CN101649816A - Wind-power generating yaw speed reducer - Google Patents

Abstract

The invention relates to a yaw speed reducer of a wind power generator. Four-stage satellite transmission structures are arranged in a box and are connected with each other to be transmitted to an output gear shaft in sequence; a motor flange is connected to the upper end of the box; the output gear shaft is arranged in a support body through an upper bearing and a lower bearing and is sealed by an oil seal base; a first-stage internal gear ring is connected into the motor flange through bolts; a motor input connection sleeve is arranged in the motor flange through a bearing; the number of theinternal teeth of the motor input connection sleeve is the same as the number of the external teeth of a first-stage sun gear; and the internal teeth of the motor input connection sleeve and the external teeth of the first-stage sun gear have the same modulus and the same pressure angle of 20 degrees and are in mutual meshing transmission. The yaw speed reducer has compact structure, reasonable design, good uniform-loading effect, strong bearing and impact resistance capacity, good sealing performance and a uniformly-forced satellite gear meshed with the floating sun gear, is convenient to make and not easy to cause the environmental pollution and runs stably, thereby meeting the requirements of the clients.

Description

Wind power yaw reduction device

technical field

The invention relates to a deceleration device, in particular to a yaw deceleration device suitable for wind power generation.

Background technique

Wind power generator is a generator driven by wind power to rotate the generator. Due to the unpredictable size and direction of wind power, it is a kind of energy with strong randomness. The impact force generated by wind power has a high uncertainty factor. For the stable operation of the unit, the wind turbine must be equipped with a yaw reduction device with strong impact resistance and a large reduction ratio. Its function is to adjust the direction of the fan by driving the yaw ring gear to achieve full use of wind resources. Effect.

At present, most of the yaw gearboxes of wind turbines at home and abroad adopt multi-stage planetary gear reduction. Most of the motor input connection sleeve and the first-stage sun gear adopt rigid interference connection or spline connection. The rigid interference connection of the wheel, the first-stage sun gear cannot float, and the force of the planetary gear meshed with it is uneven, resulting in unbalanced load of the first-stage planetary structure, high noise, serious wear and tear of the first-stage sun gear, and low service life; The motor input connection sleeve is used to connect the first-stage sun gear with a spline. In order to reduce the volume, the spline needs to be processed by gear shaping, which requires high machining accuracy, difficult production, and high manufacturing costs. Most of the bearings installed on the first-stage planetary gear The use of ball bearings has a small load-carrying capacity, which affects the load-sharing capacity of the planetary structure; in addition, in the prior art, the internal ring gears of all levels can be assembled as part of the box body or processed and formed integrally in the box body when making the box body, and integrated in the box body When the inner ring gear is processed, the weight of the box increases, the processing is difficult, the material is wasted, and the structure is unreasonable.

In the wind turbine, the yaw variable speed gearbox is in an upright state, and the oil drain plug on the box body is used to drain oil. When used in a poor environment, the thread on the oil drain plug is easily damaged or the rubber ring is easy to fail, resulting in oil leakage. Causes environmental pollution; only a skeleton oil seal is used between the output shaft of the gearbox and the box body, and the axial sealing performance of the output shaft is guaranteed, but the sealing performance on the sealing end face is poor, and dust and impurities are easy to enter the box, which seriously affects the bearing life.

Contents of the invention

In order to solve the unreasonable structure of the wind power generation yaw reduction device in the prior art, when the motor input connection sleeve and the first-stage sun gear are connected by rigid interference, the first-stage planetary wheel will be unevenly stressed, which will easily lead to unbalanced load and large noise , serious wear, low service life, or when spline connection is used, the processing accuracy of the gear shaping spline is high, the production is difficult, and the manufacturing cost is high. The purpose of the present invention is to provide a compact structure and reasonable design. The inner teeth of the connecting sleeve and the outer teeth of the first-stage sun gear are meshed and connected to each other for transmission. The first-stage sun gear is formed at one time without secondary spline tooth processing, which is convenient to manufacture and low in production cost, and the force on the first-stage planetary gear is even , The wind power generation yaw reduction device with good load equalization effect, small wear and long service life.

The technical solution adopted in the present invention is: wind power generator yaw reduction device, including box body, motor input connection sleeve, sun gear, planetary gear, planet carrier, inner ring gear, output gear shaft, box body includes motor flange, upper Box body, middle box body, support body, oil seal seat, there is a four-stage planetary transmission structure in the box body, the second-stage internal gear ring is fixedly connected between the upper box body and the middle box body by bolts, and the third-stage internal gear The ring is fixedly connected between the middle box body and the support body by bolts, the first-stage planetary carrier is connected to the second-stage sun gear through splines, the second-stage planetary carrier is connected to the third-stage sun gear through splines, and the third-stage planetary carrier is connected to the third-stage sun gear through splines. The planetary carrier is connected to the fourth-stage sun gear through splines, and the fourth-stage planetary carrier is connected to the output gear shaft through splines; the output gear shaft is installed in the support body through bearings and sealed by the oil seal seat. Its technical feature is that the first The first-stage inner ring gear is connected to the motor flange by bolts, and the motor input connection sleeve is installed in the motor flange through the bearing; the motor input connection sleeve and the first-stage sun gear have the same modulus, the same number of teeth, and the pressure angle is 20° internal and external gear meshing transmission.

Two parallel skeleton oil seals are arranged between the upper and lower bearings on the output gear shaft; an end face sealing oil seal is arranged between the support body and the oil seal seat.

A quick release joint is provided on the side wall of the support body, and the quick release joint is located between the upper bearing on the output gear shaft and the skeleton oil seal.

The gears of the planetary structure at all levels adopt a tooth shape with a pressure angle of 25° and a head clearance coefficient of 0.4;

The planetary frames at all levels adopt a double-wall integral structure; the bearings used to install the planetary wheels on the first-stage planetary frames are cylindrical roller bearings, and the bearings used to install the planetary wheels on the other three-stage planetary frames are double-walled. Row needle roller bearings.

O-rings are provided on the connecting surfaces of the motor flange, the second-stage internal gear, the upper box, the third-stage internal gear, the middle box, the fourth-stage internal gear, and the supporting body.

After adopting above technical scheme, the beneficial effect that the present invention reaches is:

1. The motor input connection sleeve and the first-stage sun gear adopt the same module, the same number of teeth, and the pressure angle is 20°. The internal and external gear meshing transmission, the first-stage sun gear can float, and the planetary gear meshing with it is evenly stressed , the effect of load equalization is good, the wear of the first-stage sun gear is small, and the service life is long; and the first-stage sun gear is processed at one time, without the need for secondary spline tooth processing, which greatly shortens the processing cycle and reduces production costs;

2. The first-stage internal gear is connected to the flange of the motor through bolts, which solves the problems of heavy weight, difficult processing, and waste of materials when the traditional internal gear and the box are made together, and reduces the number of internal gears installed in the box. , which is beneficial to reduce the height and weight of the device, improve the overall strength of the device, and reduce production costs;

3. There are two parallel skeleton oil seals between the upper and lower bearings on the output gear shaft, and an end face seal oil seal is provided between the support body and the oil seal seat. When the yaw reduction device is in a vertical state, the end face seal cooperates with the skeleton oil seal , realize axial and radial sealing, high sealing performance, solve the problem of lubricating oil leakage, and prevent dust from entering and affecting the life of the bearing.

4. The bearings used to install the planetary wheels on the first-stage planetary carrier are cylindrical roller bearings, and the bearings used to install the planetary wheels on the other three-stage planetary carriers are double-row needle roller bearings. The bearings occupy a small space. Both adopt double-wall integral structure, and the load capacity of planetary mechanisms at all levels is improved; the gears of planetary structures at all levels adopt a tooth shape with a pressure angle of 25° and a head clearance coefficient of 0.4, and the loads on planetary gears at all levels are along the tooth width. The direction is evenly distributed, which is beneficial to improve the bearing capacity and impact resistance of the yaw deceleration device. The yaw deceleration device operates more stably, has less vibration and noise, and has a longer service life;

5. There is a quick-release joint on the side wall of the support body to replace the commonly used oil drain plug. When changing the lubricating oil, it is not easy to pollute the transmission device and peripheral devices, reduce environmental pollution, and meet environmental protection requirements; the motor flange, the second stage O-rings are provided on the connecting surfaces of the inner ring gear, the upper case, the third-stage inner ring gear, the middle case, the fourth-stage inner ring gear, and the support body, which ensures the high sealing performance of the transmission device.

The present invention adopts the same modulus, the same number of teeth, and the pressure angle is 20° to connect the motor input connection sleeve with the first-stage sun gear, and the planetary gear meshed with the floating sun gear is evenly stressed, and the load equalization effect is good, and The structure is compact, the design is reasonable, the production is convenient, the whole machine has strong bearing capacity and impact resistance, stable operation, good sealing performance, and is not easy to cause environmental pollution, meeting customer needs.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure: motor flange 1, upper box body 2, middle box body 3, support body 4, first-stage inner gear 5, second-stage inner gear 6, third-stage inner gear 7, fourth-stage inner gear Ring gear 8, first-stage planetary carrier 9, first-stage planetary gear 10, first-stage sun gear 11, second-stage planetary carrier 12, second-stage planetary gear 13, second-stage sun gear 14, third-stage planet Frame 15, third-stage planetary gear 16, third-stage sun gear 17, fourth-stage planetary carrier 18, fourth-stage planetary gear 19, fourth-stage sun gear 20, motor input connection sleeve 21, output gear shaft 22, skeleton Oil seal 23, bearing 24, planetary shaft 25, O-ring 26, quick release joint 27, oil seal seat 28, end face oil seal 29.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the yaw reduction device for wind power generation mainly includes: motor flange 1, upper box body 2, middle box body 3, support body 4, four-stage planetary transmission structure, input motor input connection sleeve 21, output gear shaft 22 , Oil seal seat 28. The motor flange 1 is provided with the input motor input connection sleeve 21 and the first-stage internal ring gear 5, the first-stage internal ring gear 5 is fixedly connected in the motor flange 1 by bolts, and the connection between the motor flange 1 and the upper box body 2 The second-stage internal gear ring 6 is fixedly connected by bolts, the third-stage internal gear ring 7 is fixedly connected between the upper box body 2 and the middle box body 3 by bolts, and the middle box body 3 and the support body 4 are fixedly connected by bolts The fourth-stage internal ring gear 8; the internal teeth of the input motor input connection sleeve 21 have the same modulus and the same number of teeth as the external teeth of the first-stage sun gear 11, the pressure angle is 20°, and the internal and external teeth are meshed with each other. The planet carrier 9 is connected to the second-stage sun gear 14 through splines, the second-stage planet carrier 12 is connected to the third-stage sun gear 17 through splines, and the third-stage planet carrier 15 is connected to the fourth-stage sun gear 20 through splines , the fourth-stage planet carrier 18 is connected to the output gear shaft 22 through a spline, the output gear shaft 22 is installed in the support body 4 through the bearing 24 and sealed by the oil seal seat 28, and the sealing end surface of the oil seal seat 28 and the support body 4 is provided with The end face oil seal 29, two skeleton oil seals 23 juxtaposed between the upper and lower bearings 24; the side wall of the support body 4 is provided with a quick release joint 27, and the quick release joint 27 is located between the motor end bearing and the skeleton oil seal 23; The frame adopts a double-wall integral structure. The gears of the planetary structure at all levels adopt a tooth shape with a pressure angle of 25° and a head clearance coefficient of 0.4. The bearings used to install the planetary gears on the first-stage planetary frame are cylindrical roller bearings. , the bearings used to install the planetary gears on the other three-stage planetary carriers are double-row needle roller bearings; the motor flange, the second-stage internal gear, the upper box, the third-stage internal gear, the middle box, and the fourth O-rings 26 are provided on the connection surfaces between the inner ring gear and the supporting body.

Before use, the yaw deceleration devices of three wind power generators are evenly arranged on the periphery of the turntable of the wind power generator base, and the three motor input connection sleeves 21 are equipped with servo motors, and the output gear shaft 22 is connected to the machine of the wind power generator. The ring gear provided around the seat turntable meshes. When the wind direction changes during use, the control circuit will start all the servo motors synchronously, and the servo motors will drive the first-stage sun gear 11 to rotate through the input connection sleeve 21. The first-stage ring gear 5 meshes, the first-stage planetary gear 10 revolves around the first-stage sun gear 11, and the operating force transmits the second-stage sun gear 14 through the first-stage planetary carrier 9, and so on, and the power is transmitted to the fourth-stage planetary carrier 18, the fourth-stage planet carrier 18 drives the output gear shaft 22 to rotate through the spline, and the output gear shaft 22 drives the turntable of the wind turbine base to rotate, so that the blades of the wind generator can adapt to the changing wind direction, ensuring that the wind generator The blades are always in the direction of windward or away from the wind.

Claims (6)

1. A yaw reduction device for wind power generation, comprising a box body, a sun gear, a planetary wheel, a planet carrier, an inner ring gear, and an output gear shaft (22), and the box body includes a motor flange (1), an upper box body (2 ), the middle box (3), the support body (4), and the oil seal seat (28). The box is equipped with a four-stage planetary transmission structure, and the second-stage internal ring gear (6) is fixedly connected to the motor flange and Between the upper casings, the third-stage internal gear ring (7) is fixedly connected between the upper casing and the middle casing by bolts, and the fourth-stage internal ring gear (8) is fixedly connected by bolts to the middle casing and the support body Between, the first-stage planetary carrier (10) is connected to the second-stage sun gear (14) through splines, the second-stage planetary carrier (12) is connected to the third-stage sun gear (17) through splines, and the third-stage The planetary carrier (15) is connected to the fourth-stage sun gear (20) through splines, and the fourth-stage planetary carrier (18) is connected to the output gear shaft through splines; the output gear shaft is installed in the support body through upper and lower bearings (24) And sealed by the oil seal seat, it is characterized in that: the first-stage internal ring gear (5) is connected to the motor flange through bolts; the motor input connection sleeve (21) is installed in the motor flange through the bearing, and the motor input connection sleeve The internal teeth are meshed with the external teeth of the first-stage sun gear (11), and the internal teeth of the motor input connection sleeve and the external teeth of the first-stage sun gear have the same modulus, the same number of teeth, and a pressure angle of 20°. 2. The yaw reduction device for wind power generation according to claim 1, characterized in that: two parallel skeleton oil seals (23) are arranged between the upper and lower bearings (24) on the output gear shaft (22); An end face oil seal (29) is provided between the support body (4) and the oil seal seat (28). 3. The yaw deceleration device for wind power generation according to claim 1, characterized in that: a quick release joint (27) is provided on the side wall of the support body (4). 4. The yaw reduction device for wind power generation according to claim 1, characterized in that: the gears of the planetary structure at each stage adopt a tooth shape with a pressure angle of 25° and a head clearance coefficient of 0.4. 5. The yaw deceleration device for wind power generation according to claim 1, characterized in that: the planetary frames at all levels adopt a double-wall integral structure; the bearings for installing planetary wheels on the first-stage planetary frame are Cylindrical roller bearings, and the bearings used to install the planetary wheels on the other three-stage planetary carriers are double-row needle bearings. 6. The yaw reduction device for wind power generation according to claim 1, characterized in that: the motor flange (1), the second-stage inner ring gear (6), the upper box (2), and the third-stage inner gear O-rings are provided on the connecting surfaces of the ring gear (7), the middle box body (3), the fourth-stage inner ring gear (8), and the support body (4).

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