Gear box and wind generating set

Abstract

A storage cavity is formed in a planet shaft in the gearbox, the storage cavity penetrates through the planet shaft in the axial direction of the planet shaft, an inlet and an outlet are formed in the two ends of the storage cavity in the axial direction, and the storage cavity is configured to contain a lubricating medium; an oil inlet hole corresponding to the inlet is formed in the mounting frame, the oil inlet hole corresponds to the inlet in the axial direction and is communicated with the inlet, and the inlet and the oil inlet hole are eccentrically arranged in the radial direction of the planet shaft; an oil supply channel is arranged in the planet shaft, one end of the oil supply channel communicates with the storage cavity, the other end of the oil supply channel communicates with the annular cavity, and the lubricating medium in the storage cavity can flow into the annular cavity from the oil supply channel under the action of gravity. According to the gear box and the wind generating set provided by the embodiment of the invention, lubricating oil can be injected into the bearing when the gear box is in a static state, passive lubrication of the bearing is realized, and the safety performance of the bearing is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and particularly to a gearbox and a wind turbine generator set. Background Art

[0002] As a support and positioning rotating component for shaft parts, a sliding bearing has the advantages of high load-bearing capacity, simple structure, high reliability, easy installation and maintenance, and reduction of the weight of the gearbox.

[0003] Based on the structural characteristics of the sliding bearing, the requirements for the lubricating oil temperature control, oil quantity and pressure control, and cleanliness of the internal bearings of the gearbox in a wind turbine are very high. It is necessary to control not only during the operation of the gearbox, but also to lubricate the bearings during its storage and transportation.

[0004] However, in the stationary state of the gearbox, it is not convenient for the staff to inject lubricating oil into the bearings, which easily causes wear between the bearings in the case of lack of lubricating oil, and thus there is a risk of bearing failure. Summary of the Invention

[0005] Embodiments of the present invention provide a gearbox and a wind turbine generator set, which can inject lubricating oil into the bearings when the gearbox is in a stationary state, realize passive lubrication of the bearings, and improve the safety performance of the bearings.

[0006] On the one hand, a gearbox is proposed according to an embodiment of the present invention, including a planetary carrier, planetary shafts, planetary gears, and bearings. The planetary carrier includes a connecting shaft and a mounting frame; the planetary shafts are arranged on the mounting frame; the planetary gears are sleeved on the outer circumference of the planetary shafts, and an annular cavity is formed between the planetary gears and the planetary shafts; the bearings are arranged in the annular cavity, the bearings surround the planetary shafts and are rotationally matched with the planetary gears;

[0007] A storage cavity is provided on the planetary shaft, the storage cavity axially penetrates the planetary shaft and has an inlet and an outlet at both axial ends, and the storage cavity is configured to hold a lubricating medium;

[0008] The mounting frame is provided with an oil inlet hole corresponding to the inlet, the oil inlet hole is axially corresponding to and communicated with the inlet, and the inlet and the oil inlet hole are eccentrically arranged in the radial direction of the planetary shaft;

[0009] An oil supply channel is provided in the planetary shaft, one end of the oil supply channel is communicated with the storage cavity and the other end is communicated with the annular cavity, and the lubricating medium in the storage cavity can flow into the annular cavity through the oil supply channel by the action of gravity.

[0010] According to an aspect of the embodiments of the present invention, the gearbox includes a positioning pin, the positioning pin is connected between the planetary shaft and the mounting frame, and the minimum perpendicular distance from the positioning pin to the axis of the connecting shaft is less than the minimum perpendicular distance from the oil inlet hole to the axis;

[0011] The number of oil inlet holes is multiple and they are distributed around the axis along the first pitch circle. The number of positioning pins is multiple and they are distributed around the axis along the second pitch circle. The radial dimension of the first pitch circle is larger than that of the second pitch circle.

[0012] According to one aspect of the embodiments of the present invention, in the axial direction of the planetary shaft, the orthographic projection of the oil inlet hole and the orthographic projection of the inlet of the storage cavity at least partially overlap, and the radial dimension of the oil inlet hole is smaller than that of the inlet.

[0013] According to one aspect of the embodiments of the present invention, the orthographic projection of the oil inlet hole in the axial direction is located within the orthographic projection of the inlet.

[0014] According to one aspect of the embodiments of the present invention, the inlet of the storage cavity is a circular opening, the oil inlet hole is a circular hole, and the center distance between the orthographic projection of the inlet in the axial direction of the planetary shaft and the orthographic projection of the oil inlet hole is 30 - 50 mm.

[0015] According to one aspect of the embodiments of the present invention, the oil supply channel includes multiple oil supply branches. One end of each oil supply branch is communicated with the storage cavity and the other end is communicated with the annular cavity. The ports where the multiple oil supply branches are respectively communicated with the annular cavity are distributed at intervals along the axial direction.

[0016] According to one aspect of the embodiments of the present invention, the multiple oil supply branches include a first branch and a second branch. The first branch extends along the radial direction of the planetary shaft. The second branch includes a first part and a second part connected to each other. The first part extends along the axial direction of the planetary shaft and the second part extends along the radial direction. The second branch is communicated with the storage cavity through the first part and is communicated with the annular cavity through the second part. The second branch is arranged on the side of the storage cavity close to the connecting shaft in the radial direction.

[0017] According to one aspect of the embodiments of the present invention, the storage cavity includes a first cavity and a second cavity which are communicated with each other. The radial dimension of the first cavity is larger than that of the second cavity and a blocking wall is formed between them. The inlet is formed in the first cavity. One end of the oil supply channel is communicated with the first cavity and the other end is communicated with the annular cavity. A part of the lubricating medium in the first cavity enters the oil supply channel under the action of gravity and another part crosses the blocking wall and enters the second cavity.

[0018] According to one aspect of the embodiments of the present invention, an oil return channel and an oil drain hole located at the second cavity are arranged in the planetary shaft. One end of the oil return channel is communicated with the annular cavity and the other end is connected to the oil drain hole to be communicated with the second cavity. The lubricating medium in the annular cavity flows back to the second cavity through the oil return channel and is discharged.

[0019] According to one aspect of an embodiment of the present invention, the second cavity includes a first sub-cavity and a second sub-cavity that communicate with each other. The second sub-cavity is connected to a side of the first sub-cavity facing away from the first cavity. The radial dimension of the second sub-cavity is greater than that of the first sub-cavity. The lubricating medium flowing through the first sub-cavity enters the second sub-cavity and then is discharged.

[0020] According to one aspect of an embodiment of the present invention, an oil delivery channel is provided on the planetary shaft. The oil delivery channel and the oil supply channel are distributed at intervals. One end of the oil delivery channel communicates with the oil sump and the other end communicates with the annular cavity. The oil delivery channel is configured to transmit the lubricating medium driven by the oil pump.

[0021] In another aspect, according to an embodiment of the present invention, a wind turbine generator set is provided, including the gearbox as described above.

[0022] The embodiment of the present invention provides a gearbox and a wind turbine generator set. By providing a storage cavity and an oil supply channel on the planetary shaft, and providing an oil inlet hole corresponding to the inlet of the storage cavity on the planetary carrier, the lubricating oil is injected into the storage cavity by using the oil inlet hole. By connecting the storage cavity and the annular cavity where the bearing is located through the oil supply channel, the lubricating oil in the storage cavity flows to the annular cavity under the action of gravity through the oil supply channel, thereby realizing the lubrication of the bearing in the static state. Eccentrically arranging the inlet of the storage cavity and the oil inlet hole can also prevent the reverse flow and discharge of the lubricating oil, enabling the lubricating oil to better flow into the annular cavity from the oil supply channel under the action of gravity, passively lubricating the bearing therein, improving the lubrication ability of the bearing in the static state, forming better lubrication protection for the bearing, improving the safety performance of the bearing when it is stationary, and avoiding adverse situations such as the failure of the bearing. Description of the Drawings

[0023] Hereinafter, the features, advantages, and technical effects of exemplary embodiments of the present invention will be described with reference to the drawings.

[0024] Figure 1 is a schematic structural diagram of a wind turbine generator set according to an embodiment of the present invention;

[0025] Figure 2 is a partial cross-sectional view of a gearbox according to an embodiment of the present invention;

[0026] Figure 3 is a partial front view of a gearbox according to an embodiment of the present invention;

[0027] Figure 4 is a partial cross-sectional view of another gearbox according to an embodiment of the present invention;

[0028] Figure 5 is an axonometric view of a planetary shaft according to an embodiment of the present invention;

[0029] Figure 6It is a partial sectional view of a planetary shaft according to an embodiment of the present invention;

[0030] Figure 7 It is a structural diagram of a planetary shaft according to an embodiment of the present invention;

[0031] Figure 8 It is a structural diagram of another planetary shaft according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] 100 - Gearbox; 200 - Tower; 300 - nacelle; 400 - Impeller; 401 - Hub; 402 - Blade;

[0034] 10 - Mounting bracket; 20 - Planetary shaft; 30 - Planetary gear; 40 - Bearing; 50 - Locating pin;

[0035] 1 - Oil inlet hole; 2 - Storage cavity; 21 - First cavity; 22 - Second cavity; 22a - First sub - cavity; 22b - Second sub - cavity;

[0036] 3 - Annular cavity; 4 - Oil supply channel; 41 - First branch; 42 - Second branch; 4a - First part; 4b - Second part;

[0037] 5 - Oil drain hole; 6 - Oil transmission channel; 7 - Oil return channel.

[0038] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale. Detailed implementation manners

[0039] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention. In the drawings and the following description, at least some of the well - known structures and technologies are not shown in order to avoid unnecessarily obscuring the present invention; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0040] The orientation terms used in the following description are all the directions shown in the figures, and do not limit the specific structures of the gearbox and the wind turbine generator set of the present invention. In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] As Figure 1 shown, the wind turbine generator set provided by the embodiment of the present application includes components such as a tower 200, a nacelle 300, and an impeller 400. The tower 200 is connected to the wind turbine foundation. The nacelle 300 is arranged at the top of the tower 200. The nacelle 300 includes a base, and the nacelle 300 can be connected to the tower 200 through the base. A generator and a gearbox 100 are arranged in the nacelle 300. The impeller 400 includes a hub 401 and blades 402. The hub 401 is connected to the generator through the gearbox 100. When the wind acts on the blades 402, it can drive the blades 402 to drive the hub 401 to rotate. The hub 401 drives the rotor of the generator to rotate relative to the stator through the gearbox 100, realizing the conversion of wind energy into electrical energy.

[0042] Based on the structural characteristics of the sliding bearing, the requirements for the lubricating oil temperature control, oil quantity and pressure control, and cleanliness of the bearing 40 inside the gearbox 100 of the wind turbine generator set are very high. It is necessary to control not only during the operation of the gearbox 100, but also to lubricate the bearing 40 during its storage and transportation.

[0043] However, when the gearbox 100 is in a stationary state, it is not convenient for the staff to inject lubricating oil into the bearing 40, which easily causes wear between the bearings 40 in the case of lack of lubricating oil, and thus there is a risk of bearing 40 failure.

[0044] Based on this, the embodiment of the present application also provides a gearbox 100. This gearbox 100 can be used in a wind turbine generator set and is a component of the wind turbine generator set. Of course, it can also be produced and sold as an independent product. This gearbox 100 can inject lubricating oil into the bearing 40 in a stationary state, realizing the passive lubrication of the bearing 40 and improving the safety performance of the bearing 40.

[0045] To better understand the present invention, the following combines Figures 2 to 8 to describe the gearbox 100 and the wind turbine generator set of the embodiment of the present invention in detail.

[0046] Please refer to Figures 2 to 4, an embodiment of the present invention provides a gearbox 100, which includes a planetary carrier, a planetary shaft 20, planetary gears 30, and bearings 40. The planetary carrier includes a connecting shaft and a mounting bracket 10; the planetary shaft 20 is disposed on the mounting bracket 10; the planetary gears 30 are sleeved on the outer periphery of the planetary shaft 20, and an annular cavity 3 is formed between the planetary gears 30 and the planetary shaft 20; the bearings 40 are disposed in the annular cavity 3, and the bearings 40 are arranged around the planetary shaft 20 and are rotationally matched with the planetary gears 30;

[0047] A storage cavity 2 is provided on the planetary shaft 20. The storage cavity 2 axially penetrates the planetary shaft 20 and has an inlet and an outlet at both axial ends. The storage cavity 2 is configured to hold a lubricating medium;

[0048] The mounting bracket 10 is provided with an oil inlet hole 1 corresponding to the inlet. The oil inlet hole 1 is axially corresponding to and communicated with the inlet, and the inlet and the oil inlet hole 1 are eccentrically arranged in the radial direction of the planetary shaft 20;

[0049] An oil supply channel 4 is provided in the planetary shaft 20. One end of the oil supply channel 4 is communicated with the storage cavity 2 and the other end is communicated with the annular cavity 3. The lubricating medium in the storage cavity 2 can flow into the annular cavity 3 through the oil supply channel 4 under the action of gravity.

[0050] In the gearbox 100 of a wind turbine generator, a plurality of planetary gears 30 are provided on the mounting bracket 10. Each planetary gear 30 is respectively sleeved on its corresponding planetary shaft 20, and the planetary gear 30 can rotate relative to the planetary shaft 20, so as to realize the speed change transmission function of the gearbox 100.

[0051] Since the planetary gear 30 rotates relative to the planetary shaft 20, bearings 40 are provided in the annular cavity 3 formed between the two. Optionally, the bearings 40 can be sliding bearings, and a lubricating medium needs to be injected into the annular cavity 3 where the bearings 40 are located to meet the lubrication requirements of the bearings 40 during operation.

[0052] Considering that the bearings 40 also need to be lubricated under static conditions such as storage and transportation of the gearbox 100, a storage cavity 2 and an oil supply channel 4 communicated therewith are provided on the planetary shaft 20 in this embodiment. The lubricating medium in the storage cavity 2 is introduced into the annular cavity 3 by the action of gravity, so as to realize the injection of the lubricating medium into the bearings 40 under the static condition of the gearbox 100. Optionally, the lubricating medium can be lubricating oil.

[0053] An oil inlet hole 1 communicating with the inlet of the storage cavity 2 is provided on the mounting bracket 10. Under the static condition, during various tests of the gearbox 100 before, through oil slinging and forced oil injection, a certain amount of lubricating medium remains in the storage cavity 2. This part of the lubricating medium enters the oil supply channel 4 communicating with the storage cavity 2 under the action of gravity, and then enters the annular cavity 3 where the bearing 40 is located from the other end of the oil supply channel 4, thereby passively lubricating the bearing 40.

[0054] Under the operating condition, during the process of multiple planet gears 30 rotating around the main shaft, when the planet gear 30 rotates to the bottom of the gearbox 100, the planet shaft 20 is immersed in the oil pool at the bottom, and the planet shaft 20 is below the liquid level line. At this time, the lubricating medium will enter the storage cavity 2 of the planet shaft 20 through the oil inlet hole 1, and the lubricating medium will accumulate in the storage cavity 2, so that there is a stock of lubricating medium in the storage cavity 2; when the planet gear 30 rotates to the top, due to the presence of stored oil in the storage cavity 2, even after the gearbox 100 stops operating, the stored oil in the storage cavity 2 can be transported to the annular cavity 3 by gravity through the provided oil supply channel 4 to passively lubricate the bearing 40. This application does not make special restrictions on the source of the lubricating medium, as long as it can ensure that there is a stock of lubricating medium in the storage cavity 2.

[0055] The above process is completed when the gearbox 100 is stationary, that is, the flow process does not rely on external driving components such as oil pumps. The flow force of the lubricating medium depends on its own gravity, so it belongs to a passive lubrication process and is applicable to the static condition.

[0056] In this embodiment, the oil inlet hole 1 on the mounting bracket 10 is communicated with the inlet of the internal storage cavity 2. The external lubricating medium enters the storage cavity 2 through the oil inlet hole 1. At the same time, the inlet of the storage cavity 2 and the oil inlet hole 1 are eccentrically arranged, so that the lubricating medium entering the storage cavity 2 will not easily flow back and be discharged from the oil inlet hole 1, better retaining the lubricating medium in the storage cavity 2, avoiding excessive loss, and ultimately being unable to continuously lubricate the bearing 40.

[0057] This application does not make special restrictions on the eccentric position between the inlet of the storage cavity 2 and the oil inlet hole 1, as long as it can form a certain obstruction to the backflow of the lubricating medium to avoid direct connection between the two.

[0058] An embodiment of the present invention provides a gearbox 100. By providing a storage cavity 2 and an oil supply channel 4 on the planetary shaft 20, and providing an oil inlet hole 1 corresponding to the inlet of the storage cavity 2 on the mounting bracket 10, the lubricating oil is injected into the storage cavity 2 through the oil inlet hole 1. By connecting the storage cavity 2 with the annular cavity 3 where the bearing 40 is located through the oil supply channel 4, the lubricating oil in the storage cavity 2 flows to the annular cavity 3 under the action of gravity through the oil supply channel 4, thereby realizing the lubrication of the bearing 40 in a static state. The eccentric setting of the inlet of the storage cavity 2 and the oil inlet hole 1 can also prevent the backflow and discharge of the lubricating oil, enabling the lubricating oil to better drain into the annular cavity 3 from the oil supply channel 4 under the action of gravity, passively lubricating the bearing 40 therein, improving the lubrication ability of the bearing 40 in a static state, forming better lubrication protection for the bearing 40, and improving the safety performance of the bearing 40 when it is stationary, avoiding adverse situations such as the failure of the bearing 40.

[0059] As an alternative embodiment, please refer to Figure 2 and combine with Figure 3 , the gearbox 100 includes a positioning pin 50, the positioning pin 50 is connected between the planetary shaft 20 and the mounting bracket 10, and the minimum vertical distance from the positioning pin 50 to the axis of the connecting shaft is less than the minimum vertical distance from the oil inlet hole 1 to the axis;

[0060] The number of the oil inlet holes 1 is multiple and they are distributed along the first pitch circle around the axis, the number of the positioning pins 50 is multiple and they are distributed along the second pitch circle around the axis, and the radial dimension of the first pitch circle is larger than the radial dimension of the second pitch circle.

[0061] In this embodiment, on the basis of making the oil inlet hole 1 communicate with the inlet of the storage cavity 2, the oil inlet hole 1 is always located on the side of the inlet of the storage cavity 2 away from the rotating main shaft.

[0062] When the planetary gear 30 rotates to the oil pool at the bottom of the gearbox 100, the oil inlet hole 1 is located below the inlet of the storage cavity 2, so as to facilitate the lubricating medium in the oil pool to enter the storage cavity 2 through the oil inlet hole 1; when the planetary gear 30 rotates to the top, at this time the oil inlet hole 1 is located above the inlet of the storage cavity 2. As shown in the figure, on the premise that the lubricating medium has been injected into the storage cavity 2 through the oil inlet hole 1, the oil inlet hole 1 at this position is eccentrically above the inlet of the storage cavity 2, avoiding the backflow loss of the accumulated lubricating medium in the storage cavity 2 through the oil inlet hole 1, and providing conditions for subsequent static passive oil supply.

[0063] Optionally, a positioning pin 50 is provided in the gearbox 100. The positioning pin 50 is first installed on the planetary shaft 20, and then assembled between the planetary shaft 20 and the planetary bracket 10 by means of the temperature difference method or the like to form a stable connection. The main function of the positioning pin 50 is to position the installation of the planetary shaft 20.

[0064] Optionally, there is a predetermined phase relationship between the positioning pin 50 and the oil inlet hole 1. By making the pitch circle diameter where multiple positioning pins 50 are located smaller than the pitch circle diameter where multiple oil inlet holes 1 are located, the oil inlet holes 1 are always located on the side of the positioning pins 50 away from the rotating main shaft. The relative positional relationship of the oil inlet holes 1 can be determined through the positions of the positioning pins 50, realizing the connection between the oil inlet holes 1 and the inlet of the storage cavity 2 and the eccentric setting.

[0065] An embodiment of the present invention provides a gearbox 100. By utilizing the positioning function of the positioning pin 50 and according to the predetermined phase relationship between the positioning pin 50 and the oil inlet hole 1, it has a more accurate positional relationship, and the assembly process of the planetary shaft 20 is completed faster, ensuring the connection between the oil inlet hole 1 and the inlet of the storage cavity 2 while realizing the eccentric setting.

[0066] Optionally, the oil supply channel 4 is arranged on the same side of the storage cavity 2 as the positioning pin 50. At this time, the position of the oil supply channel 4 can be determined according to the predetermined phase relationship between the positioning pin 50 and the oil supply channel 4. The positioning pin 50 and the oil supply channel 4 are on the same side of the storage cavity 2, that is, on the side closer to the rotating main shaft, which is convenient for realizing the gravity supply of the lubricating medium by the oil supply channel 4. Since the phase relationship between the two is determined, when the assembly is completed through the positioning pin 50, the position of the oil supply channel 4 can be determined.

[0067] When the planetary gear 30 rotates to the oil sump at the bottom of the gearbox 100, the oil supply channel 4 is located above the storage cavity 2 and is integrally immersed in the oil sump, and at this time, the lubrication effect is available; when the planetary gear 30 rotates to the top, the oil supply channel 4 is located below the storage cavity 2 at this time. Under static working conditions, it is convenient to supply oil through the oil supply channel 4 by gravity.

[0068] An embodiment of the present invention provides a gearbox 100. By utilizing the positioning function of the positioning pin 50 and according to the predetermined phase relationship between the positioning pin 50 and the oil supply channel 4, it has a more accurate positional relationship, and the assembly process of the planetary shaft 20 is completed faster, ensuring the effect of gravity oil supply.

[0069] As an optional embodiment, please refer to Figure 2 and Figure 3 , in the axial direction of the planetary shaft 20, the orthographic projection of the oil inlet hole 1 and the orthographic projection of the inlet of the storage cavity 2 at least partially overlap.

[0070] Optionally, on the basis that the inlet of the storage cavity 2 and the oil inlet hole 1 are eccentric, the inlet of the storage cavity 2 can completely cover the oil inlet hole 1 in the axial direction. At this time, the eccentric setting can be realized by adjusting their radial dimensions. Of course, when their radial dimensions are equal, their projections in the axial direction can also partially overlap, and the eccentric setting can also be realized.

[0071] An embodiment of the present invention provides a gearbox 100. By adjusting the positional relationship between the inlet of the storage cavity 2 and the oil inlet hole 1, an eccentric setting between the two is achieved, thereby avoiding losses caused by the reverse flow of the lubricating medium in the storage cavity 2 and providing a reliable guarantee for the continuous passive lubrication of the bearing 40.

[0072] As an alternative embodiment, please continue to refer to Figure 2 and Figure 3 , the radial dimension of the oil inlet hole 1 is smaller than the radial dimension of the inlet, and no special limitation is imposed on the specific numerical values of the dimensions of the two in this application.

[0073] An embodiment of the present invention provides a gearbox 100. On the basis of the eccentricity between the inlet of the storage cavity 2 and the oil inlet hole 1, the size of the oil inlet hole 1 is further reduced. While enabling the injection of lubricating grease through the oil inlet hole 1, the reverse backflow of the lubricating medium in the storage cavity 2 is slowed down, and the possibility of reverse flow loss of the lubricating medium is further reduced.

[0074] As an alternative embodiment, the orthographic projection of the oil inlet hole 1 in the axial direction is located within the orthographic projection of the inlet.

[0075] An embodiment of the present invention provides a gearbox 100. By completely covering the oil inlet hole 1 with the inlet of the storage cavity 2 in the axial direction, while controlling the reverse backflow of the lubricating medium from the oil inlet hole 1, the connection dimension between the oil inlet hole 1 and the inlet is also ensured, preventing the situation of poor oil inlet caused by the too small size of the oil inlet hole 1, and further ensuring the stock of the lubricating medium in the storage cavity 2.

[0076] As an alternative embodiment, please continue to refer to Figure 2 and Figure 3 , the inlet of the storage cavity 2 is a circular opening, the oil inlet hole 1 is a round hole, and the center distance between the orthographic projection of the inlet in the axial direction of the planetary shaft 20 and the orthographic projection of the oil inlet hole 1 is 30 - 50 mm.

[0077] No special limitation is imposed on the shapes of the inlet of the storage cavity 2 and the oil inlet hole 1 in this application. Optionally, the shapes selected in this embodiment are circular. The round hole is beneficial to reducing the resistance of injecting the lubricating medium, making it easier to inject the lubricating medium into the storage cavity 2 and ensuring the stock of the lubricating medium in the storage cavity 2.

[0078] Regarding the eccentric distance between the two round holes, setting it between 30 - 50 mm can not only ensure the injection of the lubricating medium, but also prevent the reverse flow loss of the lubricating medium through eccentricity, comprehensively considering the control of the flow direction of the lubricating medium.

[0079] An embodiment of the present invention provides a gearbox 100. By adopting the design of circular holes and controlling the eccentric distance between the two, it can not only ensure the effective injection of the lubricating medium, but also prevent the reverse flow of the lubricating medium, and better store it in the storage cavity 2.

[0080] As an alternative embodiment, please refer to Figure 2 and combine with Figure 7 , the oil supply channel 4 includes a plurality of oil supply branches. One end of each oil supply branch is communicated with the storage cavity 2 and the other end is communicated with the annular cavity 3. The ports of the plurality of oil supply branches communicating with the annular cavity 3 are distributed at intervals along the axial direction.

[0081] Optionally, the oil supply channel 4 can be set to be multiple, and each oil supply branch is connected between the storage cavity 2 and the annular cavity 3 to realize the injection of the lubricating medium. This application does not make special limitations on the number of oil supply branches.

[0082] When the lubricating medium in the storage cavity 2 enters each oil supply branch under the action of gravity, each oil supply branch jointly transports the lubricating medium into the annular cavity 3. It can be understood that the more the oil supply branches are set, the higher the efficiency of passive lubrication.

[0083] Since the ports of each oil supply branch communicating with the annular cavity 3 are distributed at intervals in the axial direction, the plurality of oil supply branches perform static injection of the lubricating medium at multiple points in the annular cavity 3, realizing passive lubrication at different positions of the annular cavity 3, making the lubrication of the bearing 40 more uniform, ensuring the lubrication effect at multiple positions of the bearing 40, and avoiding local damage caused by uneven lubrication of the bearing 40.

[0084] An embodiment of the present invention provides a gearbox 100. By arranging a plurality of oil supply branches between the annular cavity 3 and the storage cavity 2, the lubricating medium can be injected simultaneously, improving the lubrication efficiency of the bearing 40, accelerating the passive lubrication process of the bearing 40, and forming a more sufficient lubrication protection for the bearing 40.

[0085] As an alternative embodiment, please refer to Figure 7 , the plurality of oil supply branches include a first branch 41 and a second branch 42. The first branch 41 extends along the radial direction of the planetary shaft 20. The second branch 42 includes a first part 4a and a second part 4b connected to each other. The first part 4a extends along the axial direction of the planetary shaft 20 and the second part 4b extends along the radial direction. The second branch 42 is communicated with the storage cavity 2 through the first part 4a and is communicated with the annular cavity 3 through the second part 4b. The second branch 42 is arranged on the side of the storage cavity 2 close to the connecting shaft in the radial direction.

[0086] In this embodiment, the oil supply branch is specifically set to two. The first branch 41 extends radially, and the lubricating medium directly flows radially in the first branch 41 to the annular cavity 3. The second branch 42 first extends axially by a certain distance along the first part 4a, and then is radially connected to the annular cavity 3 along the second part 4b. The lubricating medium entering the second branch 42 first flows axially for a certain distance and finally flows radially to the annular cavity 3.

[0087] This application does not make special restrictions on the specific flow direction of the branch, as long as it can ensure that the lubricating medium finally enters the annular cavity 3.

[0088] The embodiment of the present invention provides a gearbox 100. By setting the first branch 41 and the second branch 42 with different flow directions, the lubricating medium in the storage cavity 2 has different injection points on the annular cavity 3. The injection points of the first branch 41 and the second branch 42 are arranged at intervals, realizing uniform injection of the annular cavity 3 and uniform lubrication of the bearing 40, preventing lubrication failure and other phenomena caused by uneven distribution of the lubricating medium.

[0089] As an alternative embodiment, please refer to Figure 7 , the storage cavity 2 includes a first cavity 21 and a second cavity 22 that communicate with each other. The radial dimension of the first cavity 21 is larger than that of the second cavity 22, and a blocking wall is formed between them. The inlet is formed in the first cavity 21. One end of the oil supply channel 4 communicates with the first cavity 21 and the other end communicates with the annular cavity 3. Part of the lubricating medium in the first cavity 21 enters the oil supply channel 4 under the action of gravity, and the other part crosses the blocking wall and enters the second cavity 22.

[0090] Optionally, the specific structure of the storage cavity 2 in this embodiment can be formed by the communication of the first cavity 21 and the second cavity 22. There are differences in size between the first cavity 21 and the second cavity 22, and they have different accommodation capacities. In this way, a blocking wall, that is, a stepped structure, is formed at the connection position between the two.

[0091] When the external lubricating medium enters the first cavity 21 through the oil inlet hole 1, since the oil supply channel 4 is specifically communicated with the first cavity 21, under the action of gravity, part of the lubricating medium in the first cavity 21 enters the oil supply channel 4 and is introduced into the annular cavity 3, and the other part of the lubricating medium gradually crosses the blocking wall between the two cavities and enters the second cavity 22 for discharge.

[0092] The function of the above-mentioned blocking wall is to slow down the flow rate of the lubricating medium entering the storage cavity 2, so that the flow rate of the lubricating medium in the storage cavity 2 will not be too fast to cause loss. The purpose is to retain more lubricating medium in the first cavity 21 and introduce it into the annular cavity 3 through the oil supply channel 4 under the action of gravity.

[0093] This application does not impose special limitations on the specific dimensions of the first cavity 21 and the second cavity 22. It is only necessary to ensure that there is a difference between the two to form a blocking wall, and the ultimate goal is to slow down the flow rate of the lubricating medium in the storage cavity 2.

[0094] An embodiment of the present invention provides a gearbox 100. By setting the structure of the storage cavity 2 as a communicating structure of the first cavity 21 and the second cavity 22, a blocking wall is formed by using the dimensional difference between the two, thereby slowing down the flow rate of the lubricating medium in the storage cavity 2, avoiding losses caused by too fast a flow rate, and further preventing too little lubricating medium from entering the annular cavity 3 and being unable to lubricate the bearing 40, indirectly improving the lubrication protection ability for the bearing 40.

[0095] As an alternative embodiment, please refer to Figures 5 to 7 , an oil return passage 7 is provided in the planetary shaft 20 and an oil drain hole 5 is located at the second cavity. One end of the oil return passage 7 communicates with the annular cavity 3 and the other end is connected to the oil drain hole 5 to communicate with the second cavity 22. The lubricating medium in the annular cavity 3 flows back to the second cavity 22 through the oil return passage 7 and is discharged.

[0096] Whether it is the passive lubrication achieved by relying on the gravity effect under the above static conditions or the active lubrication process under the operating conditions, the lubricating medium input into the annular cavity 3 needs to be discharged in time after use, so as to take away debris and other impurities generated after the bearing 40 rotates, enabling the lubricating medium to form a better cycle and providing better lubrication protection for the bearing 40.

[0097] In this embodiment, an oil return passage 7 is connected between the annular cavity 3 and the second cavity 22. After the passive lubrication of the annular cavity 3 is achieved by the gravity effect using the oil supply passage 4, since debris impurities will be generated after the bearing 40 in the annular cavity 3 rotates, the used lubricating medium will return to the second cavity 22 through the oil return passage 7 and then be discharged from the outlet at the second cavity 22. Finally, the discharged part of the lubricating medium is filtered and processed to realize the recycling of the lubricating medium.

[0098] The main function of the oil drain hole 5 is to connect the second cavity 22 with the annular cavity 3, so that the used lubricating medium in the annular cavity 3 is guided back to the second cavity 22 through the oil drain hole 5 for discharge.

[0099] An embodiment of the present invention provides a gearbox 100. By providing an oil drain hole 5 at the second cavity 22 in the planetary shaft 20 and using an oil return channel 7 to communicate with the annular cavity 3, the lubricating medium in the annular cavity 3 is made to communicate with the second cavity 22, and the lubricating medium in the annular cavity 3 is recycled, preventing the accumulation of the lubricating medium in the annular cavity 3 and the failure of the lubricating medium caused by excessive impurities. By recycling, the effectiveness of the lubricating medium is ensured, thereby providing a reliable lubrication guarantee for the bearing 40.

[0100] Optionally, the planetary shaft 20 has a plurality of oil drain holes 5, the plurality of oil drain holes 5 are arranged at intervals in the circumferential direction of the second cavity 22, and a plurality of oil return channels 7 are provided in the planetary shaft 20, and each oil return channel 7 communicates with the second cavity 22 through the corresponding oil drain hole 5.

[0101] Optionally, in order to improve the circulation efficiency of the lubricating medium, a plurality of oil drain holes 5 and oil return channels 7 can be provided in the planetary shaft 20. Each oil drain hole 5 is spaced apart from each other on the surface of the planetary shaft 20 forming the storage cavity 2, so that the plurality of provided oil return channels 7 are respectively connected to their respective oil drain holes 5, realizing multi-point conduction between the annular cavity 3 and the storage cavity 2.

[0102] Optionally, the oil drain holes 5 are evenly distributed with respect to each other, so that the plurality of oil return channels 7 can evenly introduce the lubricating medium from the annular cavity 3 into the storage cavity 2, and at the same time can accelerate the circulation efficiency of the lubricating medium.

[0103] An embodiment of the present invention provides a gearbox 100. By providing a plurality of oil drain holes 5 and oil return channels 7 in the planetary shaft 20, conduction can be carried out using the plurality of oil return channels 7, so that the lubricating medium in the annular cavity 3 is discharged more efficiently through the oil drain holes 5, accelerating the circulation process of the lubricating medium, and being more conducive to the effective lubrication of the bearing 40.

[0104] As an optional embodiment, the second cavity 22 includes a first sub-cavity 22a and a second sub-cavity 22b that communicate with each other. The second sub-cavity 22b is connected to the side of the first sub-cavity 22a facing away from the first cavity 22a. The radial dimension of the second sub-cavity 22b is larger than the radial dimension of the first sub-cavity 22a. The lubricating medium flowing through the first sub-cavity 22a enters the second sub-cavity 22b and is discharged through the outlet.

[0105] The second sub-cavity 22b mainly functions to discharge the lubricating medium. The lubricating medium is discharged from the second sub-cavity 22b after flowing through the first cavity 21 and the first sub-cavity 22a and the second sub-cavity 22b in the second cavity 22 in sequence. Specifically, a part of the lubricating medium entering the first cavity 21 flows into the annular cavity 3 through the oil supply channel 4, and another part enters the first sub-cavity 22a and the second sub-cavity 22b of the second cavity 22.

[0106] Meanwhile, after the lubricating medium that returns from the annular cavity 3 to the second cavity 22 through the oil drain hole 5 carries impurities and enters the first sub-cavity 22a, it flows into the second sub-cavity 22b together and is discharged. This is because the flow rate of the lubricating medium increases after converging at the oil drain port. Therefore, by setting the large size of the second sub-cavity 22b, the discharge of the lubricating medium and impurities can be accelerated, and the second sub-cavity 22b has a greater capacity for accommodating the lubricating medium.

[0107] An embodiment of the present invention provides a gearbox 100. By setting the second cavity 22 as a communicating structure of the first sub-cavity 22a and the second sub-cavity 22b, not only can the flow rate of the lubricating medium be slowed down between the first cavity 21 and the second cavity 22 to ensure the flow rate entering the annular cavity 3, but also the discharge of the lubricating medium and impurities can be accelerated at the position where it enters the second sub-cavity 22b, thereby improving the circulation efficiency of the lubricating medium and meeting the flow rate requirements at different positions.

[0108] As an alternative embodiment, please refer to Figure 8 , an oil transmission channel 6 is provided on the planetary shaft 20. The oil transmission channel 6 and the oil supply channel 4 are distributed at intervals. One end of the oil transmission channel 6 is communicated with the oil sump and the other end is communicated with the annular cavity 3. The oil transmission channel 6 is configured to transmit the lubricating medium driven by the oil pump.

[0109] Optionally, the oil transmission channel 6 can be simultaneously provided on the planetary shaft 20. The so-called oil transmission channel 6 can be understood as an active lubrication channel, that is, an oil transmission channel for transmitting the lubricating medium after being driven by an external oil pump.

[0110] When the external oil pump operates, the oil pump drives the lubricating medium to flow and transmits it to the annular cavity 3 through the oil transmission channel 6, thereby realizing the active lubrication of the bearing 40.

[0111] An embodiment of the present invention provides a gearbox 100. By providing the oil transmission channel 6 on the planetary shaft 20, the overall structure simultaneously has the ability of active lubrication and passive lubrication of the bearing 40, meets the lubrication of the bearing 40 under the operating and stationary conditions of the gearbox 100, and has a more sufficient lubrication protection performance for the bearing 40.

[0112] An embodiment of the present invention provides a wind power generating set, including the gearbox 100 as described above.

[0113] An embodiment of the present invention provides a gearbox and a wind power generating set. By arranging a storage cavity and an oil supply channel on the planetary shaft, and arranging an oil inlet hole corresponding to the inlet of the storage cavity on the planetary carrier, the lubricating oil is injected into the storage cavity through the oil inlet hole. By connecting the storage cavity and the annular cavity where the bearing is located through the oil supply channel, the lubricating oil in the storage cavity flows into the annular cavity under the action of gravity through the oil supply channel, thereby realizing the lubrication of the bearing in a stationary state. The eccentric setting of the inlet of the storage cavity and the oil inlet hole can also prevent the reverse flow and discharge of the lubricating oil, enabling the lubricating oil to better drain into the annular cavity from the oil supply channel under the action of gravity, passively lubricating the bearing therein, improving the lubrication ability of the bearing in a stationary state, forming better lubrication protection for the bearing, improving the safety performance of the bearing when stationary, and avoiding adverse situations such as the failure of the bearing.

[0114] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A gearbox (100) includes a planetary carrier, a planetary shaft (20), planetary gears (30), and bearings (40). The planetary carrier includes a connecting shaft and a mounting bracket (10); the planetary shaft (20) is disposed on the mounting bracket (10); the planetary gears (30) are sleeved on the outer periphery of the planetary shaft (20), and an annular cavity (3) is formed between the planetary gears (30) and the planetary shaft (20); the bearings (40) are disposed in the annular cavity (3), and the bearings (40) are arranged around the planetary shaft (20) and are in rotational cooperation with the planetary gears (30). Characterized in that, a storage cavity (2) is provided on the planetary shaft (20), the storage cavity (2) axially penetrates the planetary shaft (20) along the axial direction of the planetary shaft (20) and has an inlet and an outlet at both ends in the axial direction, and the storage cavity (2) is configured to hold a lubricating medium; the mounting bracket (10) is provided with an oil inlet hole (1) corresponding to the inlet, the oil inlet hole (1) is correspondingly arranged and communicated with the inlet in the axial direction, and the inlet and the oil inlet hole (1) are eccentrically arranged in the radial direction of the planetary shaft (20); an oil supply channel (4) is provided in the planetary shaft (20), one end of the oil supply channel (4) is communicated with the storage cavity (2) and the other end is communicated with the annular cavity (3), and the lubricating medium in the storage cavity (2) can flow into the annular cavity (3) through the oil supply channel (4) by the action of gravity.

2. The gearbox (100) according to claim 1, Characterized in that, the gearbox (100) includes a positioning pin (50), the positioning pin (50) is connected between the planetary shaft (20) and the mounting bracket (10), and the minimum perpendicular distance from the positioning pin (50) to the axis of the connecting shaft is less than the minimum perpendicular distance from the oil inlet hole (1) to the axis; the number of the oil inlet holes (1) is multiple and they are distributed along a first pitch circle around the axis, the number of the positioning pins (50) is multiple and they are distributed along a second pitch circle around the axis, and the radial dimension of the first pitch circle is larger than the radial dimension of the second pitch circle.

3. The gearbox (100) according to claim 1, Characterized in that, in the axial direction of the planetary shaft (20), the orthographic projection of the oil inlet hole (1) and the orthographic projection of the inlet of the storage cavity (2) at least partially overlap, and the radial dimension of the oil inlet hole (1) is smaller than the radial dimension of the inlet.

4. The gearbox (100) according to claim 3, Characterized in that, the orthographic projection of the oil inlet hole (1) in the axial direction is located within the orthographic projection of the inlet.

5. The gearbox (100) according to claim 1, Characterized in that, the inlet of the storage cavity (2) is a circular opening, the oil inlet hole (1) is a circular hole, and the center distance between the orthographic projection of the inlet in the axial direction of the planetary shaft (20) and the orthographic projection of the oil inlet hole (1) is 30 - 50 mm.

6. The gearbox (100) according to claim 1, Characterized in that, The oil supply passage (4) comprises a plurality of oil supply branches, one end of each of the oil supply branches is connected to the storage chamber (2) and the other end is connected to the annular chamber (3), and the ports of the plurality of oil supply branches connected to the annular chamber (3) are spaced apart along the axial direction.

7. The gearbox (100) according to claim 6, It is characterized in that The plurality of oil supply branches include a first branch (41) and a second branch (42), wherein the first branch (41) extends in the radial direction of the planetary shaft (20), and the second branch (42) includes a first portion (4a) and a second portion (4b) connected to each other, wherein the first portion (4a) extends in the axial direction of the planetary shaft (20) and the second portion (4b) extends in the radial direction, the second branch (42) is connected to the storage chamber (2) through the first portion (4a) and is connected to the annular chamber (3) through the second portion (4b), and the second branch (42) is arranged on a side of the storage chamber (2) close to the connecting shaft in the radial direction.

8. The gearbox (100) according to any one of claims 1 to 7, It is characterized in that The storage cavity (2) comprises a first cavity (21) and a second cavity (22) which are interconnected, the radial dimension of the first cavity (21) being larger than the radial dimension of the second cavity (22) and a blocking wall being formed between the two, the inlet being formed in the first cavity (21), one end of the oil supply passage (4) being connected to the first cavity (21) and the other end being connected to the annular cavity (3), a portion of the lubricating medium in the first cavity (21) entering the oil supply passage (4) by gravity and another portion passing over the blocking wall and entering the second cavity (22).

9. The gearbox (100) according to claim 8, It is characterized in that The planetary shaft (20) is provided with an oil return channel (7) and an oil drain hole (5) located at the second cavity (22); one end of the oil return channel (7) is connected to the annular cavity (3) and the other end is connected to the oil drain hole (5) and is connected to the second cavity (22); the lubricating medium in the annular cavity (3) flows back to the second cavity (22) through the oil return channel (7) and is discharged.

10. The gearbox (100) according to claim 8, It is characterized in that The second cavity (22) comprises a first sub-cavity (22a) and a second sub-cavity (22b) which are interconnected, the second sub-cavity (22b) being connected to a side of the first sub-cavity (22a) facing away from the first cavity (21), the radial dimension of the second sub-cavity (22b) being larger than the radial dimension of the first sub-cavity (22a), and the lubricating medium flowing through the first sub-cavity (22a) enters the second sub-cavity (22b) and is then discharged.

11. The gearbox (100) according to claim 1, It is characterized in that An oil delivery channel (6) is provided on the planetary shaft (20), the oil delivery channel (6) and the oil supply channel (4) are spaced apart, one end of the oil delivery channel (6) communicates with the oil sump and the other end communicates with the annular cavity (3), and the oil delivery channel (6) is configured to transmit a lubricating medium driven by an oil pump.

12. A wind power generating set, characterized in that it includes a gearbox (100) according to any one of claims 1 to 11.

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