A plain bearing assembly and a method of assembling the same

Abstract

The application provides a sliding bearing assembly and an assembling method thereof, and relates to the field of sliding bearings.The sliding bearing assembly comprises a bearing seat and a bearing body, and the bearing body comprises a supporting part and an oil collecting part, and the inner holes of the supporting part and the oil collecting part are matched with the gap of a motor shaft, an annular oil collecting groove is arranged on the inner surface of the oil collecting part close to the supporting part, the oil collecting groove is coaxial with the motor shaft, a plurality of oil discharge holes are arranged on the groove bottom of the lower half of the oil collecting groove, and the outer ends of the oil discharge holes are communicated with a collecting system.The application can reduce the workload during the maintenance and installation of the sliding bearing.

Description

Technical Field

[0001] This invention relates to the field of sliding bearings, and more particularly to a sliding bearing assembly and its assembly method. Background Technology

[0002] Electric motors, especially large and medium-sized generators, widely use sliding bearings as rotor support components. Sliding bearings rely on the lubricating oil film formed between the bearing shell and the rotor journal to support, lubricate and cool the rotor. They have high load-bearing capacity, low operating vibration, and can adapt to the long-term continuous and heavy-load operation requirements of generators.

[0003] To suppress the outward leakage of high-pressure lubricating oil along the rotor journal axially, existing technology typically assembles independent brass scraper plates at both ends of the sliding bearing using bolts. This prevents the lubricating oil from leaking outward, and the lubricating oil is discharged from the radial oil drain groove between the bearing end and the scraper plate. This scraper plate is a separately machined component. During the on-site assembly of the unit, it is necessary to align the scraper plate with the sliding bearing and re-grind and adjust the inner diameter of the scraper plate to ensure that the assembly clearance between the scraper plate and the rotor journal meets the design requirements. When the sliding bearing is disassembled for subsequent unit maintenance, repair, and overhaul, the scraper plate is also disassembled. Reassembly requires re-alignment, re-grinding, and readjustment of the clearance with the rotor journal.

[0004] Among the above technical solutions, the on-site assembly of the split-type oil scraper has a high technical threshold and is difficult to operate. Even a slight deviation in clearance control can cause bearing oil leakage. After each maintenance and disassembly of the bearing, it is necessary to redo the concentricity finding, scraping and grinding repair work, resulting in a large amount of maintenance work in the later stage. Summary of the Invention

[0005] To address the technical problem of inconvenient disassembly and assembly of the oil scraper in sliding bearings in the prior art, this invention provides a sliding bearing assembly and its assembly method, which can reduce the workload during the maintenance and installation of sliding bearings.

[0006] In a first aspect, the present invention provides a sliding bearing assembly and its assembly method to solve the above-mentioned technical problems, including a bearing housing and a bearing body. Along the axial direction, the bearing body includes a support portion and an oil collecting portion. The inner holes of the support portion and the oil collecting portion are both clearance-fitted with the motor shaft. An annular oil collecting groove is provided on the inner surface of the oil collecting portion near the support portion. The oil collecting groove is coaxial with the motor shaft. A plurality of oil drain holes are provided at the bottom of the lower half of the oil collecting groove. The outer ends of the oil drain holes are connected to a collection system.

[0007] This invention divides the bearing body axially into a support section and an oil collection section. The support section provides radial support and lubrication, while the oil collection section intercepts and collects the axially sprayed lubricating oil through an annular oil collection groove on its inner wall. The collected lubricating oil is then discharged to an external collection system through an oil drain hole at the bottom of the lower half of the oil collection groove. Compared with the existing separate oil scraper that requires independent on-site installation, alignment, and scraping and repair, this invention integrates the oil scraping and leak-proof structure with the bearing body. The oil collection groove and oil drain hole are formed during the bearing body machining process, and the clearance between the oil collection groove and the motor shaft is completed in one machining operation along with the inner hole of the bearing body. This eliminates the need for separate on-site assembly and repair, simplifying the installation and maintenance of sliding bearings and significantly reducing the difficulty of operation and the workload of subsequent maintenance.

[0008] Furthermore, a Babbitt alloy layer is provided on the inner wall of both the support portion and the oil collecting portion.

[0009] This invention utilizes a Babbitt alloy layer to effectively protect the journal from damage when the motor shaft rotates at high speed, while also greatly preventing metal debris from clogging the oil drain hole due to wear on the inner wall of the oil collection part.

[0010] Furthermore, the upper part of the oil collecting section is provided with a vent hole, the upper end of which is connected to the outside, and the lower end of which is connected to the oil collecting groove.

[0011] This invention connects the top of the oil collection tank to the outside atmosphere through a vent hole in the upper part of the oil collection section, allowing the high-pressure gas in the upper part of the oil collection tank to be released. This disrupts the formation conditions of the high-pressure zone in the gas ring, weakens the pumping effect from the gas pressure level, and keeps the gas pressure inside the oil collection tank balanced with the outside. This greatly avoids the pumping effect that would squeeze the oil towards the shaft end and cause leakage. The vent hole also helps the oil collection tank to more effectively intercept and collect the lubricating oil sprayed along the shaft, further improving the oil leakage prevention performance.

[0012] Furthermore, the vent hole has a Z-shaped structure, and an annular condensation groove is provided on the inner wall of the vent hole near the oil collection tank.

[0013] The Z-shaped bend structure of the vent hole in this invention causes the oil mist to impact the hole wall multiple times as it flows through the vent hole. The oil droplets in the oil mist condense during the impact and flow back to the oil collection tank along the wall surface. The annular condensation tank further captures the condensed oil droplets. The oil is guided back to the oil collection tank by the oil storage and guiding effect of the groove. This not only ensures the effective release of gas pressure in the oil collection tank, but also significantly reduces the emission of oil mist with the gas. It has the dual effect of pressure relief and environmental protection, and avoids the oil mist overflow pollution problem that may be caused by straight-through vent holes.

[0014] Furthermore, the diameter of the oil drain hole is greater than the width of the oil collection groove.

[0015] The diameter of the drain hole in this invention is larger than the width of the oil collection tank, so that the drain hole inlet forms an enlarged collection area on the bottom surface of the oil collection tank that extends beyond the tank wall. This expands the window range for oil to fall into the drain hole, improves the oil capture rate, and at the same time greatly prevents the rotating gas ring from forming a complete closed liquid film at the drain hole inlet, thus avoiding oil discharge interruption caused by the gas ring covering.

[0016] Furthermore, the bearing body has a split structure, and both the support portion and the oil collection portion include an upper half and a lower half.

[0017] Furthermore, the oil collection groove located in the lower half includes a groove one and a groove two that are connected to each other. The groove one and the groove two are symmetrically arranged along the vertical center plane of the bearing body. The groove depth of the groove one gradually increases along the direction from the horizontal end to the vertical end. The oil drain hole is close to the vertical end of the groove one and is arranged radially along the lower half.

[0018] This invention designs the lower oil collection trough as a symmetrical structure consisting of trough one and trough two, with the trough depth gradually increasing from the horizontal end to the vertical end. The oil drain hole is located near the vertical end (i.e., the bottom area), forming an oil collection channel that follows the direction of gravity. When the motor shaft rotates, the oil circulating in the oil collection trough in a single direction naturally slows down and thickens as it flows through the area where the trough depth gradually increases, forming a local oil pool at the inlet of the oil drain hole that facilitates settling, significantly improving the oil capture efficiency. The symmetrical arrangement of trough one and trough two ensures that regardless of whether the motor shaft rotates clockwise or counterclockwise, there is a change in the depth of the oil collection trough in one direction that can guide the oil to converge towards the oil drain hole, effectively adapting to the installation requirements of motors with different rotation directions.

[0019] Furthermore, it also includes four insulating pads, which are disposed inside the bearing housing. The four insulating pads are evenly disposed above, below, and on the left and right sides of the support. The insulating pads located on the left and right sides of the support are provided with oil inlet holes, which are connected to the oil inlet groove on the lower horizontal end of the support.

[0020] This invention arranges four insulating pads evenly on the top, bottom, left, and right sides of the support. Compared with the conventional practice of setting an external insulating pad between the bearing seat base plate and the mounting base plate, the insulating pads are far away from the lubricating oil discharge path, avoiding the contamination of the insulating surface by lubricating oil leakage and ensuring the insulation reliability of the sliding bearing during long-term operation.

[0021] Furthermore, the bearing housing includes a seat body and a housing arranged vertically opposite each other. Both the seat body and the housing are provided with a semi-circular receiving groove. The insulating pad and the bearing body are both disposed in the receiving groove. Oil baffles are also provided at both ends of the bearing housing along the axial direction. The oil baffles are annular structures and are coaxially arranged with the motor shaft. A sealing ring is provided between the inner wall of the oil baffle and the motor shaft.

[0022] This invention achieves secondary sealing through an annular oil baffle. On the basis of the primary oil scraping and leakage prevention in the oil collection section, it further intercepts trace amounts of oil mist or droplets that may pass through the oil collection section, forming a double leakage prevention line to ensure that the bearing assembly can achieve a reliable sealing effect under various working conditions and prevent lubricating oil from leaking to the outside.

[0023] Secondly, the present invention also provides a method for assembling a sliding bearing assembly, wherein the sliding bearing assembly is the aforementioned sliding bearing assembly, comprising the following steps: S1: Place the lower half of the bearing body below the motor shaft, so that the inner holes of the support part and the oil collection part are in clearance fit with the motor shaft; S2: The upper half of the bearing body is fastened to the motor shaft from above, and the upper half and the lower half are connected by bolts at the horizontal split, so that the oil collection groove on the inner surface of the oil collection part is coaxial with the motor shaft; S3: The four insulating pads are evenly arranged on the top, bottom and left and right sides of the support. The oil baffle with the sealing ring is sleeved on the motor shaft. The assembled bearing body and the insulating pads are placed together in the receiving groove of the already installed seat. S4: Fasten the housing, connect the housing to the base with bolts, and fix the oil baffle at both ends of the base in the axial direction with bolts, so that the oil baffle is coaxial with the motor shaft; S5: Connect the outer ends of the multiple oil drain holes provided at the bottom of the lower half of the oil collection tank to the collection system.

[0024] As can be seen from the above technical solutions, the present invention has the following advantages: This invention provides a sliding bearing assembly and its assembly method, integrating the oil scraping and leak-proof structure with the bearing body. The oil collection groove and oil drain hole are formed during the bearing body machining process, and the fit clearance between the assembly and the motor shaft is completed in one step along with the inner bore of the bearing body, eliminating the need for separate on-site assembly and repair. This simplifies the installation and maintenance of the sliding bearing, significantly reducing operational difficulty and subsequent maintenance workload. Through the Babbitt alloy layer, when the motor shaft rotates at high speed, the Babbitt alloy layer effectively protects the journal from damage, while also greatly preventing metal debris from clogging the oil drain hole due to wear on the inner wall of the oil collection section. The vent hole connects the top of the oil collection groove to the outside atmosphere, allowing the high-pressure gas in the upper part of the oil collection groove to be released, thus breaking the high pressure of the gas ring. The formation conditions of the oil collection tank weaken the pumping effect at the gas pressure level, keeping the gas pressure inside the oil collection tank balanced with the external environment. This greatly avoids the pumping effect that would squeeze the oil towards the shaft end, causing leakage. The vent holes help the oil collection tank more effectively intercept and collect the lubricating oil sprayed along the shaft, further improving the oil leakage prevention performance. The Z-shaped bend structure of the vent holes causes the oil mist to impact the hole walls multiple times as it flows through them. The oil droplets in the oil mist condense during the impact and flow back to the oil collection tank along the wall surface. The annular condensation tank further captures the condensed oil droplets. The oil is guided back to the oil collection tank by the oil storage and guiding effect of the grooves. This not only ensures the effective release of gas pressure in the oil collection tank but also significantly reduces the emission of oil mist with the gas, achieving both pressure relief and environmental protection effects. This design avoids the oil mist overflow and contamination problems that might occur with straight-through vents. The diameter of the drain hole is larger than the width of the oil collection tank, creating a flared collection area at the bottom of the tank that extends beyond the tank wall. This expands the window area for oil to fall into the drain hole, improving the oil capture rate. Simultaneously, it significantly prevents the rotating air ring from forming a completely closed liquid film at the drain hole inlet, avoiding oil drainage interruptions caused by air ring coverage. The lower part of the oil collection tank is designed as a symmetrical structure consisting of two sections, with the tank depth gradually increasing from the horizontal end to the vertical end. The drain hole is located near the vertical end (i.e., the bottom area), forming an oil collection channel aligned with the direction of gravity. When the motor shaft rotates, the oil circulating in the oil collection tank in a single direction... As the oil flows through the area where the groove depth gradually increases, it naturally slows down and thickens, forming a local oil pool at the oil drain hole inlet that facilitates settling, significantly improving the oil capture efficiency. The symmetrical arrangement of groove one and groove two ensures that regardless of whether the motor shaft rotates clockwise or counterclockwise, there is a change in the depth of the oil collection groove in one direction, which can guide the oil to converge towards the oil drain hole, effectively adapting to the installation requirements of motors with different rotation directions. Four insulating pads are evenly placed on the top, bottom, left, and right sides of the support. Compared with the conventional practice of placing an external insulating pad between the bearing seat base plate and the mounting base plate, the insulating pads are far away from the lubricating oil discharge path, avoiding the contamination of the insulating surface by lubricating oil leakage, and ensuring the insulation reliability of the sliding bearing during long-term operation.A secondary seal is achieved through an annular oil baffle. Building upon the initial oil scraping and leak-proofing at the oil collection point, it further intercepts any trace amounts of oil mist or droplets that might penetrate the collection point, forming a double leak-proof defense. This ensures reliable sealing of the bearing assembly under various operating conditions, preventing lubricating oil leakage to the outside. Attached Figure Description

[0025] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description 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.

[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0027] Figure 2 This is a schematic diagram of the assembly structure of the bearing body and the insulating pad in Embodiment 1 of the present invention.

[0028] Figure 3 This is a schematic diagram of the assembly structure of the support part and the insulating pad in Embodiment 1 of the present invention.

[0029] Figure 4 This is a schematic diagram of the oil collection section in Embodiment 1 of the present invention.

[0030] Figure 5 This is a schematic diagram of the oil collection section in Embodiment 2 of the present invention.

[0031] Figure 6 This is a schematic diagram of the structure of the vent and condensation tank in Embodiment 2 of the present invention.

[0032] In the diagram, 1. Housing; 2. Sealing body; 3. Sealing ring; 4. Motor shaft; 5. Oil baffle; 6. Insulating pad; 7. Lower half; 8. Upper half; 9. Oil inlet hole; 10. Oil inlet groove; 11. Babbitt alloy layer; 12. Support part; 13. Oil collection groove; 1301. Groove 1; 1302. Groove 2; 14. Oil drain hole; 15. Oil collection part; 16. Vent hole; 17. Condensation groove; 18. Bearing body; 19. Bearing seat. Detailed Implementation

[0033] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Implementation Method 1 In conventional sliding bearings, the oil scraper and bearing body are separate components. During installation, on-site alignment and clearance adjustments are required. Subsequent maintenance requires repeating these steps, resulting in high operational difficulty, a high technical threshold, and a large maintenance workload. To address these issues, such as... Figure 1 and Figure 2 As shown, this embodiment provides a sliding bearing assembly and its assembly method, which includes a bearing housing 19 and a bearing body 18. Along the axial direction, the bearing body 18 includes a support portion 12 and an oil collecting portion 15. The inner holes of the support portion 12 and the oil collecting portion 15 are clearance-fitted with the motor shaft 4. The oil collecting portion 15 is provided with an annular oil collecting groove 13 near the inner surface of the support portion 12. The oil collecting groove 13 is coaxial with the motor shaft 4. The bottom of the lower half 7 of the oil collecting groove 13 is provided with a plurality of oil drain holes 14. The outer end of the oil drain hole 14 is connected to the collection system. Specifically, the support part 12 and the oil collecting part 15 are an integrated structure, both of which are cylindrical and coaxially arranged. The inner hole of the support part 12 forms a lubrication gap with the motor shaft 4, and the inner hole of the oil collecting part 15 forms a clearance fit with the motor shaft 4. The oil collecting groove 13 is an annular groove recessed from the inner wall of the oil collecting part 15 towards the outer diameter direction. Its cross-sectional shape can be rectangular, trapezoidal, or arc-shaped, used to intercept and collect the lubricating oil sprayed along the axial direction of the motor shaft 4. The oil drain hole 14 is along the diameter of the oil collecting part 15. Extending in the direction of rotation, an oil return chamber is provided at a corresponding position within the bearing housing 19. An oil drain hole 14 communicates with the oil return chamber, which is connected to an oil outlet pipe. The oil outlet pipe is connected to an external collection system via a pipeline. This collection system is a lubricating oil recovery pipeline or an oil tank. There are 4 to 6 oil drain holes 14, spaced circumferentially along the lower half 7 of the oil collection groove 13. The oil collection groove 13 and oil drain holes 14 are formed in one step during the machining of the bearing body 18 by turning or milling. The clearance between the oil collection groove 13 and the motor shaft 4 is completed synchronously with the machining of the inner hole of the bearing body 18. During operation, the support part 12 provides radial support and lubrication. The oil collection part 15 intercepts and collects the axially sprayed lubricating oil through the oil collection groove 13. The collected lubricating oil is then discharged to the external collection system through the oil drain holes 14.

[0035] Compared with the separate oil scraper blades in the prior art that require separate on-site installation, alignment, and scraping and repair, this embodiment integrates the oil scraping and leak prevention structure with the bearing body 18 into one unit. The oil collection groove 13 and the oil drain hole 14 are formed during the processing of the bearing body 18. The fit clearance between them and the motor shaft 4 is completed in one step with the inner hole of the bearing body 18, eliminating the need for separate on-site assembly and repair. This simplifies the installation and maintenance of the sliding bearing and significantly reduces the difficulty of operation and the workload of subsequent maintenance.

[0036] The Babbitt alloy layer is the core friction-reducing working surface of the sliding bearing. If the inner wall of the oil collection part 15 is not protected by the Babbitt alloy layer, the motor shaft 4 will directly damage the journal surface and generate metal debris if it accidentally comes into contact with the inner wall of the oil collection part 15 during high-speed rotation. These debris may enter the oil drain hole 14 and cause blockage. Therefore, if... Figures 1 to 4 As shown, in this embodiment, a Babbitt alloy layer is provided on the inner wall of both the support portion 12 and the oil collection portion 15. Specifically, the Babbitt alloy layer is attached to the inner wall surface of the support portion 12 and the oil collection portion 15 by centrifugal casting or static casting, with a casting thickness of 2mm to 5mm. After casting, the inner hole is machined to the designed size by machining. The Babbitt alloy layer effectively protects the journal, preventing the journal from being scratched or roughened. At the same time, its good embedding performance can accommodate small hard particles in the lubricating oil, preventing these particles from scratching the journal surface or entering the oil drain hole 14 and causing blockage.

[0037] When the oil in the oil collection tank 13 is swept at high speed by the rotating air ring past the inlet of the oil drain hole 14, if the inlet size of the oil drain hole 14 is too small, the oil is easily carried away by the air ring and cannot fall into the oil drain hole 14. At the same time, the oil film carried by the air ring may completely cover the orifice, forming a closed liquid film, causing the oil draining to be interrupted. To solve the above problems, such as Figure 1 and Figure 2 As shown, in this embodiment, the diameter of the oil drain hole 14 is larger than the width of the oil collection tank 13. Specifically, taking an oil collection tank 13 width of 8mm as an example, the diameter of the oil drain hole 14 is set to 12mm to 16mm, and the ratio of the diameter of the oil drain hole 14 to the width of the oil collection tank 13 is 1.5 to 2.0. During operation, the diameter of the oil drain hole 14 is larger than the width of the tank, so that the inlet of the oil drain hole 14 forms a flared collection area on the bottom surface of the oil collection tank 13 that extends beyond the tank wall, thereby expanding the window range for oil to fall into the oil drain hole 14. Even if the oil oscillates circumferentially due to speed fluctuations or vibrations, it can still fall into the inlet range of the oil drain hole 14.

[0038] like Figure 3 and Figure 4 As shown, in this embodiment, the bearing body 18 has a split structure, and both the support part 12 and the oil collecting part 15 include an upper half 8 and a lower half 7. Specifically, the bearing body 18 is divided into an upper half 8 and a lower half 7 along a horizontal plane passing through its axis. The upper half 8 and the lower half 7 are fixedly connected at the horizontal dividing plane by multiple connecting bolts, with the number of connecting bolts being 4 to 8. The upper half 8 and the lower half 7 are provided with positioning pin holes at the horizontal dividing plane for precise positioning during assembly. During operation, when it is necessary to assemble the bearing body 18, the lower half 7 is first placed below the motor shaft 4, and then the upper half 8 is fastened onto the motor shaft 4 from above. Finally, the upper half 8 and the lower half 7 are fixedly connected as one unit by connecting bolts.

[0039] Insulation of the bearing to ground is a crucial measure to prevent shaft current from damaging the bearing and journal. The conventional practice is to install an external insulating pad between the bearing housing base plate and the mounting base plate. However, this external insulating pad is exposed to the external environment and is susceptible to contamination from dust, moisture, and oil, leading to its failure. Therefore, if... Figure 1 and Figure 2 As shown, this embodiment also includes four insulating pads 6, which are disposed inside the bearing housing 19. The four insulating pads 6 are evenly distributed above, below, left, and right sides of the support portion 12. Specifically, the four insulating pads 6 are respectively arranged above, below, to the left, and to the right of the support portion 12, with an included angle of 90° between adjacent insulating pads 6. Each insulating pad 6 is fixedly connected to the support portion 12 by insulating bolts. The outer surface of the insulating pad 6 is in contact with the inner wall surface of the bearing housing 19, so that the bearing body 18 is in an insulated and suspended state relative to the bearing housing 19. The insulating pads 6 are made of epoxy fiberglass laminate with a thickness of 5mm to 15mm and a volume resistivity ≥1×10¹³Ω·cm. During operation, the bearing body 18 is supported inside the bearing housing 19 by four insulating pads 6. The insulating pads 6 form an electrical isolation layer between the bearing body 18 and the bearing housing 19, blocking the path of shaft current from the bearing body 18 through the bearing housing 19 to the ground. Since the insulating pads 6 are set inside the bearing housing 19, away from the lubricating oil discharge path and working environment, the contamination of the insulating surface by leaking lubricating oil and external environmental factors is avoided, thereby ensuring the insulation reliability of the sliding bearing during long-term operation. If the oil draining structure is still the external scraper method of the existing technology, the lubricating oil will spray and splash at the bearing end and flow along the outer wall of the bearing body. Even the built-in insulating pad 6 will inevitably be soaked in oil, leading to insulation failure. In this solution, because the oil collection groove 13 and the oil drain hole 14 are integrated inside the bearing body 18, the high-pressure lubricating oil is intercepted before reaching the bearing end and discharged directionally to the external collection system through the oil drain hole 14 of the lower half 7. The main flow path of the lubricating oil is limited to the lower half 7 area of ​​the bearing body 18 and away from the outer peripheral surface of the support part 12. This avoids the lubricating oil from splashing irregularly in the inner cavity of the bearing seat 19 and flowing along the outer wall of the bearing body to the installation position of the insulating pad 6. There is a close technical connection between the oil draining and collecting structure and the built-in insulating pad 6, with functional coupling and mutual support. The two work together to make the insulation reliability advantage of the built-in insulation layout truly realized.

[0040] Conventional bearing housing 19 oil supply requires a separate through-hole oil inlet channel to be opened on the bearing housing 19 shell 1, which increases the processing steps and sealing points. To simplify the oil circuit layout, in this embodiment, oil inlet holes 9 are provided on the insulating pads 6 located on the left and right sides of the support part 12. The oil inlet holes 9 are connected to the oil inlet groove 10 on the horizontal end of the lower half 7 of the support part 12. Specifically, the oil inlet holes 9 are provided through the insulating pads 6 along the thickness direction, and their diameter is 6mm to 10mm. The oil inlet groove 10 is a semi-annular oil groove opened at the horizontal dividing surface of the lower half 7 of the support part 12, with a width of 4mm to 8mm and a depth of 3mm to 6mm. The oil inlet groove 10 is connected to the inner hole of the support part 12 through multiple radial oil holes, which are arranged at intervals along the circumference of the support part 12. During operation, the high-pressure lubricating oil supplied by the external oil supply system enters the oil inlet groove 10 at the horizontal end of the support part 12 through the oil inlet hole 9 on the insulating pad 6, and then enters the lubrication gap between the bearing bush and the journal through the radial oil hole. This structure expands the insulating pad 6 from a single insulating element into a multifunctional element that combines insulation and oil supply channels. It eliminates the need to separately open a through oil inlet channel on the bearing housing 19 housing 1, reducing the processing steps and sealing points of the bearing housing 19, while shortening the oil inlet path, which is conducive to the lubricating oil reaching the lubrication area quickly and evenly.

[0041] In order to provide a closed working environment for the bearing assembly and to form a secondary sealing defense on the basis of the primary leak prevention of the oil collection part 15, in this embodiment, the bearing housing 19 includes a seat body 2 and a housing 1 arranged vertically opposite each other. Both the seat body 2 and the housing 1 are provided with a semi-circular receiving groove. The insulating pad 6 and the bearing body 18 are both arranged in the receiving groove. Oil baffles 5 are also provided at both ends of the bearing housing 19 in the axial direction. The oil baffles 5 have an annular structure and are coaxially arranged with the motor shaft 4. A sealing ring 3 is provided between the inner wall of the oil baffles 5 and the motor shaft 4. Specifically, the base 2 and the housing 1 are fixedly connected by flange bolts. The semi-circular receiving grooves on the base 2 and the housing 1, when aligned, form a complete circular mounting cavity. The insulating pad 6 and the bearing body 18 are both housed within this mounting cavity. The outer edge of the oil baffle 5 is fixed to the end face of the bearing seat 19 by bolts. The sealing ring 3 is a lip-shaped sealing ring 3, with its lip facing inwards towards the bearing seat 19. Mounting stops are provided on the horizontal surfaces at both ends of the housing 1 and the base 2. The oil baffle 5 is bolted to the corresponding stops. The inner surface of the oil baffle 5 has three sealing grooves, each containing a sealing ring 3. During operation… The oil collecting section 15 intercepts most of the lubricating oil sprayed along the shaft. When a small amount of oil mist or droplets passes through the oil collecting section 15 and reaches the end of the bearing housing 19, it is blocked by the oil baffle plate 5. The sealing ring 3 between the inner wall of the oil baffle plate 5 and the motor shaft 4 further seals the annular gap, preventing the oil mist or droplets from escaping outward. The housing 2 and the shell 1 completely enclose the insulating pad 6 and the bearing body 18 inside, providing a closed working environment for the bearing assembly. The annular oil baffle plate 5, together with the sealing ring 3, forms a secondary sealing defense line on the basis of the primary oil scraping and leakage prevention of the oil collecting section 15, ensuring that the bearing assembly can achieve a reliable sealing effect under various working conditions and preventing lubricating oil from leaking to the outside.

[0042] Implementation Method 2 like Figure 5 and Figure 6As shown, this embodiment provides a sliding bearing assembly, whose structure is basically the same as that of Embodiment 1. The difference is that when the motor shaft 4 rotates at high speed, the journal surface drives the air and oil mist in the oil collecting groove 13 to form a high-speed rotating air ring. This air ring forms a closed high-pressure zone in the upper half 8 of the oil collecting groove 13, generating a pumping effect that squeezes the oil towards the shaft end, affecting the oil collection effect. To address this problem, in this embodiment, the upper half 8 of the oil collecting part 15 is provided with a vent hole 16. The upper end of the vent hole 16 is connected to the outside, and the lower end of the vent hole 16 is connected to the oil collecting groove 13. During operation, when the air ring forms a high-pressure zone in the upper half 8 of the oil collecting groove 13, the high-pressure gas is discharged upward to the outside atmosphere through the vent hole 16, so that the gas pressure inside the oil collecting groove 13 is balanced with the outside. The setting of the vent hole 16 disrupts the formation conditions of the high-pressure zone of the air ring, weakens the pumping effect from the air pressure level, and enables the oil collecting groove 13 to more effectively intercept and collect the lubricating oil sprayed along the shaft, further improving the oil leakage prevention performance. While the straight-through vent 16 can relieve pressure, oil mist will escape outward with the gas through the vent 16, causing oil mist pollution. To solve this problem, in this embodiment, the vent 16 has a Z-shaped structure, and an annular condensation groove 17 is provided on the inner wall of the vent 16 near the oil collection tank 13. Specifically, the Z-shaped structure means that the vent 16 bends at least twice in the axial and radial directions inside the oil collection part 15, forming more than two bending sections: a first section extending upward from the top of the oil collection tank 13, a second section extending axially after bending, and a third section extending radially to the outer wall after bending again. The condensation groove 17 is an annular groove recessed from the inner wall of the vent 16 in the outward diameter direction, with a width of 1m. The diameter of the condensation tank is 1-3 mm, the depth is 0.5 mm-1.5 mm, and the number of condensation tanks 17 is 1-3, arranged at intervals along the axial direction of the vent 16. During operation, the oil mist enters the vent 16 with the gas and impacts the hole wall multiple times at the Z-shaped bend. The oil droplets in the oil mist condense during the impact and flow along the wall. The condensation tank 17 captures these condensed oil droplets and collects them. The collected oil flows back to the oil collection tank 13 along the hole wall under the action of gravity. The gas phase components can be discharged smoothly through the bend channel due to their small molecular size. This structure not only ensures the effective release of gas pressure in the oil collection tank 13, but also significantly reduces the oil mist emission with the gas, avoiding the oil mist overflow pollution problem that may be caused by the straight-through vent 16.

[0043] If the bottom depth of the oil collection tank 13 is designed to be uniform, the oil will have a short residence time and high flow velocity at the inlet of the oil drain hole 14, which is not conducive to the oil settling into the oil drain hole 14. To optimize the oil collection and guiding effect, such as Figure 5 and Figure 6As shown, in this embodiment, the oil collection groove 13 located in the lower half 7 includes a first groove 1301 and a second groove 1302 that are connected. The first groove 1301 and the second groove 1302 are symmetrically arranged along the vertical center plane of the bearing body 18. The groove depth of the first groove 1301 gradually increases from the horizontal end to the vertical end, and the groove depth of the second groove 1302 gradually increases from the horizontal end to the vertical end. The oil drain hole 14 is close to the vertical end of the first groove 1301 and the second groove 1302, and the oil drain hole 14 is arranged radially along the lower half 7. Specifically, groove 1301 is located on one side of the vertical center plane, and groove 2 1302 is located on the other side of the vertical center plane. The bottoms of groove 1301 and groove 2 1302 are connected to each other at the lowest point of the bearing body 18. The depth of groove 1301 at its horizontal end is 4mm to 6mm, and the depth at its vertical end is 10mm to 14mm. The depth changes in a uniform linear manner. Similarly, the groove depth of groove 2 1302 also gradually increases from its horizontal end to its vertical end. The oil drain hole 14 is located at the lowest point of the intersection of the vertical ends of the first groove 1301 and the second groove 1302. During operation, when the motor shaft 4 rotates, the oil circulating in the oil collection groove 13 in a single direction naturally slows down and thickens as it flows through the area where the groove depth gradually increases, forming a local oil pool at the inlet of the oil drain hole 14. Air bubbles in the oil escape here, and the oil settles into the oil drain hole 14 under the action of gravity. The symmetrical arrangement of the first groove 1301 and the second groove 1302 ensures that regardless of whether the motor shaft 4 rotates clockwise or counterclockwise, there is a change in the depth of the oil collection groove 13 in one direction, which can guide the oil to converge towards the oil drain hole 14. This structure effectively adapts to the installation requirements of motors with different rotation directions, has stronger versatility, and significantly improves the oil capture efficiency.

[0044] Implementation Method 3 This embodiment provides an assembly method for a sliding bearing assembly, used to assemble the sliding bearing assembly of Embodiment 2, including the following steps: S1: Place the lower half 7 of the bearing body 18 below the motor shaft 4, so that the inner holes of the support part 12 and the oil collection part 15 are clearance-fitted with the motor shaft 4; specifically, the bearing body 18 is a split structure, and the support part 12 and the oil collection part 15 each include an upper half 8 and a lower half 7. During assembly, first place the lower half 7 in the installation position below the motor shaft 4, so that a lubrication gap is formed between the inner hole of the support part 12 and the motor shaft 4, and a clearance fit is formed between the inner hole of the oil collection part 15 and the motor shaft 4.

[0045] S2: The upper half 8 of the bearing body 18 is fastened to the motor shaft 4 from above, and the upper half 8 and the lower half 7 are connected by bolts at the horizontal parting surface, so that the oil collection groove 13 on the inner surface of the oil collection part 15 is coaxial with the motor shaft 4; specifically, the upper half 8 and the lower half 7 are fixedly connected at the horizontal parting surface by multiple connecting bolts, the number of connecting bolts being 4 to 8. The upper half 8 and the lower half 7 are provided with positioning pin holes at the horizontal parting surface for precise positioning during assembly; after fastening, the oil collection groove 13 is coaxially arranged with the motor shaft 4. The oil collection groove 13 is an annular groove recessed from the inner wall of the oil collection part 15 towards the outer diameter direction. Its fitting clearance with the motor shaft 4 is completed synchronously with the machining of the inner hole of the bearing body 18, without the need for separate on-site alignment or scraping and grinding.

[0046] S3: Four insulating pads 6 are evenly arranged above, below, and on both sides of the support portion 12. The oil baffle 5 with the sealing ring 3 is fitted onto the motor shaft 4. The assembled bearing body 18 and the insulating pads 6 are placed together in the receiving groove of the already installed seat 2. Specifically, the four insulating pads 6 are respectively arranged above, below, to the left, and to the right of the support portion 12, with an included angle of 90° between adjacent insulating pads 6. Each insulating pad 6 is fixedly connected to the support portion 12 by insulating bolts. The outer side of the pad 6 contacts the inner wall of the bearing housing 19, so that the bearing body 18 is in an insulated and suspended state relative to the bearing housing 19; the oil baffle 5 is a ring structure, and the oil baffle 5 is coaxially arranged with the motor shaft 4. A sealing ring 3 is provided between the inner wall of the oil baffle 5 and the motor shaft 4. The sealing ring 3 is a lip sealing ring 3, and its lip faces the inside of the bearing housing 19. The inner surface of the oil baffle 5 is provided with three sealing grooves, and a sealing ring 3 is provided in each sealing groove; the seat body 2 is provided with a semi-circular receiving groove, and the insulating pad 6 and the bearing body 18 are both placed in the receiving groove.

[0047] S4: Fasten the housing 1, connect the housing 1 to the base 2 with bolts, and fix the oil baffle 5 at both ends of the base 2 in the axial direction with bolts, so that the oil baffle 5 is coaxially arranged with the motor shaft 4; Specifically, the base 2 and the housing 1 are arranged vertically opposite each other, and both the base 2 and the housing 1 are provided with semi-circular receiving grooves. The base 2 and the housing 1 are fixedly connected by flange bolts. After the semi-circular receiving grooves on the base 2 and the housing 1 are aligned, they form a complete circular mounting cavity. The insulating pad 6 and the bearing body 18 are both accommodated in the mounting cavity; The outer edge of the oil baffle 5 is fixed to the end face of the bearing seat 19 with bolts. The horizontal surfaces at both ends of the housing 1 and the base 2 are provided with mounting stops. The oil baffle 5 is set at the corresponding stops with bolts, so that the oil baffle 5 is coaxially arranged with the motor shaft 4.

[0048] S5: Connect the outer ends of the multiple oil drain holes 14 provided at the bottom of the lower half 7 of the oil collection groove 13 to the collection system; specifically, the oil drain holes 14 extend in the radial direction of the oil collection part 15, and a return oil chamber is provided at the corresponding position in the bearing seat 19. The oil drain holes 14 are connected to the return oil chamber, and the return oil chamber is connected to the oil outlet pipe. The oil outlet pipe is connected to the external collection system through a pipeline. The collection system is a lubricating oil recovery pipeline or an oil tank; the number of oil drain holes 14 is 4 to 6, which are distributed circumferentially along the lower half 7 of the oil collection groove 13. The oil collection groove 13 and the oil drain holes 14 are formed in one step by turning or milling during the processing of the bearing body 18. The fit clearance between the oil collection groove 13 and the motor shaft 4 is completed synchronously with the processing of the inner hole of the bearing body 18.

[0049] In this embodiment, since the oil collection groove 13 and the oil drain hole 14 are formed during the machining of the bearing body 18, the fitting clearance between them and the motor shaft 4 is completed in one machining operation with the inner hole of the bearing body 18. During assembly, there is no need to separately assemble the oil scraper and perform alignment, concentricity, scraping and grinding operations on site, which simplifies the installation of the sliding bearing and significantly reduces the difficulty of operation and the workload of later maintenance.

[0050] As can be seen from the above specific embodiments, the present invention has the following beneficial effects: 1. The oil scraping and leak prevention structure is integrated with the bearing body 18 as one piece. The oil collection groove 13 and the oil drain hole 14 are formed during the processing of the bearing body 18. The fit clearance between them and the motor shaft 4 is completed in one step with the inner hole of the bearing body 18. No separate assembly and repair are required on site, which simplifies the installation and maintenance of the sliding bearing and significantly reduces the difficulty of operation and the workload of later maintenance. 2. Through the Babbitt alloy layer 11, when the motor shaft 4 rotates at high speed, the Babbitt alloy layer can effectively protect the journal from damage, and at the same time greatly avoid the metal debris generated by wear on the inner wall of the oil collection part 15 from clogging the oil drain hole 14. 3. The vent 16 connects the top of the oil collection tank 13 to the outside atmosphere, allowing the high-pressure gas in the upper part of the oil collection tank 13 to be released, thus disrupting the formation conditions of the high-pressure zone of the gas ring. This weakens the pumping effect from the perspective of gas pressure, keeping the gas pressure inside the oil collection tank 13 in balance with the outside, greatly avoiding the pumping effect that would squeeze the oil towards the shaft end and cause leakage. The vent 16 also helps the oil collection tank 13 to more effectively intercept and collect the lubricating oil sprayed along the shaft, further improving the oil leakage prevention performance. 4. The Z-shaped bend structure of the vent 16 causes the oil mist to impact the vent wall multiple times as it flows through the vent 16. The oil droplets in the oil mist condense during the impact and flow back to the oil collection tank 13 along the wall. The annular condensation tank 17 further captures the condensed oil droplets. The oil is guided back to the oil collection tank 13 by the oil storage and guiding effect of the groove. This not only ensures the effective release of gas pressure in the oil collection tank 13, but also significantly reduces the oil mist emission with the gas. It has the dual effect of pressure relief and environmental protection, and avoids the oil mist overflow pollution problem that may be caused by the straight vent 16. 5. The diameter of the oil drain hole 14 is larger than the width of the oil collection tank 13, so that the inlet of the oil drain hole 14 forms a flared collection area on the bottom surface of the oil collection tank 13 that extends beyond the tank wall, thereby expanding the window range for oil to fall into the oil drain hole 14 and improving the oil capture rate. 6. The lower half of the oil collection tank 13 is set as a symmetrical structure composed of tank 1 1301 and tank 2 1302, and the depth of the tank gradually increases from the horizontal end to the vertical end. The oil drain hole 14 is set near the vertical end (i.e. the bottom area), forming an oil collection channel in accordance with the direction of gravity. When the motor shaft 4 rotates, the oil circulating in the oil collection tank 13 in a single direction naturally slows down and thickens when it flows through the area where the depth of the tank gradually increases. A local oil pool that is conducive to settling is formed at the inlet of the oil drain hole 14, which significantly improves the oil capture efficiency. The symmetrical arrangement of tank 1 1301 and tank 2 1302 ensures that no matter whether the motor shaft 4 rotates clockwise or counterclockwise, there is a change in the depth of the oil collection tank 13 in one direction that can guide the oil to converge towards the oil drain hole 14, effectively adapting to the installation requirements of motors with different rotation directions. 7. Four insulating pads 6 are evenly placed on the top, bottom and left and right sides of the support part 12. Compared with the conventional practice of setting an external insulating pad between the bearing seat 19 base plate and the mounting base plate, the insulating pads 6 are far away from the lubricating oil discharge path, avoiding the contamination of the insulating surface by lubricating oil leakage, and ensuring the insulation reliability of the sliding bearing in long-term operation. 8. Secondary sealing is achieved through the annular oil baffle 5. On the basis of the primary oil scraping and leakage prevention of the oil collection part 15, it further intercepts the trace amount of oil mist or oil droplets that may pass through the oil collection part 15, forming a double leakage prevention line to ensure that the bearing assembly can achieve a reliable sealing effect under various working conditions and prevent lubricating oil from leaking to the outside.

[0051] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sliding bearing assembly, comprising a bearing housing (19) and a bearing body (18), characterized in that, Along the axial direction, the bearing body (18) includes a support part (12) and an oil collection part (15). The inner holes of the support part (12) and the oil collection part (15) are clearance-fitted with the motor shaft. The oil collection part (15) is provided with an annular oil collection groove (13) near the inner surface of the support part (12). The oil collection groove (13) is coaxial with the motor shaft. The bottom of the lower half (7) of the oil collection groove (13) is provided with a plurality of oil drain holes (14). The outer end of the oil drain hole (14) is connected to the collection system.

2. The sliding bearing assembly as described in claim 1, characterized in that, Both the support portion (12) and the oil collection portion (15) have a Babbitt alloy layer (11) on their inner walls.

3. The sliding bearing assembly as described in claim 1, characterized in that, The upper half (8) of the oil collecting part (15) is provided with a vent (16), the upper end of the vent (16) is connected to the outside, and the lower end of the vent (16) is connected to the oil collecting groove (13).

4. The sliding bearing assembly as described in claim 3, characterized in that, The vent (16) has a Z-shaped structure, and an annular condensation groove (17) is provided on the inner wall of the vent (16) near the oil collection groove (13).

5. The sliding bearing assembly according to any one of claims 1-4, characterized in that, The diameter of the drain hole (14) is greater than the width of the oil collection groove (13).

6. The sliding bearing assembly as described in claim 5, characterized in that, The bearing body (18) has a split structure, and the support part (12) and the oil collection part (15) each include an upper part (8) and a lower part (7).

7. The sliding bearing assembly as claimed in claim 6, characterized in that, The oil collection groove (13) located in the lower half (7) includes a connected groove one (1301) and groove two (1302). The groove one (1301) and the groove two (1302) are symmetrically arranged along the vertical center plane of the bearing body (18). Along the direction from the horizontal end to the vertical end of the groove one (1301), the groove depth of the groove one (1301) gradually increases. The oil drain hole (14) is close to the vertical end of the groove one (1301). The oil drain hole (14) is arranged radially along the lower half (7).

8. The sliding bearing assembly as claimed in claim 7, characterized in that, It also includes four insulating pads (6), which are disposed inside the bearing seat (19). The four insulating pads (6) are evenly disposed on the upper and lower and left and right sides of the support part (12). The insulating pads (6) located on the left and right sides of the support part (12) are provided with oil inlet holes (9). The oil inlet holes (9) are connected to the oil inlet groove (10) on the horizontal end of the lower half (7) of the support part (12).

9. The sliding bearing assembly as claimed in claim 8, characterized in that, The bearing housing (19) includes a seat body (2) and a housing (1) arranged opposite each other. Both the seat body (2) and the housing (1) are provided with a semi-circular receiving groove. The insulating pad (6) and the bearing body (18) are both arranged in the receiving groove. Oil baffles (5) are also provided at both ends of the bearing housing (19) in the axial direction. The oil baffles (5) are annular structures. The oil baffles (5) are coaxially arranged with the motor shaft. A sealing ring (3) is provided between the inner wall of the oil baffles (5) and the motor shaft.

10. A method for assembling a sliding bearing assembly, characterized in that, For use in the sliding bearing assembly as described in claim 9, the following steps are included: S1: Place the lower half (7) of the bearing body (18) below the motor shaft (4) so ​​that the inner holes of the support part (12) and the oil collection part (15) are in clearance fit with the motor shaft (4); S2: The upper half (8) of the bearing body (18) is fastened to the motor shaft (4) from above, and the upper half (8) and the lower half (7) are connected by bolts at the horizontal split, so that the oil collection groove (13) on the inner surface of the oil collection part (15) is coaxial with the motor shaft (4). S3: The four insulating pads (6) are evenly arranged on the upper and lower and left and right sides of the support (12), the oil baffle (5) with the sealing ring (3) is sleeved on the motor shaft (4), and the assembled bearing body (18) and the insulating pads (6) are placed together in the receiving groove of the already installed seat (2). S4: Fasten the housing (1), connect the housing (1) to the base (2) with bolts, and fix the oil baffle (5) at both ends of the base (2) in the axial direction with bolts, so that the oil baffle (5) is coaxially arranged with the motor shaft (4); S5: Connect the outer ends of the multiple oil drain holes (14) provided at the bottom of the lower half (7) of the oil collection tank (13) to the collection system.

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