Deviation reducer

Abstract

The utility model provides a deflection reducer, and relates to the field of gear boxes. The deflection reducer comprises an input assembly, a transmission assembly and an output assembly. The input assembly comprises an input shell and an input shaft, and the input shaft and the input shell are rotationally matched. The transmission assembly comprises a center wheel, a planet wheel, a first gear ring and a second gear ring, and the center wheel is connected with the input shaft; the first gear ring is fixedly connected with the input shell, and the planet wheel is meshed with the center wheel and the first gear ring at the same time. The second gear ring is in transmission connection with the output assembly, and the planet gear is meshed with the second gear ring. The speed reducer is simple in structure, small in number of parts, small in overall size, light in weight, convenient to assemble and low in machining and manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the field of gear boxes, in particular to a skew reducer. Background Art

[0002] The yaw reducer is a combination of the yaw reducer and the pitch reducer. The yaw reducer is an important component of a wind turbine and is used to adjust the angle of the nacelle and blades. Due to the harsh working conditions, inconvenient maintenance, and small installation space, the yaw reducer has strict requirements on reliability, weight, and dimensions.

[0003] The inventors have found that the prior art eccentric reducer has at least the following disadvantages:

[0004] Since yaw pitch control requires a high gearbox speed ratio, traditional yaw reducers generally use a multi-stage planetary structure. For example, the pitch gearbox uses 3 stages, and the yaw gearbox uses 4-5 stages. This results in the gearbox having many parts, large size and weight, high cost, and inconvenient assembly. Utility Model Content

[0005] The utility model aims to provide a skew reducer, which can simplify the structure, reduce the number of parts, reduce the size, reduce the weight, reduce the cost, and improve the convenience of assembly.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In a first aspect, the utility model provides a skew reducer, comprising:

[0008] An input assembly, a transmission assembly and an output assembly; the input assembly includes an input housing and an input shaft, and the input shaft is rotatably matched with the input housing; the transmission assembly includes a center wheel, planetary wheels, a first gear ring and a second gear ring, and the center wheel is connected to the input shaft; the first gear ring is fixedly connected to the input housing, and the planetary wheels are meshed with the center wheel and the first gear ring at the same time; the second gear ring is transmission-connected to the output assembly, and the planetary wheels are meshed with the second gear ring.

[0009] In an optional embodiment, the degree of freedom of the planetary gears and the central gear in the axial direction of the central gear is limited.

[0010] Based on the above scheme, the position of the planetary gear in its own axial direction is stable, the meshing area between the planetary gear and the center wheel, the first gear ring and the second gear ring is large, and it is not easy to slip or suffer from severe local wear. The entire mechanism operates stably and reliably, reduces the failure rate, has a long service life and low operating costs.

[0011] In an optional embodiment, the planetary gear has a first end face and a second end face in its axial direction, and a lubricating oil groove is provided on the first end face or the second end face.

[0012] Based on the above scheme, the lubricating oil can be stored in the lubricating oil groove. The lubricating oil groove mainly plays the role of lubricating the end face of the planetary gear. The end face of the planetary gear has relative movement with the axial limit. The lubricating oil groove can reduce wear.

[0013] In an optional embodiment, the input shaft is provided with a first limiting step, and the first end face cooperates with the first limiting step to limit the freedom of the planetary gear in a first direction; the output assembly is provided with a second limiting step, and the second end face cooperates with the second limiting step to limit the freedom of the planetary gear in a second direction opposite to the first direction.

[0014] Based on the above solution, the first limiting step and the second limiting step cooperate to limit the position of the planetary gear relative to the sun gear in its axial direction, so that the position and operation of the planetary gear are stable.

[0015] In an optional embodiment, the lubricating oil groove is configured as an annular groove arranged around the axis of the planetary gear.

[0016] Based on the above solution, the effective storage area of ​​the lubricating oil tank is large, and more lubricating oil can be stored, thereby further reducing wear.

[0017] In an optional embodiment, a first wear-resistant ring is provided on the input housing, and the first wear-resistant ring cooperates with the first end face to limit the freedom of the planetary gear in a first direction; a second wear-resistant ring is provided on the second ring gear, and the second wear-resistant ring cooperates with the second end face to limit the freedom of the planetary gear in a second direction opposite to the first direction.

[0018] Based on the above scheme, the first wear-resistant ring and the second wear-resistant ring cooperate to limit the position of the planetary gear relative to the sun gear in its axial direction. The position and operation of the planetary gear are stable. The planetary gear revolves around the axis of the center wheel while rotating. During the revolution of the planetary gear, it is always in contact with the first wear-resistant ring and the second wear-resistant ring, and is not easy to wear the input housing and the second gear ring.

[0019] In an optional embodiment, a first positioning protrusion is provided on the first end surface, and a second positioning protrusion is provided on the second end surface, the first positioning protrusion abuts and cooperates with the first wear-resistant ring, and the second positioning protrusion abuts and cooperates with the second wear-resistant ring; the lubricating oil groove is provided on the first positioning protrusion or the second positioning protrusion.

[0020] Based on the above solution, during assembly, the first positioning protrusion on the planetary gear contacts the first wear-resistant ring of the input housing, and the second positioning protrusion on the planetary gear contacts the second wear-resistant ring on the second gear ring, which facilitates the determination of the installation position of the planetary gear and improves the assembly efficiency. In addition, the design of the first positioning protrusion and the second positioning protrusion can compensate for the errors in the processing and manufacturing of parts and improve the assembly quality.

[0021] In an optional embodiment, the outer circumferential surface of the planetary wheel is provided with a first tooth portion and a second tooth portion arranged in the axial direction of the planetary wheel, the first tooth portion is meshed with the first gear ring, and the second tooth portion is meshed with the second gear ring.

[0022] Based on the above solution, the first tooth portion and the second tooth portion cooperate with the first gear ring and the second gear ring respectively, and the transmission ratio is designed according to requirements. The manufacturing is flexible and the application range is wide.

[0023] In an optional embodiment, the tooth tip diameter of the first tooth portion is different from the tooth tip diameter of the second tooth portion.

[0024] Based on the above scheme, the transmission ratio can be set as needed, the processing and manufacturing are flexible, and the application range is wide.

[0025] In an optional embodiment, the transmission assembly further includes a planetary transmission mechanism, an input portion of the planetary transmission mechanism is drivingly connected to the input shaft, and an output portion of the planetary transmission mechanism is drivingly connected to the center wheel.

[0026] Based on the above solution, by setting a planetary transmission mechanism, the transmission ratio and output torque can be adjusted as needed to meet the speed ratio requirements of different scenarios and have a wide range of uses.

[0027] The beneficial effects of the embodiments of the utility model are:

[0028] In summary, the eccentric reducer provided in this embodiment achieves multi-stage speed ratio adjustment and meets the output speed ratio requirements by meshing the planetary gear with the first gear ring and the second gear ring at the same time. In addition, the planetary gear is clamped between the center gear and the first gear ring, and the planetary gear is driven by a center gear and outputs the torque through the second gear ring. Compared with the traditional multi-stage planetary transmission structure, two planetary carriers and at least one sun gear can be reduced, and the bearings and other structures required for installing the planetary carrier and the sun gear can be reduced accordingly, and some parts are reduced, the structure is simplified, and the overall structure is more compact, small in size, light in weight, and easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of a skew-variable reducer according to an embodiment of the utility model;

[0031] Figure 2 It is a schematic diagram of a first variation of the eccentric reducer of an embodiment of the utility model;

[0032] Figure 3 It is a schematic diagram of a second variation of the eccentric reducer of the embodiment of the utility model;

[0033] Figure 4 It is a schematic diagram of a third variation of the eccentric reducer of an embodiment of the utility model.

[0034] icon:

[0035] 100-input assembly; 110-input housing; 120-input shaft; 121-first limiting step; 122-first wear-resistant ring; 200-transmission assembly; 210-center wheel; 220-planetary gear; 221-first positioning protrusion; 222-second positioning protrusion; 223-lubricating oil groove; 224-first tooth portion; 225-second tooth portion; 230-first ring gear; 240-second ring gear; 241-second wear-resistant ring; 250-planetary transmission mechanism; 251-sun gear; 252-planet carrier; 253-planetary gear; 254-inner ring gear; 300-output assembly; 310-output housing; 320-output shaft; 321-second limiting step; 330-support bearing. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the prior art, in order to achieve a large speed ratio transmission, a multi-stage planetary transmission structure is set between the input spline shaft and the output spline shaft of the eccentric reducer. The multi-stage planetary transmission structure is arranged in sequence in the axial direction of the input spline shaft or the output spline shaft. Each stage of the planetary transmission structure includes mutually matching components such as a sun gear, a planetary gear 253, a planetary bracket, a transmission gear ring and a support bearing 330. In this way, after the multi-stage planetary transmission structure is matched, the entire gear box has many components, a large overall volume, a heavy weight, a high cost, and is inconvenient to assemble.

[0043] In view of this, the designer provides a skew reducer, which can reduce the size of the reducer, reduce the overall weight, reduce the difficulty of assembly, and reduce manufacturing costs by reducing parts.

[0044] Please combine Figure 1 In this embodiment, the eccentric reducer includes an input assembly 100, a transmission assembly 200 and an output assembly 300; the input assembly 100 includes an input housing 110 and an input shaft 120, and the input shaft 120 is rotatably matched with the input housing 110; the transmission assembly 200 includes a center wheel 210, a planetary wheel 220, a first ring gear 230 and a second ring gear 240, and the center wheel 210 is connected to the input shaft 120; the first ring gear 230 is fixedly connected to the input housing 110, and the planetary wheel 220 is meshed with the center wheel 210 and the first ring gear 230 at the same time; the second ring gear 240 is transmission-connected to the output assembly 300, and the planetary wheel 220 is meshed with the second ring gear 240.

[0045] Based on the above, the operation process of the eccentric reducer provided in this embodiment is as follows:

[0046] The input shaft 120 is connected to the motor. After the motor is started, the input shaft 120 transmits the torque to the center wheel 210, and the center wheel 210 drives the planetary wheel 220 to rotate. The planetary wheel 220 rotates around its own axis and revolves around the axis of the center wheel 210 under the limitation of the first ring gear 230. When the planetary wheel 220 rotates and revolves, the torque is transmitted to the second ring gear 240, and the second ring gear 240 drives the output assembly 300 to move, and the torque is output through the output assembly 300. The planetary gear 220 is clamped between the center wheel 210 and the first ring gear 230. The planetary gear 220 is not configured with a planetary stage. The planetary gear 220 is driven by the center wheel 210 and outputs the torque through the second ring gear 240. Compared with the traditional multi-stage planetary transmission structure, it can reduce two planetary carriers 252 and at least one sun gear 251, and correspondingly reduce the bearings and other structures required for installing the planetary carrier 252 and the sun gear 251, reduce some parts, simplify the structure, and make the overall structure more compact, small in size, light in weight, and easy to assemble.

[0047] The following embodiments illustrate the detailed structure of the eccentric reducer provided in the present application by way of examples.

[0048] In this embodiment, optionally, the input shaft 120 can be transmission-connected to the center wheel 210 through a structure such as a spline, or the two can be transmission-connected through an embedded structure, so that the input shaft 120 can drive the center wheel 210 to rotate together.

[0049] Please combine Figure 1In this embodiment, the number of the planetary gears 220 can be set as needed. For example, the number of the planetary gears 220 can be three, and the three planetary gears 220 are arranged around the central wheel 210. Each planetary gear 220 has a first end face and a second end face opposite to each other in the axial direction thereof, and a lubricating oil groove 223 is provided on the first end face or the second end face, that is, the lubricating oil groove 223 can be provided only on the first end face or the second end face, or the lubricating oil groove 223 can be provided on both the first end face and the second end face. With such a design, the lubricating oil liquid can be stored in the lubricating oil groove 223, and the wear of the end face of the planetary gear is small during operation.

[0050] Please combine Figure 1 Optionally, after the planetary gear 220 is installed outside the center wheel 210, the freedom of the planetary gear 220 and the center wheel 210 in the axial direction of the center wheel 210 is limited, so that the planetary gear 220 is stably and reliably combined with the center wheel 210, the first gear ring 230 and the second gear ring 240 in the axial direction. During operation, the position of the planetary gear 220 in its own axial direction is stable, and the meshing area of ​​the planetary gear 220 and the center wheel 210, the first gear ring 230 and the second gear ring 240 is large, and it is not easy to slip or severely wear locally. The whole mechanism operates stably and reliably, reduces the failure rate, has a long service life, and has low operating costs.

[0051] It is worth noting that the implementation scheme of limiting the axial freedom of the planetary gear 220 is flexible and diverse. Two technical solutions that can achieve axial limitation of the planetary gear 220 are exemplified below.

[0052] Please combine Figure 1 In an optional embodiment, the input shaft 120 is provided with a first limiting step 121, which is an annular step, and the first end face cooperates with the first limiting step 121 to limit the freedom of the planetary gear 220 in the first direction. The output assembly 300 is provided with a second limiting step 321, which is an annular step, and the second end face cooperates with the second limiting step 321 to limit the freedom of the planetary gear 220 in the second direction opposite to the first direction. The first limiting step 121 and the second limiting step 321 cooperate to limit the position of the planetary gear 220 relative to the sun gear 251 in its axial direction, and the position of the planetary gear 220 is stable and the operation is stable. In this embodiment, the number of the lubricating oil grooves 223 can be multiple, and the lubricating oil grooves 223 can be set as an annular groove arranged around the axis of the planetary gear 220, which can increase the oil storage capacity and further reduce the wear of the end face of the planetary gear 220.

[0053] Please combine Figure 2 or Figure 3In another optional embodiment, a first wear-resistant ring 122 is provided on the input housing 110, and the first wear-resistant ring 122 cooperates with the first end face to limit the freedom of the planetary gear 220 in the first direction; a second wear-resistant ring 241 is provided on the second gear ring 240, and the second wear-resistant ring 241 cooperates with the second end face to limit the freedom of the planetary gear 220 in the second direction opposite to the first direction. Further, a first positioning protrusion 221 is provided on the first end face, and a second positioning protrusion 222 is provided on the second end face, and the first positioning protrusion 221 abuts against the first wear-resistant ring 122, and the second positioning protrusion 222 abuts against the second wear-resistant ring 241. During assembly, the first positioning protrusion 221 on the planetary gear 220 contacts the first wear-resistant ring 122 of the input housing 110, and the second positioning protrusion 222 on the planetary gear 220 contacts the second wear-resistant ring 241 on the second gear ring 240, which facilitates the determination of the installation position of the planetary gear 220 and has high assembly efficiency. Moreover, the design of the first positioning protrusion 221 and the second positioning protrusion 222 can compensate for the error in the processing and manufacturing of parts and improve the assembly quality. In this embodiment, the lubricating oil groove can be set on the first positioning protrusion 221 and the second positioning protrusion 222, and the form of the lubricating oil groove can be set as needed, such as an annular groove or a linear groove.

[0054] Please combine Figure 3 Optionally, the outer circumferential surface of the planetary gear 220 is provided with a first tooth portion 224 and a second tooth portion 225 arranged in the axial direction of the planetary gear 220, the first tooth portion 224 meshes with the first gear ring 230, and the second tooth portion 225 meshes with the second gear ring 240. The first tooth portion 224 and the second tooth portion 225 can be formed on the outer circumferential surface of a gear at the same time, or, in other embodiments, the first tooth portion 224 and the second tooth portion 225 are respectively formed on two gears, and then the two gears are welded and fixed together to form a planetary gear 220.

[0055] Furthermore, the tooth top diameter D1 of the first tooth portion 224 is different from the tooth top diameter D2 of the second tooth portion 225. For example, in this embodiment, the tooth top diameter D1 of the first tooth portion 224 is greater than the tooth top diameter D2 of the second tooth portion 225.

[0056] In this embodiment, optionally, the output assembly 300 includes an output housing 310, an output shaft 320 and a support bearing 330, the output housing 310 is fixedly connected to the first gear ring 230, the output shaft 320 is rotatably matched with the output housing 310 through the support bearing 330, the second gear ring 240 can be transmission-connected to the output shaft 320 through a structure such as a spline, the torque is transmitted to the output shaft 320 through the second gear ring 240, and the final output of the torque is achieved through the output shaft 320. The second limiting step 321 is provided on the output shaft 320.

[0057] It should be noted that the variable speed reducer provided in this embodiment can realize a transmission mode with a single-stage speed ratio exceeding 200 through the cooperation of multiple gears to meet the speed ratio requirements of the variable pitch gearbox.

[0058] Please combine Figure 4 In other embodiments, the transmission assembly 200 may further include a planetary transmission mechanism 250, the input portion of the planetary transmission mechanism 250 is transmission-connected to the input shaft 120, and the output portion of the planetary transmission mechanism 250 is transmission-connected to the center wheel 210. By providing the planetary transmission mechanism 250, the transmission ratio and the output torque can be adjusted as needed to meet the speed ratio requirements of different scenarios, and the application range is wide.

[0059] For example, the planetary transmission mechanism 250 includes a sun gear 251, a planet carrier 252, a planetary gear 253 and an inner gear ring 254. The sun gear 251 is installed between the input shaft 120 and the center wheel 210, and the input shaft 120 and the sun gear 251 can be set to interference fit, spline connection or integral connection. The planet carrier 252 is sleeved on the outside of the center wheel 210 and the two can be connected by splines, and the planetary gear 253 and the planet carrier 252 are rotatably matched. The inner gear ring 254 is fixed between the input housing 110 and the first gear ring 230, or the inner gear ring 254 and the first gear ring 230 are set to an integral structure. The planetary gear 253 is meshed with the sun gear 251 and the inner gear ring 254 at the same time. After the input shaft 120 receives power input, the sun gear 251 drives the planetary gear 253 to rotate, and the inner ring gear 254 and the planetary gear 253 cooperate to output torque to the planetary carrier 252, and the planetary carrier 252 drives the center wheel 210 to rotate, and then the torque continues to be transmitted.

[0060] The eccentric reducer provided in this embodiment eliminates multiple parts, simplifies the structure, reduces the overall volume, reduces the overall weight, and reduces the processing and manufacturing costs.

[0061] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A skew reducer, characterized in that: include: An input assembly (100), a transmission assembly (200) and an output assembly (300); the input assembly (100) comprises an input housing (110) and an input shaft (120), and the input shaft (120) is rotatably matched with the input housing (110); the transmission assembly (200) comprises a center wheel (210), planetary wheels (220), a first ring gear (230) and a second ring gear (240), and the center wheel (210) is connected to the input shaft (120); the first ring gear (230) is fixedly connected to the input housing (110), and the planetary wheels (220) are meshed with the center wheel (210) and the first ring gear (230) at the same time; the second ring gear (240) is transmission-connected to the output assembly (300), and the planetary wheels (220) are meshed with the second ring gear (240).

2. The eccentric reducer according to claim 1, characterized in that: The degrees of freedom of the planetary gears (220) and the central gear (210) in the axial direction of the central gear (210) are restricted.

3. The eccentric reducer according to claim 1, characterized in that: The planetary gear (220) has a first end surface and a second end surface in its axial direction, and a lubricating oil groove (223) is provided on the first end surface or the second end surface.

4. The eccentric reducer according to claim 3, characterized in that: The input shaft (120) is provided with a first limiting step (121), and the first end face cooperates with the first limiting step (121) to limit the degree of freedom of the planetary gear (220) in a first direction; the output assembly (300) is provided with a second limiting step (321), and the second end face cooperates with the second limiting step (321) to limit the degree of freedom of the planetary gear (220) in a second direction opposite to the first direction.

5. The eccentric reducer according to claim 4, characterized in that: The lubricating oil groove (223) is configured as an annular groove arranged around the axis of the planetary gear (220).

6. The eccentric reducer according to claim 3, characterized in that: The input housing (110) is provided with a first wear-resistant ring (122), and the first wear-resistant ring (122) cooperates with the first end surface to limit the freedom of the planetary gear (220) in a first direction; the second ring gear (240) is provided with a second wear-resistant ring (241), and the second wear-resistant ring (241) cooperates with the second end surface to limit the freedom of the planetary gear (220) in a second direction opposite to the first direction.

7. The eccentric reducer according to claim 6, characterized in that: A first positioning protrusion (221) is provided on the first end surface, and a second positioning protrusion (222) is provided on the second end surface; the first positioning protrusion (221) is in abutment with the first wear-resistant ring (122), and the second positioning protrusion (222) is in abutment with the second wear-resistant ring (241); the lubricating oil groove (223) is provided on the first positioning protrusion (221) or the second positioning protrusion (222).

8. The eccentric reducer according to claim 1, characterized in that: The outer peripheral surface of the planetary gear (220) is provided with a first tooth portion (224) and a second tooth portion (225) arranged in the axial direction of the planetary gear (220), the first tooth portion (224) meshes with the first gear ring (230), and the second tooth portion (225) meshes with the second gear ring (240).

9. The eccentric reducer according to claim 8, characterized in that: The tooth tip diameter of the first tooth portion (224) is different from the tooth tip diameter of the second tooth portion (225).

10. The eccentric reducer according to claim 1, characterized in that: The transmission assembly (200) further comprises a planetary transmission mechanism (250), wherein an input portion of the planetary transmission mechanism (250) is transmission-connected to the input shaft (120), and an output portion of the planetary transmission mechanism (250) is transmission-connected to the center wheel (210).

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