Engine roller bearing tester shaft guiding sleeve device and sleeving method

Abstract

A shaft system guide assembly device and assembly method for an engine roller bearing tester. This invention relates to the field of bearing testing fixtures. Existing roller bearing tester shaft system assemblies lack dedicated guide fixtures, leading to misalignment of the inner and outer rings during hoisting and assembly, causing damage to the bearing raceways. This invention includes a main shaft, an auxiliary guide seat, and a guide rod. The guide rod slidably passes through the inner hole of the main shaft and has a mating surface with the main shaft and the guide seat. Positioning bolts are used to lock the axial displacement of the guide rod. The bearing outer ring is assembled in a bearing mounting seat and placed in the auxiliary guide seat. During assembly, the extended guide rod engages with the center hole of the auxiliary guide seat, achieving radial alignment between the bearing outer ring and the bearing inner ring on the main shaft. This invention adjusts the extension length of the guide rod according to the bearing specifications, adapting to hoisting and assembly conditions, preventing roller collisions with the raceways, reducing the scrapping of valuable test bearings, and is suitable for bearing assembly in aero-engine roller bearing testers.

Description

Technical Field

[0001] This invention relates to the field of bearing testing fixtures, specifically to a shaft system guide assembly device and assembly method for an engine roller bearing tester. Background Technology

[0002] Roller bearings for aero-engines require various performance tests to be conducted on a bearing testing machine. During the test, the inner ring of the bearing is mounted on the main shaft of the testing machine, while the outer ring is mounted inside a dedicated mounting bracket. These mounting brackets are quite heavy and require a crane for hoisting and positioning during assembly.

[0003] Currently, there is no specialized guiding fixture to assist in shaft assembly operations. The hoisting process is affected by factors such as crane operation and manual alignment, making it difficult to ensure that the inner and outer rings of the bearing remain strictly concentric. When the inner and outer rings are not concentric, the bearing raceway surface is easily damaged by the rollers, resulting in indentations, scratches, and other damage.

[0004] The bearing raceway is a critical working surface of the bearing. Once it is damaged by impact, the entire set of test bearings is scrapped and cannot be used for further testing. On the one hand, this wastes valuable test bearings and increases testing costs. On the other hand, if the impact damage is minor and is not detected in time after assembly, conducting bearing tests with damage will also cause distorted test data, making it impossible to accurately assess the true performance of the bearing. In severe cases, it can even cause the testing equipment to malfunction.

[0005] The assembly equipment and simple sleeve tooling on existing ordinary bearing production lines are designed for small bearings and fixed-position press-fit scenarios. They are not suitable for the large-component hoisting and assembly conditions on the testing site, and cannot solve the centering and guiding problem when hoisting and assembling large, heavy mounting seats. Summary of the Invention

[0006] To address the problem that existing roller bearing tester shaft system assembly lacks dedicated guiding fixtures, leading to misalignment of inner and outer rings during hoisting and assembly, and causing damage to the bearing raceway, this invention provides a shaft system guiding assembly device and assembly method for an engine roller bearing tester.

[0007] The technical solution of this invention is:

[0008] A shaft system guide assembly for an engine roller bearing tester includes a bearing, which includes an inner bearing ring and an outer bearing ring. The outer bearing ring is assembled inside a bearing mounting seat. The assembly also includes a main shaft for the aero-engine roller bearing tester, an auxiliary guide seat, a guide rod, and positioning bolts.

[0009] The main shaft has an inner hole along the axial position, and the guide rod can slide through the inner hole of the main shaft. The guide rod is provided with a guide rod mating surface with the main shaft and a guide rod mating surface with the guide seat. A set of positioning holes is provided on the guide rod at a position perpendicular to the axial direction. Positioning bolts are inserted into the positioning holes to lock the axial relative displacement between the guide rod and the main shaft.

[0010] The auxiliary guide seat is equipped with a bearing mounting seat. The center hole of the auxiliary guide seat and the guide rod and guide seat mating surface of the guide rod achieve guiding engagement. During the assembly operation, the guide rod and guide seat mating surface of the guide rod extends out of the end face of the main shaft. The guide rod provides radial centering guidance for the auxiliary guide seat, bearing mounting seat, and bearing outer ring, so that the bearing outer ring and the bearing inner ring assembled on the main shaft remain concentric, thus completing the bearing assembly.

[0011] Furthermore, the main shaft has a stepped shaft structure, and a bearing inner ring mounting part is provided at the end of the main shaft. The bearing inner ring is positioned and mounted on the outer circular surface of the bearing inner ring mounting part.

[0012] Furthermore, the guide rod and the main shaft mating surface are clearance-fitted with the inner wall of the main shaft inner hole, allowing the guide rod to slide axially along the main shaft inner hole, thereby adjusting the extension length of the guide rod.

[0013] Furthermore, the mating surface between the guide rod and the guide seat is an outer cylindrical guide surface, and the inner wall of the central hole of the auxiliary guide seat is a cylindrical guide hole. The mating surface between the guide rod and the guide seat and the central hole of the auxiliary guide seat adopt a clearance guide fit.

[0014] Furthermore, the auxiliary guide seat is provided with a stepped stop structure, and the outer circle of the bearing mounting seat matches the stepped stop of the auxiliary guide seat. After the bearing mounting seat is installed inside the auxiliary guide seat, radial positioning is achieved.

[0015] Furthermore, the positioning hole is a radial through hole, and the positioning bolt passes through the wall of the main shaft radially and is tightened or screwed into the positioning hole of the guide rod to restrict the axial movement of the guide rod.

[0016] Furthermore, the stepped stop of the auxiliary guide seat and the bearing mounting seat are in a transition or small clearance fit to ensure that the bearing mounting seat is radially positioned inside the auxiliary guide seat, and that the bearing mounting seat can be easily removed after assembly.

[0017] Furthermore, the shaft system guide sleeve device for the engine roller bearing tester includes the following steps:

[0018] Step 1: Assemble and fix the inner ring of the bearing to the inner ring mounting part of the spindle, assemble the outer ring of the bearing into the bearing mounting seat, and then install the bearing mounting seat into the auxiliary guide seat to complete the radial positioning.

[0019] Step 2: Insert the guide rod into the inner hole of the spindle from the tail end, move the guide rod axially so that the mating surface of the guide rod and the guide seat extends out of the spindle end face to the preset guide length, and tighten the positioning bolt to fix the axial position of the guide rod;

[0020] Step 3: Hoist the auxiliary guide seat and bearing mounting seat assembly, align the auxiliary guide seat with the guide rod, and insert the guide rod into the center hole of the auxiliary guide seat to achieve radial centering; move the auxiliary guide seat axially, and the outer ring of the bearing will follow the auxiliary guide seat to move towards the inner ring of the bearing, completing the fitting of the inner and outer rings of the bearing;

[0021] Step 4: After the assembly is complete, remove the positioning bolts, pull out the guide rod, remove the auxiliary guide seat, and complete the bearing assembly.

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

[0023] This invention provides a lifting and assembly guide structure that uses a guide rod inserted through the inner hole of the main shaft in conjunction with an auxiliary guide seat. This is particularly useful in special working conditions where bearing mounting seats are heavy and require crane lifting for placement in bearing testing equipment. During assembly, the guide rod extends from the end face of the main shaft and first mates with the center hole of the auxiliary guide seat to achieve radial alignment. The bearing outer ring and bearing mounting seat are pre-positioned radially within the auxiliary guide seat. Throughout the assembly process, the radial position of the outer ring is constrained, ensuring that the bearing outer ring remains coaxial with the bearing inner ring already positioned on the main shaft. This eliminates the problem of misalignment during lifting, prevents rollers from colliding and damaging the bearing raceway, reduces the probability of bearing failure, and ensures the accuracy of bearing test data and the safe operation of the testing equipment.

[0024] This invention features a guide rod whose extension length can be adjusted axially within the spindle bore. It is locked in place by a radially locking positioning bolt. Simultaneously, the auxiliary guide seat utilizes a stepped stop to achieve rapid radial positioning of the bearing mounting seat. The tooling is simple to assemble and disassemble, adaptable to on-site testing and assembly conditions. The guide rod's extension length can be flexibly adjusted according to the size and assembly stroke of different roller bearing models, meeting the assembly requirements of various bearing specifications. During assembly, the bearing mounting seat can be directly inserted into the auxiliary guide seat to complete the pre-positioning, eliminating the need for additional complex alignment operations and reducing the difficulty of alignment during hoisting. After assembly, simply loosen the positioning bolt to remove the guide rod and take off the auxiliary guide seat; tooling disassembly will not interfere with the already assembled bearing assembly. Unlike fixed press-fit assembly equipment on production lines, this tooling requires no modification to the testing equipment body, is easy to assemble and disassemble on-site, does not occupy a fixed workstation, and is well-suited for large-component hoisting and assembly conditions on-site, improving the efficiency of bearing assembly operations. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 yes Figure 1AA section view;

[0027] Figure 3 yes Figure 2 A magnified view of part B in the image;

[0028] Figure 4 This is a schematic diagram of the structure of the present invention during assembly.

[0029] Figure 5 This is a schematic diagram of the installation structure of the auxiliary guide seat and the bearing mounting seat;

[0030] Figure 6 This is a schematic diagram of the installation structure between the spindle and the inner ring of the bearing;

[0031] Figure 7 yes Figure 6 A schematic diagram of the structure without the inner ring of the bearing installed.

[0032] Figure 8 This is a structural diagram of the guide rod;

[0033] In the diagram: 1. Main spindle, 2. Auxiliary guide seat, 3. Bearing mounting seat, 4. Guide rod, 5. Bearing outer ring, 6. Bearing inner ring, 7. Positioning bolt, 8. Positioning hole, 9. Main spindle inner hole, 10. Bearing inner ring mounting part, 11. Mating surface between guide rod and guide seat, 12. Mating surface between guide rod and main spindle. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Specific implementation method one:

[0036] Combination Figure 1 — Figure 8 This embodiment describes a shaft system guide assembly for an engine roller bearing tester. The assembly includes a bearing, which includes an inner bearing ring 6 and an outer bearing ring 5. The outer bearing ring 5 is assembled inside a bearing mounting seat 3. The assembly also includes a main shaft 1 for the aero-engine roller bearing tester, an auxiliary guide seat 2, a guide rod 4, and positioning bolts 7.

[0037] The main shaft 1 has an inner hole 9 along the axial direction. The guide rod 4 can be slidably installed inside the inner hole 9. The guide rod 4 is provided with a guide rod mating surface 12 and a guide rod mating surface 11. A set of positioning holes 8 perpendicular to the axial direction are opened on the guide rod 4. The positioning bolt 7 is assembled and inserted into the positioning holes 8 to lock the axial relative displacement between the guide rod 4 and the main shaft 1.

[0038] The auxiliary guide seat 2 is used to install the bearing mounting seat 3. The center hole of the auxiliary guide seat 2 and the guide rod of the guide rod 4 form a guiding fit with the guide seat mating surface 11.

[0039] During the assembly operation, the guide rod 4 extends beyond the end face of the main shaft 1 through the guide rod mating surface 11 with the guide seat. The guide rod 4 provides radial alignment guidance for the auxiliary guide seat 2, bearing mounting seat 3, and bearing outer ring 5, ensuring that the bearing outer ring 5 and the bearing inner ring 6 assembled on the main shaft 1 remain coaxial and concentric, thus completing the assembly operation of the roller bearing. For the large-component hoisting and assembly conditions at the test site, the guide rod 4 provides radial guidance during the hoisting process, overcoming the misalignment problems caused by crane hoisting and manual alignment, preventing the rollers from colliding with the bearing raceway during the assembly process, and preventing indentations, scratches, and damage to the bearing. Specific Implementation Method Two:

[0041] Combination Figure 1 — Figure 8 This embodiment describes a shaft system guide sleeve device for an engine roller bearing tester. The main shaft 1 has a stepped shaft structure, and a bearing inner ring mounting part 10 is provided at the end of the main shaft 1. The bearing inner ring 6 is positioned and mounted on the outer circular surface of the bearing inner ring mounting part 10.

[0042] The bearing inner ring mounting part 10 serves as the positioning reference surface for the bearing inner ring 6, ensuring that the bearing inner ring 6 maintains a high degree of coaxiality with the spindle 1 after assembly. The spindle adopts a stepped shaft structure, which can achieve axial positioning. During assembly, the bearing inner ring 6 can be axially positioned against the spindle, eliminating the installation gap of the bearing inner ring 6, providing a reliable inner ring reference for subsequent assembly, and preventing radial displacement of the inner ring. Specific implementation method three:

[0044] Combination Figure 1 — Figure 8 This embodiment describes a shaft guide sleeve device for an engine roller bearing tester. The guide rod and the main shaft mating surface 12 are clearance-fitted with the inner wall of the main shaft inner hole 9. The guide rod 4 can slide axially along the main shaft inner hole 9 to adjust the extension length of the guide rod 4.

[0045] During on-site assembly, the length of the guide rod 4 extending outward can be adjusted according to the bearing specifications and assembly stroke. This ensures sufficient guiding distance to meet the hoisting and alignment requirements, while also preventing interference and collisions caused by excessively extended guide rods. This method is suitable for assembling different models of engine roller bearings. Specific implementation method four:

[0047] Combination Figure 1 — Figure 8This embodiment describes a shaft guide sleeve device for an engine roller bearing tester. The guide rod and guide seat mating surface 11 is an outer cylindrical guide surface, and the inner wall of the center hole of the auxiliary guide seat 2 is a cylindrical guide hole. The guide rod and guide seat mating surface 11 and the center hole of the auxiliary guide seat 2 adopt a clearance guide fit.

[0048] Cylindrical guides can achieve full-circumferential radial limiting. During hoisting operations, the auxiliary guide seat 2 slides smoothly along the outer wall of the guide rod 4, limiting the radial displacement of the bearing mounting seat 3 and the outer ring 5 of the bearing, ensuring that the inner and outer rings of the bearing are coaxial throughout the entire assembly process. The clearance fit ensures smooth guidance and avoids jamming, making it easy to introduce and assemble during hoisting. Specific implementation method five:

[0050] Combination Figure 1 — Figure 8 This embodiment describes a shaft guide assembly device for an engine roller bearing tester. The auxiliary guide seat 2 is provided with a stepped stop structure. The outer circle of the bearing mounting seat 3 matches the stepped stop of the auxiliary guide seat 2. The bearing mounting seat 3 is installed inside the auxiliary guide seat 2 to achieve radial positioning.

[0051] The bearing mounting seat 3 is hoisted and placed inside the auxiliary guide seat 2. The stepped stop provides radial constraint to the bearing mounting seat 3, ensuring that the bearing mounting seat 3 and the outer ring 5 of the bearing are pre-coaxial with the auxiliary guide seat 2. Subsequently, only the guide rod and the auxiliary guide seat 2 need to be aligned, eliminating the need to separately align the bearing mounting seat, thus reducing the workload of on-site hoisting and alignment. Specific implementation method six:

[0053] Combination Figure 1 — Figure 8 This embodiment describes a shaft system guide sleeve device for an engine roller bearing tester. The positioning hole 8 is a radial through hole. The positioning bolt 7 penetrates the wall of the main shaft 1 radially and is tightened or screwed into the positioning hole 8 of the guide rod 4 to restrict the axial movement of the guide rod 4.

[0054] After the guide rod 4 is adjusted to the appropriate extension length, the positioning bolt 7 is tightened. The positioning bolt 7 forms an axial lock on the guide rod 4. During the hoisting process, the guide rod 4 bears the axial thrust and will not retract or shift, ensuring the stability of the guide rod extension length, ensuring the continuous effectiveness of the guiding process, and avoiding guidance failure due to guide rod retraction. Specific implementation method seven:

[0056] Combination Figure 1 — Figure 8This embodiment describes a shaft system guide assembly device for an engine roller bearing tester. The stepped stop of the auxiliary guide seat 2 and the bearing mounting seat 3 are in transition or small clearance fit to ensure that the bearing mounting seat 3 is radially positioned inside the auxiliary guide seat 2, and that the bearing mounting seat 3 can be easily removed after assembly.

[0057] This fit ensures reliable radial positioning of the bearing mounting seat 3 after it is installed inside the auxiliary guide seat 2, controlling the radial runout of the bearing mounting seat 3. On the other hand, after the bearing is assembled, the bearing mounting seat 3 can be smoothly removed from the auxiliary guide seat 2 without locking or jamming, facilitating tooling disassembly and improving on-site disassembly and assembly efficiency. Detailed implementation method eight:

[0059] Combination Figure 1 — Figure 8 This embodiment describes a shaft system guide sleeve device for an engine roller bearing tester. The method includes the following steps:

[0060] Step 1: Assemble and fix the inner ring 6 of the bearing onto the inner ring mounting part 10 of the main shaft 1; assemble the outer ring 5 of the bearing into the bearing mounting seat 3, and then install the bearing mounting seat 3 into the auxiliary guide seat 2, relying on the stepped stop to complete the radial positioning of the bearing mounting seat 3.

[0061] Step 2: Insert the guide rod 4 into the inner hole 9 of the main shaft 1 from the tail end, and move the guide rod 4 axially so that the guide rod and the guide seat mating surface 11 extend out of the end face of the main shaft 1 to reach the preset guide length; then tighten the positioning bolt 7 to fix the axial position of the guide rod 4 and prevent the guide rod 4 from moving.

[0062] Step 3: Use a crane to lift the auxiliary guide seat 2 together with the bearing mounting seat 3 as a whole assembly, so that the center hole of the auxiliary guide seat 2 is aligned with the guide rod 4, and the guide rod 4 is inserted into the center hole of the auxiliary guide seat 2 to complete the radial alignment; continue to move the auxiliary guide seat 2 axially, and the outer ring 5 of the bearing follows the auxiliary guide seat 2 to move towards the inner ring 6 of the bearing until the inner and outer rings of the bearing are fitted together.

[0063] Step 4: After the bearing assembly is completed, remove the positioning bolt 7, pull the guide rod 4 out from the inner hole 9 of the main shaft, and then remove the auxiliary guide seat 2 to complete the assembly of the entire test bearing.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A shaft guide assembly for an engine roller bearing tester, comprising a bearing, the bearing including an inner ring (6) and an outer ring (5), the outer ring (5) being assembled inside a bearing mounting base (3), characterized in that, It also includes a spindle (1), an auxiliary guide seat (2), a guide rod (4), and a positioning bolt (7) for an aero-engine roller bearing tester; The main shaft (1) has an inner hole (9) along the axial position. The guide rod (4) can slide through the inner hole (9). The guide rod (4) is provided with a guide rod mating surface (12) and a guide rod mating surface (11). A set of positioning holes (8) are provided at intervals along the vertical direction of the guide rod (4). The positioning bolt (7) is inserted into the positioning hole (8) to lock the axial relative displacement between the guide rod (4) and the main shaft (1). The auxiliary guide seat (2) is equipped with a bearing mounting seat (3). The center hole of the auxiliary guide seat (2) and the guide rod of the guide rod (4) and the guide seat mating surface (11) achieve guiding engagement. During the assembly operation, the guide rod of the guide rod (4) and the guide seat mating surface (11) extend out of the end face of the main shaft (1). The guide rod (4) provides radial centering guidance for the auxiliary guide seat (2), the bearing mounting seat (3), and the outer ring of the bearing (5), so that the outer ring of the bearing (5) and the inner ring of the bearing (6) assembled on the main shaft (1) remain concentric, thus completing the bearing assembly.

2. The shaft guide sleeve device for the engine roller bearing tester according to claim 1, characterized in that, The main shaft (1) has a stepped shaft structure, and the end of the main shaft (1) is provided with a bearing inner ring mounting part (10), and the bearing inner ring (6) is positioned and installed on the outer circular surface of the bearing inner ring mounting part (10).

3. The shaft guide sleeve device for the engine roller bearing tester according to claim 1, characterized in that, The guide rod and the main shaft mating surface (12) are in clearance fit with the inner wall of the main shaft inner hole (9), and the guide rod (4) can slide axially along the main shaft inner hole (9) to realize the adjustment of the extension length of the guide rod (4).

4. The shaft guide sleeve device for the engine roller bearing tester according to claim 1, characterized in that, The guide rod and guide seat mating surface (11) is an outer cylindrical guide surface, and the inner wall of the center hole of the auxiliary guide seat (2) is a cylindrical guide hole. The guide rod and guide seat mating surface (11) and the center hole of the auxiliary guide seat (2) adopt a clearance guide fit.

5. The shaft guide sleeve device for the engine roller bearing tester according to claim 1, characterized in that, The auxiliary guide seat (2) is provided with a stepped stop structure. The outer circle of the bearing mounting seat (3) matches the stepped stop of the auxiliary guide seat (2). The bearing mounting seat (3) is installed inside the auxiliary guide seat (2) to achieve radial positioning.

6. The shaft guide sleeve device for the engine roller bearing tester according to claim 1, characterized in that, The positioning hole (8) is a radial through hole. The positioning bolt (7) passes through the wall of the main shaft (1) radially and is tightened or screwed into the positioning hole (8) of the guide rod (4) to restrict the axial movement of the guide rod (4).

7. The shaft guide sleeve device for the engine roller bearing tester according to claim 5, characterized in that, The stepped stop of the auxiliary guide seat (2) and the bearing mounting seat (3) are in transition or small clearance fit to ensure that the bearing mounting seat (3) is radially positioned inside the auxiliary guide seat (2) and that the bearing mounting seat (3) can be smoothly removed after the assembly is completed.

8. A method for assembling the shaft system guide sleeve device of an engine roller bearing tester as described in any one of claims 1-7, characterized in that, The method includes the following steps: Step 1: Assemble and fix the inner ring (6) of the bearing to the inner ring mounting part (10) of the main shaft (1), assemble the outer ring (5) of the bearing to the inside of the bearing mounting seat (3), and then install the bearing mounting seat (3) into the inside of the auxiliary guide seat (2) to complete the radial positioning. Step 2: Insert the guide rod (4) into the inner hole (9) of the main shaft (1) from the tail end, move the guide rod (4) axially so that the guide rod and the guide seat mating surface (11) extend out of the end face of the main shaft (1) to the preset guide length, and tighten the positioning bolt (7) to fix the axial position of the guide rod (4); Step 3: Hoist the auxiliary guide seat (2) and bearing mounting seat (3) assembly, align the auxiliary guide seat (2) with the guide rod (4), insert the guide rod (4) into the center hole of the auxiliary guide seat (2) to achieve radial centering; move the auxiliary guide seat (2) axially, and the outer ring (5) of the bearing follows the auxiliary guide seat (2) to move towards the inner ring (6) of the bearing, completing the fitting of the inner and outer rings of the bearing; Step 4: After the assembly is completed, remove the positioning bolt (7), pull out the guide rod (4), remove the auxiliary guide seat (2), and complete the bearing assembly.

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