Assembling tool for interference mounting of bearing

Abstract

The utility model relates to the technical field of engine bearing assembly, in particular to an assembly tool for interference installation of a bearing, which is used for interference installation of a bearing inner ring and a balance shaft and comprises a shaft sleeve A and a shaft sleeve B. The two ends of the shaft sleeve A and the shaft sleeve B are provided with installation lugs, the middle portions of the shaft sleeve A and the shaft sleeve B are of semicircular structures, and a cylindrical cavity is formed after the shaft sleeve A and the shaft sleeve B are buckled. Connecting holes are correspondingly formed in the mounting lugs, and the shaft sleeve A and the shaft sleeve B are connected and locked through fasteners; and the lower end surfaces of the shaft sleeve A and the shaft sleeve B are force application surfaces for the upper end surface of the bearing inner ring. The device is suitable for interference installation of various bearings, it is guaranteed that the inner ring and the outer ring of the bearing are evenly stressed at the same time, and local stress concentration, bearing scratching or journal damage caused by manual operation deflection are avoided; positioning and press-fitting processes are simplified, manual adjustment and knocking operation are reduced, and the device is suitable for batch parts; when the tool is used for assembling the bearing, the bearing is effectively prevented from falling off in the assembling process, and the installation firmness is improved.

Description

Technical Field

[0001] This utility model relates to the field of engine bearing assembly technology, specifically to an assembly tool for interference fit bearings. Background Technology

[0002] As the "joints" of an aero-engine, the aero-engine bearing serves as the "medium" between the rotor and the engine casing. It mainly consists of four parts: an inner ring, an outer ring, a cage, and balls (rollers). The inner ring is connected to the rotor, while the outer ring is fixed to the engine bearing housing. The inner and outer rings are connected by balls (rollers). Aero-engines can reach speeds of up to 18,000 revolutions per minute. Such high speeds mean that the bearings must withstand enormous centrifugal forces, requiring stricter dimensional and geometric tolerances during bearing installation. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides an assembly tool for interference fit bearings.

[0004] The specific technical solution is as follows:

[0005] An assembly tool for interference fit bearings is provided for interference fit of the bearing inner ring and balance shaft. The assembly tool includes bushing A and bushing B, both bushing A and bushing B have mounting ears at both ends and a semi-circular structure in the middle. When fastened together, they form a cylindrical cavity. Corresponding connecting holes are provided on the mounting ears. Bushing A and bushing B are connected and locked by fasteners. The lower end face of bushing A and bushing B is the force application surface for the upper end face of the bearing inner ring.

[0006] The mounting lug has a positioning hole, and the bushing A and bushing B are circumferentially positioned by a positioning pin.

[0007] The nominal size of the inner bore of the cylindrical cavity is greater than the maximum outer diameter of the balance shaft.

[0008] The fasteners include hex socket screws and hex nuts, with washers added to the hex socket screws.

[0009] The assembly tool is suitable for interference fit installation of both one-piece and split bearings.

[0010] The bearing is subjected to thermal expansion and contraction using a hot-cold fitting method before assembly.

[0011] Compared with the prior art, the present invention has the following beneficial technical effects:

[0012] This utility model is applicable to interference fit of integrated bearings and split bearings, ensuring that the inner and outer rings of the bearing are subjected to uniform force simultaneously, avoiding local stress concentration, bearing scratches or journal damage caused by manual operation and misalignment; it simplifies the positioning and pressing process, reduces manual adjustment and hammering operations, and is suitable for batch parts; when assembling bearings with this tool, it effectively prevents the bearings from falling off during the assembly process, increasing the stability of the installation. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the assembly tool of this utility model;

[0014] Figure 2 This is a front view of the assembly tool of this utility model;

[0015] Figure 3 for Figure 2 A sectional view of the plane containing AA;

[0016] Figure 4 This is a schematic diagram of the planar structure of the assembly tool of this utility model;

[0017] In the diagram, 1. Bushing A; 2. Bushing B; 3. Locating pin; 4. Socket head screw; 5. Washer; 6. Hex nut; 7. Balance shaft; 8. Bearing inner ring. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings, but the scope of protection of the present invention is not limited by the accompanying drawings.

[0019] Figure 1 This is a three-dimensional structural diagram of the assembly tool of this utility model. Figure 2 This is the front view of the assembly tool of this utility model. Figure 3 for Figure 2 A sectional view of the plane containing AA. Figure 4 The figure shows a schematic diagram of the planar structure of the assembly tool of this utility model:

[0020] This utility model relates to an assembly tool for interference fit bearings, used for interference fit installation of the bearing inner ring 8 and the balance shaft 7. The assembly tool includes bushing A1 and bushing B2, both bushing A1 and bushing B2 having mounting ears at both ends and a semi-circular structure in the middle, forming a cylindrical cavity after fastening. The nominal size of the inner hole of the cylindrical cavity is larger than the maximum outer diameter of the balance shaft. A gap is left to facilitate the insertion of the balance shaft and pressing into the bearing inner ring. During the assembly process, the dynamics of the bearing inner ring can be observed in real time through the gap and adjustments can be made in a timely manner. Corresponding connecting holes are provided on the mounting ears, and bushing A1 and bushing B2 are connected and locked by fasteners, including hexagonal socket screws 4 and hexagonal nuts 6, with washers 5 added to the hexagonal socket screws 4. Positioning holes are also provided on the mounting ears, and circumferential positioning of bushing A1 and bushing B2 is achieved by positioning pins 3. To prevent circumferential misalignment of the bushings during tightening and to ensure uniform contact during press fitting; the lower end faces of bushings A1 and B2 are the force-applying surfaces for the upper end face of the inner ring 8 of the bearing.

[0021] The above-mentioned assembly tools are suitable for interference fit of integral bearings and split bearings, and the bearings are subjected to thermal expansion and contraction using cold and hot fitting before assembly.

[0022] During installation, first align the inner groove of the bearing inner ring 8 with the balance shaft 7 to be connected, allowing the balance shaft 7 to pass through the inner groove of the bearing inner ring. Then, pre-tighten the bushings A1 and B2 using the hex socket screws 4 and hex nuts 6, pre-installing them onto the balance shaft 7. Monitor the dynamics of the bearing inner ring 8 in real time through the gap between the separate bushings A1 and B2, adjusting as needed. Tighten the hex socket screws 4 and hex nuts 6, then slide the locked bushings A1 and B2 up and down to evenly apply force to the lower end faces of the bushings A1 and B2 on the upper end face of the bearing inner ring 8, completing the interference fit. Finally, use a feeler gauge to check the gap between the bearing inner ring and the balance disc at the installation point. Select the appropriate feeler gauge according to the assembly requirements. If the feeler gauge cannot be inserted, it indicates that the bearing inner ring has been installed correctly.

Claims

1. An assembly tool for an interference fit bearing, characterized in that: For interference fitting of bearing inner ring and balance shaft, the assembly tool includes bushing A and bushing B. Bushing A and bushing B have mounting ears at both ends and a semi-circular structure in the middle. After fastening, they form a cylindrical cavity. Corresponding connecting holes are opened on the mounting ears. Bushing A and bushing B are connected and locked by fasteners. The lower end face of bushing A and bushing B is the force-applying surface for the upper end face of bearing inner ring.

2. The assembly tool for the interference fit bearing according to claim 1, characterized in that: The mounting lug has a positioning hole, and the bushing A and bushing B are circumferentially positioned by a positioning pin.

3. The assembly tool for the interference fit bearing according to claim 1, characterized in that: The nominal size of the inner bore of the cylindrical cavity is greater than the maximum outer diameter of the balance shaft.

4. The assembly tool for the interference fit bearing according to claim 1, characterized in that: The fasteners include hex socket screws and hex nuts, with washers added to the hex socket screws.

5. The assembly tool for the interference fit bearing according to claim 1, characterized in that: The assembly tool is suitable for interference fit installation of both one-piece and split bearings.

6. The assembly tool for the interference fit bearing according to claim 1, characterized in that: The bearing is subjected to thermal expansion and contraction using a hot-cold fitting method before assembly.

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