Wear-resistant wind power gear box

Abstract

The invention provides a wear-resistant wind power gear box, and relates to the technical field of wind power, the wear-resistant wind power gear box comprises a gear box shell fixedly connected to the top of a fixing frame, the inner side wall of the gear box shell is rotatably connected with a medium-speed transmission shaft, the inner side wall of the gear box shell is fixedly connected with a supporting cylinder, and the inner side wall of the supporting cylinder is fixedly connected with a fixing seat; the outer side wall of the fixing seat is rotationally connected with a connecting rod, the inner side wall of the connecting rod is rotationally connected with the outer side wall of the gearbox shell, a notch is formed in the outer side wall of the fixing seat, and the outer side wall of the fixing seat is fixedly connected with a reset spring; through cooperative use of the supporting cylinder, the fixing base, the connecting rod, the notch and the reset spring, the gear box shell which generates elastic deformation due to the influence of loads can be conveniently supported in the use process, deformation of tooth profiles and tooth curves of gears caused by deformation of the gear box shell is avoided, unbalance loading of the gears in the meshing process is avoided, and the service life of the gears is prolonged. And therefore, tooth surface micro pitting corrosion caused by overlarge local stress of the tooth surface is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of wind power, and in particular to a wear-resistant wind power gearbox. Background Art

[0002] As a clean and renewable energy source, wind power occupies an increasingly important position in the global energy structure. Wind power gearbox is one of the key components in wind turbines. Its main function is to convert the low speed of the wind wheel into the high speed required by the generator, thereby achieving efficient power output; Wind turbine gearboxes are usually composed of multiple gears, including high-speed shaft gears, intermediate shaft gears, and low-speed shaft gears. These gears need to withstand huge loads in the process of transmitting power, including the torque of the wind rotor, gravity, and various dynamic loads.

[0003] However, when the gearbox transmits power, due to the load, each component will produce different degrees of elastic deformation. This deformation will cause the gear tooth profile and tooth curve to deform, causing the gear to produce an offset load during the meshing process. Specifically, when the gear tooth profile and tooth curve change, the contact between the gears is no longer uniform, and some tooth surfaces bear too much load, resulting in local stress concentration. In this offset state for a long time, the local stress on the tooth surface is too large, which may cause micro pitting on the tooth surface. Micro pitting on the tooth surface will further reduce the transmission accuracy and efficiency of the gear, increase the wear and noise of the gear, and seriously affect the reliability and service life of the wind power gearbox. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art and to propose a wear-resistant wind turbine gearbox to solve the problem that the components in the above technical solution will produce different degrees of elastic deformation, resulting in uneven contact between gears, excessive load on some tooth surfaces, and local stress concentration.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a wear-resistant wind power gearbox comprises a fixing frame, a supporting structure is arranged above the fixing frame, and a lubrication structure is arranged inside the supporting structure; The supporting structure includes a gearbox housing fixedly connected to the top of the fixing frame, the inner side wall of the gearbox housing is rotatably connected to the power input shaft, the inner side wall of the gearbox housing is fixedly connected to a support tube, a medium-speed transmission shaft is arranged inside the support tube, the inner side wall of the support tube is fixedly connected to a fixing seat, the outer side wall of the fixing seat is rotatably connected to a connecting rod, the inner side wall of the connecting rod is rotatably connected to the outer side wall of the medium-speed transmission shaft, a notch is provided on the outer side wall of the fixing seat, a return spring is fixedly connected to the outer side wall of the fixing seat, an end of the return spring away from the fixing seat is fixedly connected to the outer side wall of the connecting rod, and a power output shaft is arranged on an end of the gearbox housing away from the power output shaft.

[0006] As a preferred embodiment, the lubrication structure includes an eccentric wheel fixedly connected to the outer wall of the power input shaft, the outer wall of the gear box housing is penetrated with a fixing hole, the top of the fixing frame is fixedly connected with a storage tank, the end of the storage tank away from the fixing frame is located inside the gear box housing, the top of the storage tank is slidably connected with a piston, the inner top of the storage tank is fixedly connected with a conical spring, the end of the conical spring away from the storage tank is fixedly connected to the outer wall of the piston, the inner wall of the piston is provided with a feed hole, and the outer wall of the piston is penetrated with a discharge hole.

[0007] The beneficial effect of adopting the above further scheme is that by arranging the medium-speed transmission shaft, the eccentric wheel, the storage tank, the piston, the conical spring, the feed hole and the discharge hole, the lubricating oil can be intermittently supplied following the rotation of the medium-speed transmission shaft.

[0008] As a preferred embodiment, a primary planetary gear set is disposed on the inner side wall of the gear box housing, and a secondary planetary gear set is disposed on the inner side wall of the support cylinder.

[0009] The beneficial effect of adopting the above further solution is: by setting up a first-stage planetary gear set and a second-stage planetary gear set, it is convenient to convert the low speed of the wind fan blades and increase the speed.

[0010] As a preferred implementation, the eccentric wheel is located directly above the return spring, and the center axis of the eccentric wheel coincides with the center axis of the piston.

[0011] The beneficial effect of adopting the above further solution is: by arranging the eccentric wheel to be located directly above the piston, and the central axis of the eccentric wheel coincides with the central axis of the piston, the eccentric wheel is prevented from being separated from the piston during rotation, thereby improving the stability of the lubricating oil supply.

[0012] As a preferred embodiment, a fast transmission shaft is provided at one end of the gear box housing, and the fast transmission shaft is transmission-connected to the power output shaft via gears.

[0013] The beneficial effect of adopting the above further solution is that by providing a fast transmission shaft, the kinetic energy generated by the rotation of the wind fan blades can be easily transmitted.

[0014] As a preferred embodiment, a delivery pump is fixedly connected to the top of the fixed frame, a storage box is fixedly connected to the top of the fixed frame, an output end of the delivery pump is fixedly connected to a feed pipe, and an end of the feed pipe away from the delivery pump is fixedly connected to a storage tank.

[0015] The beneficial effect of adopting the above further solution is that by providing a delivery pump and a storage box, it is convenient to replenish the lubricating oil inside the storage tank.

[0016] As a preferred embodiment, the outer side wall of the storage tank is fixedly connected with a discharge pipe, and one end of the discharge pipe away from the storage tank is located inside the gear box housing.

[0017] The beneficial effect of adopting the above further solution is that by providing a discharge pipe, the lubricating oil can be easily transmitted, thereby facilitating the lubrication and protection of the transmission parts inside the gear box housing.

[0018] As a preferred embodiment, a pipeline groove is provided on the inner side wall of the fixing frame, and the inner side wall of the pipeline groove fits with the outer side wall of the discharge pipe.

[0019] The beneficial effect of adopting the above further solution is: by providing a pipeline groove, it is convenient to fix and support the discharge pipe, thereby preventing the discharge pipe from shifting during use.

[0020] Compared with the prior art, the advantages and positive effects of the present invention are: By using the supporting tube, the fixing seat, the connecting rod, the notch and the return spring in coordination, it is convenient to support the gear box housing which is elastically deformed by the load during use, so as to avoid deformation of the gear box housing causing deformation of the tooth profile and tooth curve of the gear, thereby avoiding unbalanced load during the meshing process of the gear, and further avoiding excessive local stress on the tooth surface, which may cause micro pitting on the tooth surface.

[0021] Through the coordinated use of the medium-speed transmission shaft, eccentric wheel, storage tank, piston, conical spring, feed hole and discharge hole, it is convenient to intermittently supply the lubricating oil inside the storage tank, thereby avoiding a large amount of lubricating oil accumulation in the transmission structure, thereby avoiding excessively high oil temperature of the lubricating oil in the gear meshing area, reducing the lubrication effect, and thus avoiding micro pitting on the outer wall of the gear.

[0022] The coordinated use of the pipeline groove and the discharge pipe facilitates the positioning of the discharge pipe, thereby preventing the discharge pipe from being offset due to equipment shaking during use, thereby preventing the lubricating oil from failing to reach the designated location, and further preventing the friction loss between the gears from increasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the wear-resistant wind power gearbox of the present invention; Figure 2 This is a schematic diagram of the structure of the gearbox housing and related parts of the wear-resistant wind power gearbox of the present invention; Figure 3 This is a schematic diagram of the structure of the wear-resistant wind turbine gearbox fixing seat and related parts of the present invention; Figure 4 This is a schematic diagram of the structure of the wear-resistant wind power gearbox connecting rod and related parts of the present invention; Figure 5This is a schematic diagram of the structure of the wear-resistant wind power gearbox storage tank and related parts of the present invention; Figure 6 The wear-resistant wind power gearbox of the present invention Figure 5 The enlarged schematic diagram of the parts structure at A in the middle; Figure 7 This is a schematic diagram of the structure of the wear-resistant wind power gearbox piston and related parts of the present invention; Figure 8 This is a schematic diagram of the cross section of the wear-resistant wind power gearbox piston and the structure of related parts of the present invention.

[0024] Legend: 1. Fixed frame; 2. Support structure; 201. Gearbox housing; 202. Medium-speed transmission shaft; 203. Support cylinder; 204. Fixed seat; 205. Connecting rod; 206. Notch; 207. Return spring; 208. Primary planetary gear set; 209. Secondary planetary gear set; 210. Fast transmission shaft; 2021. Power input shaft; 2022. Power output shaft; 3. Lubrication structure; 301. Eccentric wheel; 302. Fixing hole; 303. Storage tank; 304. Pipeline groove; 305. Feed pipe; 306. Discharge pipe; 307. Piston; 308. Conical spring; 309. Feed hole; 310. Discharge hole; 311. Delivery pump; 312. Storage box. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the present invention provides a technical solution: a wear-resistant wind power gearbox, comprising a fixing frame 1, a supporting structure 2 is arranged above the fixing frame 1, and a lubrication structure 3 is arranged inside the supporting structure 2; The support structure 2 includes a gearbox housing 201 fixedly connected to the top of the fixed frame 1, the inner side wall of the gearbox housing 201 is rotatably connected to a power input shaft 2021, the central axis of the power input shaft 2021 coincides with the central axis of the gearbox housing 201, the inner side wall of the gearbox housing 201 is fixedly connected to a support cylinder 203, a medium-speed transmission shaft 202 is arranged inside the support cylinder 203, a fixed seat 204 is fixedly connected to the inner side wall of the support cylinder 203, three fixed seats 204 are arranged, and the three fixed seats 204 are spirally distributed along the medium-speed transmission shaft 202, the outer side walls of the three fixed seats 204 are rotatably connected to connecting rods 205, and the inner side walls of the three connecting rods 205 are respectively connected to the medium-speed transmission shaft 202. The outer wall of the moving shaft 202 is rotatably connected, and the outer walls of the three fixed seats 204 are all provided with notches 206. The outer walls of the three fixed seats 204 are respectively fixedly connected with return springs 207. The ends of the three return springs 207 away from the three fixed seats 204 are respectively fixedly connected with the outer walls of the three connecting rods 205. The outer diameter of the return spring 207 is between 100-200mm, the wire diameter is between 15-20mm, the number of turns is 15, and 60Si2Mn alloy spring steel is used. It has high strength, good elasticity and toughness, and can meet the use requirements in the wind power generation environment. The end of the gearbox housing 201 away from the power output shaft 2021 is provided with a power output shaft 2022; During use, as the fan blades rotate, the medium-speed transmission shaft 202 connected to the fan blades rotates with the fan blades. Since the fan blades generate huge torque when rotating, the medium-speed transmission shaft 202 may be bent or shifted when subjected to force. When the medium-speed transmission shaft 202 bends, it will cause the position of the connecting rod 205 to shift. At this time, the connecting rod 205 compresses or pulls the return spring 207. At this time, the elastic force of the return spring 207 itself applies a pulling force or a pushing force to the connecting rod 205, thereby supporting the connecting rod 205, and then supporting the medium-speed transmission shaft 202 through the connecting rod 205, avoiding the medium-speed transmission shaft 202 from shifting after being subjected to force, reducing the probability of deformation of the gear tooth profile and tooth direction curve, thereby avoiding overloading of the gear during meshing, and thereby avoiding excessive local stress on the tooth surface, causing micro-pitting on the tooth surface.

[0027] like Figure 7 and Figure 8As shown: the lubrication structure 3 includes an eccentric wheel 301 fixedly connected to the outer wall of the power input shaft 2021, a fixing hole 302 is formed through the outer wall of the gear box housing 201, and the fixing hole 302 is located below the eccentric wheel 301. A storage tank 303 is fixedly connected to the top of the fixing frame 1, and the end of the storage tank 303 away from the fixing frame 1 is located inside the gear box housing 201. A piston 307 is slidably connected to the top of the storage tank 303, and the bottom outer wall of the piston 307 is in contact with the inner wall of the storage tank 303, and the bottom cross section of the piston 307 is concave, which is convenient for lubrication. The lubricating oil is carried, and a conical spring 308 is fixedly connected to the inner top of the storage tank 303. The conical spring 308 is conical, which is convenient for reducing the space occupied by the conical spring 308, thereby increasing the storage capacity of the lubricating oil inside the storage tank 303. The end of the conical spring 308 away from the storage tank 303 is fixedly connected to the outer wall of the piston 307, and a feed hole 309 is opened on the inner wall of the piston 307. The bottom of the piston 307 is through-shaped, and a discharge hole 310 is opened through the outer wall of the piston 307. The feed hole 309 is connected with the internal space of the storage tank 303 through the discharge hole 310. When in use, the rotation of the power input shaft 2021 drives the eccentric wheel 301 to rotate synchronously. When the end of the eccentric wheel 301 away from the power input shaft 2021 conflicts with the top of the piston 307, the piston 307 is forced to move toward the bottom of the storage tank 303. At this time, the lubricating oil below the piston 307 is squeezed by the piston 307 and enters the inside of the feed hole 309. As the piston 307 moves, the lubricating oil inside the feed hole 309 gradually accumulates, and finally enters the inside of the storage tank 303 along the discharge hole 310. The eccentric wheel 301 is located above the bottom moving block of the piston 307. As the eccentric wheel 301 rotates, the eccentric wheel 301 and the piston 307 gradually move away from each other. At this time, under the action of the conical spring 308, the piston 307 gradually moves toward the top of the storage tank 303. As the piston 307 is lifted, the lubricating oil above the piston 307 is discharged to the outside of the storage tank 303 along the discharge port. As the medium-speed transmission shaft 202 rotates, the eccentric wheel 301 intermittently resists the piston 307, thereby realizing the intermittent supply of lubricating oil.

[0028] like Figure 2 and Figure 5As shown in the figure: the inner wall of the gearbox housing 201 is provided with a primary planetary gear set 208, and the inner wall of the support cylinder 203 is provided with a secondary planetary gear set 209. The inner diameters of the support cylinder 203 and the gearbox housing 201 are not equal, so the diameters of the two planetary gear sets are different. Since the intermediate speed transmission shaft 202 between the primary planetary gear set 208 and the secondary planetary gear set 209 is affected by the forces of the primary planetary gear set 208 and the secondary planetary gear set 209 in two directions, the intermediate speed transmission shaft 202 is located between the primary planetary gear set 208 and the secondary planetary gear set 209. 8. The portion between the secondary planetary gear set 209 is subjected to a relatively large torque. The three fixed seats 204, three connecting rods 205, three notches 206 and three return springs 207 are all arranged between the primary planetary gear set 208 and the secondary planetary gear set 209, so as to improve the stability of the portion of the medium-speed transmission shaft 202 located between the primary planetary gear set 208 and the secondary planetary gear set 209. The two planetary gear sets can play a partial supporting role, providing the medium-speed transmission shaft 202 with supporting force from the gear box housing 201 and the inner wall of the support cylinder 203.

[0029] like Figure 2 and Figure 7 As shown: the eccentric wheel 301 is located directly above the piston 307, and the central axis of the eccentric wheel 301 coincides with the central axis of the piston 307. During the rotation of the eccentric wheel 301, the distance from a point on its circumference to the central axis changes. This changing distance will push the piston 307 to perform reciprocating linear motion. Since the central axes coincide, the direction of force transmission is basically along the axial direction of the piston 307, reducing the lateral force component, thereby making the motion transmission more efficient and the energy loss relatively small.

[0030] like Figure 2 As shown: a fast transmission shaft 210 is provided at one end of the gear box housing 201, and the fast transmission shaft 210 is connected to the power output shaft 2022 through gears, wherein the gear diameter and the number of turns provided on the power output shaft 2022 are both larger than and more than the gear diameter and the number of turns provided on the fast transmission shaft 210, and the two are meshed to achieve a variable speed transmission effect, and the power output shaft 2022 drives the fast transmission shaft 210, and the top of the fixed frame 1 is fixedly connected to a delivery pump 311, and the delivery pump 311 is connected to an external power supply. The top of the fixed frame 1 is fixedly connected to a storage box 312, and the output end of the delivery pump 311 is fixedly connected to a feed pipe 305, and the end of the feed pipe 305 away from the delivery pump 311 is fixedly connected to the storage tank 303.

[0031] like Figure 5 , Figure 6 and Figure 7As shown: the outer wall of the storage tank 303 is fixedly connected with a discharge pipe 306, and the end of the discharge pipe 306 away from the storage tank 303 is located inside 203 and the support tube, and the discharge pipe 306 is provided with two branch pipes, and the two branch pipes are respectively located on one side of the primary planetary gear set 208 and the secondary planetary gear set 209. When the eccentric wheel 301 rotates, the lubricating oil lubricates the primary planetary gear set 208 and the secondary planetary gear set 209 along the discharge pipe 306 and the two branch pipes, thereby reducing the friction between the gears and reducing the wear between the gears. A pipeline groove 304 is provided on the inner wall of the fixed frame 1, and the inner wall of the pipeline groove 304 is matched with the outer wall of the discharge pipe 306, so as to avoid the discharge pipe 306 from being offset due to the shaking of the equipment during use, thereby preventing the lubricating oil from failing to reach the designated location.

[0032] Working principle: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, during the use of the wear-resistant wind turbine gearbox, as the blades rotate, the medium-speed transmission shaft 202 connected to the blades rotates with the blades. Since the blades generate huge torque when rotating, the medium-speed transmission shaft 202 may be bent or shifted under force. When the medium-speed transmission shaft 202 bends, it will cause the position of the connecting rod 205 to shift. At this time, the connecting rod 205 compresses or pulls the return spring 207. At this time, the elastic force of the return spring 207 itself applies a pulling force or a pushing force to the connecting rod 205, thereby supporting the connecting rod 205, and then supporting the medium-speed transmission shaft 202 through the connecting rod 205, so as to avoid the medium-speed transmission shaft 202 from shifting after being stressed, and reduce the probability of deformation of the tooth profile and tooth direction curve of the gear, so as to avoid the gear from generating eccentric load during meshing, and then avoid excessive local stress on the tooth surface, causing micro pitting on the tooth surface. At the same time, the rotation of the medium-speed transmission shaft 202 drives the eccentric wheel 301 to rotate synchronously. When the eccentric wheel 301 When one end of the wheel 301 away from the medium-speed transmission shaft 202 collides with the top of the piston 307, the piston 307 is forced to move toward the bottom of the storage tank 303. At this time, the lubricating oil below the piston 307 is squeezed by the piston 307 and enters the inside of the feed hole 309. As the piston 307 moves, the lubricating oil inside the feed hole 309 gradually accumulates, and eventually enters the inside of the storage tank 303 along the discharge hole 310, and is located above the bottom moving block of the piston 307. As the eccentric wheel 301 rotates, the eccentric wheel 301 and the piston 307 gradually move away from each other. At this time, under the action of the conical spring 308, the piston 307 gradually moves toward the top of the storage tank 303. As the piston 307 is lifted, the lubricating oil above the piston 307 is discharged along the discharge port to the outside of the storage tank 303. As the medium-speed transmission shaft 202 rotates, the eccentric wheel 301 intermittently collides with the piston 307, thereby realizing intermittent supply of lubricating oil.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A wear-resistant wind turbine gearbox, comprising a fixing frame (1), characterized in that: A support structure (2) is arranged above the fixing frame (1), and a lubrication structure (3) is arranged inside the support structure (2); The support structure (2) comprises a gearbox housing (201) fixedly connected to the top of the fixing frame (1); the inner side wall of the gearbox housing (201) is rotatably connected to a power input shaft (2021); the inner side wall of the gearbox housing (201) is fixedly connected to a support cylinder (203); a medium-speed transmission shaft (202) is arranged inside the support cylinder (203); the inner side wall of the support cylinder (203) is fixedly connected to a fixing seat (204); and the outer side wall of the fixing seat (204) is rotatably connected to a connecting rod. (205), the inner wall of the connecting rod (205) is rotatably connected to the outer wall of the medium-speed transmission shaft (202), the outer wall of the fixing seat (204) is provided with a notch (206), the outer wall of the fixing seat (204) is fixedly connected to a return spring (207), the end of the return spring (207) away from the fixing seat (204) is fixedly connected to the outer wall of the connecting rod (205), and the end of the gear box housing (201) away from the power output shaft (2021) is provided with a power output shaft (2022).

2. The wear-resistant wind turbine gearbox according to claim 1, characterized in that: The lubrication structure (3) comprises an eccentric wheel (301) fixedly connected to the outer wall of the power input shaft (2021); a fixing hole (302) is formed through the outer wall of the gearbox housing (201); a storage tank (303) is fixedly connected to the top of the fixing frame (1); an end of the storage tank (303) away from the fixing frame (1) is located inside the gearbox housing (201); a piston (307) is slidably connected to the top of the storage tank (303); a conical spring (308) is fixedly connected to the inner top of the storage tank (303); an end of the conical spring (308) away from the storage tank (303) is fixedly connected to the outer wall of the piston (307); a feed hole (309) is formed on the inner wall of the piston (307); and a discharge hole (310) is formed through the outer wall of the piston (307).

3. The wear-resistant wind turbine gearbox according to claim 1, characterized in that: The inner side wall of the gear box housing (201) is provided with a primary planetary gear set (208), and the inner side wall of the support cylinder (203) is provided with a secondary planetary gear set (209).

4. The wear-resistant wind turbine gearbox according to claim 2, characterized in that: The eccentric wheel (301) is located directly above the piston (307), and the central axis of the eccentric wheel (301) coincides with the central axis of the piston (307).

5. The wear-resistant wind turbine gearbox according to claim 1, characterized in that: A fast transmission shaft (210) is provided at one end of the gear box housing (201), and the fast transmission shaft (210) is transmission-connected to a power output shaft (2022) via a gear.

6. The wear-resistant wind turbine gearbox according to claim 2, characterized in that: A delivery pump (311) is fixedly connected to the top of the fixed frame (1), a storage box (312) is fixedly connected to the top of the fixed frame (1), an output end of the delivery pump (311) is fixedly connected to a feed pipe (305), and an end of the feed pipe (305) away from the delivery pump (311) is fixedly connected to a storage tank (303).

7. The wear-resistant wind turbine gearbox according to claim 2, characterized in that: The outer wall of the storage tank (303) is fixedly connected to a discharge pipe (306), and one end of the discharge pipe (306) away from the storage tank (303) is located inside the gear box housing (201).

8. The wear-resistant wind turbine gearbox according to claim 7, characterized in that: The inner side wall of the fixing frame (1) is provided with a pipeline groove (304), and the inner side wall of the pipeline groove (304) fits with the outer side wall of the discharge pipe (306).

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