CN114278718A - Yaw gear box - Google Patents
Yaw gear box Download PDFInfo
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- CN114278718A CN114278718A CN202111660634.6A CN202111660634A CN114278718A CN 114278718 A CN114278718 A CN 114278718A CN 202111660634 A CN202111660634 A CN 202111660634A CN 114278718 A CN114278718 A CN 114278718A
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Abstract
The invention discloses a yaw gearbox, which comprises an input end, an output end and a multi-stage planetary gear structure, wherein the multi-stage planetary gear structure comprises at least one stage of single-arm planetary assembly, the single-arm planetary assembly comprises a planetary frame, a planetary shaft, a planetary wheel and a sun wheel meshed with the planetary wheel, the planetary frame and the planetary shaft are of an integrated structure, and the planetary wheel is sleeved on the planetary shaft through a bearing without an outer ring; the planet shaft is provided with a positioning step used for being abutted against the lower end face of the outer-ring-free bearing, the upper end face of the planet shaft is provided with a bending groove containing at least one bending bayonet, the bottom surface of the bending groove is lower than the upper end face of the planet wheel, and the outer wall face of the bending groove is bent outwards so as to axially position the upper end face of the outer-ring-free bearing; the upper end face of the planet carrier is provided with a wear pad which is used for being in contact with the lower end face of the sun gear, and the lower end face of the planet carrier is used for being in key connection with the output end or the next-stage sun gear. By omitting the bearing accessories such as the gasket and the snap spring, the structure is simplified, the assembly is convenient, and the axial height is reduced.
Description
Technical Field
The invention relates to the technical field of fans, in particular to a yaw gearbox.
Background
The yaw gear box is used as a speed reducer, is an important component of the wind generating set and mainly comprises an input end, a multi-stage planetary gear structure and an output end.
Referring to fig. 1, the yaw gearbox adopts a four-stage planetary gear structure, the first-stage planetary assembly and the second-stage planetary assembly are single-arm planetary assemblies, and the third-stage planetary assembly and the fourth-stage planetary assembly are double-arm planetary assemblies. The planet shaft in each stage of planet assembly is arranged in the planet carrier, the planet shaft is sleeved with a planet wheel, the planet wheel is meshed with the sun wheel of the stage, and the planet carrier is connected with the sun wheel key of the next stage. During assembly, the planet shaft is arranged in the mounting hole of the planet carrier, the upper gasket, the bearing, the planet wheel and the lower gasket are sequentially arranged, and finally the planet shaft is axially positioned through the upper snap spring and the lower snap spring.
Coaxiality errors caused by machining of a mounting hole of the planet carrier and mounting of a planet shaft can cause unbalance loading of a planet wheel in work, further abnormal sound and poor meshing are caused, and the quality of a yaw gearbox is influenced; the planet shaft is hot-pressed, the gasket, the bearing, the planet wheel, the snap spring and the like are cold-pressed, the number of related parts is large, the assembly process is complex, the assembly cost is increased, the axial height of each stage of planet assembly is increased, the overall size and the quality of the yaw gearbox are increased, and the yaw gearbox is not suitable for the light-weighted development direction of the yaw gearbox.
In summary, how to simplify the structure of the yaw gearbox and reduce the overall volume and mass of the yaw gearbox is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides a yaw gearbox, in which a multi-stage planetary gear structure adopts a single-arm planetary assembly, a planetary shaft structure is used in the single-arm planetary assembly to axially position a bearing without an outer ring, bearing accessories such as a gasket and a snap spring are not required, the structure is simple, the assembly is convenient, and the overall height and quality of the yaw gearbox are reduced.
In order to achieve the above purpose, the invention provides the following technical scheme:
a yaw gearbox comprises an input end, an output end and a multi-stage planetary gear structure, wherein the multi-stage planetary gear structure comprises at least one stage of single-arm planetary assembly, the single-arm planetary assembly comprises a planetary frame, a planetary shaft, a planetary wheel and a sun wheel meshed with the planetary wheel, the planetary frame and the planetary shaft are of an integrated structure, and the planetary wheel is sleeved on the planetary shaft through a bearing without an outer ring;
the planet shaft is provided with a positioning step used for being abutted against the lower end face of the outer ring-free bearing, the upper end face of the planet shaft is provided with a bending groove containing at least one bending bayonet, the bottom surface of the bending groove is lower than the upper end face of the planet wheel, and the outer wall face of the bending groove is outwards bent so as to axially position the upper end face of the outer ring-free bearing;
the up end of planet carrier be equipped with be used for with the wearing pad of the lower terminal surface contact of sun gear, the lower terminal surface of planet carrier be used for with output or next-level sun gear key-type connection.
Preferably, the input end comprises an input box body, a transmission sleeve, a vent cap and an oil filling screw plug, the vent cap is arranged at the upper end of the input box body, and the oil filling screw plug is arranged at the lower end of the input box body;
the upper end of the transmission sleeve is used for being connected with a motor shaft, and the lower end of the transmission sleeve is connected with a first-stage sun gear of the multi-stage planetary gear structure so as to transmit the torque of the motor shaft to the multi-stage planetary gear structure;
the transmission sleeve is arranged in an inner cavity of the input box body, a positioning step is arranged at the top of the inner cavity of the input box body, and the positioning step is used for preventing the transmission sleeve from axially moving and detecting and controlling the axial total gap of the input end.
Preferably, the transmission sleeve is in splined connection with the motor shaft.
Preferably, the transmission sleeve is in tooth connection with the primary sun gear.
Preferably, the output end comprises an output box body, an output gear shaft, a bearing sealing cover and an adjusting pad, the output gear shaft is sequentially sleeved with the bearing, the bearing sealing cover and the adjusting pad from top to bottom, the upper end face of the bearing sealing cover is abutted to the end face of an inner ring of the bearing, and the inner ring of the bearing sealing cover is in clearance fit with the output gear shaft;
the outer ring of the bearing sealing cover is higher than the inner ring of the bearing sealing cover, the upper end of the outer ring of the bearing sealing cover is provided with an inward-bent rolling opening, the rolling opening is in interference fit with the end face of the outer ring of the bearing, and the outer ring of the bearing sealing cover is in interference fit with the mounting hole of the output box body;
the adjusting pad is in interference fit with the output gear shaft, and the upper surface of the adjusting pad is abutted to the lower end face of the bearing so as to axially position the bearing sealing cover.
Preferably, the inner ring of the adjusting pad is provided with a chamfer, and the size of the chamfer is 0.5-1mm larger than that of the transition fillet of the output gear shaft.
Preferably, the output gear shaft is of a hollow structure, and a lightening hole is formed in the lower end face of the output gear shaft.
Preferably, the wear pad is flat, and the wear pad is in interference connection with the planet carrier.
When the yaw gearbox is assembled, firstly, the planet wheel is sleeved on the planet shaft through the outer-ring-free bearing, the lower end face of the outer-ring-free bearing is abutted against the positioning step face of the planet shaft, the lower end face of the outer-ring-free bearing is axially limited, the outer wall face of the bending groove is knocked by a tool to enable the outer wall face of the bending groove to be uniformly bent outwards, the upper end face of the outer-ring-free bearing is axially limited, and the assembly of a first-stage single-arm planet assembly is completed; and then, the input end and the first-stage sun gear, the first-stage planet carrier and the second-stage sun gear … … are sequentially connected with the final-stage planet carrier and the output end from top to bottom, and the overall assembly of the yaw gearbox is completed.
In the yaw gearbox provided by the invention, the planet shaft and the planet carrier in each stage of single-arm planet assembly are of an integrated structure, so that the coaxiality error of the planet shaft and the planet carrier caused by assembly is avoided, and the unbalance loading of the planet wheel is avoided, thereby avoiding the problems of abnormal sound, poor meshing and the like and improving the operation safety.
The outer-ring-free bearing is axially positioned through the bending groove, and parts such as a gasket, a clamp spring and the like are not required to be arranged, so that the single-arm planetary assembly is simple in structure and convenient to assemble, and the assembly efficiency is improved; the problems that the planet shaft moves or the clamp spring falls into other transmission parts and the like caused by the neglected assembly or the improper assembly of the clamp spring and the like are avoided, the overall safety of the yaw gearbox is improved, and the operation and maintenance cost is reduced; the axial height of the single-arm planetary assembly is reduced.
Therefore, the multi-stage planetary gear structure adopts the single-arm planetary assembly, and compared with the mixed arrangement of the single-arm planetary assembly and the double-arm planetary assembly, the multi-stage planetary gear structure is beneficial to reducing the overall height and the quality of the multi-stage planetary gear structure, so that the yawing gear box is compact in structure and is beneficial to the light-weight arrangement of the yawing gear box.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of a prior art yaw gearbox;
FIG. 2 is a schematic structural view of the single arm planetary assembly of FIG. 1;
FIG. 3 is an enlarged view of a portion of area A of FIG. 1;
FIG. 4 is a schematic structural view of an embodiment of a yaw gearbox provided by the present invention;
FIG. 5 is a schematic structural view of an embodiment of the single arm planetary assembly of FIG. 4;
FIG. 6 is a top view of the gear shaft of FIG. 5;
FIG. 7 is a partial enlarged view of the area B in FIG. 5;
FIG. 8 is a schematic diagram of the input terminal of FIG. 4;
FIG. 9 is a schematic diagram of the structure of the output terminal of FIG. 5;
fig. 10 is a partially enlarged view of the region C in fig. 9.
In fig. 1-10:
01 is a gasket, 02 is a snap spring, 1 is an input end, 11 is an input box body, 12 is a transmission sleeve, 13 is a vent cap, 14 is an oil filling screw plug, 2 is a multi-stage planetary gear structure, 21 is a planetary carrier, 22 is a planetary shaft, 221 is a bending groove, 222 is a bending bayonet, 23 is a planetary gear, 24 is a bearing without an outer ring, 25 is a sun gear, 26 is a wear-resistant pad, 3 is an output end, 31 is an output box body, 32 is an output gear shaft, 33 is a bearing, 34 is a bearing sealing cover, 35 is an adjusting pad, and h is an axial total gap.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide the yaw gearbox, the multi-stage planetary gear structures all adopt single-arm planetary components, the planetary shaft structures are utilized in the single-arm planetary components to axially position the bearings without outer rings, bearing accessories such as gaskets, snap springs and the like are not needed, the structure is simple, the assembly is convenient, and the overall height and the quality of the yaw gearbox are reduced.
Please refer to fig. 1-10.
The invention provides a yaw gearbox, which comprises an input end 1, an output end 3 and a multi-stage planetary gear structure 2, wherein the multi-stage planetary gear structure 2 comprises at least one stage of single-arm planetary assembly, the single-arm planetary assembly comprises a planetary frame 21, a planetary shaft 22, a planetary wheel 23 and a sun wheel 25 meshed with the planetary wheel 23, the planetary frame 21 and the planetary shaft 22 are of an integral structure, and the planetary wheel 23 is sleeved on the planetary shaft 22 through a bearing 24 without an outer ring; the planet shaft 22 is provided with a positioning step used for being abutted against the lower end face of the outer-ring-free bearing 24, the upper end face of the planet shaft 22 is provided with a bending groove 221 containing at least one bending bayonet 222, the bottom surface of the bending groove 221 is lower than the upper end face of the planet wheel 23, and the outer wall face of the bending groove 221 is bent outwards so as to axially position the upper end face of the outer-ring-free bearing 24; the upper end face of the planet carrier 21 is provided with a wear pad 26 which is used for contacting with the lower end face of the sun gear 25, and the lower end face of the planet carrier 21 is used for being in key connection with the output end 3 or the sun gear 25 of the next stage.
Referring to fig. 1 and 4, in the multi-stage planetary gear structure 2, the planet carrier 21 of the single-arm planetary assembly of the previous stage is keyed with the sun gear 25 of the single-arm planetary assembly of the next stage, so as to transmit torque and load from the single-arm planetary assembly of the previous stage to the single-arm planetary assembly of the next stage, and drive the sun gear 25 of the single-arm planetary assembly of the next stage to rotate; the planet carrier 21 of the last single-arm planetary assembly is keyed with the output gear shaft 32 of the output 3 to transmit torque and load to the output 3.
The specific number of stages of the multi-stage planetary gear structure 2 and the reduction ratio of each stage of single-arm planetary assembly are determined according to the requirements in actual production, and are not described in detail herein.
In each stage of the single-arm planetary assembly, referring to fig. 5, the planetary gear 23 is sleeved on the planetary shaft 22, the planetary gear 23 is meshed with the sun gear 25 of the stage, and when the sun gear 25 rotates, the sun gear 25 drives the planetary gear 23 meshed therewith to rotate, so as to drive the planetary shaft 22 and the planetary carrier 21 integrally arranged with the planetary shaft 22 to rotate; the upper end surface of the carrier 21 is provided with a wear pad 26, and the upper end surface of the wear pad 26 contacts the lower end surface of the sun gear 25 to support the sun gear 25 and restrict the axial play of the sun gear 25.
The planet shaft 22 and the planet carrier 21 are integrated, please refer to fig. 5, the planet shaft 22 is connected to the upper end surface of the planet carrier 21, and the strength of the axis of the planet shaft 22 from the center of the axis of the mounting hole of the planet carrier 21, the height of the planet shaft 22, and the like is checked, calculated and determined according to the actual production requirements, which is not described herein again.
The planet shaft 22 and the planet carrier 21 are integrally arranged, so that gaskets 01 arranged on the upper surface and the lower surface of the planet wheel 23 of the existing single-arm planet component and a lower snap spring used for axially positioning the lower end surface of the planet shaft 22 can be omitted.
The upper end surface of the planet shaft 22 is provided with the bending groove 221 as shown in fig. 4 and 6, and the bottom surface of the bending groove 221 is lower than the upper end surface of the planet wheel 23, so that the outer wall surface of the bending groove 221 can be bent to enable the outer wall surface of the bending groove 221 to be abutted against the upper end surface of the planet wheel 23, and further the axial positioning of the planet wheel 23 is realized.
The bending groove 221 may be a rectangular groove or a trapezoidal groove. Preferably, in consideration of the ease of the bending operation, the cross section of the bending groove 221 may be trapezoidal, and the thickness of the outer wall surface of the trapezoidal groove gradually decreases from bottom to top, so that the bending by knocking is easier.
In order to facilitate the bending of the bending groove 221, at least one bending bayonet 222 is disposed on the bending groove 221, and the bending bayonet 222 does not need to be bent outward, so that the bending groove 221 on both sides of the bending bayonet 222 is better bent outward. Preferably, the bent bayonets 222 may be arranged to be evenly distributed in the circumferential direction of the planet shaft 22.
The shape and size of the bending groove 221 and the number and size of the bending bayonets 222 need to be determined according to the size and design strength requirements of the planet shaft 22 in actual production, so as to prevent the bending groove 221 from being too wide and too deep to affect the strength of the planet shaft 22, or prevent the bending groove 221 from being too shallow and too narrow to be bent easily.
During assembly, the outer-ring-free bearing 24 and the planet wheel 23 are sleeved on the planet shaft 22, so that the lower end face of the outer-ring-free bearing 24 is abutted against the positioning step face of the planet shaft 22, and the axial position of the lower end face of the outer-ring-free bearing 24 is fixed; and knocking the outer wall surface of the bending groove 221 by using a tool, uniformly bending the outer wall surface of the bending groove 221 outwards, and axially positioning the upper end surface of the outer-ring-free bearing 24 to complete the assembly of the single-stage single-arm planetary assembly.
And then, sequentially connecting the input end 1 and the first-stage sun gear, the first-stage planet carrier and the second-stage sun gear, … …, and the final-stage planet carrier and the output end 3 from top to bottom to finish the integral assembly of the yaw gearbox.
In this embodiment, the planet shaft 22 and the planet carrier 21 of the single-arm planet assembly are of an integrated structure, so that the coaxiality error of the planet shaft 22 and the planet carrier 21 caused by assembly is avoided, and the unbalance loading of the planet wheel 23 is avoided, thereby avoiding the problems of abnormal sound, poor meshing and the like and improving the operation safety.
The outer-ring-free bearing 24 is axially positioned through the bending groove 221, and parts such as a gasket 01, a clamp spring 02 and the like are not required to be arranged, so that the single-arm planetary assembly is simple in structure and convenient to assemble, and the assembly efficiency is improved; the problems that the planet shaft 22 moves or the clamp spring 02 falls into other transmission parts and the like caused by neglected assembly or improper assembly of the clamp spring 02 and the like are solved, the overall safety of the yaw gearbox is improved, and the operation and maintenance cost is reduced; the axial height of the single-arm planetary assembly is reduced.
Therefore, the multi-stage planetary gear structure 2 adopts the single-arm planetary assembly, and compared with the mixed arrangement of the single-arm planetary assembly and the double-arm planetary assembly, the multi-stage planetary gear structure 2 is beneficial to reducing the overall height and the quality of the multi-stage planetary gear structure 2, so that the yawing gear box is compact in structure and beneficial to the light-weight arrangement of the yawing gear box.
In addition to the above embodiments, the wear pad 26 may be provided in a flat plate shape, and the wear pad 26 is connected to the carrier 21 in an interference manner.
In order to reduce the wear of the wear pad 26 and prolong the service life of the wear pad 26, the wear pad 26 may be made of a wear-resistant material with high strength, or the surface of the wear pad may be hardened, and the specific material, shape and size of the wear pad 26 are determined according to the size of each stage of the sun gear 25 in actual production, which is not described herein again.
In the embodiment, the flat-plate-shaped wear pad 26 is in interference connection with the planet carrier 21, and compared with the prior art that the arc-shaped support plate is fixed in the wear pad mounting hole through the clamp spring 02, on one hand, the clamp spring 02 is omitted, the structure of the single-arm planet assembly is simplified, and the assembly efficiency is improved; on the other hand, the height of the wear pad mounting hole in the planet carrier 21 is reduced, and the axial height of the single-arm planet assembly is reduced, so that the internal structure of the yaw gearbox is more compact, and the light weight of the yaw gearbox is facilitated.
On the basis of the above embodiment, in order to reduce the overall height and weight of the yaw gearbox, please refer to fig. 8, the input end 1 may include an input box 11, a transmission sleeve 12, a vent cap 13 and a refueling plug screw 14, the vent cap 13 is disposed at the upper end of the input box 11, and the refueling plug screw 14 is disposed at the lower end of the input box 11; the upper end of the transmission sleeve 12 is used for being connected with a motor shaft, and the lower end of the transmission sleeve 12 is connected with a first-stage sun gear of the multi-stage planetary gear structure 2 so as to transmit the torque of the motor shaft to the multi-stage planetary gear structure 2; the transmission sleeve 12 is installed in the inner cavity of the input box body 11, and the top of the inner cavity of the input box body 11 is provided with a positioning step which is used for preventing the transmission sleeve 12 from axially moving and detecting and controlling the axial total gap h of the input end 1.
Referring to fig. 1 and 8, the transmission sleeve 12 is disposed in the inner cavity of the input box 11, and the input box 11 is no longer provided with a mounting hole for mounting the transmission sleeve 12, and meanwhile, bearing accessories such as a bearing, an oil seal, a snap spring 02 and the like between the mounting hole and the transmission sleeve 12 are eliminated, so that the structure of the input box 11 is greatly simplified, and casting and subsequent machining processes of the input box 11 are facilitated.
One end and the motor shaft of driving sleeve 12 are connected, and the other end is connected with multistage planetary gear structure 2's one-level sun gear, and is preferred, and in order to make things convenient for the assembly, be equipped with the motor shaft mounting hole that is used for installing the motor shaft in driving sleeve 12 and be used for installing the sun gear mounting hole of one-level sun gear, be equipped with transition step hole between motor mounting hole and the sun gear installation.
The setting in transition step hole can avoid motor shaft and one-level sun gear to take place to interfere in assembly and motion process on the one hand, and on the other hand still is the sufficient installation space that motor shaft and one-level sun gear provided, the dismouting of being convenient for.
The specific size of the transition step hole is determined according to factors such as the design strength requirement of the transmission sleeve 12 in actual production, and the like, and is not described in detail herein.
Considering that the diameter of the primary sun gear is generally smaller than the diameter of the motor shaft, it is preferable that the outer diameter of the upper end of the driving sleeve 12 is set larger than the outer diameter of the lower end of the driving sleeve 12 to reduce the weight of the driving sleeve 12.
During assembly, the primary sun gear of the multi-stage planetary gear structure 2 is axially positioned by the primary wear pad and is connected with the lower end of the transmission sleeve 12, so that the lower end surface of the transmission sleeve 12 is axially positioned; the upper end of the transmission sleeve 12 is connected with the motor shaft, the transmission sleeve 12 is installed in the inner cavity of the input box body 11, the axis of the motor shaft is aligned with the axis of the motor shaft installation hole of the input box body 11, the positioning step face faces the upper end face of the transmission sleeve 12 at the moment, the gap between the positioning step face and the upper end face of the transmission sleeve 12 is the axial total gap h of the input end 1, the axial total gap h is convenient to observe, and the axial total gap h is favorably controlled in the assembling process.
In this embodiment, the transmission sleeve 12 is only located in the inner cavity of the input box 11 and does not have a connection relation with the input box 11, so that original bearing accessories such as a bearing, an oil seal and a snap spring 02 are saved, assembly parts are reduced, the overall height of the input end 1 is reduced, the production cost is saved, and the light-weight design of the yaw gearbox is facilitated.
Simultaneously, save the bearing after, refuel the position and need not to exceed the bearing terminal surface again, the reduction of refueling the position makes the expansion space increase, and then has reduced the height of input box 11, and can save the oil pointer that is used for observing the lubricated condition of bearing, further reduced input 1's manufacturing cost.
In addition, the vent cap 13 and the oil filling screw plug 14 do not need to be integrally arranged into a vent cap and an oil filling assembly in the figure 1, the structure of parts is simple, and the production cost is lower.
The specific kind, structure, size, position and connection manner of both the vent cap 13 and the filler plug 14 are determined according to the needs in actual production with reference to the prior art, and will not be described in detail herein.
Preferably, the upper end of the transmission sleeve 12 can be connected with the motor shaft through splines, and compared with the flat key connection, the spline connection is short in connection length and high in connection rigidity, so that the overall height of the input end 1 can be further shortened.
The shape and size of the spline are determined according to the size of the transmission sleeve 12 and the motor shaft in actual production, the design connection strength requirement and other factors, and are not described in detail herein.
Preferably, the lower end of the transmission sleeve 12 can be connected with the primary sun gear, and compared with interference fit, the connection rigidity of the transmission sleeve 12 and the primary sun gear is higher, so that torque transmission between the transmission sleeve 12 and the primary sun gear is facilitated.
The internal teeth are arranged in the sun gear mounting hole of the transmission sleeve 12, the external teeth matched with the internal teeth are arranged on the circumferential part of the upper end of the primary sun gear, and the specific tooth shapes, sizes and the like of the internal teeth and the external teeth are determined according to factors such as the size, the design connection rigidity requirement and the like of the primary sun gear in actual production, and are not repeated herein.
On the basis of the above embodiment, in order to further reduce the overall height and mass of the yaw gearbox, please refer to fig. 9 and 10, the output end 3 includes an output box 31, an output gear shaft 32, a bearing 33, a bearing sealing cover 34 and an adjusting pad 35, the output gear shaft 32 is sequentially sleeved with the bearing 33, the bearing sealing cover 34 and the adjusting pad 35 from top to bottom, the upper end surface of the bearing sealing cover 34 is abutted to the end surface of the inner ring of the bearing 33, and the inner ring of the bearing sealing cover 34 is in clearance fit with the output gear shaft 32; the outer ring of the bearing sealing cover 34 is higher than the inner ring of the bearing sealing cover 34, the upper end of the outer ring of the bearing sealing cover 34 is provided with an inward-bent rolling opening, the rolling opening is in interference fit with the end face of the outer ring of the bearing 33, and the outer ring of the bearing sealing cover 34 is in interference fit with the mounting hole of the output box body 31; the adjusting pad 35 is in interference fit with the output gear shaft 32, and the upper surface of the adjusting pad 35 abuts against the lower end surface of the bearing 33 to axially position the bearing seal cover 34.
Referring to fig. 9, the output gear shaft 32 is installed in the output housing 31 through a plurality of bearings 33, and the specific number, type, size, etc. of the bearings 33 are determined according to actual production requirements, and are not described herein again. Among the plurality of bearings 33, the bearing 33 relatively close to the bearing seal cover 34 is a lower end bearing.
The bearing sealing cover 34 is of an outwards-raised annular structure, the inner ring of the bearing sealing cover 34 is in clearance connection with the outer peripheral portion of the output gear shaft 32, the outer ring of the bearing sealing cover 34 is in interference fit with the inner wall surface of the mounting hole of the output box body 31, the outer ring of the bearing sealing cover 34 is in interference fit with the output box body 31 to achieve sealing of the inner cavity of the output box body 31, grease leakage of the bearing of the output end 3 is avoided on the one hand, and external dust and other impurities are prevented from entering on the other hand.
The upper end of the outer ring of the bearing sealing cover 34 is provided with an inward-bent rolling opening, and the specific radian and other dimensions of the rolling opening are determined according to the shape, the size and other factors of the lower end bearing in actual production, and are not described again.
The roll mouth is in interference fit with the outer ring end face of the lower end bearing, so that lubricating grease of the bearing 33 can be effectively sealed, and the lubricating grease is prevented from leaking from the edge of the bearing sealing cover 34, the edge of the output box body 31 and the edge of the output gear shaft 32.
In order to realize the smooth disassembly and assembly of the bearing sealing cover 34, the end face of the outer ring of the winding opening and the lower end bearing is usually arranged to be in large interference fit, and the mounting hole of the outer ring and the mounting hole of the output box body 31 are in small interference fit.
The interference fit between the output box 31 and the bearing sealing cover 34 and between the output gear shaft 32 and the bearing sealing cover 34 can be press fit at normal temperature or hot fit, and the specific assembling mode is determined according to the requirements in actual production.
Preferably, the radial clearance value between the bearing seal cover 34 and the output gear shaft 32 is set to be 1-2mm, and the radial clearance value is larger, so that the assembly of the bearing seal cover 34 and the adjusting pad 35 is facilitated.
The upper end face of the bearing sealing cover 34 is abutted with the end face of the inner ring of the lower end bearing, and the lower end face of the bearing sealing cover 34 is abutted with the upper end face of the adjusting pad 35, so that the axial positioning of the bearing sealing cover 34 is realized, and the axial movement of the bearing sealing cover 34 in the using process is avoided.
The adjusting pad 35 is sleeved on the outer periphery of the output gear shaft 32, and for facilitating positioning of the adjusting pad 35, please refer to fig. 10, the adjusting pad 35 is sleeved on the positioning journal of the output gear shaft 32, and the length of the adjusting pad 35 is the same as the length of the positioning journal.
In order to provide a better fit of the adjusting pad 35 with the output gear shaft 32, it is preferred that the inner ring of the adjusting pad 35 is provided with a chamfer having a dimension 0.5-1mm greater than the transition radius of the output gear shaft 32, so that the inner ring of the adjusting pad 35 can be brought into close abutment with the circumferential surface of the pilot journal of the output gear shaft 32.
The height of the positioning journal on the output gear shaft 32 and the size of the transition fillet are checked, calculated and determined according to the design strength requirement of the output gear shaft 32 in actual production, and are not described herein again.
In the embodiment, the bearing seal cover 34 is sleeved on the output gear shaft 32, and the rolling opening of the bearing seal cover 34 is in interference fit with the outer ring of the bearing 33, so that lubricating grease can be sealed; the outer ring of the bearing seal cover 34 is in interference fit with the mounting hole of the output box 31, so that the grease can be further sealed, the grease can be prevented from flowing out, and impurities such as external dust can be prevented from entering the output end 3.
One end of the bearing sealing cover 34 is abutted with the end face of the inner ring of the bearing 33, the other end of the bearing sealing cover is abutted with the upper end face of the adjusting pad 35, the axial position of the bearing sealing cover 34 is effectively limited, the bearing sealing cover 34 is prevented from moving axially, large stress concentration caused by the contact of the end face of the inner ring of the bearing 33 and the shaft shoulder of the output gear shaft 32 is also avoided, and the strength of the output gear shaft 32 is guaranteed.
Therefore, the output end sealing structure without the screw and the oil seal adopted by the embodiment compares with the sealing mode that the output end cover is fixed by the fastening screw and the output end cover is matched with the oil seal to seal the bearing of the output end in the prior art, so that the cost brought by accessories such as the screw and the oil seal is reduced, the overall height and quality of the output end 3 are reduced, and the risk of running stability caused by loosening and dropping of the screw is avoided.
To facilitate the installation of the adjustment pad 35, the output gear shaft 32 may preferably be provided with a transition taper for mating with the bearing seal cover 34 at an inclination angle of 45 °, the axial distance of the transition taper being 1/2 of the radial clearance value.
On the basis of the above embodiment, the bearing sealing cover 34 can be set as a rolled edge stamping part, which is formed by stamping a steel plate and the like, compared with the existing turning process of covering each hole groove on the output end, the production process is greatly simplified, and the production cost is reduced.
Preferably, the winding opening of the bearing sealing cover 34 may be a hardened surface, and the structural strength of the winding opening is increased by the hardening treatment, so that the abrasion of the winding opening caused by the vibration of the wind turbine nacelle and the like is reduced.
In addition to the above embodiments, considering that the upper end surface of the adjustment pad 35 abuts against the bearing seal cover 34, the surface of the adjustment pad 35 may be a hardened surface to reduce wear of the adjustment pad 35 and prolong the service life thereof.
On the basis of the above embodiment, the output gear shaft 32 may be a hollow structure, and the lower end surface of the output gear shaft 32 is provided with a lightening hole, so that the whole mass of the output end 3 and even the yaw gearbox is lightened through the lightening hole.
Referring to fig. 4, the lightening hole may be a circular truncated cone hole with an outer contour similar to that of the output gear shaft 32, and an axis of the lightening hole coincides with an axis of the output gear shaft 32, so as to prevent the center of gravity of the output gear shaft 32 from shifting.
Of course, the lightening holes may be provided as a plurality of blind holes evenly distributed in the circumferential direction to ensure that the center of gravity of the output gear shaft 32 remains on the axis of the output gear shaft 32.
The specific number, shape, size and arrangement position of the lightening holes need to be calculated and determined according to the shape, size and design strength requirements of the output gear shaft 32 in actual production, and details are not repeated herein.
To reduce forging costs and simplify subsequent machining operations, the lightening holes are typically formed during forging of the output gear shaft 32, rather than being machined by turning or the like after forging of the output gear shaft 32.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The yaw gearbox provided by the present invention has been described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A yaw gearbox comprises an input end, an output end and a multi-stage planetary gear structure, and is characterized in that the multi-stage planetary gear structure comprises at least one stage of single-arm planetary assembly, the single-arm planetary assembly comprises a planetary frame, a planetary shaft, a planetary wheel and a sun wheel meshed with the planetary wheel, the planetary frame and the planetary shaft are of an integrated structure, and the planetary wheel is sleeved on the planetary shaft through a bearing without an outer ring;
the planet shaft is provided with a positioning step used for being abutted against the lower end face of the outer ring-free bearing, the upper end face of the planet shaft is provided with a bending groove containing at least one bending bayonet, the bottom surface of the bending groove is lower than the upper end face of the planet wheel, and the outer wall face of the bending groove is outwards bent so as to axially position the upper end face of the outer ring-free bearing;
the up end of planet carrier be equipped with be used for with the wearing pad of the lower terminal surface contact of sun gear, the lower terminal surface of planet carrier be used for with output or next-level sun gear key-type connection.
2. The yaw gearbox of claim 1, wherein the input end includes an input box, a drive sleeve, a vent cap disposed at an upper end of the input box, and a filler plug disposed at a lower end of the input box;
the upper end of the transmission sleeve is used for being connected with a motor shaft, and the lower end of the transmission sleeve is connected with a first-stage sun gear of the multi-stage planetary gear structure so as to transmit the torque of the motor shaft to the multi-stage planetary gear structure;
the transmission sleeve is arranged in an inner cavity of the input box body, a positioning step is arranged at the top of the inner cavity of the input box body, and the positioning step is used for preventing the transmission sleeve from axially moving and detecting and controlling the axial total gap of the input end.
3. The yaw gearbox of claim 2, wherein the drive sleeve is splined to the motor shaft.
4. The yaw gearbox of claim 2, wherein the drive sleeve is in toothed connection with the primary sun.
5. The yaw gearbox of claim 1, wherein the output end comprises an output box body, an output gear shaft, a bearing sealing cover and an adjusting pad, the output gear shaft is sequentially sleeved with the bearing, the bearing sealing cover and the adjusting pad from top to bottom, the upper end face of the bearing sealing cover is abutted against the end face of an inner ring of the bearing, and the inner ring of the bearing sealing cover is in clearance fit with the output gear shaft;
the outer ring of the bearing sealing cover is higher than the inner ring of the bearing sealing cover, the upper end of the outer ring of the bearing sealing cover is provided with an inward-bent rolling opening, the rolling opening is in interference fit with the end face of the outer ring of the bearing, and the outer ring of the bearing sealing cover is in interference fit with the mounting hole of the output box body;
the adjusting pad is in interference fit with the output gear shaft, and the upper surface of the adjusting pad is abutted to the lower end face of the bearing so as to axially position the bearing sealing cover.
6. The yaw gearbox of claim 5, wherein an inner race of the adjustment pad is provided with a chamfer having a dimension that is 0.5-1mm greater than a dimension of a transition fillet of the output gear shaft.
7. The yaw gearbox of claim 5, wherein the output gear shaft is a hollow structure, and a weight-reducing hole is formed in a lower end face of the output gear shaft.
8. A yaw gearbox according to any one of claims 1-7, wherein the wear pad is in the form of a flat plate, the wear pad being in interference connection with the planet carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111660634.6A CN114278718A (en) | 2021-12-30 | 2021-12-30 | Yaw gear box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111660634.6A CN114278718A (en) | 2021-12-30 | 2021-12-30 | Yaw gear box |
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| CN114278718A true CN114278718A (en) | 2022-04-05 |
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| CN202111660634.6A Pending CN114278718A (en) | 2021-12-30 | 2021-12-30 | Yaw gear box |
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