Variable-clearance wind turbine overdrive planetary wheel bearing

Abstract

This invention provides a variable clearance planetary gear bearing for wind turbine speed increasers, comprising planetary pins, planetary carriers, an inner ring, an outer ring, and a plurality of rollers. Two planetary carriers are respectively fitted onto the two ends of the planetary pins. The inner and outer rings are fitted between the two planetary carriers, forming raceways for accommodating the rollers. The raceways are arranged in four rows, with the raceways closest to the two planetary carriers inclined. A first clearance is formed between the raceways closest to the two planetary carriers and the rollers therein, while a second clearance is formed between the two middle raceways and the rollers therein. The first clearance is larger than the second clearance. Addressing the shortcomings of existing technologies, this invention provides a variable clearance planetary gear bearing for wind turbine speed increasers, which allows for more uniform stress distribution among the multiple rows of rollers and results in a more consistent service life.

Description

Technical Field

[0001] This invention relates to the field of bearings, and in particular to a planetary gear bearing for a variable clearance wind turbine speed increaser. Background Technology

[0002] In the current wind power generation field, with the continuous increase in the power of wind power equipment, the performance requirements for core transmission components are becoming increasingly stringent. Among them, the wind turbine gearbox, as a key device in wind turbine generator sets that converts the low speed of the wind turbine rotor to the high speed of the generator, directly determines the reliability and economy of the entire wind turbine generator set through its operational stability and service life. The wind turbine gearbox has a complex structure and is prone to significant deformation during actual operation. This is mainly because the load transmitted from the wind turbine blade end to the main shaft directly acts on the first-stage planetary carrier, which in turn causes significant deformation of the planetary carrier. At the same time, the first-stage planetary carrier itself has the structural characteristics of large volume and wide gears. This results in significant differences in the force distribution of the rollers in different positions within the two sets of double-row cylindrical roller bearings installed on a single planetary gear, leading to a large difference in the service life of the rollers within the bearings.

[0003] As the core supporting component of the planetary gear system of wind power gearbox, the performance of existing planetary gear bearings directly affects the operating accuracy of the planetary gears and the overall transmission efficiency. Traditional planetary gear bearings usually adopt a fixed clearance design, which cannot adapt to the uneven force caused by the deformation of the planetary carrier, and it is difficult to effectively solve the problems of uneven roller force and large life difference. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a variable clearance planetary gear bearing for wind turbine speed increasers, which enables more uniform force distribution among multiple rows of rollers and results in a closer service life.

[0005] To achieve the above objectives, the present invention provides a variable clearance wind turbine gearbox planetary bearing, comprising a planetary pin, a planetary carrier, an inner ring, an outer ring, and a plurality of rollers. Two planetary carriers are respectively fitted onto the two ends of the planetary pin. The inner and outer rings are fitted between the two planetary carriers and form raceways for accommodating the plurality of rollers. The raceways are arranged in four rows, with the raceways closest to the two planetary carriers being inclined. A first clearance is formed between the raceways closest to the two planetary carriers and the rollers therein, and a second clearance is formed between the two middle raceways and the rollers therein. The first clearance is larger than the second clearance.

[0006] The advantages of the above technical solution are as follows: Four rows of raceways are formed between the inner and outer rings, and the two rows of raceways located on both sides of the axial direction near the planetary carrier are inclined, so that the raceways have a small angle. The first clearance between the raceway near the planetary carrier and the roller is larger than the second clearance between the middle raceway and the roller. Since the planetary carrier tends to deform under stress, the deformation is greater closer to the gear end face. That is, the clearance of the bearing row near the gear center is relatively small. When the planetary carrier bearing bears a large load and the planetary carrier also deforms, the bearing row near the gear center has a smaller clearance and bears the load first, while the bearings on both sides near the gear end face have a larger clearance. The bearings bear the load after the external system deforms. This effectively solves the problem that traditional fixed clearance bearings cannot adapt to deformation and cause uneven bearing force. It balances the force on each raceway, reduces the force difference, ensures operating accuracy and transmission efficiency, extends bearing service life, and is suitable for the harsh working conditions of high-power wind turbine gearboxes.

[0007] The present invention can be further configured such that: a bushing is provided on the planetary pin, the inner ring is fitted on the bushing, the bushing is connected to the planetary pin near one side, and there is a clearance fit between the two sides of the bushing and the planetary pin.

[0008] By further configuring the bushing on the planetary pin, the inner ring of the bearing is fitted onto the bushing. The bushing is connected to the planetary pin on one side and has a clearance fit on both sides. This allows the bushing to self-adaptively float and slightly wobble when the planetary carrier is deformed under load. This compensates for coaxiality errors during installation and operation, avoids stress concentration caused by rigid connections, and makes the force between the inner ring of the bearing and the rollers and raceways more uniform. This effectively reduces local overload and wear, and improves the operational stability and service life of the planetary gear bearing.

[0009] The present invention can be further configured such that the inclination of the raceways near the two planetary carriers is 0.03°-0.05°.

[0010] By further adjusting the settings, the inclination of the raceways closest to the two planetary carriers is controlled within the range of 0.03°-0.05°. This allows for better matching of the deformation trend of the planetary carriers under load, while ensuring the overall structural strength and assembly accuracy of the bearing. It also rationally distributes the force across the four raceways, preventing stress concentration on the edge raceways due to uneven loading. Furthermore, it prevents bearing instability, roller slippage, or abnormal wear caused by excessive inclination angles, resulting in more uniform bearing stress. The present invention can be further configured such that the first clearance is 15μm-20μm larger than the second clearance.

[0011] By further designing the first clearance to be 15μm-20μm larger than the second clearance, the present invention allows the two raceways to reserve compensation space to accommodate the deformation when the planetary carrier is deformed under load, thus avoiding premature jamming, uneven loading, and stress concentration at the edge. At the same time, the middle raceway maintains a smaller clearance to ensure support stiffness and operational accuracy. This achieves both adaptive compensation for planetary carrier deformation and balanced load distribution across the four rows of rollers.

[0012] The present invention can be further configured such that: a threaded portion for screwing and engaging with the planetary pin is provided on one side of the bushing.

[0013] With further design, the bushing is screwed to the planetary pin through a single-sided threaded part. This not only achieves reliable positioning and fastening of the bushing on the planetary pin, preventing axial movement of the bushing during high-speed operation and ensuring the overall installation stability of the bearing, but also preserves clearance fit space between the bushing and the planetary pin on both sides, taking into account both connection reliability and self-adaptive deformation capability.

[0014] The present invention can be further configured such that: the bushing has an arc portion on both sides of the threaded portion, and the planetary pin has a concave portion corresponding to the arc portion.

[0015] By further designing the bushing, arc-shaped portions are provided on both sides of the threaded portion, which mate with the corresponding concave portions on the planetary pin. This allows the bushing and the planetary pin to form a close-fitting arc-shaped mating surface. While ensuring accurate radial positioning of the bushing, this provides reasonable space for micro-oscillation and deformation compensation, further enhancing the bushing's adaptability to planetary carrier deformation and installation deviations. It also avoids stress concentration and rigid interference, making the bearing inner ring more evenly stressed and improving the operational stability and service life of the planetary gear bearing under complex working conditions.

[0016] The present invention can be further configured such that a washer is provided between one side of the bushing and the corresponding planetary carrier.

[0017] By further configuring the bushing, a washer is installed between one side of the bushing and the corresponding planetary carrier. The washer can form a reliable axial limit and buffer support for the bushing, avoiding direct rigid contact between the bushing and the planetary carrier, reducing axial impact and frictional wear during operation. At the same time, the limiting purpose can be adjusted by adjusting the washer. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is an embodiment of the present invention. Figure 1 An enlarged view of part a; Among them: planetary pin 1; recess 11; planetary carrier 2; inner ring 3; outer ring 4; roller 5; bushing 6; threaded part 61; arc part 62; washer 7. Detailed Implementation

[0019] An embodiment of the planetary gear bearing for a variable clearance wind turbine speed increaser of the present invention is as follows: Figure 1-2 As shown: It includes a planetary pin 1, a planetary carrier 2, an inner ring 3, an outer ring 4, and several rollers 5. There are two planetary carriers 2, which are respectively fitted at both ends of the planetary pin 1. The inner ring 3 and the outer ring 4 are fitted between the two planetary carriers 2 and form raceways for accommodating the several rollers 5. The raceways are arranged in four rows, and the inclination of the raceways closest to the two planetary carriers 2 is 0.03°-0.05°. A first clearance is formed between the raceways closest to the two planetary carriers 2 and the rollers 5 therein, and a second clearance is formed between the two middle raceways and the rollers 5 therein. The first clearance is 15μm-20μm larger than the second clearance.

[0020] A bushing 6 is provided on the planetary pin 1, and the inner ring 3 is fitted on the bushing. The bushing 6 is connected to the planetary pin near one side, and there is a clearance fit between the two sides of the bushing 6 and the planetary pin 1.

[0021] The bushing 6 is provided with a threaded part 61 near one side for screwing and engaging with the planetary pin 1.

[0022] The bushing 6 has an arc portion 62 on both sides of the threaded portion 61, and the planetary pin 1 has a recess 11 with a corresponding arc size at the arc portion 62.

[0023] A washer 7 is provided between one side of the bushing 6 and the corresponding planetary carrier 2.

[0024] The above examples are merely one preferred embodiment of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included within the protection scope of the present invention.

Claims

1. A planetary gear bearing for a variable clearance wind turbine gearbox, comprising planetary pins, planetary carriers, an inner ring, an outer ring, and a plurality of rollers, wherein there are two planetary carriers respectively fitted at both ends of the planetary pins, and the inner and outer rings are fitted between the two planetary carriers and form raceways for accommodating the plurality of rollers, characterized in that: The raceways are arranged in four rows, with the raceways closest to the two planetary carriers being inclined. A first clearance is formed between the raceways closest to the two planetary carriers and the rollers therein, and a second clearance is formed between the middle two raceways and the rollers therein. The first clearance is larger than the second clearance.

2. The planetary gear bearing for a variable clearance wind turbine speed increaser according to claim 1, characterized in that: A bushing is provided on the planetary pin, and the inner ring is fitted on the bushing. The bushing is connected to the planetary pin near one side, and there is a clearance fit between the two sides of the bushing and the planetary pin.

3. The planetary gear bearing for a variable clearance wind turbine speed increaser according to claim 1, characterized in that: The inclination of the raceways near the two planetary carriers is 0.03°-0.05°.

4. The planetary gear bearing for a variable clearance wind turbine speed increaser according to claim 1, characterized in that: The first clearance is 15μm-20μm larger than the second clearance.

5. The planetary gear bearing for a variable clearance wind turbine speed increaser according to claim 2, characterized in that: The bushing has a threaded part near one side for screwing into the planetary pin.

6. The planetary gear bearing for a variable clearance wind turbine speed increaser according to claim 5, characterized in that: The bushing has an arc portion on both sides of the threaded portion, and the planetary pin has a corresponding concave portion at the arc portion.

7. The planetary gear bearing for a variable clearance wind turbine speed increaser according to claim 5 or 6, characterized in that: A washer is provided between one side of the bushing and the corresponding planetary carrier.

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