Composite metal rubber-coated gear capable of reducing rotating speed deviation

Abstract

The utility model discloses a composite metal rubber-coated gear for reducing rotation speed deviation, which comprises a first gear, a second gear and a fixed block, the first gear is provided with a through hole, the first gear is connected with a rotating shaft through the through hole, one side of the first gear far away from the through hole is provided with a cylindrical body, the cylindrical body is provided with a second gear, and the second gear is connected with the fixed block. The second gear is made of a plastic material and is fixed on the cylindrical body in a rubber coating forming mode, the second gear abuts against the first gear, and the cylindrical body is arranged in the second gear in a penetrating mode; the part, penetrating out of the second gear, of the cylindrical body is connected with a fixing block used for limiting the position of the second gear so that the second gear and the first gear can be always kept in an abutting state. By means of the structural design, the second gear can be conveniently replaced in the using process.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission gears, in particular to a composite metal rubber-coated gear capable of reducing rotational speed deviation. Background Art

[0002] Traditional gears are usually made of a single material, either metal or plastic. Gears made of metal have a higher torque bearing capacity, but their disadvantage is that they are heavy and have relatively high manufacturing costs. Gears made of plastic are light in weight, but may not be able to withstand high torque and have certain limitations. There are currently some composite gears on the market that combine the advantages of metal gears and plastic gears and are used together in the hope of achieving better performance. However, these composite gears may have unstable connections after long-term use. Specifically, the unstable connection between metal gears and plastic gears may cause a deviation in speed. This deviation will further affect the transmission accuracy of the gears, thereby affecting the overall transmission performance.

[0003] In the prior art, for example, a Chinese utility model patent (publication number CN221221343U) discloses a new type of metal-coated gear, which achieves a stable connection and precise transmission between a first gear and a second gear by optimizing the design of the gear structure. Specifically, the gear system consists of a first gear, a second gear, a connecting structure, and a fixing structure. The first gear is connected to one end of the connecting structure through a first through-hole, and the first through-hole is connected to a second through-hole on the connecting structure to form a through-hole. The fixing structure is arranged at the end of the connecting structure away from the first gear, while the second gear is arranged on the connecting structure, located outside the fixing structure. The connecting structure is designed as a cylindrical body, and the second through-hole passes through the cylindrical body. The first gear and the cylindrical body are made of metal and are integrally molded to ensure sufficient strength and stability. The fixing structure is a polygonal fixing plate, which is fixed to the end of the cylindrical body away from the first gear. The second gear is made of plastic and is fixed to the outside of the cylindrical body and the polygonal fixing plate by overmolding, and abuts against the first gear. This design prevents speed deviations between the first and second gears due to unstable connections, even after prolonged use. This prevents errors in transmission accuracy and ensures transmission stability and reliability. Furthermore, the fixed structure includes a limit plate, a first tilting block, and a second tilting block. These components further restrict the position of the second gear, ensuring it does not shift even after prolonged use, further safeguarding transmission accuracy.

[0004] However, the drawback of the above-mentioned prior art is that, during use, once the second gear is damaged, the process of removing it is complicated, and the connecting mechanism of the first gear may be bent during the removal process, thereby rendering the entire mechanism unable to be reused.

[0005] Therefore it is necessary to improve the existing technology. Utility Model Content

[0006] In response to the above problem, a composite metal rubber-coated gear for reducing speed deviation is provided, comprising a first gear, a second gear and a fixed block. A through-hole is provided on the first gear, through which the first gear is connected to the rotating shaft. A cylindrical body is provided on the side of the first gear away from the through-hole, and a second gear is provided on the cylindrical body. The second gear is made of plastic and is fixed to the cylindrical body by rubber-coated molding. The second gear is in contact with the first gear, and the cylindrical body is passed through the second gear. The cylindrical body passes through the second gear part and is connected to a fixed block for limiting the position of the second gear so that the second gear and the first gear always remain in contact.

[0007] Preferably, a limit block is provided on the cylindrical body, and the second gear and the first gear will not rotate relative to each other due to the limitation of the limit block.

[0008] Preferably, the first gear and the cylindrical body are made of metal and are integrally formed.

[0009] Preferably, the first gear is a spur gear.

[0010] Preferably, the second gear is a helical gear.

[0011] Preferably, a threaded hole is provided on the cylindrical body, and a through hole is provided on the fixing block. In an initial state, a bolt passes through the through hole, and the fixing block and the cylindrical body are tightly fitted through the threaded hole.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. By utilizing a metal first gear and cylindrical body, and achieving an integrated molding process, this new design significantly improves the mechanical strength and durability of the gears. This design not only ensures stability under high loads but also reduces deformation caused by prolonged operation, effectively reducing speed deviation and improving the accuracy and reliability of the transmission system. Furthermore, the high rigidity of the metal material helps maintain performance in harsh operating environments or temperature fluctuations, extending the gear's service life.

[0014] 2. The second gear in this utility model is made of plastic and secured to the metal cylinder through overmolding. This composite material ensures a close fit with the first gear and efficient power transmission while maintaining its lightweight. The helical gear design further reduces impact and noise, providing smoother transmission performance. If damaged, the second gear can be quickly removed and replaced, significantly improving gear maintenance efficiency.

[0015] 3. The threaded holes in the cylindrical body of the present invention, combined with the through-holes in the fixing block, provide a simple and reliable fixing method. Bolts passing through the through-holes and tightening into the threaded holes ensure that the fixing block is tightly attached to the cylindrical body, thereby precisely defining the position of the second gear, preventing relative rotation between the gears and reducing speed deviation. This design allows for easy removal and reinstallation of the fixing block, facilitating maintenance or replacement of the second gear, further improving the maintainability and service life of the gear system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a three-dimensional schematic diagram from the first gear perspective of a composite metal rubber-coated gear for reducing speed deviation.

[0017] Figure 2 The present invention is a three-dimensional schematic diagram of a composite metal rubber-coated gear for reducing speed deviation from the second gear perspective.

[0018] Figure 3 An exploded view of a composite metal-coated gear that reduces speed deviation.

[0019] Figure 4 The present invention is a three-dimensional schematic diagram of a composite metal rubber-coated gear for reducing speed deviation after the second gear is disassembled.

[0020] Figure 5 A side view of a composite metal-coated gear that reduces speed deviation.

[0021] Figure 6 It is a composite metal coated gear that reduces speed deviation. Figure 5 Cross-sectional view of AA in the figure.

[0022] The numbers in the figure are: 1, first gear; 11, through hole; 12, cylindrical body; 121, limit block; 122, threaded hole; 2, second gear; 3, fixing block; 4, bolt. DETAILED DESCRIPTION

[0023] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is described in further detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Reference Figures 1-6 : A composite metal rubber-coated gear for reducing speed deviation includes a first gear 1, a second gear 2 and a fixed block 3. A through-hole 11 is provided on the first gear 1, and the first gear 1 is connected to the rotating shaft through the through-hole 11. A cylindrical body 12 is provided on the side of the first gear 1 away from the through-hole 11, and a second gear 2 is provided on the cylindrical body 12. The second gear 2 is made of plastic and is fixed to the cylindrical body 12 by rubber-coated molding. The second gear 2 is in contact with the first gear 1, and the cylindrical body 12 is passed through the second gear 2. The part of the cylindrical body 12 passing through the second gear 2 is connected with a fixed block 3 for limiting the position of the second gear 2 so that the second gear 2 and the first gear 1 always maintain an abutment state.

[0025] The second gear 2 made of plastic in the prior art is not easy to remove after being damaged, and the consequence of forcibly removing it may affect the first gear 1. In response to the above problem, in the present invention, the gear system consists of a first gear 1 and a second gear 2. The first gear 1 is connected to the rotating shaft through the through-hole 11 thereon to achieve power transmission. On the side of the first gear 1 away from the through-hole 11, there is a cylindrical body 12 connected, and the second gear 2 is fixed on the cylindrical body 12. The gear is made of plastic and is fixed to the cylindrical body 12 through the overmolding technology. The second gear 2 and the first gear 1 are in contact with each other to form a tight transmission fit. The cylindrical body 12 not only supports the second gear 2, but also penetrates the second gear 2, and the part that penetrates is connected to a fixed block 3. The function of the fixed block 3 is to limit the position of the second gear 2, ensuring that the second gear 2 always maintains an abutment state with the first gear 1 during use, avoiding position deviation caused by long-term use or load changes, thereby reducing speed deviation and maintaining transmission accuracy. Furthermore, if the second gear 2 becomes damaged, it can be removed from the cylindrical body 12 by removing the fixing block 3. The fixing block 3 can then be reinstalled and overmolded, enabling quick replacement of the second gear 2. This improves gear maintenance efficiency and service life. The entire design, through ingenious structural layout and material application, achieves high efficiency, high precision, and easy maintenance for the gear transmission.

[0026] Reference Figure 1-Figure 4 : A limit block 121 is provided on the cylindrical body 12. Due to the limitation of the limit block 121, the second gear 2 and the first gear 1 will not rotate relative to each other.

[0027] The function of the limit block 121 is to prevent relative rotation between the second gear 2 and the first gear 1, ensuring that the two gears always maintain a consistent speed during the transmission process. Through the fixing effect of the limit block 121, the speed deviation caused by relative sliding or rotation between the gears can be avoided, thereby improving the reliability and efficiency of the transmission system. Specifically, the limit block 121 is tightly combined with the cylindrical body 12, and through its structural design, it applies an appropriate restraining force to the second gear 2, so that it is firmly fixed on the cylindrical body 12, while maintaining a close abutment state with the first gear 1. This design not only ensures the synchronous rotation between the gears, but also helps to reduce the transmission error caused by friction or wear between the gears. In addition, the presence of the limit block 121 also helps to improve the overall rigidity of the gear structure, enabling it to withstand greater loads and more complex working conditions, further enhancing the durability and stability of the gear. Through this sophisticated design, the composite metal-coated gear can provide more reliable and efficient transmission performance in various application scenarios.

[0028] Reference Figure 1-Figure 4 : The first gear 1 and the cylindrical body 12 are made of metal and are integrally formed.

[0029] Both the first gear 1 and the cylindrical body 12 are made of metal, leveraging the high strength and durability of metal to enhance the overall performance of the gear. The metal first gear 1 is connected to the rotating shaft via a perforation 11, ensuring efficient power transmission and maintaining structural stability during rotation. The cylindrical body 12, a key component that connects and supports the second gear 2, is also made of metal, providing the necessary mechanical strength and ensuring reliability under high loads. The combination of the metal first gear 1 and cylindrical body 12 ensures excellent durability and stability under high torque and speed conditions. Furthermore, the high rigidity of metal helps minimize deformation caused by load fluctuations or long-term operation, maintaining precise fit between gears and minimizing speed deviation. This design also ensures that the gear maintains its performance even in harsh operating environments or temperature fluctuations, extending its service life. By designing the first gear 1 and cylindrical body 12 of metal, the gear can withstand greater loads while maintaining transmission accuracy and efficiency under various operating conditions. This is particularly important for industrial applications requiring high-precision and high-reliability transmission systems.

[0030] Reference Figure 1 : The first gear 1 is a spur gear.

[0031] The first gear 1 is designed as a spur gear. Its operating principle is to achieve direct meshing with the rotating shaft through the even distribution of spur teeth. The spur gear design allows for smooth and continuous power transmission during rotation, while maintaining structural simplicity and ease of manufacturing. Because the spur gear's tooth profile is straight, it achieves uniform load distribution when meshing with the corresponding gear, reducing localized stress concentration, thereby improving the gear's load capacity and transmission efficiency.

[0032] Reference Figure 1 : The second gear 2 is a helical gear.

[0033] The second gear 2 is designed as a helical gear, characterized by its helical teeth, which provide different transmission characteristics than spur gears. The helical tooth profile of a helical gear allows the contact point to gradually shift from one end to the other during meshing, achieving gradual engagement and disengagement. This gradual meshing process helps reduce shock and noise while providing smoother power transmission. Another advantage of helical gears is that they generate axial thrust, facilitating automatic alignment and further ensuring precise fit between gears. Due to their tooth profile design, helical gears can withstand greater axial forces during transmission, increasing their load-bearing capacity. In the composite metal-coated gear design, the second helical gear is made of plastic and secured to a metal cylindrical body 12 through overmolding. This material choice ensures that the second gear 2 maintains its lightweight while also achieving efficient power transmission through meshing with the first spur gear. A stopper 121 is provided on the cylindrical body 12 to prevent relative rotation between the second and first helical gears, maintaining stable transmission between them. The helical gear design also helps improve gear efficiency by enabling higher torque transmission without adding additional space. Furthermore, the helical shape of the helical gears facilitates better lubrication and heat dissipation, extending gear life. Overall, the design of the second helical gear plays a key role in the composite metal-coated gear. Its unique tooth profile and material properties work in synergy with the first straight gear to reduce speed deviation and improve transmission stability and efficiency.

[0034] Reference Figure 1-Figure 4 : A threaded hole 122 is provided on the cylindrical body 12, and a through hole is provided on the fixing block 3. In the initial state, the bolt 4 passes through the through hole and the fixing block 3 is tightly fitted to the cylindrical body 12 through the threaded hole 122.

[0035] A threaded hole 122 is provided on the cylindrical body 12, and a through hole is provided on the fixing block 3. This design allows the bolt 4 to pass through the through hole of the fixing block 3, and then the fixing block 3 and the cylindrical body 12 are tightly fitted together through the threaded hole 122 on the cylindrical body 12. The working principle of this structure is to use the tightening effect of the bolt 4 to ensure that the position of the fixing block 3 on the cylindrical body 12 is stable, thereby accurately defining the position of the second gear 2. The combination of the threaded hole 122 and the through hole not only provides a simple and reliable fixing method, but also allows the fixing block 3 to be easily disassembled when necessary to facilitate maintenance or replacement of the second gear 2. When the bolt 4 is tightened, it generates an axial force in the threaded hole 122, which is transmitted to the fixing block 3 through the bolt 4, so that the fixing block 3 is tightly attached to the cylindrical body 12, ensuring that the second gear 2 does not undergo axial or radial displacement during the transmission process.

[0036] The above embodiments merely represent one or several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A composite metal rubber-coated gear for reducing speed deviation, characterized in that: The invention comprises a first gear (1), a second gear (2) and a fixing block (3); a through-hole (11) is provided on the first gear (1); the first gear (1) is connected to a rotating shaft through the through-hole (11); a cylindrical body (12) is provided on the side of the first gear (1) away from the through-hole (11); a second gear (2) is provided on the cylindrical body (12); the second gear (2) is made of plastic and is fixed to the cylindrical body (12) by means of overmolding; the second gear (2) is in contact with the first gear (1); the cylindrical body (12) is passed through the second gear (2); a fixing block (3) is connected to the part of the cylindrical body (12) passing through the second gear (2) for limiting the position of the second gear (2) so that the second gear (2) and the first gear (1) are always kept in contact.

2. A composite metal rubber-coated gear for reducing speed deviation according to claim 1, characterized in that: A limiting block (121) is provided on the cylindrical body (12), and due to the limitation of the limiting block (121), the second gear (2) and the first gear (1) will not rotate relative to each other.

3. The composite metal rubber-coated gear for reducing speed deviation according to claim 1, characterized in that: The first gear (1) and the cylindrical body (12) are made of metal and are integrally formed.

4. The composite metal rubber-coated gear for reducing speed deviation according to claim 1, characterized in that: The first gear (1) is a spur gear.

5. The composite metal rubber-coated gear for reducing speed deviation according to claim 1, characterized in that: The second gear (2) is a helical gear.

6. The composite metal rubber-coated gear for reducing speed deviation according to claim 1, characterized in that: The columnar body (12) is provided with a threaded hole (122), and the fixing block (3) is provided with a through hole. In an initial state, the bolt (4) passes through the through hole, and the fixing block (3) and the columnar body (12) are tightly fitted through the threaded hole (122).

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