Connecting structure of wind power gear box and main shaft system

Abstract

The utility model discloses a connecting structure of a wind power gear box and a main shaft system, which comprises a friction gasket which is provided with a central hole, is arranged between a planet carrier of the wind power gear box and a main shaft of the main shaft system and is divided into a plurality of independent sub-gaskets, and a plurality of pin holes are uniformly distributed on each sub-gasket; the connecting pieces are used for connecting the sub-gaskets with the planet carrier; the sealing pieces comprise the first sealing piece and the second sealing piece, the first sealing piece is arranged in the circumferential direction of the edge of the center hole of the friction gasket, and the second sealing piece is arranged in the circumferential direction of the periphery of the friction gasket. The split type friction gasket is adopted, the friction coefficient of the combination face of the main shaft and the planet carrier is increased, and meanwhile manufacturing is easy, transportation is convenient, installation is convenient and fast, and maintenance is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbine sets, in particular to a connection structure between a wind turbine gear box and a main shaft system. Background Art

[0002] For the fully integrated wind turbine transmission chain, the wind turbine gearbox mainly includes a primary planetary gear train and a secondary planetary gear train. The primary planetary gear train mainly includes structures such as a planetary carrier, planetary gears and an inner gear ring. The main shaft system mainly includes structures such as a main shaft, a bearing seat, an upwind bearing and a downwind bearing. The connection between the main shaft system and the gearbox is mainly the connection between the planetary carrier and the main shaft. The existing connection method uses a large number of bolts and bearing pins to transmit force and torque. The ability to transmit force and torque depends on the specifications and number of bolts and bearing pins on the one hand, and on the friction coefficient of the joint surface between the main shaft and the planetary carrier on the other hand. In the prior art, there is also an integrated friction gasket designed between the main shaft and the planetary carrier, but for high-power wind turbine transmission chains, the outer diameter of the adapted friction gasket is greater than 1000mm and the thickness is only about 0.6mm. There are many problems in manufacturing, storage, transportation and installation. Utility Model Content

[0003] In order to solve the deficiencies of the prior art, the present application provides a connection structure between a wind turbine gearbox and a main shaft system, including:

[0004] A friction gasket having a central hole, arranged between the planetary carrier of the wind turbine gearbox and the main shaft of the main shaft system, and divided into a plurality of independent sub-gaskets, each of which has a plurality of pin holes uniformly distributed thereon;

[0005] A connecting member, including a plurality of connecting members, for connecting the sub-gasket to the planet carrier;

[0006] The sealing member comprises a first sealing member and a second sealing member, wherein the first sealing member is arranged circumferentially along the edge of the central hole of the friction pad, and the second sealing member is arranged circumferentially along the outer periphery of the friction pad.

[0007] Furthermore, a gap is formed between two adjacent groups of sub-gaskets, and the gap distance is 3-5 mm.

[0008] Furthermore, the position and number of the pin holes on each of the sub-gaskets are consistent.

[0009] Furthermore, the connecting member is constructed as a rivet, and mounting holes corresponding to the positions are respectively arranged on the sub-gasket and the planet carrier, and the rivet is arranged in the mounting hole.

[0010] Furthermore, the friction gasket is divided into eight groups of sub-gaskets of the same size in a sector shape.

[0011] Furthermore, the sub-gasket includes a base layer, two side surfaces of the base layer are provided with a friction layer, and a plurality of friction particles are arranged on the friction layer.

[0012] Furthermore, the base layer is made of spring steel, the friction layer is a nickel-phosphorus alloy coating, and the friction particles are diamond particles.

[0013] Furthermore, the thickness of the base layer is 0.5±0.02 mm, the thickness of the friction layer is 20±2 μm, and the diameter of the friction particles is 36±2 μm.

[0014] Furthermore, the planet carrier is provided with threaded holes whose number and positions correspond to the pin holes, a hollow pin is arranged in the pin hole, a stud is arranged in the hollow pin, one end of the stud is threadedly connected to the threaded hole of the planet carrier, and the other end is connected to the main shaft through a nut.

[0015] Furthermore, the seal also includes a third seal and a fourth seal, and the third seal and the fourth seal are arranged in parallel at the axial connection between the planet carrier and the main shaft.

[0016] The connection structure between the wind turbine gearbox and the main shaft system of the present application has the following beneficial effects:

[0017] (1) The use of friction gaskets to increase the friction coefficient of the joint surface can reduce the specifications and quantity of connecting bolts and load-bearing pins, thereby achieving the effect of reducing weight and cost;

[0018] (2) A sealing structure is designed on the mounting surface of the friction gasket to solve the oil leakage problem of the split friction gasket and improve the sealing performance of the product;

[0019] (3) The friction gasket is connected to the planetary carrier by rivets, which plays a fixing role and is convenient for installation;

[0020] (4) Compared with the integral friction gasket, the split structure has advantages in manufacturing, transportation, storage, installation, and maintenance. During maintenance, one sub-gasket can be replaced individually, reducing the cost of replacing parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the connection between the wind turbine gearbox and the main shaft system;

[0022] Figure 2 for Figure 1 Sectional view;

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 for Figure 3Schematic diagram of the structure of the middle friction pad;

[0025] Figure 5 This is a schematic diagram of the planet carrier structure;

[0026] Figure 6 This is a schematic diagram of the main axis structure.

[0027] The markings in the figure are: 10, wind power gear box, 11, inner gear ring, 12, planet carrier, 121, connecting boss, 122, threaded hole, 123, first sealing groove, 124, second sealing groove, 13, planet gear;

[0028] 20. spindle system, 21. bearing seat, 22. spindle, 221. groove, 222. through hole, 23. upwind bearing, 24. downwind bearing;

[0029] 30. Friction gasket, 31. Sub-gasket, 311. Pin hole, 312. Mounting hole, 313. Ejection hole, 32. Hollow pin, 33. Rivet, 34. First sealing ring, 35. Second sealing ring, 36. Stud, 37. Third sealing ring, 38. Fourth sealing ring. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0033] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0034] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] See also Figure 1-Figure 6 The present embodiment provides a connection structure between a wind turbine gearbox and a main shaft system. The wind turbine gearbox 10 mainly includes an inner gear ring 11, a planet carrier 12, and a planetary gear 13. Other structures are not described here as prior art. The planetary gear 13 includes a plurality of planetary gears 13 and is circumferentially arranged on the planet carrier 12 through a bearing. The inner gear ring 11 is meshed with a plurality of planetary gears at the same time. The main shaft system 20 includes a bearing seat 21, a main shaft 22, an upwind bearing 23, and a downwind main shaft 24. The two ends of the main shaft 22 are respectively connected to An upwind bearing 23 and a downwind bearing 24 are installed in the bearing seat 21, wherein a friction gasket 30 is arranged between the main shaft 22 and the planetary carrier 12. The friction gasket 30 is an annular structure with a center hole, and is divided into a split structure of multiple sub-gaskets 31. A plurality of pin holes 311 with the same position and number are evenly distributed on each sub-gasket 31 for installing a hollow pin 32. A mounting hole 312 is opened on each sub-gasket, and a rivet 33 is arranged in the mounting hole for connecting with the planetary carrier 12.

[0037] Preferably, six groups of pin holes 311 and two groups of mounting holes 312 are formed on each sub-gasket, and a consistent number of mounting holes are formed at the same position on the planet carrier for rivets 33 to mount the gasket on the planet carrier.

[0038] Specifically, the friction gasket 30 is divided into eight groups of sub-gaskets 31 of the same size in a fan shape, that is, the dividing line does not pass through the center of the circle, so as to avoid the situation where one pin hole 311 connects two adjacent groups of sub-gaskets at the same time, and also to avoid the situation where the same bolt connects two groups of sub-gaskets, otherwise it will cause unstable torque transmission, and a gap will be formed between two adjacent sub-gaskets 31, and the gap range is 3-5mm.

[0039] More specifically, the sub-gasket 31 includes a base layer, a friction layer is provided on two sides of the base layer, a plurality of friction particles are arranged on the friction layer, the base layer is made of spring steel (65Mn), the friction layer is a nickel-phosphorus alloy coating, the friction particles are diamond particles, the thickness of the base layer is 0.5±0.02mm, the thickness of the friction layer is 20±2μm, the diameter of the friction particles is 36±2μm, and the coverage rate of the diamond particles on the nickel-phosphorus alloy coating is 20-30%.

[0040] Since the lubrication method of the upwind bearing 23 and the downwind bearing 24 is forced lubrication, when the fan is running, a large amount of lubricating oil will be sprayed onto the upwind bearing and the downwind bearing, and the lubricating oil will gather in the cavity formed by the main shaft and the bearing seat under the action of gravity. However, considering the impact on the environment, the lubricating oil is not allowed to flow to the inner hole area of ​​the main shaft. However, since the friction gasket in the present application is a split structure and there is a gap, a first sealing groove 123 is circumferentially opened on the planetary carrier at the inner side of the center hole of the friction gasket, and a first sealing ring 34 is arranged in the first sealing groove, and a second sealing groove 124 is circumferentially opened at the outer periphery of the friction gasket, and a second sealing ring 35 is arranged in the second sealing groove.

[0041] A groove 221 is provided inwardly on the end surface where the main shaft 22 is connected to the planetary carrier, and a connecting boss 121 is provided on the planetary carrier 12. The friction gasket 30 is arranged between the connecting boss 121 and the bottom wall of the groove. At least a portion of the connecting boss 121 is embedded in the groove. Threaded holes 122 corresponding in number and position to the pin hole 311 are provided on the connecting end surface of the connecting boss, and a through hole 222 is provided in the groove 221. During installation, the hollow pin 32 is first passed through the through hole 222, the pin hole 311 and the threaded hole 122, and then a stud 36 with external threads at both ends is installed in the hollow pin 32. One end of the stud 36 is screwed into the threaded hole 122, and the other end is tightened by a nut.

[0042] In addition, a third sealing ring 37 and a fourth sealing ring 38 are arranged in parallel on the axial connection surface between the connecting boss 121 and the main shaft 22 to further seal and prevent oil leakage.

[0043] See also Figure 4 and Figure 5 As can be seen from the figure, there are four ejection holes 313 with smaller diameters in the pin hole 311 on the partial sub-gasket. The ejection holes 313 are not equipped with hollow pins 32, but are directly tightened with studs and nuts. The purpose is to facilitate the ejection of the main shaft and the planetary carrier through the studs during disassembly.

[0044] The installation between the wind turbine gearbox 10 and the main shaft system is not only the installation between the main shaft 22 and the planetary carrier 12, but also the installation between the bearing seat 21 and the inner gear ring 11. Bolt holes corresponding in number and position are circumferentially opened on the connecting end faces of the inner gear ring 11 and the bearing seat 21, and bolts are arranged in the bolt holes to connect the two. In addition, a pin hole is opened between two adjacent groups of bolt holes, and a solid load-bearing pin is directly installed in the pin hole.

[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A connection structure between a wind turbine gearbox and a main shaft system, characterized in that: include: A friction gasket having a central hole, arranged between the planetary carrier of the wind turbine gearbox and the main shaft of the main shaft system, and divided into a plurality of independent sub-gaskets, each of which has a plurality of pin holes uniformly distributed thereon; A connecting member, including a plurality of connecting members, for connecting the sub-gasket to the planet carrier; The sealing member comprises a first sealing member and a second sealing member, wherein the first sealing member is arranged circumferentially along the edge of the central hole of the friction pad, and the second sealing member is arranged circumferentially along the outer periphery of the friction pad.

2. The connection structure between the wind turbine gearbox and the main shaft system according to claim 1, characterized in that: A gap is formed between two adjacent groups of sub-gaskets, and the gap distance is 3-5 mm.

3. The connection structure between the wind turbine gearbox and the main shaft system according to claim 1, characterized in that: The position and quantity of the pin holes on each of the sub-gaskets are consistent.

4. The connection structure between the wind turbine gearbox and the main shaft system according to claim 1, characterized in that: The connecting member is constructed as a rivet, and mounting holes corresponding to the positions are respectively arranged on the sub-gasket and the planet carrier, and the rivet is arranged in the mounting hole.

5. The connection structure between the wind turbine gearbox and the main shaft system according to claim 1, characterized in that: The friction gasket is divided into eight groups of sub-gaskets of the same size in a sector shape.

6. The connection structure between the wind turbine gearbox and the main shaft system according to claim 1, characterized in that: The sub-gasket comprises a base layer, two sides of the base layer are provided with friction layers, and a plurality of friction particles are arranged on the friction layer.

7. The connection structure between the wind turbine gearbox and the main shaft system according to claim 6, characterized in that: The base layer is made of spring steel, the friction layer is a nickel-phosphorus alloy coating, and the friction particles are diamond particles.

8. The connection structure between the wind turbine gearbox and the main shaft system according to claim 7, characterized in that: The thickness of the base layer is 0.5±0.02 mm, the thickness of the friction layer is 20±2 μm, and the diameter of the friction particles is 36±2 μm.

9. The connection structure between the wind turbine gearbox and the main shaft system according to claim 1, characterized in that: The planet carrier is provided with threaded holes whose number and position correspond to the pin holes, a hollow pin is arranged in the pin hole, a stud is arranged in the hollow pin, one end of the stud is threadedly connected with the threaded hole of the planet carrier, and the other end is connected with the main shaft through a nut.

10. The connection structure between the wind turbine gearbox and the main shaft system according to claim 1, characterized in that: The seal also includes a third seal and a fourth seal, and the third seal and the fourth seal are arranged in parallel at the axial connection between the planet carrier and the main shaft.

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