A bearing disassembly aid

Abstract

The utility model provides a kind of bearing disassembly auxiliary device, including the shell being set to transmission shaft outside, shell and transmission shaft are sequentially equipped with framework oil seal, bearing washer and tapered roller bearing;Right end surface T2 of the bearing washer is equipped with step hole E, left end surface T1 is equipped with taper angle C;The center of the bearing washer is equipped with inner hole B, and the bottom surface T3 of step hole E is equipped with oil hole one K1 and oil hole two K2 between left end surface T1 of bearing washer;Shell is equipped with bearing hole b in, and the root of bearing hole b is equipped with fillet, and the side of bearing hole b is equipped with the matching hole of shell and framework oil seal;The outer ring of the tapered roller bearing is contacted with bearing hole b, and the inner ring is contacted with transmission shaft.The utility model can conveniently disassemble tapered roller bearing outer ring, and does not increase the cost of axial plunger hydraulic pump, reduces the cost of shell scrap due to tapered roller bearing damage and tapered roller bearing outer ring disassembly in maintenance process, improves the market competitiveness of product.

Description

Technical Field

[0001] This utility model relates to a bearing disassembly auxiliary device, belonging to the technical field of axial piston hydraulic pumps. Background Technology

[0002] Through-shaft axial piston hydraulic pumps have advantages such as compact structure, small radial dimensions, light weight, small size, low rotational inertia, easy variable displacement, and automatic flow adjustment in multiple ways. They can operate at high speeds and pressures and are widely used in various fields such as engineering machinery, hoisting and transportation, metallurgy, aviation, weaponry, and shipbuilding. A through-shaft axial piston hydraulic pumps generally consist of components such as a housing, drive shaft, cylinder block, distributor plate, piston, swashplate, and oil seal.

[0003] The drive shaft of a through-shaft axial piston hydraulic pump (hereinafter referred to as an axial piston hydraulic pump) passes through the cylinder block and swashplate, and both ends of the shaft are supported by tapered roller bearings. Tapered roller bearings consist of an outer ring, rollers, an inner ring, and a cage. Due to their compact structure, low frictional resistance, and high efficiency, they are widely used standard components in axial piston hydraulic pumps. Specifically, the outer ring of the tapered roller bearing is precisely fitted to the bearing bore in the housing, and the inner ring of the tapered roller bearing is precisely fitted to the outer circle of the drive shaft. However, the quality of the assembly and disassembly of the tapered roller bearings directly affects the lifespan of the axial piston hydraulic pump.

[0004] During the maintenance of a certain type of axial piston hydraulic pump, there is a problem with the difficulty in disassembling the outer ring of the tapered roller bearing. If the tapered roller bearing is damaged, the housing becomes unusable, resulting in significant waste and extremely high costs. The traditional solution is to increase the outer diameter of the oil seal skeleton, i.e., increase the diameter of the hole that mates with the outer diameter of the oil seal skeleton, thus providing space to press the outer ring of the tapered roller bearing. However, oil seal skeletons are generally standard parts, and dimensional mismatches necessitate mold making, which is extremely expensive. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a bearing disassembly auxiliary device, which can not only facilitate the disassembly of the outer ring of tapered roller bearings, but also improve the maintenance efficiency of axial piston hydraulic pumps and reduce maintenance costs.

[0006] This utility model is achieved through the following technical solution.

[0007] This utility model provides a bearing disassembly auxiliary device, comprising a housing disposed outside a drive shaft, with a skeleton oil seal, a bearing washer, and a tapered roller bearing sequentially disposed between the housing and the drive shaft; the right end face T2 of the bearing washer has a stepped hole E, and the left end face T1 has a cone angle C; the center of the bearing washer has an inner hole B, and the bottom surface T3 of the stepped hole E and the left end face T1 of the bearing washer have an oil passage hole K1 and an oil passage hole K2; the housing has a bearing hole b, the root of the bearing hole b has a rounded corner, and one side of the bearing hole b has a mating hole for the housing and the skeleton oil seal; the outer ring of the tapered roller bearing contacts the bearing hole b, and the inner ring contacts the drive shaft.

[0008] The beneficial effects of this utility model are: it can facilitate the disassembly of the outer ring of the tapered roller bearing without increasing the cost of the axial piston hydraulic pump, reduce the cost of scrapping the housing caused by damage to the tapered roller bearing and disassembly of the outer ring during maintenance, and improve the market competitiveness of the product. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 A cross-sectional view of the bearing washer; In the diagram: 1-drive shaft, 2-housing, 3-skeletal oil seal, 4-bearing washer, 5-tapered roller bearing, 5.1-outer ring, 5.2-inner ring, a-outer circle of drive shaft, b-bearing bore, A-outer circle of bearing washer, B-inner hole, C-cone angle, E-stepped hole, T1-left end face, K1-oil hole one, K2-oil hole two, T2-right end face, T3-bottom face, D-diameter of the large cone end of the outer ring of tapered roller bearing, D1-diameter of stepped hole, D2-diameter of inner hole, D3-diameter of mating hole of housing skeleton oil seal. Detailed Implementation

[0010] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0011] like Figure 1 and 2 As shown, the bearing washer 4 has an outer circle A that mates with the bearing hole b (major diameter centering) for positioning the bearing washer 4; the left end face T1 of the bearing washer 4 contacts the bottom surface of the bearing hole b for axial positioning of the bearing washer 4; the right end face T2 of the bearing washer 4 contacts the large tapered end face of the outer ring 5.1 of the tapered roller bearing 5 for axial positioning of the bearing washer 4.

[0012] Furthermore, a stepped hole E is provided at the middle position of the right end face T2. The diameter D1 of the stepped hole E is larger than the large tapered end diameter D of the outer ring 5.1 of the tapered roller bearing 5. Oil passage hole one K1 and oil passage hole two K2 are provided between the bottom surface T3 of the stepped hole E and the left end face T1.

[0013] Furthermore, a tapered angle C is provided between the outer circle A of the bearing washer and the left end face T1. The angle of the tapered angle C is greater than the rounded corner at the root of the bearing hole b, which facilitates the assembly of the bearing washer 4. The bearing washer 4 has an inner hole B at its center. The inner hole B is a through hole. The inner diameter D2 of the inner hole B is smaller than the outer diameter of the skeleton oil seal 3, but larger than the diameter of the outer circle a of the drive shaft, which facilitates the assembly of the bearing washer 4 along the drive shaft 1.

[0014] Preferably, the inner hole B is connected to the stepped hole E.

[0015] The working principle of this utility model is as follows: The working states of each component when the axial piston hydraulic pump is working are as follows: Figure 1 As shown, during maintenance, the skeleton oil seal 3 is removed. Since the drive shaft 1 and the inner ring 5.2 are interference fit, the drive shaft 1, the inner ring 5.2, the cage, and the rollers are removed together. The bearing washer 4 is pressed from the left end with a sleeve. In this way, the pressure is transmitted through the bearing washer 4 to the large tapered end face of the outer ring 5.1. When the pressure is greater than the static friction between the outer ring 5.1 and the bearing hole b, the pressure pushes the bearing washer 4 and then pushes the outer ring 5.1 to the right, finally disassembling the outer ring 5.1 from the bearing hole b.

[0016] During the disassembly process of the outer ring 5.1, the entire axial circumference of the outer ring 5.1 is subjected to force, and the force is uniform. Therefore, the outer ring 5.1 is not deformed, and the bearing hole b is also not deformed. Secondly, the process reduces the scrapping of the housing 2 caused by the inconvenience of disassembling the outer ring 5.1, reduces maintenance costs, and improves the market competitiveness of the product.

[0017] In summary, the advantages of this utility model are as follows: 1. Increase the depth of the bearing hole b on the housing 2 of the axial piston hydraulic pump, and add a bearing washer 4 between the housing 2 and the tapered roller bearing 5. The outer circle of the left end face T1 of the bearing washer 4 is provided with a cone angle C, which facilitates the assembly of the bearing washer 4. When machining the bearing hole b, the fit tolerance and surface roughness of the bearing hole b only need to be guaranteed within a certain depth range, without having to guarantee it to the bottom of the hole, thereby reducing the machining cost of the bearing hole b.

[0018] 2. The stepped hole diameter D1 of the bearing washer 4 is larger than the large tapered end diameter D of the outer ring of the tapered roller bearing, so that the cage and rollers of the tapered roller bearing 5 are fully immersed in hydraulic oil, which facilitates the flow of hydraulic oil and thus facilitates the heat dissipation of the tapered roller bearing 5.

[0019] 3. The inner diameter D2 of the bearing washer 4 is smaller than the diameter D3 of the oil seal mating hole of the housing skeleton, which makes it easier for the sleeve to press on the left end face T1 of the bearing washer 4, and facilitates the disassembly of the outer ring 5.1 of the tapered roller bearing 5, thus improving maintenance efficiency.

[0020] 4. During maintenance, remove the skeleton oil seal 3, and remove the drive shaft 1 together with the inner ring 5.1 of the tapered roller bearing 5, as well as the cage and rollers. Use a sleeve to press the bearing washer 4 from the shaft extension end to facilitate the disassembly of the outer ring 5.1.

Claims

1. A bearing disassembly auxiliary device, comprising a housing (2) disposed outside a transmission shaft (1), characterized in that: Between the housing (2) and the drive shaft (1), a skeleton oil seal (3), a bearing washer (4), and a tapered roller bearing (5) are arranged in sequence; the right end face T2 of the bearing washer (4) is provided with a stepped hole E, and the left end face T1 is provided with a cone angle C; the center of the bearing washer (4) is provided with an inner hole B, and the bottom surface T3 of the stepped hole E and the left end face T1 of the bearing washer (4) are provided with an oil passage hole K1 and an oil passage hole K2; the housing (2) is provided with a bearing hole b, the root of the bearing hole b is provided with a rounded corner, and one side of the bearing hole b is provided with a mating hole between the housing (2) and the skeleton oil seal (3); the outer ring (5.1) of the tapered roller bearing (5) is in contact with the bearing hole b, and the inner ring (5.2) is in contact with the drive shaft (1).

2. The bearing disassembly auxiliary device as described in claim 1, characterized in that: The bearing washer (4) and tapered roller bearing (5) are installed in the bearing hole b, and the skeleton oil seal (3) is installed in the mating hole.

3. The bearing disassembly auxiliary device as described in claim 1, characterized in that: The left end face T1 of the bearing washer (4) is in contact with the bottom surface of the bearing hole b, and the right end face T2 of the bearing washer (4) is in contact with the large tapered end face of the outer ring (5.1).

4. The bearing disassembly auxiliary device as described in claim 1, characterized in that: The stepped hole diameter D1 of the stepped hole E is greater than the inner hole diameter D of the outer ring (5.1).

5. The bearing disassembly auxiliary device as described in claim 1, characterized in that: The inner diameter D2 of the inner hole B is greater than the outer circle a of the transmission shaft (1) and smaller than the diameter D3 of the oil seal mating hole of the housing skeleton.

6. The bearing disassembly auxiliary device as described in claim 1, characterized in that: The outer circle A of the bearing washer (4) and the bearing hole b are fitted with a large diameter centering fit.

7. The bearing disassembly auxiliary device as described in claim 1, characterized in that: The cone angle C is greater than the rounded corner at the root of the bearing hole b.

8. The bearing disassembly auxiliary device as described in claim 1, characterized in that: The inner hole B is a through hole, and the inner hole B communicates with the stepped hole E.

9. The bearing disassembly auxiliary device as described in claim 1, characterized in that: The drive shaft (1) and the inner ring (5.2) are interference fit.

10. The bearing disassembly auxiliary device as described in any one of claims 1 to 9, characterized in that: The diameter of the stepped bore D1 is greater than the diameter of the outer ring of the tapered roller bearing D, which is greater than the inner diameter D2, which is greater than the outer diameter a of the drive shaft. The inner diameter D2 is less than the diameter of the oil seal mating hole in the housing skeleton.

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