Bearing assembly and thrust bearing

Abstract

The application provides a bearing bush assembly and a thrust bearing. The thrust bearing comprises a mirror plate, a plurality of first bearing bushes, the plurality of first bearing bushes are arranged towards the mirror plate, are arranged at intervals along the circumference of the thrust bearing, and are in sliding friction with the mirror plate; a plurality of second bearing bushes, the plurality of second bearing bushes are arranged towards the mirror plate and are arranged between two adjacent first bearing bushes; in a projection plane perpendicular to the axial direction of the thrust bearing, the projection area of the second bearing bush is smaller than the projection area of the first bearing bush; wherein the second bearing bush has a first side surface facing the mirror plate and a second side surface, the first side surface is higher than the side of the first bearing bush facing the mirror plate in the axial direction of the thrust bearing and is in sliding friction with the mirror plate; the second side surface is arranged lower than the first side surface in the axial direction of the thrust bearing, and the second side surface is located upstream of the first side surface in the rotating direction of the mirror plate. The application aims to solve the technical problem of inconsistent temperature of thrust pads in the prior art.

Description

Technical Field

[0001] This application relates to the field of bearing technology, specifically to a bearing bush assembly and a thrust bearing. Background Technology

[0002] Thrust bearings are a crucial component of generator sets, supporting the axial load of rotating components. In a thrust bearing, the upper surface of the thrust bearing pad mates with the rotating component's mirror plate to support the axial load, while the lower surface is supported by a bearing support. During operation, the rotating mirror plate carries cold lubricating oil into the gap between the thrust bearing pad and the mirror plate, forming a hydrodynamic oil film that supports the axial load. This hydrodynamic oil film generates heat due to internal friction, causing its temperature to rise. As the shaft rotates axially, the hot oil film from the upstream bearing pad easily flows into the downstream bearing pad, resulting in less cold oil in the downstream pad. This causes the downstream bearing pad's temperature to rise, leading to temperature inconsistencies between adjacent thrust bearing pads and reducing the bearing's load-bearing capacity. Summary of the Invention

[0003] This application provides a bearing assembly and a thrust bearing, aiming to solve the technical problem of inconsistent thrust bearing temperature in the prior art.

[0004] This application discloses a bearing assembly for a thrust bearing, the thrust bearing including a mirror plate, and the bearing assembly comprising:

[0005] A plurality of first bearing bushes are disposed facing the mirror plate, spaced apart circumferentially along the thrust bearing, and slide and rub against the mirror plate;

[0006] A plurality of second bearing bushes are disposed facing the mirror plate, and each second bearing bush is disposed between two adjacent first bearing bushes; in the axial projection plane perpendicular to the thrust bearing, the projected area of ​​the second bearing bush is smaller than the projected area of ​​the first bearing bush.

[0007] The second bearing bush has a first side and a second side facing the mirror plate. The first side is higher than the side of the first bearing bush facing the mirror plate in the axial direction of the thrust bearing and slides and rubs against the mirror plate. The second side is lower than the first side in the axial direction of the thrust bearing and is located upstream of the first side in the rotational direction of the mirror plate.

[0008] Optionally, the first side and the second side are arranged in parallel.

[0009] Optionally, the first side and the second side are inclined to each other.

[0010] Optionally, the first side is a plane, and the second side is a curved surface.

[0011] Optionally, a hot oil outlet is defined between the first bearing bush and the mirror plate, and the second side is axially lower than the hot oil outlet of the thrust bearing.

[0012] Optionally, the second bearing bush has a first circumferential gap with the first bearing bush located upstream of it in the rotational direction; the second bearing bush has a second circumferential gap with the first bearing bush located downstream of it in the rotational direction.

[0013] Optionally, the bearing assembly includes: a plurality of first support members, each of which is correspondingly connected to a first bearing; a plurality of second support members, each of which is correspondingly connected to a second bearing; wherein the first support members are rigid or elastic support members; and the second support members are elastic support members.

[0014] Optionally, the second support member includes a positioning rod and a spring, the second bearing bush is slidably engaged with the positioning rod on the corresponding second support member, and the second bearing bush is fixedly connected to the spring on the corresponding second support member.

[0015] Optionally, the second bearing bush is provided with an oil collecting hole and an oil collecting cavity communicating with the oil collecting hole, and the opening of the oil collecting hole is opened on the second side surface to collect hot oil.

[0016] Optionally, this application also proposes a thrust bearing, including the bearing assembly as described above.

[0017] In the technical solution of this application embodiment, adjacent bearing bushes are configured with one large and one small bush. The first bearing bush is the large bearing bush, used for sliding friction with the mirror plate to bear axial load. The second bearing bush is the small bearing bush, spaced apart between two adjacent first bearing bushes, and also slides against the mirror plate, mainly to adjust the operating performance of the large bearing bush. Specifically, the second bearing bush has a first side surface and a second side surface. The first side surface is higher than the side of the first bearing bush facing the mirror plate in the axial direction of the thrust bearing and slides against the mirror plate. The second side surface is lower than the first side surface in the axial direction of the thrust bearing, and the second side surface is located upstream of the first side surface in the rotational direction of the mirror plate. The gap between the first side and the mirror plate is smaller than the gap between the first bearing and the mirror plate, which can intercept the hot oil film of the first bearing, so as to prevent the hot oil of the upstream bearing from entering the downstream bearing; and a small amount of oil film is between the second bearing and the mirror plate (the first side and the mirror plate), while most of the intercepted hot oil enters between the second bearing and the mirror plate (the second side and the mirror plate), reducing the wear of the second bearing, so that the second bearing can efficiently intercept hot oil, thereby regulating the temperature of the first bearing and improving the temperature uniformity between the first bearings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the layout structure of the bearing assembly provided in the embodiments of this application;

[0020] Figure 2 yes Figure 1 Schematic diagram of the C-section;

[0021] Figure 3 yes Figure 2 Detailed structural diagram of the second bearing bush.

[0022] List of reference numerals

[0023] 1 mirror plate 7 bearing housing 2 The first bearing in the upstream section 8 Small oil film 3 Oil film on the main bearing 9 Protrusion 4 Second bearing 10 Second support component 5 Downstream first bearing 11 positioning rod 6 First support component Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0027] In related technologies, an oil baffle is installed between thrust bearing bushes to prevent hot oil from the upper oil bearing bush from entering the lower oil bearing bush. Research on the application of this structure has shown that it has a good oil-blocking effect in the early stages of operation; however, in the later stages of operation, the temperature between the bearing bushes becomes inconsistent. Therefore, this application proposes a novel structure to solve this technical problem.

[0028] Combination Figure 1 and Figure 2 As shown, this application proposes a bearing assembly for a thrust bearing, the thrust bearing including a mirror plate 1, and the bearing assembly including:

[0029] Multiple first bearing bushes 2 and 5 are disposed facing the mirror plate 1, spaced apart along the circumferential direction of the thrust bearing, and slide and rub against the mirror plate 1;

[0030] A plurality of second bearing bushes 4 are disposed facing the mirror plate 1, and each second bearing bush 4 is disposed between two adjacent first bearing bushes 2 and 5; in the axial projection plane perpendicular to the thrust bearing, the projected area of ​​the second bearing bush 4 is smaller than the projected area of ​​the first bearing bushes 2 and 5.

[0031] The second bearing 4 has a first side and a second side facing the mirror plate 1. The first side is higher than the side of the first bearing 2 and 5 facing the mirror plate 1 in the axial direction of the thrust bearing and slides and rubs against the mirror plate 1. The second side is lower than the first side in the axial direction of the thrust bearing and is located upstream of the first side in the rotation direction of the mirror plate 1.

[0032] In the technical solution of this application embodiment, adjacent bearing bushes are configured with one large and one small bush. The first bearing bushes 2 and 5 are large bearing bushes, used for sliding friction with the mirror plate 1 to bear axial loads. The second bearing bush 4 is a small bearing bush, spaced between adjacent first bearing bushes 2 and 5, and slides against the mirror plate 1, mainly to adjust the operating performance of the large bearing bushes. Specifically, the second bearing bush 4 has a first side and a second side. The first side is higher than the side of the first bearing bushes 2 and 5 facing the mirror plate 1 in the axial direction of the thrust bearing and slides against the mirror plate 1. The second side is lower than the first side in the axial direction of the thrust bearing and is located upstream of the first side in the rotation direction of the mirror plate 1. The gap between the first side and the mirror plate 1 is smaller than the gap between the first bearings 2 and 5 and the mirror plate 1, so as to intercept the hot oil film of the first bearings 2 and 5, thus preventing the hot oil of the upstream bearing from entering the downstream bearing; a small amount of oil film is formed between the second bearing 4 and the mirror plate 1 (the first side and the mirror plate 1), while most of the intercepted hot oil enters between the second bearing 4 and the mirror plate 1 (the second side and the mirror plate 1), so that there is enough lubricating oil between the second bearing 4 and the mirror plate 1 to reduce the wear of the second bearing 4, so that the second bearing 4 can efficiently intercept hot oil, thereby regulating the temperature of the first bearings 2 and 5, and improving the temperature uniformity between the first bearings 2 and 5.

[0033] The oil film between the first bearing 2 and the mirror plate 1 is the large bearing oil film 3, and the oil film between the second bearing 4 and the mirror plate 1 is the small bearing oil film 8.

[0034] As an optional implementation of the above embodiments, the first side and the second side are arranged in parallel. In this embodiment, the first side and the second side are spaced apart axially, so that a hot oil storage space is formed in the upstream region of the second bearing 4, so that hot oil enters the hot oil storage space after being intercepted by the second bearing 4, thereby ensuring sufficient lubricating oil between the second bearing 4 and the mirror plate 1.

[0035] As an optional implementation of the above embodiments, the first side is parallel to the mirror plate 1, and the second side is inclined to the mirror plate 1. That is, there is still a gap between the second side and the mirror plate 1 to facilitate the temporary storage of hot oil; the inclined arrangement of the second side allows the intercepted hot oil to flow along the second side, facilitating the flow of hot oil into the oil tank.

[0036] As an optional implementation of the above embodiments, the first side surface is a plane, and the second side surface is a curved surface. In this embodiment, the first side surface has mutual friction with the mirror plate 1, and is therefore set as a plane. The second side surface is set as a curved structure, such as a parabola or an arc surface, so that a transition surface is formed in the upstream area of ​​the second bearing 4, which facilitates the flow of hot oil.

[0037] In specific implementation, such as Figure 3 As shown, the second bearing 4 includes a body portion and a protrusion 9. The protrusion 9 protrudes from the body portion to intercept hot oil. The body portion has a second side surface located upstream of the protrusion 9 in the rotational direction, and the protrusion 9 has a first side surface.

[0038] Depending on the operating conditions of the thrust bearing, the technical solutions of the above embodiments are selected and applied to different operating environments, which will not be elaborated further here.

[0039] As an optional embodiment of the above embodiments, a hot oil outlet is defined between the first bearing bushes 2 and 5 and the mirror plate 1, and the second side surface is lower than the hot oil outlet in the axial direction of the thrust bearing. A hydrodynamic oil film exists between the mirror plate 1 and the first bearing bushes 2 and 5. Under the friction between the mirror plate 1 and the first bearing bushes 2 and 5, the temperature of the hydrodynamic oil film increases, and the mirror plate 1 carries a portion of the hot oil out of the hot oil outlet. By setting the second side surface lower than the hot oil outlet in the axial direction of the thrust bearing, sufficient lubricating oil is provided between the second bearing bush 4 and the mirror plate 1 to reduce wear between them.

[0040] As an optional embodiment of the above embodiments, the second bearing 4 has a first circumferential gap with the first bearings 2 and 5 located upstream in the rotational direction; the second bearing 4 has a second circumferential gap with the first bearings 2 and 5 located downstream in the rotational direction. A second bearing 4 is provided between two adjacent first bearings 2 and 5. For this structural unit, the first bearing 2 and 5 located upstream have a first circumferential gap with the second bearing 4, and the first bearing 2 and 5 located downstream have a second circumferential gap with the second bearing 4. Since the second bearing 4 has the function of intercepting hot oil, the intercepted hot oil enters the oil trough through the first circumferential gap; while the second circumferential gap is located downstream of the second bearing 4. Since the hot oil does not pass through the second bearing 4, there is cold oil in the second circumferential gap. Under the rotation of the mirror plate 1, the cold oil re-adheres to the mirror plate 1.

[0041] As an optional embodiment of the above embodiments, the bearing assembly includes: a plurality of first support members 6, each of which is correspondingly connected to a first bearing 2, 5; a plurality of second support members 10, each of which is correspondingly connected to a second bearing 4; wherein, the first support members 6 are rigid or elastic support members; and the second support members 10 are elastic support members. In the technical solution of this application embodiment, in order to ensure the oil-blocking effect and stability of the second bearing 4, the second support member 10 is set as an elastic support member, so that the second bearing 4 can adapt to axial dynamic loads during operation, so that the second bearing 4 can be in close contact with the mirror plate 1, ensuring the oil-blocking effect.

[0042] In this embodiment, the first support member 6 of the first bearing shells 2 and 5 can be a rigid support member or an elastic support member. The first support member 6 of the first bearing shells 2 and 5 is specifically configured according to the specific working conditions of the thrust bearing, and will not be explained in detail here.

[0043] As an optional embodiment of the above embodiments, the second support member 10 includes a positioning rod 11 and a spring. The second bearing shell 4 is slidably engaged with the positioning rod 11 on the corresponding second support member 10, and the second bearing shell 4 is fixedly connected to the spring on the corresponding second support member 10. In this embodiment, the positioning rod 11 is slidably engaged with the second bearing shell 4. The spring is arranged around the positioning rod 11. The positioning rod 11 and the spring are generally fixed on the housing of the oil tank of the thrust bearing or on the bearing seat 7 of the thrust bearing. When the rotating shaft drives the mirror plate 1 to rotate, the second bearing shell 4 presses against the working surface of the mirror plate 1 under the action of the spring, so that the upper part of the second bearing shell 4 is in close contact with the working surface of the mirror plate 1 under the action of the spring, thereby reducing the hot oil in the upstream first bearing shells 2 and 5 carried by the mirror plate 1 into the downstream second bearing shell 4.

[0044] As an optional embodiment of the above embodiments, the second bearing bush 4 is provided with an oil collecting hole and an oil collecting cavity communicating with the oil collecting hole. The opening of the oil collecting hole is located on the second side surface to collect hot oil. In some embodiments, by providing an oil collecting hole and an oil collecting cavity on the second bearing bush 4, a portion of the hot oil can be collected by the second bearing bush 4. Generally, the collected hot oil is cooled by an external cooler and then returned to the lubricating oil environment where the thrust bearing is located to regulate the oil temperature in the oil sump, thereby circulating and cooling the bearing and maintaining the oil temperature in the oil sump within an appropriate range. Typically, the second bearing bush 4 is also provided with an oil outlet communicating with the oil collecting cavity, and the oil outlet is connected to the external cooler through an oil supply pipe. The external cooler returns the cooled oil to the oil sump through the oil supply pipe to achieve the purpose of circulating cooling.

[0045] As an optional implementation of the above embodiments, this application also proposes a thrust bearing, including a bearing assembly. This bearing assembly employs some or all of the technical solutions in the foregoing embodiments, and therefore possesses some or all of the technical advantages of the foregoing embodiments, which will not be elaborated upon here.

[0046] The foregoing has provided a detailed description of a bearing assembly and thrust bearing provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A bearing assembly for a thrust bearing, the thrust bearing comprising a mirror plate, characterized in that, A plurality of first bearing bushes are disposed facing the mirror plate, spaced apart circumferentially along the thrust bearing, and slide and rub against the mirror plate; A plurality of second bearing bushes are disposed facing the mirror plate, and each second bearing bush is disposed between two adjacent first bearing bushes; in the axial projection plane perpendicular to the thrust bearing, the projected area of ​​the second bearing bush is smaller than the projected area of ​​the first bearing bush. The second bearing bush has a first side and a second side facing the mirror plate. The first side is higher than the side of the first bearing bush facing the mirror plate in the axial direction of the thrust bearing and slides and rubs against the mirror plate. The second side is lower than the first side in the axial direction of the thrust bearing and is located upstream of the first side in the rotation direction of the mirror plate. The bearing assembly includes: a plurality of first support members, each of which is correspondingly connected to a first bearing; a plurality of second support members, each of which is correspondingly connected to a second bearing; wherein, the first support members are rigid or elastic support members; and the second support members are elastic support members; The second support member includes a positioning rod and a spring. The second bearing bush is slidably engaged with the positioning rod on the corresponding second support member, and the second bearing bush is fixedly connected to the spring on the corresponding second support member.

2. The bearing assembly as described in claim 1, characterized in that, The first side and the second side are arranged in parallel.

3. The bearing assembly as described in claim 1, characterized in that, The first side and the second side are inclined to each other.

4. The bearing assembly as described in claim 1, characterized in that, The first side is a plane, and the second side is a curved surface.

5. The bearing assembly as claimed in claim 1, characterized in that, A hot oil outlet is defined between the first bearing bush and the mirror plate, and the second side is axially lower than the hot oil outlet of the thrust bearing.

6. The bearing assembly as claimed in claim 1, characterized in that, The second bearing bush has a first circumferential clearance with the first bearing bush located upstream of it in the rotational direction; The second bearing bush has a second circumferential gap with the first bearing bush located downstream of it in the rotational direction.

7. The bearing assembly as claimed in claim 1, characterized in that, The second bearing has an oil collecting hole and an oil collecting cavity communicating with the oil collecting hole. The opening of the oil collecting hole is located on the second side to collect hot oil.

8. A thrust bearing, characterized in that, Includes the bearing assembly according to any one of claims 1 to 7.

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