Oil supply lubricating structure for planet carrier bearing

Abstract

The utility model relates to the technical field of wind power gear boxes, in particular to a planet carrier bearing oil supply lubricating structure which comprises a box body, a planet carrier located in the box body and a bearing installed on the planet carrier, an installation space is formed between the inner wall of the box body and a shaft shoulder of the planet carrier, and the bearing is located in the installation space. An end cover is fixed to the end face of the box body, a vertical oil supply pipeline is arranged in the end cover, and the oil supply pipeline is communicated into the installation space of the bearing. According to the scheme, the oil supply pipeline structure can be optimized for the wind power gear box with the large single unit capacity, the lubricating effect on the bearing is improved, bearing abrasion is reduced, the service life of the bearing is prolonged, the transmission efficiency of the bearing is improved, meanwhile, the design difficulty of gear box parts is reduced, and cost is effectively saved.

Description

Technical Field

[0001] This utility model relates to the technical field of wind turbine gearboxes, specifically to an oil supply and lubrication structure for planetary carrier bearings. Background Technology

[0002] The planetary carrier of a wind turbine gear is a key component in a wind turbine planetary gear transmission system. It provides support and mounting positions for the planetary gears, allowing them to rotate around the central axis of the carrier. It also plays a role in balancing and distributing the load, ensuring that the load is evenly distributed among the planetary gears, thereby improving the load-bearing capacity and efficiency of the transmission system.

[0003] In planetary gear transmission, lubricating oil plays a crucial role. Good lubrication forms an oil film on the surfaces of transmission components such as bearings, reducing the coefficient of friction and minimizing direct metal-to-metal contact, thereby significantly reducing wear and extending the service life of planetary gear bearings and related transmission components. For example, the existing technology "A Planetary Carrier Oil Supply System" (Publication No.: CN116733952A) provides oil supply channels on both the planetary carrier and the housing, allowing lubricating oil to flow from the housing's supply channels into the planetary carrier's supply channels. The lubricating oil then flows into the bearings through the gap between the planetary carrier and the bearing mounting surfaces, thus lubricating the bearings. However, the existing technology still has the following technical problems:

[0004] 1. In the existing technology, part of the oil supply channel is drilled through the body of the planetary carrier. However, for wind turbine gearboxes with large single unit capacity, in order to meet the requirements of structural compactness and lighter weight, the web thickness of the planetary carrier usually needs to be made thinner. Therefore, the oil supply pipeline cannot be set on the planetary carrier according to the solution in the existing technology, resulting in ineffective lubrication of the bearing and affecting the bearing life. At the same time, the planetary carrier also has weight reduction holes, which will further affect the setting route of the oil supply pipeline and increase the design difficulty.

[0005] 2. In the existing technology, the lubricating oil still needs to flow into the bearing through the gap between the planetary carrier and the bearing mounting surface. The flow rate of the lubricating oil cannot be controlled, and it has a certain impact on the lubrication efficiency and effect. Utility Model Content

[0006] This utility model provides a planetary carrier bearing oil supply and lubrication structure, which can solve the problem that in the existing planetary carrier lubrication system, when used in large single-unit capacity wind turbine gearboxes, it is impossible to install oil supply pipelines on the planetary carrier, resulting in ineffective lubrication of the bearing and reduced bearing life.

[0007] This application provides the following technical solution: a planetary carrier bearing oil supply and lubrication structure, including a housing, a planetary carrier located inside the housing, and a bearing mounted on the planetary carrier. An installation space is formed between the inner wall of the housing and the shoulder of the planetary carrier, and the bearing is located in the installation space. An end cover is fixed on the end face of the housing, and a vertical oil supply pipeline is provided inside the end cover, which is connected to the installation space of the bearing.

[0008] Beneficial effects:

[0009] 1. Ensure effective lubrication of bearings and extend their service life. Existing technologies that involve creating oil supply channels within the planetary carrier body are difficult to implement due to the thinning of the planetary carrier web and the presence of weight-reduction holes. This solution, however, places the oil supply lines within the end caps, eliminating reliance on the internal space of the planetary carrier body. This effectively avoids structural limitations of the planetary carrier, optimizes the planetary carrier installation structure, and eliminates the need to find space on the planetary carrier to install the oil supply lines. Furthermore, the oil supply lines connect directly to the bearing installation space, providing lubrication directly to the bearings. This ensures that the lubricating oil accurately reaches the areas requiring lubrication, guaranteeing good bearing lubrication, reducing bearing wear, improving transmission efficiency, reducing operating noise, and ultimately extending bearing life and improving the reliability of the wind turbine gearbox.

[0010] 2. Improved Lubrication: The flow limiter precisely controls the amount of lubricating oil flowing into the bearing installation space according to the actual lubrication needs of the bearing. This avoids problems such as lubricating oil waste caused by excessive oil supply, as well as potential oil splashing and increased loss of churning power. It also prevents insufficient oil supply from affecting lubrication, ensuring the bearing is always in good lubrication condition and further extending its service life.

[0011] 3. Reduced design complexity and cost savings. Eliminating the need for oil supply channels on the planetary carrier simplifies the manufacturing process, reduces the steps involved in machining complex oil supply channels, lowers the manufacturing difficulty and cost of the planetary carrier, and also helps improve the manufacturing precision and quality of the planetary carrier.

[0012] Furthermore, an oblique hole is provided at the connection between the oil supply pipeline and the bearing installation space, and the flow limiter is fixed in the oblique hole.

[0013] Beneficial effects: Angled holes allow lubricating oil to flow into the bearing mounting space at a specific angle, better aligning it with the parts of the bearing that require lubrication, such as the raceways and rolling elements. Compared to vertical holes, angled holes allow oil to flow more smoothly along the internal structure of the bearing, improving the targetedness and effectiveness of lubrication, ensuring that the lubricating oil is evenly distributed on the bearing working surface, and reducing localized wear.

[0014] Furthermore, the outer ring of the bearing is transition-fitted to the inner wall of the housing, and the inner ring of the bearing is interference-fitted to the shoulder of the planetary carrier.

[0015] Beneficial effects: Interference fit enables precise positioning of the bearings on the housing and planetary carrier, ensuring accurate bearing placement within the installation space and preventing axial or radial displacement of the bearings during gearbox operation. This guarantees the relative positional accuracy between the planetary carrier and the housing, improving the stability and reliability of the entire transmission system. Furthermore, interference fit provides a reliable connection, forming a tight integral connection between the bearings, housing, and planetary carrier. This facilitates effective load transfer and withstands various forces generated by the planetary carrier during operation, such as radial forces, axial forces, and bending moments. It reduces vibration and noise caused by loose connections, improving gearbox performance.

[0016] Furthermore, the planetary carrier is provided with an annular countersunk hole, and a bushing is provided inside the annular countersunk hole. One end of the inner ring of the bearing is in contact with the end face of the bushing, and the other end of the bushing is in contact with the bottom surface of the annular countersunk hole.

[0017] Beneficial effects: The bushing acts as a buffer layer between the end face of the bearing inner ring and the planetary carrier, reducing wear that may occur from direct contact between the bearing inner ring end face and the planetary carrier. Especially during gearbox operation, it can effectively prevent damage to the planetary carrier caused by the fretting or vibration of the bearing inner ring, thereby extending the service life of the planetary carrier. The annular countersunk hole and bushing provide a precise positioning reference for the bearing inner ring, ensuring the accurate installation position of the bearing inner ring on the planetary carrier, thereby improving the installation accuracy of the entire planetary carrier bearing system. This helps to ensure the relative positional accuracy of the planetary carrier's rotation axis with other components, improving the transmission smoothness of the gearbox.

[0018] Furthermore, an oil baffle is also installed on the planetary carrier. The oil baffle has a protrusion on one side of the bearing, and the end cap presses the oil baffle tightly against the inner ring end face of the bearing.

[0019] Beneficial effects: The oil baffle effectively prevents lubricating oil from leaking out from the gap between the bearing inner ring and the planetary carrier. The end cap presses the oil baffle tightly against the bearing inner ring end face, forming a sealed structure that enhances the sealing effect, reduces lubricating oil leakage, helps maintain good lubrication of the bearing, and prevents lubricating oil leakage from contaminating other components inside the gearbox. Attached Figure Description

[0020] Figure 1 This is the main structural view of the present invention. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method:

[0022] The markings in the accompanying drawings of the instruction manual include: housing 1, planetary carrier 2, end cap 3, bearing 4, flow restrictor 5, bushing 6, and oil baffle 7.

[0023] Example 1

[0024] like Figure 1 As shown, a planetary carrier bearing oil lubrication structure includes a housing 1, a planetary carrier 2 located inside the housing 1, and a bearing 4 mounted on the planetary carrier 2. The housing 1 has a mounting hole, and the inner wall of the mounting hole forms a mounting space with the shoulder of the planetary carrier 2, so that the bearing 4 is located in the mounting space. The outer circular surface of the outer ring of the bearing 4 is transitionally fitted with the inner wall surface of the mounting hole in the housing 1, and the inner circular surface of the inner ring of the bearing 4 is interference-fitted with the outer circular surface of the shoulder of the planetary carrier 2.

[0025] An end cap 3 is fixed to the end face of the housing 1. Figure 1 In the middle, the right end face of the end cover 3 is fitted with the housing 1. The right end face of the end cover 3 is also provided with a protruding stop end face, which is used to fit with the outer ring end face of the bearing 4. The end cover 3 is provided with a vertical oil supply line, which is connected to the installation space of the bearing 4. The connection between the oil supply line and the installation space of the bearing 4 is connected with an oblique hole. A flow limiter 5 is fixed in the oblique hole, and the nozzle of the flow limiter 5 is aligned with the roller of the bearing 4.

[0026] An oil baffle 7 is also installed on the planetary carrier 2. The oil baffle 7 passes through the shoulder of the planetary carrier 2, and the oil baffle 7 has a protrusion on the side of the bearing 4. When the end cover 3 presses the oil baffle 7 tightly, Figure 1 The protrusion of the middle oil plate 7 fits against the left end face of the inner ring of the bearing 4.

[0027] The planetary carrier 2 is also provided with an annular countersunk hole, and a bushing 6 is provided inside the annular countersunk hole. Figure 1 The outer circumference of the inner bushing 6 is in contact with the annular wall of the annular countersunk hole, the left end face of the bushing 6 is in contact with the right end face of the inner ring of the bearing 4, and the right end face of the bushing 6 is in contact with the bottom surface of the annular countersunk hole.

[0028] The fuel supply method in this application is as follows:

[0029] Lubricating oil flows downwards from the vertical oil supply line on the end cover 3, and then passes through the flow restrictor 5. The flow restrictor 5 controls the amount of lubricating oil flowing into the bearing 4 mounting space, and the nozzle of the flow restrictor 5 is aligned with the rollers of the bearing 4, ensuring that the bearing 4 is always in a good lubrication state. This solution places the oil supply line inside the end cover 3, without relying on the internal space of the planetary carrier 2 body, effectively avoiding the structural limitations of the planetary carrier 2, optimizing the mounting structure of the planetary carrier 2, eliminating the need to find space on the planetary carrier 2 to set the oil supply line, and the oil supply line connects to the mounting space of the bearing 4, directly providing lubrication to the bearing 4, ensuring that the lubricating oil can accurately reach the parts that need lubrication, ensuring good lubrication of the bearing 4, helping to reduce bearing 4 wear, improve transmission efficiency, reduce operating noise, and thus extend the service life of the bearing 4 and the reliability of the wind turbine gearbox. Moreover, not setting the oil supply channel on the planetary carrier 2 simplifies the manufacturing process of the planetary carrier 2, reduces the steps of machining complex oil supply channels on the planetary carrier 2, reduces the manufacturing difficulty and cost of the planetary carrier 2, and also helps to improve the manufacturing precision and quality of the planetary carrier 2.

[0030] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A planetary carrier bearing oil supply and lubrication structure, characterized in that: The device includes a housing, a planetary carrier located inside the housing, and a bearing mounted on the planetary carrier. An installation space is formed between the inner wall of the housing and the shoulder of the planetary carrier, and the bearing is located within the installation space. An end cap is fixed to the end face of the housing, and a vertical oil supply line is provided inside the end cap. The oil supply line is connected to the installation space of the bearing, and a flow limiter is provided at the connection between the oil supply line and the installation space.

2. The planetary carrier bearing oil supply and lubrication structure according to claim 1, characterized in that: An oblique hole is provided at the connection between the oil supply pipeline and the bearing installation space, and the flow limiter is fixed in the oblique hole.

3. The planetary carrier bearing oil supply and lubrication structure according to claim 2, characterized in that: The outer ring of the bearing is transition-fitted to the inner wall of the housing, and the inner ring of the bearing is interference-fitted to the shoulder of the planetary carrier.

4. The planetary carrier bearing oil supply and lubrication structure according to claim 3, characterized in that: The planetary carrier is provided with an annular countersunk hole, and a bushing is provided inside the annular countersunk hole. One end of the inner ring of the bearing is in contact with the end face of the bushing, and the other end of the bushing is in contact with the bottom surface of the annular countersunk hole.

5. The planetary carrier bearing oil supply and lubrication structure according to claim 4, characterized in that: An oil baffle is also installed on the planetary carrier. The oil baffle has a protrusion on one side of the bearing, and the end cap presses the oil baffle tightly against the inner ring end face of the bearing.

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