Reliable wind power gear box planet wheel bearing lubricating structure

Abstract

The utility model provides a reliable wind power gear box planet wheel bearing lubricating structure which is characterized in that an annular baffle is arranged in an inner hole of a distance ring, the outer circle of the baffle is fixed to the inner wall of the inner hole of the distance ring, and two oil cavities are formed in the two sides of the baffle; two rows of oil holes penetrating through the side wall of the space ring are formed in the two sides, corresponding to the baffles, of the space ring respectively, correspond to the two oil cavities respectively and communicate with an inner ring groove formed in the inner wall of the space ring. By means of the novel planet wheel bearing lubricating structure, the lubricating oil amount of the planet wheel bearing on the higher side is guaranteed, the risk that the planet wheel bearing on the higher side is damaged due to poor lubrication is reduced, and planet-level operation of the wind power gear box is more reliable.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine gearbox structure, specifically to a lubrication structure for planetary gear bearings in a wind turbine gearbox. Background Technology

[0002] When designing wind turbines, to prevent the blades from deforming and hitting the tower during operation, the nacelle where the drive train is installed is tilted at a certain angle. This means the wind turbine gearbox is installed at an angle within the airport. To ensure reliable operation of the wind turbine gearbox, lubricating oil is needed for lubrication and cooling of the internal gear meshing points and bearing positions.

[0003] Currently, in the planetary gearbox structure of wind turbines, two full complement cylindrical roller bearings are typically installed within each planetary gear. A spacer ring and a retaining ring are installed between the outer rings of the two planetary bearings. The retaining ring is installed in a groove within the planetary gear to prevent relative axial movement between the bearing and the planetary gear. The spacer ring and retaining ring are installed side-by-side to define the installation position of the bearing outer ring and the planetary gear. A spacer ring is installed between the two inner rings of the bearing to define the installation position of the inner ring and to allow lubricating oil to enter the bearing through grooves and holes on the spacer ring for lubrication. A pin is assembled with the bearing inner ring and the inner bore of the planetary carrier, fixing the bearing and planetary gear onto the planetary carrier. The pin has oil holes that connect to the oil passages of the wind turbine gearbox, allowing lubricating oil to enter between the two planetary bearings through the oil holes on the pin and the spacer ring for lubrication and cooling.

[0004] The technical solution of existing technology 1 is as follows:

[0005] Currently, in the planetary structure of wind turbine gearboxes, two full complement cylindrical roller bearings are generally installed inside the planetary gears. Between the two planetary bearings are components such as spacer rings, elastic retaining rings, and spacers. After all components are installed in place, a cavity is formed between the two planetary bearings. Lubricating oil enters the cavity through oil holes or oil grooves on each component to lubricate the two planetary bearings.

[0006] The disadvantages of existing technology 1 are:

[0007] Because wind turbine gearboxes are installed at a certain angle (i.e., the planetary gears are installed at a certain angle), and due to the structural characteristics of the gaps between the rollers of the planetary gear bearings, when lubricating oil enters the cavity between two planetary gears, it flows towards the lower side. Most of the lubricating oil enters the bearing on the lower side and flows out, making it difficult to ensure sufficient lubrication for the bearing on the higher side, which can easily lead to damage due to poor lubrication. Utility Model Content

[0008] This invention provides a reliable lubrication structure for planetary gear bearings in wind turbine gearboxes. Its purpose is to overcome the shortcomings of the prior art. Through the new planetary gear bearing lubrication structure, the lubrication amount of the planetary gear bearings on the higher side is ensured, reducing the risk of damage to the planetary gear bearings on the higher side due to poor lubrication, and making the planetary gear operation of wind turbine gearboxes more reliable.

[0009] The technical solution adopted by this utility model to solve its technical problem is:

[0010] A reliable lubrication structure for planetary gear bearings in a wind turbine gearbox includes two full complement cylindrical roller bearings housed within the planetary gears. A spacer ring and an elastic retainer ring are installed between the outer rings of the two bearings. The elastic retainer ring is installed in a groove on the inner wall of the planetary gear's shaft bore. The spacer ring and the elastic retainer ring are installed side-by-side. A spacer ring is installed between the inner rings of the two bearings. A pin is assembled with the inner rings of the two bearings and the inner bore of the planetary carrier. The pin has an oil hole communicating with the oil passage of the wind turbine gearbox. The oil hole on the spacer ring communicates with an internal annular groove on the inner wall of the spacer ring, and the internal annular groove on the inner wall of the spacer ring communicates with the oil hole on the pin. The structure is characterized by:

[0011] The inner hole of the spacer ring is provided with an annular baffle. The outer circle of the baffle is fixed to the inner wall of the inner hole of the spacer ring, forming two oil chambers on both sides of the baffle.

[0012] The spacer has two rows of oil holes on each side of the baffle, which penetrate the side wall of the spacer. The two rows of oil holes correspond to two oil chambers, and the two rows of oil holes are connected to the internal annular groove opened on the inner wall of the spacer.

[0013] The outer diameter of the spacer is smaller than the inner diameter of the baffle.

[0014] An annular groove is provided on the outer circle of the spacer, and a baffle is located at the middle position of the annular groove. The bottom diameter of the annular groove is smaller than the inner circle diameter of the baffle, and the width of the annular groove is greater than the width of the baffle.

[0015] Two rows of oil holes penetrating the sidewall of the spacer are located on both sides of the annular groove on the outer circle of the spacer.

[0016] The advantages of this utility model are:

[0017] 1. The new structure forms two oil chambers. Lubricating oil is sprayed into the oil chambers through two rows of oil holes on the spacer ring, which are responsible for the lubrication of the bearings on both sides, making the lubricating oil distribution of each bearing more even.

[0018] 2. The baffle structure between the two oil chambers prevents the lubricating oil of the high-side bearing from flowing to the low-side, ensuring that the high-side bearing is adequately lubricated.

[0019] 3. The outer diameter of the spacer and the design of the annular groove in the middle can ensure smooth assembly of parts, effective oil blocking, and prevent interference with wear during operation. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the present invention;

[0022] Figure 2 This is a sectional view of a fixed-distance ring;

[0023] Figure 3 This is a cross-sectional view of the spacer ring. Detailed Implementation

[0024] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort. To facilitate understanding of this utility model, a more detailed description of this utility model will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0025] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] like Figure 1 , Figure 2 , Figure 3 As shown:

[0027] This utility model provides a reliable lubrication structure for planetary gear bearings in wind turbine gearboxes.

[0028] Typically, two full complement cylindrical roller bearings are installed within the planetary gear set: bearing 31 on the higher side and bearing 32 on the lower side. A spacer ring 5 and a retaining ring 6 are installed between the outer rings of bearings 31 and 32. The retaining ring 6 is installed in a groove on the inner wall of the shaft bore of the planetary gear 4 to prevent axial relative movement between bearings 31 and 32 and the planetary gear 4. The spacer ring 5 and the retaining ring 6 are installed side by side to define the installation positions of the outer rings of bearings 31 and 32 and the planetary gear 4. A spacer ring 7 is installed between the inner rings of bearings 31 and 32 to define the installation positions of the inner rings of bearings 31 and 32, and allows lubricating oil to enter bearings 31 and 32 through grooves and holes provided on the spacer ring 7 for lubrication.

[0029] The pin 2 is assembled with the inner rings of bearings 31 and 32 and the inner bore of the planetary carrier 1, fixing bearings 31 and 32 and planetary gear 4 onto the planetary carrier 1. The pin 2 has an oil hole connected to the oil passage of the wind turbine gearbox. Lubricating oil enters between bearings 31 and 32 through the oil hole on the pin 2 and the spacer 7, providing lubrication and cooling to bearings 31 and 32.

[0030] The inner hole of the spacer ring 5 is provided with an annular baffle 501. The outer circle of the baffle 501 is fixed on the inner wall of the inner hole of the spacer ring 5. The diameter of the inner circle 502 of the baffle 501 is d1, and the width of the baffle 501 is h1. The diameter d1 of the inner circle 502 of the baffle 501 is designed according to the specific bearing model and gearbox tilt angle to ensure that the lubricating oil blocked by the body of the baffle 501 can provide sufficient lubrication to the bearing 31 on the higher side.

[0031] The outer diameter d2 of the spacer ring 7 is slightly smaller than the inner diameter d1 of the baffle 501, ensuring that all parts can be installed smoothly and that the baffle 501 can effectively block oil. An annular groove 701 with a bottom diameter d3 and a width h2 is provided on the outer circle of the spacer ring 7. After all parts are installed, the baffle 501 corresponds to the middle position of the annular groove 701. The bottom diameter d3 of the annular groove 701 is smaller than the inner diameter d1 of the baffle 501, and the width h2 of the annular groove 701 is larger than the width h1 of the baffle 501. This ensures that there is sufficient clearance between the spacer ring 5 and the spacer ring 7, ensuring that the two parts will not interfere with each other during planetary star operation, and that two oil chambers (oil chamber A and oil chamber B) can be formed on both sides of the baffle 5. The spacer 7 has two rows of oil holes (holes C and D) penetrating the sidewalls of the spacer 7 on both sides of the annular groove 701. Hole C corresponds to oil cavity A, and hole D corresponds to oil cavity B. The two rows of oil holes (holes C and D) connect to the internal annular groove 702 opened on the inner wall of the spacer 7. The internal annular groove 702 connects to the oil hole of the pin 2, ensuring smooth flow of lubricating oil. The lubricating oil passing through holes C and D flows into oil cavity A and oil cavity B respectively, lubricating the bearings 31 and 32 on both sides respectively. When the lubricating oil flowing into oil cavity A flows to the right (lower side), it is blocked by the body of the baffle 501, so that it can only flow to the left through the gap between the bearing rollers of the bearing 31 on the higher side, so that the bearing 31 on the higher side is fully lubricated. Figure 1 The middle arrow indicates the direction of lubricating oil flow.

[0032] This utility model patent presents a reliable lubrication structure for planetary gear bearings in wind turbine gearboxes. It features a simple structure, convenient operation, and requires no adjustment to other mating components. Based on the original spacer ring structure, a baffle structure is added to the inner hole of the spacer ring. The diameter of the baffle's inner hole is designed according to the specific bearing model and gearbox tilt angle. Based on the original spacer ring, an annular groove is set on the outer circle of the spacer ring, replacing the oil holes on the spacer ring with two rows of oil holes located on both sides of the annular groove. The diameter of the baffle's inner hole is slightly larger than the outer circle diameter of the inner spacer ring and larger than the diameter of the spacer ring groove. The width of the spacer ring baffle is smaller than the width of the spacer ring groove. The spacer ring baffle is located in the middle of the spacer ring groove, ensuring smooth installation of the parts and eliminating the risk of interference and wear during operation. The two oil chambers formed are responsible for lubricating the bearings on both sides respectively. The spacer ring baffle effectively prevents lubricating oil from flowing from the higher side to the lower side bearing before lubricating the higher side bearing, ensuring sufficient lubrication of the higher side bearing and making the planetary bearing operation more reliable.

[0033] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reliable lubrication structure for planetary gear bearings in a wind turbine gearbox, wherein the planetary gears of the wind turbine gearbox contain two full complement cylindrical roller bearings, a spacer ring and an elastic retainer ring are installed between the outer rings of the two bearings, the elastic retainer ring is installed in a groove on the inner wall of the planetary gear shaft bore, the spacer ring and the elastic retainer ring are installed side by side, and a spacer ring is installed between the inner rings of the two bearings; a pin is assembled with the inner rings of the two bearings and the inner bore of the planetary carrier, the pin is provided with an oil hole communicating with the oil passage of the wind turbine gearbox, the oil hole provided on the spacer ring communicates with the internal annular groove opened in the inner wall of the spacer ring, and the internal annular groove opened in the inner wall of the spacer ring communicates with the oil hole of the pin; characterized in that: The inner hole of the spacer ring is provided with an annular baffle. The outer circle of the baffle is fixed to the inner wall of the inner hole of the spacer ring, forming two oil chambers on both sides of the baffle. The spacer has two rows of oil holes on each side of the baffle, which penetrate the side wall of the spacer. The two rows of oil holes correspond to two oil chambers, and the two rows of oil holes are connected to the internal annular groove opened on the inner wall of the spacer.

2. The reliable lubrication structure for planetary gear bearings in a wind turbine gearbox as described in claim 1, characterized in that: The outer diameter of the spacer is smaller than the inner diameter of the baffle.

3. The reliable lubrication structure for planetary gear bearings in a wind turbine gearbox as described in claim 1, characterized in that: An annular groove is provided on the outer circle of the spacer, and a baffle is located at the middle position of the annular groove. The bottom diameter of the annular groove is smaller than the inner circle diameter of the baffle, and the width of the annular groove is greater than the width of the baffle.

4. The reliable lubrication structure for planetary gear bearings in a wind turbine gearbox as described in claim 3, characterized in that: Two rows of oil holes penetrating the sidewall of the spacer are located on both sides of the annular groove on the outer circle of the spacer.

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