Speed increasing mechanism and speed increasing box

Abstract

The utility model discloses a speed increasing mechanism and a speed increasing box. The speed increasing mechanism comprises an input shaft, an output shaft, a duplicate gear, a power input gear and a power output gear. The input shaft and the output shaft are coaxially arranged; the duplicate gear comprises a first gear and a second gear, and the first gear and the second gear are coaxially and fixedly connected; the transmission ratio of the power input gear to the first gear and the transmission ratio of the second gear to the power output gear are smaller than and equal to each other. According to the speed increasing mechanism, two-stage speed increasing transmission is achieved through the arrangement of the duplicate gear, the two-stage speed increasing transmission ratio is consistent through the duplicate gear structure and the setting of parameters of the first gear and the second gear, and coaxial arrangement of the power input shaft and the power output shaft is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of speed increasers, and in particular to a speed increasing mechanism and a speed increaser. Background Art

[0002] A speed increaser is a common speed increasing device and is widely used in household cookers, soybean milk machines, juice machines, wall breakers, etc. In the existing speed increasing structure in a speed increaser, it is difficult to coaxially arrange the power input shaft and the power output shaft, and there is a speed ratio difference between the power input shaft and the power output shaft, resulting in low transmission efficiency and a complex transmission structure. Summary of the Utility Model

[0003] In order to overcome at least one of the above-mentioned defects of the prior art, one of the purposes of the present utility model is to provide a speed increasing mechanism. By setting a double gear, two-stage speed increasing transmission is realized, and through the setting of the double gear structure and the parameters of the first gear and the second gear, the two-stage speed increasing transmission ratios are made consistent, and the coaxial arrangement of the power input shaft and the power output shaft is realized.

[0004] In order to overcome at least one of the above-mentioned defects of the prior art, the second purpose of the present utility model is to provide a speed increaser. This speed increaser adopts the aforementioned speed increasing mechanism to realize coaxial connection and transmission of the input shaft and the output shaft, with stable power output and a long service life.

[0005] The technical solution adopted by the present utility model to solve its problems is as follows:

[0006] A speed increasing mechanism includes an input shaft, an output shaft, a double gear, a power input gear fixedly installed on the input shaft, and a power output gear fixedly installed on the output shaft; the input shaft and the output shaft are coaxially arranged;

[0007] The double gear includes a first gear and a second gear, and the first gear and the second gear are coaxially and fixedly connected;

[0008] The first gear and the second gear are respectively meshed with the power input gear and the power output gear, and the transmission ratio of the power input gear to the first gear is less than 1, and the transmission ratio of the second gear to the power output gear is less than 1; and the transmission ratio of the power input gear to the first gear is equal to the transmission ratio of the second gear to the power output gear.

[0009] Furthermore: the module and the number of teeth of the power input gear and the second gear are respectively equal, and the module and the number of teeth of the first gear and the power output gear are respectively equal.

[0010] Further: A first bearing is provided between the input shaft and the output shaft; the input shaft is coaxially connected to the outer ring of the first bearing, and the output shaft is coaxially connected to the inner ring of the first bearing; or, the output shaft is coaxially connected to the outer ring of the first bearing, and the input shaft is coaxially connected to the inner ring of the first bearing.

[0011] Further: An installation hole is coaxially provided on the power input gear, the first bearing is coaxially sleeved in the installation hole, and the fixed outer ring of the first bearing is fixedly connected to the inner wall of the installation hole, and the output shaft is fixedly connected to the inner ring of the first bearing.

[0012] Further: Second bearings and third bearings are respectively sleeved on the ends of the input shaft and the output shaft away from the first bearing.

[0013] Further: Both the power input gear and the power output gear are helical gears with opposite helix directions, and both the first gear and the second gear are helical gears with opposite helix directions.

[0014] Further: When the first gear meshes with the power input gear, it is subjected to an axial force towards the second gear, and when the second gear meshes with the power output gear, it is subjected to an axial force towards the first gear.

[0015] Further: The speed increasing mechanism further includes a fixed column, and the first gear and the second gear are coaxially sleeved on the fixed column and rotate relative to the fixed column.

[0016] Further: There are at least two sets of the double gears, and each set of double gears is evenly distributed around the power input gear.

[0017] A speed increasing box includes the aforementioned speed increasing mechanism and a box body for installing the speed increasing mechanism, and the input shaft and the output shaft respectively extend out of the box body;

[0018] Both the second bearing and the third bearing are installed on the box body;

[0019] The fixed column is fixedly installed on the box body.

[0020] In summary, a speed increasing mechanism provided by the present utility model has the following technical effects:

[0021] 1. By setting a double gear, combining a power input gear and a power output gear, two-stage speed increase transmission is achieved, and the transmission ratios of the two-stage speed increase transmission are equal, realizing that the input shaft and the output shaft are coaxially arranged and transmitted on the same axis. The coaxial arrangement and coaxial transmission of the input shaft and the output shaft make the power transmission more direct, with less energy loss during transmission, improving the transmission efficiency. At the same time, it also makes the power transmission more stable, reducing vibration and noise during transmission.

[0022] 2. By setting a first bearing, and both the input shaft and the output shaft are fixedly connected to the first bearing at the same time, and the input shaft and the output shaft are respectively fixedly connected to the bearing outer ring and the bearing inner ring of the first bearing, realizing the coaxial connection of the input shaft and the output shaft, and avoiding the problem of cantilever transmission of the input shaft and the output shaft.

[0023] 3. When the first gear meshes with the power input gear, it is subjected to an axial force towards the second gear. When the second gear meshes with the power output gear, it is subjected to an axial force towards the first gear. When the double gear is in transmission, it is subjected to two opposite axial forces, which can cancel each other out, enabling the double gear to maintain a centered position during transmission and reducing wear on the installation positions at both ends.

[0024] In summary, a speed increasing box provided by the present utility model has the following technical effects:

[0025] This speed increasing box applies the aforementioned speed increasing mechanism, with a compact structure, stable power output, and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of an embodiment of a speed increasing mechanism of the present utility model.

[0027] Figure 2 For Figure 1 The front view of a speed increasing mechanism in

[0028] Figure 3 For Figure 1 The exploded view of a speed increasing mechanism in

[0029] Figure 4 It is a schematic structural diagram of an embodiment of a speed increasing box of the present utility model.

[0030] Figure 5 For Figure 4 The internal structural schematic diagram of a speed increasing box in

[0031] Figure 6 For Figure 4 The schematic diagram of another perspective of the internal structure of a speed increasing box in

[0032] Among them, the meanings of the reference numerals are as follows:

[0033] 100, Speed increasing mechanism; 200, Housing; 201, Positioning surface; 300, Speed increasing box;

[0034] 10, First bearing; 1, Input shaft; 11, Power input gear; 111, Mounting hole; 12, Second bearing; 2, Output shaft; 21, Power output gear; 22, Third bearing; 3, Double gear; 31, First gear; 32, Second gear; 33, Fixed column; 3a, Double gear two. Detailed implementation mode

[0035] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

[0038] Refer to Figures 1 to 3 , the present invention discloses a speed increasing mechanism 100, which is mostly used in small household appliances, such as juicers, blenders, soy milk makers, etc. In the speed increasing mechanism 100, by using a double gear 3, the problem that it is difficult to coaxialize the power input shaft and the power output shaft of the speed increasing mechanism on small household appliances in the prior art and achieve stable transmission is solved. The speed increasing mechanism 100 will be introduced in detail below.

[0039] As Figure 1 shown, a speed increasing mechanism 100 includes an input shaft 1, an output shaft 2, a double gear 3, a power input gear 11 fixedly installed on the input shaft 1, and a power output gear 21 fixedly installed on the output shaft 2. The input shaft 1 and the output shaft 2 are coaxially arranged.

[0040] The double gear 3 includes a first gear 31 and a second gear 32, and the first gear 31 and the second gear 32 are coaxially and fixedly connected.

[0041] The first gear 31 and the second gear 32 are respectively meshed with the power input gear 11 and the power output gear 21. The transmission ratio between the power input gear 11 and the first gear 31 is less than 1, and the transmission ratio between the second gear 32 and the power output gear 21 is less than 1. Moreover, the transmission ratio between the power input gear and the first gear is equal to the transmission ratio between the second gear and the power output gear.

[0042] In the above solution, the double gear 3 includes a first gear 31 and a second gear 32, and the first gear 31 and the second gear 32 are coaxially and fixedly connected, so that the rotational speeds of the first gear 31 and the second gear 32 are equal.

[0043] In the above solution, through the meshing transmission of the double gear 3 with the power input gear 11 and the power output gear 21 respectively, the two-stage transmission from the power input gear 11 to the power output gear 21 is realized. The transmission ratio between the power input gear 11 and the first gear 31 is less than 1, and the transmission ratio between the second gear 32 and the power output gear 21 is less than 1. That is, in the two-stage transmission, the transmission ratio is less than 1, achieving the purpose of increasing the speed from the power input gear 11 to the power output gear 21. The transmission ratio between the power input gear and the first gear is equal to the transmission ratio between the second gear and the power output gear, making the two-stage speed increase transmission ratio consistent and realizing the coaxial setting of the power input shaft and the power output shaft.

[0044] In the above solution, the input shaft and the output shaft are coaxially arranged and driven on the same axis, making the power transmission more direct, with less energy loss during transmission, improving the transmission efficiency. At the same time, it also makes the power transmission more stable, reducing the vibration and noise during transmission and reducing the unbalanced force caused by non-coaxiality.

[0045] In the above solution, the input shaft and the output shaft are coaxially arranged and driven on the same axis. The coaxial setting of the input shaft and the output shaft makes the speed increasing mechanism more compact, saving the space of the speed increasing mechanism and reducing the volume of the speed increasing box using this speed increasing mechanism, realizing the miniaturization and light weight of the speed increasing box.

[0046] In the above solution, the input shaft and the output shaft are coaxially arranged and driven on the same axis, simplifying the structural design of the speed increasing mechanism, making the installation and maintenance of the speed increasing mechanism simpler and more convenient. The input shaft and the output shaft are on the same axis, making it easy to align and adjust the input shaft and the output shaft.

[0047] In the above solution, the rotational speeds of the first gear and the second gear are equal. Generally, the means is to fixedly install both the first gear and the second gear on the same shaft, or coaxially and fixedly connect the first gear and the second gear. In this solution, as Figure 1As shown, the first gear and the second gear are coaxially fixedly connected, that is, the first gear and the second gear are integrally formed. The integral formation of the first gear and the second gear simplifies the transmission connection between the first gear and the second gear, simplifies the structure of the double gear, improves the assembly accuracy of the double gear itself, reduces the overall assembly difficulty of the speed increasing mechanism, and improves the overall assembly accuracy of the speed increasing mechanism.

[0048] To facilitate the understanding of the above two-stage transmission by those skilled in the art, a double gear structure with specific parameters is given below. That is, in a specific embodiment, the number of teeth of the first gear of the double gear is 15, the number of teeth of the second gear is 24, and the outer diameters of the power input gear and the second gear are equal and the number of teeth of both is 24. The outer diameters of the first gear and the power output gear are equal and the number of teeth of both is 15. When this speed increasing mechanism is working, the input shaft is connected to the output shaft of the motor, and the rotation speed of the motor is 12000 RPM. Then, the transmission ratio of the power input gear to the first gear is equal to the transmission ratio of the second gear to the power output gear, both of which are equal to 15 / 24, that is, 0.625. Then, the rotation speed of the first gear is [12000 / (15 / 24)] RPM, that is, 19200 RPM. Then, the rotation speed of the power output gear is [192000 / (15 / 24)] RPM, that is, 30720 RPM.

[0049] In this technical solution, in order to make the transmission ratio of the power input gear 11 to the first gear 31 equal to the transmission ratio of the second gear 32 to the power output gear 21, the adopted solution can be that the module and the number of teeth of the power input gear 11 and the second gear 32 are respectively equal, and the module and the number of teeth of the first gear 31 and the power output gear 21 are respectively equal. In the two-stage transmission, the module, the number of teeth and the outer diameter of the transmission gears are respectively equal, realizing the coaxial setting of the input shaft and the output shaft and the coaxial line transmission.

[0050] In this technical solution, in order to ensure the coaxial setting of the input shaft and the output shaft and the coaxial line transmission, a first bearing 10 is arranged between the input shaft 1 and the output shaft 2, and the input shaft 1 is coaxially connected to the bearing outer ring of the first bearing 10, and the output shaft 2 is coaxially connected to the bearing inner ring of the first bearing 10; or, the output shaft 2 is coaxially connected to the bearing outer ring of the first bearing 10, and the input shaft 1 is coaxially connected to the bearing inner ring of the first bearing 10.

[0051] In the above solution, by arranging the first bearing and connecting both the input shaft and the output shaft to the first bearing, on the one hand, the coaxial setting and the coaxial line transmission of the input shaft and the output shaft are realized. On the other hand, through the setting of the first bearing, the installation of the input shaft and the output shaft is realized, avoiding the problem of cantilever transmission at the adjacent ends of the input shaft and the output shaft during transmission, ensuring the installation of the adjacent ends of the output shaft and the output shaft, and reducing the problem of swing when the input shaft and the output shaft rotate at high speed during work.

[0052] In the above solution, it is acceptable for either the input shaft or the output shaft to be connected to the outer ring of the first bearing. When the outer ring of the first bearing is connected to one of the input shaft and the output shaft, the inner ring of the first bearing is connected to the other of the input shaft and the output shaft. Preferably, the outer ring of the first bearing is coaxially and fixedly connected to one of the input shaft and the output shaft, and the inner ring of the first bearing is coaxially and fixedly connected to the other of the input shaft and the output shaft.

[0053] In the above solution, by connecting both the input shaft and the output shaft to the first bearing, the installation structure of the input shaft and the output shaft is simplified. Meanwhile, the connection structure of the input shaft and the output shaft is made compact, the alignment operation during the coaxial installation of the input shaft and the output shaft is avoided, and the error in the coaxial installation of the input shaft and the output shaft is reduced or even eliminated.

[0054] In the above solution, by connecting both the input shaft and the output shaft to the first bearing, combined with the transmission and speed increase of the double - joint gear 3, the transmission of the output shaft is made stable, the jitter of the output shaft is reduced, and the power output of the output shaft is made stable.

[0055] In this technical solution, in order to further miniaturize this speed - increasing mechanism, an installation hole 111 is coaxially provided on the power - input gear 11. The first bearing 10 is coaxially sleeved in the installation hole 111, and the fixed outer ring of the first bearing 10 is fixedly connected to the inner wall of the installation hole 111. The output shaft 2 is fixedly connected to the inner ring of the first bearing 10.

[0056] In the above solution, an installation hole 111 is coaxially provided on the power - input gear 11, and the first bearing is arranged in the installation hole. The outer ring of the first bearing is matched with the installation hole, so that the first bearing is installed in the installation hole. Preferably, the outer ring of the first bearing is coaxially and fixedly installed with the installation hole. The provision of the installation hole realizes the installation of the first bearing, eliminating a fixed bracket originally required for installing the input shaft or the output shaft and another bearing in the speed - increasing mechanism. At the same time, the overall height of the speed - increasing mechanism is shortened, the height of the speed - increasing box is reduced, and the height of the speed - increasing box is reduced by at least about 20 mm, saving costs, optimizing the assembly difficulty, and optimizing the coaxial assembly accuracy of the input shaft and the output shaft.

[0057] In this technical solution, second bearings 12 and third bearings 22 are respectively sleeved on the ends of the input shaft 1 and the output shaft 2 that are far from the first bearing 10. The second bearings 12 and the third bearings 22 respectively realize the installation of the input shaft and the output shaft at the separated ends, avoiding the problem of cantilever drive of the input shaft and the output shaft, improving the rotational stability of the input shaft and the output shaft, and especially ensuring the stable output of the rotational motion of the output shaft.

[0058] In this technical solution, the power input gear 11 and the power output gear 21 are both helical gears with opposite rotation directions, and the first gear 31 and the second gear 32 are both helical gears with opposite rotation directions.

[0059] In the above scheme, both the power input gear 11 and the power output gear 21 utilize helical gear transmission, which offers excellent meshing performance, a compact structure, smooth transmission, and low transmission noise. In the above scheme, both the power input gear 11 and the power output gear 21 utilize helical gears. Through the dual-gear transmission, the output shaft's rotational direction is adjusted to the same direction as the input shaft, reducing the relative speed between the inner and outer rings of the first bearing, reducing wear on the balls in the first bearing, and extending the service life of the first bearing. Therefore, in the above scheme, the dual gear 3 can adjust the rotational direction of the output shaft and the input shaft, extending the service life of the entire speed-increasing mechanism.

[0060] In this technical solution, the first gear 31 is subjected to an axial force toward the second gear 32 when meshing with the power input gear 11 , and the second gear 32 is subjected to an axial force toward the first gear 31 when meshing with the power output gear 21 .

[0061] In the above scheme, the first gear and the second gear in the double gear 3 are subjected to opposite axial forces when they are engaged with the power input gear 11 and the power output gear 21 respectively. The two opposite axial forces cancel each other out, so that the double gear 3 can be maintained in the middle or relatively middle position along its axial direction during operation, which can reduce or eliminate the wear of the installation positions of the two ends of the double gear 3, ensure the stability of the double gear transmission, and extend the service life of the double gear and the speed increaser box for installing the double gear.

[0062] like Figure 1In this case, the first gear and the second gear are coaxially and fixedly connected and then coaxially sleeved on the fixed column 33. When the first gear rotates, the fixed column 33 remains stationary, so that the second gear sleeved on the fixed column 33 has the same angular velocity as the first gear, that is, the first gear and the second gear have the same rotational speed. The first gear and the second gear are coaxially sleeved on the fixed column 33 to achieve the installation of the first gear and the second gear. After the first gear and the second gear are coaxially sleeved on the fixed column 33, in the transmission between the first gear and the second gear, the first gear and the second gear in the form of helical gears will be subject to axial forces during transmission. To prevent the first gear and the second gear from being pressed towards one end of the double gear by the driving action of the axial force, causing wear to the positioning surface 201 at one end of the double gear, in the above solution, when the first gear 31 meshes with the power input gear 11, it is subject to an axial force towards the second gear 32, and when the second gear 32 meshes with the power output gear 21, it is subject to an axial force towards the first gear 31. During the transmission of the double gear, the first gear and the second gear are subject to opposite axial forces, enabling the double gear to maintain a centered or relatively centered position on the positioning column 33 and preventing the double gear from causing wear to the positioning surface 201 at one or both ends of the fixed column 33.

[0063] As Figure 5 and Figure 6 shown, the positioning surface 201 is used to fix the positioning column 33 and for installing the double gear. After the double gear is installed, the positioning surfaces 201 at both ends of the fixed column are in contact with the outer end surfaces of the first gear or the second gear. After the double gear is subject to opposite axial forces, the outer end surfaces of the first gear and the second gear no longer contact the positioning surface or the friction force between them decreases, extending the service life of the double gear and the installation position of the double gear, improving the overall accuracy and installation accuracy of the double gear, and ensuring stable and reliable power transmission.

[0064] For the convenience of those skilled in the art to further understand the solution that "when the first gear 31 meshes with the power input gear 11, it is subject to an axial force towards the second gear 32, and when the second gear 32 meshes with the power output gear 21, it is subject to an axial force towards the first gear 31", the following is an example in combination with Figure 2 for illustration.

[0065] When the power input gear is a left-handed gear and rotates counterclockwise, the first gear is a right-handed gear and rotates clockwise, the second gear is a left-handed gear and rotates clockwise, and the power output gear is a right-handed gear and rotates counterclockwise; at this time, during meshing transmission, the power input gear and the first gear are respectively subject to axial forces towards the power output gear and the second gear, and the power output gear and the second gear are respectively subject to axial forces towards the power input gear and the first gear.

[0066] When the power input gear is a right-handed gear and the rotation direction is clockwise, the first gear is a left-handed gear and the rotation direction is counterclockwise, the second gear is a right-handed gear and the rotation direction is counterclockwise, and the power output gear is a left-handed gear and the rotation direction is clockwise; when meshing and transmitting power at this time, the power input gear and the first gear are also respectively subjected to axial forces towards the power output gear and the second gear, and the power output gear and the second gear are also respectively subjected to axial forces towards the power input gear and the first gear.

[0067] According to the above description, both the power input gear 11 and the power output gear 21 are helical gears with opposite helix directions, and both the first gear 31 and the second gear 32 are helical gears with opposite helix directions. When the first gear and the second gear are respectively engaged with the power input gear and the power output gear for power transmission, the power input gear and the power output gear are also helical gears with opposite helix directions and the same rotation direction. When the rotation directions of the power input gear and the power output gear are the same, the rotation directions of the input shaft 1 and the output shaft 2 are the same. The input shaft and the output shaft are coaxially arranged through the first bearing and achieve coaxial transmission. The rotational speed of the output shaft is increased several times compared with the rotational speed of the input shaft. When the rotation direction of the output shaft is the same as that of the input shaft, the relative rotational speed between the inner ring and the outer ring of the first bearing is the difference between the rotational speed of the output shaft and the rotational speed of the input shaft, reducing the relative speed between the inner ring and the outer ring of the first bearing, reducing the wear of the balls in the first bearing, and extending the service life of the first bearing.

[0068] Similarly, when the first gear and the second gear are subjected to axial forces towards each other, the power input gear 11 and the power output gear 21 are also respectively subjected to axial forces. The axial force received by the power input gear 11 is towards the power output gear, while the axial force received by the power output gear is towards the power input gear. In this way, the input shaft and the power input gear 11 and the output shaft and the power output gear 21 are also maintained in the middle position, effectively reducing the wear of the input shaft, the power input gear 11, the output shaft, and the power output gear 21 on the installation position.

[0069] In this technical solution, there are at least two sets of double gears 3, and each set of double gears 3 is evenly distributed around the power input gear 11. As Figure 2 shown, a second double gear 3a is also provided at the relative position of the double gear 3. Of course, more double gears can also be provided, and each double gear is evenly distributed around the power input gear and / or the power output gear. The uniform arrangement of multiple sets of double gears makes the transmission forces received by the power input gear 11 and the power output gear 21 balanced, the transmission between the power input gear 11 and the power output gear 21 stable, and the power output of the output shaft stable. In addition, the uniform arrangement of multiple sets of double gears can also increase the bearing capacity of the output shaft and improve the output torque of the output shaft.

[0070] This solution also proposes a speed increasing gearbox 300. This speed increasing gearbox 300 includes the aforementioned speed increasing mechanism 100 and a housing 200 for mounting the speed increasing mechanism 100. The input shaft 1 and the output shaft 2 each extend from the housing 200, facilitating the installation and connection of the speed increasing gearbox with external structures. The second bearing 12 and the third bearing 22 are both mounted on the housing 200, securing the second and third bearings and enabling the installation of the input and output shafts, thereby avoiding the problem of cantilever transmission of the input and output shafts during transmission.

[0071] In this embodiment, the fixing post 33 is fixedly mounted to the housing 200 to achieve the installation and positioning of the duplex gears. Specifically, the fixing post 33 is integrally formed with the housing, which improves the strength of the fixing post 33, optimizes the installation accuracy of the fixing post, and reduces and improves the installation accuracy of the duplex gears coaxially sleeved on the fixing post 33.

[0072] The speed increasing box in this scheme adopts the aforementioned speed increasing mechanism, which makes the speed increasing box compact, stable in power output and long in service life. At the same time, the output shaft and input shaft of this speed increasing box are on the same axis, which is convenient for the use and installation of the speed increasing box.

[0073] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A speed increasing mechanism, characterized in that: It includes an input shaft, an output shaft, a double gear, a power input gear fixedly installed on the input shaft, and a power output gear fixedly installed on the output shaft; the input shaft and the output shaft are coaxially arranged; The double gear includes a first gear and a second gear, and the first gear and the second gear are coaxially and fixedly connected; The first gear and the second gear are respectively meshed with the power input gear and the power output gear, and the transmission ratio between the power input gear and the first gear is less than 1, and the transmission ratio between the second gear and the power output gear is less than 1; And the transmission ratio between the power input gear and the first gear is equal to the transmission ratio between the second gear and the power output gear.

2. The speed increasing mechanism according to claim 1, wherein: The module and the number of teeth of the power input gear and the second gear are respectively equal, and the module and the number of teeth of the first gear and the power output gear are respectively equal.

3. The speed increasing mechanism according to claim 1, characterized in that: A first bearing is arranged between the input shaft and the output shaft; the input shaft is coaxially connected with the bearing outer ring of the first bearing, and the output shaft is coaxially connected with the bearing inner ring of the first bearing; or, the output shaft is coaxially connected with the bearing outer ring of the first bearing, and the input shaft is coaxially connected with the bearing inner ring of the first bearing.

4. The speed increasing mechanism according to claim 3, characterized in that: An installation hole is coaxially arranged on the power input gear, the first bearing is coaxially sleeved in the installation hole, and the fixed outer ring of the first bearing is fixedly connected with the inner wall of the installation hole, and the output shaft is fixedly connected with the inner ring of the first bearing.

5. The speed increasing mechanism according to claim 3 or 4, characterized in that: Second bearings and third bearings are respectively sleeved on the ends of the input shaft and the output shaft away from the first bearing.

6. The speed increasing mechanism according to claim 1, characterized in that: Both the power input gear and the power output gear are helical gears, and the helix directions are opposite, and both the first gear and the second gear are helical gears, and the helix directions are opposite.

7. The speed increasing mechanism according to claim 6, characterized in that: When the first gear meshes with the power input gear, it is subjected to an axial force towards the second gear, and when the second gear meshes with the power output gear, it is subjected to an axial force towards the first gear.

8. The speed increasing mechanism according to claim 1, characterized in that: It further includes a fixed column, and the first gear and the second gear are coaxially sleeved on the fixed column and rotate relative to the fixed column.

9. The speed increasing mechanism according to claim 1 or 2 or 3, characterized in that: At least two groups of the double gears are provided, and each double gear is evenly distributed around the power input gear.

10. A speed increasing gearbox, characterized in that: It includes the speed increasing mechanism according to any one of claims 1 to 9 and a box body for installing the speed increasing mechanism, and the input shaft and the output shaft respectively extend out of the box body; Both the second bearing and the third bearing are installed on the box body; The fixed column is fixedly installed with the box body.

Images