Self-balancing tilting pad bearing

Abstract

The invention discloses a self-balancing tilting pad bearing, and relates to the technical field of sliding bearings. The bearing specifically comprises a bearing shell upper half part, a bearing shell lower half part, a plurality of oil nozzles, a plurality of tilting pads and a bearing end cover, the bearing shell upper half part and the bearing shell lower half part form an annular bearing shell, the tilting pads are arranged on the inner side of the annular bearing shell and are distributed at equal intervals in the circumferential direction, and the oil nozzles are located between the adjacent tilting pads. The bearing end covers are fixedly installed on the two axial sides of the annular bearing shell. The lower half part of the bearing shell is provided with the balance bridge mechanism, the balance bridge mechanism enables the two tilting pads at the bottom of the tilting pad bearing to achieve displacement changes in the radial direction along with swinging of the balance bridge mechanism, then adjustment of the preload coefficients of the tilting pads is achieved, and the effect of self-balancing of the loads of the pads is achieved. The tilting-pad bearing solves the problem of uneven bearing of the bearing pad in the tilting-pad bearing, avoids the investment of a large amount of manpower and material resources in the existing technical scheme, and has remarkable economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of sliding bearings, and in particular to a self-balancing tilting pad bearing. Background Art

[0002] The tilting pad bearing is a high-performance sliding bearing. Due to its superior stability, it is widely used in high-speed, heavy-load and high-precision rotating machinery. For example, the tilting pad bearing can be used for heavy-duty gas turbine rotor support. In actual applications, the bearing pads at the bottom of the tilting pad bearing often have uneven bearing temperatures. At the highest point, the temperature difference between the bearing pads can reach more than 40°C, which causes the temperature of the pads on one side to be low, while the pads on the other side may be overheated, seriously threatening the safe operation of the equipment. The above phenomenon is mainly caused by some deviations in the manufacturing and installation process or the deflection of the rotor during operation, which causes uneven bearing of the bottom pads.

[0003] In view of the above problems, the existing technical solution is to adjust the load distribution of the pad by adjusting the preload coefficient of the pad. The specific implementation means is to disassemble the bearing box after the equipment is shut down, turn out and disassemble the bearing, and adjust the pad preload by adjusting the gasket on the back of the pad, thereby achieving the purpose of uniform load bearing of the bearing pad. The main problems of the existing technical solution are:

[0004] (1) The existing technical solution requires stopping the machine to disassemble the bearing box and disassemble the bearing before implementation, which is labor-intensive, has a long working cycle, and requires a large investment in manpower and material resources. The equipment shutdown will also cause large economic losses. In particular, for some gas turbines or gas turbine scale test pieces, the bearing box cannot be opened separately without opening the cylinder. In this case, the upper half of the cylinder needs to be lifted before the bearing box can be opened, which further increases the difficulty of on-site construction.

[0005] (2) The existing technical solution mainly involves increasing or decreasing the gaskets on the back of the tile. Since the increase or decrease of the gasket thickness is discontinuous, the change of the tile preload coefficient is also discontinuous. In addition, the deviation of the estimated adjustment amount may cause the operating effect after adjustment to be unclear or over-adjusted, which may require a second shutdown adjustment.

[0006] The existing patent CN112211903A discloses a load-balancing sliding bearing, which includes a bearing body, a supporting pad and a load-balancing adjustment mechanism. The rotating load-balancing block is arranged inside the bearing body and contacts and cooperates with the bearing body. The movable load-balancing block is arranged corresponding to each supporting pad and contacts and cooperates with the supporting pad. The movable load-balancing block is transmission-connected with the bearing body and the rotating load-balancing block, so that the sliding of the movable load-balancing block along the radial direction of the bearing can be converted into the circumferential rotation of the rotating load-balancing block. Then, during the operation of the supported sliding bearing, each supporting pad is linked together through the load-balancing adjustment mechanism, and the gap between each supporting pad and the shaft neck is adaptively adjusted, so as to realize the load distribution between each supporting pad and achieve the characteristic of balanced force between each supporting pad.

[0007] The existing patent CN114233745A discloses a dual-thrust self-balancing load-balancing structural bearing for high-speed rotors, including a feedback assembly, a front balancing block, a front thrust pad, a bearing copper alloy, a rotor, a rear balancing block and a rear thrust pad. The inner edge of the front end of the feedback assembly is pressed with the front balancing block, and the outer edge of the rear end is pressed with the rear balancing block. The front balancing block presses the front thrust pad, and the rear balancing block presses the rear thrust pad. The surfaces of the front thrust pad and the rear thrust pad that fit the rotor are plated with a bearing copper alloy. This dual-thrust self-balancing structure avoids the limitation that the current thrust bearing can only bear thrust through a single thrust surface, optimizes the structural dimensions, meets the rotor operation requirements with strict structural dimensions, large loads, and high speeds, and has a wide range of application value.

[0008] In summary, the above existing patents do not solve the problem of uneven bearing temperature caused by uneven bearing of the bottom pad of the tilting pad bearing in the prior art. Summary of the invention

[0009] Based on the above technical problems, the present invention proposes a self-balancing tilting pad bearing to solve the problem of uneven pad temperature caused by uneven bearing of the bottom pad of the tilting pad bearing in the prior art.

[0010] To achieve the above purpose, the present invention proposes a self-balancing tilting pad bearing. The specific technical solution is as follows:

[0011] A self-balancing tilting pad bearing comprises an upper half of a bearing housing and a lower half of a bearing housing constituting an annular bearing housing, tilting pads arranged on the inner side of the annular bearing housing and distributed at equal intervals along the circumferential direction, an oil spray nozzle arranged between adjacent tilting pads, and bearing end faces installed on both axial sides of the annular bearing housing, wherein the oil spray nozzle is used to spray lubricating oil into the tilting pad bearing, the bearing end faces are used to limit the tilting pads, and a balancing bridge mechanism is arranged in the lower half of the bearing housing, and the balancing bridge mechanism is used to adaptively adjust the displacement of two tilting pads at the bottom of the tilting pad bearing in the radial direction.

[0012] Furthermore, a cavity is provided in the lower half of the bearing housing, the balancing bridge mechanism is installed in the cavity, two ends of the balancing bridge mechanism respectively support the two tilting pads at the bottom, and the balancing bridge mechanism can swing circumferentially.

[0013] Furthermore, the lower half of the bearing housing includes an inner ring and an outer ring, and an arc-shaped cavity is formed between the inner ring and the outer ring.

[0014] Furthermore, the balancing bridge mechanism includes a balancing bridge, a balancing bridge pad and a pad pivot. The balancing bridge is a fan-shaped component. The balancing bridge pad is installed in the middle of the outer side of the balancing bridge to support the balancing bridge on the inner side of the outer ring. The pad pivot is installed at both ends of the inner side of the balancing bridge to pass through the inner ring to support the two tilting pads at the bottom.

[0015] Furthermore, the tile pivot is cylindrical, and both ends thereof are spherical.

[0016] Furthermore, the balance bridge mechanism further comprises a sleeve, a tile pivot hole is formed on the inner ring, and the sleeve is installed in the tile pivot hole;

[0017] The outer cylindrical surface of the sleeve is processed with an external thread, and the inner cylindrical surface is processed with a plurality of annular grooves.

[0018] Furthermore, a mounting hole penetrating the balancing bridge and the balancing bridge pad is opened at the center of the balancing bridge, and the balancing bridge is mounted on the fuel injector located directly below through the mounting hole, and there is a gap between the mounting hole and the fuel injector.

[0019] Furthermore, the single-side gap between the mounting hole and the fuel injector is 2-3 mm.

[0020] Furthermore, the radius of curvature of the outer side of the balancing bridge is smaller than the radius of curvature of the inner side of the outer ring, and a gap is formed between the outer sides of both ends of the balancing bridge and the inner side of the outer ring, and the gap is 1.5-2.5 mm.

[0021] Furthermore, the balancing bridge mechanism also includes a balancing bridge limit pin installed on the two axial end surfaces of the balancing bridge, and a balancing bridge limit pin matching hole is opened at the corresponding position of the lower half end wall of the bearing shell, and the other end of the balancing bridge limit pin is installed in the balancing bridge limit pin matching hole, and the single-sided clearance between the balancing bridge limit pin and the balancing bridge limit pin matching hole is 1-1.5mm.

[0022] Furthermore, a pad block is installed in the middle of the back side of the tilting pad, and pad limit pins are installed on both axial end surfaces of the tilting pad. The outer circumferential surface of the pad block is a cylindrical surface, and the cylindrical surface contacts the spherical surface of the upper end of the pad pivot to form a point support.

[0023] Furthermore, a tile limit pin matching hole is opened at the corresponding position of the bearing end cover, the other end of the tile limit pin is installed in the tile limit pin matching hole, and the single-side clearance between the tile limit pin and the tile limit pin matching hole is 1-1.5mm.

[0024] Furthermore, the curvature radius of the back of the tilting pad is smaller than the curvature radius of the inner side of the inner ring.

[0025] Furthermore, arc grooves are provided on the inner side of the inner ring on both sides of the pivot hole of the shoe block, the arc grooves are smoothly transitioned to the inner ring in the circumferential direction, and the arc grooves penetrate the inner ring axially.

[0026] Furthermore, the maximum depth of the arc groove is 1.5-2 mm.

[0027] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0028] 1. The self-balancing tilting pad bearing proposed in the present invention can realize adaptive adjustment of the bearing pads at the bottom of the tilting pad bearing according to changes in working conditions, thereby solving the problem of uneven bearing of the bearing pads, avoiding the large amount of manpower and material resources invested in the existing technical solutions, and having significant economic benefits.

[0029] 2. The self-balancing tilting pad bearing proposed in the present invention realizes linear and precise adjustment of the bearing pads at the bottom of the tilting pad bearing according to changes in working conditions, thus avoiding the problems of pure reliance on experience and large deviations in the prior art solutions.

[0030] 3. The self-balancing tilting pad bearing proposed by the present invention has an arc groove on the inner side of the inner ring of the lower half of the bearing housing. The arc groove ensures a certain gap between the pad and the inner ring, so that the pad has a certain displacement space in both the forward and reverse directions of the radial direction.

[0031] 4. The present invention proposes a self-balancing tilting pad bearing, in which both heads of the pad pivot are spherical, forming point supports between the pad pivot seat hole and the pad spacer, and can convert the arc swing displacement of the balance bridge into the radial translation displacement of the pad pivot, thereby realizing the adaptive adjustment of the bottom bearing pad of the tilting pad bearing according to changes in working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 A schematic diagram of the structure of a self-balancing tilting pad bearing proposed by the present invention;

[0034] Figure 2 A cross-sectional schematic diagram of a self-balancing tilting pad bearing proposed by the present invention;

[0035] Figure 3 A schematic diagram of the partial structure of a self-balancing tilting pad bearing proposed by the present invention;

[0036] Figure 4 A schematic diagram of the partial structure of a self-balancing tilting pad bearing proposed by the present invention;

[0037] Figure 5 A schematic diagram of the partial structure of a self-balancing tilting pad bearing proposed by the present invention;

[0038] Figure 6 A schematic diagram of the partial structure of a self-balancing tilting pad bearing proposed by the present invention.

[0039] Figure markings: 10 - upper half of the bearing housing, 20 - lower half of the bearing housing, 30 - oil nozzle, 40 - tilting pad, 50 - bearing end cover, 21 - inner ring, 22 - outer ring, 23 balance bridge, 24 - balance bridge pad, 25 - pad pivot, 26 - balance bridge limit pin, 27 - sleeve, 41 - pad pad, 42 - pad limit pin. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] The present invention is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention.

[0042] In order to solve the problem of uneven bearing load on the bottom pad of the tilting pad bearing in the prior art, which causes uneven pad temperature, the present invention provides a self-balancing tilting pad bearing.

[0043] To achieve the above object, the present invention provides a self-balancing tilting pad bearing. Figure 1-Figure 6 As shown, a self-balancing tilting pad bearing is specifically exemplified.

[0044] See also Figure 1 As shown, the self-balancing tilting pad bearing comprises an upper bearing housing 10, a lower bearing housing 20, a plurality of oil spray nozzles 30, a plurality of tilting pads 40 and a bearing end cover 50. The upper bearing housing 10 and the lower bearing housing 20 form an annular bearing housing. The tilting pads 40 are arranged on the inner side of the annular bearing housing and are evenly spaced along the circumferential direction. The oil spray nozzles 30 are located between adjacent tilting pads 40. The oil spray nozzles 30 are used to spray lubricating oil between the tilting pads 40 and the journal. Figure 2As shown, the bearing end caps 50 are fixedly mounted on both axial sides of the annular bearing housing. A balancing bridge mechanism is provided in the lower half 20 of the bearing housing, and the two tilting pads 40 at the bottom of the tilting pad bearing can achieve radial displacement changes with the swing of the balancing bridge mechanism, thereby adjusting the preload coefficient of the tilting pads 40.

[0045] As a specific implementation of the tilting pad 40, the number of tilting pads in the tilting pad bearing is generally 3-6. In this embodiment, there are 5 tilting pads 40. Figure 1 As shown, the tilting pads 40 are installed on the inner side of the annular bearing housing at equal intervals along the circumferential direction, specifically at the positions of 0°, 72°, 144°, 216° and 288° on the inner circumference. The tilting pad 40 at 0° is directly above, the two tilting pads 40 at 72° and 288° are symmetrical, and the two tilting pads 40 at 144° and 216° are symmetrical. Figure 3 As shown, a pad pad 41 is installed on the pad back of each tilting pad 40, and the tilting pad 40 is supported on the inner side of the annular bearing housing through the pad pad 41. The outer circumferential surface of the pad pad 41 is a cylindrical surface. Pad stop pins 42 are installed on both axial end surfaces of the tilting pad 40, see Figure 2 As shown, the other end of the pad limit pin 42 is installed in the pad limit pin matching hole on the bearing end face 50, and the single-sided clearance between the pad limit pin 42 and the pad limit pin matching hole is 1-1.5mm, so as to ensure the free swing of the tilting pad 40 while limiting the excessive circumferential displacement of the tilting pad 40.

[0046] Optionally, the curvature radius of the outer circumferential surface of the tilting pad 40 is smaller than the curvature radius of the inner circumferential surface of the annular bearing housing, so as to ensure that there is sufficient swing space between the tilting pad 40 and the annular bearing housing.

[0047] As a specific embodiment of the fuel injection nozzle 30, refer to Figure 1 As shown, the oil injection nozzle 30 is located between two adjacent tilting pads 40. The oil injection nozzle 30 passes through the annular bearing housing. In this embodiment, there are five oil injection nozzles 30, and one of the oil injection nozzles 30 is located just below.

[0048] As a specific embodiment of the bearing housing upper half 10 and the bearing housing lower half 20, refer to Figure 1 As shown, the upper half 10 and the lower half 20 of the bearing housing are both semicircular ring components, and the end faces of the upper half 10 and the lower half 20 of the bearing housing are matched and installed to form an annular bearing housing. The lower half 20 of the tilting pad bearing housing includes an inner ring 21 and an outer ring 22, which are matched with each other through stoppers and fastened by end bolts, and an arc-shaped cavity is formed between the inner ring 21 and the outer ring 22, and a balance bridge mechanism is installed in the arc-shaped cavity. Figure 2As shown, the inner side of the annular bearing housing is an annular boss, and a plurality of mounting holes are provided on both side surfaces of the annular boss for fixing and mounting the bearing end cover 50 .

[0049] See also Figure 4 As shown, the balancing bridge mechanism includes a balancing bridge 23, a balancing bridge pad 24, a pad pivot 25 and a balancing bridge stop pin 26. The balancing bridge 23 is a fan-shaped component. The balancing bridge pad 24 is installed in the middle of the outer side of the balancing bridge 23. The balancing bridge pad 24 supports the balancing bridge mechanism on the outer ring 22. The inner ends of the balancing bridge 23 are processed with pad pivot seat holes. The pad pivot 25 is installed in the pad pivot seat holes. The balancing bridge stop pin 26 is arranged on both axial sides of the balancing bridge 23. A circular hole penetrating the balancing bridge 23 and the balancing bridge pad 24 is opened at the center of the balancing bridge 23. The balancing mechanism is installed in the arc-shaped cavity between the inner ring 21 and the outer ring 22. The fuel injection nozzle 30 just below the bottom passes through the circular hole at the center of the outer balancing bridge 23 and the balancing bridge pad 24. The other ends of the balancing bridge stop pins 26 on both axial sides of the balancing bridge 23 are installed in the corresponding balancing bridge stop pin matching holes on the outer ring 22. The outer curvature radius of the balancing bridge 23 is smaller than the inner curvature radius of the outer ring 22. A gap can be formed between the outer sides of the two ends of the balancing bridge 23 and the inner side of the outer ring 22. The balancing bridge 23 can swing in the circumferential direction around the balancing bridge pad 24. The balancing bridge 23 can be prevented from having excessive displacement in the circumferential direction by the limiting of the balancing bridge limiting pin 26. At the same time, in order not to limit the swing of the balancing bridge 23, there is a certain gap between the fuel injector 30 directly below and the balancing bridge 23 and the balancing bridge pad 24.

[0050] Optionally, the gap between the outer sides of both ends of the balance bridge 23 and the inner side of the outer ring 22 is 1.5-2.5 mm.

[0051] Optionally, the single-side gap between the fuel injector 30 and the balancing bridge 23 and the balancing bridge pad 24 is 2-3 mm.

[0052] See also Figure 1 As shown, one end of the pad pivot 25 contacts the bottom of the pad pivot seat hole, and the other end passes through the inner ring 21 and contacts the pad block 41 on the back of the two tilting pads 40 located at 144° and 216°. Both end portions of the pad pivot 25 are spherical, and the outer circumferential surface of the pad block 41 is a cylindrical surface. Point supports are formed between the pad pivot 25 and the pad block 41 and the pad pivot seat hole, so that the tilting pad 40 can swing freely in all directions. Since the balancing bridge 23 swings in an arc around the balancing bridge pad 24, the pad pivot seat hole also swings in an arc. There is point contact between the pad pivot 25 and the pad pivot seat hole, so that the arc swing displacement of the balancing bridge 23 can be converted into the translational displacement of the pad pivot 25. At the same time, a sleeve 27 is provided at the position where the pad pivot 25 passes through the inner ring 21, see Figure 5As shown, the outer circumferential surface of the sleeve 27 is processed with external threads, which are fastened to the threaded holes of the inner ring 21. The constraint of the sleeve 27 on the shoe pivot 25 further forms displacement in the radial line direction.

[0053] Optionally, the inner circumferential surface of the sleeve 27 is processed with a plurality of annular grooves, which can reduce the contact area and friction, and can also accommodate a small amount of impurities.

[0054] See also Figure 6 As shown, an arc groove is machined on the inner side of the inner ring 21 of the lower half 20 of the bearing housing. The arc groove is within a certain angle range A on both sides of the pad pivot hole. The arc groove smoothly transitions with the inner ring 21 in the circumferential direction and penetrates the inner ring 21 in the axial direction. The arc groove is to ensure a certain gap between the tilting pad 40 and the inner ring 21, so that the tilting pad 40 has a certain displacement space in both the forward and reverse directions of the radial direction.

[0055] Optionally, the angle range of the arc groove is 0.8-1 times the wrap angle of the tile.

[0056] Optionally, the maximum depth of the arc-shaped groove is 1.5-2 mm.

[0057] The above-mentioned self-balancing tilting pad bearing has two bearing pads at the bottom that can achieve radial displacement changes with the swing of the balance bridge, thereby adjusting the pad preload coefficient. During the actual operation of the bearing, due to some problems in the processing, manufacturing and operation processes, the distance between the bottom bearing pad and the rotor center may be greatly different, resulting in uneven pad load. If the left pad is closer to the rotor center during operation, the pad load is larger, while the right pad is farther from the rotor center and has a smaller load, then after the pressure of the left and right pads is transmitted to the balance bridge through the pad pivot, since the pressure of the left pad is larger and the pressure of the right pad is smaller, the balance bridge will swing to the left around the fulcrum, causing the left pad pivot to move downward in the radial direction, thereby causing the left pad fulcrum to also move downward in the radial direction and away from the rotor center, while the right pad changes in the opposite direction until the pressure of the pads on both sides is balanced and the balance bridge reaches a new balance position, achieving the effect of self-balancing the pad load.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0060] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A self-balancing tilting pad bearing, characterized in that: The invention comprises an upper half of a bearing housing and a lower half of a bearing housing which constitute an annular bearing housing, tilting pads which are arranged on the inner side of the annular bearing housing and are evenly spaced along the circumferential direction, oil spray nozzles which are arranged between adjacent tilting pads, and bearing end faces which are installed on both axial sides of the annular bearing housing, wherein the oil spray nozzles are used to spray lubricating oil into the tilting pad bearing, the bearing end faces are used to limit the tilting pads, and a balancing bridge mechanism is arranged in the lower half of the bearing housing, and the balancing bridge mechanism is used to adaptively adjust the displacement of the two tilting pads at the bottom of the tilting pad bearing in the radial direction.

2. The self-balancing tilting pad bearing according to claim 1, characterized in that: A cavity is provided in the lower half of the bearing housing, and the balancing bridge mechanism is installed in the cavity. Two ends of the balancing bridge mechanism respectively support the two tilting pads at the bottom, and the balancing bridge mechanism can swing circumferentially.

3. The self-balancing tilting pad bearing according to claim 2, characterized in that: The lower half of the bearing housing comprises an inner ring and an outer ring, and an arc-shaped cavity is formed between the inner ring and the outer ring.

4. The self-balancing tilting pad bearing according to claim 3, characterized in that: The balancing bridge mechanism includes a balancing bridge, a balancing bridge pad and a pad pivot. The balancing bridge is a fan-shaped component. The balancing bridge pad is installed in the middle of the outer side of the balancing bridge to support the balancing bridge on the inner side of the outer ring. The pad pivot is installed at both ends of the inner side of the balancing bridge to penetrate the inner ring to support the two tilting pads at the bottom.

5. The self-balancing tilting pad bearing according to claim 4, characterized in that: The tile pivot is cylindrical, and both ends thereof are spherical.

6. The self-balancing tilting pad bearing according to claim 5, characterized in that: The balance bridge mechanism further comprises a sleeve, the inner ring is provided with a tile pivot hole, and the sleeve is installed in the tile pivot hole; The outer cylindrical surface of the sleeve is processed with an external thread, and the inner cylindrical surface is processed with a plurality of annular grooves.

7. The self-balancing tilting pad bearing according to claim 4, characterized in that: A mounting hole penetrating the balancing bridge and the balancing bridge pad is provided at the center of the balancing bridge. The balancing bridge is sleeved on the fuel injector located directly below through the mounting hole, and there is a gap between the mounting hole and the fuel injector.

8. The self-balancing tilting pad bearing according to claim 7, characterized in that: The single-side gap between the mounting hole and the fuel injection nozzle is 2-3 mm.

9. The self-balancing tilting pad bearing according to claim 4, characterized in that: The curvature radius of the outer side of the balancing bridge is smaller than the curvature radius of the inner side of the outer ring, and a gap is formed between the outer sides of both ends of the balancing bridge and the inner side of the outer ring, and the gap is 1.5-2.5 mm.

10. The self-balancing tilting pad bearing according to claim 4, characterized in that: The balancing bridge mechanism also includes a balancing bridge limit pin installed on the two axial end surfaces of the balancing bridge, and a balancing bridge limit pin matching hole is opened at the corresponding position of the lower half end wall of the bearing housing, and the other end of the balancing bridge limit pin is installed in the balancing bridge limit pin matching hole, and the single-sided clearance between the balancing bridge limit pin and the balancing bridge limit pin matching hole is 1-1.5mm.

11. The self-balancing tilting pad bearing according to claim 6, characterized in that: A pad block is installed in the middle of the back side of the tilting pad, and pad limit pins are installed on both axial end surfaces of the tilting pad. The outer circumferential surface of the pad block is a cylindrical surface, and the cylindrical surface contacts the spherical surface of the upper end of the pad pivot to form a point support.

12. The self-balancing tilting pad bearing according to claim 11, characterized in that: A tile limit pin matching hole is opened at the corresponding position of the bearing end cover, and the other end of the tile limit pin is installed in the tile limit pin matching hole. The single-side clearance between the tile limit pin and the tile limit pin matching hole is 1-1.5mm.

13. The self-balancing tilting pad bearing according to claim 11, characterized in that: The curvature radius of the back of the tilting pad is smaller than the curvature radius of the inner side of the inner ring.

14. The self-balancing tilting pad bearing according to claim 11, characterized in that: The inner side of the inner ring is provided with arc grooves on both sides of the pivot hole of the shoe block. The arc grooves smoothly transition with the inner ring in the circumferential direction and the arc grooves penetrate the inner ring axially.

15. The self-balancing tilting pad bearing according to claim 12, characterized in that: The maximum depth of the arc groove is 1.5-2 mm.

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