Supporting device for output shaft of speed reducer of wind generating set

Abstract

The utility model relates to a supporting device for a speed reducer output shaft of a wind generating set, which comprises an output gear shaft, the contact part of the output gear shaft and an output end planet carrier is in a similar circular truncated cone shape, a taper hole matched with the output gear shaft is arranged in the output end planet carrier, and the output gear shaft is connected with the output end planet carrier in a conical interference fit mode. A double-row reducing four-point contact ball bearing is arranged between the output end planet carrier structure and the lower box body, a baffle is further arranged above the output gear shaft and used for fixed connection, the baffle is connected with the output gear shaft through a fastening bolt, and the baffle is in interference fit with the output end planet carrier. The double-row reducing four-point contact ball bearings are adopted for fixing and supporting, the supporting rigidity and the bearing capacity of the speed reducer are improved, the height of the whole machine is reduced, and the space occupancy rate of the speed reducer in a hub is reduced; the coaxiality of the inner ring and the outer ring is ensured while the contact surface is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to a speed reducer component technical field especially is related to a wind generating set speed reducer output shaft's supporting device. BACKGROUND

[0002] Wind generating set speed reducer all contain input output shaft, wherein the output shaft is the main shaft that is driven outside after the reduction, it is responsible for adjusting the angle of wind generating set blade, to adapt to the change of different wind speed, ensure the stable operation and high -efficient power generation of wind generating set. Wind generating set is used variable pitch speed reducer, is installed in the wheel hub, and rotates 360 degrees with the wheel hub in the air, because the wheel hub space is limited, the volume of the variable pitch speed reducer that can be accommodated is limited, but the current conventional variable pitch speed reducer, usually adopts two sets of taper roller bearings fixed speed reducer's output shaft of back to back installation, because the taper roller bearing volume is big, simultaneously guarantees the reliability of taper roller bearing, therefore the output end of speed reducer needs higher size, this leads to the overall height size of speed reducer is higher. Through the retrieval, the same technical scheme as the utility model is not found, only some relevant comparison technical documents are found, mainly have the following:

[0003] 1. The patent with the application number 202211369971.4 discloses a wind power yaw variable pitch speed reducer output shaft structure, which comprises an output gear shaft, a shell, a bearing, a cylindrical roller bearing arranged on the upper end of the output gear shaft, and a self-lubricating sliding bearing arranged on the lower end of the output gear shaft; the cylindrical roller bearing and the self-lubricating sliding bearing are arranged outside the bearing seat shell; the lower end of the invention adopts a self-lubricating sliding bearing, and the upper bearing adopts a cylindrical roller bearing arrangement structure; the self-lubricating sliding bearing directly transmits the bending moment of the cantilever support gear to the box through the axial large contact surface. Although the patent reduces the transverse size of the speed reducer by using cylindrical roller bearings and self-lubricating sliding bearings, the vertical size of the self-lubricating sliding bearing cannot be reduced, so the aforementioned problems still exist, and the use of cylindrical roller bearings and self-lubricating sliding bearings for fixing and supporting has the problem of limited stress area, and the cylindrical roller bearings and self-lubricating sliding bearings are prone to deformation or fatigue damage.

[0004] 2、Patent No. 202321451635.4 provides a yaw variable pitch reducer output end structure and a wind power equipment, the disclosed output end structure includes a box, an output shaft, a cylindrical roller group and an axial positioning bearing, part of the output shaft is located in the box, the cylindrical roller group includes a plurality of cylindrical rollers, the plurality of cylindrical rollers are arranged around the output shaft, the output shaft is rotatably connected with the box through the cylindrical roller group, the cylindrical roller group is used for bearing the radial force of the output shaft, the axial positioning bearing is sleeved on the outer periphery of the output shaft, and the axial positioning bearing is used for bearing the axial force of the output shaft. Although the cylindrical rollers are arranged around the output shaft to reduce the size of the reducer, the contact area between the cylindrical rollers and the output shaft is limited, deformation or fatigue damage is prone to occur, and if multiple cylindrical rollers are arranged to increase the contact area, the size of the reducer will increase, so improvement is still needed.

[0005] 3、Patent No. 202322649995.1 provides a gear shaft structure for wind power yaw variable pitch reducer, comprising an output gear and a shaft, the output gear is sleeved on the shaft, the output gear is provided with a spline, one end of the spline is provided with a light hole, and the other end is provided with a positioning end face; the output gear and the shaft are connected through the spline, and the output gear is interference fit with the shaft through the light hole; the end face of the shaft is provided with a positioning end cover connected through a screw, the positioning end cover is provided with a convex stop, the stop is interference fit on the shaft, and the end face of the stop abuts against the positioning end face. The patent does not solve the problem of oversize reducer.

[0006] Through the analysis of the above-mentioned patents, it can be found that although the current wind power variable pitch reducer output shaft has the method of reducing the size of the reducer by arranging cylindrical rollers around the output shaft, the problem of limited contact area between the cylindrical rollers and the output shaft, which is prone to deformation or fatigue damage, has not been considered. Therefore, the problems described above still exist, and it is necessary to improve them. Utility model content

[0007] The technical problem to be solved by the utility model is to provide a support device for a wind turbine generator set reducer output shaft, which has a smaller volume than conventional wind power variable pitch reducer output shaft support devices, reduces the space occupancy rate of the reducer output shaft support device in the hub, is easy to install, and improves the support stiffness and carrying capacity of the reducer.

[0008] The utility model discloses a technical scheme is: a kind of wind turbine generator system reduction gear output shaft's supporting device, including output gear shaft, output end planetary carrier, lower box, rolling body component one and rolling body component two;Output gear shaft is installed in the planetary carrier output shaft hole of output end planetary carrier, and output end planetary carrier is again installed in the lower box output shaft hole of lower box by rolling body component one and rolling body component two, and rolling support to output gear shaft is formed;At least one of the rolling body component one and rolling body component two is four-point contact ball bearing, and the rolling body of four-point contact ball bearing is filled into raceway by perfusion hole on output end planetary carrier, and double spherical surface spacer is provided between each rolling body, and a kind of compact four-point contact ball bearing support structure is formed in raceway by rolling body and spacer combination in raceway.

[0009] Further, the rolling body and spacer are staggered in raceway, form a rolling body ring in raceway, and the rolling body and raceway form four-point contact in the raceway in output end planetary carrier and the outer raceway in lower box.

[0010] Further, the gap between raceway in output end planetary carrier and outer raceway in lower box is controlled at 1-2mm, to ensure that the contact angle of four-point contact formed by rolling body and raceway in output end planetary carrier and outer raceway in lower box is greater than 25 degrees.

[0011] Further, the two sides of the spacer are double concave arc groove that is fitted with rolling body, and the double concave arc groove is provided with concave arc groove on the outside of two concave arcs.

[0012] Further, plug is provided at perfusion hole on output end planetary carrier, plug adopts conical column structure that is matched with the size of perfusion hole, one end side of plug conical column structure is arc-shaped that is matched with bearing inner raceway arc of raceway, the other end is circular arc that is matched with positioning pin, positioning pin extends into perfusion hole from the side of perfusion hole, and the outer surface of positioning pin is abutted against plug, to realize the axial, radial and circumferential positioning of plug.

[0013] Further, the positioning pin and output end planetary carrier adopt interference connection, and the threaded hole for disassembly is formed in the center position of positioning pin, to facilitate disassembly during later maintenance, the front end of positioning pin adopts conical structure, to facilitate plug positioning, the diameter of positioning pin is greater than the maximum external dimension of plug, to ensure that plug can be normally installed.

[0014] Further, the output gear shaft and the output end planetary carrier contact part are conical table shapes, the output end planetary carrier has a tapered hole matched with the output gear shaft, the end gear is arranged on the output gear shaft, the end gear is inserted into the inner gear of the output end planetary carrier, and the end gear is blocked by the baffle plate which is fixed on the end of the output gear shaft by the fastening bolt.

[0015] Further, the bottom of the output end planetary carrier is sealed by the oil seal, the bottom of the connecting bolt between the baffle plate and the output gear shaft is installed with the copper sealing pad to realize sealing, and the reliability of the reducer sealing is guaranteed.

[0016] Further, the four-point contact ball bearing is a double-row four-point contact ball bearing, which comprises bearing raceway one, bearing raceway two, rolling element assembly one arranged in the bearing raceway one and rolling element assembly two arranged in the bearing raceway two.

[0017] Further, the rolling element diameter of the rolling element assembly one is larger than that of the rolling element assembly two, so that the double-row four-point contact ball bearing with different diameters is formed.

[0018] The beneficial effects of the utility model are as follows: (1) the variable pitch reducer integrates the double-row four-point contact ball bearing with different diameters, improves the support stiffness and bearing capacity of the reducer, reduces the overall height of the reducer, and reduces the space occupancy rate of the reducer in the hub. (2) the rolling element assembly is filled with rolling elements through the filling hole and is isolated by the double-face inner arc-shaped curved surface isolation pad, so that the radial size of the whole rolling element assembly can be effectively reduced, the overall structure weight and volume are greatly reduced, and subsequent assembly and transportation are facilitated. (3) since the rolling elements are filled, not only the radial size of the rolling assembly can be reduced, but also the gap between the inner raceway of the output end planetary carrier and the outer raceway in the lower box body can be reduced, so that the contact length of the rolling elements and the raceway can be lengthened, the four-point contact can be changed, and the four-point contact ball bearing can bear force better. (4) the volume of the inner cavity of the variable pitch reducer is reduced, and the amount of lubricating oil can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of a support device of a reducer output shaft of a wind turbine generator set provided by the utility model embodiment.

[0020] Figure 2 is a structural schematic view of a bearing inner raceway.

[0021] Figure 3 is a structural schematic view of a rolling element assembly.

[0022] Figure 4 is a structural schematic view of an isolation block.

[0023] Figure 5 is a structural schematic view of an output gear shaft.

[0024] Figure 6is a schematic diagram of a perspective structure of an output gear shaft.

[0025] Figure 7 is a schematic diagram of a perspective structure of a plug.

[0026] Explanation of reference numerals: output gear shaft 1, oil seal 2, output end carrier 3, inner raceway 301, rolling element assembly one 4, lower box 5, outer raceway 501, baffle 6, rolling element assembly two 7, gasket 8, fastening bolt 9, plug two 10, positioning pin one 11, threaded hole 1101, plug one 12, bearing inner raceway arc 1201, circular arc 1202, positioning pin two 13, spacer 14, spacer arc surface 1401, rolling element 15, raceway 16. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in detail with specific examples. Other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the specification. The present application can also be implemented or applied in other different embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application. It should be noted that the drawings provided in the following examples only schematically illustrate the basic concept of the present application, and the features in the following examples and embodiments can be combined with each other without conflict.

[0028] It should be noted that the drawings are only used for illustrative description, and the representation is only a schematic diagram, not a physical diagram, and should not be understood as a limitation of the present application. In order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some known structures and their descriptions in the drawings may be omitted.

[0029] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the positional relationship in the drawings are only used for illustrative description, and should not be understood as a limitation of the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] As Figures 1-7As shown, a wind power variable pitch speed reducer output shaft support includes an output gear shaft 1, an output end carrier 3, a lower box body 5, the output gear shaft 1 is fixedly installed in the output end carrier 3 and is supported by the output end carrier 3; the output end carrier 3 is further supported on the lower box body 5 by rolling body assembly one 4 and rolling body assembly two 7, and is a kind of rotatable rotary support in shape; the contact part of the output gear shaft 1 and the output end carrier 3 is a circular truncated cone, the output end carrier 3 has a tapered hole for cooperating with the output gear shaft, a double-row different-diameter four-point contact ball bearing is arranged between the structure of the output end carrier 3 and the lower box body 5, two positioning pins are arranged on the output end carrier 3, a plug is arranged between the double-row different-diameter four-point contact ball bearing and the positioning pin, the plug adopts a conical structure, one side of the plug one 12 is an arc-shaped bearing inner raceway 1201, the other side is processed into a circular arc 1202 and cooperates with the positioning pin to realize axial, radial and circumferential positioning of the plug.

[0031] Further, the two positioning pins are divided into positioning pin one 11 and positioning pin two 13, and are connected with the output end carrier 3 by interference, threaded holes 1101 are formed in the center positions of the two positioning pins, which facilitates disassembly during later maintenance, the front ends of the positioning pins adopt a conical structure, which facilitates positioning of the plug one 12 and the plug two 10, the diameter of the positioning pin one 11 is greater than the maximum outer dimension of the plug, so as to ensure that the plug can be normally installed.

[0032] Further, the plug is divided into plug one 12 and plug two 10, the plug one 12 and the plug two 10 are completely same in shape, but the plug one 12 is larger than the plug two 10, the plug one 12 is installed on one side of the positioning pin two 13, and the plug two 10 is installed on one side of the positioning pin one 11.

[0033] Further, a baffle 6 is further arranged above the output gear shaft 1 for fixed connection, and the baffle 6 is connected with the output gear shaft 1 by fastening bolts 9.

[0034] Further, the double-row different-diameter four-point contact ball bearing includes bearing raceway one, bearing raceway two, rolling body assembly one 4 installed in the bearing raceway one and rolling body assembly two 7 installed in the bearing raceway two.

[0035] Further, the rolling body assembly is composed of rolling bodies and isolation blocks 14, the diameter of the rolling bodies 15 of the rolling body assembly one 4 is greater than that of the rolling bodies 15 of the rolling body assembly two 7.

[0036] Further, the rolling bodies 15 and the isolation blocks 14 are arranged in the raceway in a staggered manner, an annular rolling body ring is formed in the raceway 16, and the rolling bodies 15 form four-point contact with the output end carrier inner raceway 301 and the lower box body outer raceway 501.

[0037] Further, a gap is left between the inner raceway 301 of the output planetary carrier and the outer raceway 501 in the lower box, and the gap H is controlled to be 1-2mm, so that the contact length of the rolling body 15 with the inner raceway 301 of the output planetary carrier and the outer raceway 501 in the lower box can be lengthened, so as to ensure that the contact angle of the four-point contact of the rolling body with the inner raceway 301 of the output planetary carrier and the outer raceway 501 in the lower box is greater than 25 degrees.

[0038] Further, the isolation block 14 is provided with an arc-shaped groove 1401 on both sides and is fitted with the rolling body.

[0039] Further, the bearing raceway one is arranged near the output gear, and the bearing raceway two is arranged near the baffle 6.

[0040] Further, the output planetary carrier 3 is provided with internal splines between the baffle 6 mounting hole and the output gear shaft matching taper hole, the output gear shaft 1 is provided with external splines on the outer side of the contact bottom end of the output planetary carrier 3, and the output planetary carrier 3 and the output gear shaft 1 are connected in a spline connection mode to transmit torque, so as to ensure the stability of torque transmission.

[0041] Further, the bottom of the output planetary carrier 3 is sealed by the oil seal 2, and the bottom of the connecting bolt of the baffle 6 and the output gear shaft 1 is sealed by the pure copper sealing gasket 8, so as to ensure the reliability of the reducer sealing.

[0042] In the embodiment, the assembly process is as follows: first, the output planetary carrier 3 is placed into the lower box 5 from top to bottom, then the rolling body two 7 and the isolation block are filled into the bearing raceway from the rolling body mounting hole two one by one, one isolation block is placed every other rolling body, until all the rolling bodies and the isolation blocks are filled; the plug two 10 and the positioning pin two 11 are installed in place; the assembled lower box and the output planetary carrier are turned over by 180°, and the rolling body two 4 and the isolation block are sequentially filled; the plug one 12 and the positioning pin one 13 are installed in place, and the oil seal 2 and the positioning baffle ring are installed in the lower box 5; the lower box and the output planetary carrier assembled in the above steps are taken as an assembly, and are hoisted as a whole, and are installed from top to bottom from the small head of the output gear shaft 1, the output planetary carrier and the output gear shaft splines are aligned, the output gear shaft and the output planetary carrier taper surface are fitted by using gravity, and the output gear shaft is installed in place, and the remaining parts can be installed in a conventional manner.

[0043] The beneficial effects of the utility model are as follows:

[0044] (1) The variable-pitch reducer supporting device adopts integrated double-row different-diameter four-point contact ball bearings, improves the supporting stiffness and bearing capacity of the reducer, reduces the overall height of the machine, and reduces the space occupancy rate of the reducer in the hub.

[0045] (2) The rolling body assembly adopts the method of pouring the rolling body through the pouring hole and isolating through the double-face inner arc-shaped curved surface isolation pad, which can effectively reduce the radial size of the whole rolling body assembly, greatly reduces the overall structure weight and volume, and facilitates subsequent assembly and transportation.

[0046] (3) Since the rolling body is poured, not only the radial size of the rolling assembly can be reduced, but also the gap between the inner raceway of the output end planetary carrier and the outer raceway in the lower box body can be reduced, which can lengthen the contact length of the rolling body and the raceway, change the four-point contact, and make the four-point contact ball bearing better bear the force.

[0047] (4) The volume of the internal cavity of the variable pitch speed reducer is reduced, which can reduce the amount of lubricating oil.

[0048] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A support device for the output shaft of a wind turbine generator reducer, comprising an output gear shaft (1), an output end planetary carrier (3), a lower housing (5), a first rolling element assembly, and a second rolling element assembly (7); the output gear shaft (1) is installed in the output shaft hole of the planetary carrier of the output end planetary carrier (3), and the output end planetary carrier (3) is installed in the output shaft hole of the lower housing (5) of the lower housing (5) through the first rolling element assembly and the second rolling element assembly (7), forming a rolling support for the output gear shaft (1); characterized in that: At least one of the rolling element assembly one and rolling element assembly two (7) is a four-point contact ball bearing, and the rolling element (15) of the four-point contact ball bearing is filled into the raceway (16) through the filling hole on the planetary carrier (3) at the output end. A double spherical isolation block (14) is provided between each rolling element (15). The rolling element (15) and the isolation block (14) are combined in the raceway (16) to form a compact four-point contact ball bearing support structure.

2. The support device for the output shaft of a wind turbine generator reducer according to claim 1, characterized in that: The rolling element (15) and the isolation block (14) are staggered and arranged in the raceway (16) to form a ring of rolling elements in the raceway (16). The rolling element (15) forms a four-point contact with the raceway (301) in the planetary carrier (3) at the output end of the raceway (16) and the outer raceway (501) in the lower housing (5).

3. The support device for the output shaft of a wind turbine generator reducer according to claim 1, characterized in that: The gap between the inner raceway (301) of the output planetary carrier (3) and the outer raceway (501) in the lower housing (5) is controlled at 1-2 mm to ensure that the contact angle of the rolling element (15) and the inner raceway (301) of the output planetary carrier (3) and the outer raceway (501) in the lower housing (5) is greater than 25 degrees.

4. The support device for the output shaft of a wind turbine generator reducer according to claim 1, characterized in that: The isolation block (14) has double concave arc surface grooves on both sides that fit with the rolling body (15). The double concave arc surface grooves are provided at both ends of the isolation block (14). The two concave arc surface grooves are connected back to back, and concave grooves are provided on the outside of the two concave arc surfaces.

5. The support device for the output shaft of a wind turbine generator reducer according to claim 1, characterized in that: A plug is provided at the injection hole on the planetary carrier (3) at the output end. The plug adopts a conical columnar structure that matches the size of the injection hole. One end of the conical columnar structure of the plug is an arc that matches the inner raceway (301) of the bearing raceway (16), and the other end is an arc that matches the positioning pin. The positioning pin extends into the injection hole from the side of the injection hole and presses against the plug with the outer surface of the positioning pin to achieve axial, radial and circumferential positioning of the plug.

6. The support device for the output shaft of a wind turbine generator reducer according to claim 5, characterized in that: The positioning pin and the output planetary carrier (3) are connected by interference fit. The center of the positioning pin is provided with a threaded hole (1101) for disassembly, which is convenient for disassembly during later maintenance. The front end of the positioning pin is a tapered structure, which is convenient for positioning the plug. The diameter of the positioning pin is larger than the maximum outer size of the plug, which ensures that the plug can be installed normally.

7. A support device for the output shaft of a wind turbine generator reducer according to claim 5, characterized in that: The contact portion between the output gear shaft (1) and the output planetary carrier (3) is truncated cone-shaped. The output planetary carrier (3) has a tapered hole for the output gear shaft (1) to fit. The output gear shaft (1) is provided with end teeth, which are inserted into the internal teeth of the output planetary carrier (3) and blocked by a baffle (6). The baffle (6) is fixed to the end of the output gear shaft (1) by fastening bolts (9).

8. A support device for the output shaft of a wind turbine generator reducer according to claim 5, characterized in that: The bottom of the output planetary carrier (3) is sealed with an oil seal (2), and a pure copper sealing gasket (8) is installed at the bottom of the connecting bolt between the baffle (6) and the output gear shaft (1) to ensure the reliability of the reducer seal.

9. A support device for the output shaft of a wind turbine generator reducer according to claim 1, characterized in that: The four-point contact ball bearing is a double-row four-point contact ball bearing, including bearing raceway one, bearing raceway two, rolling element assembly one installed in bearing raceway one, and rolling element assembly two installed in bearing raceway two (7).

10. A support device for the output shaft of a wind turbine generator reducer according to claim 1, characterized in that: The diameter of the rolling element (15) of the first rolling element assembly is larger than that of the rolling element (15) of the second rolling element assembly (7), forming a double-row, different diameter, four-point contact ball bearing.

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