Variable-pitch lubricating system and wind generating set

Abstract

The invention discloses a variable-pitch lubricating system and a wind generating set, and relates to the technical field of tooth surface lubrication, the variable-pitch lubricating system comprises a variable-pitch bearing and a variable-pitch gear, the variable-pitch bearing comprises a bearing inner ring and a bearing outer ring, and one of the bearing inner ring and the bearing outer ring is set as a variable-pitch gear ring; the variable-pitch gear is meshed with the variable-pitch gear ring, and the variable-pitch gear and the variable-pitch gear ring are respectively provided with meshed tooth surfaces; a lubricating flow channel is formed in at least one of the variable-pitch gear and the variable-pitch gear ring, and a flow channel outlet of the lubricating flow channel is formed in the corresponding meshing tooth face. According to the technical scheme, the lubricating runner is directly formed in the variable-pitch gear and the variable-pitch gear ring, lubricating grease can be directly injected into meshed tooth surfaces, and the lubricating effect between the variable-pitch gear and the variable-pitch bearing is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tooth surface lubrication, and particularly to a pitch lubrication system and a wind turbine generator set. Background Art

[0002] The pitch system is one of the crucial subsystems in modern wind turbine generator sets. Its main function is to optimize the operating performance of the wind turbine by adjusting the angle of the blades, ensuring efficient, stable, and safe conversion of wind energy into electrical energy.

[0003] The main components of the pitch system include a pitch gear and a pitch bearing. The wear degree of the meshing tooth surfaces of the pitch gear and the pitch bearing directly affects the pitch accuracy of the pitch system. Therefore, a lubrication system is also required to provide lubricating grease for the meshing tooth surfaces of the pitch gear and the pitch bearing. However, the lubrication effect of the meshing tooth surfaces of the pitch system of existing wind turbine generator sets is poor, and the meshing tooth surfaces are severely worn. Summary of the Invention

[0004] The main objective of the present invention is to propose a pitch lubrication system and a wind turbine generator set, aiming to solve the problem of poor lubrication effect of the lubrication system between the pitch gear and the pitch bearing in existing wind turbine generator sets.

[0005] To achieve the above objective, the pitch lubrication system proposed by the present invention includes:

[0006] A pitch bearing, including an inner bearing ring and an outer bearing ring, one of the inner bearing ring and the outer bearing ring is set as a pitch gear ring; and,

[0007] A pitch gear, meshed with the pitch gear ring, the pitch gear and the pitch gear ring respectively have meshing tooth surfaces;

[0008] Wherein, at least one of the pitch gear and the pitch gear ring is formed with a lubrication flow channel, and the flow channel outlet of the lubrication flow channel is formed on the corresponding meshing tooth surface.

[0009] In one embodiment, the pitch gear ring has a zero-degree tooth;

[0010] The lubrication flow channel is formed on the pitch gear ring, and the flow channel outlet of the lubrication flow channel is arranged corresponding to the zero-degree tooth.

[0011] In one embodiment, in the circumferential direction of the meshing tooth surface, a plurality of flow channel outlets are arranged, and at least part of the plurality of flow channel outlets are arranged on both sides of the zero-degree tooth and close to the zero-degree tooth.

[0012] In one embodiment, in the width direction of the meshing tooth surface, a plurality of flow channel outlets are arranged.

[0013] In one embodiment, tooth grooves are formed on the meshing tooth surfaces, and the flow channel outlet is formed on the bottom wall of the tooth grooves.

[0014] In one embodiment, a bearing cavity is formed between the inner bearing ring and the outer bearing ring;

[0015] The lubrication flow channel is formed in the pitch-changing gear ring and is communicated with the bearing cavity.

[0016] In one embodiment, the pitch-changing lubrication system further includes a pressure accumulator, and the pressure accumulator is communicated with the lubrication flow channel.

[0017] In one embodiment, the lubrication flow channel further has a flow channel inlet, and the flow channel inlet is formed on the end face of the pitch-changing gear or the pitch-changing gear ring;

[0018] The pressure accumulator is communicated with the flow channel inlet.

[0019] In one embodiment, the lubrication flow channel includes a first straight flow channel and a second straight flow channel. The first straight flow channel and the second straight flow channel intersect and communicate with each other. The first straight flow channel is communicated with the end face, and the second straight flow channel penetrates through the meshing tooth surface.

[0020] To achieve the above object, the wind turbine generator set proposed by the present invention includes the above-mentioned pitch-changing lubrication system.

[0021] The technical solution provided by the present invention forms a lubrication flow channel inside the pitch-changing gear or the pitch-changing gear ring, and sets the flow channel outlet of the lubrication flow channel on the meshing tooth surface of the pitch-changing gear or the pitch-changing gear ring. Lubricating grease can be directly injected between the meshing tooth surfaces of the pitch-changing gear and the pitch-changing gear ring through the lubrication flow channel. Under the extrusion effect during the meshing of the pitch-changing gear or the pitch-changing gear ring, the lubricating grease can be evenly smeared on the meshing tooth surface, which can play a sufficient lubricating role, improve the lubrication effect of the meshing tooth surface, and improve the problem of serious wear of the meshing tooth surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the pitch-changing lubrication system provided by the present invention;

[0024] Figure 2 is Figure 1 a schematic structural view of the cross-section A-A of the pitch bearing in the middle;

[0025] Figure 3 is Figure 2 a magnified structural view of the local part B in the middle;

[0026] Figure 4 is Figure 1 a three-dimensional structural view of the pitch bearing in the middle;

[0027] Figure 5 is Figure 4 a magnified structural view of the local part C in the middle.

[0028] Explanation of the reference numerals in the attached drawings:

[0029] 100, pitch lubrication system;

[0030] 1, pitch bearing; 11, pitch gear ring; 11a, zero-degree tooth; 1a, inner bearing ring; 1b, outer bearing ring; 1c, bearing cavity; 2, pitch gear; 3, pressure accumulator; a, meshing tooth surface; a1, tooth groove; b, lubrication flow channel; b1, first direct flow channel; b11, flow channel inlet; b2, second direct flow channel; b21, flow channel outlet; c, end face; X, circumferential direction; Y, width direction.

[0031] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the attached drawings. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0033] It should be noted that if there are directional indications involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, such descriptions of "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The pitch system is one of the crucial subsystems in modern wind turbines. Its main function is to optimize the operating performance of the wind turbine by adjusting the angle of the blades, ensuring efficient, stable, and safe conversion of wind energy into electrical energy.

[0036] The main components of the pitch system include a pitch gear and a pitch bearing. The wear degree of the meshing tooth surfaces of the pitch gear and the pitch bearing directly affects the pitch accuracy of the pitch system. Therefore, it is also necessary to provide lubricating grease for the meshing tooth surfaces of the pitch gear and the pitch bearing by setting up a lubrication system. Currently, the lubrication system mainly injects lubricating grease into the meshing clearance from the end faces of the pitch gear and the pitch bearing through nozzles. Since the meshing clearance between the pitch gear and the pitch bearing is usually small, and the lubricating grease is usually relatively viscous, it makes it difficult to evenly apply the lubricating grease to the meshing tooth surfaces, resulting in the problem of poor lubrication effect of the current lubrication system between the pitch gear and the pitch bearing, causing serious wear of the meshing tooth surfaces.

[0037] In view of this, the present invention proposes a pitch lubrication system, aiming to solve the problem of poor lubrication effect of the lubrication system between the pitch gear and the pitch bearing in existing wind turbines.

[0038] Wherein, Figure 1 is a schematic structural diagram of an embodiment of the pitch lubrication system provided by the present invention; Figure 2 is Figure 1 a schematic structural diagram of the sectional view A - A of the pitch bearing in Figure 3 is Figure 2 an enlarged schematic structural diagram of the local part B in Figure 4 is Figure 1 a three - dimensional structural diagram of the pitch bearing in Figure 5 is Figure 4 an enlarged schematic structural diagram of the local part C in

[0039] Please refer to Figure 2 、 Figure 3 and Figure 5, the pitch lubrication system 100 proposed by the present invention includes a pitch bearing 1 and a pitch gear 2. The pitch bearing 1 includes an inner bearing ring 1a and an outer bearing ring 1b, and one of the inner bearing ring 1a and the outer bearing ring 1b is set as a pitch gear ring 11; the pitch gear 2 meshes with the pitch gear ring 11, and the pitch gear 2 and the pitch gear ring 11 respectively have meshing tooth surfaces a; at least one of the pitch gear 2 and the pitch gear ring 11 is formed with a lubrication flow channel b, and the flow channel outlet b21 of the lubrication flow channel b is formed on the corresponding meshing tooth surface a.

[0040] The "pitch bearing 1" is usually composed of an inner bearing ring 1a and an outer bearing ring 1b. The inner bearing ring 1a and the outer bearing ring 1b are respectively connected to the blade and the hub of the wind turbine generator, so as to realize that the blade can perform pitch rotation relative to the hub. In this embodiment, the specific installation methods of the inner bearing ring 1a and the outer bearing ring 1b, the blade and the hub are not limited. The inner bearing ring 1a can be installed on the hub or on the blade; one of the inner bearing ring 1a and the outer bearing ring 1b is set as the pitch gear ring 11. Among them, the type of the pitch gear ring 11 can be divided into an internal gear ring and an external gear ring. When the pitch gear ring 11 is an external gear ring, the pitch gear ring 11 can be understood as the outer bearing ring 1b, because the pitch gear 2 can only mesh with the pitch gear ring 11 on the outside of the pitch bearing 1. When the pitch gear ring 11 is an internal gear ring, the pitch gear ring 11 can be understood as the inner bearing ring 1a. Therefore, the pitch gear 2 can only mesh with the pitch gear ring 11 on the inside of the pitch bearing 1. Both the inner bearing ring 1a and the outer bearing ring 1b may be set as the pitch gear ring 11, and this embodiment does not limit this.

[0041] The "pitch gear 2" meshes with the pitch gear ring 11. Generally, it should be understood that the axial directions of the pitch gear 2 and the pitch gear ring 11 are the same. The "pitch gear 2 and the pitch gear ring 11 respectively have meshing tooth surfaces a" should be understood that the pitch gear 2 has a meshing tooth surface a, and the pitch gear ring 11 also has a meshing tooth surface a. In the embodiment of the present invention, the "meshing tooth surface a" refers to the outer surface of the teeth constituting the pitch gear 2 and the pitch gear ring 11. The meshing tooth surface a includes all the exposed surfaces between the addendum circle and the dedendum circle. Therefore, the meshing tooth surface a can generally be understood to include the tooth side wall, the tooth top wall, and the bottom wall of the tooth groove a1.

[0042] The statement that "at least one of the pitch gear 2 and the pitch gear ring 11 is formed with a lubrication flow channel b" means that the lubrication flow channel b can be set only in the pitch gear 2, or only in the pitch gear ring 11, or the lubrication flow channel b can be set in the pitch gear 2 and the pitch gear ring 11 respectively; the statement that "the flow channel outlet b21 of the lubrication flow channel b is formed on the corresponding meshing tooth surface a" includes that the flow channel outlet b21 is formed on the tooth side wall, the tooth top wall or the bottom wall of the tooth groove a1. This embodiment does not limit this.

[0043] The technical solution provided by the present invention forms a lubricating flow path b inside the pitch gear 2 or the pitch ring gear 11, and sets the flow path outlet b21 of the lubricating flow path b on the meshing tooth surface a of the pitch gear 2 or the pitch ring gear 11. The lubricating grease can be directly injected between the meshing tooth surfaces a of the pitch gear 2 and the pitch ring gear 11 through the lubricating flow path b. Under the extrusion effect when the pitch gear 2 or the pitch ring gear 11 meshes, the lubricating grease can be evenly smeared on the meshing tooth surface a, which can play a sufficient lubricating role, improve the lubrication effect of the meshing tooth surface a, and improve the problem of serious wear of the meshing tooth surface a.

[0044] Please refer to Figure 5 , in an embodiment, the pitch ring gear 11 has a zero-degree tooth 11a; the lubricating flow path b is formed in the pitch ring gear 11, and the flow path outlet b21 of the lubricating flow path b is arranged corresponding to the zero-degree tooth 11a.

[0045] The "zero-degree tooth 11a" generally refers to a specific tooth among multiple teeth on the pitch ring gear 11, which is selected as a reference point or reference for angle measurement. This reference point or reference is used to calibrate and control the angle measurement in the system to ensure that the angle of the blade can be accurately controlled. Moreover, the zero-degree tooth 11a is usually also the tooth that contacts the pitch gear 2 with the highest frequency. That is, when the blade of the wind turbine generator is in a long-term stable working state (the pitch angle of the blade is at zero degree), the tooth on the pitch ring gear 11 that meshes with the pitch gear 2. During the operation of the wind turbine generator, the pitch angle of its blade usually reciprocates around zero degree. Therefore, the zero-degree tooth 11a of the pitch ring gear 11 is usually the most severely worn. The "flow path outlet b21 of the lubricating flow path b is arranged corresponding to the zero-degree tooth" can be understood as that the flow path outlet b21 is directly arranged on the tooth side wall or tooth top wall of the zero-degree tooth 11a, or the flow path outlet b21 is arranged on the bottom wall of the tooth groove a1 close to the zero-degree tooth 11a.

[0046] According to the above technical solution, since the size of the pitch ring gear 11 is relatively large, forming the lubricating flow path b in the pitch ring gear 11 has little influence on the overall strength of the pitch ring gear 11, and the lubricating flow path b can obtain a larger flow path diameter, thereby ensuring the sufficient supply of lubricating grease; moreover, since the flow path outlet b21 is arranged corresponding to the zero-degree tooth 11a, when the blade of the wind turbine generator undergoes a small-angle pitch change, the pitch gear 2 can frequently smear the lubricating grease extruded through the flow path outlet b21, thereby fully lubricating the zero-degree tooth and further reducing the wear rate of the zero-degree tooth.

[0047] Please refer to Figure 5 , in an embodiment, in the circumferential direction X of the meshing tooth surface a, a plurality of flow path outlets b21 are arranged, and at least part of the plurality of flow path outlets b21 are arranged on both sides of the zero-degree tooth and close to the zero-degree tooth 11a.

[0048] As described above, when in a long-term stable working state, the pitch blades of the wind turbine perform pitch activities within a small angle range near the zero-degree angle. In this technical solution, multiple flow channel outlets b21 are provided, and at least some of the multiple flow channel outlets b21 are provided on both sides of the zero-degree tooth and are arranged close to the zero-degree tooth. This enables the lubricating flow channel b to not only lubricate the zero-degree tooth but also lubricate multiple frequently used teeth adjacent to the zero-degree tooth.

[0049] Please continue to refer to Figure 5 , in one embodiment, multiple flow channel outlets b21 are provided in the width direction Y of the meshing tooth surface a.

[0050] The "width direction Y of the meshing tooth surface a" generally refers to the axial direction of the pitch gear 2; in a wind turbine, the specifications of the pitch blades are generally large, so the meshing force transmitted between the pitch gear 2 and the pitch ring 11 is generally large. To adapt to this large meshing force, the contact area of the meshing tooth surface a between the pitch gear 2 and the pitch ring 11 is generally large. Therefore, the meshing tooth surface a is generally designed to be wide.

[0051] In the above technical solution, multiple flow channel outlets b21 are provided in the width direction Y of the meshing tooth surface a, so that each flow channel outlet b21 can be responsible for lubricating a certain range of the meshing tooth surface a, ensuring uniform lubrication of each local position of the meshing tooth surface a along its width direction Y.

[0052] Please continue to refer to Figure 5 , in one embodiment, a tooth groove a1 is formed on the meshing tooth surface a, and the flow channel outlet b21 is formed on the bottom wall of the tooth groove a1.

[0053] The "tooth groove a1" refers to the groove formed between two adjacent teeth, and the "bottom wall" is also the concave wall between the tooth roots of two adjacent teeth.

[0054] Compared with the solution of opening the flow channel outlet b21 on the tooth side wall or the tooth top wall, forming the flow channel outlet b21 on the bottom wall of the tooth groove a1 in the above technical solution has less impact on the strength of the tooth. At the same time, during the meshing process of the pitch gear 2 and the pitch ring 11, the meshing gap at the bottom wall is larger, which is conducive to the flow of the lubricating grease extruded from the flow channel outlet b21 in the meshing gap.

[0055] In one embodiment, a bearing cavity 1c is formed between the bearing inner ring 1a and the bearing outer ring 1b; the lubricating flow channel b is formed on the pitch ring 11 and is arranged to communicate with the bearing cavity 1c.

[0056] It should be noted that the cavity formed between the bearing inner ring 1a and the bearing outer ring 1b of the pitch bearing 1 is usually called the bearing cavity 1c. Please refer to Figure 3, the bearing cavity 1c is mainly used to accommodate rolling elements (such as ball bearings, roller bearings, etc.) and lubricating grease. The lubricating grease is filled in the bearing cavity 1c to reduce the friction between the rolling elements and the inner ring 1a and outer ring 1b of the bearing, and to prevent direct contact between the metal surfaces, thereby extending the service life of the pitch bearing 1.

[0057] In the above technical solution, the lubricating flow channel b is formed in the pitch ring gear 11 and is communicated with the bearing cavity 1c. The lubricating grease stored in the bearing cavity 1c of the pitch bearing 1 can overflow to the meshing tooth surface a through the lubricating flow channel b, which can play a role in strengthening lubrication. Moreover, this setting method does not require an additional lubricating grease supply device, which simplifies the structural complexity of the pitch lubrication system 100.

[0058] Please refer to Figure 1 , in an embodiment, the pitch lubrication system 100 further includes a pressure accumulator 3, and the pressure accumulator 3 is communicated with the lubricating flow channel b.

[0059] The main function of the "pressure accumulator 3" is to provide pressure for the lubricating flow channel b, so as to pressurize and spray the lubricating grease in the lubricating flow channel b to the meshing tooth surface a. There are many specific types of the pressure accumulator 3, such as a bladder accumulator, a piston accumulator, and a diaphragm accumulator. The specific structure of the pressure accumulator 3 is not limited in the embodiments of the present invention.

[0060] In the above technical solution, with the help of the pressure accumulator 3, the lubricating grease can be pressurized and sprayed from the flow channel outlet b21 to the meshing tooth surface a, which is beneficial to ensuring the oil output of the lubricating grease, so that the meshing tooth surface a can be fully coated with the lubricating grease, further improving the lubrication effect.

[0061] Please refer to Figure 3 , in an embodiment, the lubricating flow channel b further has a flow channel inlet b11, and the flow channel inlet b11 is formed on the end face c of the pitch gear 2 or the pitch ring gear 11; the pressure accumulator 3 is communicated with the flow channel inlet b11.

[0062] The "end face c of the pitch gear 2 or the pitch ring gear 11" usually refers to one of its axial directions. In the above technical solution, forming the flow channel inlet b11 on the end face c of the pitch gear 2 or the pitch ring gear 11 is beneficial to the connected installation of the pressure accumulator 3. Usually, the pitch lubrication system 100 also has a lubricating oil pump, and the lubricating oil pump is used to pump lubricating grease into the flow channel inlet b11.

[0063] Please continue to refer to Figure 3 , in an embodiment, the lubricating flow channel b includes a first straight flow channel b1 and a second straight flow channel b2. The first straight flow channel b1 and the second straight flow channel b2 intersect and communicate with each other. The first straight flow channel b1 is communicated with the end face c, and the second straight flow channel b2 penetrates through the meshing tooth surface a.

[0064] The "direct flow channel" should be understood as a flow channel extending in a straight line. The first direct flow channel b1 and the second direct flow channel b2 are arranged to intersect each other. The intersection angle between the two can theoretically be any value between 0° and 180°. However, usually, this intersection angle is 90°, that is, the first direct flow channel b1 and the second direct flow channel b2 are arranged perpendicular to each other. The "end face c" can be the end face of the pitch-changing gear 2 or the pitch-changing gear ring 11 along the width direction Y of the meshing tooth surface a, or it can be the end face without machined meshing teeth that is arranged side by side with the meshing tooth surface a along the above-mentioned width direction as shown in Figure 3 . "The first direct flow channel b1 communicates with the end face c" can be understood as that the first direct flow channel b1 penetrates the end face c in its extending direction (at this time, the end face c needs to be located along the width direction Y of the meshing tooth surface a of the pitch-changing gear 2 or the pitch-changing gear ring 11), or it can be understood that the first direct flow channel b1 indirectly communicates with the end face c through a flow channel extending in other directions, as shown in Figure 3 .

[0065] There are various ways to machine the lubrication flow channel b inside the pitch-changing gear 2 or the pitch-changing gear ring 11. For example, it can be achieved by casting. However, in a wind turbine generator set, the specifications of the pitch-changing gear 2 or the pitch-changing gear ring 11 are generally large, and the casting method will undoubtedly increase the complexity of the process. In the above technical solution, the lubrication flow channel b is formed by the intersection and connection of the first direct flow channel b1 and the second direct flow channel b2. Based on this, the first direct flow channel b1 and the second direct flow channel b2 can be machined on the end face c and the meshing tooth surface a successively by milling, and just milling through is enough. The complexity of the milling process allowed by the structure of this lubrication flow channel b is relatively low.

[0066] It should be noted that in the Figure 3 shown embodiment, since the first direct flow channel b1 indirectly communicates with the end face c through a flow channel extending in other directions, after machining the first direct flow channel b1 from the end face along the width direction Y of the meshing tooth surface a by milling, its end needs to be closed.

[0067] The present invention also proposes a wind turbine generator set, which includes the above-mentioned pitch-changing lubrication system 100. The specific structure of the pitch-changing lubrication system 100 refers to the above embodiment. Since this wind turbine generator set adopts all the technical solutions of the above all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here. In addition, a wind turbine generator set usually also has blades and a hub. The bearing outer ring 1b of the pitch-changing bearing 1 is usually installed on the hub, and the blades are axially installed on the bearing inner ring 1a of the pitch-changing bearing 1. The pitch-changing gear 2 meshes with the bearing inner ring 1a, so as to drive the bearing inner ring 1a to rotate, so as to achieve the purpose of adjusting and changing the blade angle.

[0068] In a specific embodiment, the pitch lubrication system 100 provided by the present invention includes a pitch bearing 1, a pitch gear 2, and a pressure accumulator 3. The pitch bearing 1 includes an inner bearing ring 1a and an outer bearing ring 1b. The inner bearing ring 1a is provided as a pitch gear ring 11. The pitch gear ring 11 has zero-degree teeth. The pitch gear 2 meshes with the pitch gear ring 11. The pitch gear 2 and the pitch gear ring 11 respectively have meshing tooth surfaces a. Wherein, a lubrication flow channel b is formed on the pitch gear ring 11. The lubrication flow channel b has a plurality of flow channel outlets b21. The plurality of flow channel outlets b21 are formed on the meshing tooth surface a of the pitch gear ring 11 corresponding to the zero-degree teeth. Tooth grooves a1 are formed on the meshing tooth surface a. In the circumferential direction X of the meshing tooth surface a, the plurality of flow channel outlets b21 are respectively arranged at the bottom walls of the plurality of tooth grooves a1 corresponding to the zero-degree teeth, and at least part of them are arranged on both sides of the zero-degree teeth. The flow channel inlet b11 of the lubrication flow channel b is formed on the end face c of the pitch gear ring 11. The pressure accumulator 3 is communicated with the flow channel inlet b11. The lubrication flow channel b includes a first straight flow channel b1 and a second straight flow channel b2. The first straight flow channel b1 and the second straight flow channel b2 intersect and communicate with each other. The first straight flow channel b1 penetrates through the end face c. The second straight flow channel b2 penetrates through the meshing tooth surface a. The flow channel inlet b11 is located in the first straight flow channel b1, and the flow channel outlet b21 is located in the second straight flow channel b2.

[0069] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the concept of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A pitch lubrication system, characterized in that, Comprising: A pitch bearing, including an inner bearing ring and an outer bearing ring, one of the inner bearing ring and the outer bearing ring is provided as a pitch gear ring; and, A pitch gear, meshed with the pitch gear ring, the pitch gear and the pitch gear ring respectively have meshing tooth surfaces; Wherein, at least one of the pitch gear and the pitch gear ring is formed with a lubrication flow channel, and the flow outlet of the lubrication flow channel is formed on the corresponding meshing tooth surface.

2. The pitch lubrication system according to claim 1, characterized in that, The pitch gear ring has zero-degree teeth; The lubrication flow channel is formed on the pitch gear ring, and the flow outlet of the lubrication flow channel is arranged corresponding to the zero-degree teeth.

3. The pitch lubrication system according to claim 2, characterized in that, In the circumferential direction of the meshing tooth surface, a plurality of flow outlets are arranged, and at least part of the plurality of flow outlets are arranged on both sides of the zero-degree teeth and are arranged close to the zero-degree teeth.

4. The pitch lubrication system according to claim 1, characterized in that, In the width direction of the meshing tooth surface, a plurality of flow outlets are arranged.

5. The pitch lubrication system according to claim 1, characterized in that, Tooth grooves are formed on the meshing tooth surface, and the flow outlets are formed on the bottom wall of the tooth grooves.

6. The pitch lubrication system according to any one of claims 1 to 5, characterized in that A bearing cavity is formed between the inner bearing ring and the outer bearing ring; The lubrication flow channel is formed on the pitch gear ring and is communicated with the bearing cavity.

7. The pitch lubrication system according to any one of claims 1 to 5, characterized in that, The pitch lubrication system further includes a pressure accumulator, and the pressure accumulator is communicated with the lubrication flow channel.

8. The pitch lubrication system according to claim 7, wherein, The lubrication flow channel further has a flow inlet, and the flow inlet is formed on the end surface of the pitch gear or the pitch gear ring; The pressure accumulator is communicated with the flow inlet.

9. The pitch lubrication system according to claim 8, characterized in that, The lubrication flow channel includes a first straight flow channel and a second straight flow channel, the first straight flow channel and the second straight flow channel intersect and communicate with each other, the first straight flow channel is communicated with the end surface, and the second straight flow channel penetrates through the meshing tooth surface.

10. A wind turbine generator, characterized in that, Comprising the pitch lubrication system according to any one of claims 1 to 9.

Images