A yaw reducer having a composite rolling bearing body

Abstract

The utility model discloses a yaw speed reducer with composite rolling bearing body, including motor, speed reducer main part and output mechanism, and speed reducer main part includes speed reducer casing and speed reducer unit, and the one end of output shaft is equipped with the output gear, and the other end is equipped with the connecting spline, and the contact surface of inner ring body and mounting seat inner ring is equipped with three side -by -side arrangement's raceway, and the V type groove of upper layer raceway is fully filled with cross rolling body, and the lower two raceways are fully filled with the circumferential arrangement of rolling body. The utility model discloses cross rolling body in the upper layer raceway of composite rolling bearing body, and the inner ring body rotates in axial and radial direction support, and the bottom two layers raceway of inner ring body and mounting seat constitutes and is fully filled with rolling body, and the axis of rolling body is parallel with the axis of inner ring body and mounting seat, further improved the overall rigidity, reached the combination of satisfying the rotation accuracy and small cross section height simultaneously, satisfied the compact of structure, improved the bearing capacity, reduced the manufacturing cost requirement.

Description

Technical Field

[0001] This invention relates to the field of speed reducer technology, and more specifically, to a yaw speed reducer with a composite rolling bearing housing. Background Technology

[0002] Wind turbine generator sets include a yaw system, which uses the motor to rotate the nacelle so that the rotor faces the wind. The yaw system includes the motor, yaw reducer, yaw bearing, yaw brake disc, and yaw brake. Traditional yaw reducers are usually planetary gear reducers, supported by two tapered roller bearings, and are widely used due to their high transmission accuracy and efficiency. However, because their single-stage transmission ratio is small, multiple stages need to be connected in series to make reducers with larger transmission ratios. Furthermore, the current common use of planetary carriers with planetary shafts fixed at both ends unnecessarily occupies too much axial space, resulting in excessively long axial lengths in existing multi-stage planetary reducers. This leads to low material utilization, high manufacturing costs, and a significant reduction in transmission rigidity and accuracy. In addition, the excessive axial length makes installation impossible in many fields or situations, further limiting the widespread application of this reducer.

[0003] Patent publication number CN 117108723 A discloses a compact planetary gear reducer with a large transmission ratio, such as... Figure 3 As shown, the system includes a motor, a reduction mechanism, and an output mechanism. The reduction mechanism includes a reducer housing and an Nth-stage star gear reduction mechanism arranged sequentially along the axial direction of the reducer housing. Each stage of the star gear reduction mechanism includes a star gear carrier, a sun gear, and a star gear shaft. The output mechanism includes an output shaft, with a final-stage star gear carrier fixed at one end of the output shaft. The final-stage star gear carrier and the output shaft are integrally formed. An output gear is mounted on the output shaft, and the output gear and the output shaft are rigidly connected by an interference fit through a toothed spline and a conical two-section structure. The first-stage star gear reduction mechanism includes a final-stage star gear carrier and a final-stage star gear assembly. A reduction housing is fitted onto the final-stage star gear carrier, a final-stage gear ring is mounted on the reducer housing, and a final-stage star gear shaft is mounted on the final-stage star gear carrier. A final-stage sun gear is mounted on the final-stage star gears.

[0004] The aforementioned reducer has a complex structure. The inner ring of the bearing also serves as the planetary carrier of the planetary reducer to transmit torque. Although this achieves the purpose of a compact structure, the protruding star shaft is supported by a cantilever beam. When the load torque is large, the risk of root fracture is extremely high. The bearings in its mounting part use traditional ball rollers, which are numerous and have a high failure rate. If one of the rollers fails, the entire device may become unusable. At the same time, its radial load capacity is small. Therefore, it is not suitable for high torque reduction and is only suitable for low torque reduction equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a high-strength, compact yaw reducer with a composite rolling element bearing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A yaw reducer with a composite rolling bearing housing includes a motor, a reducer body, and a composite rolling bearing housing. The motor is connected to the composite rolling bearing housing via the reducer body. The reducer body includes a reducer housing and a reducer unit. The reducer unit is located inside the reducer housing and includes an N-stage planetary gear assembly. The drive shaft of the motor is connected to the N-stage planetary gear mechanism via a sun gear. An internal gear ring is provided on the outside of the N-stage planetary gear assembly, and the outer circumference of the internal gear ring is shared by multiple stages. The bottom surface of the shared gear ring of the reducer housing is connected to the upper plane of the last stage gear ring, and the last stage internal gear ring is connected to the upper plane of the composite rolling bearing housing. The N-stage planetary gear assembly... The star wheel assembly includes planetary gears, bearings, planetary shafts, and a final stage star carrier. The composite rolling bearing housing includes an output gear shaft, an inner ring body, and a mounting base. One end of the output gear shaft is connected to the final stage star carrier via a connecting key. The output gear shaft is externally sleeved within the inner ring body and inserted into a stepped hole in the inner ring body. Its upper end is locked with a nut. The mounting base is annular and located on the outer periphery of the inner ring body. Three parallel raceways are provided between the inner ring body and the inner ring of the mounting base. Crossed rolling elements are installed in the upper raceway and are located within the raceway between the mounting base and the inner ring body. The lower two raceways are fully filled with rolling elements. The inner ring body and the mounting base are in rolling contact through the rolling elements. The mounting base is fixedly connected to the reducer housing.

[0007] Preferably, the inner ring body and the upper raceway of the mounting base are composed of two V-shaped raceways, in which rolling elements a are arranged in a cross pattern. The rolling elements a are cylindrical rollers, and adjacent cylindrical rollers are arranged perpendicularly to each other at 90° in the V-shaped raceways. The axis of the rolling element a intersects the axis of the inner ring body at 45°.

[0008] Preferably, the inner circumferential surface of the mounting base is provided with an inner raceway a, and the inner circumference of the intermediate raceway between the inner raceway a and the outer circumference of the inner ring is fully equipped with rolling elements b, which are cylindrical rollers. The rolling elements b are installed in the □-shaped groove of the inner raceway of the mounting base, and the inner ring has no upper or lower retaining edges.

[0009] Preferably, the lower layer of the inner circumferential surface of the mounting base is provided with an inner raceway b, and the lower layer of the outer circumference of the inner ring is provided with an outer raceway. The inner raceway b and the outer circumferential raceway are semi-circular, and the axis of the semi-groove is allowed to have an inclination angle of 0-4″ with respect to the inner hole direction of the bottom plane. The inner circumference of the lower raceway between the mounting base and the inner ring is fully filled with rolling elements c, which are cylindrical rollers. The rolling elements c are respectively installed in the semi-circular grooves of the mounting base and the inner ring, and are in full contact with the mounting base and the inner ring. The mounting base and the inner ring have retaining edges on the top and bottom.

[0010] Preferably, each planetary gear in the final stage planetary gear mechanism is equipped with a self-lubricating sliding wear-resistant body. The self-lubricating sliding wear-resistant body is cylindrical and ring-shaped, made of copper-based alloy material. The outer diameter of the self-lubricating sliding wear-resistant body is interference-fitted with the planetary gear, and the inner diameter is clearance-fitted with the planetary shaft. The self-lubricating sliding wear-resistant body is installed and fixed in the hollow middle of the final stage planetary carrier through the planetary shaft.

[0011] Preferably, the top surface of the mounting base has threaded holes evenly spaced in a circular shape near the edge. The mounting base is fixedly connected to the reducer housing by bolts in the outer threaded holes. The outer side of the mounting base has an integral ring rib with multiple mounting holes evenly spaced in a circular shape on its surface.

[0012] Preferably, the upper and lower ends of the raceway of the contact surface between the mounting base and the inner ring body are sealed with oil seals.

[0013] Preferably, the mounting base has an oil hole radially opened in the outer diameter direction of the raceway, and an oil injection nozzle is installed at the outer end of the oil hole.

[0014] Preferably, the external gear ring in the reducer unit is shared across stages one, two, and three. Compared with the prior art, the advantages of this utility model are: This invention replaces traditional rolling bearings with self-lubricating sliding bearings in the final stage planetary gear mechanism, achieving high load capacity and long service life. Simultaneously, the thin-walled design of the sliding bearing reduces the overall structural volume, improves wear resistance, increases load-bearing pressure, reduces operating noise, and allows for a wide operating temperature range of -190°C to 300°C. The mounting base employs a composite rolling bearing body structure, significantly reducing the overall height. The composite rolling bearing body utilizes three rows of rolling elements, consisting of an inner ring and the mounting base, maintaining higher rigidity and strength while resulting in a more compact structure. The upper track uses a cross-rolling element structure, capable of withstanding axial loads, radial loads, and overturning moments, while minimizing the overall dimensions, achieving high transmission precision and rigidity, and meeting the requirements for high load capacity. The lower two rolling element structures facilitate assembly and disassembly, reducing thermal deformation. This achieves a perfect combination of high rotational precision and a small cross-sectional height, meeting the requirements of structural compactness, increased load capacity, and reduced manufacturing costs. In the final stage planetary gear mechanism, each planetary gear is designed and equipped with a self-lubricating sliding wear-resistant body. The outer diameter of the self-lubricating sliding wear-resistant body is interference-fitted with the planetary gear, while the inner diameter is clearance-fitted with the planetary shaft. This sliding wear-resistant body features a thin-walled design, small structural volume, high load-bearing capacity, and good impact resistance. It incorporates a thickened wear-resistant layer internally, resulting in a long service life, excellent wear resistance, low operating noise, and self-lubricating properties, leading to a low failure rate. It completely replaces traditional rolling bearings, significantly reducing the overall height of the yaw reducer, minimizing its size and weight, thereby lowering costs and meeting the installation requirements of confined spaces. Compared with existing bearings that use steel balls, the composite rolling bearing housing adopts a cylindrical roller layout for all rolling elements. This composite rolling bearing housing has the advantages of greater load-bearing capacity, convenient processing, simple structure, and durability. Since the number of cylindrical rollers is significantly less than twice the number of steel balls, the failure rate is low. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of the yaw reducer with a composite rolling bearing body according to the present invention; Figure 2 This is a cross-sectional view of the inner ring of the present invention; Figure 3 This is a structural diagram of a gear reducer in the prior art; Figure 4 This is a structural diagram of the final stage of the star system. Detailed Implementation

[0017] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0018] See Figure 1 , Figure 2 and Figure 3As shown, this invention provides a yaw reducer with a composite rolling bearing housing, including a motor 7, a reducer body, and a composite rolling bearing housing. The motor 7 is connected to the composite rolling bearing housing via the reducer body. The reducer body includes a reducer housing and a reducer unit, which is located inside the reducer housing. The reducer unit includes an N-stage planetary gear assembly 8. The drive shaft of the motor 7 is connected to the N-stage planetary gear assembly 8 via a sun gear. An internal gear ring is provided on the outer surface of the N-stage planetary gear assembly 8, and the outer circumference of the internal gear ring is shared by multiple stages. The bottom surface of the shared gear ring of the reducer housing is connected to the upper plane of the final stage gear ring, and the final stage internal gear ring is connected to the upper plane of the composite rolling bearing housing. The N-stage planetary gear assembly includes planetary gears 84, bearings, planetary shafts 82, and a final stage planetary carrier 81. The composite rolling bearing housing includes an output gear shaft 1, an inner ring body 3, and a mounting base 6. One end of the output gear shaft 1 is connected to the final stage star carrier 81 via a connecting spline 21. The output gear shaft 1 is sleeved inside the inner ring body 3. The output gear shaft 1 is installed into the stepped hole 33 of the inner ring body, and its upper end is locked by a nut. The mounting seat 6 is annular and located on the outer circumference of the inner ring body 3. There are three parallel raceways between the inner ring body 3 and the inner ring of the mounting seat 6. Crossed rolling elements are installed in the upper raceway and are set in the raceway between the mounting seat 6 and the inner ring body 3. The lower two raceways are fully filled with rolling elements, which can increase the contact area and increase the load-bearing capacity. While improving rigidity and precision, it also reduces friction torque and reduces deformation of the raceway surface. It has high rigidity and strength, ensures stable rotational performance, and can withstand large torque. The inner ring body 3 and the mounting seat 6 are in rolling contact through the rolling elements. The mounting seat 6 is fixedly connected to the reducer housing.

[0019] In this embodiment, the inner ring body and the upper raceway of the mounting base 6 are composed of two V-shaped raceways 5, which are provided with intersecting rolling elements a. The rolling elements a are cylindrical rollers, and adjacent cylindrical rollers are arranged perpendicularly to each other at 90° in the V-shaped raceway. The axis of the rolling element a intersects the axis of the inner ring body at 45°.

[0020] In this embodiment, the inner circumferential surface of the mounting base 6 is provided with an inner raceway a. The inner circumference of the intermediate raceway between the inner raceway a of the mounting base 6 and the outer circumference of the inner ring body 3 is fully equipped with rolling elements b. The rolling elements b are cylindrical rollers. The rolling elements b are installed in the □-shaped groove of the inner raceway of the mounting base 6. The inner ring body 3 has no upper or lower retaining edges.

[0021] In this embodiment, the lower layer of the inner circumferential surface of the mounting base 6 is provided with an inner raceway b, and the lower layer of the outer circumference of the inner ring body 3 is provided with an outer raceway 9. The inner raceway b and the outer raceway 9 are semi-□-shaped, and the axis of the semi-groove is allowed to have an inclination angle of 0-4″ with respect to the inner hole direction of the bottom plane. The inner circumference of the lower raceway between the mounting base 6 and the inner ring body 3 is fully filled with rolling elements c. The rolling elements c are cylindrical rollers and are in full contact with the mounting base 6 and the inner ring body 3. The mounting base 6 and the inner ring body 3 have retaining edges on the top and bottom.

[0022] like Figure 4 As shown in this embodiment, each planetary gear 84 in the final stage planetary gear mechanism is equipped with a self-lubricating sliding wear-resistant body 83. The self-lubricating sliding wear-resistant body 83 is a cylindrical ring made of copper-based alloy. The outer diameter of the self-lubricating sliding wear-resistant body 83 is interference-fitted with the planetary gear 84, and its inner diameter is clearance-fitted with the planetary shaft 82. The self-lubricating sliding wear-resistant body 83 is installed and fixed in the hollow middle of the final stage planetary carrier through the planetary shaft 82. The self-lubricating sliding wear-resistant body 83 has a small structure, high load-bearing capacity, and good impact resistance. It adopts a wear-resistant thickened layer inside, has a long service life, good wear resistance, low working noise, and self-lubricating function, resulting in a low failure rate. It completely replaces the traditional rolling bearing, and at the same time, it greatly reduces the height of the entire yaw reducer, shrinks the size, reduces the weight of the equipment, thereby reducing the cost and meeting the installation requirements of confined spaces.

[0023] In this embodiment, the top surface of the mounting base 6 is provided with threaded holes 62 evenly distributed in a circular shape near the edge. The mounting base 6 is fixedly connected to the reducer housing by bolts in the threaded holes 62. The outer side of the mounting base 6 is provided with an integral ring rib, and the surface of the ring rib is provided with multiple mounting holes 61 evenly distributed in a circular shape for connecting other equipment.

[0024] In this embodiment, the upper and lower ends of the raceway of the contact surface between the mounting base 6 and the inner ring body 3 are sealed by oil seals 4.

[0025] In this embodiment, the mounting base 6 has an oil hole radially opened in the outer diameter direction of the raceway, and an oil injection nozzle is installed at the outer end of the oil hole to inject lubricating oil and ensure the smooth rotation of the roller.

[0026] In this embodiment, the external gear ring in the reducer unit is shared across stages one, two, and three.

[0027] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, the patent owner may make various modifications or alterations within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present invention, they shall all be within the protection scope of the present invention.

Claims

1. A yaw reducer with a composite rolling bearing housing, comprising a motor, a reducer body, and a composite rolling bearing housing, wherein the motor is connected to the composite rolling bearing housing via the reducer body, characterized in that: The reducer body includes a reducer housing and a reducer unit. The reducer unit is located inside the reducer housing and includes an N-stage planetary gear assembly. The drive shaft of the motor is connected to the N-stage planetary gear mechanism via a sun gear. The N-stage planetary gear assembly has an internal gear ring on its outer surface, which is shared by multiple stages. The bottom surface of the shared gear ring of the reducer housing is connected to the upper plane of the final stage gear ring, and the final stage internal gear ring is connected to the upper plane of the composite rolling bearing body. The N-stage planetary gear assembly includes planetary gears, bearings, planetary shafts, and a final stage planet carrier. The composite rolling bearing body includes an output gear shaft and an inner ring. The gearbox comprises a gear body and a mounting base. One end of the output gear shaft is connected to the final stage star carrier via a connecting key. The output gear shaft is sleeved inside the inner ring body and inserted into the stepped hole of the inner ring body. Its upper end is locked with a nut. The mounting base is annular and located on the outer periphery of the inner ring body. There are three parallel raceways between the inner ring body and the inner ring of the mounting base. Crossed rolling elements are installed in the upper raceway and are located in the raceway between the mounting base and the inner ring body. The lower two raceways are fully filled with rolling elements. The inner ring body and the mounting base are in rolling contact through the rolling elements. The mounting base is fixedly connected to the reducer housing.

2. A yaw reducer with a composite rolling bearing housing according to claim 1, characterized in that: The inner ring body and the upper raceway of the mounting base are composed of two V-shaped raceways, in which rolling elements a are arranged in a cross pattern. The rolling elements a are cylindrical rollers, and adjacent cylindrical rollers are arranged perpendicularly to each other at 90° in the V-shaped raceway. The axis of the rolling element a intersects the axis of the inner ring body at 45°.

3. A yaw reducer with a composite rolling bearing housing according to claim 1, characterized in that: The mounting base has an inner raceway a on its inner circumferential surface. The inner circumference of the intermediate raceway between the inner raceway a and the outer circumference of the inner ring is fully filled with rolling elements b, which are cylindrical rollers. The rolling elements b are installed in the □-shaped groove of the inner raceway a. The inner ring has no upper or lower retaining edges.

4. A yaw reducer with a composite rolling bearing housing according to claim 1, characterized in that: The mounting base has an inner raceway b on the lower circumferential surface of its inner hole, and an outer raceway on the lower circumference of its outer ring. The inner raceway b and the outer raceway are semi-circular, and the axis of the semi-groove is allowed to have an inclination angle of 0-4″ with respect to the inner hole direction of the bottom plane. The lower raceway between the mounting base and the inner ring is fully filled with rolling elements c, which are cylindrical rollers. The rolling elements c are installed in the semi-circular grooves of the mounting base and the inner ring respectively, and are in full contact with the mounting base and the inner ring. The mounting base and the inner ring have retaining edges on the top and bottom.

5. A yaw reducer with a composite rolling bearing body according to claim 1, characterized in that: In the final stage planetary gear mechanism, each planetary gear is equipped with a self-lubricating sliding wear-resistant body. The self-lubricating sliding wear-resistant body is a cylindrical ring made of copper-based alloy material. The outer diameter of the self-lubricating sliding wear-resistant body is interference-fitted with the planetary gear, and the inner diameter is clearance-fitted with the planetary shaft. The self-lubricating sliding wear-resistant body is installed and fixed in the hollow middle of the final stage planetary carrier through the planetary shaft.

6. The yaw reducer with a composite rolling bearing body according to claim 1, characterized in that: The mounting base has threaded holes evenly spaced around its top surface near the edge. The mounting base is fixedly connected to the reducer housing by bolts in the outer threaded holes. The outer side of the mounting base has an integral ring rib with multiple mounting holes evenly spaced around its surface.

7. The yaw reducer with a composite rolling bearing body according to claim 1, characterized in that: The upper and lower ends of the raceway of the contact surface between the mounting base and the inner ring are sealed with oil seals.

8. The yaw reducer with a composite rolling bearing body according to claim 1, characterized in that: The mounting base has an oil hole radially opened in the outer diameter direction of the raceway, and an oil injection nozzle is installed at the outer end of the oil hole.

9. The yaw reducer with a composite rolling bearing body according to claim 1, characterized in that: The external gear ring in the reducer unit is shared by stages one, two, and three.

Images