Gear assembly, power module and curtain

Abstract

The utility model relates to the field of transmission structures, in particular to a gear assembly, a power module and a curtain, the gear assembly comprises an inner ring, an outer ring and a connecting part, and the connecting part is connected between the inner ring and the outer ring; gear teeth are arranged on the peripheral surface, far away from the connecting part, of the outer ring; a weight reduction structure is formed on the connecting part. The weight reduction structure enables the size of the connecting part to be reduced, compared with the size-reduced connecting part, the contact area of noise in the gear and a transmission path is reduced, and the purpose of noise reduction is achieved. Meanwhile, due to the fact that the weight reduction structure is formed on the connecting part between the inner ring and the outer ring, the weight reduction structure is not an additional hardware structure, and noise reduction can be achieved under the condition that original space occupation of the gear is kept.

Description

Technical Field

[0001] The present application relates to the field of transmission structures, and in particular to a gear assembly, a power module and a curtain. Background Art

[0002] Most of the equipment in the field of speed change and transmission is equipped with a gear set, which adjusts the speed of the rotating shaft through the meshing of several gears. Among them, equipment such as reduction gears often produce loud noises because they use a large number of gears in the inner ring, the gear types are different, and the gears need to rotate at high speed. Summary of the invention

[0003] The present application provides a gear assembly, a power module and a curtain to at least solve the technical problem of gear noise.

[0004] According to a first aspect of an embodiment of the present application, there is provided a gear structure, comprising an inner ring, an outer ring and a connecting portion, wherein the connecting portion is connected between the inner ring and the outer ring; the outer ring is provided with gear teeth on an outer peripheral surface away from the connecting portion;

[0005] The connecting portion is formed with a weight-reducing structure.

[0006] According to a second aspect of an embodiment of the present application, a gear assembly is provided, comprising at least one gear structure as described in the first aspect above.

[0007] According to a third aspect of an embodiment of the present application, a power module is provided, comprising the gear assembly described above, the power module further comprising a driving mechanism, the output shaft of the driving mechanism being inserted into the shaft hole of the primary sun gear of the gear assembly.

[0008] According to a fourth aspect of the embodiments of the present application, a curtain is provided, comprising the power module described above, wherein the curtain is an electric curtain or an electric roller curtain.

[0009] In the embodiment of the present application, the gear includes three parts: inner, middle and outer. A weight-reducing structure is provided on the connection between the inner ring and the outer ring. The weight-reducing structure reduces the volume of the connection. Compared with the connection after the volume reduction, the contact area of ​​the transmission path of the noise in the gear is reduced, thereby achieving the purpose of noise reduction. At the same time, since the weight-reducing structure is formed on the connection between the inner ring and the outer ring, the weight-reducing structure is not an additional hardware structure, so that the gear can achieve noise reduction while maintaining the original space occupancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram of a gear structure in an embodiment.

[0011] Figure 2The figure is a schematic diagram of a gear structure in one embodiment.

[0012] Figure 3 It is another structural schematic diagram of the gear structure in one embodiment.

[0013] Figure 4 is a cross-sectional view of a gear assembly in one embodiment.

[0014] Figure 5 It is a schematic diagram of the overall structure of a gear assembly in one embodiment.

[0015] Figure 6 It is a schematic diagram of the internal structure of a gear assembly in one embodiment.

[0016] Figure 7 It is a schematic diagram of the related structure of a first-stage planetary gear in a gear assembly in an embodiment.

[0017] Figure 8 It is a schematic diagram of the relevant structure of a first-stage planetary carrier in a gear assembly in an embodiment.

[0018] Fig. 9 FIG. 1 is a front view of a power module in one embodiment.

[0019] Fig.10 It is a schematic diagram of the overall structure of a power module in an embodiment.

[0020] Marking instructions: 1. Inner ring; 2. Outer ring; 3. Connection part; 4. Gear teeth; 5. Weight reduction structure; 51. Groove structure; 52. Hole structure; 61. Primary planetary gear; 62. Secondary planetary gear; 63. Primary sun gear; 64. Primary planet carrier; 65. Secondary sun gear; 66. Secondary planet carrier; 67. Ring gear; 7. Driving mechanism; 8. Gear assembly; 9. Connecting flange. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0023] Gears are common structures in life and are used in many devices. For example, clocks and gearboxes are equipped with multiple gears. After multiple gears are meshed, the speed change is achieved. In the process of gear rotation, noise is inevitable, especially for high-speed rotating gears, the noise is more serious and even affects the normal life of users. For example, in smart home devices, smart curtains, users control the movement of curtain fabrics by controlling the motor in the smart curtains. The motor needs to be connected to the gear structure to make the control of the moving distance of the curtain fabric more accurate and meet the needs of users.

[0024] However, curtains are usually located indoors, and the noise generated during the rotation of the gears is more prominent. If the decibel of the noise is too high, it will reduce the user experience of the smart curtains.

[0025] Based on this, the present application provides a gear structure. For ease of understanding, the gear structure is described by taking the application in smart home devices as an example. Figure 1 As shown, the gear structure includes an inner ring 1, an outer ring 2 and a connecting portion 3, wherein the connecting portion 3 is connected between the inner ring 1 and the outer ring 2; the outer peripheral surface of the outer ring 2 away from the connecting portion 3 is provided with gear teeth 4;

[0026] The connecting portion 3 is formed with a weight-reducing structure 5 .

[0027] Among them, the gear structure in this embodiment can be used as a part of a smart home device, that is, the smart home device itself contains a gear structure, and the gear structure in this embodiment can also be a gear in a driving device for driving the smart home device. For example, when the smart home device is a smart clock, the clock itself has gears, so the gear structure in this embodiment can be used in the clock. For another example, when the smart home device is a smart curtain, the motor that needs to drive the curtain of the smart curtain is connected to a reduction box, and the gear structure in this embodiment can be used as a gear in the reduction box. This embodiment does not make specific limitations on this.

[0028] In addition, it should be noted that the inner ring 1, outer ring 2 and connecting portion 3 mentioned in this embodiment are only for the purpose of explaining the position of the weight-reducing structure 5, and are not used to limit the number of parts of the gear structure itself. In other words, when manufacturing the gear structure, the inner ring 1, outer ring 2 and connecting portion 3 can be manufactured separately, and then the three can be spliced ​​together to form a gear structure; the inner ring 1, outer ring 2 and connecting portion 3 can also be manufactured together, for example, using a mold to form the inner ring 1, outer ring 2 and connecting portion 3 as one piece. Specifically, Figure 1 In the gear structure shown, when the inner ring 1, the outer ring 2 and the connecting portion 3 are integrally formed, they can be divided into the inner ring 1, the connecting portion 3 and the outer ring 2 according to the radial direction of the gear structure. As for the proportion between the three, this embodiment does not make any specific limitation.

[0029] Gear teeth 4 are arranged on the outer peripheral surface of the connecting portion 3. The number and volume of the gear teeth 4 are not specifically limited in this embodiment and can be designed according to the specific purpose of the gear structure and / or the gear teeth 4 of other gears that need to mesh with the gear structure.

[0030] The connection part 3 is located between the inner ring 1 and the outer ring 2, and the weight reduction structure 5 refers to a structure that reduces the weight of the connection part 3. Specifically, noise is composed of three essential elements: a sound source, a transmission path, and a receiver. Optimizing the transmission path of noise is a noise reduction method. And lower surface density and lower contact area can hinder the effective transmission of noise. When the material of the gear structure remains unchanged, the purpose of noise reduction can be achieved by reducing the contact area on the noise transmission path. According to this noise reduction method, a weight reduction structure 5 is formed on the connection part 3, aiming to reduce the contact area on the noise transmission path through the weight reduction structure 5, thereby achieving noise reduction. Therefore, whether the weight reduction structure 5 is understood as a structure that reduces the weight of the connection part 3, or the weight reduction structure 5 is understood as a structure that reduces the volume of the connection part 3, as long as the contact area on the noise transmission path can be reduced. For example, a hollow structure is formed on the connection part 3, so that the connection part 3 lacks a part of the solid area. The hollow structure or the missing solid area reduces the contact area on the transmission path when the noise is transmitted in the gear structure, so the hollow structure or the missing solid area is the weight reduction structure 5. At this point, it can be understood that the embodiment of the present application does not limit the shape, size, volume and specific structural form of the weight-reducing structure 5, as long as it is formed on the connecting portion 3 and has the function of reducing the weight of the connecting portion 3.

[0031] According to the above content, the gear includes three parts: inner, middle and outer. A weight reduction structure 5 is provided on the connection part 3 between the inner ring 1 and the outer ring 2. The weight reduction structure 5 reduces the volume of the connection part 3. Compared with the connection part 3 after the volume reduction, the contact area of ​​the transmission path of the noise in the gear is reduced, thereby achieving the purpose of noise reduction. At the same time, since the weight reduction structure 5 is formed on the connection part 3 between the inner ring 1 and the outer ring 2, the weight reduction structure 5 is not an additional hardware structure, so that the gear can achieve noise reduction while maintaining the original space occupancy.

[0032] In another embodiment of the present application, the weight reduction structure 5 includes at least one groove structure 51 and / or at least one hole structure 52 formed in the connecting portion 3 .

[0033] Among them, the difference between the groove structure 51 and the hole structure 52 may be understood differently in different fields. For example, the groove structure 51 is generally understood to be a non-through-type space structure, while the hole structure 52 is a through-type space structure; for another example, the groove structure 51 is generally understood to be an irregular space structure, while the hole structure 52 is a circular space structure; it can also be understood that the usual groove structure 51 refers to a space structure with a larger radius, while the hole structure 52 is a space structure with a relatively smaller radius. Based on this, since the gear structure can be applied in multiple fields, in order to facilitate understanding, the groove structure 51 of this embodiment refers to a non-through-type space structure, and its shape, size, etc. are not specifically limited. Correspondingly, the hole structure 52 refers to a through-type space structure, and its shape, size, etc. are not specifically limited. It should be noted that in other embodiments, the difference between the groove structure 51 and the hole structure 52 may also be in terms of shape or radius size.

[0034] The weight reduction structure 5 may include only at least one groove structure 51, or only at least one hole structure 52, or both at least one groove structure 51 and at least one hole structure 52. It may be specifically designed according to the use requirements of the gear structure, and this embodiment does not specifically limit this. For ease of understanding, for example, when the gear structure needs to be used in a reduction box, and the reduction box is connected to the driver in the smart curtain, in order to ensure the low noise effect of the gear structure, the volume of the weight reduction structure 5 can be increased as much as possible, so the weight reduction structure 5 may include a plurality of hole structures 52 evenly opened on the connecting portion 3, thereby minimizing the contact area on the noise transmission path. When the gear structure needs to be used in a reduction box, but the reduction box is connected to the driver in the smart refrigerator, since the smart refrigerator is usually placed in the living room or kitchen, rather than the bedroom, the noise of the gear structure can be appropriately adjusted to improve the strength of the gear structure, and then the weight reduction structure 5 is designed to include at least one groove structure 51 to improve the service life of the smart refrigerator.

[0035] According to the above content, the weight-reducing structure 5 includes a groove structure 51 and / or a hole structure 52. Since the groove structure 51 and the hole structure 52 are easy to open, that is, when the weight-reducing structure 5 is a groove structure 51 or a hole structure 52, the manufacturing difficulty of the gear structure is lower, which is conducive to reducing the cost of the gear structure. In addition, the weight-reducing structure 5 that plays a role in noise reduction will not increase the volume and size of the gear structure, which helps to further save costs.

[0036] In another embodiment of the present application, the hole structure 52 includes a plurality of holes, and the hole structure 52 includes a through hole, and the through hole penetrates the connecting portion 3 along the axis direction of the gear structure;

[0037] The connecting portion 3 between adjacent through holes is connected to the inner ring 1 and the outer ring 2 .

[0038] Specifically, in one embodiment, Figure 2 As shown, the hole structure 52 includes through holes. Specifically, the number of through holes can be the same as or less than the number of hole structures 52. That is, all hole structures 52 include at least one through hole. In addition to the through holes, the hole structure 52 can also include non-through holes. Among them, the through hole refers to a hole that passes through the connecting part 3 along the axis direction of the gear structure, and correspondingly, the non-through hole refers to a hole that does not pass through the connecting part 3 along the axis direction of the gear structure.

[0039] Since the through hole is a virtual body, that is, after the through hole is formed on the connecting part 3, it is equivalent to cutting off a part of the material of the connecting part 3 at the position of the through hole, so that a plurality of hollow areas are formed on the connecting part 3. Therefore, the material at the remaining position of the connecting part 3 is connected to the inner ring 1 and the outer ring 2, so that the inner ring 1, the connecting part 3, the outer ring 2 and the gear 4 are still a whole.

[0040] According to the above content, the hole structure 52 includes through holes, which is convenient for fully reducing the material of the connecting part 3, so that the transmission path of noise is reduced as much as possible, thereby improving the noise reduction effect.

[0041] In another embodiment of the present application, the first end side of the connecting portion 3 is provided with a groove structure 51 or both the first end side and the second end side of the connecting portion 3 are provided with a groove structure 51;

[0042] The depth of the groove structure 51 along the axial direction of the gear is lower than the thickness of the connecting portion 3 along the axial direction of the gear.

[0043] In one embodiment, if Figure 3 As shown, the connection portion 3 includes two end surfaces, and the two end surfaces are located at different sides of the connection portion 3. For the convenience of description, the location where one end surface of the connection portion 3 is located is called the first end side of the connection portion 3, and the location where the other end surface is located is called the second end side of the connection portion 3. Figure 3For example, the side facing outside the figure is the first end side, and the side facing inside the figure (the end face of this side is blocked) is the second end side.

[0044] A groove structure 51 is provided at the first end side of the connecting portion 3. Since the groove structure 51 in this embodiment refers to a non-through spatial structure, the depth of the groove structure 51 is less than the thickness in the axial direction of the gear. The axial direction of the gear structure refers to the direction perpendicular to the radial direction of the gear structure, specifically perpendicular to the radial direction of the gear structure. Figure 3 The length direction of the gear teeth 4 is parallel.

[0045] In addition, a groove structure 51 may be provided on both the first end side and the second end side of the connecting portion 3. The groove structure 51 may be semi-circular or in other shapes, and the positions of the groove structures 51 on the first end side and the second end side may be symmetrical or asymmetrical with respect to the cross-section of the gear structure, which is not specifically limited in this embodiment. For example, when only the first end side has a groove structure 51, the groove structure 51 may be provided at any position on the first end side of the connecting portion 3 and may be in any shape. When both the first end side and the second end side have groove structures 51, the groove structure 51 on the first end side is semi-circular and located Figure 3 The groove structure 51 on the second end side of the upper half of the middle connecting portion 3 is semicircular and located Figure 3 The lower half of the middle connecting part 3.

[0046] According to the above content, the weight reduction structure 5 includes the groove structure 51 and the groove structure 51 is located on the first end side and / or the second end side of the connecting part 3, so as to reduce the noise of the gear structure while ensuring the strength of the gear structure.

[0047] In another embodiment of the present application, the groove structure 51 includes an annular groove.

[0048] like Figure 3 As shown, the groove structure 51 is an annular groove. It should be noted that, Figure 3 In the embodiment, only one annular groove is provided, and in other embodiments, multiple annular grooves may be provided along the radial direction of the gear structure. That is, each annular groove has a different radius and gradually approaches the outer ring 2.

[0049] Through the above content, the annular groove is easy to open, which helps to reduce the manufacturing complexity of the gear structure and save costs.

[0050] In another embodiment of the present application, the gear structure is a planetary gear, and the inner ring 1 is provided with a shaft hole for inserting a transmission shaft.

[0051] Specifically, the shaft hole can be used to insert the transmission shaft of other gear structures, so that the gear structure can be driven by other gear structures, and then the driving force is output through the meshing between the gear teeth 4. It should be noted that the opening position of the shaft hole can be regarded as the inner ring 1, and the material on the outer peripheral side of the shaft hole can also be regarded as the inner ring 1, which is not limited in this embodiment. In addition, the gear structure can also be an ordinary gear or a sun gear.

[0052] According to the above content, the planetary gear needs to mesh with multiple gears, which is more likely to generate noise when in use. The weight reduction structure 5 is arranged on the planetary gear, which is easy to reduce more noise and improve the noise reduction effect.

[0053] In another embodiment of the present application, the inner ring 1, the outer ring 2 and the connecting portion 3 are integrally formed.

[0054] Specifically, the one-piece molding may use a mold or other production tools, which is not specifically limited in this embodiment.

[0055] In addition, the gear teeth 4 may also be formed integrally with the inner ring 1 , the outer ring 2 and the connecting portion 3 .

[0056] Through the above content, the integrally formed inner ring 1, outer ring 2 and connecting part 3 help to improve the overall strength of the gear structure, making the gear structure less likely to be deformed or damaged, thereby increasing the life of the gear structure.

[0057] An embodiment of the present application also provides a gear assembly, comprising at least one of the above-mentioned gear structures.

[0058] Among them, the gear assembly 8 can be a gear assembly 8 in a reduction box, or a gear assembly 8 in smart home devices such as curtain motors, and this embodiment does not make any specific limitations on this.

[0059] According to the above content, the gear assembly 8 includes the above gear structure, which helps to reduce the noise generated by the gear assembly 8 and save the cost of the gear assembly 8.

[0060] Specifically, Figure 4-7 As shown, the gear assembly 8 includes a primary planetary gear 61 and a secondary planetary gear 62; the gear assembly 8 also includes a primary sun gear 63, a primary planet carrier 64, a secondary sun gear 65 and a secondary planet carrier 66;

[0061] The shaft hole of the primary sun gear 63 is used to connect with the output shaft of the driving mechanism 7. The primary sun gear 63 rotates along with the output shaft, and the primary sun gear 63 meshes with the primary planetary gear 61.

[0062] The shaft hole of the first-stage planetary gear 61 is inserted into the connecting column of the first-stage planetary carrier 64;

[0063] The first-stage planet carrier 64 is connected to the second-stage sun gear 65 on the same central axis at one side away from the first-stage planet gear 61, and the first-stage planet carrier drives the second-stage sun gear 65 to rotate;

[0064] The secondary sun gear 65 meshes with the secondary planetary gear 62 , the secondary planetary gear 62 is connected to the secondary planetary carrier 66 , and the secondary planetary gear 62 drives the secondary planetary carrier 66 to rotate.

[0065] For ease of understanding, Figure 4 Take this as an example to illustrate: Figure 4 As shown, the right side of the primary sun gear 63 is used to set the driving mechanism 7, which refers to a mechanism that can drive the primary sun gear 63 to rotate, such as a rotating motor or a rotating cylinder, etc., which is not specifically limited in this embodiment. Therefore, the shaft hole of the primary sun gear 63 is located on the right side, for the output shaft of the driving mechanism 7 to be inserted, so that the primary sun gear 63 is connected to the driving mechanism 7 and driven by the output shaft of the driving mechanism 7. The primary sun gear 63 is meshed with at least one primary planetary gear 61. When the primary sun gear 63 rotates according to the output shaft of the driving mechanism 7, the primary planetary gear 61 is driven to rotate.

[0066] A first-stage planet carrier 64 is arranged on the left side of the first-stage planetary wheel 61. The first-stage planet carrier 64 is provided with connecting columns having the same number as the first-stage planetary wheel 61. Each connecting column corresponds to an axial hole of the first-stage planetary wheel 61. After the connecting column of the first-stage planet carrier 64 is inserted into the axial hole of the first-stage planetary wheel 61, the first-stage planet carrier 64 can be driven to rotate when the first-stage planetary wheel 61 rotates.

[0067] On the side of the primary planet carrier 64 away from the primary planet gear 61 (that is, Figure 4 A secondary sun gear 65 is provided on the left side of the primary planet carrier 64. The structure of the secondary sun gear 65 is the same as that of the primary sun gear 63, but the volume of the secondary sun gear 65 may be different from that of the primary sun gear 63, which is not specifically limited in this embodiment. The shaft hole of the secondary sun gear 65 is colinear with the central axis of the primary planet carrier 64, so that the connecting column on the left side of the primary planet carrier 64 can be inserted into the shaft hole of the secondary sun gear 65, so that the two are connected, and the primary planet carrier drives the secondary sun gear 65 to rotate.

[0068] The secondary sun gear 65 is meshed with at least one secondary planetary gear 62, and a connecting column of the secondary planetary carrier 66 is inserted into the shaft hole of the secondary planetary gear 62, so that the secondary planetary gear 62 is connected to the secondary planetary carrier 66, driving the secondary planetary carrier 66 to rotate. In one embodiment, a shaft hole is opened on the left side of the secondary planetary carrier 66 for connecting the output shaft to drive the output shaft to rotate, so that the output shaft can drive other structures to move.

[0069] The first-stage planetary gear 61 and the second-stage planetary gear 62 both use the above-mentioned gear structure.

[0070] According to the above content, the gear assembly 8 is provided with a primary planetary gear 61, a secondary planetary gear 62, a primary sun gear 63, a primary planet carrier 64, a secondary sun gear 65 and a secondary planet carrier 66, which helps to change the speed transmitted by the output shaft of the driving mechanism 7 by changing the radius or pitch of the gears, thereby increasing the application scenarios of the gear assembly 8 and improving the flexibility of the use of the gear assembly 8. At the same time, the primary planetary gear 61 and the secondary planetary gear 62 in the gear assembly 8 have the ability to reduce noise, which helps to reduce the noise of the gear assembly 8.

[0071] In another embodiment of the present application, Figure 8 As shown, the first-stage planet carrier 64 and the second-stage sun gear 65 are integrally formed.

[0072] That is to say, the primary planet carrier 64 and the secondary sun gear 65 are no longer connected by structures such as connecting columns and shaft holes, but can be cast together using a mold.

[0073] Through the above content, the integrated first-stage planet carrier 64 and second-stage sun gear 65 help to reduce the number of parts of the gear assembly 8 and save costs.

[0074] The present application also provides a power module, such as Figure 9-10 As shown, it includes the above-mentioned gear assembly 8 and also includes a driving mechanism 7, and the output shaft of the driving mechanism 7 is inserted into the shaft hole of the primary sun gear 63 of the gear assembly 8.

[0075] The driving mechanism 7 refers to a mechanism that can drive the primary sun gear 63 to rotate, such as a rotary motor or a rotary cylinder, etc., and this embodiment does not make any specific limitation to this.

[0076] After the output shaft of the driving mechanism 7 is inserted into the shaft hole of the primary sun gear 63 of the gear assembly 8, it is connected with the primary sun gear 63. When the driving mechanism 7 is started, the output shaft of the driving mechanism 7 drives the primary sun gear 63 to rotate, and transmits the rotational force to the gear assembly 8.

[0077] Specifically, a gear ring 67 is provided on the outer side of the gear assembly 8 , and a connecting flange 9 is provided between the gear assembly 8 and the driving mechanism 7 .

[0078] For example, the power module can be used in smart home devices, specifically, it can be used to drive the smart door to rotate. After the drive mechanism 7 is started, the gear assembly 8 reduces the rotation speed transmitted by the output shaft of the drive mechanism 7, so that the rotation speed and rotation angle of the smart door can be gradually adjusted.

[0079] According to the above content, the power module includes the gear assembly 8, which helps to reduce the noise of the power module and save the cost of the power module.

[0080] An embodiment of the present application also provides a curtain, comprising the above-mentioned power module, wherein the curtain is an electric curtain or an electric roller curtain.

[0081] Specifically, after the power module is connected to the curtain of the electric curtain or electric roller blind, the driving mechanism 7 drives the gear assembly 8 to rotate, and the gear assembly 8 transmits the rotational force to the curtain, so that the curtain moves, thereby realizing the opening or closing of the curtain.

[0082] Through the above content, the application of power modules in curtains helps to reduce the noise emitted by the curtains and improve the user experience.

[0083] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A gear assembly, characterized in that: It includes a primary planetary gear, a primary sun gear and a primary planet carrier, wherein the primary planetary gear and / or the primary sun gear adopts a gear structure; The gear structure comprises an inner ring, an outer ring and a connecting portion, wherein the connecting portion is connected between the inner ring and the outer ring; the outer peripheral surface of the outer ring away from the connecting portion is provided with gear teeth; The connecting portion is formed with a weight-reducing structure; The primary sun gear is used to be connected to a driving mechanism, and the primary sun gear is meshed with the primary planetary gear.

2. The gear assembly according to claim 1, characterized in that: The weight reduction structure includes at least one groove structure and / or at least one hole structure formed in the connecting portion.

3. The gear assembly according to claim 2, characterized in that: The hole structure includes a plurality of holes, and the hole structure includes a through hole, and the through hole penetrates the connecting portion along the axis direction of the gear structure; The connecting portion between adjacent through holes is connected to the inner ring and the outer ring.

4. The gear assembly according to claim 2, characterized in that: The first end side of the connecting portion is provided with the groove structure, or both the first end side and the second end side of the connecting portion are provided with the groove structure; The depth of the groove structure along the axial direction of the gear is lower than the thickness of the connecting portion along the axial direction of the gear structure.

5. The gear assembly according to claim 4, characterized in that: The groove structure includes an annular groove.

6. The gear assembly according to any one of claims 1 to 5, characterized in that: The inner ring is provided with a shaft hole for inserting the transmission shaft.

7. The gear assembly according to any one of claims 1 to 5, characterized in that: The inner ring, the outer ring and the connecting portion are integrally formed.

8. The gear assembly according to claim 1, characterized in that: The gear assembly further comprises a secondary planetary gear, a secondary sun gear and a secondary planet carrier; the secondary planetary gear and / or the secondary sun gear adopt a gear structure; The shaft hole of the primary sun gear is used to be connected to the output shaft of the driving mechanism, and the primary sun gear rotates along with the output shaft; The connecting column of the first-stage planet carrier is inserted into the shaft hole of the first-stage planet gear; The first-stage planet carrier is connected to the second-stage sun gear on the same central axis at one side away from the first-stage planet gear, and the first-stage planet carrier drives the second-stage sun gear to rotate; The secondary sun gear is meshed with the secondary planetary gear, the secondary planetary gear is connected with the secondary planetary carrier, and the secondary planetary gear drives the secondary planetary carrier to rotate.

9. The gear assembly according to claim 8, characterized in that: The first-stage planet carrier and the second-stage sun gear are integrally formed.

10. A power module, characterized in that: The gear assembly comprises the gear assembly according to any one of claims 1 to 9, wherein the power module further comprises a driving mechanism, and an output shaft of the driving mechanism is inserted into the shaft hole of the primary sun gear of the gear assembly.

11. A curtain, characterized in that: It comprises the power module as claimed in claim 10, wherein the curtain is an electric curtain or an electric roller curtain.

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