Split bearing unit and installation method

Abstract

The invention provides a split bearing unit and a mounting method. The split bearing unit comprises a split bearing seat, a split bearing box, a split cylindrical roller bearing and a connecting conversion piece, the split bearing box comprises an upper bearing box and a lower bearing box, and the upper bearing box and the lower bearing box are connected through a connecting bolt to form a closed cavity; the split cylindrical roller bearing is assembled on the shaft and is arranged in the closed cavity; the split type cylindrical roller bearing comprises an inner ring, a clamping ring, a retainer, a roller and an outer ring, the bottom of the lower bearing seat is provided with a shape-following light-weight grooving structure; a counter bore is formed in the connecting end face of the lower bearing seat, and an elastic cylindrical pin is installed in the counter bore and used for positioning and looseness prevention when the lower bearing seat is connected with the upper bearing seat. A temperature measuring threaded hole is formed in the bottom of the lower bearing box; one end of the connection conversion piece is connected with the temperature measurement threaded hole, and the other end is connected with a temperature sensor; installation and use condition requirements of users can be met, use space is saved, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of bearing technology, specifically to the method of splitting bearing units and their installation. Background Technology

[0002] Small split bearing units are commonly used in cruise ships due to their high rotational speed and rapid acceleration. Therefore, to meet market demands, there is an urgent need to design small split bearing units with good load-bearing performance, long service life, and high reliability. Summary of the Invention

[0003] In view of the above problems, the purpose of this application is to provide a split bearing unit that can meet the user's installation and operating conditions, save space, and improve bearing life.

[0004] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: a split bearing unit, including a split bearing housing, a split bearing box, a split cylindrical roller bearing, and a connecting conversion component; the split bearing box includes an upper bearing box and a lower bearing box, which are connected by connecting bolts to form a closed cavity; the split cylindrical roller bearing is mounted on a shaft and disposed within the closed cavity; the split cylindrical roller bearing includes: an inner ring, which is a split structure composed of two half-inner rings; a retaining ring, which includes a first retaining ring and a second retaining ring, respectively fitted into the retaining grooves of the two half-inner rings, and the joint of the retaining ring is staggered by 90° from the joint of the inner ring; and a cage, which is a split cage composed of two half-cages. The bearing housing comprises: a split structure; rollers disposed in the roller pockets of the cage; an outer ring consisting of two half-rings; a split bearing housing including an upper bearing housing and a lower bearing housing, fitted around the outer periphery of the split bearing box; the outer diameter surface of the split bearing box being an outer spherical surface, and the inner diameter surface of the split bearing housing being an inner spherical surface that mates with the outer spherical surface; a conformal lightweight groove structure at the bottom of the lower bearing housing; a countersunk hole at the connecting end face of the lower bearing housing, into which an elastic cylindrical pin is installed for positioning and anti-loosening when connected to the upper bearing housing; a temperature sensing threaded hole at the bottom of the lower bearing box, which is a through hole located near the outer ring; and a connecting adapter connected at one end to the temperature sensing threaded hole and at the other end to a temperature sensor.

[0005] Furthermore, the side of the split bearing housing is designed with an inclined angle structure, with the top of the upper bearing housing being the narrowest and the bottom of the lower bearing housing being the widest, forming a tapered support structure that is narrow at the top and wide at the bottom; the inclination angle α of the inclined angle structure is controlled between 1° and 2°.

[0006] Furthermore, the upper half of the countersunk hole is a smooth hole, and the lower half is a threaded hole, with the elastic cylindrical pin installed in the smooth hole; the elastic cylindrical pin is a cylindrical structure with one side opening, the opening form being an alternating trapezoidal sawtooth shape and a straight opening, its outer diameter in its natural state being larger than the size of the smooth hole of the countersunk hole, and it is in a compressed and tensioned state after installation; the elastic cylindrical pin protrudes from the mounting plane of the lower bearing seat and matches the corresponding countersunk hole of the upper bearing seat.

[0007] Furthermore, the lightweight grooved structure of the lower bearing housing is located in its bottom load-bearing area and is grooved along the outer contour of the bearing housing.

[0008] Furthermore, the temperature measuring threaded hole is located near the outer ring of the bearing, with its inlet center slightly lower than the shaft height and pointing towards the inside of the bearing at a 20° elevation angle; one end of the connecting conversion component is provided with an internal thread that mates with the temperature sensor, and the other end is provided with an external thread that mates with the temperature measuring threaded hole.

[0009] Furthermore, the two connecting ends of the lower bearing housing extend radially outward to form a horizontal assembly surface, and each assembly surface is provided with a positioning bolt mounting hole; the non-load-bearing area outside the assembly surface is designed to conform to the shape and reduce weight, forming an irregular outer contour.

[0010] Furthermore, the split bearing housing is provided with a sealing groove for installing a seal.

[0011] Furthermore, a small arc notch is provided on the outer edge of the contact surface between the lower bearing seat and the upper bearing seat. The height of the small arc notch is greater than the thickness of a flathead screwdriver, which is used to pry the upper bearing seat and the lower bearing seat apart by using a screwdriver during disassembly.

[0012] Furthermore, the lower bearing housing is provided with an inclined large arc surface, which facilitates the installation of the split bearing housing and the self-aligning function between the split bearing housing and the split bearing housing.

[0013] Furthermore, the installation method for the split bearing unit includes the following steps: S1: Install the lower bearing housing: Install the lower bearing housing onto the machine body, and perform initial positioning and fixation through the positioning bolt mounting holes on its mounting surface; S2: Install the inner ring: Apply lubricating oil to the inner ring mounting section on the shaft, assemble the two half inner rings onto the shaft, and adjust the gap between the mating surfaces to be uniform. S3: Install the clamping rings: Install the first and second clamping rings into the clamping grooves of the inner half of the ring, ensuring that the joint of the clamping rings is offset from the joint of the inner ring by °, and tighten the clamping ring connecting bolts; S4: Install the cage roller assembly: Apply grease to the cage and rollers, install the two half-cage roller assemblies on the inner ring, and connect the two half-cages into a whole by means of a coupling; S5: Install the outer ring and bearing housing: Install the two half outer rings into the upper bearing housing and the lower bearing housing respectively. First, hoist the lower bearing housing assembly onto the upper side of the split cylindrical roller bearing, then rotate it to the working position. Then install the upper bearing housing assembly and tighten the connecting bolts of the split bearing housing. S6: Sealing: Install a seal in the sealing groove of the split bearing housing; S7: Install the upper bearing housing: Place the upper bearing housing onto the lower bearing housing, use the protruding elastic cylindrical pin for positioning, and finally tighten the connecting bolts between the upper and lower bearing housings to complete the installation.

[0014] Compared with existing technologies, the advantages of this invention are as follows: Addressing the requirements of the cruise ship industry for split bearing units, it provides a small split bearing unit that effectively meets user installation and operating conditions, saves space, and extends bearing life. By designing the bearing housing, bearing box, and core bearing components all as split structures, online maintenance and rapid replacement of bearings are achieved without disassembling adjacent equipment and large shaft systems, greatly improving equipment uptime. Its unique spherical fit design features automatic self-aligning, effectively compensating for alignment errors and extending bearing life. Simultaneously, the flexible cylindrical pin structure ensures precise positioning and anti-loosening of the connection, improving operational stability; the temperature monitoring interface provides real-time early warning of operating status; and combined with a lightweight design, weight and cost are reduced while maintaining performance. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the structure of the present invention; Figure 5 This is a side view of the present invention; Figure 6 This is a schematic diagram of the lower bearing housing. Figure 7 This is a top view of the lower bearing housing; Figure 8 This is a front sectional view of the lower bearing housing; Figure 9 This is a side sectional view of the lower bearing housing; Figure 10 This is a schematic diagram of the structure of a flexible cylindrical pin; Figure 11This is a front view of a flexible cylindrical pin. Figure 12 This is a top view of a flexible cylindrical pin. Figure 13 This is a schematic diagram of the structure of a flexible cylindrical pin and a bolt; Figure 14 This is a schematic diagram of the lower bearing housing. Figure 15 Left view of the connecting adapter; Figure 16 This is a sectional view of the connecting adapter; In the diagram: 1. Upper bearing housing, 2. Lower bearing housing, 3. Shaft, 4. Upper bearing seat, 5. Lower bearing seat, 6. Countersunk hole, 7. Flexible cylindrical pin, 8. Temperature measuring threaded hole, 9. Inner ring, 10. Clamping ring, 11. Cage, 12. Roller, 13. Outer ring, 14. Positioning bolt mounting hole, 15. Connecting conversion part, 16. Lightweight grooved structure, 17. Inclined large arc surface, 18. Front and rear large arc surfaces, 19. Small arc notch. Detailed Implementation

[0016] To make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0017] See appendix Figure 1-16A split bearing unit includes a split bearing housing, a split bearing box, a split cylindrical roller bearing, and a connecting conversion component 15. The split bearing box includes an upper bearing box 1 and a lower bearing box 2, which are connected by connecting bolts to form a closed cavity. The split cylindrical roller bearing is mounted on a shaft 3 and disposed within the closed cavity. The split cylindrical roller bearing includes: an inner ring 9, which is a split structure composed of two half-inner rings; a retaining ring 10, which includes a first retaining ring and a second retaining ring, respectively fitted into the retaining grooves of the two half-inner rings, and the joints of the retaining rings are staggered by 90° from the joints of the inner rings; a cage 11, which is a split structure composed of two half-cages; and rollers 12, which are disposed within the cage. The bearing housing 11 has a pocket in the roller; an outer ring 13, which is a split structure composed of two half-outer rings; the split bearing housing includes an upper bearing housing 4 and a lower bearing housing 5, which are fitted onto the outer periphery of the split bearing box; the outer diameter surface of the split bearing box is an outer spherical surface, and the inner diameter surface of the split bearing housing is an inner spherical surface that mates with the outer spherical surface; the bottom of the lower bearing housing 5 is provided with a conformal lightweight groove structure 16; the connecting end face of the lower bearing housing 5 is provided with a countersunk hole 6, and an elastic cylindrical pin 7 is installed in the countersunk hole 6 for positioning and anti-loosening when connected with the upper bearing housing 4; the bottom of the lower bearing box 2 is provided with a temperature measuring threaded hole 8, which is a through hole and is located near the outer ring 13; one end of the connecting conversion component 15 is connected to the temperature measuring threaded hole 8, and the other end is used to connect to a temperature sensor.

[0018] The split bearing housing has an inclined angle structure on its sides. The upper bearing housing 4 is narrowest at its top and the lower bearing housing 5 is widest at its bottom, forming a tapered support structure that is narrower at the top and wider at the bottom. The inclination angle α of the inclined angle structure is controlled between 1° and 2°. This structural form greatly saves space and meets the requirements for load distribution.

[0019] The upper half of the countersunk hole 6 is a smooth hole, and the lower half is a threaded hole. The elastic cylindrical pin 7 is installed in the smooth hole. The elastic cylindrical pin 7 is a cylindrical structure with one side opening. The opening shape is a combination of trapezoidal sawtooth shape and straight opening. Its outer diameter in its natural state is larger than the size of the smooth hole of the countersunk hole 6. After installation, it is in a compressed and tensioned state. The elastic cylindrical pin 7 protrudes from the mounting plane of the lower bearing seat 5 and matches the corresponding countersunk hole of the upper bearing seat 4.

[0020] The flexible cylindrical pin positioning connection is designed with an opening on one side, with an opening width of Lk. The opening structure alternates between trapezoidal sawtooth and straight openings. The plate thickness is S, the total length is L, and the outer diameter in the anti-loosening state is ∅dt, and the inner diameter is ∅dl. To improve space utilization, the flexible cylindrical pin is installed in the countersunk hole of the lower bearing housing. The blank hole size of the countersunk hole is ∅dt-0.5mm, ensuring that the opening part of the flexible cylindrical pin is compressed and in a tensioned state after installation, ensuring an integral connection with the lower bearing housing. Simultaneously, based on the arc length relationship, the compressed ∅dl dimension is calculated to be slightly larger than the bolt thread diameter for installation assurance. The flexible cylindrical pin is L in length and protrudes L / 2 from the mounting plane after installation in the lower bearing housing. The protruding part mates with the countersunk hole of the upper bearing housing, serving both a positioning function and protecting the bolt from being easily broken by shear forces.

[0021] The lightweight grooved structure 16 of the lower bearing housing 5 is located in its bottom load-bearing area and is grooved along the outer contour of the bearing housing. The lightweight grooved structure 16 is connected to the countersunk hole 6.

[0022] The temperature-measuring threaded hole 8 is located near the outer ring 13 of the bearing, with its inlet center slightly lower than the shaft height and pointing inward at a 20° angle. One end of the connecting adapter 15 has an internal thread that mates with the temperature sensor, and the other end has an external thread that mates with the temperature-measuring threaded hole 8. This design balances measurement accuracy, installation convenience, and space constraints, reflecting the integrated design of the bearing housing. A temperature-measuring threaded hole is designed at the bottom of the lower bearing housing for easy monitoring of the bearing's operating status. In this embodiment, the temperature-measuring hole is located at a 20° angle to address the issue of limited bottom space. A connecting adapter is also provided to facilitate the selection of the temperature sensor. The left side is circular, with platforms at the top and bottom for easy installation. A connecting threaded hole is designed on the left side, with a diameter (dm) matching the temperature sensor; the right side has an external thread structure that mates with the pre-reserved temperature-measuring threaded hole in the bearing housing.

[0023] The probe of the temperature sensor points to the outer ring to detect temperature changes on the outer ring end face.

[0024] The two connecting ends of the lower bearing housing 5 extend radially outward to form a horizontal assembly surface, and each assembly surface is provided with a positioning bolt mounting hole 14; the non-load-bearing area outside the assembly surface is designed to conform to the shape and reduce weight, forming an irregular outer contour.

[0025] Lightweight design of the lower bearing housing: The bottom of the lower bearing housing is grooved to follow the shape of the bearing housing; this ensures the overall strength of the bearing housing while meeting weight requirements.

[0026] To meet the requirements of lightweight yet powerful cruise ships, the lower bearing housing 15 was designed with additional features. Because it is a small, split bearing unit, two bolt holes were provided for connection to the engine body to meet installation requirements.

[0027] The split bearing housing is provided with a sealing groove for installing seals.

[0028] The outer edge of the contact surface between the lower bearing seat 5 and the upper bearing seat 4 is provided with a small arc notch 19. The height of the small arc notch 19 is greater than the thickness of a flathead screwdriver. It can be adjusted on its own to allow the upper bearing seat 4 and the lower bearing seat 5 to be separated by prying with a screwdriver during disassembly. They can be separated by gently prying with a screwdriver.

[0029] The lower bearing housing 5 is provided with an inclined large arc surface 17, which facilitates the installation of the split bearing housing and the self-aligning function between the split bearing housing and the split bearing housing.

[0030] The front and rear end faces of the lower bearing housing 5 are provided with large arc surfaces 18, which not only increases the contact area between the lower bearing housing and key parts of the machine body, making it more stable, but also saves space and reduces weight, making it both beautiful and practical.

[0031] Before installing the split bearing unit, all components do not need to be installed or pre-assembled. All components must be cleaned before assembly.

[0032] The installation method for split bearing units includes the following steps: S1: Install the lower bearing housing: Install the lower bearing housing in the desired position, install the locating pins (install if present, otherwise leave them off), and connect and secure the bolts to the bottom through the U-shaped elongated holes. Fine adjustments can be made if movement is required. The internal anti-misalignment locating pins in the lower bearing housing are now installed. Next, adjust the concentricity between the lower bearing housing and the shaft: Since the center of the lower bearing housing and the center of the shaft cannot be determined precisely, after installing the lower bearing housing, the shaft center needs to be located using axial and radial illumination methods. Simultaneously, adjust the shaft height to ensure that the shaft center and the center of the bearing housing are on the same horizontal line before proceeding with subsequent installations.

[0033] S2: Install the inner ring: Apply lubricant to the inner ring installation position, install the inner ring in the correct position, and use a feeler gauge to measure the gap between the two ends of the inner ring to ensure that the gap value is consistent.

[0034] S3: Install the clamping rings: After assembling the inner rings, immediately install the first and second clamping rings. The gap at the joint of the clamping rings should form a 90° angle with the gap at the joint of the inner rings. Then tighten all the bolts on the clamping rings. Gently tap each inner ring and clamping ring on the shaft with a soft hammer, or tap them by placing a wooden block between the hammer and the bearing components. Tighten the clamping ring bolts again. Repeat this action until the bolts are fully tightened.

[0035] S4: Install the cage roller assembly: Apply grease to the cage and roller assembly, and lightly coat the inner ring (already mounted on the shaft) with grease for protection. Install the half-cage roller assembly onto the inner ring. The two half-cage assemblies are connected together by bolts, clips, locking clips, etc., depending on the design.

[0036] S5: Install the outer ring and bearing housing: Install the half-outer ring into the upper and lower bearing housings respectively, ensuring that the end faces of the outer ring extending from the bearing housing match. If the bearing housing is equipped with a side push rod, installation can be completed at this time. If the bearing housing has bolts on both sides for connecting to the outer ring, install the connecting bolts. After assembling the half-outer ring into the upper and lower bearing housings respectively, assemble the lower bearing housing assembly first on the upper side of the bearing. Then, rotate the lower bearing housing and outer ring 180° to the correct matching position, and apply the prescribed amount of grease to the bearing housing. Finally, install the upper bearing housing and tighten the connecting bolts between the bearing housings.

[0037] S6: Sealing: The type of sealing varies depending on the bearing structure and the requirements of the operating environment. Sealing is generally installed within the bearing housing; therefore, it is installed after the bearing housing is installed. For example, if a felt seal is used, it can be installed in the sealing groove before the bearing housing is installed.

[0038] S7: Install the bearing housing: Tighten the connecting bolts of the upper and lower bearing housings in sequence. At this point, the installation of the split bearing unit is complete.

[0039] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0040] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A split bearing unit, characterized in that: Includes split bearing housings, split bearing boxes, split cylindrical roller bearings, and connecting conversion parts (15). The split bearing housing includes an upper bearing housing (1) and a lower bearing housing (2), which are connected by connecting bolts to form a closed cavity; The split cylindrical roller bearing is mounted on the shaft (3) and disposed in the closed cavity; The split cylindrical roller bearing includes: Inner ring (9), the inner ring (9) is a split structure composed of two half inner rings; The clamping ring (10) includes a first clamping ring and a second clamping ring, which are respectively clamped in the clamping grooves of the two half inner rings, and the joint of the clamping ring is staggered from the joint of the inner ring by 90°. The cage (11) is a split structure composed of two half-cages; Roller (12), said roller (12) is disposed in the roller pocket of the retainer (11); The outer ring (13) is a split structure consisting of two half outer rings; The split bearing housing includes an upper bearing housing (4) and a lower bearing housing (5), which are fitted onto the outer periphery of the split bearing box; the outer diameter surface of the split bearing box is an outer spherical surface, and the inner diameter surface of the split bearing housing is an inner spherical surface that mates with the outer spherical surface. The bottom of the lower bearing seat (5) is provided with a conformal lightweight groove structure (16); the connecting end face of the lower bearing seat (5) is provided with a countersunk hole (6), and an elastic cylindrical pin (7) is installed in the countersunk hole (6) for positioning and anti-loosening when connected with the upper bearing seat (4). The bottom of the lower bearing housing (2) is provided with a temperature measuring threaded hole (8), which is a through hole and is located near the outer ring (13); one end of the connecting conversion component (15) is connected to the temperature measuring threaded hole (8), and the other end is used to connect to the temperature sensor.

2. The split bearing unit according to claim 1, characterized in that: The side of the split bearing housing is designed with an inclined angle structure. The top of the upper bearing housing (4) is the narrowest and the bottom of the lower bearing housing (5) is the widest, forming a tapered support structure that is narrow at the top and wide at the bottom. The inclination angle α of the inclined angle structure is controlled between 1° and 2°.

3. The split bearing unit according to claim 1, characterized in that: The upper half of the countersunk hole (6) is a smooth hole, and the lower half is a threaded hole. The elastic cylindrical pin (7) is installed in the smooth hole. The elastic cylindrical pin (7) is a cylindrical structure with one side opening. The opening form is a combination of trapezoidal sawtooth and straight opening. Its outer diameter in its natural state is larger than the size of the smooth hole of the countersunk hole (6). After installation, it is in a compressed and tensioned state. The elastic cylindrical pin (7) protrudes from the mounting plane of the lower bearing seat (5) and matches the corresponding countersunk hole of the upper bearing seat (4).

4. The split bearing unit according to claim 1, characterized in that: The lightweight groove structure (16) of the lower bearing housing (5) is located in its bottom load-bearing area and is grooved along the outer contour of the bearing housing.

5. The split bearing unit according to claim 1, characterized in that: The temperature measuring threaded hole (8) is located near the outer ring (13) of the bearing, with its inlet center slightly lower than the shaft height and pointing towards the inside of the bearing at a 20° elevation angle; one end of the connecting conversion part (15) is provided with an internal thread that mates with the temperature sensor, and the other end is provided with an external thread that mates with the temperature measuring threaded hole (8).

6. The split bearing unit according to claim 1, characterized in that: The two connecting ends of the lower bearing housing (5) extend radially outward to form a horizontal assembly surface, and each assembly surface is provided with a positioning bolt mounting hole (14); the non-load-bearing area outside the assembly surface is designed to reduce weight by conforming to the shape, forming an irregular outer contour.

7. The split bearing unit according to claim 1, characterized in that: The split bearing housing is provided with a sealing groove for installing seals.

8. The split bearing unit according to claim 1, characterized in that: The outer edge of the contact surface between the lower bearing seat (5) and the upper bearing seat (4) is provided with a small arc notch (19). The height of the small arc notch (19) is greater than the thickness of the flathead screwdriver, which is used to pry the upper bearing seat (4) and the lower bearing seat (5) apart by the screwdriver during disassembly.

9. The split bearing unit according to claim 1, characterized in that: The lower bearing housing (5) is provided with an inclined large arc surface (17) to facilitate the installation of the split bearing housing and the self-aligning function between the split bearing housing and the split bearing housing.

10. A method for installing split bearing units, characterized in that: The split bearing unit as described in any one of claims 1-7 includes the following steps: S1: Install the lower bearing housing: Install the lower bearing housing (5) to the machine body and perform initial positioning and fixing through the positioning bolt mounting holes (14) on its assembly surface; S2: Install the inner ring: Apply lubricating oil to the inner ring mounting section on the shaft (3), put the two half inner rings together and install them on the shaft, and adjust the gap between the mating surfaces to be uniform; S3: Install the clamping rings: Install the first and second clamping rings into the clamping grooves of the inner half of the ring, ensuring that the joint of the clamping rings is offset from the joint of the inner ring by 90°, and tighten the clamping ring connecting bolts. S4: Install the cage roller assembly: Apply grease to the cage (11) and roller (12), install the two half-cage roller assemblies on the inner ring, and connect the two half-cages into a whole by means of a coupling; S5: Install the outer ring and bearing housing: Install the two half outer rings (13) into the upper bearing housing (1) and the lower bearing housing (2) respectively. First, hoist the lower bearing housing assembly to the upper side of the split cylindrical roller bearing, then rotate it 180° to the working position, then install the upper bearing housing assembly and tighten the connecting bolts of the split bearing housing. S6: Sealing: Install a seal in the sealing groove of the split bearing housing; S7: Install the upper bearing housing: Place the upper bearing housing (4) onto the lower bearing housing (5), use the protruding elastic cylindrical pin (7) for positioning, and finally tighten the connecting bolts between the upper and lower bearing housings to complete the installation.

Images