-loosening component (3) is provided on one side of the interior of the sprocket body (1) to prevent the motor shaft (2) from loosening. The anti-loosening component (3) is sleeved on the outside of the motor shaft (2).

2. A sprocket for use in an automotive engine as defined in claim 1, wherein: The outer wall of the sprocket body (1) is circumferentially connected with a plurality of chain teeth (11), and the top surface of each of the plurality of chain teeth (11) is fixedly connected with an arc-shaped protrusion (12), the arc of the arc-shaped protrusion (12) matching the outer arc of the chain roller.

3. The sprocket for an automobile engine according to claim 1, characterized in that: The sprocket body (1) has a slanted groove (13) between two adjacent chain teeth (11), and the sprocket body (1) has multiple weight-reducing holes (14) circumferentially through it. The sprocket body (1) has an inner trapezoidal surface (15) circumferentially through it at the center of it.

4. A sprocket for an automobile engine according to claim 3, characterized in that: The anti-loosening component (3) includes a bearing (31), which is fixedly sleeved on the outside of the motor shaft (2) and fixedly sleeved on the inner wall of the inner hole trapezoidal surface (15).

5. A sprocket for an automobile engine according to claim 4, characterized in that: A connecting post (32) is fixedly sleeved on the inner center area of ​​the inner trapezoidal surface (15), and a sealing ring (33) is fixedly connected on the side of the connecting post (32) away from the bearing (31).

6. A sprocket for an automobile engine according to any one of claims 1-4, characterized in that: The sprocket body (1) is fixedly connected to a side cover (34) at one end near the sealing ring (33). The side cover (34) is fixedly connected to the connecting post (32) through the sealing ring (33), and the side cover (34) and the sprocket body (1) are fixedly connected by multiple sets of circumferentially arranged screws.

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