Input end structure of wind power yaw variable pitch speed reducer

Abstract

The utility model discloses an input end structure of a wind power yawing variable-pitch speed reducer. Comprising an input shaft supported in a speed reducer box through a bearing, a first-stage sun gear connected with the input shaft, a first-stage planet gear meshed with the first-stage sun gear, a first-stage planet carrier connected with the first-stage planet gear, and an inner gear ring meshed on the periphery of the first-stage planet gear and fixed to the speed reducer box. The transmission is characterized in that an inner spline cavity connected with a spline at the output end of the driving motor is downwards formed in the top face of the input shaft, an inner gear cavity coaxially aligned with the inner spline cavity is upwards formed in the bottom face of the input shaft, the inner gear cavity and the inner spline cavity are separated and not communicated, and the first-stage sun gear stretches into the inner gear cavity in a meshed mode; and a gap is reserved between the top surface and the top wall of the inner gear cavity. The assembly efficiency of the speed reducer is improved, the cost is reduced, oil liquid is prevented from leaking between the first-stage sun gear and the input shaft, the oil leakage risk of the speed reducer is reduced, the probability of pitting corrosion under the extreme working condition is effectively reduced, and the operation reliability of the speed reducer is improved.

Description

Technical Field

[0001] The utility model relates to an input end structure of a wind power yaw and pitch speed reducer, belonging to the technical field of wind power yaw and pitch speed reducers. Background Art

[0002] The wind power yaw and pitch speed reducer is a key transmission component in the wind power generation system. It converts the high-speed and low-torque rotation of the driving motor into the low-speed and high-torque rotation of the driving blade root bearing to adjust the direction and angle of the wind turbine blades. At present, most yaw and pitch speed reducers in the industry adopt multi-stage planetary gear transmission. There are generally interference fits between the spline sleeve at the input end of the yaw and pitch speed reducer and the first-stage sun gear, which has the following defects:

[0003] 1. During installation, it is necessary to heat the spline sleeve and freeze the sun gear before press-fitting. The fitting time is long, the efficiency is low, and the cost is high.

[0004] 2. Under extremely harsh working conditions, the output gear shaft undergoes large deformation, and the transmission central axis of the speed reducer is offset. Since the input end is an interference fit, the first-stage sun gear cannot float or change the rotation axis, resulting in a slight change in the gear meshing position and an increase in the local force on the tooth surface, which may cause pitting.

[0005] 3. If the manufacturing error exceeds the standard, it may lead to a too small interference amount, and there is a risk of oil leakage at the input end. Summary of the Utility Model

[0006] The input end structure of the wind power yaw and pitch speed reducer provided by the utility model has a simpler assembly between the input shaft and the first-stage sun gear, improves the assembly efficiency of the speed reducer, reduces the cost, avoids oil leakage from between the first-stage sun gear and the input shaft, reduces the oil leakage risk of the speed reducer, effectively reduces the occurrence probability of pitting under extreme working conditions, and improves the operation reliability of the speed reducer.

[0007] To achieve the above object, the technical solution adopted by the utility model is:

[0008] The input end structure of the wind power yaw and pitch speed reducer includes an input shaft supported in the speed reducer housing through bearings, a first-stage sun gear connected to the input shaft, a first-stage planetary gear meshing with the first-stage sun gear, a first-stage planetary carrier connected to the first-stage planetary gear, and an internal gear ring meshing on the outer periphery of the first-stage planetary gear and fixed to the speed reducer housing. It is characterized in that: the input shaft is provided with an internal spline cavity for spline connection with the output end of the driving motor from the top surface downward, and an internal gear cavity coaxially aligned with the internal spline cavity from the bottom surface upward. The internal gear cavity is separated from the internal spline cavity and not connected. The first-stage sun gear meshes and extends into the internal gear cavity, and there is a gap between the top surface and the top wall of the internal gear cavity.

[0009] Preferably, the inner gear cavity sequentially includes a gear section with evenly distributed key teeth on the inner wall from bottom to top and a first light cylinder section with a smooth cylinder surface on the inner wall. The first-stage sun gear meshes with the gear section and extends into the first light cylinder section through the clearance fit of the gear section.

[0010] Preferably, the outer circumference of the first-stage sun gear has an external gear extending from the bottom surface to the top surface with a constant diameter. The lower end of the external gear meshes with the first-stage planetary gear, and the upper end extends into the inner gear cavity to mesh with the gear section.

[0011] Preferably, the internal spline cavity includes a spline section with internal splines and a second light cylinder section with a smooth cylinder surface on the inner wall. The second light cylinder section is arranged at the bottom of the spline section, and the second light cylinder section is separated from the first light cylinder section by a separating section and is not connected.

[0012] The beneficial effects of the present utility model are as follows:

[0013] For the input end structure of the wind power yaw and pitch reducer of the present utility model, an internal spline cavity and an inner gear cavity are provided on the input shaft. The internal spline cavity can be spline-connected with the output end of the driving motor, and the inner gear cavity is meshed and connected with the first-stage sun gear. The assembly of the input shaft and the first-stage sun gear is simpler, improving the assembly efficiency of the reducer and reducing costs. The inner gear cavity and the internal spline cavity are separated and not connected, avoiding oil leakage from between the first-stage sun gear and the input shaft and reducing the oil leakage risk of the reducer. There is a gap between the top surface of the first-stage sun gear and the top wall of the inner gear cavity, enabling the first-stage sun gear to have a certain axial floating amount, and the meshing of the first-stage sun gear and the inner gear cavity will form an internal and external tooth clearance. Under extremely harsh working conditions, when the output gear shaft of the reducer undergoes large deformation resulting in the offset of the central axis, the first-stage sun gear can float up and down and slightly change the rotation axis within the internal and external tooth clearance, keeping the rotation axis of the first-stage sun gear parallel to the rotation axis of the first-stage planetary gear. The tooth surfaces of the first-stage sun gear and the first-stage planetary gear in mesh are more evenly stressed, avoiding excessive local load, thereby effectively reducing the occurrence probability of pitting under extreme working conditions and improving the operation reliability of the reducer. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the input end structure of the wind power yaw and pitch reducer in the specific embodiment.

[0015] Figure 2 It is Figure 1 a partially enlarged schematic diagram of

[0016] Figure 3 It is a schematic diagram of the input shaft.

[0017] Figure 4 It is a schematic diagram of the first-stage sun gear. Specific Embodiment

[0018] The following is combined withFigures 1 to 4 A detailed description will be given to the embodiments of the present utility model.

[0019] The input end structure of a wind power yaw and pitch reducer includes an input shaft 1 supported in the reducer housing through bearings, a first-stage sun gear 2 connected to the input shaft 1, a first-stage planet gear 3 meshing with the first-stage sun gear 2, a first-stage planet carrier 4 connected to the first-stage planet gear 3, and an internal gear ring 5 meshing on the outer periphery of the first-stage planet gear 3 and fixed to the reducer housing. It is characterized in that: the input shaft 1 is provided with an internal spline cavity 6 for spline connection with the output end of the drive motor from the top surface downward, and an internal gear cavity 7 coaxially aligned with the internal spline cavity 6 is provided from the bottom surface upward. The internal gear cavity 7 is separated from the internal spline cavity 6 and not connected. The first-stage sun gear 2 meshes and extends into the internal gear cavity 7, and there is a gap between the top surface and the top wall of the internal gear cavity.

[0020] For the above-mentioned input end structure of the wind power yaw and pitch reducer, an internal spline cavity 6 and an internal gear cavity 7 are provided on the input shaft 1. The internal spline cavity 7 can be spline-connected with the output end of the drive motor. The internal gear cavity 7 is meshingly connected with the first-stage sun gear 5. The assembly of the input shaft 1 and the first-stage sun gear 2 is simpler, improving the assembly efficiency of the reducer and reducing costs. The internal gear cavity 7 is separated from the internal spline cavity 6 and not connected, avoiding oil leakage between the first-stage sun gear 2 and the input shaft 1 and reducing the oil leakage risk of the reducer. There is a gap between the top surface of the first-stage sun gear 2 and the top wall of the internal gear cavity 7, enabling the first-stage sun gear 2 to have a certain axial floating amount. And when the first-stage sun gear 2 meshes with the internal gear cavity 7, an internal and external tooth clearance will be formed. Under extremely harsh working conditions, when the output gear shaft of the reducer undergoes large deformation resulting in the offset of the central axis, the first-stage sun gear 2 can float up and down and slightly change the rotation axis within the internal and external tooth clearance, so that the rotation axis of the first-stage sun gear 2 remains parallel to the rotation axis of the first-stage planet gear 3, and the tooth surface force between the first-stage sun gear 2 and the first-stage planet gear 3 is more uniform, avoiding excessive local load, thereby effectively reducing the occurrence probability of pitting under extreme working conditions and improving the operation reliability of the reducer.

[0021] Among them, the internal gear cavity 7 sequentially includes a gear section 71 with evenly distributed key teeth on the inner wall from bottom to top and a first light cylinder section 72 with a smooth cylinder inner wall. The first-stage sun gear 2 meshes with the gear section 71 and extends into the first light cylinder section 72 through the gap of the gear section 71 with clearance fit. The gear section 71 meshes with the first-stage sun gear 2, and an internal and external tooth clearance will be formed between the gear section 71 and the first-stage sun gear 2, enabling the first-stage sun gear 2 to slightly change the rotation axis within the internal and external tooth clearance during the transmission process to adapt to the offset of the central axis of the output gear shaft of the reducer. The first light cylinder section 72 has a clearance fit with the first-stage sun gear 2, without interfering with the radial floating of the first-stage sun gear 2 and being easy to process and form.

[0022] Among them, the outer periphery of the first-stage sun gear 2 is provided with an external gear 21 that extends from the bottom surface to the top surface and has a constant diameter. The lower end of the external gear 21 meshes with the first-stage planet gear 2, and the upper end extends into the internal gear cavity 7 and meshes with the gear segment 71. The outer periphery of the first-stage sun gear 2 is machined from the bottom to the top into an external gear 21 with only one type of tooth profile. The upper end of the external gear 21 extends into the internal gear cavity 7 and meshes with the gear segment 71, and the lower end meshes with the first-stage star gear 3. The machining of the first-stage sun gear 2 is simple and easy to form.

[0023] Among them, the internal spline cavity 6 includes a spline segment 61 with internal splines and a second light cylinder segment 62 whose inner wall is a smooth cylinder surface. The second light cylinder segment 62 is arranged at the bottom of the spline segment 61, and the second light cylinder segment 62 and the first light cylinder segment 72 are separated by a separating segment 8 and are not connected. The spline segment 61 is spline-connected to the output segment of the driving motor. The separating segment 8 separates the internal spline cavity 6 from the internal gear cavity 7, and the two are not connected, which is equivalent to sealing the input shaft 1 and avoiding the risk of oil leakage between the input shaft 1 and the first-stage sun gear 2 caused by machining errors.

[0024] The technical solutions of the embodiments of the present invention are completely described above in conjunction with the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

Claims

1. The input end structure of a wind turbine yaw pitch reducer comprises an input shaft supported in a reducer housing by a bearing, a first-stage sun gear connected to the input shaft, a first-stage planetary gear meshed with the first-stage sun gear, a first-stage planetary carrier connected to the first-stage planetary gear, and an inner gear ring meshed with the outer periphery of the first-stage planetary gear and fixed to the reducer housing, characterized in that: The input shaft is provided with an inner spline cavity connected to the output end spline of the driving motor from the top surface downward, and an inner gear cavity coaxially aligned with the inner spline cavity is provided from the bottom surface upward. The inner gear cavity is separated from the inner spline cavity and is not connected. The first-stage sun gear meshes and extends into the inner gear cavity, and a gap is left between the top surface and the top wall of the inner gear cavity.

2. The input end structure of the wind turbine yaw pitch reducer according to claim 1, characterized in that: The inner gear cavity comprises, from bottom to top, a gear segment with evenly distributed key teeth on the inner wall and a smooth cylinder segment 1 with a smooth cylinder surface on the inner wall. The first-stage sun gear meshes with the gear segment and extends into the smooth cylinder segment 1 through the clearance of the gear segment.

3. The input end structure of the wind turbine yaw pitch reducer according to claim 2 is characterized in that: The outer periphery of the first-stage sun gear has an external gear extending from the bottom surface to the top surface with a constant diameter. The lower end of the external gear meshes with the first-stage planetary gear, and the upper end extends into the internal gear cavity and meshes with the gear segment.

4. The input end structure of the wind turbine yaw pitch reducer according to claim 2, characterized in that: The inner spline cavity comprises a spline segment with inner splines and a second smooth tube segment with a smooth tube surface as the inner wall. The second smooth tube segment is arranged at the bottom of the spline segment, and the second smooth tube segment is separated from the first smooth tube segment by a separation segment.

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