Yaw gearbox output end sealing assembly

Abstract

The utility model discloses a yaw gear box output end sealing assembly, which relates to the technical field of gear boxes and comprises a box body, and an inner step is arranged on one side of the box body. The tapered roller bearing is mounted in the inner step; one end of the output gear shaft penetrates through the tapered roller bearing and is mounted in the box body; the bearing sealing piece is installed in the inner step and used for blocking the tapered roller bearing, and the distance between the bottom end face of the tapered roller bearing and the upper end face of the gear step of the output gear shaft is shortened. According to the yaw gearbox output end sealing assembly, the technical problem that due to the fact that the distance between a tapered roller bearing and a gear stress point is relatively large, the bearing capacity is large in the working process, and the bearing capacity is likely to be insufficient is solved; compared with the prior art, the distance between the bottom end face of the tapered roller bearing and the upper end face of the gear step of the output gear shaft is obviously reduced, so that the tapered roller bearing is closer to a gear stress point, and the bearing capacity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear boxes, in particular to an output end sealing component of a yaw gear box. Background Art

[0002] As a key component of a wind turbine generator set, the yaw gearbox mainly plays the role of deceleration and power transmission. Its stability and load-bearing capacity directly affect the efficiency and safety of the entire wind power generation system. In the existing technology, such as Figure 1 As shown, a seal is formed between the gear shaft 02 and the output end cover 03 by an oil seal 01, and the output end cover 03 is connected to the output housing 05 by bolts 04 to prevent lubricating oil leakage and protect the tapered roller bearing 2 from the external environment.

[0003] However, the existing sealing components have the following deficiencies:

[0004] Since the distance from the lower end face of the output end cover 03 to the upper end face of the gear shaft 02 is part of the customer's installation dimension, plus the height of the output end cover 03 itself, the tapered roller bearing 2 is relatively far away from the force-bearing point of the gear, and the force it bears during operation is large, which may cause insufficient load-bearing capacity. Especially under high-load conditions, it is necessary to replace the tapered roller bearing 2 with a larger model to meet the load-bearing requirements, thereby increasing cost and complexity.

[0005] Therefore, how to provide a sealing assembly at the output end of the yaw gearbox to make the lower tapered roller bearing closer to the gear stress point, thereby improving the load-bearing capacity and extending the service life of the gearbox is a technical problem that technicians in this field currently need to solve. Utility Model Content

[0006] The purpose of the utility model is to provide a sealing assembly at the output end of a yaw gearbox, which solves the technical problem that the tapered roller bearing is relatively far away from the force-bearing point of the gear, and bears a large force during operation, which may cause insufficient load-bearing capacity.

[0007] To achieve the above-mentioned purpose, the present invention provides a yaw gearbox output end sealing assembly, comprising:

[0008] A box body, wherein one side of the box body is provided with an inner step;

[0009] A tapered roller bearing is installed in the inner step;

[0010] An output gear shaft, one end of which passes through the tapered roller bearing and is installed in the housing;

[0011] A bearing seal is installed in the inner step and is used to seal the tapered roller bearing, thereby shortening the distance between the bottom end surface of the tapered roller bearing and the upper end surface of the gear step of the output gear shaft.

[0012] Preferably, the bearing seal comprises:

[0013] A first annular member, wherein the inner wall of the lower end of the inner step is provided with an installation inner hole, and the top of the first annular member is installed in the installation inner hole;

[0014] The second annular member is connected to the bottom of the first annular member, and the two ends of the second annular member are correspondingly fitted to the lower end surface of the tapered roller bearing and the upper end surface of the gear step. The second annular member is provided with a through hole for the output gear shaft to pass through. The first annular member and the second annular member are integrally formed parts.

[0015] Preferably, the first annular member includes a first annular plate and a first circular plate, the second annular member includes a second annular plate and a second circular plate, one side of the first circular plate is connected to the inner wall of the bottom end of the first annular plate, and the other side is connected to the top outer wall of the second annular plate, the second circular plate is arranged on the inner side of the second annular plate, and the through hole is arranged at the center of the second circular plate.

[0016] Preferably, the upper end surface of the first annular plate is tightly fitted to the inner wall of the mounting inner hole, and the interference fit range is 1-2 mm.

[0017] Preferably, the aperture of the second annular plate is smaller than the outer diameter of the bottom end of the tapered roller bearing, thereby achieving a clearance fit between the second annular plate and the outer circumferential surface of the tapered roller bearing.

[0018] Preferably, the first annular plate and the tapered roller bearing are clearance-fitted.

[0019] Preferably, the first annular plate and the mounting inner hole are clearance-fitted.

[0020] Compared with the above-mentioned background technology, the utility model provides a yaw gearbox output end sealing assembly, which significantly reduces the distance between the bottom end face of the tapered roller bearing and the upper end face of the gear step of the output gear shaft compared with the prior art while ensuring the installation dimensions, thereby making the tapered roller bearing closer to the gear stress point and improving the load-bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0022] Figure 1A schematic diagram of the structure of the yaw gearbox output end sealing assembly provided by the prior art;

[0023] Figure 2 A schematic diagram of the structure of a sealing assembly at the output end of a yaw gearbox provided in an embodiment of the present utility model;

[0024] Figure 3 for Figure 2 A is a partial enlarged schematic diagram.

[0025] 01-oil seal, 02-gear shaft, 03-output end cover, 04-bolt, 05-output box;

[0026] 1-housing, 2-tapered roller bearing, 3-output gear shaft, 4-bearing seal;

[0027] 11-inner step, 12-installation inner hole;

[0028] 31-Gear Steps;

[0029] 41 - through hole, 42 - first annular plate, 43 - first circular plate, 44 - second annular plate, 45 - second circular plate. DETAILED DESCRIPTION

[0030] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0031] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0032] See also Figure 2-Figure 3 The present application provides a yaw gearbox output end sealing assembly, including a box body 1, with an inner step 11 provided on one side of the box body 1; a tapered roller bearing 2, installed in the inner step 11; an output gear shaft 3, one end of which passes through the tapered roller bearing 2 and is installed in the box body 1; a bearing seal 4, installed in the inner step 11, for sealing the tapered roller bearing 2, thereby shortening the distance between the bottom end face of the tapered roller bearing 2 and the upper end face of the gear step 31 of the output gear shaft 3.

[0033] Specifically, an inner step 11 is designed at the bottom of housing 1, and a tapered roller bearing 2 is mounted within this step 11, supporting and guiding the rotation of output gear shaft 3. Tapered roller bearing 2 can withstand large radial and axial loads, ensuring the stability and reliability of output gear shaft 3 at high speeds.

[0034] The output gear shaft 3 is a key component for power transmission. One end of the output gear shaft 3 passes through the tapered roller bearing 2 and is installed in the housing 1. The gear step 31 provided on the upper end of the output gear shaft 3 further enhances the sealing effect by closely fitting with the bearing seal 4.

[0035] The bearing seal 4 is installed within the inner step 11 and directly seals against the outside of the tapered roller bearing 2. This not only effectively prevents external impurities (such as dust and moisture) from entering the bearing, extending its service life, but also optimizes the internal space layout of the gearbox by shortening the distance between the bottom end face of the tapered roller bearing 2 and the upper end face of the gear step 31 of the output gear shaft 3, improving the overall compactness of the structure.

[0036] Therefore, the yaw gearbox output end sealing assembly provided in the present application significantly reduces the distance between the bottom end face of the tapered roller bearing 2 and the upper end face of the gear step 31 of the output gear shaft 3 compared with the prior art while ensuring the installation dimensions, thereby bringing the tapered roller bearing 2 closer to the gear stress point and improving the load-bearing capacity.

[0037] Based on the above embodiment, the bearing seal 4 includes: a first annular member, the inner wall of the lower end of the inner step 11 is provided with a mounting inner hole 12, and the top of the first annular member is installed in the mounting inner hole 12; a second annular member is connected to the bottom of the first annular member, and the two ends of the second annular member are correspondingly attached to the lower end face of the tapered roller bearing 2 and the upper end face of the gear step 31. The second annular member is provided with a through hole 41 for the output gear shaft 3 to pass through. The annular member and the second annular member are an integrally formed part.

[0038] Specifically, the top of the first annular member is installed in the installation inner hole 12 of the inner wall of the lower end of the inner step 11. The restraining effect of the installation inner hole 12 effectively prevents the first annular member from escaping from the installation inner hole 12.

[0039] The second annular member is directly connected to the bottom of the first annular member, and the two are tightly connected through integrated molding technology to form an integral structure, thereby simplifying the installation process and improving the overall strength of the seal.

[0040] The ends of the second annular member fit tightly against the lower end surface of the tapered roller bearing 2 and the upper end surface of the gear step 31, respectively. This effectively prevents external impurities (such as dust and moisture) from entering the gearbox through the gap between the bearing and the gear step. The second annular member also features a through-hole 41, whose diameter is larger than that of the output gear shaft 3, ensuring that the output gear shaft 3 can pass smoothly through the seal without obstruction.

[0041] Based on the above embodiment, the first annular member includes a first annular plate 42 and a first circular plate 43, and the second annular member includes a second annular plate 44 and a second circular plate 45. One side of the first circular plate 43 is connected to the bottom inner wall of the first annular plate 42, and the other side is connected to the top outer wall of the second annular plate 44. The second circular plate 45 is arranged on the inner side of the second annular plate 44, and the through hole 41 is arranged at the center of the second circular plate 45; the first annular plate 42 and the mounting inner hole 12 are clearance-fitted.

[0042] Specifically, the first annular plate 42 is mounted in the mounting inner hole 12 of the inner wall at the lower end of the inner step 11. A clearance fit is adopted between the first annular plate 42 and the mounting inner hole 12 to reduce friction and increase the service life of the first annular plate 42.

[0043] The top outer wall of the second annular plate 44 fits tightly against the first circular plate 43, forming a sealing interface. The second circular plate 45 is located inside the second annular plate 44 and has a through hole 41 at its center. The diameter of the through hole 41 ensures that the output gear shaft 3 can pass through the seal smoothly without obstruction. At the same time, the upper end face of the first annular plate 42 fits tightly against the inner wall of the mounting inner hole 12, with an interference fit of 1-2mm. The upper end face of the second circular plate 45 fits against the lower end face of the tapered roller bearing 2, and the lower end face of the second circular plate 45 fits against the upper end face of the gear step 31. The first annular plate 42, the first circular plate 43, the second annular plate 44, and the second circular plate 45 are connected end to end, thereby forming a sealing barrier.

[0044] Furthermore, through the cooperation of the first annular plate 42, the first circular plate 43, the second annular plate 44 and the second circular plate 45 of the present application, the sealing of the tapered roller bearing 2 is achieved, and the installation dimensions consistent with the prior art (the distance from the first circular plate 43 to the upper end face of the output gear shaft 3) are guaranteed, and the distance between the bottom end face of the tapered roller bearing 2 and the upper end face of the gear step 31 of the output gear shaft 3 is significantly reduced compared with the prior art, thereby making the tapered roller bearing 2 closer to the gear force point and improving the load-bearing capacity.

[0045] Based on the above embodiment, the thickness of the first annular plate 42 is less than the depth of the mounting inner hole 12, and the first annular plate 42 and the second annular plate 44 are both clearance-fitted with the outer peripheral surface of the tapered roller bearing 2. Since the outer diameter of the bottom end of the tapered roller bearings 2 of the same model of different brands may be different, the installation dimensions of the same model of bearings of different brands can be compatible by setting the gap.

[0046] That is to say, the thickness of the first annular plate 42 is designed to be smaller than the depth of the mounting inner hole 12, thereby achieving a clearance fit between the first annular plate 42 and the outer circumference of the tapered roller bearing 2, and the aperture of the second annular plate 44 is smaller than the outer diameter of the bottom end of the tapered roller bearing 2, thereby achieving

[0047] The second annular plate 44 and the outer peripheral surface of the tapered roller bearing 2 are clearance-fitted.

[0048] While tapered roller bearings 2 of the same model from different brands should theoretically have identical dimensions, actual production often involves manufacturing tolerances. The clearance fit between the first and second annular plates 42, 44 and the outer circumference of the tapered roller bearing 2 allows the bearing seal 4 to accommodate even minor dimensional differences, thus accommodating the installation requirements of tapered roller bearings 2 from different brands. Furthermore, when the tapered roller bearing 2 needs to be replaced, the clearance fit makes disassembly and installation easier and faster, reducing maintenance costs and time.

[0049] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0050] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A yaw gearbox output end sealing assembly, characterized in that: include: A box body (1), wherein one side of the box body (1) is provided with an inner step (11); A tapered roller bearing (2) is installed in the inner step (11); An output gear shaft (3), one end of which passes through the tapered roller bearing (2) and is installed in the housing (1); A bearing seal (4) is installed in the inner step (11) and is used to seal the tapered roller bearing (2) to shorten the distance between the bottom end surface of the tapered roller bearing (2) and the upper end surface of the gear step (31) of the output gear shaft (3); The bearing seal (4) comprises: A first annular member, wherein the inner wall of the lower end of the inner step (11) is provided with an installation inner hole (12), and the top of the first annular member is installed in the installation inner hole (12); a second annular member connected to the bottom of the first annular member, with two ends of the second annular member correspondingly attached to the lower end surface of the tapered roller bearing (2) and the upper end surface of the gear step (31), the second annular member being provided with a through hole (41) for the output gear shaft (3) to pass through, and the first annular member and the second annular member being an integrally formed member; The first annular member includes a first annular plate (42) and a first circular plate (43); the second annular member includes a second annular plate (44) and a second circular plate (45); one side of the first circular plate (43) is connected to the inner wall of the bottom end of the first annular plate (42); the other side is connected to the outer wall of the top end of the second annular plate (44); the second circular plate (45) is arranged on the inner side of the second annular plate (44); and the through hole (41) is arranged at the center of the second circular plate (45).

2. The yaw gearbox output end sealing assembly according to claim 1, characterized in that: The upper end surface of the first annular plate (42) is tightly fitted to the inner wall of the mounting inner hole (12), and the interference fit range is 1-2 mm.

3. The yaw gearbox output end sealing assembly according to claim 1, characterized in that: The aperture of the second annular plate (44) is smaller than the outer diameter of the bottom end of the tapered roller bearing (2), so that the second annular plate (44) and the outer peripheral surface of the tapered roller bearing (2) are clearance-fitted.

4. The yaw gearbox output end sealing assembly according to claim 1, characterized in that: The first annular plate (42) and the tapered roller bearing (2) are clearance-fitted.

5. The yaw gearbox output end sealing assembly according to claim 1, characterized in that: The first annular plate (42) and the mounting inner hole (12) are clearance-fitted.

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