22. At the threaded portion 21, the outer circumferential surface of the inner sleeve 2 is formed with an external thread for threaded connection with the supporting ring 3. At the tapered portion 22, the outer circumferential surface of the inner sleeve 2 forms a second conical surface 2s2 that extends to the other axial end of the inner sleeve 2 (the tapered portion or the end of the inner sleeve 2 away from the threaded portion 21) while extending radially inside from the threaded portion 21. That is, the outer diameter of the tapered portion 22 gradually decreases from the threaded portion 21 toward the other axial end of the inner sleeve 2. Moreover, for the second conical surface 2s2 of the inner sleeve 2 and the first conical surface 1s2 of the outer sleeve 1 to fit in their shapes, the inclination angles of the second conical surface 2s2 and the first conical surface 1s2 relative to the axial direction A are the same. Then, with the second conical surface 2s2 located radially inside and mated with the first conical surface 1s2, the inner sleeve 2 and the outer sleeve 1 can move relatively in the axial direction A. The inner circumferential surface of the inner sleeve 2 is formed with a second cylindrical surface 2s1 (an example of a second mounting surface) for mounting on the shaft SH.

Further, in order to improve the elastic deformation ability of the inner sleeve 2, the second cylindrical surface 2s1 of the inner sleeve 2 is formed with a plurality of grooves 2c, as shown in FIG. 1C. The plurality of grooves 2c spaced apart along the circumference of the inner sleeve 2 each extend (substantially) along the axial direction A, and open radially inside and close in other directions.

Further, the end surface of one axial end of the inner sleeve 2 (the threaded portion 21 or the end of the inner sleeve 2 away from the tapered portion 22) corresponds to the below fixing holes 3h1 of the supporting ring 3, as shown in FIG. 2A. The mounting and disassembling assembly further includes fixing members 33 such as bolts, which are threadedly connected to the supporting ring 3 when inserted through the fixing holes 3h1. The fixing members 33 abut against the end surface of one axial end of the inner sleeve 2, so that the inner sleeve 2 and the supporting ring can be relatively fixed.

In the present embodiment, the supporting ring 3 is cylinder-shaped, as shown in FIGS. 1A and 1D. The supporting ring 3 includes a second large-diameter portion 31 and a second small-diameter portion 32 that are connected to each other. The outer diameter of the second large-diameter portion 31 is greater than that of the second small-diameter portion 32. Thereby, the outer circumference of the supporting ring 3 is formed with a second step structure through the second large-diameter portion 31 and the second small-diameter portion 32. At the second small-diameter portion 32, the outer circumferential surface of the supporting ring 3 is formed with a third cylindrical surface 3s (an example of a third mounting surface) for mounting the bearing BE that is the bottom surface of the second step structure. While the bottom surfaces (first cylindrical surface 1s1 and third cylindrical surface 3s) of the second step structure and the first step structure support the bearing BE, the large-diameter portions (first large-diameter portion 11 and third large-diameter portion 31) of the first and second step structures are for defining the axial position of the bearing BE. Here, the surface of the first large-diameter portion 11 facing one axial end side can be referred to as the outer sleeve axial limit surface, and the end surface of the third large-diameter portion 31 facing the other axial end side (the left side in FIG. 2E) as the supporting ring axial limit surface. The outer sleeve axial limit surface and the supporting ring axial limit surface define the axial position of the bearing BE. In addition, the inner circumferential surface of the supporting ring 3 is formed with an internal thread corresponding to the external thread of the threaded portion 21 of the inner sleeve 2. Then the supporting ring 3 can be threadedly connected to the inner sleeve 2, and mounted on the threaded portion 21 by moving said supporting ring 3 relative to the inner sleeve 2 in the axial direction A.

Further, as shown in FIG. 1D, the supporting ring 3 is formed with a plurality of fixing holes 3h1 evenly distributed along the circumference that extends through in the axial direction A. The supporting ring 3 has internal threads formed in the fixing holes 3h1 for threaded connection with the external threads of the fixing members 33. In addition, each fixing hole 3h1 faces the end surface of one axial end of the inner sleeve 2, so that the fixing members 33 extending through the fixing holes 3h1 can abut against the end surface of the one axial end of the inner sleeve 2.

Further, as shown in FIG. 1D, the supporting ring 3 is formed with third disassembling holes 3h2 extending through in the axial direction A. The plurality of third disassembling holes 3h2 evenly distributed along the circumference each are formed with an internal thread for threaded connection with the disassembling tool. By rotating the locking nut 4 on the shaft SH to make the below second disassembling holes 4h2 of the locking nut 4 opposite to the third disassembling holes 3h2, the disassembling tool is mounted into the second and third disassembling holes 4h2, 3h2.

In the present embodiment, as shown in FIGS. 1A and 1E, the inner circumferential surface of the locking nut 4 is formed with an internal thread for threaded connection with the shaft SH, so that the locking nut 4 can be threadedly connected to the shaft SH. As shown in FIG. 2E, with the mounting and disassembling assembly mounted on the shaft SH, the locking nut 4 will abut against the outer sleeve 1 for defining the axial position of the outer sleeve 1 relative to the shaft SH. In addition, the inner circumferential surface of the locking nut 4 is formed with an annular groove 4c extending continuously along the full circumference. The annular groove 4c opening radially inside and recessed radially outside cuts off the internal thread of the locking nut 4 in the axial direction. As shown in FIG. 1E, the locking nut 4 is formed with mounting holes 4h1 extending in the axial direction A and through the annular groove 4c. Specifically, the portions of the mounting holes 4h1 on one axial end side of the ring groove 4c may be threaded, while those on the other axial end side of the ring groove 4c may not be threaded. As shown in FIG. 2E, locking bolt(s) 5 is mounted into and threadedly connected to the mounting hole(s) 4h1, so that the portions on both sides of the ring groove 4c of the locking nut 4 clamp the threads of the shaft SH, thereby defining the axial position of the locking nut 4 relative to the shaft SH, i.e. relatively fixing the locking nut 4 and the shaft SH.

Further, the locking nut 4 is formed with second disassembling holes 4h2 mated with the first and third disassembling holes 1h3, 3h2 and extending through the locking nut 4 in the axial direction A, as shown in FIG. 1E. By rotating the locking nut 4 on the shaft SH, the second disassembling holes 4h2 can be aligned with the first disassembling holes 1h3 of the outer sleeve 1 or the third disassembling holes 3h2 of the supporting ring 3. Then the disassembling tool can be mounted into the first and second disassembling holes 1h3, 4h2 or into the second and third disassembling holes 4h2, 3h2.

The mounting method for mounting the bearing BE on the shaft SH using the above mounting and disassembling assembly will be illustrated below with reference to FIGS. 2A to 2F.

Mounting Method

Take mounting a pair of thrust bearings BE on the shaft SH for example.

First, as shown in FIG. 2A, the bearing BE is mounted on the first cylindrical surface 1s1 of the outer sleeve 1. Specifically, the bearing BE and the outer sleeve 1 need to be mounted together through interference fit, so that the bearing BE or the outer sleeve 1 needs to be heated or cooled respectively before mounting. Then, the outer sleeve 1 is placed on a horizontal mounting supporting surface, and a pair of thrust bearings BE are vertically mounted on the first cylindrical surface 1s1 of the outer sleeve 1. After the pair of thrust bearings BE are mounted in place, the flange of the bearings BE is positioned against the first step structure of the outer sleeve 1 (the first large-diameter portion 11). Upon completing the above procedures, the assembly composed of the bearing BE and the outer sleeve 1 is placed at room temperature.

Further, as shown in FIG. 2A, the inner sleeve 2 is mounted into the outer sleeve 1. Specifically, the inner sleeve 2 is vertically mounted into the assembly composed of the bearing BE and the outer sleeve 1 that is placed on the horizontal mounting supporting surface, so that the first conical surface 1s2 is mated with the second conical surface 2s2. Moreover, the inner sleeve 2 may be vertically pressed a certain distance into the outer sleeve 1 to prevent them from being disconnected during transportation, provided that the inner diameter of the inner sleeve 2 is greater than the outer diameter of the shaft SH to be mounted.

Further, as shown in FIG. 2A, the supporting ring 3 is mounted on the inner sleeve 2 for threaded connection. After the inner sleeve 2 is threadedly connected to the supporting ring 3, the relative position for surface contact between the first conical surface 1s2 of the outer sleeve 1 and the second conical surface 2s2 of the inner sleeve 2 is determined according to the actual sizes of detected points on the inspection report of the outer sleeve 1 and the inner sleeve 2; and the outer sleeve 1 is pushed to place the outer sleeve 1 and the inner sleeve 2 in a predetermined relative position, and enable a gap for clearance fit between the inner sleeve 2 and the shaft SH. In addition, the threaded connection length of the external thread of the inner sleeve 2 and the internal thread of the supporting ring 3 is adjusted according to the actual width sizes on the inspection report of the supporting ring 3 and the bearing BE, so as to ensure the advance distance of the outer sleeve 1 on the inner sleeve 2 in subsequent mounting steps. This advance distance is the axial distance between the flange of the bearing BE and the second step structure (second large-diameter portion 31) of the supporting ring 3 as shown in FIGS. 2A to 2C. When the flange of the bearing BE is in contact with the second step structure of the supporting ring 3, the amount for interference fit between the inner sleeve 2 and the shaft SH can be ensured.

It is to be noted that if the shaft diameter is out of tolerance, the relative position of the supporting ring 3 and the inner sleeve 2 must be adjusted according to the actual shaft diameter to ensure interference fit between each component (i.e., the shaft SH, the inner sleeve 2, the outer sleeve 1, and the bearing inner ring) in subsequent mounting steps. It is to be noted that the above adjustment is subject to parameters such as the maximum tangential stress for the material of the bearing inner ring and the geometric dimensions thereof. The threaded connection length of the internal thread of the supporting ring 3 and the external thread of the inner sleeve 2 may be adjusted by an adjusting handle as shown in FIGS. 1A and 2A. After the position of the supporting ring 3 is determined, the adjusting handle is removed, and the supporting ring 3 and the inner sleeve 2 are relatively fixed by fixing members 33 such as locking screws. FIG. 2A shows a schematic diagram of the assembly following the above mounting steps.

In addition, when a bearing seat SE needs to be mounted, the assembly following the above mounting steps is turned (i.e. turned upside down), and mounted in the bearing seat SE placed on the horizontal mounting supporting surface; and then an end cover CO is mounted, and joined together with the bearing seat SE by bolts to obtain the finished assembly as shown in FIG. 2B. Then, the assembly composed of the bearing BE, the outer sleeve 1, the inner sleeve 2, the supporting ring 3, the bearing seat SE and the end cover CO is horizontally or vertically mounted on the shaft SH until the axial end surface of the second large-diameter portion 31 of the supporting ring 3 abuts against the shoulder of the shaft SH. The whole assembly is positioned in the axial direction by the supporting ring 3 abutting against the shoulder of the shaft SH. Since the inner diameter of the outer sleeve 1 is slightly greater than the shaft diameter, the inner sleeve 2 and the supporting ring 3 are in clearance fit with the shaft SH in this step. Thus, the above mounting procedure can be accomplished without any auxiliary devices.

Further, as shown in FIGS. 2C and 2D, hydraulic nuts and hydraulic pump connectors are mounted on the shaft SH. The hydraulic nuts exert axial thrust on the outer sleeve