Gear box and wind generating set

Abstract

The utility model relates to a gearbox and a wind generating set, the gearbox comprises a box body, a gear train and an oil inlet ring, the box body is provided with a cavity, the box body is provided with a first oil duct externally connected with a lubricating system, the gear train is arranged in the cavity in a penetrating mode, the gear train comprises a multi-stage planetary gear train, the planetary gear train comprises an oil conveying structure, the oil conveying structure is provided with a second oil duct used for oil inlet, and the oil inlet ring is provided with a second oil duct used for oil inlet. The oil inlet ring is arranged in the cavity and surrounds an oil conveying structure of the planetary gear train, the peripheral face of the oil inlet ring is matched with the inner wall face, facing the cavity, of the box body, the oil inlet ring is provided with an oil groove, and the first oil channel is communicated with the second oil channel through the oil groove. Wherein at least part of the peripheral surface of the oil inlet ring is in interference fit with at least part of the inner wall surface, and the oil inlet ring is fixedly connected with the box body through interference fit. According to the gear box and the wind generating set, the oil inlet ring can be installed in a friction fixing mode, bolts do not need to be arranged, and the reliability of the gear box is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation, in particular to a gear box and a wind turbine generator system. BACKGROUND

[0002] In a wind power gear box, in order to deliver lubricating oil to gears, bearings and splines and other specified positions, holes are drilled on the box body and the gear train and other components inside the box body to form oil channels, but the gear train and the box body are not in contact, so an oil inlet ring must be provided between the box body and the gear train to deliver lubricating oil from the oil channel of the box body to each component of the gear train.

[0003] The current fixing method of the oil inlet ring and the gear box body is mainly to connect the oil inlet ring and the box body of the gear box by bolts, but since the oil inlet ring is in lubricating oil for a long time and the components adjacent to the oil inlet ring are mostly rotating parts, vibration is easy to occur during operation, which may cause the bolts to loosen or fall off and other conditions that seriously affect the safe operation of the gear box. Moreover, when the bolts are installed on the oil inlet ring of the gear box, local deformation of the oil inlet ring may occur due to the installation of the bolts, which further affects the components adjacent to the oil inlet ring. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a gear box and a wind turbine generator system, which can install the oil inlet ring by a friction fixing method, without the need to set bolts, thereby improving the reliability of the gear box.

[0005] In one aspect, the present application provides a gear box, which comprises a box body, a gear train and an oil inlet ring. The box body has a cavity. The box body is provided with a first oil channel connected to a lubricating system. The gear train is arranged in the cavity. The gear train comprises a plurality of planetary gear trains. Each planetary gear train comprises an oil delivery structure. The oil delivery structure is provided with a second oil channel for oil inlet. The oil inlet ring is arranged in the cavity and surrounds the oil delivery structure of the planetary gear train. An outer circumferential surface of the oil inlet ring is matched with an inner wall surface of the box body facing the cavity. The oil inlet ring is provided with an oil groove. The first oil channel is connected to the second oil channel through the oil groove. At least part of the outer circumferential surface of the oil inlet ring is interference-fitted with at least part of the inner wall surface. The oil inlet ring is fixedly connected to the box body by interference fitting.

[0006] According to one aspect of the present application, one of the outer circumferential surface of the oil inlet ring and the inner wall surface is provided with a convex part, and the other is provided with a concave part. The convex part is embedded in the concave part to axially clamp the oil inlet ring in the box body.

[0007] According to one aspect of the present application, the concave part and the convex part both extend along the circumference of the oil inlet ring and are matched in shape. The convex part and the concave part are in the form of a whole ring in the circumferential direction. Alternatively, the number of convex parts is multiple and they are arranged at intervals along the circumference of the oil inlet ring. Each convex part is in the form of an arc segment.

[0008] According to an aspect of the embodiments of the present application, the outer circumferential surface of the oil inlet ring is convex in the radial direction of the oil inlet ring to form a convex portion, and the inner wall surface of the box body is concave to form a concave portion.

[0009] According to an aspect of the embodiments of the present application, the inner wall surface of the box body comprises a first wall surface and a second wall surface arranged in the axial direction, the diameter of the first wall surface is larger than that of the second wall surface, and a stepped surface is formed between the first wall surface and the second wall surface. The convex portion is arranged at one end of the oil inlet ring in the axial direction of the oil inlet ring, the concave portion is arranged on the first wall surface and connected with the stepped surface, the outer circumferential surface of the oil inlet ring is matched with the first wall surface, one side of the oil inlet ring in the axial direction is abutted against the stepped surface, and the convex portion is abutted against the concave portion.

[0010] According to an aspect of the embodiments of the present application, the concave portion has a bottom wall and side walls arranged on both sides of the bottom wall in the axial direction, and the included angle between the bottom wall and the side walls is greater than 90 degrees.

[0011] According to an aspect of the embodiments of the present application, the size of the first wall surface in the axial direction is L1, the size of the concave portion in the axial direction is L2, and the ratio of L2 to L1 is less than or equal to 0.5.

[0012] According to an aspect of the embodiments of the present application, the number of the oil inlet rings is more than two, each oil inlet ring is arranged in the axial direction and matched with the oil supply structure of at least part of the planetary gear train. The gear train comprises an input end and an output end arranged in the axial direction, the input end is used to be connected with the impeller, and the convex portion of each oil inlet ring is arranged at the end of the oil inlet ring facing the input end.

[0013] According to an aspect of the embodiments of the present application, the convex distance of the convex portion in the radial direction of the oil inlet ring is 2mm-3mm.

[0014] On the other hand, according to the embodiments of the present application, a wind turbine generator is provided, which comprises the gear box of the above-mentioned embodiments.

[0015] The gear box provided by the embodiments of the present application has the oil inlet ring arranged between the box body and the oil supply structure of the planetary gear train, the first oil channel of the box body is connected in communication with the second oil channel of the planetary gear train through the oil groove of the oil inlet ring, so as to realize the delivery of the lubricating oil from the external lubricating system to the lubricated area of the planetary gear train. At least part of the outer circumferential surface of the oil inlet ring is in interference fit with at least part of the inner wall surface of the box body, so that the oil inlet ring can be installed in the friction fixing mode to be fixed in the box body, thereby avoiding the setting of the bolts at the connecting part, and further avoiding the situation that the bolts are detached and the oil inlet ring is locally deformed due to the installation of the bolts, and improving the reliability and service life of the gear box. BRIEF DESCRIPTION OF DRAWINGS

[0016] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0017] Figure 1 is a structural schematic diagram of a wind turbine generator set provided by an embodiment of the present application;

[0018] Figure 2 is a structural schematic diagram of a gear box provided by an embodiment of the present application;

[0019] Figure 3 is a structural schematic diagram of a gear box provided by an embodiment of the present application;

[0020] Figure 4 is a partial enlarged view of A in Figure 2

[0021] Figure 5 is a partial enlarged view of B in Figure 2

[0022] wherein:

[0023] 10-gear box; 20-tower; 30-nacelle; 40-generator; 50-hub;

[0024] 1-box; 11-recess; 2-oil delivery structure; 3-oil inlet ring; 31-oil inlet hole; 32-protrusion; S1-first wall surface; S2-second wall surface; S3-step surface;

[0025] X-axial; Z-radial.

[0026] In the drawings, the same components have the same reference numerals, even across different drawings. The accompanying drawings are not drawn to scale. DETAILED DESCRIPTION

[0027] Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely illustrative of the present application and is not intended to limit the present application, as is apparent to one of ordinary skill in the art. In the drawings and description below, well-known structures and techniques have not been shown or described in detail in order not to obscure the application; and, for the sake of clarity, the dimensions of the various structures are exaggerated in the drawings. Furthermore, features, structures or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0028] ​​The positional words appearing in the following description are the directions shown in the drawings, and are not intended to limit the specific structure of the gear box and the wind turbine generator set of the present application. In the description of the present application, it should be further pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] Please refer to Figure 1 , Figure 1 The structural schematic diagram of the wind turbine generator set provided by some embodiments of the present application is shown.

[0030] For some models of wind turbine generator set, such as half direct drive model or double feed model, it includes gear box 10, tower 20, nacelle 30, generator 40 and impeller, the nacelle 30 is arranged at the top end of the tower 20, and the gear box 10 and the generator 40 are arranged in the nacelle 30.

[0031] The impeller includes hub 50 and a plurality of blades connected to the hub 50, and the hub 50 is connected with the input end of the gear box 10. When the wind acts on the blades, it will drive the whole impeller to rotate, and the gear box 10 acts as a transmission system to play the role of power transmission, and is used to increase the low speed of the impeller to the rated speed of the generator 40, so that the generator 40 can generate electricity normally, thereby realizing the conversion of wind energy to electric energy.

[0032] The gear box 10 of the wind turbine generator set in the related art includes a box body and a gear train arranged in the box body, the gear train includes a plurality of planetary gear trains, an oil inlet ring is arranged between the box body and the oil supply structure of the planetary gear train, the oil inlet ring is usually bolted to the box body of the gear box 10 to fix the oil inlet ring, and the oil inlet ring is used to deliver lubricating oil from the box body to the lubricating area of the planetary gear train. However, the bolted fixing method is not only easy to loosen or fall off during use, but also has the defect that the local deformation of the oil inlet ring is caused during installation.

[0033] Therefore, in order to overcome the above defects, the present application further provides a new type of gear box 10, which can be used in the wind turbine generator set of the above embodiments, or can be produced or sold as an independent component.

[0034] Please refer to Figures 1 to 5 , Figure 2 The structural schematic diagram of the gear box 10 of some embodiments of the present application is shown, Figure 3 The structural schematic diagram of the oil inlet ring of a gear box provided by the embodiments of the present application is shown, Figure 4 The structural schematic diagram of the oil inlet ring of a gear box provided by the embodiments of the present application is shown, Figure 2A close-up view of the middle A, Figure 5 It is shown Figure 2 A close-up view of the middle B.

[0035] The embodiment of the present application provides a gear box 10, which comprises a box body 1, a gear train and an oil inlet ring 3, the box body 1 has a cavity, the box body 1 is provided with a first oil channel of an external lubrication system, the gear train is arranged in the cavity, the gear train comprises a plurality of planetary gear trains, the planetary gear train is provided with an oil supply structure 2, the oil supply structure 2 is provided with a second oil channel for oil inlet, the oil inlet ring 3 is arranged in the cavity and surrounds the oil supply structure 2 of the planetary gear train, the outer circumferential surface of the oil inlet ring 3 is matched with the inner wall surface of the box body 1 towards the cavity, the oil inlet ring 3 is provided with an oil groove, and the first oil channel is communicated with the second oil channel through the oil groove. Wherein, at least part of the outer circumferential surface of the oil inlet ring 3 is in interference fit with at least part of the inner wall surface, and the oil inlet ring 3 is fixedly connected with the box body 1 through the interference fit.

[0036] The gear box 10 provided by the embodiment of the present application is provided with the oil inlet ring 3 between the box body 1 and the oil supply structure 2 of the planetary gear train, the first oil channel of the box body 1 is communicated with the second oil channel of the oil supply structure 2 through the oil groove of the oil inlet ring 3, so that the delivery of lubricating oil from the external lubrication system to the lubricated area of the planetary gear train is realized. At least part of the outer circumferential surface of the oil inlet ring 3 is in interference fit with at least part of the inner wall surface of the box body 1, so that the oil inlet ring 3 can be installed in the friction fixing mode to be fixed in the box body 1, avoiding the setting of bolts at the connecting part, and further avoiding the situation that the bolts fall off during use and the local deformation of the oil inlet ring 3 caused by the installation of the bolts, thereby improving the reliability and service life of the gear box 10.

[0037] It can be understood that the interference fit means that there is a certain interference amount between the oil inlet ring 3 and the box body 1, so that the oil inlet ring 3 can be closely combined into the box body 1 after assembly. Due to the interference fit between the outer circumferential surface of the oil inlet ring 3 and the inner wall surface of the box body 1, the oil inlet ring 3 will be extruded along the radial direction Z by the inner wall surface of the box body 1, and the extrusion force can limit the freedom degrees of the oil inlet ring 3 in the radial direction Z and the circumferential direction. In the axial direction X, a special interference fit mode can be adopted, for example, at least part of the outer circumferential surface of the oil inlet ring 3 and at least part of the inner wall surface of the box body 1 are in concave-convex interference fit, flat key interference fit or taper interference fit (the inner wall surface of the box body 1 and the outer circumferential surface of the oil inlet ring 3 are both provided with taper surfaces matched with each other), so as to limit the movement freedom degree of the oil inlet ring 3 along the axial direction X, so that the oil inlet ring 3 can be fixedly connected with the box body 1 without setting bolts, thereby improving the reliability of the gear box 10.

[0038] The gear train includes a plurality of planetary gear trains, and the rotation speed of the impeller reaches the required rotation speed of the generator 40 through the transmission of the plurality of planetary gear trains. For the gear box 10, the parts that need to be lubricated mainly include the bearings of the plurality of planetary gear trains. The box body 1 can be correspondingly provided with a plurality of first oil channels, and the oil supply structure 2 corresponding to the planetary gear train can be provided with a second oil channel for oil inlet. The gear box 10 includes a plurality of oil inlet rings 3, and the oil inlet rings 3 are respectively arranged between the box body 1 and the oil supply structure 2 of at least part of the planetary gear train, so that the plurality of first oil channels in the box body 1 are respectively communicated with the second oil channel through each oil inlet ring 3, and the lubricating oil is respectively delivered to the bearings of the plurality of planetary gear trains through the second oil channel, so as to realize the lubrication of the bearings.

[0039] As an optional implementation, Figure 3 It is shown Figure 2 The structure diagram of the oil inlet ring at A in the figure, wherein the lubrication of the bearings of the primary planetary gear train through the oil inlet at the rear end of the gear box is taken as an example. A is the oil supply structure 2 corresponding to the primary planetary gear train for oil inlet, and the oil supply structure 2 can be specifically provided as a double-layer threading pipe, that is, the oil inlet ring 3 can be arranged between the box body 1 and the double-layer threading pipe, and the first oil channel of the box body 1 enters the rear end of the double-layer threading pipe through the oil inlet ring, so as to be delivered to the primary planetary gear train through the second oil channel of the double-layer threading pipe, thereby realizing the oil supply of the bearings in the primary planetary gear train. B is the oil supply structure 2 corresponding to the secondary planetary gear train for oil inlet, and the oil supply structure 2 of the secondary planetary gear train can be specifically provided as the planet carrier of the secondary planetary gear train, that is, the oil inlet ring 3 can also be arranged between the box body 1 and the planet carrier of the secondary planetary gear train, for example, can be arranged between the box body 1 and the input end of the planet carrier, and the first oil channel of the box body 1 enters the second oil channel of the planet carrier of the secondary planetary gear train through the oil inlet ring, thereby realizing the oil supply of the bearings in the secondary planetary gear train.

[0040] It can be understood that at least part of the planetary gear train can be provided with the oil inlet ring 3, and the oil supply structure 2 of the planetary gear train can be adjusted according to the specific structure of the gear box, so as to meet the lubrication requirements of the bearings of the plurality of planetary gear trains.

[0041] Optionally, when the gear box 10 includes a plurality of oil inlet rings 3, each oil inlet ring 3 can be fixedly connected with the box body 1 through interference fit, so as to avoid the situation that the oil inlet ring 3 is locally deformed due to the falling of the bolts and the installation of the bolts during the operation of the gear box 10.

[0042] When the oil inlet ring 3 is arranged between the oil supply structure 2 of the planetary gear train and the box 1, the outer circumferential surface of the oil inlet ring 3 is in interference fit with the inner wall surface of the box 1, and the inner circumferential surface of the oil inlet ring 3 is in rotational fit with the outer circumferential surface of the oil supply structure 2 of the planetary gear train. For the oil inlet ring 3, the oil inlet hole 31 is arranged to penetrate in the radial direction Z and forms an oil groove, so that the lubricating oil can be delivered from the first oil passage to the second oil passage through the oil groove, thereby achieving lubrication of the bearing.

[0043] Optionally, the inner wall surface of the box 1 facing the cavity and / or the surface of the oil supply structure 2 for cooperating with the oil inlet ring 3 can be provided with an annular groove, the number of oil inlet holes 31 is two or more, and the two or more oil inlet holes 31 are arranged in the circumferential direction of the oil inlet ring 3, and the annular groove corresponds to the two or more oil inlet holes 31, so that the first oil passage and / or the second oil passage can cooperate with the plurality of oil inlet holes 31 through the annular groove. On the one hand, it is more convenient to assemble, without the need to align the oil inlet hole 31 with the first oil passage, improving the assembly efficiency, and on the other hand, it is also beneficial to the shunt delivery of the lubricating oil through the plurality of oil inlet holes 31, making the flow of the lubricating oil more smooth.

[0044] Optionally, the inner circumferential surface of the oil inlet hole 31 and the cooperating surface of the oil supply structure 2 are provided with a sealing structure arranged on both sides of the oil inlet hole 31 in the axial direction X for oil sealing, to ensure that the lubricating oil can be delivered into the second oil passage through the oil inlet hole 31, and to improve the reliability of the lubricating oil delivery.

[0045] Optionally, the oil inlet ring 3 can be a copper ring, which is more wear-resistant.

[0046] Please refer to Figure 4 and Figure 5 , and the following will be described by taking the concave-convex interference fit between at least part of the outer circumferential surface of the oil inlet ring 3 and at least part of the inner wall surface of the box 1 as an example.

[0047] In some optional embodiments, one of the outer circumferential surface of the oil inlet ring 3 and the inner wall surface is provided with a convex portion 32, and the other is provided with a concave portion 11, and the convex portion 32 is embedded in the concave portion 11 to clamp the oil inlet ring 3 in the box 1 in the axial direction X.

[0048] That is, the convex portion 32 can be arranged on a local area of the outer circumferential surface of the oil inlet ring 3, and the concave portion 11 can be arranged on a local area of the inner wall surface of the box 1, and the convex portion 32 of the outer circumferential surface of the oil inlet ring 3 is embedded in the concave portion 11 of the inner wall surface of the box 1 to limit the movement freedom of the oil inlet ring 3 relative to the box 1 in the axial direction X. Alternatively, the concave portion 11 can be arranged on a local area of the outer circumferential surface of the oil inlet ring 3, and the convex portion 32 can be arranged on a local area of the inner wall surface of the box 1, and the convex portion 32 of the inner wall surface of the box 1 is embedded in the concave portion 11 of the outer circumferential surface of the oil inlet ring 3 to limit the movement freedom of the oil inlet ring 3 relative to the box 1 in the axial direction X.

[0049] By adopting the concave-convex interference fit mode, the movement freedom degree of the oil inlet ring 3 relative to the case 1 along the axial direction X can be limited by the abutting of the convex portion 32 and the concave portion 11, and at the same time, the friction force can be generated by the extrusion of the side surfaces of the convex portion 32 and the concave portion 11 due to the side surface interference fit of the convex portion 32 and the concave portion 11, which can further limit the rotation freedom degree of the oil inlet ring 3 along the circumferential direction, so that the oil inlet ring 3 can be more reliably clamped in the case 1.

[0050] It can be understood that the oil inlet ring 3 can be clamped in the case 1 along the axial direction X by adopting a heating assembly or a cooling assembly. By adopting the heating assembly or the cooling assembly, a larger interference amount can be provided between the oil inlet ring 3 and the case 1, so as to improve the tightness of the connection between the oil inlet ring 3 and the case 1. At the same time, the risk of damage to the oil inlet ring 3 and the case 1 during assembly can be reduced, and the reliability of the gear box 10 can be improved.

[0051] In some optional embodiments, the concave portion 11 and the convex portion 32 both extend along the circumferential direction of the oil inlet ring 3 and are matched in shape, the convex portion 32 and the concave portion 11 are in the form of a whole ring in the circumferential direction, or the number of the convex portion 32 is multiple and is arranged at intervals along the circumferential direction of the oil inlet ring 3, and each convex portion 32 is in the form of an arc segment.

[0052] That is, the convex portion 32 can be arranged in the form of a ring and form a ring-shaped boss on the outer circumferential surface of the oil inlet ring 3 or the inner wall surface of the case 1, or the number of the convex portion 32 can also be multiple and arranged at intervals along the circumferential direction of the oil inlet ring 3. When the number of the convex portion 32 is multiple and arranged at intervals along the circumferential direction of the oil inlet ring 3, the concave portion 11 can be in the form of a whole ring in the circumferential direction, and the number of the concave portion 11 can also be multiple, and each convex portion 32 corresponds to one of the concave portions 11 and is embedded in the concave portion 11.

[0053] It can be understood that by arranging the convex portion 32 and the concave portion 11 in the form of a ring, the assembly of the oil inlet ring 3 can be more convenient, and by arranging the number of the convex portion 32 to be multiple and arranged at intervals along the circumferential direction of the oil inlet ring 3, the rotation freedom degree of the oil inlet ring 3 along the circumferential direction can be more reliably limited by the cooperation of the convex portion 32 and the concave portion 11. That is, the specific arrangement form of the convex portion 32 and the concave portion 11 can be adjusted according to the structure of the oil inlet ring 3.

[0054] Please refer to Figure 4 and Figure 5 In some optional embodiments, in the radial direction Z of the oil inlet ring 3, the outer circumferential surface of the oil inlet ring 3 protrudes in the direction away from the oil inlet structure 2 to form the convex portion 32, and the inner wall surface of the case 1 is recessed to be provided with the concave portion 11.

[0055] Compared with arranging the convex portion 32 on the inner wall surface of the case 1, by arranging the convex portion 32 on the outer circumferential surface of the oil inlet ring 3 and arranging the concave portion 11 on the inner wall surface of the case 1, the manufacturing difficulty can be reduced.

[0056] Optionally, the convex part 32 can be integrally arranged on the oil inlet ring 3 to improve the structural strength of the oil inlet ring 3.

[0057] In some optional embodiments, the inner wall surface of the box 1 comprises a first wall surface S1 and a second wall surface S2 arranged along the axial direction X, the diameter of the first wall surface S1 is greater than that of the second wall surface S2, and a stepped surface S3 is formed between the first wall surface S1 and the second wall surface S2. The convex part 32 is arranged at one end of the oil inlet ring 3 along the axial direction X, the concave part 11 is arranged on the first wall surface S1 and is connected with the stepped surface S3, the outer circumferential surface of the oil inlet ring 3 is matched with the first wall surface S1, one side of the oil inlet ring 3 along the axial direction X abuts against the stepped surface S3, and the convex part 32 abuts against the concave part 11.

[0058] When the convex part 32 is arranged on the inner wall surface of the box 1, the convex part 32 can be arranged close to one end of the oil inlet ring 3 along the axial direction X, and the inner wall surface of the box 1 can also be arranged as a stepped structure comprising a first wall surface S1, a second wall surface S2 arranged along the axial direction X, and a stepped surface S3 connected between the first wall surface S1 and the second wall surface S2. When the oil inlet ring 3 is clamped in the box 1, one side of the oil inlet ring 3 along the axial direction X can abut against the stepped surface S3, and the other end can abut against the concave part 11 through the convex part 32, so as to improve the clamping effect of the oil inlet ring 3.

[0059] When the oil inlet ring 3 is installed, the diameter of the oil inlet ring 3 can be reduced by freezing, and the diameter of the box 1 can be increased by heating, and then the oil inlet ring 3 is assembled in the box 1. By adopting the assembly mode of cooling the oil inlet ring 3 and heating the box 1, when the oil inlet ring 3 and the box 1 return to normal temperature, the oil inlet ring 3 can form a concave-convex interference fit structure with the box 1, and the oil inlet ring 3 and the box 1 can form a large interference amount, so that the oil inlet ring 3 can be reliably fixed in the box 1, thereby reducing the risk of movement or falling of the oil inlet ring 3 during the operation of the gear box 10, and improving the reliability of the gear box 10 during use.

[0060] Please refer to Figures 1 to 5 , as an optional embodiment, when the number of oil inlet rings 3 is two or more, each oil inlet ring 3 is arranged along the axial direction X and is matched with the oil conveying structure 2 of at least part of the planetary gear train, the gear train comprises an input end and an output end arranged along the axial direction X, the input end is used to be connected with the impeller, and the convex part 32 of each oil inlet ring 3 is arranged at the end of the oil inlet ring 3 towards the input end.

[0061] The input end of the gear train refers to the end connected to the wheel hub 50, and the output end of the gear train refers to the end connected to the generator 40. Since the oil inlet ring 3 is assembled in the box 1 from the output end of the gear train towards the input end in the actual assembly process, the protruding part 32 of each oil inlet ring 3 is arranged at the end of the oil inlet ring 3 towards the input end, which can facilitate the assembly of the oil inlet ring 3 and make the connection more reliable.

[0062] In some optional embodiments, the recess 11 has a bottom wall and side walls distributed on both sides of the bottom wall in the axial direction X, and the included angle between the bottom wall and the side walls is greater than 90 degrees.

[0063] That is, the side walls of the recess 11 are arranged obliquely, and the protruding part 32 and the recess 11 abut against each other through the inclined surface. Compared with the perpendicular arrangement of the bottom wall and the side walls of the recess 11, the oblique arrangement of the side walls of the recess 11 can increase the contact area of the protruding part 32 and the recess 11, thereby increasing the friction force between the oil inlet ring 3 and the box 1 in the circumferential direction after the protruding part 32 and the recess 11 abut against each other, further limiting the rotational freedom of the oil inlet ring 3 in the circumferential direction, and improving the clamping effect on the oil inlet ring 3.

[0064] In some optional embodiments, the size of the first wall surface S1 in the axial direction X is L1, the size of the recess 11 in the axial direction X is L2, and the ratio of L2 to L1 is less than or equal to 0.5.

[0065] By setting the ratio of the size L2 of the recess 11 in the axial direction X to the size L1 of the first wall surface S1 in the axial direction X to be less than or equal to 0.5, the deformation of the oil inlet ring 3 and the box 1 during use can be reduced while reliably clamping the oil inlet ring 3 and reducing the risk of the oil inlet ring 3 falling off during use of the gear box 10, thereby improving the reliability of the gear box 10.

[0066] Alternatively, the ratio of the size L2 of the recess 11 in the axial direction X to the size L1 of the first wall surface S1 in the axial direction X can be set to 0.5 to simplify the structure.

[0067] Alternatively, the protruding distance of the protruding part 32 in the radial direction Z of the oil inlet ring 3 is 2mm-3mm, that is, the protruding distance of the protruding part 32 in the radial direction Z is not too large, so as to reliably clamp the oil inlet ring 3, reduce the risk of the oil inlet ring 3 falling off during use of the gear box 10, reduce the deformation of the oil inlet ring 3 and the box 1 during use, and improve the reliability of the gear box 10.

[0068] Similarly to the protruding part 32, the recess 11 has a recessed distance in the radial direction Z of the oil inlet ring 3 that is greater than or equal to the protruding distance of the protruding part 32 in the radial direction Z of the oil inlet ring 3, so as to facilitate the assembly of the protruding part 32 and the recess 11.

[0069] Therefore, the gear box 10 in the embodiments of the present application can fix the oil inlet ring 3 in the box body 1 through the friction fixing mode, so that the oil inlet ring 3 is clamped in the box body 1, the bolts are not arranged at the connecting position, and the situation that the bolts are detached and the oil inlet ring 3 is locally deformed due to the installation of the bolts is avoided, and the reliability and service life of the gear box 10 are improved.

[0070] The wind turbine provided in the embodiments of the present application has the advantages of high reliability, long service life and the like, and is easy to popularize and apply.

[0071] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application and equivalents thereof without departing from the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A gear box, characterized in that, The application relates to a gearbox comprising: a housing (1) having a cavity, the housing (1) being provided with a first oil passage of an external lubrication system; a gear train arranged in the cavity, the gear train comprising a multi-stage planetary gear train, the planetary gear train comprising an oil supply structure (2) provided with a second oil passage for oil inlet; an oil inlet ring (3) arranged in the cavity and surrounding the oil supply structure (2) of the planetary gear train, an outer circumferential surface of the oil inlet ring (3) being matched with an inner wall surface of the housing (1) facing the cavity, the oil inlet ring (3) being provided with an oil groove, the first oil passage being communicated with the second oil passage through the oil groove; wherein at least part of the outer circumferential surface of the oil inlet ring (3) is interference-fitted with at least part of the inner wall surface, and the oil inlet ring (3) is fixedly connected with the housing (1) through the interference fit.

2. The gear case of claim 1, wherein, One of the outer circumferential surface of the oil inlet ring (3) and the inner wall surface is provided with a convex part (32), and the other is provided with a concave part (11), the convex part (32) is embedded in the concave part (11) to clamp the oil inlet ring (3) in the housing (1) along the axial direction (X).

3. The gear case of claim 2, wherein, The concave part (11) and the convex part (32) both extend along the circumferential direction of the oil inlet ring (3) and are matched in shape. The convex part (32) and the concave part (11) are annular in the circumferential direction, or the number of the convex parts (32) is multiple and is arranged in the circumferential direction of the oil inlet ring (3) at intervals, and each of the convex parts (32) is arc-shaped.

4. A gearbox according to claim 2 or 3, characterised in that, In the radial direction (Z) of the oil inlet ring (3), the outer circumferential surface of the oil inlet ring (3) is convex in the direction away from the oil supply structure (2) to form the convex part (32), and the inner wall surface of the housing (1) facing the oil inlet ring (3) is concave and provided with the concave part (11).

5. The gear box (10) according to claim 4, characterized in that The inner wall surface of the housing (1) comprises a first wall surface (S1) and a second wall surface (S2) arranged along the axial direction (X), the diameter of the first wall surface is larger than that of the second wall surface, and a stepped surface (S3) is formed between the first wall surface and the second wall surface; The convex part (32) is arranged at one end of the oil inlet ring (3) along the axial direction (X), the concave part (11) is arranged on the first wall surface (S1) and is connected with the stepped surface (S3), the outer circumferential surface of the oil inlet ring (3) is matched with the first wall surface (S1), one side of the oil inlet ring (3) along the axial direction (X) abuts against the stepped surface (S3), and the convex part abuts against the concave part (11).

6. The gear case of claim 5, wherein, The concave part (11) has a bottom wall and side walls distributed on both sides of the bottom wall along the axial direction (X), and the included angle between the bottom wall and the side walls is greater than 90 degrees.

7. The gear case of claim 5, wherein, The size of the first wall surface (S1) along the axial direction (X) is L1, the size of the concave part (11) along the axial direction (X) is L2, and the ratio of L2 to L1 is less than or equal to 0.

5.

8. The gear case of claim 5, wherein, The number of the oil inlet rings (3) is more than two, each of the oil inlet rings (3) is arranged at intervals along the axial direction (X) and is matched with at least part of the oil supply structure (2) of the planetary gear train. Said gear train comprises an input end and an output end arranged along an axial direction (X), said input end being intended to be connected to an impeller, said protrusion (32) of each of said oil rings (3) being arranged at an end of said oil ring (3) facing said input end.

9. A gearbox according to claim 2 or 3, characterised in that, Said protrusion (32) has a radial (Z) protrusion distance of 2 mm to 3 mm along said oil ring (3).

10. A wind power unit, characterized in that Gearbox (10) comprising a gear train according to any one of claims 1 to 9.

Images