Speed reducer

Abstract

The utility model provides a speed reducer, and relates to the technical field of speed reducers. Comprising a motor, a first reduction gearbox and a second reduction gearbox, the second gearbox is provided with a speed reduction output shaft; a plurality of groups of planetary reduction assemblies are arranged in the first reduction gearbox; the planetary reduction assembly comprises a gear disc; a sun gear is concentrically arranged in the middle of one side of the gear disc, a planet gear is arranged on the other side of the gear disc, and projections of the sun gear and the planet gear can be meshed; a gear ring is arranged on the inner wall of the first reduction gearbox, and the planet wheel protrudes out of the outer edge of the gear disc and is meshed with the gear ring; one side of the planet wheel faces the motor, and a sun wheel is arranged on an output shaft of the motor. The planetary reduction assembly is adopted to replace a traditional gear transmission structure, the problems that a traditional speed reducer is complex in structure, difficult to maintain, large in transmission noise and the like are solved, the structure is simplified, cost is reduced, noise generated in the operation process can be reduced, and the good market prospect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reducers, in particular to a speed reducer. Background Art

[0002] A reduction gear, also known as a speed reducer, is an energy transmission device. It is generally used in applications that require a large output force but do not require high speed. After the power output source is connected to the speed reducer, although the speed is slowed down, the output force will be enhanced. For example, in occasions such as heavy object handling, a strong force is required, and the speed reducer sacrifices speed, such as a high-speed motor, to make it output a stronger force, so that the conversion device can meet the application requirements.

[0003] At present, the reducer generally uses multiple ordinary gears for direct transmission. Due to the transmission composed of ordinary gears, a gear rack needs to be set inside the reducer so that the gears can be well fixed. However, this type of structure may have the following problems. First, the gear and gear rack have a complex structure and high design and manufacturing costs. Second, when the gears are worn out and need to be replaced, the gear rack needs to be disassembled, which reduces the stability of the gear rack and has low replacement efficiency. In addition, there may be a problem of high transmission noise. Therefore, the utility model proposes a reducer to at least partially solve the problems that may exist in the prior art. Utility Model Content

[0004] In order to overcome the above problems or at least partially solve the above problems, an embodiment of the utility model provides a reducer.

[0005] The embodiment of the utility model is achieved as follows:

[0006] The embodiment of the present application provides a reducer, comprising:

[0007] A motor, a first reduction gearbox and a second reduction gearbox connected in sequence;

[0008] The second reduction gearbox is provided with a reduction output shaft;

[0009] The first reduction box is provided with a plurality of sets of planetary reduction assemblies;

[0010] The planetary reduction assembly comprises a gear plate; the gear plate has a sun gear concentrically disposed in the middle of one side thereof and a planetary gear disposed on the other side thereof, and the projections of the sun gear and the planetary gear can mesh; a gear ring is disposed on the inner wall of the first reduction box, and the planetary gear protrudes from the outer edge of the gear plate and meshes with the gear ring;

[0011] One side of the planetary gear faces the motor, and a sun gear is arranged on the output shaft of the motor.

[0012] In some embodiments of the present utility model, the second reduction box has a first gear at its input end, and the first gear is connected to the sun gear at the output end of the first reduction box;

[0013] The second gear has a reduction output shaft passing through its middle, the reduction output shaft extends out of the housing of the second reduction box, and the first gear is meshed with the second gear.

[0014] In some embodiments of the present invention, the direction of the reduction output shaft forms an axial angle of 90° with the axial direction of the first gear.

[0015] In some embodiments of the utility model, a detachable cover plate is provided on one side of the housing, and a solid lubricant is provided in the first reduction box.

[0016] In some embodiments of the present invention, the sun gear, the planetary gears and the ring gear are all made of plastic.

[0017] In some embodiments of the present invention, the teeth on the sun gear, the planetary gears and the ring gear are all helical teeth.

[0018] In some embodiments of the present invention, the teeth on the sun gear, the planetary gears and the ring gear are all helical teeth.

[0019] In some embodiments of the present invention, three planetary gears are arranged on the gear plate in an equilateral triangular distribution, or four planetary gears are arranged in a square distribution.

[0020] In some embodiments of the present invention, through holes are evenly spaced between the planetary gears on the gear plate.

[0021] In some embodiments of the present invention, 4 to 8 sets of planetary reduction assemblies are provided in the first reduction box.

[0022] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0023] Through the motor, the first reduction box and the second reduction box connected in sequence; the second reduction box is provided with a reduction output shaft; the first reduction box is provided with multiple sets of planetary reduction assemblies; the planetary reduction assembly includes a gear plate; the gear plate has a sun gear concentrically provided in the middle of one side, and a planetary gear is provided on the other side, and the projections of the sun gear and the planetary gear can mesh; a gear ring is provided on the inner wall of the first reduction box, and the planetary gear protrudes from the outer edge of the gear plate and meshes with the gear ring; one side of the planetary gear faces the motor, and a sun gear is provided on the output shaft of the motor. By using a planetary reduction assembly to replace the traditional gear transmission structure, the problems of the traditional reducer with complex structure, difficult maintenance and high transmission noise are solved, which not only simplifies the structure and reduces the cost, but also reduces the noise generated during operation, and has a good market prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the structure of a reducer provided in one embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of a first reduction box of a reducer provided in one embodiment of the utility model;

[0027] Figure 3 This is a schematic diagram of the back structure of a gear plate of a reducer provided in one embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of the back structure of a gear plate of a reducer provided in one embodiment of the utility model;

[0029] Figure 5 This is a schematic structural diagram of a reducer provided in one embodiment of the utility model, in which four planetary gears are arranged inside a first reduction box.

[0030] In the figure: 1, motor; 2, first reduction gear box; 3, second reduction gear box; 201, inner wall; 202, ring gear; 203, gear plate; 204, sun gear; 205, planetary gear; 206, through hole; 301, reduction output shaft; 302, housing; 303, first gear; 304, second gear; 305, cover plate. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Example 1

[0033] In conjunction with the accompanying drawings, some implementation methods of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] Please refer to Figures 1 to 4 As shown, the embodiment of the utility model provides a reducer, which includes: a motor 1, a first reduction box 2 and a second reduction box 3 connected in sequence; the second reduction box 3 is provided with a reduction output shaft 301; the first reduction box 2 is provided with a plurality of planetary reduction assemblies, and the number of reduction stages can be set according to actual needs, wherein the greater the number of reduction stages, the greater the output force intensity; the planetary reduction assembly includes a gear plate 203; the gear plate 203 has a sun gear 204 concentrically provided in the middle of one side thereof, and a planetary gear 205 is provided on the other side thereof, and the projections of the sun gear 204 and the planetary gear 205 can mesh, that is, the sun gear 204 on one side of the above-mentioned gear plate 203 can The sun gear 204 of the upper gear disc 203 in the first reduction gear box 2 is meshed with the planetary gear 205 on the lower gear disc 203, and so on, until the sun gear 204 of the last gear disc 203 is connected to the output shaft of the first reduction gear box 2, and the output shaft is connected to the input end of the second reduction gear box 3; a gear ring 202 is provided on the inner wall 201 of the first reduction gear box 2, and the planetary gear 205 protrudes from the outer edge of the gear disc 203 and meshes with the gear ring 202; one side of the planetary gear 205 faces the motor 1, and a sun gear 204 is provided on the output shaft of the motor 1.

[0035] In this embodiment, a planetary reduction assembly is adopted to solve the problems existing in the structure of ordinary gears in the traditional reducer. Specifically, a gear rack is required to fix the gears in the traditional reducer, while through the planetary reduction assembly of the present application, the gear plate is directly used for transmission, avoiding the additional gear rack structure, thereby simplifying the structure of the reducer and reducing the design and manufacturing costs. Secondly, in the traditional reducer, the gear rack needs to be disassembled to replace the gears with large wear. In the present application, since the planetary reduction assembly can be replaced relatively independently, and multiple groups of planetary reduction assemblies can be exactly the same, there is no need to involve an additional gear rack, so maintenance is more convenient and the maintenance efficiency is improved. In addition, due to the design of the planetary reduction assembly, the meshing points in the transmission process are more evenly distributed, which reduces the meshing impact and vibration compared to the traditional gear transmission, thereby reducing the transmission noise and improving the working stability of the reducer.

[0036] It should be noted that the motor 1 as a power output source can be a DC motor, an AC motor or a variable frequency motor, and only needs to be connected to a corresponding drive circuit.

[0037] Example 2

[0038] The utility model embodiment provides a reducer, wherein, referring to Figure 1 As shown, the second reduction box 3 has a first gear 303 at its input end, and the first gear 303 is connected to the sun gear 204 at the output end of the first reduction box 2; the second gear 304 has a reduction output shaft 301 passing through its middle, and the reduction output shaft 301 extends out of the housing 302 of the first reduction box 2, and the first gear 303 and the second gear 304 are meshed with each other.

[0039] In this embodiment, the first gear 303 and the second gear 304 are provided, and the diameter of the second gear 304 is larger than that of the first gear 303, and the teeth on the first gear 303 and the second gear 304 are helical teeth, so that when the two are meshed, they have a larger contact surface; the larger contact surface makes the load distribution between the teeth of the gears more uniform, and the uniform load distribution can reduce the stress concentration on the surface of the gear, thereby reducing the generation of noise. On the other hand, the larger contact surface can reduce the impact and vibration during the meshing process, which can promote smoother movement between the gears. The smooth movement can reduce friction and vibration, thereby further reducing the generation of noise.

[0040] As a preferred embodiment, the direction of the reduction output shaft 301 is at an axial angle of 90° with the first gear 303, that is, the reduction output shaft 301 is perpendicular to the axis of the first gear 303, and can also reverse during the deceleration process. Moreover, both ends of the reduction output shaft 301 can protrude from the second reduction box 3, so that it has two synchronous output ends.

[0041] As a preferred embodiment, a removable cover plate 305 is provided on one side of the housing 302, and a solid lubricant is provided in the first reduction box 2, for example, molybdenum disulfide solid lubricant can be filled therein, which can reduce wear during operation and improve transmission efficiency.

[0042] As a preferred embodiment, the sun gear 204, the planetary gear 205 and the ring gear 202 are all made of plastic. For example, the above-mentioned gears can be made of PEK engineering plastic to have better strength. In addition, the teeth on the sun gear 204, the planetary gear 205 and the ring gear 202 are all helical teeth; the gears are made of plastic material and their teeth are set as helical teeth, which further reduces the operating noise. Moreover, compared with gears made of metal materials, gears made of plastic material can further reduce costs.

[0043] Example 3

[0044] The utility model embodiment provides a reducer, wherein, referring to Figure 2 and Figure 5 As shown, the planetary wheels 205 on the gear plate 203 are arranged in three equal triangles or four equal squares. The evenly distributed planetary wheels 205 make the meshing points more evenly distributed, so that it can reduce noise. In addition, more planetary wheels 205 can be distributed.

[0045] In this embodiment, the reducer adopts planetary gear transmission, which has the transmission characteristics of planetary motion and power splitting, and can make full use of the large bearing capacity of the internal gear and the entire accommodating space of the internal gear ring, so that the reducer has the advantages of compact structure, small outer dimensions, light weight, etc. Under normal circumstances, when the transmission power and transmission ratio are the same, the volume and weight of the planetary gear reduction motor are about 1 / 2-1 / 6 of the ordinary gear transmission, and the planetary transmission generally has the characteristics of a large transmission ratio, and its maximum transmission ratio can reach tens of thousands or hundreds of thousands. As a power transmission, its maximum transmission ratio can reach dozens or hundreds; appropriately select The type of planetary gear reduction motor can realize various complex movements with variable speeds. It uses several planetary wheels evenly distributed between the inner and outer center wheels, which can balance the inertial force acting on the center wheel and the planet carrier bearing. The use of this symmetrical structure is beneficial to improving the efficiency of the transmission system. Specifically, the efficiency of the planetary gear reduction motor can reach 97%-99%. At the same time, using multiple planetary wheels 205 can maintain uniform load distribution and uniform power distribution between the planetary wheels 205, which can not only balance the inertial force of each planetary wheel 205 and the swing arm, but also significantly improve the stability and impact and vibration resistance of the planetary gear reduction motor.

[0046] As a preferred embodiment, through holes 206 are equidistantly arranged between the planetary gears 205 on the gear plate 203. The multiple through holes 206 keep the spaces where the various groups of planetary gears 205 and the sun gear 204 in the first reduction box 2 are located connected, and the lubricating oil therein can penetrate the planetary gears 205 and the sun gear 204 at other positions through the above-mentioned through holes 206, thereby keeping the planetary gears 205 and the sun gear 204 therein well lubricated.

[0047] As a preferred embodiment, 4 to 8 sets of planetary reduction assemblies are provided in the first reduction box 2, and the above-mentioned first reduction box can also be provided with 2 or more, which can be set according to actual needs. For example, 6 sets of planetary reduction assemblies can be provided in the first reduction box 2. In addition, the motor can also use a higher-precision servo motor so that it can have a larger output.

[0048] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. Although optional embodiments of the utility model embodiments have been described, once those skilled in the art know the basic creative concept, they can make additional changes and modifications to these embodiments. Therefore, the attached claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0049] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0050] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. At the same time, for those skilled in the art, according to the principle and implementation method of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A reducer, characterized in that: include: A motor (1), a first reduction gearbox (2) and a second reduction gearbox (3) connected in sequence; The second reduction gearbox (3) is provided with a reduction output shaft (301); The first reduction box (2) is provided with a plurality of sets of planetary reduction assemblies; The planetary reduction assembly comprises a gear plate (203); a sun gear (204) is concentrically arranged in the middle of one side of the gear plate (203), and a planet gear (205) is arranged on the other side, and the projections of the sun gear (204) and the planet gear (205) can mesh; a gear ring (202) is arranged on the inner wall (201) of the first reduction box (2), and the planet gear (205) protrudes from the outer edge of the gear plate (203) and meshes with the gear ring (202); One side of the planetary gear (205) faces the motor (1), and a sun gear (204) is provided on the output shaft of the motor.

2. The reducer according to claim 1, characterized in that: The second reduction box (3) has a first gear (303) at its input end, and the first gear (303) is connected to the sun gear (204) at the output end of the first reduction box (2); The second gear (304) has a reduction output shaft (301) passing through it, the reduction output shaft (301) extends out of the housing (302) of the second reduction box (3), and the first gear (303) and the second gear (304) are meshed with each other.

3. The reducer according to claim 2, characterized in that: The direction of the speed reduction output shaft (301) and the axial angle of the first gear (303) are 90°.

4. The reducer according to claim 3, characterized in that: A detachable cover plate (305) is provided on one side of the housing (302), and a solid lubricant is provided in the first reduction box (2).

5. The reducer according to any one of claims 1 to 4, characterized in that: The sun gear (204), the planetary gears (205) and the ring gear (202) are all made of plastic.

6. The reducer according to any one of claims 1 to 4, characterized in that: The teeth on the sun gear (204), the planetary gears (205) and the ring gear (202) are all helical teeth.

7. The reducer according to claim 5, characterized in that: The teeth on the sun gear (204), the planetary gears (205) and the ring gear (202) are all helical teeth.

8. The reducer according to claim 1, characterized in that: The planetary gears (205) on the gear plate (203) are arranged in three equal triangles or in four equal squares.

9. The reducer according to claim 8, characterized in that: Through holes (206) are also arranged at equal intervals between the planetary wheels (205) on the gear plate (203).

10. The reducer according to claim 1, characterized in that: The first reduction box (2) is provided with 4 to 8 sets of planetary reduction assemblies.

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