Speed reducer and power device

Abstract

The embodiment of the present application provides a kind of reducer, including input, output and rolling element, the input includes eccentric shaft, first shell, cycloid disc, the first shell has inner wall, the inner wall is enclosed first inner cavity, eccentric shaft includes power connection part and eccentric portion along its axial direction distribution, cycloid disc is set in inner cavity, and cycloid disc is set in eccentric portion.The rolling element is arranged between the inner wall and the outer surface of cycloid disc, and between eccentric portion and cycloid disc, output is connected with cycloid disc and rotates synchronously with cycloid disc.By setting rolling element between cycloid disc and first shell, and setting rolling element between eccentric portion and cycloid disc, the radial dimension of cycloid disc and first shell and eccentric shaft is greatly reduced, so that the radial dimension of the whole reducer is significantly reduced, and the applicability of reducer and power device is improved.In addition, the embodiment of the present application also provides a kind of power device.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, specifically to a speed reducer and a power device. Background Technology

[0002] Miniature speed reducers are small speed reducers characterized by their small size, light weight, compact structure, and high efficiency. They are widely used in various mechanical transmission systems. However, currently, miniature speed reducers are still relatively large, making them unsuitable for applications in electronic devices, wearable devices, and other similar applications, thus limiting their applicability. Summary of the Invention

[0003] The purpose of this application is to provide a speed reducer and a power unit to at least partially solve the above-mentioned technical problems.

[0004] In a first aspect, embodiments of this application provide a speed reducer, including an input section, an output section, and rolling elements. The input section includes an eccentric shaft, a first housing, and a cycloidal disk. The first housing has an inner wall that forms a first inner cavity. The eccentric shaft includes a power connection section and an eccentric portion distributed along its axial direction. The cycloidal disk is disposed within the inner cavity and sleeved on the eccentric portion. The rolling elements are disposed between the inner wall and the outer surface of the cycloidal disk, and between the eccentric portion and the cycloidal disk. The output section is connected to the cycloidal disk and rotates synchronously with it.

[0005] Secondly, embodiments of this application provide a power device, including a drive unit and the aforementioned reducer, wherein the drive unit is throttle-connected to the power connection unit or the output unit.

[0006] The reducer and power device provided in this application embodiment significantly reduce the radial dimensions of the cycloidal disk, the first housing, and the eccentric shaft by providing a rolling element between the cycloidal disk and the first housing, and between the eccentric portion and the cycloidal disk. This significantly reduces the radial dimension of the entire reducer and improves the applicability of the reducer and power device.

[0007] These or other aspects of this application will become more apparent in the following description of the embodiments. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1This is a shaft side view of a speed reducer proposed in an embodiment of this application.

[0010] Figure 2 This is a schematic diagram of the structure of a speed reducer proposed in an embodiment of this application from a top-down perspective.

[0011] Figure 3 This is a schematic diagram of the disassembled structure of a speed reducer proposed in an embodiment of this application.

[0012] Figure 4 This is a schematic diagram of the structure of the first housing in a speed reducer according to an embodiment of this application.

[0013] Figure 5 This is a schematic diagram of the structure of an eccentric shaft in a speed reducer according to an embodiment of this application.

[0014] Figure 6 yes Figure 2 Cross-sectional view along line AA.

[0015] Figure 7 yes Figure 2 Cross-sectional view along line BB.

[0016] Figure 8 This is a schematic diagram of the structure of a cycloidal disk in a speed reducer according to an embodiment of this application.

[0017] Figure 9 This is a schematic diagram of the input disc in a speed reducer according to an embodiment of this application.

[0018] Figure 10 This is a schematic diagram of the structure of the second housing in a speed reducer according to an embodiment of this application.

[0019] Figure 11 This is a schematic diagram of the output disc structure in a speed reducer according to an embodiment of this application.

[0020] Figure 12 This is a schematic diagram of the structure of a power device proposed in an embodiment of this application. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] Miniature speed reducers are small speed reducers characterized by their small size, light weight, compact structure, and high efficiency. They are widely used in various mechanical transmission systems. However, currently, miniature speed reducers are still relatively large, making them unsuitable for applications in electronic devices, wearable devices, and other similar applications, thus limiting their applicability.

[0023] Current speed reducers require bearings at both the power input and output ends, and due to limitations in bearing manufacturing technology, they are generally quite large. While smaller bearings are available, their torque-bearing capacity is relatively poor. Some planetary speed reducers are also small in size, but the micro-gears inside are difficult and expensive to manufacture, making them unsuitable for widespread application.

[0024] Based on this, the inventors of this application, after long-term research, have proposed a speed reducer and a power device that can reduce the thickness of the rotating shaft assembly.

[0025] The contents of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Please refer to the following: Figure 1 and Figure 2 ,like Figure 1 and Figure 2 As shown, this embodiment provides a speed reducer 10, including an input section 100, an output section 200, and a rolling element 400. Figure 3 As shown in the figure, the input unit 100 can be used to receive external power or transmit power to the outside, and the output unit 200 can also be used to receive external power or transmit power to the outside.

[0027] Specifically, please refer to Figure 3 The input unit 100 includes an eccentric shaft 130, a first housing 110, and a cycloidal disk 150. In this embodiment, as... Figure 4 As shown, the first outer shell 110 is a generally hollow columnar structure. The first outer shell 110 has an inner wall that forms a first inner cavity 111. The first inner cavity 111 has openings at both ends along the axial direction of the first outer shell 110 to allow the cycloidal disc 150 to enter the first inner cavity 111.

[0028] See Figure 5The eccentric shaft 130 includes a power connection portion 133 and an eccentric portion 134 distributed along its axis X. The power connection portion 133 is used to connect to an external power source or a driven device, which refers to a device that needs to receive external power for activation. In this embodiment, the eccentric shaft 130 includes a first end 131 and a second end 132 opposite to each other. The power connection portion 133 is located at the end of the first end 131. The power connection portion 133 can be configured in various forms, and this embodiment does not limit this. As a more specific embodiment, in this embodiment, the power connection portion 133 includes a groove disposed at the first end 131. When connected to an external power source or a driven device, the external power source or driven device can be connected by embedding it into the groove in the power connection portion 133.

[0029] The eccentric shaft 130 has an axis X, and the eccentric part 134 is used to connect with the cycloidal disk 150. It should be noted that the eccentric axis of the eccentric part 134 does not coincide with the axis X of the eccentric shaft 130, and the eccentric axis of the eccentric part 134 is parallel to the axis X of the eccentric shaft 130.

[0030] Please assemble together. Figure 6 and Figure 7 The cycloidal disk 150 is disposed within the first inner cavity 112 formed by the first outer shell 110. The cycloidal disk 150 has a generally disc-shaped structure, such as... Figure 8 As shown, the cycloidal disk 150 is provided with a shaft hole 154, which mates with the eccentric portion 134 of the eccentric shaft 130. The shaft hole 154 of the cycloidal disk 150 is fitted outside the eccentric portion 134, meaning the shaft hole 154 is also eccentrically positioned relative to the cycloidal disk 150. The outer wall contour of the cycloidal disk 150 has multiple gear teeth 157, which are evenly distributed on the outer wall of the cycloidal disk 150, making the cycloidal disk 150 resemble a gear structure for mates with the inner wall of the first outer casing 110.

[0031] Please refer to it again. Figure 4 and Figure 7The rolling element 400 is used to establish power transmission. The rolling element 400 refers to a component that achieves power transmission through rolling friction. For example, the rolling element 400 can be a ball bearing or similar material. The rolling element 400 is disposed between the inner wall and the outer surface of the cycloidal disk 150, providing rolling friction between the cycloidal disk 150 and the inner wall of the first outer shell 110. The rolling element 400 is also disposed between the eccentric portion 134 and the cycloidal disk 150, providing rolling friction between them. When the eccentric shaft 130 is driven to rotate, it drives the eccentric portion 134 to rotate. Since the eccentric portion 134 is eccentrically positioned relative to the axis X of the eccentric shaft 130, it drives the cycloidal disk 150 to rotate while oscillating. When the cycloidal disk 150 rotates relative to the first outer shell 110, the gear teeth 157 on the outer wall of the cycloidal disk 150 roll relative to the rolling element 400, thereby achieving differential rotation and deceleration. The number of teeth on the outer wall of the cycloidal disk 150 determines the reduction ratio of the reducer 10.

[0032] Because the radial dimension of the rolling element 400 is small, the radial dimension of the entire input section 100 can be significantly reduced, thereby reducing the overall volume of the reducer 10. In this embodiment, radial refers to the radial direction along the eccentric shaft 130. The rolling element 400 can be a cylindrical needle roller 410 or a spherical ball roller 420. The rolling element 400 can also be partially composed of needle rollers 410 and partially of balls 420; this embodiment does not limit this.

[0033] To further reduce the overall size of the reducer 10, in this embodiment, please refer again... Figure 4 The inner wall of the first outer shell 110 is provided with a plurality of ball grooves 113. The rolling element 400 includes a plurality of needle rollers 410, which are rolled and embedded in the plurality of ball grooves 113 in a corresponding manner. The needle rollers 410 can rotate relative to the first outer shell 110 within the ball grooves 113. At least part of the needle rollers 410 are exposed from the ball grooves 113 and engage with the gear teeth 157 on the outer wall of the cycloidal disk 150. The needle rollers 410 are embedded in the gaps between the gear teeth 157 on the outer wall of the cycloidal disk 150, so that the cycloidal disk 150 can rotate relative to the first outer shell 110. The needle rollers 410 are cylindrical rod-shaped structures, and the ball grooves 113 are straight groove-shaped structures adapted to match the structure of the needle rollers 410. The extending direction of the ball grooves 113 is arranged in the same direction as the axial direction of the eccentric shaft 130, and the gear teeth 157 on the outer wall of the corresponding cycloidal disk 150 are set as straight teeth that engage with the ball grooves 113. In some other embodiments, the extending direction of the ball groove 113 may also be inclined relative to the axial direction of the eccentric shaft 130. In this case, the gear teeth 157 on the outer wall of the corresponding cycloidal disk 150 are configured as helical teeth that cooperate with the ball groove 113.

[0034] To facilitate the assembly of the needle roller 410, the ball groove 113 can penetrate through both end faces of the first housing 110. The number of ball grooves 113 is equal to and corresponds one-to-one with the number of gear teeth 157 on the outer wall of the cycloidal disk 150. Furthermore, the number of ball grooves 113 determines the reduction ratio of the reducer 10. Therefore, the number of ball grooves 113 can be reasonably set according to the actual reduction ratio requirements. In some other embodiments, the ball groove 113 can also be set in the form of a spherical groove, in which case the needle roller 410 can be set in the form of a ball 420. This embodiment does not limit this.

[0035] In this embodiment, please refer again. Figure 8 The cycloidal disk 150 has a plurality of first ball grooves 155 evenly arranged on the inner wall of the shaft hole 154. Each first ball groove 155 can be a spherical groove. The rolling element 400 also includes a plurality of balls 420, which are spherical and structurally matched to the first ball grooves 155. Each ball 420 is embedded in one-to-one within the first ball grooves 155 and at least partially extends out of them. An eccentric portion 134 is disposed within the shaft hole 154 and abuts against the balls 420, allowing the eccentric portion 134 to roll and rotate relative to the cycloidal disk 150, thereby reducing rotational resistance and improving rotational efficiency. It is understood that in other embodiments, the first ball grooves 155 can also be disposed on the outer wall of the eccentric portion 134, achieving the same technical effect. It is understood that in some other embodiments, the first ball groove 155 may also be configured in a form similar to the needle roller groove 113, in which case a needle roller is provided between the cycloidal disk 150 and the eccentric shaft 130 as a power transmission medium for the rolling rotation between the cycloidal disk 150 and the eccentric shaft 130.

[0036] When the power connection part 133 of the eccentric shaft 130 is driven by an external force, it drives the eccentric shaft 130 to rotate. At this time, the eccentric part 134 drives the cycloidal disk 150 to rotate in the opposite direction, achieving a deceleration effect. To improve the stability of the cycloidal disk 150, please refer to the following embodiment again. Figure 5 The eccentric portion 134 includes a first eccentric portion 135 and a second eccentric portion 136 arranged side by side along the axial direction of the eccentric shaft 130. The first eccentric portion 135 and the second eccentric portion 136 are spaced apart from each other, wherein the first eccentric portion 135 is closer to the power connection portion 133, and the second eccentric portion 136 is located at the end of the first eccentric portion 135 away from the power connection portion 133. The eccentric axis X1 of the first eccentric portion 135 and the eccentric axis X2 of the second eccentric portion 136 are not collinear.

[0037] The cycloidal disk 150 includes a first cycloidal disk 151 and a second cycloidal disk 152. The first cycloidal disk 151 is sleeved on the first eccentric portion 135, and the second cycloidal disk 152 is sleeved on the second eccentric portion 136. The rolling element 400 is disposed between the first cycloidal disk 151 and the first eccentric portion 135, and between the second cycloidal disk 152 and the second eccentric portion 136. The arrangement of the rolling element 400 between the first cycloidal disk 151 and the first eccentric portion 135, and between the second cycloidal disk 152 and the second eccentric portion 136 can be referred to the content of the foregoing embodiment, and this embodiment does not limit it.

[0038] By setting up a first cycloidal disk 151 and a second cycloidal disk 152, since the eccentric axis X1 of the first eccentric part 135 and the eccentric axis X2 of the second eccentric part 136 are not collinear, the eccentric torque generated during the oscillation process can be better balanced when the first cycloidal disk 151 and the second cycloidal disk 152 rotate simultaneously. This reduces vibration and instability during the operation of the reducer 10 and improves its vibration resistance. Using two cycloidal disks 150 can also increase the structural strength and load-bearing capacity of the reducer 10. It is understood that in some other embodiments, there may be only one cycloidal disk 150, or the number of cycloidal disks 150 may be more than two; this embodiment does not limit this.

[0039] To further improve the stability of the first cycloidal disk 151 and the second cycloidal disk 152 during rotation, in this embodiment, the eccentric axis X1 of the first eccentric portion 135 and the eccentric axis X2 of the second eccentric portion 136 are located on both sides of the axis X of the eccentric shaft 130 and are symmetrically arranged with respect to the axis X of the eccentric shaft 130. This arrangement allows the eccentric torques of the first cycloidal disk 151 and the second cycloidal disk 152 to cancel each other out during rotation, thereby further improving the stability of the first cycloidal disk 151 and the second cycloidal disk 152 during rotation. In other embodiments, when there are more than two cycloidal disks 150, the number of eccentric portions 134 of the eccentric shaft 130 is matched with the number of cycloidal disks 150, and the eccentric axes of the multiple eccentric portions 134 can be arranged in a centrally symmetrical manner with respect to the axis X of the eccentric shaft 130.

[0040] During the relative rotation of the first cycloidal disk 151 and the second cycloidal disk 152, in order to avoid rotational resistance caused by mutual contact between the first cycloidal disk 151 and the second cycloidal disk 152, please refer to the following embodiment: Figure 3 , Figure 6 as well as Figure 7The cycloidal disk 150 also includes a clamping ring 153, which is a generally annular structure. The clamping ring 153 is sleeved on the outside of the eccentric shaft 130 and is positioned between the first cycloidal disk 151 and the second cycloidal disk 152, so that the first cycloidal disk 151 and the second cycloidal disk 152 are spaced apart from each other in the axial direction of the eccentric shaft 130. More specifically, the end face of the first cycloidal disk 151 near the second cycloidal disk 152 abuts against the clamping ring 153, and simultaneously, the end face of the second cycloidal disk 152 near the first cycloidal disk 151 abuts against the clamping ring 153. The thickness of the clamping ring 153 is the distance between the first cycloidal disk 151 and the second cycloidal disk 152.

[0041] The first cycloidal disk 151 and the second cycloidal disk 152 have roughly the same structure, which can be found in the reference document. Figure 8 In addition to the foregoing content, the connection relationship between the first cycloidal disk 151 and the second cycloidal disk 152 and the inner wall of the first outer shell 110 can also be referred to the content of the foregoing embodiments, and will not be repeated here.

[0042] In this embodiment, please continue to refer to Figure 8 The first cycloidal disk 151 and the second cycloidal disk 152 are also provided with one or more first connecting holes 156. The axial direction of the first connecting hole 156 is the same as the axial direction of the shaft hole 154 and passes through the first cycloidal disk 151 or the second cycloidal disk 152. The first connecting hole 156 is used for transmission connection with the output part 200. When there are multiple first connecting holes 156 provided on the first cycloidal disk 151 and the second cycloidal disk 152, the multiple first connecting holes 156 can be arranged in a centrally symmetrical manner with respect to the axial direction of the output shaft 250. As a more specific embodiment, in this embodiment, the first cycloidal disk 151 is provided with 6 first connecting holes 156, the second cycloidal disk 152 is provided with 6 first connecting holes 156, and after the eccentric shaft 130 is assembled, the 6 first connecting holes 156 provided on the first cycloidal disk 151 correspond one-to-one with the 6 first connecting holes 156 provided on the second cycloidal disk 152.

[0043] In this embodiment, please refer to the following: Figure 6 , Figure 7 and Figure 9The input section 100 also includes an input disk 300, which is connected to the end of the first housing 110 away from the output section 200 and can close the first inner cavity 111. Specifically, the input disk 300 can be connected to the end of the first housing 110 away from the output section 200 by means of adhesive, snap-fit, etc. Specifically, the input disk 300 has a generally circular plate structure, and a socket 310 is provided at approximately the center of the input disk 300. The socket 310 passes through the input disk 300 and communicates with the first inner cavity 111. When the eccentric shaft 130 is assembled on the cycloidal disk 150, the first end 131 of the eccentric shaft 130 is received in the socket 310. This arrangement facilitates the connection of external drive devices or devices to be driven into the socket 310 and to the power connection section 133.

[0044] To avoid excessive rotational resistance between the eccentric shaft 130 and the input disk 300 during rotation, in this embodiment, please refer to... Figure 9 The inner wall of the input disk 300 surrounding the insertion hole 310 is provided with a plurality of fourth ball grooves 320. The fourth ball grooves 320 are opened towards the central hole 231. The rolling element 400 includes a plurality of balls 420, which are correspondingly embedded in the plurality of fourth ball grooves 320 and at least partially protrude from the fourth ball grooves 320. When the first end 131 of the eccentric shaft 130 is assembled into the insertion hole 310, the first end 131 of the eccentric shaft 130 rotates and rolls with the plurality of balls 420 disposed in the fourth ball grooves 320, thereby reducing the rotational resistance between the eccentric shaft 130 and the input disk 300. It is understood that in some other embodiments, the fourth ball groove 320 may also be configured in a form similar to the needle roller groove 113. In this case, a needle roller is disposed between the input disk 300 and the eccentric shaft 130 as a power transmission medium for the rolling rotation between the input disk 300 and the eccentric shaft 130.

[0045] The output unit 200 is connected to the cycloidal disk 150 and rotates synchronously with the cycloidal disk 150, thereby outputting the power of the cycloidal disk 150 to the output unit 200. Therefore, the output unit 200 can be used to receive external power or transmit power to the outside.

[0046] In this embodiment, please refer again. Figure 3 The output section 200 includes an output shaft 250, an output disk 230, and a second housing 210. The output shaft 250 is used for driving connection between the cycloidal disk 150 and the output disk 230, and the second housing 210 is used to house the output disk 230.

[0047] Specifically, such as Figure 10As shown, in this embodiment, the second outer shell 210 forms a second inner cavity 215. The output disk 230 is disposed within the second inner cavity 215 and can rotate relative to the second outer shell 210. The structure of the first inner cavity 111 is approximately the same as that of the second inner cavity 215, both being approximately cylindrical cavities. Furthermore, to maintain the uniformity of the overall dimensions of the reducer 10, the outer diameter of the first outer shell 110 is the same as that of the second outer shell 210. The first outer shell 110 can be stacked with the second outer shell 210, allowing the first inner cavity 111 and the second inner cavity 215 to communicate with each other. In this embodiment, the second outer shell 210 includes a side shell 212 and a bottom shell 211. The bottom shell 211 has a through hole 213, which allows other devices to extend into the second inner cavity 215. The side shell 212 is connected to the edge of the bottom shell 211. The side shell 212 and the bottom shell 211 form a second inner cavity 215. The end of the side shell 212 away from the bottom shell 211 is open. During assembly, the end of the side shell 212 away from the bottom shell 211 is connected to the first outer shell 110, for example, by adhesive bonding.

[0048] The output disk 230 has a generally disc-shaped structure, and the output disk 230 can rotate relative to the second housing 210. Please refer again to this embodiment. Figure 6 and Figure 7 The rolling element 400 is also disposed between the output disk 230 and the inner wall forming the second inner cavity 215, so that the output disk 230 and the second outer shell 210 can roll and rotate relative to each other, reducing the rotational resistance between them. Specifically, in this embodiment, in order to further reduce the rotational resistance between the output disk 230 and the second outer shell 210, please combine with... Figure 7 and Figure 10 Both the side shell 212 and the bottom shell 211 are provided with a plurality of second ball grooves 214. The second ball grooves 214 are opened towards the second inner cavity 215. The rolling element 400 includes a plurality of balls 420. The plurality of balls 420 are embedded in the plurality of second ball grooves 214 one by one and at least partially protrude from the second ball grooves 214. The output disk 230 abuts against the plurality of balls 420, so that the output disk 230 and the second outer shell 210 rotate and roll, thereby reducing rotational resistance. Since both the side shell 212 and the bottom shell 211 are provided with second ball grooves 214, the output disk 230 and the bottom shell 211 and the side shell 212 are all rotational and rolling structures, so the rotational resistance between the second outer shell 210 and the output disk 230 can be significantly reduced.

[0049] It is understood that in some other embodiments, the second ball groove 214 may also be configured in a form similar to the needle roller groove 113. In this case, a needle roller is provided between the output disk 230 and the second housing 210 as a power transmission medium for the rolling rotation between the output disk 230 and the second housing 210.

[0050] like Figure 11As shown, the output disk 230 is provided with a center hole 231, which is located at the center of the output disk 230. The size of the center hole 231 can be adapted to the second end 132 of the eccentric shaft 130, so that the second end 132 of the eccentric shaft 130 can be accommodated in the center hole 231 during assembly.

[0051] In this embodiment, please continue to refer to Figure 11 The inner wall of the output disk 230 surrounding the central hole 231 is provided with a plurality of third ball grooves 233. The third ball grooves 233 are opened towards the central hole 231. The rolling element 400 includes a plurality of balls 420. The plurality of balls 420 are embedded in the plurality of third ball grooves 233 one by one and at least partially protrude from the third ball grooves 233. When the second end 132 of the eccentric shaft 130 is assembled in the central hole 231, the second end 132 of the eccentric shaft 130 rotates and rolls with the plurality of balls 420 provided in the third ball grooves 233, thereby reducing rotational resistance.

[0052] It is understood that in some other embodiments, the third ball groove 233 may also be configured in a form similar to the needle roller groove 113. In this case, a needle roller is provided between the output disk 230 and the second end 132 of the eccentric shaft 130 as a power transmission medium for the rolling rotation between the output disk 230 and the second end 132 of the eccentric shaft 130.

[0053] In this embodiment, please continue to refer to Figure 11 The output disk 230 is also provided with one or more second connection holes 232. The second connection holes 232 are used for transmission connection with the cycloidal disk 150. Specifically, the number of second connection holes 232 is equal to the number of first connection holes 156 provided on the first cycloidal disk 151 and the number of first connection holes 156 provided on the second cycloidal disk 152, and they are set in a one-to-one correspondence.

[0054] The output shaft 250 is fixedly connected to the output disk 230 and the cycloidal disk 150. In this embodiment, see [reference]. Figure 6The output shaft 250 is embedded in the first connecting hole 156 and the second connecting hole 232, realizing the transmission connection between the output disk 230 and the cycloidal disk 150. Specifically, after the output shaft 250 is embedded in the first connecting hole 156, it is interference-fitted with the cycloidal disk 150, and simultaneously, after the output shaft 250 is embedded in the second connecting hole 232, it is interference-fitted with the output disk 230. In this embodiment, there are 6 output shafts 250, the same number as the first connecting hole 156 and the second connecting hole 232. Each output shaft 250 connects to one first connecting hole 156 and one second connecting hole 232, so that the cycloidal disk 150 and the output disk 230 can be stably connected and maintain synchronous rotation. In some other embodiments, the number of output shafts 250 can also be other values, which are not limited in this embodiment. Furthermore, the output shaft 250 can also take other forms, such as the output disk 230 and the cycloidal disk 150 being assembled together by a snap-fit ​​to achieve synchronous rotation between them.

[0055] The output disk 230 is used to transmit or receive external power; therefore, the output disk 230 needs to be connected to an external drive device or a device to be driven. As a more specific implementation, in this embodiment, such as... Figure 7 As shown, a connecting groove 234 is provided on the side of the output disk 230 away from the cycloidal disk 150. The connecting groove 234 is used to connect an external driving device or a device to be driven. The cross-section of the connecting groove 234 can be circular, rectangular, or oblong, etc., and this embodiment does not limit it. In this embodiment, the cross-section of the connecting groove 234 is rectangular, and the position of the connecting groove 234 corresponds to the through hole 213 on the bottom shell 211, so that the external driving device or the device to be driven can pass through the through hole 213 and connect to the connecting groove 234.

[0056] The working principle of the reducer 10 provided in this embodiment is as follows: When a smaller output speed is required, the power connection part 133 can be connected to the drive device, and the output disk 230 can be connected to the device to be driven. When the eccentric shaft 130 rotates under the drive of the drive device, the eccentric part 134 of the eccentric shaft 130 drives the cycloidal disk 150 to rotate and swing to reduce speed. Since the cycloidal disk 150 is fixedly connected to the output disk 230 and rotates synchronously, the output disk 230 rotates at a smaller speed than the drive device and outputs to the device to be driven. When a higher output speed is required, the power connection part 133 can be connected to the device to be driven, and the output disk 230 can be connected to the drive device. When the output disk 230 rotates under the drive device, since the cycloidal disk 150 is fixedly connected to the output disk 230 and rotates synchronously, the cycloidal disk 150 rotates at a lower speed than the drive device. At this time, the cycloidal disk 150 drives the eccentric part 134 of the eccentric shaft 130 to rotate in the opposite direction and increase the speed. The speed of the eccentric shaft 130 is higher than the speed of the output disk 230. The eccentric shaft 130 drives the device to be driven to rotate, thereby achieving the speed increase effect.

[0057] The diameter of the reducer 10 provided in this embodiment can be reduced to 5mm, so it can be applied to devices with confined installation environments, such as electronic devices. Electronic devices can be mobile phones or smartphones (e.g., iPhone™, Android™ based phones), portable gaming devices (e.g., Nintendo DS™, PlayStation Portable™, Gameboy Advance™, iPhone™), laptops, PDAs, portable internet devices, music players and data storage devices, other handheld devices, and devices such as watches, headphones, pendants, etc. Electronic devices can also be other wearable devices (e.g., head-mounted devices (HMDs) such as electronic glasses, electronic clothing, electronic bracelets, electronic necklaces, electronic tattoos, electronic devices or smartwatches). Electronic devices may also be cellular phones, smartphones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, video recorders, cameras, other media recorders, radios, medical devices, vehicle transport instruments, calculators, programmable remote controls, pagers, laptop computers, desktop computers, printers, netbooks, personal digital assistants (PDAs), portable multimedia players (PMPs), Moving Picture Experts Group (MPEG-1 or MPEG-2) audio (MP3) players, portable medical devices, and digital cameras and combinations thereof, which are not limited in this embodiment.

[0058] See Figure 12This embodiment also provides a power device 1, including a drive unit 20 and the aforementioned reducer 10. The drive unit 20 can be a motor or other power source, which is not limited in this application. The drive unit 20 is driven to either a power connection unit 133 or an output unit 200. When the drive unit 20 is driven to the power connection unit 133, the power device 1 can output low-speed, high-torque power. When the drive unit 20 is driven to the output unit 200, for example, when driven to the output disk 230 of the output disk 230, the power device 1 can output high-speed, low-torque power.

[0059] The aforementioned power unit 1 can be applied to electronic devices, robots, wearable devices, etc., and this application does not limit the application to such applications.

[0060] It should also be noted that in this embodiment, the terms "first", "second", "third", "fourth" are used only for distinction and do not represent a limitation on the specific structure.

[0061] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A speed reducer, characterized in that, include: The input section includes an eccentric shaft, a first housing, and a cycloidal disk. The first housing has an inner wall that forms a first inner cavity. The inner wall is provided with a plurality of needle roller grooves. The eccentric shaft includes a power connection part and an eccentric part distributed along its axial direction. The cycloidal disk is disposed in the inner cavity and sleeved on the eccentric part. The cycloidal disk is provided with a shaft hole, and the inner wall of the cycloidal disk surrounding the shaft hole is provided with a plurality of first ball grooves. A rolling element is disposed between the inner wall and the outer surface of the cycloidal disk, and between the eccentric portion and the cycloidal disk. The rolling element includes a plurality of needle rollers and a plurality of balls. The plurality of needle rollers are rolled and embedded in the plurality of needle roller grooves in a corresponding manner. The plurality of balls are embedded in the plurality of first ball grooves in a corresponding manner and at least partially extend out of the first ball grooves. The eccentric portion is disposed in the shaft hole and abuts against the plurality of balls. as well as An output section is connected to the cycloidal disk and rotates synchronously with the cycloidal disk.

2. The reducer according to claim 1, characterized in that, The extension direction of the needle roller groove is the same as the axial direction of the eccentric shaft.

3. The reducer according to any one of claims 1-2, characterized in that, The eccentric portion includes a first eccentric portion and a second eccentric portion arranged side by side along the axial direction of the eccentric shaft. The cycloidal disk includes a first cycloidal disk and a second cycloidal disk. The first cycloidal disk is sleeved on the first eccentric portion, and the second cycloidal disk is sleeved on the second eccentric portion. The rolling element is disposed between the first cycloidal disk and the first eccentric portion, and between the second cycloidal disk and the second eccentric portion.

4. The reducer according to claim 3, characterized in that, The eccentric axis of the first eccentric part and the eccentric axis of the second eccentric part are located on both sides of the axis of the eccentric shaft and are symmetrical with respect to the axis of the eccentric shaft.

5. The reducer according to claim 3, characterized in that, The cycloidal disc also includes a clamping ring, which is disposed between the first cycloidal disc and the second cycloidal disc to space the first cycloidal disc and the second cycloidal disc apart from each other.

6. The reducer according to any one of claims 1-2, characterized in that, The output section includes an output shaft, an output disk, and a second housing. The second housing forms a second inner cavity. The output disk is disposed within the second inner cavity. The rolling element is also disposed between the output disk and the inner wall surrounding the second inner cavity. The output shaft is fixedly connected to the output disk and the cycloidal disk.

7. The reducer according to claim 6, characterized in that, The second outer shell includes a side shell and a bottom shell. The bottom shell has a through hole. The side shell is connected to the edge of the bottom shell. The side shell and the bottom shell form the second inner cavity. The rolling element is disposed between the side shell and the output disk and between the bottom shell and the output disk.

8. The reducer according to claim 7, characterized in that, Both the side shell and the bottom shell are provided with a plurality of second ball grooves. The rolling element includes a plurality of balls, which are embedded in the plurality of second ball grooves one by one and at least partially protrude from the second ball grooves. The output disk abuts against the plurality of balls.

9. The reducer according to claim 6, characterized in that, The output shaft is multiple, the cycloidal disk has multiple first connection holes, the output disk has multiple second connection holes, and each output shaft is connected to one first connection hole and one second connection hole.

10. The reducer according to claim 9, characterized in that, The multiple output shafts are arranged in a centrally symmetrical manner along the axis of the eccentric shaft.

11. A power device, characterized in that, include: A drive unit; and a reducer as described in any one of claims 1-10, wherein the drive unit is driveably connected to the power connection unit or the output unit.

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