A small-tooth-difference deceleration structure

Abstract

The application belongs to the technical field of mechanical transmission and relates to a few-tooth-difference speed reduction structure, which comprises an inner gear ring and one or more stages of speed reduction units arranged in the inner gear ring. The speed reduction unit comprises a power input shaft, a power output disc and a transition wheel. The power input shaft and the power output disc are coaxial with the inner gear ring and rotate relative to the inner gear ring. The outer circle of the power input shaft is eccentrically and movably arranged with driving teeth. The transition wheel is arranged between the driving teeth and the inner gear ring. The inner and outer sides of the transition wheel are respectively provided with coaxial outer teeth and inner teeth. The driving teeth are meshed with the inner teeth, and the outer teeth are meshed with the inner gear ring. The transition wheel is arranged on the end face of the power output disc and slides relative to the power output disc. The transition wheel is provided with a plurality of transmission holes, and the power output disc is fixedly provided with a transmission pin. The transition wheel transmits power to the power output disc through the transmission pin. The speed reducer in the application adopts a new type of multi-tooth meshing, has high transmission coincidence degree and high impact resistance, is completely different from the traditional planetary carrier structure in transmission form and realizes large speed ratio transmission.

Description

Technical Field

[0001] This invention belongs to the field of mechanical transmission technology and relates to a speed reduction structure with a small tooth difference. Background Technology

[0002] Wind energy is a clean and sustainable energy source, and wind power generation is gradually becoming an international industry and an important way for humankind to develop and utilize clean energy in the future. Due to the complexity of wind conditions, changes in wind direction and wind intensity can affect the operation of wind turbines. To ensure the normal operation of the overall wind turbine system, it is necessary to adjust the yaw and pitch reducer to keep the wind turbine system in good operating condition.

[0003] Currently, the first stage of yaw transmission adopts an NGW transmission structure, which generally consists of one sun gear and three planet gears. Multiple stages form a transmission system. After years of design, the size of the sun gear, planet gears and ring gear in the traditional structure cannot be reduced further. When used for high-speed rotation, the noise and vibration are relatively large. Due to the current structure, it is impossible to increase the power density again. Multi-stage combined transmission affects the efficiency of the gearbox and reduces transmission error. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to solve the above problems and provide a reduction structure with a small tooth difference.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A low-tooth-difference reduction structure includes an internal gear ring and one or more reduction units disposed within the internal gear ring. The reduction unit includes a power input shaft, a power output disc, and a transition wheel.

[0007] The power input shaft and power output disc are coaxial with the internal gear ring, and the power input shaft and power output disc rotate relative to the internal gear ring; the outer circle of the power input shaft is eccentrically fitted with a drive tooth, and a transition wheel is provided between the drive tooth and the internal gear ring; the inner and outer sides of the transition wheel are respectively provided with coaxially arranged external teeth and internal teeth, the drive tooth meshes with the internal teeth, and the external teeth mesh with the internal gear ring; the transition wheel is located on the end face of the power output disc and slides relative to it;

[0008] The transition wheel is provided with several transmission holes, and the power output disk is fixedly provided with a transmission pin, one end of which extends into the transmission hole; the transition wheel transmits power to the power output disk through the transmission pin.

[0009] Furthermore, there are multiple reduction units, and the power input shafts of adjacent reduction units are connected to the power output discs, forming a multi-stage reduction structure in series within the internal gear ring.

[0010] Furthermore, there is at least one drive tooth.

[0011] Furthermore, there are multiple drive teeth, which are distributed axially along the power input shaft, and the centers of the multiple drive teeth are distributed in a circle; at least two of the multiple drive teeth mesh with the transition wheel at the same time, and the included angle of the eccentric direction of any two drive teeth that mesh at the same time is not 180°.

[0012] Furthermore, a positioning pin is fixedly provided on the power output disc, and a limiting step is provided at one end of the positioning pin; the positioning pin passes through the transition wheel and limits the transition wheel axially through the limiting step.

[0013] Furthermore, a washer is provided between the power output disc and the transition wheel, and the transition wheel is supported by the washer.

[0014] Furthermore, both the power input shaft and the power output disk are equipped with interfaces for power input and output connection.

[0015] Furthermore, the power input shaft is provided with an eccentric section, and the drive gear is rotatably mounted on the eccentric section via a bearing.

[0016] Furthermore, the power output disc has a mounting hole at its center, and one end of the power input shaft is rotatably mounted in the mounting hole via a bearing.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The reducer in this invention adopts a novel multi-tooth meshing mechanism, which is completely different from the traditional planetary carrier structure, achieving a high speed ratio transmission. The number of transmission parts is reduced, the structure is simpler, more modular, and easier to maintain. The radial dimension is significantly reduced, and greater torque transmission can be achieved under the same size conditions. It replaces the traditional yaw and pitch planetary structure and better meets the requirements of equal strength design.

[0019] 2. This invention features a high degree of transmission overlap, low noise during high-speed operation, and high impact resistance; it also has a large transmission ratio, eliminating limitations imposed by the same module in the same class. The transmission method of this invention delivers higher power density than traditional NGW, and can reduce radial dimensions under the same size conditions.

[0020] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the low-tooth-difference reduction structure in this invention.

[0023] Figure 2 for Figure 1 A simplified structural diagram of the intermediate deceleration structure.

[0024] Figure 3 This is a schematic diagram of the application of the present invention to a wind power yaw pitch reducer.

[0025] Reference numerals in the attached diagram: 1-Internal gear ring; 2-Power input shaft; 3-Power output disc; 4-Drive gear; 5-Transition wheel; 6-Transmission pin; 7-Transmission hole; 8-Positioning pin; 9-Washer; 10-Positioning ring; 11-Wear-resistant shim. Detailed Implementation

[0026] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0028] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] Please see Figures 1-2This is a low-tooth-difference reduction structure, including an internal gear ring 1 and one or more reduction units disposed within the internal gear ring 1. The reduction unit includes a power input shaft 2, a power output disc 3, and a transition wheel 5. The power input shaft 2 and the power output disc 3 are coaxial with the internal gear ring 1, and the power input shaft 2 and the power output disc 3 rotate relative to the internal gear ring 1. The outer circle of the power input shaft 2 is eccentrically fitted with a drive tooth 4, and a transition wheel 5 is disposed between the drive tooth 4 and the internal gear ring 1. The inner and outer sides of the transition wheel 5 are respectively provided with coaxially arranged external teeth and internal teeth. The drive tooth 4 meshes with the internal teeth, and the external teeth mesh with the internal gear ring 1. The transition wheel 5 is disposed on the end face of the power output disc 3 and slides relative to it. The transition wheel 5 is provided with multiple transmission holes 7, and a transmission pin 6 is fixedly disposed on the power output disc 3, with one end of the transmission pin 6 extending into the transmission hole 7. The transition wheel 5 transmits power to the power output disc 3 through the transmission pin 6.

[0030] The reduction unit can be one or more. In the multiple reduction units, the power input shaft 2 of adjacent reduction units is connected to the power output disk 3 and connected in series in the internal gear ring 1 to form a multi-stage reduction structure.

[0031] Please see Figure 3 To apply the low-tooth-difference reduction structure of this invention to a wind turbine yaw and pitch reducer, a reduction unit is used. Specifically, the wind turbine yaw and pitch reducer includes a housing, a power input shaft 2 and a power output disk 3 coaxially arranged and rotatably engaged with the housing. An internal gear ring 1 concentric with the power input shaft 2 is fixedly arranged on the housing. A drive tooth 4 is eccentrically engaged with the outer circle of the power input shaft 2. A transition wheel 5 is arranged between the drive tooth 4 and the internal gear ring 1. External teeth and internal teeth are coaxially arranged on the inner and outer sides of the transition wheel 5, respectively. The drive tooth 4 meshes with the internal teeth, and the external teeth mesh with the internal gear ring 1 on the housing. Multiple transmission holes 7 are provided on the transition wheel 5. A transmission pin 6 is fixedly arranged on the power output disk 3, with one end of the transmission pin 6 extending into the transmission hole 7. The transition wheel 5 revolves around the center of the internal gear ring 1 while rotating on its own axis. During the rotation, the power is transmitted to the power output disk 3 through the transmission pin 6.

[0032] In this embodiment, a mounting hole is provided at the center of the power output disk 3, and one end of the power input shaft 2 is rotatably mounted in the mounting hole via a bearing. A wear-resistant gasket 11 is provided between the power input shaft 2 and the power output disk. Both the power input shaft 2 and the power output disk 3 are provided with interfaces for power input and output connection.

[0033] In this embodiment, an eccentric section is provided on the power input shaft 2, and the drive teeth 4 are rotatably mounted on the eccentric section via bearings. There are two drive teeth 4, distributed axially along the power input shaft 2, and axially positioned by a positioning ring 10. The centers of the two drive teeth 4 are circularly distributed, and the included angle between the eccentric directions is not 180°. Both drive teeth 4 mesh with the transition wheel 5 simultaneously. Using two drive teeth 4 increases the meshing tooth width, thereby improving the load-bearing capacity.

[0034] A positioning pin 8 is also fixedly installed on the power output disc 3. One end of the positioning pin 8 is provided with a limiting step. The positioning pin 8 passes through the transition wheel 5 and limits the transition wheel 5 axially through the limiting step.

[0035] A washer 9 is provided between the power output disc 3 and the transition wheel 5, and the transition wheel 5 is supported by the washer 9. During the rotation of the transition wheel 5, it slides with the washer 9. Therefore, the washer 9 is made of wear-resistant material.

[0036] The housing has removable front and rear covers bolted to its sides. An adapter shaft is installed inside the front cover, rotatably mounted within it via bearings, and connected to the power input shaft 2, thus transmitting power while supporting the power input shaft 2. An output shaft is installed inside the rear cover, rotatably mounted within it via bearings, and connected to the power output disc 3 via a spline connection, thus transmitting power while supporting the power output disc 3.

[0037] Figure 3 This is a simplified structural diagram of the embodiment. The speed ratio of the wind turbine yaw and pitch reducer in this embodiment is calculated as follows:

[0038]

[0039]

[0040] From the simplified structural diagram, we can see that n c =n d n e =0, therefore:

[0041] Simplifying (1) and (2), we get:

[0042]

[0043]

[0044] Note: Z a and Z b With the same number of teeth, their function is to increase the meshing tooth width and improve load-bearing capacity.

[0045] The number of teeth on each gear is Z. a =25, Z c=27, Z d =115, Z e =117, the internal gear module of the driving gear 4 and the transition gear 5 is 3, and the external gear and internal gear ring 1 of the transition gear 5 are 1.5. Substituting into equation (8), the result is: 10.123.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A reduction gear structure with a small tooth difference, characterized in that: It includes an internal gear ring and one or more reduction units disposed within the internal gear ring, wherein the reduction unit includes a power input shaft, a power output disc, and a transition wheel; The power input shaft and power output disc are coaxial with the internal gear ring, and the power input shaft and power output disc rotate relative to the internal gear ring; the outer circle of the power input shaft is eccentrically fitted with a drive tooth, and a transition wheel is provided between the drive tooth and the internal gear ring; the inner and outer sides of the transition wheel are respectively provided with coaxially arranged external teeth and internal teeth, the drive tooth meshes with the internal teeth, and the external teeth mesh with the internal gear ring; the transition wheel is located on the end face of the power output disc and slides relative to it; The transition wheel is provided with several transmission holes, and the power output disk is fixedly provided with a transmission pin, one end of which extends into the transmission hole; the transition wheel transmits power to the power output disk through the transmission pin. There are multiple drive teeth, which are distributed axially along the power input shaft, and the centers of the multiple drive teeth are distributed in a circle; at least two of the multiple drive teeth are engaged with the transition wheel at the same time, and the included angle of the eccentric direction of any two drive teeth engaged at the same time is not 180°. The power output disc is also fixedly provided with a positioning pin, and one end of the positioning pin is provided with a limiting step; the positioning pin passes through the transition wheel and limits the transition wheel axially through the limiting step.

2. The low-tooth-difference reduction structure according to claim 1, characterized in that: There are multiple reduction units. The power input shafts of adjacent reduction units are connected to the power output discs and are connected in series in the internal gear ring to form a multi-stage reduction structure.

3. The low-tooth-difference reduction structure according to claim 1, characterized in that: A washer is provided between the power output disc and the transition wheel, and the transition wheel is supported by the washer.

4. The low-tooth-difference reduction structure according to claim 1, characterized in that: Both the power input shaft and the power output disk are equipped with interfaces for power input and output connection.

5. The low-tooth-difference reduction structure according to claim 1, characterized in that: The power input shaft is provided with an eccentric section, and the drive gear is rotatably mounted on the eccentric section via a bearing.

6. The low-tooth-difference reduction structure according to claim 1, characterized in that: The power output disc has a mounting hole at its center, and one end of the power input shaft is rotatably mounted in the mounting hole via a bearing.

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