Transmission chain structure and wind generating set

Abstract

The invention provides a transmission chain structure and a wind generating set, and relates to the technical field of transmission. The transmission chain structure comprises a gear box and a transmission chain, wherein the gear box is provided with a connecting end; the transmission assembly comprises a main shaft, a first bearing and a second bearing, one end of the main shaft is connected with the connecting end, the main shaft is sleeved with the first bearing and the second bearing in the axial direction of the main shaft in a spaced mode, the second bearing is connected with the gearbox, and the second bearing and the first bearing are both used for being fixed to a part to be installed. The second bearing and the gear box are integrated, so that the overall structure is compact, elastic support is omitted, the structure is changed into an outer-rigid and inner-rigid structure, the weight of the overall structure is reduced, the first bearing and the second bearing are separately arranged on the main shaft in a sleeving mode at intervals, the casting size of a single bearing is reduced, the risk of casting defects is reduced, and the main shaft and the bearings are evenly stressed; the transmission is stable.

Description

Technical Field

[0001] The present application relates to the field of transmission technology, and in particular to a transmission chain structure and a wind turbine generator set. Background Art

[0002] The wind turbine generator set includes a wind wheel, a transmission chain structure and a generator, etc., which are arranged in sequence. The transmission chain structure includes a main shaft, a main shaft bearing, a bearing seat and a gear box. The main shaft bearing is sleeved on the main shaft. One end of the main shaft is connected to the wind wheel, and the other end is connected to the rotating shaft of the gear box. The main shaft bearing is arranged on the bearing seat. The gear box and the bearing seat are connected to the frame of the wind turbine generator set. When working, the wind drives the wind wheel to rotate, driving the main shaft to rotate, and the gear box changes speed, and the kinetic energy is converted into electrical energy through the generator and output.

[0003] In the prior art, for the structure of a large megawatt transmission chain, a large torque and power are required, and the main shaft bearing adopts a front-end integrated bearing seat one-piece structure, that is, a large bearing seat is arranged at one end of the main shaft facing the wind wheel, and a large bearing is arranged on the bearing seat.

[0004] However, the above-mentioned bearing seat is relatively large in size. Due to the limitations of casting production capacity and casting defects, there are slight casting defects or machining size deviations, which may easily lead to uneven force on the main shaft and the bearing, affecting the transmission process. Summary of the invention

[0005] The present application provides a transmission chain structure and a wind turbine generator set to solve the problem that the existing bearing seat is large in size, has slight casting defects or machining size deviations due to the limitations of casting production capacity and casting defects, and is prone to uneven force on the main shaft and bearings, thus affecting the transmission process.

[0006] In order to achieve the above purpose, the technical solution of this application is as follows:

[0007] On the one hand, the present application provides a transmission chain structure, comprising:

[0008] a gear box, the gear box having a connection end;

[0009] The transmission assembly includes a main shaft, a first bearing and a second bearing. One end of the main shaft is connected to the connecting end. The first bearing and the second bearing are sleeved on the main shaft along the axial direction of the main shaft. The second bearing is connected to the gear box. The second bearing and the first bearing are both used to be fixed on the part to be installed.

[0010] In a possible implementation, in the transmission chain structure in the embodiment of the present application, the end of the gear box facing the second bearing has a first connecting portion, and the second bearing includes a bearing seat, and the bearing seat is detachably connected to the first connecting portion.

[0011] In one possible implementation, in the transmission chain structure in the embodiment of the present application, the second bearing also includes a second bearing body, a bearing seat having an installation cavity, the second bearing body is arranged in the bearing seat, the second bearing body is connected to the main shaft, the gear box has a planetary carrier, and the planetary carrier is connected to the main shaft through the second bearing body.

[0012] In a possible implementation, the transmission chain structure in the embodiment of the present application further includes an oil throwing assembly, which is arranged on the second bearing. The oil throwing assembly includes an oil throwing ring and an oil blocking groove. The oil throwing ring is arranged toward the gear box, and the oil blocking groove is arranged relative to the oil throwing ring.

[0013] In one possible implementation, in the transmission chain structure in the embodiment of the present application, the second bearing includes a bearing pressure plate, and the bearing pressure plate has at least two oil-blocking protrusions on the side facing the gear box, and the oil-blocking protrusions are arranged at intervals, and an oil-blocking groove is formed between two adjacent oil-blocking protrusions.

[0014] In a possible implementation, the transmission chain structure in the embodiment of the present application further includes a seal, and the seal is arranged at one end of the main shaft facing the gear box.

[0015] In a possible implementation, the transmission chain structure in the embodiment of the present application, the gearbox also includes a sun gear, the sun gear has an internal spline, the planet carrier has an external spline, the internal spline is connected to the external spline, and the planet carrier is connected to the main shaft.

[0016] In a possible implementation, the transmission chain structure in the embodiment of the present application, the gearbox also includes a planetary gear and a fixing part, the fixing part includes a pin and a sleeve, the sleeve is sleeved on the pin, a gap is provided between the sleeve and the pin, the planetary gear sleeve is arranged on the sleeve, the pin is arranged on the planetary carrier, and the planetary carrier is a single belly plate structure.

[0017] In a possible implementation, in the transmission chain structure in the embodiment of the present application, the first bearing is a grease-lubricated bearing, and the second bearing is an oil-lubricated bearing.

[0018] On the other hand, the present application provides a wind turbine generator set, comprising a main body and a transmission chain structure in any one of the above embodiments arranged on the main body.

[0019] The present application provides a transmission chain structure and a wind turbine generator set, wherein the transmission chain structure is provided with a gearbox, the gearbox having a connection end; a transmission assembly, the transmission assembly including a main shaft, a first bearing and a second bearing, one end of the main shaft is connected to the connection end, the first bearing and the second bearing are sleeved on the main shaft along the axial direction of the main shaft, the second bearing is connected to the gearbox, and the second bearing and the first bearing are both used to be fixed on the part to be installed. By integrating the second bearing with the gearbox, the overall structure is made compact, the elastic support is eliminated, and a structure with rigid outer and rigid inner is changed to reduce the weight of the overall structure, the first bearing and the second bearing are sleeved on the main shaft separately and spaced apart, the casting size of a single bearing is reduced, the risk of casting defects is reduced, the main shaft and the bearing are evenly stressed, and the transmission is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 A schematic diagram of the transmission chain structure provided in the embodiment of the present application Figure 1 ;

[0022] Figure 2 A schematic diagram of the transmission chain structure provided in the embodiment of the present application Figure 2 ;

[0023] Figure 3 A schematic diagram of the structure of an oil-slinging assembly in a transmission chain structure provided in an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of an oil-slinging assembly and a seal in a transmission chain structure provided in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of the structure of a seal in a transmission chain structure provided in an embodiment of the present application;

[0026] Figure 6 A schematic diagram of the structure of the sun gear and the planet carrier in the transmission chain structure provided in an embodiment of the present application;

[0027] Figure 7 A schematic diagram of the structure of a fixing member and a planet carrier in a transmission chain structure provided in an embodiment of the present application;

[0028] Figure 8 A schematic diagram of the structure of a fixing member in a transmission chain structure provided in an embodiment of the present application.

[0029] Description of reference numerals:

[0030] 100-Gear box;

[0031] 110-planet carrier; 111-first connecting portion;

[0032] 120-sun gear;

[0033] 130-Planetary gear;

[0034] 140-fixing member; 141-pin shaft; 142-sleeve;

[0035] 200-transmission assembly;

[0036] 210-spindle;

[0037] 220-first bearing;

[0038] 230 - second bearing; 231 - bearing pressure plate;

[0039] 300-Oil throwing assembly;

[0040] 310- oil slinger;

[0041] 320-oil-blocking groove; 321-oil-blocking convex portion;

[0042] 400 - Seals.

[0043] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0044] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0045] It should be noted that in the description of the embodiments of the present application, terms such as "upper", "lower", "inside" and "outside" indicating orientation or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description, and do not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0046] In addition, it should be noted that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like 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, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] The wind turbine generator set includes a wind wheel, a transmission chain structure and a generator, etc., which are arranged in sequence. The transmission chain structure includes a main shaft, a main shaft bearing, a bearing seat and a gear box. The main shaft bearing is sleeved on the main shaft. One end of the main shaft is connected to the wind wheel, and the other end is connected to the rotating shaft of the gear box. The main shaft bearing is arranged on the bearing seat. The gear box and the bearing seat are connected to the frame of the wind turbine generator set. When working, the wind drives the wind wheel to rotate, driving the main shaft to rotate, and the gear box changes speed, and the kinetic energy is converted into electrical energy through the generator and output.

[0049] In the prior art, for the structure of a large megawatt transmission chain, which requires a large torque and power, the main shaft bearing adopts a front-end integrated bearing seat one-piece structure, that is, a large bearing seat is set at the end of the main shaft facing the wind wheel, and a large bearing is set on the bearing seat. However, the above-mentioned bearing seat is relatively large in size. Due to the limitations of casting production capacity and casting defects, there are slight casting defects or machining size deviations, which may easily cause uneven force on the main shaft and bearings, affecting the transmission process. Because the bearing seat is relatively large, it is often encountered that slight casting defects or machining size deviations have to be compromised.

[0050] In view of this, the present application provides a transmission chain structure and a wind turbine generator set, the transmission chain structure includes: a gearbox, the gearbox has a connecting end; a transmission assembly, the transmission assembly includes a main shaft, a first bearing and a second bearing, one end of the main shaft is connected to the connecting end, the first bearing and the second bearing are sleeved on the main shaft along the axial direction of the main shaft, the second bearing is connected to the gearbox, and the second bearing and the first bearing are both used to be fixed on the part to be installed. By integrating the second bearing with the gearbox, the overall structure is made compact, the elastic support is eliminated, and a structure with rigid outside and rigid inside is changed to reduce the weight of the overall structure. The first bearing and the second bearing are sleeved on the main shaft separately and spaced apart, which reduces the casting size of a single bearing, reduces the risk of casting defects, and makes the main shaft and the bearings evenly stressed and the transmission stable.

[0051] Combine the following Figures 1 to 8 The present application is described in detail with reference to the accompanying drawings and specific embodiments.

[0052] On the one hand, the present application provides a transmission chain structure, including: a gearbox 100, the gearbox 100 has a connecting end; a transmission assembly 200, the transmission assembly 200 includes a main shaft 210, a first bearing 220 and a second bearing 230, one end of the main shaft 210 is connected to the connecting end, the first bearing 220 and the second bearing 230 are arranged on the main shaft 210 along the axial direction of the main shaft 210, the second bearing 230 is connected to the gearbox 100, and the second bearing 230 and the first bearing 220 are both used to be fixed on the part to be installed.

[0053] The gearbox 100 includes a housing and a planetary gear train, wherein the housing has a receiving cavity, the planetary gear train is arranged in the receiving cavity, one end of the planetary gear train has a connecting end, the connecting end is used to connect to the main shaft 210, and the other end of the planetary gear train is connected to a generator to convert kinetic energy into electrical energy. The generator may be a double-fed wind turbine generator.

[0054] The planetary gear train may be a single-stage planetary gear train or a multi-stage planetary gear train, which is not limited in the embodiments of the present application.

[0055] Exemplarily, the planetary gear train is a first-stage planetary gear train including a first-stage planetary gear, the first-stage planetary gear including a sun gear, multiple planetary gears and a ring gear, the sun gear has an outer gear and an inner gear, each planetary gear is arranged around the circumference of the sun gear, each planetary gear is meshed with the sun gear, the inner circumference of the ring gear is provided with teeth, and the ring gear is meshed with the planetary gears.

[0056] The present application does not limit the structures of the first bearing 220 and the second bearing 230. For example, the first bearing 220 includes a first bearing body and a bearing seat, and the second bearing 230 includes a second bearing body and a bearing seat. The bearing seat of the first bearing 220 is arranged at one end of the main shaft 210 facing the wind wheel and is connected to the part to be installed. The part to be installed can be a frame of a wind turbine generator set.

[0057] The bearing seat of the second bearing 230 is arranged at one end of the main shaft 210 facing the gear box 100, and is detachably connected to the gear box 100. For example, the bearing seat of the second bearing 230 is connected to the torque arm of the gear box 100. It should be noted that the gear box 100 can also remove the torque arm and directly connect to the bearing seat of the second bearing 230.

[0058] It should be noted that the structures of the first bearing body and the second bearing body can be the same or different, and the embodiments of the present application do not limit this. For example, the second bearing body includes an inner ring, a rolling element, and an outer ring that are sleeved in sequence, the rolling element is located between the inner ring and the outer ring, the inner ring can rotate around its axis, and the outer ring is fixed on the bearing seat of the second bearing. In addition, the second bearing body can be a ball bearing, a roller bearing, a plane bearing, a fluid bearing, a magnetic bearing, a spring bearing, etc., and the embodiments of the present application do not limit this, and can be set according to actual needs.

[0059] One end of the main shaft 210 is connected to the connecting end, the first bearing 220 and the second bearing 230 are sleeved on the main shaft 210 at intervals along the axial direction of the main shaft 210 , and the second bearing 230 is connected to the gear box 100 .

[0060] The transmission chain structure in the embodiment of the present application integrates the second bearing 230 with the gear box 100, making the overall structure compact, eliminating the elastic support and replacing it with a rigid outer and inner structure to reduce the weight of the overall structure. The first bearing 220 and the second bearing 230 are separately and spaced apart and sleeved on the main shaft 210, reducing the casting size of a single bearing and the risk of casting defects, so that the main shaft 210 and the bearings are evenly stressed and the transmission is stable.

[0061] In a possible implementation, in the transmission chain structure in the embodiment of the present application, the gear box 100 has a first connection portion 111 at one end facing the second bearing 230 , and the second bearing 230 includes a bearing seat, and the bearing seat is detachably connected to the first connection portion 111 .

[0062] Exemplarily, the first connection part 111 may be a torque arm, and the second bearing 230 includes a bearing seat, a bearing seat and a torque arm. It also includes a second connection part, the first connection part 111 has a first connection hole, the bearing seat has a second connection hole, and the second connection part is connected to the first connection part 111 and the bearing seat through the first connection hole and the second connection hole, respectively. The embodiment of the present application does not limit the structure of the second connection part. Exemplarily, the second connection part may be a bolt, a screw or a stud.

[0063] The bearing seat is detachably connected to the first connecting portion 111, so that different gear boxes can be adapted according to requirements, and disassembly, assembly and transportation are facilitated.

[0064] In one possible implementation, in the transmission chain structure in the embodiment of the present application, the second bearing 230 also includes a second bearing body, a bearing seat having an installation cavity, the second bearing body is arranged in the bearing seat, the second bearing body is connected to the main shaft 210, and the gear box 100 has a planetary carrier 110, and the planetary carrier 110 is connected to the main shaft 210 through the second bearing body.

[0065] The gearbox 100 has a planet carrier 110, one end of which is a connection end for connecting with the main shaft 210. The second bearing body is sleeved on the main shaft 210. The planet carrier 110 can be set in a bearing seat. The planet carrier 110 can be a primary rotating frame, and the bearing of the original primary rotating frame is eliminated through the support of the second bearing 230, so that the planetary stage side clearance is used to appropriately maintain some flexibility and save the bearing cost.

[0066] It can be understood that after the second bearing 230 is rigidly connected to the frame, the over-constraint structure is no longer used, the elastic support is cancelled, and it is replaced by an outer-rigid and inner-rigid structure. The main shaft 210 is consistent with the axis of the first-stage rotating frame, and the bearing seat of the second bearing 230 is consistent with the axis of the ring gear of the planetary gear train, reducing the torsional swing of the gear box.

[0067] The second bearing 230 includes a bearing seat and a second bearing body. The second bearing body is arranged on the bearing seat. The second bearing body is sleeved on the main shaft 210. The second bearing body pressure plate is connected to the bearing seat. The bearing seat is connected to the gear box 100.

[0068] In one possible implementation, the transmission chain structure in the embodiment of the present application further includes an oil throwing assembly 300, which is arranged on the second bearing 230. The oil throwing assembly 300 includes an oil throwing ring 310 and an oil blocking groove 320. The oil throwing ring 310 is arranged toward the gear box 100, and the oil blocking groove 320 is arranged relative to the oil throwing ring 310.

[0069] Specifically, the oil slinger assembly 300 is disposed on the second bearing 230, and the oil slinger assembly 300 is used to reduce the risk of oil entering the joint surface between the main shaft 210 and the planet carrier 110. The oil slinger ring 310 is used for guiding flow.

[0070] The oil slinger ring 310 and the oil blocking groove 320 prevent oil from entering the gear box from the joint surface between the main shaft 210 and the planet carrier 110, thereby improving the sealing effect.

[0071] The embodiment of the present application does not limit the structure of the oil slinger 310. For example, an annular thin sheet structure may be used, and its inner diameter matches the outer diameter of the main shaft 210 or the second bearing 230 to ensure a close fit and not hinder the rotation of the main shaft 210. The outer diameter of the oil slinger 310 can be designed according to the actual spatial layout to ensure that there is enough flow guide area. The oil slinger 310 is fixed to the corresponding position of the second bearing 230. The oil slinger 310 can be detachably connected to the second bearing 230. The oil slinger 310 can be fixed by means of positioning pins or slots to ensure that the oil slinger 310 does not undergo axial or radial displacement during rotation. When the oil splashes outward under the action of the rotational force, the oil slinger 310 guides the oil outward through its own annular structure to change the direction of movement and prevent the oil from flowing to the joint surface of the main shaft 210 and the planetary carrier 110.

[0072] It should be noted that one or more guide surfaces may be provided on the oil slinger 310, and the present application does not limit this. For example, the inclination angles of two adjacent guide surfaces are different.

[0073] The embodiment of the present application does not limit the structure of the oil blocking groove 320. For example, the oil blocking groove 320 is an annular groove structure, and its depth and width are determined according to the required oil blocking effect and the flow rate and flow rate of the oil, etc., and the present application does not limit this. The inner circumference of the oil blocking groove 320 has a certain gap with the outer diameter of the main shaft 210 or the second bearing 230 to avoid interference with the rotating parts, and the outer circumference can cooperate with other parts to form a sealing structure, such as a seal 400.

[0074] In one possible implementation, in the transmission chain structure in the embodiment of the present application, the second bearing 230 includes a bearing pressure plate 231, and the bearing pressure plate 231 has at least two oil-blocking protrusions 321 on the side facing the gear box 100, and each oil-blocking protrusion 321 is arranged at intervals, and an oil-blocking groove 320 is formed between two adjacent oil-blocking protrusions 321.

[0075] Specifically, the bearing pressing plate 231 is used for axial positioning of the second bearing body and the main shaft. In addition, the bearing pressing plate 231 can also play a certain sealing role to prevent lubricating oil leakage, and at the same time prevent external dust, impurities, etc. from entering the bearing interior and affecting the normal operation of the bearing.

[0076] Moreover, when the equipment is running, the bearing pressure plate 231 can help the bearing bear part of the load from the main shaft and transfer these loads to the foundation or other supporting structures of the equipment. For example, in a large wind turbine, the main shaft bears the huge weight of the wind wheel and various forces generated by the rotation. The bearing pressure plate 231 works together with the bearing to transfer these forces to the frame to ensure the stable operation of the entire system.

[0077] Among them, the oil flinger 310 can be formed by bending the bearing pressure plate 231, and the bearing pressure plate 231 has an inclined surface, and the inclined surface forms the oil flinger 310. The oil flinger 310 can also be formed by adding an inclined portion, and the inclined portion can be set on the bearing pressure plate 231, and can be set on the bearing seat.

[0078] For example, the oil blocking grooves 320 formed between adjacent oil blocking protrusions 321 are continuously distributed in the circumferential direction. During the operation of the equipment, after the oil is guided by the oil slinger 310, if some oil still splashes over, it will enter the oil blocking grooves 320. Due to the groove structure of the oil blocking grooves 320, the oil will accumulate therein, forming a certain oil blocking layer, preventing the oil from further penetrating into the joint surface of the main shaft 210 and the planetary carrier 110, thereby playing a role in blocking the oil.

[0079] In a possible implementation, the transmission chain structure in the embodiment of the present application further includes a seal 400 , and the seal 400 is disposed at one end of the main shaft 210 facing the gear box 100 .

[0080] The present application does not limit the structure and number of the seal 400 . The seal 400 is used to increase the sealing between the main shaft 210 and the planetary carrier 110 to prevent oil leakage and slippage from affecting the transmission torque.

[0081] The number of seals 400 may be four, two seals 400 are used for axial sealing of the main shaft 210, and two seals 400 are used for radial sealing of the main shaft 210, so as to enhance the sealing effect and prevent oil from entering the joint surface between the main shaft and the planet carrier.

[0082] The main shaft 210 has an end facing the planet carrier 110 and has a mating surface for mounting the sealing member 400 , and the sealing member 400 is disposed on the mating surface.

[0083] The present application does not limit the structure of the seal 400. For example, the seal 400 may be an O-ring. The O-ring is annular, has a circular cross section, has good elasticity, and can deform under a certain pressure to fill the sealing gap.

[0084] The O-ring is installed on the mating surface of the main shaft 210 facing the planetary carrier 110. For the axially sealed O-ring, it is installed in the corresponding groove or step of the mating surface in the axial direction. When the main shaft 210 and the planetary carrier 110 are axially pressed, the O-ring will deform under the action of the axial force, thereby achieving axial sealing and preventing oil from leaking in the axial direction. For the radially sealed O-ring, it will be installed in the radial sealing groove of the main shaft 210. Through the constraint of the sealing groove and its own elastic deformation, it is tightly attached to the corresponding surfaces of the main shaft 210 and the planetary carrier 110, preventing oil from penetrating from the radial direction.

[0085] In one possible implementation, in the transmission chain structure in the embodiment of the present application, the gearbox 100 also includes a sun gear 120, the sun gear 120 has an internal spline, the planet carrier 110 has an external spline, the internal spline is connected to the external spline, and the planet carrier 110 is connected to the main shaft 210.

[0086] It is understandable that, as the megawatt size of the wind turbine generator set increases, the outer inner spline connection mode between the sun gear 120 and the planet carrier 110, and the outer inner spline connection mode between the sun gear 120 and the spline shaft can be changed to an inner spline on the sun gear 120, an outer spline on the planet carrier 110, or an outer spline on the spline shaft. The inner spline on the sun gear 120 is connected to the outer spline of the planet carrier 110, and / or the inner spline on the sun gear 120 is connected to the outer spline of the spline shaft, and the spline pitch circle meets the transmission torque requirements, and can also reduce the proportion of expensive materials of the sun gear.

[0087] The internal splines are distributed on the inner hole surface of the sun gear 120, and the tooth shape thereof can be a spline form such as an involute spline or a rectangular spline. The embodiment of the present application does not limit this, and can be set according to actual conditions. It should be noted that the involute spline has a high load-bearing capacity and can be automatically centered, and the rectangular spline has a high centering accuracy. The external splines are arranged on the journal or other connecting parts of the planet carrier 110, and the tooth shape thereof must match the internal splines of the sun gear 120. The internal splines of the sun gear 120 are connected to the external splines of the planet carrier 110 to ensure that there is no relative sliding between the two when transmitting power, while ensuring the reliability of the connection to prevent disengagement or slipping during torque transmission.

[0088] The planetary gear train in the gear box 100 operates normally and transmits power to the generator. During assembly, the first connecting portion 111 is used to achieve a detachable connection with the second bearing 230 to ensure the compactness of the structure and the overall stability. During operation, the main shaft 210 rotates, and through the operation and power transmission of the planetary gear train, the oil-slinging assembly 300 prevents oil from entering the joint surface between the main shaft 210 and the planetary carrier 110, and other components ensure sealing.

[0089] In one possible implementation, in the transmission chain structure in the embodiment of the present application, the gearbox 100 also includes a planetary gear 130 and a fixing member 140, the fixing member 140 includes a pin 141 and a sleeve 142, the sleeve 142 is sleeved on the pin 141, and a gap is provided between the sleeve 142 and the pin 141, the planetary gear 130 is sleeved on the sleeve 142, the pin 141 is provided on the planetary carrier 110, and the planetary carrier 110 is a single web structure.

[0090] It should be noted that the planet carrier 110 may be a first-stage rotating frame, the first-stage rotating frame adopts a single web structure, and the first-stage planetary gear train adopts a structure in which a floating gap is reserved between the pin shaft and the planetary gear.

[0091] The first-stage rotating frame adopts a single web structure, that is, the first-stage rotating frame is in the shape of a frame as a whole, and the main supporting structure of the single web is only a single plate. The plate can reduce the use of materials to reduce weight while meeting the strength and rigidity requirements. A plurality of mounting positions are set on the plate for fixing the pin shaft 141. The distribution of the mounting positions is determined according to the number and layout of the planetary gears 130 of the planetary gear train to ensure that the spacing between the planetary gears 130 is uniform, so as to ensure that the force of the planetary gear train is uniform.

[0092] The fixing member 140 includes a pin 141 and a sleeve 142. The sleeve 142 is sleeved on the pin 141. A gap is provided between the sleeve 142 and the pin 141, and the gap is a floating gap. The planetary gear 130 is sleeved on the sleeve 142, and the pin 141 is provided on the planetary carrier 110, so that the pin 141 becomes a cantilever pin. The cantilever pin and the floating gap can better cope with the influence of the axis disturbance on the tooth surface meshing when the main shaft 210 is running.

[0093] The cooperation among the star wheel 130, the fixing part 140 and the planetary carrier 110 can effectively cope with the axial disturbance of the main shaft 210 during operation, and utilize the floating clearance between the bushing 142 and the pin shaft 141 to reduce the influence on the tooth surface meshing. Meanwhile, the single web structure of the planetary carrier 110 helps to reduce the weight of the transmission chain structure and improve the overall performance of the system while ensuring the structural strength.

[0094] In a possible implementation, in the transmission chain structure in the embodiment of the present application, the first bearing 220 is a grease-lubricated bearing, and the second bearing 230 is an oil-lubricated bearing.

[0095] It should be noted that the first bearing 220 is a grease-lubricated bearing, which can reduce the number of sealing structures such as skeleton oil seals and labyrinth sealing rings, thereby reducing the operation and maintenance costs of the sealing structure.

[0096] The present application does not limit the lubrication structure of the first bearing 220, and it can be set according to actual conditions. For example, the first bearing 220 is a grease-lubricated bearing, which uses grease lubrication and has a relatively simple sealing structure. A single lip or double lip seal can be used to form a seal with the bearing seat or the main shaft 210 to prevent grease leakage and external contaminants from entering. In order to facilitate the injection of grease, a grease injection channel may be provided on the bearing seat or the bearing, and the channel may have a grease injection port, through which the grease is injected between the rolling element and the raceway inside the bearing, and the grease injection port may be equipped with a sealing cover to prevent grease contamination and leakage.

[0097] The present application does not impose any restrictions on the lubrication structure of the second bearing 230, which can be set according to actual conditions. For example, the second bearing 230 is an oil-lubricated bearing, which uses oil lubrication and can be coordinated with the oil lubrication of the gearbox 100, or can be set separately. The present application does not impose any restrictions on this.

[0098] Therefore, the first bearing 220 and the second bearing 230 respectively adopt different lubrication methods, which can reduce the volume of the oil cavity, reduce the seal size, and reduce the probability of leakage.

[0099] On the other hand, the present application provides a wind turbine generator set, comprising a main body and a transmission chain structure in any one of the above embodiments arranged on the main body.

[0100] The wind turbine generator set includes a wind wheel and a generator. The wind turbine generator set is arranged on a frame. The transmission chain structure includes a gear box 100 and a transmission assembly 200. The transmission assembly 200 includes a main shaft 210, a first bearing 220 and a second bearing 230. The first bearing 220 and the second bearing 230 are sleeved on the main shaft 210 along the axial direction of the main shaft 210. The second bearing 230 is connected to the gear box 100. The second bearing 230 and the first bearing 220 are both used to be fixed on the frame. One end of the main shaft 210 is connected to the wind wheel, and the other end is connected to the connecting end of the gear box 100.

[0101] It should be noted that the transmission chain structure can be a large megawatt transmission chain structure. The transmission chain structure in the embodiment of the present application highly integrates the second bearing 230 with the gearbox 100, reduces the overall weight, and has a compact structure. Compared with the existing one-piece front-end integrated bearing seat, it reduces the size of a single casting and reduces the risk of casting defects. Moreover, after the second bearing 230 is rigidly connected to the frame, an over-constraint structure is not used, the elastic support is cancelled, and an outer rigid inner rigid structure is used instead. The main shaft 210 is consistent with the axis of the first-stage turret, and the bearing seat is consistent with the axis of the gear ring, which reduces the torsional swing of the gearbox, cancels the first-stage turret bearing, facilitates the use of the planetary stage side clearance to appropriately maintain some flexibility, and saves the cost of the first-stage turret bearing.

[0102] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0103] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A transmission chain structure, characterized in that: include: A gear box (100), the gear box (100) having a connection end; A transmission assembly (200), the transmission assembly (200) comprising a main shaft (210), a first bearing (220) and a second bearing (230), one end of the main shaft (210) being connected to the connecting end, the first bearing (220) and the second bearing (230) being sleeved on the main shaft (210) at intervals along the axial direction of the main shaft (210), the second bearing (230) being connected to the gear box (100), and the second bearing (230) and the first bearing (220) being both used for fixing on a part to be mounted.

2. The transmission chain structure according to claim 1, characterized in that: The gear box (100) has a first connection portion (111) at one end facing the second bearing (230), and the second bearing (230) includes a bearing seat, and the bearing seat is detachably connected to the first connection portion (111).

3. The transmission chain structure according to claim 2, characterized in that: The second bearing (230) further comprises a second bearing body, the bearing seat has a mounting cavity, the second bearing body is arranged in the bearing seat, the second bearing body is connected to the main shaft (210), the gear box (100) has a planet carrier (110), and the planet carrier (110) is connected to the main shaft (210) via the second bearing body.

4. The transmission chain structure according to claim 1, characterized in that: The invention also comprises an oil-slinging assembly (300), wherein the oil-slinging assembly (300) is arranged on the second bearing (230), and the oil-slinging assembly (300) comprises an oil-slinging ring (310) and an oil-blocking groove (320), wherein the oil-slinging ring (310) is arranged toward the gear box (100), and the oil-blocking groove (320) is arranged relative to the oil-slinging ring (310).

5. The transmission chain structure according to claim 4, characterized in that: The second bearing (230) comprises a bearing pressure plate (231), and the bearing pressure plate (231) has at least two oil blocking protrusions (321) on a side facing the gear box (100), and the oil blocking protrusions (321) are arranged at intervals, and the oil blocking groove (320) is formed between two adjacent oil blocking protrusions (321).

6. The transmission chain structure according to any one of claims 1 to 5, characterized in that: The invention also includes a sealing member (400), wherein the sealing member (400) is arranged at one end of the main shaft (210) facing the gear box (100).

7. The transmission chain structure according to any one of claims 3 to 5, characterized in that: The gearbox (100) further comprises a sun gear (120), the sun gear (120) having an internal spline, the planet carrier (110) having an external spline, the internal spline being connected to the external spline, and the planet carrier (110) being connected to the main shaft (210).

8. The transmission chain structure according to claim 7, characterized in that: The gearbox (100) further comprises a planetary gear (130) and a fixing member (140), wherein the fixing member (140) comprises a pin shaft (141) and a shaft sleeve (142), wherein the shaft sleeve (142) is sleeved on the pin shaft (141), and a gap is provided between the shaft sleeve (142) and the pin shaft (141), wherein the planetary gear (130) is sleeved on the shaft sleeve (142), and the pin shaft (141) is provided on the planetary carrier (110), and the planetary carrier (110) is a single web structure.

9. The transmission chain structure according to any one of claims 1 to 5, characterized in that: The first bearing (220) is a grease-lubricated bearing, and the second bearing (230) is an oil-lubricated bearing.

10. A wind turbine generator set, characterized in that: The invention comprises a main body and a transmission chain structure according to any one of claims 1 to 9 arranged on the main body.

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