Self-adaptive radial-thrust integrated combined bearing suitable for high-speed heavy-load working conditions

Abstract

The utility model provides a self-adaptive radial-thrust integrated combined bearing suitable for high-speed heavy-load working conditions, which comprises a bearing body, a thrust fixed pad and a radial tilting pad, and the bearing body comprises a radial part and a thrust part; the thrust fixed pad is fixedly installed at one end of the thrust part in the circumferential direction, and the radial tilting pad is arranged in the radial part in the circumferential direction. A cavity structure is arranged on the side, used for forming a friction pair, of the thrust fixing pad and used for forming an oil film, the radial tilting pad comprises a bearing radial tilting pad and a non-bearing radial tilting pad, and microtextures are distributed on the bearing radial tilting pad. Microtextures are arranged at the bearing positions of the radial part pads, the contact area between friction pairs is effectively reduced, so that contact deformation and local pressure concentration are reduced, the friction coefficient is further reduced, the thrust part pads are provided with cavity structures, the temperature of lubricating oil between the friction pairs is greatly reduced, fluid viscosity is guaranteed, and the service life of the thrust part pads is prolonged. And the axial bearing capacity and the unbalance loading resistance of the bearing are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing technology, specifically to an adaptive radial thrust integrated bearing suitable for high-speed heavy-load conditions. Background Technology

[0002] Compared to rolling bearings, sliding bearings have significant advantages in terms of operating noise, rotational accuracy, load-bearing capacity, manufacturing cost, and adaptability. Current research on sliding bearings mainly focuses on fixed-pad sliding bearings, elliptical sliding bearings, water-lubricated sliding bearings, tilting pad radial sliding bearings, fixed-pad thrust bearings, and gas thrust bearings. With the increasing demand for higher speeds in rotating machinery, rotor systems need to operate at or around critical speeds, making rotor vibration control increasingly urgent. In ship propulsion systems, the weight of the stern propeller causes bending of the propulsion shaft, inevitably subjecting the bearings to off-center loading. This can easily lead to contact between the journal and the bearing shell, resulting in dry friction and bearing shell damage, causing losses.

[0003] In the past decade, high-power, high-speed, heavy-duty rotating machinery has developed rapidly. As the core component of rotating machinery, the support structure needs to meet more demanding operating conditions. The shortcomings of existing technologies are: radial sliding bearings and thrust bearings can only withstand loads in one direction; under high-speed and heavy-duty conditions, the temperature of the sliding oil rises rapidly and the viscosity drops rapidly, leading to dry friction and bearing damage, resulting in poor stability; under heavy-duty conditions, the oil supply system cannot guarantee the formation of a stable oil film on each friction pair of the bearing; existing radial-thrust integrated bearings are sensitive to eccentric load conditions and do not have good anti-eccentric load capabilities. Utility Model Content

[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide an adaptive radial thrust integrated bearing suitable for high-speed and heavy-load conditions.

[0005] According to the present invention, an adaptive radial-thrust integrated bearing suitable for high-speed heavy-load conditions is provided, comprising a bearing body, a thrust fixed pad, and a radially tiltable pad, wherein the bearing body comprises a radial portion and a thrust portion;

[0006] The thrust fixing tile is fixedly installed circumferentially at one end of the thrust portion, and the radially tiltable tile is arranged circumferentially inside the radial portion;

[0007] The thrust-fixing pad has a cavity structure on one side for forming a friction pair to form an oil film. The radially tiltable pad includes a bearing radially tiltable pad and a non-bearing radially tiltable pad. The bearing radially tiltable pad has microtextures distributed on it.

[0008] Preferably, the bearing radially tiltable pad is located in the direction of the load on the radial portion of the bearing, and the non-bearing radially tiltable pad is located in the opposite direction of the load on the radial portion of the bearing.

[0009] The inner surface of the unsupported radially tiltable tile is a smooth curved surface.

[0010] Preferably, the cavity structure of the thrust fixing tile includes a stepped type, a ramp type, a stepped pocket type, or a ramp pocket type;

[0011] The bottom surface of the cavity structure is recessed relative to the friction surface of the thrust fixing tile, and oil enters the friction pair from the side opening of the cavity structure to form an oil film.

[0012] Preferably, the microtexture on the radially tiltable tile includes cylindrical recesses, hemispherical recesses, conical recesses, or prismatic recesses.

[0013] Preferably, the distribution of the microtexture on the radially tiltable tile includes uniform array distribution, axial non-uniform array distribution, circumferential non-uniform array arrangement, and ring arrangement.

[0014] In the axially non-uniform array distribution, multiple microtextures form multiple rows along the axial direction, and the multiple rows of microtextures are non-uniformly distributed on the inner side of the radially tiltable tile bearing the load.

[0015] In the circumferential non-uniform array arrangement, multiple microtextures form multiple columns along the circumference, and the multiple columns of microtextures are non-uniformly distributed on the inner side of the radially tiltable tile.

[0016] Preferably, the radially tiltable tile is movably disposed within the radial portion in the circumferential direction;

[0017] An oil spraying screw is provided at the gap between adjacent radially tiltable tiles. The oil spraying screw is fixedly installed on the inner side of the radial portion and is used to limit the radially tiltable tiles.

[0018] Preferably, the thrust fixing blocks are evenly arranged circumferentially, and a limit screw is provided at the gap between adjacent thrust fixing blocks, and the limit screw is fixedly installed at one end of the thrust part.

[0019] Preferably, the radial portion is provided with an oil inlet channel corresponding to the injector screw along the circumferential direction, and the injector screw is disposed in the oil inlet channel.

[0020] Preferably, the side of the thrust section is provided with an oil supply groove.

[0021] Preferably, the radial portion and the thrust portion are coaxially assembled via a fastener.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The radial bearing pads of this invention have a micro-textured structure at the load-bearing point, which can effectively reduce the contact area between the friction pairs, thereby reducing contact deformation and local pressure concentration, and thus reducing the friction coefficient. The thrust bearing pads have a cavity structure, which can greatly reduce the lubricating oil temperature between the friction pairs, ensure fluid viscosity, and greatly improve the axial load capacity and anti-eccentric load performance of the bearing. Attached Figure Description

[0024] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram showing the installation position of the radially tiltable tile in this utility model;

[0027] Figure 3 This is a schematic diagram showing the installation positions of the thrust fixing block and the limiting screw in this utility model;

[0028] Figure 4 This is a structural schematic diagram of the present invention from a side view angle;

[0029] Figure 5 for Figure 4 A cross-sectional view at angle 1-1;

[0030] Figure 6 This is a schematic diagram of the microtexture structure on the radially tiltable tile in this utility model;

[0031] Figure 7 This is a schematic diagram of the thrust-fixed tile cavity structure in this utility model;

[0032] Figure 8 This is a schematic diagram showing the distribution of the radially tiltable tile microtexture on the radially tiltable tile in this utility model.

[0033] The diagram shows:

[0034] Thrust fixing block 1, limit screw 4

[0035] First thrust fixing tile 11 First limiting screw 41

[0036] Second thrust fixing tile 12 Second limit screw 42

[0037] Third thrust fixing tile 13 Third limit screw 43

[0038] Fourth thrust fixing block 14; Fourth limit screw 44

[0039] Fifth thrust fixing block 15; Fifth limit screw 45

[0040] Sixth thrust fixing block 16; Sixth limit screw 46

[0041] Seventh thrust fixing block 17; Seventh limit screw 47

[0042] Eighth thrust fixing block 18; Eighth limit screw 48

[0043] 2 unloaded radially tiltable pads and 5 oil injection screws

[0044] First unloaded radially tiltable pad 21 First oil injection screw 51

[0045] Second unloaded radially tiltable pad 22 Second oil injection screw 52

[0046] Third unloaded radially tiltable pad 23; Third oil injection screw 53

[0047] Bearing radially tiltable pad 3, fourth oil injection screw 54

[0048] First bearing radial tilting pad 31; Fifth oil injection screw 55

[0049] Second load-bearing radially tiltable pad 32 bearing body 6

[0050] Third load-bearing radially tiltable tile 33, fastener 7 Detailed Implementation

[0051] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0052] This utility model discloses an adaptive radial-thrust integrated bearing suitable for high-speed heavy-load conditions. The radial portion of the bearing pads is provided with micro-texture, which can effectively reduce the contact area between the friction pairs, thereby reducing contact deformation and local pressure concentration, and thus reducing the friction coefficient. The thrust portion of the bearing pads is provided with a cavity structure, which can greatly reduce the lubricating oil temperature between the friction pairs, ensure fluid viscosity, and greatly improve the axial load capacity and anti-eccentric load performance of the bearing.

[0053] According to the adaptive radial thrust integrated bearing suitable for high-speed heavy-load conditions provided by this utility model, such as Figure 1-8As shown, the bearing includes a bearing body 6, a thrust fixing pad 1, a non-loaded radially tilting pad 2, a load-bearing radially tilting pad 3, a limiting screw 4, and an oil injection screw 5. The bearing body 6 consists of two parts connected by screws during installation, which can greatly reduce the difficulty of bearing manufacturing and installation. The thrust fixing pad 1 is fixedly installed circumferentially at one end of the thrust part, and the radially tilting pad is arranged circumferentially inside the radial part. This design can be used in harsh conditions of high speed and heavy load.

[0054] In a preferred embodiment, a layer of bearing alloy SnSb8Cu4 is provided on the thrust fixed bearing 1, the unloaded radially tiltable bearing 2, and the load-bearing radially tiltable bearing 3. This design can improve the friction reduction and wear resistance of the bearing, and its good thermal conductivity and corrosion resistance can prevent the bearing from accumulating a large amount of heat and corrosion caused by friction, thereby extending its service life.

[0055] The bearing radially tiltable pad 3 is machined with a microtexture. This design reduces the contact area between friction pairs during bearing operation, thereby reducing contact deformation and local pressure concentration, and ultimately lowering the coefficient of friction. Preferably, the distribution of the microtexture on the bearing radially tiltable pad 3 can be adjusted accordingly, such as... Figure 8 As shown, the microtexture distribution density can be increased in areas with high bearing pressure distribution, and the microtexture distribution pattern can be changed according to the rotational speed and load conditions. This design allows for the rational selection of microtexture distribution based on operating conditions, reducing processing difficulty without compromising bearing performance.

[0056] An oil injection screw 5 is provided between adjacent radially tilting pads. On the one hand, it can smoothly deliver lubricating oil into the internal groove of the bearing, and then form an oil film between the journal and the radially tilting pad through the rotation of the journal. On the other hand, it can restrict the movement of the radially tilting pads in the bearing, so that the radially tilting pads can always be in the designed position.

[0057] The thrust fixing pad 1 is machined with a cavity structure. In actual use, the cavity structure can greatly reduce the lubricating oil temperature between the friction pairs, ensure fluid viscosity, and greatly improve the axial load capacity of the bearing. The presence of the cavity allows the lubricating oil to enter the friction pairs more smoothly when the shaft system is under eccentric load, enhancing the bearing's anti-eccentric load performance. The cavity can form a friction pair with a larger thickness with the journal, generating oil film force to support the journal. The cavity can generate hydrostatic pressure through the oil supply system, providing support when the rotor system starts up.

[0058] Limiting screws 4 are provided between adjacent thrust fixing pads 1. This design can effectively limit the movement of the thrust fixing pads 1, so that the thrust fixing pads 1 are always in the designed position during operation. In addition, oil is sprayed between the thrust fixing pads 1 through the limiting screws 4, so that the lubricating oil can enter the friction pair more smoothly, greatly improving the axial load capacity and stability of the bearing.

[0059] The radial bearing pads are designed as tilting pads with strip-shaped protrusions on their backs. This allows the pads to swing freely under load, enabling lubricating oil in the grooves to smoothly enter the friction pair and form a stable oil film, thus improving the bearing's load-bearing capacity and stability. In actual use, the radial tilting pads swing freely with varying speeds, loads, and bearing temperatures, forming multiple converging wedges around the journal. The oil film force formed by each converging wedge passes through the bearing center, and the resultant oil film force is equal in magnitude and opposite in direction to the external load. Therefore, this significantly improves the bearing's stability and radial load-bearing capacity.

[0060] Example 1

[0061] This embodiment provides a novel adaptive radial-thrust integrated combined bearing, comprising a thrust fixing pad 1 with a cavity structure, a non-load-bearing radial tilting pad 2 without microtexture, a load-bearing radial tilting pad 3 with microtexture, a limiting screw 4, an oil injection screw 5, a bearing body 6, and fasteners 7 such as screws. The bearing body 6 consists of a radial portion and a thrust portion, allowing the bearing body 6 to simultaneously mount the thrust fixing pad 1 and the radial tilting pad, and simultaneously bear the radial and axial loads of the rotor system. The bearing body 6 is assembled using fasteners 7 such as screws.

[0062] like Figure 7 As shown, the cavity structure of the thrust fixing pad 1 can be configured as four types: stepped, ramp, stepped-pocket, and ramp-pocket. This design allows lubricating oil to smoothly enter the friction pair from the groove between the pads to form a stable oil film, improving the bearing's load-bearing capacity and operational stability; it also reduces the lubricating oil temperature and maintains the lubricating oil viscosity under high-speed and heavy-load conditions, preventing a sudden drop in load-bearing capacity and dry friction; different cavity structures can adapt to different working conditions, and the design can be combined with the processing technology for comprehensive consideration and reasonable selection.

[0063] like Figure 2 As shown, the unloaded radially tiltable pad 2 without microtexture is located in the opposite position of the radial part of the bearing bearing the load. It is mainly used to maintain the stability of the journal during operation. No microtexture is set to reduce the processing difficulty. They are the first unloaded radially tiltable pad 21, the second unloaded radially tiltable pad 22, and the third unloaded radially tiltable pad 23, located in the upper semicircle along the circumference.

[0064] The bearing radially tiltable pad 3 with microtexture is located in the load-bearing direction of the radial part of the bearing. By setting the microtexture, the continuity of oil film pressure can be broken, and its local pressure concentration can be reduced; the contact area can be reduced, thereby reducing friction loss. The first bearing radially tiltable pad 31 and the second bearing radially tiltable pad 32 are located in the lower semicircle along the circumference.

[0065] like Figure 6 As shown, this embodiment provides four microtexture shape options: cylindrical, hemispherical, conical, and prismatic. These four microtextures are suitable for different rotational speeds and radial load conditions. The arrangement and density of the microtextures on the radially tiltable load-bearing tile 3 containing the microtextures can be adjusted in different ways, such as... Figure 8 As shown, there are four types of microtexture distributions: uniform array distribution, axial non-uniform array distribution, circumferential non-uniform array arrangement, and ring arrangement. During processing, the appropriate microtexture distribution can be flexibly selected according to the working conditions.

[0066] The unloaded radially tilting pad 2 and the loaded radially tilting pad 3 will swing after being subjected to force, so that the oil film force of each pad passes through the center of the journal. The resultant force of the oil film generated by all pads is equal in magnitude and opposite in direction to the external load, which has extremely strong stability. Moreover, its swing amplitude can change in real time with the change of working conditions, which has good self-adaptive ability.

[0067] The limiting screw 4 is located in the gap of the thrust bearing 1. An oil supply groove is provided on the side of the thrust section. The limiting screw 4 can supply oil while restricting the movement of the thrust bearing, ensuring that the thrust bearing is always in the designed position and receives a good oil supply environment. Figure 3 As shown, the thrust fixing tile 1 includes a first thrust fixing tile 11, a second thrust fixing tile 12, a third thrust fixing tile 13, a fourth thrust fixing tile 14, a fifth thrust fixing tile 15, a sixth thrust fixing tile 16, a seventh thrust fixing tile 17, and an eighth thrust fixing tile 18 distributed circumferentially. The limiting screw 4 is disposed between adjacent thrust fixing tiles 1 and includes a first limiting screw 41, a second limiting screw 42, a third limiting screw 43, a fourth limiting screw 44, a fifth limiting screw 45, a sixth limiting screw 46, a seventh limiting screw 47, and an eighth limiting screw 48 in sequence.

[0068] like Figure 5 As shown, the oil injection screw 5 is located in the gap between the radially tilting pads and includes, in sequence, a first oil injection screw 51, a second oil injection screw 52, ​​a third oil injection screw 53, a fourth oil injection screw 54, and a fifth oil injection screw 55. It can supply oil while restricting the movement of the radial pads, ensuring that the radial pads are always in the designed position and have a good oil supply environment. Oil inlet channels corresponding to the oil injection screws 5 are distributed circumferentially along the radial portion.

[0069] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0070] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An adaptive radial thrust integrated bearing suitable for high-speed, heavy-load conditions, characterized in that, It includes a bearing body (6), a thrust fixing pad (1), and a radially tiltable pad, wherein the bearing body (6) includes a radial portion and a thrust portion; The thrust fixing tile (1) is fixedly installed circumferentially at one end of the thrust part, and the radially tiltable tile is arranged circumferentially inside the radial part; The thrust fixing pad (1) has a cavity structure on one side for forming a friction pair to form an oil film. The radially tiltable pad includes a bearing radially tiltable pad (3) and a non-bearing radially tiltable pad (2). The bearing radially tiltable pad (3) has microtexture distributed on it.

2. The adaptive radial thrust integrated bearing suitable for high-speed, heavy-load conditions according to claim 1, characterized in that, The bearing radial tilting pad (3) is located in the direction of the load on the radial part of the bearing, and the non-bearing radial tilting pad (2) is located in the opposite direction of the load on the radial part of the bearing. The inner surface of the unsupported radially tiltable tile (2) is a smooth curved surface.

3. The adaptive radial thrust integrated bearing suitable for high-speed, heavy-load conditions according to claim 1, characterized in that, The cavity structure of the thrust fixing tile (1) includes a stepped type, a ramp type, a stepped pocket type, or a ramp pocket type; The bottom surface of the cavity structure is recessed relative to the friction surface of the thrust fixing tile (1), and oil enters the friction pair from the side opening of the cavity structure to form an oil film.

4. The adaptive radial thrust integrated bearing suitable for high-speed, heavy-load conditions according to claim 1, characterized in that, The microtexture on the radially tiltable tile (3) includes cylindrical recesses, hemispherical recesses, conical recesses, or prismatic recesses.

5. The adaptive radial thrust integrated bearing suitable for high-speed, heavy-load conditions according to claim 1, characterized in that, The distribution of microtextures on the radially tiltable tile (3) includes uniform array distribution, axial non-uniform array distribution, circumferential non-uniform array arrangement and ring arrangement. In the axially non-uniform array distribution, multiple microtextures form multiple rows along the axial direction, and the multiple rows of microtextures are non-uniformly distributed on the inner side of the radially tiltable tile (3); In the circumferential non-uniform array arrangement, multiple microtextures form multiple columns along the circumferential direction, and the multiple columns of microtextures are non-uniformly distributed on the inner side of the radially tiltable tile (3).

6. The adaptive radial thrust integrated bearing suitable for high-speed, heavy-load conditions according to claim 1, characterized in that, The radially tiltable tile is movably disposed inside the radial portion along the circumference; An oil spraying screw (5) is provided at the gap between adjacent radially tiltable tiles. The oil spraying screw (5) is fixedly installed on the inner side of the radial portion and is used to limit the radially tiltable tiles.

7. The adaptive radial thrust integrated bearing suitable for high-speed, heavy-load conditions according to claim 1, characterized in that, The thrust fixing blocks (1) are evenly arranged circumferentially, and limit screws (4) are provided in the gap between adjacent thrust fixing blocks (1). The limit screws (4) are fixedly installed at one end of the thrust part.

8. The adaptive radial thrust integrated bearing suitable for high-speed, heavy-load conditions according to claim 6, characterized in that, The radial portion is provided with an oil inlet channel corresponding to the oil injector screw (5) along the circumferential direction, and the oil injector screw (5) is disposed in the oil inlet channel.

9. The adaptive radial thrust integrated bearing suitable for high-speed, heavy-load conditions according to claim 7, characterized in that, The thrust section is provided with an oil supply groove on its side.

10. The adaptive radial thrust integrated bearing suitable for high-speed, heavy-load conditions according to claim 1, characterized in that, The radial portion and the thrust portion are coaxially assembled by a fastener (7).

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