Wind power yawing and pitch changing device

Abstract

The utility model provides a wind power yawing and variable pitch device which can solve the problems that in the prior art, a yawing and variable pitch device cannot be used universally, is complex in structure, high in production cost and difficult to install and maintain, or cannot achieve compact structure and large-torque output at the same time, the load uniformity of a last-stage planet wheel is poor, and the interchangeability of the first-stage planet wheel and the second-stage planet wheel is poor. The device comprises a motor, a planetary reducer and an output gear, the planetary reducer comprises a front shell, a rear shell and a rear cover, one end of the front shell is connected with a motor shell, the other end of the front shell is rotatably connected with the other end of the rear shell through a bearing, a first-stage inner gear ring and a second-stage inner gear ring are arranged on the inner wall of one end of the front shell, and a first-stage planet row and a second-stage planet row are arranged on the inner side of one end of the front shell; a third-level inner gear ring is arranged on the inner wall of one end of the rear shell, a third-level planet row is arranged on the inner side, and the inner diameter of the third-level inner gear ring is larger than that of the first-level inner gear ring and that of the second-level inner gear ring. Each stage of planet row comprises a planet carrier, a planet shaft, a sun gear and a planet gear, and each stage of planet gear is correspondingly meshed with each stage of inner gear ring.

Description

Technical Field

[0001] The utility model relates to a driving device of a wind power generator, in particular to a wind power yaw and pitch changing device. Background Art

[0002] The yaw and pitch device are important components of the wind turbine generator set. The yaw device is mainly used to adjust the wind direction of the nacelle, and the pitch device is mainly used to adjust the windward angle of the blades, thereby improving the power generation efficiency of wind power. In the prior art, the yaw device is composed of a yaw motor, a yaw planetary reducer, a yaw output gear and a yaw ring gear. The yaw motor is connected to the input end of the yaw planetary reducer, the yaw output gear is connected to the output end of the yaw planetary reducer, and the yaw output gear is meshed with the yaw ring gear. The pitch device is composed of a pitch motor, a pitch planetary reducer, a pitch output gear and a blade bearing ring gear. The pitch motor is connected to the input end of the pitch planetary reducer, the pitch output gear is connected to the output end of the pitch planetary reducer, and the pitch output gear is meshed with the blade bearing ring gear. Due to the different structures of the yaw planetary reducer and the pitch planetary reducer, they cannot be interchanged when used, which leads to the yaw device and the pitch device being incompatible. Moreover, yaw planetary reducers and variable pitch planetary reducers are generally composed of 3 to 4 stages of planetary gears. Each stage of planetary gear needs to be designed, developed, processed, manufactured, assembled, verified and tested separately. The development cycle is long, the production and operation costs are high, and it is not convenient to install and maintain.

[0003] Chinese patent CN114673777A discloses a yaw planetary reduction motor for wind turbines. The reduction motor axially positions the planetary gear of the first-stage planetary gear reduction mechanism through the connecting flange of the motor, axially positions the planetary gear bearings of the current-stage planetary carrier, and axially positions the planetary carrier of the previous stage through the first external tooth of the next-stage sun gear, and is designed with a micro-gap with the next-stage planetary gear. At the same time, the planetary gear and the planetary carrier of the same stage are in direct contact to achieve mutual axial positioning; the planetary carrier of the N-stage planetary gear reduction mechanism is fixedly connected to the output gear to achieve power output. The overall axial dimension of the prior art is relatively small, which is suitable for scenes with strict spatial dimension requirements and reduces manufacturing costs. However, the prior art has the following problems: First, it is impossible to achieve compact structure and high torque power output at the same time; second, the output power of the last-stage planetary carrier causes centrifugal force on the planetary gear, and the load-sharing performance is poor; third, the interchangeability of the first two stages of planetary gears is poor. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problems in the prior art that the yaw device and the pitch device are not interchangeable, have a complex structure, a high production cost, are inconvenient to install and maintain, or cannot simultaneously achieve a compact structure and a large torque power output, the last stage of the planetary gear has centrifugal force resulting in poor load-sharing performance, and the first two stages of the planetary gears have poor interchangeability, and to provide a wind power yaw and pitch device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A wind power yaw and pitch device, comprising a motor, a planetary reducer, and an output gear; the special features thereof are:

[0007] The planetary reducer comprises a front shell, a rear shell, and a rear cover connected to one end of the rear shell; one end of the front shell is connected to the housing of the motor, and the other end is rotatably connected to the other end of the rear shell through a bearing; the output gear is connected to the rear cover through a spline; the inner wall of one end of the front shell is provided with a primary inner gear ring and a secondary inner gear ring in the axial direction from the outside to the inside, and a primary planetary gear row and a secondary planetary gear row are provided in the inner side in the axial direction; the inner wall of one end of the rear shell is provided with a third inner gear ring in the circumferential direction, and a third planetary gear row is provided on the inner side; the inner diameter of the third inner gear ring is larger than the inner diameter of the primary inner gear ring and the secondary inner gear ring;

[0008] The primary planetary gear comprises a primary planet carrier, at least three primary planetary shafts arranged on the primary planet carrier, a primary sun gear splined to the output shaft of the motor, and a primary planetary gear rotatably connected to the primary planetary shaft and meshing around the primary sun gear; the primary planetary gear meshes with the primary inner gear ring; the secondary planetary gear comprises a secondary planet carrier, at least three secondary planetary shafts arranged on the secondary planet carrier, a secondary sun gear splined to the inner end of the primary planet carrier, and a secondary planetary gear rotatably connected to the secondary planetary shaft and meshing around the secondary sun gear; The secondary planetary gear is meshed with the secondary inner gear ring; the third-stage planetary row includes a third-stage planetary carrier, a third-stage sun gear, at least three third-stage planetary shafts arranged on the third-stage planetary carrier, and a third-stage planetary gear rotatably connected to the third-stage planetary shaft; one end of the third-stage sun gear is spline-connected to the inner end of the secondary planetary carrier; the third-stage planetary carrier is sleeved on the outside of the third-stage sun gear, and the outer wall of one end away from the third-stage planetary shaft is spline-connected to the inner wall of the other end of the front shell, and the end face is fixedly connected to the inner wall of the other end of the front shell; the third-stage planetary gear is meshed with the third-stage sun gear and the third-stage inner gear ring.

[0009] Furthermore, the bearing includes a first bearing; a shaft sleeve is provided on the outer wall of the other end of the front shell, and an oil seal is provided on the outer wall of the shaft sleeve; the other end of the rear shell is rotatably connected to the other end of the front shell through the first bearing, and the first bearing is limited to the shaft sleeve; the outer wall of the oil seal is in sealing contact with the inner wall of the other end of the rear shell.

[0010] Furthermore, the bearing also includes a second bearing; a limit platform is provided on the inner wall of the other end of the rear shell; the other end of the rear shell is rotatably connected to the other end of the front shell through the first bearing and the second bearing, and the first bearing is limited between the sleeve and the limit platform; the second bearing is limited to the side of the limit platform away from the sleeve.

[0011] Furthermore, the first-stage sun gear and the second-stage sun gear, and the second-stage sun gear and one end of the third-stage sun gear are respectively connected via a third bearing.

[0012] Furthermore, the modules, pressure angles and numbers of teeth of the primary internal gear ring and the secondary internal gear ring are all the same.

[0013] Furthermore, the number of the first-stage planetary shafts and the number of the second-stage planetary shafts are both four; the number of the third-stage planetary shafts is three; the gear parameters of the first-stage planetary wheels and the second-stage planetary wheels are the same; the gear parameters of the first-stage sun wheels and the second-stage sun wheels are the same; and the spline parameters of the first-stage planet carrier and the second-stage planet carrier are the same.

[0014] Furthermore, the first bearing and the second bearing are both tapered roller bearings; and the third bearing is a deep groove ball bearing.

[0015] Beneficial effects of the utility model:

[0016] 1. The utility model provides a wind power yaw and pitch device with a compact structure. It can be used as a yaw device to adjust the windward direction of the cabin, and can also be used as a pitch device to adjust the windward angle of the blades. It can be interchanged when used, has good versatility, a short development cycle, low production and operating costs, and is easy to replace, install and maintain. Since the first and second level inner gear rings are integrated on the front shell, the gear manufacturing process can be completed at the same time. In addition, the utility model realizes high torque power output through the three-level inner gear ring. Since the three-level planetary frame is fixed, there is no centrifugal force on the planetary gear, and the load-sharing performance is good.

[0017] 2. Under the synergistic effect of the first bearing and the second bearing, the support stability between the front shell and the rear shell is significantly improved. By setting the third bearing, the end faces of the first-stage sun gear, the second-stage sun gear, and the third-stage sun gear can be positioned and supported to prevent the first-stage sun gear, the second-stage sun gear, and the third-stage sun gear from axial movement or swinging when subjected to force, which affects the stability of the system power transmission.

[0018] 3. In the utility model, the module, pressure angle and number of teeth of the primary inner gear ring and the secondary inner gear ring are the same, the gear parameters of the primary planetary gear and the secondary planetary gear are the same, and the gear parameters of the primary sun gear and the secondary sun gear are the same, which further shortens the product development cycle and reduces production costs. In addition, the gear parameters of the primary planetary gear and the secondary planetary gear are the same, the interchangeability is good, and it is easy to replace when failure or damage occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a wind power yaw and pitch device of the utility model;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the planetary reducer in the utility model (the rear cover is not shown);

[0021] Figure 3 yes Figure 2 A schematic diagram of a half-section three-dimensional structure;

[0022] Figure 4 It is a half-cut three-dimensional structural schematic diagram of the front shell in the utility model;

[0023] Figure 5 It is a half-section three-dimensional structural schematic diagram of a first-stage planetary gear in the utility model (the first-stage sun gear is not shown);

[0024] Figure 6 It is a half-section three-dimensional structural schematic diagram of the rear shell of the utility model.

[0025] Description of reference numerals:

[0026] 1-motor, 2-planetary reducer, 20-front housing, 21-rear housing, 22-rear cover, 3-output gear, 4-sleeve, 5-oil seal, 6-first bearing, 7-first-stage inner gear ring, 8-first-stage planetary row, 80-first-stage planetary carrier, 81-first-stage sun gear, 82-first-stage planetary gear, 83-first-stage planetary shaft, 9-secondary planetary row, 90-secondary planetary carrier, 91-secondary sun gear, 92-secondary planetary gear, 93-secondary planetary shaft, 10-secondary inner gear ring, 11-third-stage inner gear ring, 12-third-stage planetary row, 13-third-stage planetary carrier, 14-third-stage sun gear, 15-third-stage planetary shaft, 16-third-stage planetary gear, 17-limiting table, 18-second bearing, 19-third bearing, 23-elastic retaining ring, 24-needle roller bearing. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1-Figure 6As shown, a wind power yaw and pitch device includes a motor 1, a planetary reducer 2, and an output gear 3. Specifically, the planetary reducer 2 includes a front shell 20, a rear shell 21, and a rear cover 22 connected to one end of the rear shell 21 by bolts, wherein one end of the front shell 20 is connected to the housing of the motor 1, and the outer wall of the other end is sleeved with a shaft sleeve 4, and the outer wall of the shaft sleeve 4 is sleeved with an oil seal 5, and the inner wall of the other end of the rear shell 21 is provided with a limit platform 17, and the other end of the rear shell 21 is rotatably connected to the other end of the front shell 20 through a first bearing 6 and a second bearing 18, and the first bearing 6 is limited between the shaft sleeve 4 and the limit platform 17, and the second bearing 18 is limited to the side of the limit platform 17 away from the shaft sleeve 4, and the outer wall of the oil seal 5 is in sealing contact with the inner wall of the other end of the rear shell 21. In this embodiment, the first bearing 6 and the second bearing 18 are both tapered roller bearings. The output gear 3 is connected to the rear cover 22 by splines. The inner wall of one end of the front shell 20 is circumferentially provided with a primary internal gear ring 7 and a secondary internal gear ring 10 from the outside to the inside in the axial direction, and the inner side is axially provided with a primary planetary gear row 8 and a secondary planetary gear row 9 in sequence. The inner wall of one end of the rear shell 21 is circumferentially provided with a third-stage internal gear ring 11, and the inner side is provided with a third-stage planetary gear row 12. The inner diameter of the third-stage internal gear ring 11 is larger than the inner diameter of the primary internal gear ring 7 and the secondary internal gear ring 10. In the present embodiment, the module, pressure angle and number of teeth of the primary internal gear ring 7 and the secondary internal gear ring 10 are the same. The primary planetary gear 8 comprises a primary planetary carrier 80, four primary planetary shafts 83 arranged on the primary planetary carrier 80, four primary planetary gears 82, and a primary sun gear 81 spline-connected to the output shaft of the motor 1, wherein elastic retaining rings 23 are arranged on the inner sides of both ends of each primary planetary gear 82, the four primary planetary gears 82 are rotatably connected to the four primary planetary shafts 83 through needle bearings 24, respectively, the elastic retaining rings 23 axially position the needle bearings 24, and the four primary planetary gears 82 mesh around the primary sun gear 81 and mesh with the primary inner gear ring 7. The secondary planetary gear 9 comprises a secondary planetary carrier 90, four secondary planetary shafts 93 arranged on the secondary planetary carrier 90, four secondary planetary gears 92, and a secondary sun gear 91 spline-connected to the inner end of the primary planetary carrier 80, the connection mode of the secondary planetary gear 92 and the secondary planetary shaft 93 is the same as the connection mode of the primary planetary gear 82 and the primary planetary shaft 83, and the four secondary planetary gears 92 mesh around the secondary sun gear 91 and mesh with the secondary inner gear ring 10.The three-stage planetary gear 12 includes a three-stage planet carrier 13, a three-stage sun gear 14, three three-stage planetary shafts 15 arranged on the three-stage planet carrier 13, and three three-stage planetary gears 16. The connection mode between the three-stage planetary gear 16 and the three-stage planetary shaft 15 is the same as the connection mode between the first-stage planetary gear 82 and the first-stage planetary shaft 83. One end of the three-stage sun gear 14 is connected to the inner end of the second-stage planet carrier 90 by splines. The three-stage planet carrier 13 is sleeved on the outside of the three-stage sun gear 14, and the outer wall of one end away from the three-stage planetary shaft 15 is splined to the inner wall of the other end of the front shell 20. The end face of the end is fixed to the inner wall of the other end of the front shell 20 by bolts. The three three-stage planetary gears 16 are meshed with the three-stage sun gear 14 and the three-stage inner gear ring 11. The first-stage sun gear 81 and the second-stage sun gear 91, and the second-stage sun gear 91 and one end of the three-stage sun gear 14 are rotatably connected by a third bearing 19 respectively. In this embodiment, the third bearing 19 is a deep groove ball bearing, the gear parameters of the first-stage planetary gear 82 and the second-stage planetary gear 92 are the same, the gear parameters of the first-stage sun gear 81 and the second-stage sun gear 91 are the same, and the spline parameters of the first-stage planetary carrier 80 and the second-stage planetary carrier 90 are the same.

[0029] The working principle of the utility model is as follows:

[0030] The motor 1 inputs power to the primary sun gear 81 through the output shaft, and the primary sun gear 81 drives the primary planetary gear 82, so that the primary planetary gear 82 rotates and revolves around the primary sun gear 81 at the same time, and the revolution of the primary planetary gear 82 drives the primary planetary carrier 80 to rotate around the central axis of the primary sun gear 81, and the primary sun gear 81 and the primary planetary carrier 80 input power to the secondary sun gear 91, and the secondary sun gear 91 drives the secondary planetary gear 92, so that the secondary planetary gear 92 rotates and revolves around the secondary sun gear 91 at the same time. The revolution of the secondary planetary gear 92 drives the secondary planetary carrier 90 to rotate around the central axis of the secondary sun gear 91. The secondary sun gear 91 and the secondary planetary carrier 90 input power to the tertiary sun gear 14. The tertiary sun gear 14 drives the tertiary planetary gear 16. The tertiary planetary gear 16 drives the rear shell 21 to rotate around the front shell 20. The rear cover 22 connected to the rear shell 21 drives the output gear 3 to rotate. The output gear 3 drives the external yaw or pitch gear ring to achieve power output, thereby realizing the direction of the generator cabin to the wind or adjusting the windward angle of the blades.

[0031] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or replacements within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A wind turbine yaw and pitch device, comprising a motor (1), a planetary reducer (2), and an output gear (3); characterized in that: The planetary reducer (2) comprises a front shell (20), a rear shell (21), and a rear cover (22) connected to one end of the rear shell (21); one end of the front shell (20) is connected to the housing of the motor (1), and the other end is rotatably connected to the other end of the rear shell (21) via a bearing; the output gear (3) is connected to the rear cover (22) via a spline; the inner wall of one end of the front shell (20) is provided with a primary inner gear ring (7) and a secondary inner gear ring (10) in the axial direction from the outside to the inside, and a primary planetary gear row (8) and a secondary planetary gear row (9) are provided in sequence on the inner side in the axial direction; the inner wall of one end of the rear shell (21) is provided with a third inner gear ring (11) in the circumferential direction, and a third planetary gear row (12) is provided on the inner side; the inner diameter of the third inner gear ring (11) is greater than the inner diameters of the primary inner gear ring (7) and the secondary inner gear ring (10); The primary planetary gear (8) comprises a primary planetary carrier (80), at least three primary planetary shafts (83) arranged on the primary planetary carrier (80), a primary sun gear (81) spline-connected to the output shaft of the motor (1), and a primary planetary gear (82) rotatably connected to the primary planetary shaft (83) and meshing around the primary sun gear (81); the primary planetary gear (82) meshes with the primary inner gear ring (7); the secondary planetary gear (9) comprises a secondary planetary carrier (90), at least three secondary planetary shafts (93) arranged on the secondary planetary carrier (90), a secondary sun gear (91) spline-connected to the inner end of the primary planetary carrier (80), and a secondary planetary gear (92) rotatably connected to the secondary planetary shaft (93) and meshing around the secondary sun gear (91); The secondary planetary gear (92) is meshed with the secondary inner gear ring (10); the tertiary planetary gear (12) comprises a tertiary planetary carrier (13), a tertiary sun gear (14), at least three tertiary planetary shafts (15) arranged on the tertiary planetary carrier (13), and a tertiary planetary gear (16) rotatably connected to the tertiary planetary shafts (15); one end of the tertiary sun gear (14) is spline-connected to the inner end of the secondary planetary carrier (90); the tertiary planetary carrier (13) is sleeved on the outer side of the tertiary sun gear (14), and the outer wall of one end away from the tertiary planetary shaft (15) is spline-connected to the inner wall of the other end of the front shell (20), and the end face is fixedly connected to the inner wall of the other end of the front shell (20); the tertiary planetary gear (16) is meshed with the tertiary sun gear (14), and is meshed with the tertiary inner gear ring (11).

2. A wind turbine yaw and pitch device according to claim 1, characterized in that: The bearing comprises a first bearing (6); a shaft sleeve (4) is sleeved on the outer wall of the other end of the front shell (20), and an oil seal (5) is sleeved on the outer wall of the shaft sleeve (4); the other end of the rear shell (21) is rotatably connected to the other end of the front shell (20) through the first bearing (6), and the first bearing (6) is limited to the shaft sleeve (4); the outer wall of the oil seal (5) is in sealing contact with the inner wall of the other end of the rear shell (21).

3. A wind turbine yaw and pitch device according to claim 2, characterized in that: The bearing further comprises a second bearing (18); a limiting platform (17) is provided on the inner wall of the other end of the rear shell (21); the other end of the rear shell (21) is rotatably connected to the other end of the front shell (20) via the first bearing (6) and the second bearing (18), and the first bearing (6) is limited between the shaft sleeve (4) and the limiting platform (17); the second bearing (18) is limited on the side of the limiting platform (17) away from the shaft sleeve (4).

4. A wind turbine yaw and pitch device according to any one of claims 1 to 3, characterized in that: The first-stage sun gear (81) and the second-stage sun gear (91), and the second-stage sun gear (91) and one end of the third-stage sun gear (14) are respectively connected via a third bearing (19).

5. A wind turbine yaw and pitch device according to claim 4, characterized in that: The modules, pressure angles and numbers of teeth of the primary internal gear ring (7) and the secondary internal gear ring (10) are all the same.

6. A wind turbine yaw and pitch device according to claim 5, characterized in that: The number of the first-stage planetary shafts (83) and the number of the second-stage planetary shafts (93) are both four; the number of the third-stage planetary shafts (15) is three; the gear parameters of the first-stage planetary gear (82) and the second-stage planetary gear (92) are the same; the gear parameters of the first-stage sun gear (81) and the second-stage sun gear (91) are the same; the spline parameters of the first-stage planetary carrier (80) and the second-stage planetary carrier (90) are the same; and the third bearing (19) is a deep groove ball bearing.

7. A wind turbine yaw and pitch device according to claim 3, characterized in that: The first bearing (6) and the second bearing (18) are both tapered roller bearings.

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