Mounting structure for tightly sleeving bearing on shaft

Abstract

The utility model discloses a mounting structure for tightly sleeving a bearing on a shaft. The mounting structure comprises the bearing, the shaft and a plurality of wedges, a plurality of positioning grooves are uniformly formed in the circumference of the inner wall surface of the bearing inner ring, and the bottom surface of each positioning groove is an inclined surface; the wedge is in an inverted L shape, the outer side face of a vertical part of the wedge is an inclined face matched with the bottom face of a positioning groove in the bearing inner ring, the inner side face of the vertical part is an arc face matched with the inner diameter of the bearing inner ring, and the thickness, gradually thinned from top to bottom, of the vertical part is matched with the depth, gradually shallower from top to bottom, of the positioning groove in the bearing inner ring. After the bearing is pressed on the shaft in a sleeving mode and the lower end face of the bearing inner ring abuts against the shaft shoulder end face of the shaft, the wedges are pressed between the positioning grooves of the bearing inner ring and the outer surface of the shaft in a one-to-one correspondence mode. According to the utility model, axial and radial deviations and stress concentration can be reduced when the bearing is mounted and positioned; and the dismounting difficulty of the bearing and the secondary damage to the bearing during dismounting are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of mounting structure of bearing tight sleeve on the shaft. BACKGROUND

[0002] The interference fit installation of bearing and shaft mostly adopts press-fit of press machine, and the axial deviation and radial deviation of bearing inner ring are prone to occur in the installation process. When the bearing inner ring is press-fit on the shaft using the press machine, the shaft is not placed horizontally on the workbench of the press machine or the bearing is not placed horizontally on the shaft, so when the pressure head of the press machine is pressed down, one side of the bearing inner ring will first contact the shaft, thereby making the axial position of the installed shaft closer to one end of the shaft, and the bearing will bear additional axial force during operation, which will accelerate the fatigue failure of the bearing, shorten the service life of the bearing and cause equipment failure. When the bearing failure analysis is needed after installation and testing, the tested bearing needs to be disassembled, and the traditional disassembly methods such as pulling method, knocking method and press machine method are not only laborious but also easy to cause secondary damage to the bearing, affecting the subsequent bearing failure analysis. SUMMARY

[0003] The utility model aims at overcoming the defects of the prior art and providing a mounting structure of bearing tight sleeve on the shaft, which can reduce the axial and radial deviation and stress concentration during bearing installation and positioning, and reduce the disassembly difficulty of the bearing and the secondary damage to the bearing during disassembly.

[0004] The utility model aims at overcoming the defects of the prior art and providing a mounting structure of bearing tight sleeve on the shaft, which can reduce the axial and radial deviation and stress concentration during bearing installation and positioning, and reduce the disassembly difficulty of the bearing and the secondary damage to the bearing during disassembly.

[0005] The bearing includes a bearing inner ring, a bearing outer ring and rolling elements, and a plurality of positioning grooves are uniformly distributed on the inner wall surface of the bearing inner ring, and the bottom surface of each positioning groove is a slope;

[0006] The wedge is inverted L-shaped, the length of the vertical part of the wedge is adapted to the height of the bearing inner ring, the width of the vertical part of the wedge is adapted to the width of the positioning groove on the bearing inner ring, the outer side surface of the vertical part is a slope adapted to the bottom surface of the positioning groove on the bearing inner ring, the inner side surface of the vertical part is a circular arc surface adapted to the inner diameter of the bearing inner ring, and the thickness of the vertical part gradually decreases from top to bottom is adapted to the depth of the positioning groove on the bearing inner ring gradually decreases from top to bottom.

[0007] After the bearing is pressed on the shaft and the lower end surface of the bearing inner ring abuts against the shaft shoulder end surface, a plurality of wedges are correspondingly pressed into the plurality of positioning grooves of the bearing inner ring and the outer surface of the shaft.

[0008] The lateral part of the wedge is provided with a through hole.

[0009] The bearing mounting structure of the utility model has the following characteristics:

[0010] 1. The four positioning grooves and the wedges can not only distinguish the circumferential direction and reduce the radial or axial movement or deviation of the bearing when the press is pressed, but also can absorb the excessive force and be elastically deformed when the press is pressed, thereby reducing the stress concentration phenomenon caused by the pressure concentration of the bearing inner ring during installation, and protecting the precision fit between the bearing raceway and the rollers.

[0011] 2. When the bearing is installed on the shaft and after the test is completed, the dismountable wedge absorbs most of the dismounting pressure when dismounting, thereby reducing the secondary damage to the bearing during dismounting and reducing the factors that need to be considered during the bearing failure analysis. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a perspective view of the bearing in the bearing mounting structure of the utility model;

[0013] Figure 2 is an axial sectional view of the bearing in the bearing mounting structure of the utility model;

[0014] Figure 3 is a perspective view of the wedge in the bearing mounting structure of the utility model;

[0015] Figure 4 is an axial sectional view of the wedge in the bearing mounting structure of the utility model;

[0016] Figure 5 is an axial sectional view of the bearing mounting structure during step S6 of the utility model;

[0017] Figure 6 is an exploded view of the bearing mounting structure after step S8 of the utility model. DETAILED DESCRIPTION

[0018] The utility model will be further described below with reference to the drawings.

[0019] Please refer to Figures 1 to 4 The bearing mounting structure of the utility model comprises a bearing 1, a shaft 2, and four wedges 4.

[0020] The bearing 1 comprises a bearing inner ring 11, a bearing outer ring and rolling bodies; four positioning grooves 10 are evenly arranged on the inner wall surface of the bearing inner ring 11 in the circumferential direction, and the bottom surface of each positioning groove 10 is a slope.

[0021] The wedge 4 is in an inverted L shape, the length of the vertical part 41 of the wedge 4 is adapted to the height of the bearing inner ring 11, the width of the vertical part 41 of the wedge 4 is adapted to the width of the positioning groove 10 on the bearing inner ring 11, the outer side surface of the vertical part 41 is a slope adapted to the bottom surface of the positioning groove 10 on the bearing inner ring 11, the inner side surface of the vertical part 41 is a circular arc surface adapted to the inner diameter of the bearing inner ring 11, and the thickness of the vertical part 41 gradually decreases from top to bottom and is adapted to the depth of the positioning groove 10 on the bearing inner ring 11 gradually decreasing from top to bottom; a through hole is arranged on the side surface of the horizontal part 42 of the wedge 4.

[0022] After the bearing 1 is pressed on the shaft 2 and the lower end surface of the bearing inner ring 11 abuts against the shaft shoulder end surface of the shaft 2, the four wedges are correspondingly pressed into the four positioning grooves 10 on the bearing inner ring 10 and the outer surface of the shaft 2.

[0023] The mounting structure of the bearing tight sleeve on the shaft is implemented on a press machine, and a press sleeve 3 is further used, and the implementation includes the following steps:

[0024] S1, the stroke parameter of the main shaft of the press machine is adjusted to adapt to the installation position of the bearing 1 and the shaft 2;

[0025] S2, the shaft 2 is vertically fixed on the workbench of the press machine, and the shaft 2 is kept stable by the clamp on the workbench of the press machine;

[0026] S3, the bearing 1 is placed on the upper end surface of the shaft 2, and the bearing inner ring 11 is aligned with the upper end chamfer of the shaft, and the bearing 1 and the shaft 2 are kept from moving radially and axially;

[0027] S4, the lower end surface of the press sleeve 3 is aligned with the upper end surface of the bearing inner ring 11, and the stability of the shaft 2, the bearing 1 and the press sleeve 3 is kept;

[0028] S5, the press machine applies pressure to the upper end surface of the press sleeve 3, and the bearing inner ring 11 is pressed on the shaft 2 through the press sleeve 3 until the lower end surface of the bearing inner ring 11 abuts against the shaft shoulder surface of the shaft 2; the press machine is unloaded;

[0029] S6, the lower part of the four wedges 4 is correspondingly inserted into the upper part of the four positioning grooves on the bearing inner ring 11 (see Figure 5 ), and the upper end surface of the horizontal part of the four wedges 4 is kept at the same horizontal position;

[0030] S7, aligning the lower end face of the pressing sleeve 3 with the upper end face of the lateral part of the four wedges 4; the press applies pressure to the upper end face of the pressing sleeve 3, and the four wedges 4 are correspondingly and completely pressed into the four positioning grooves 10 on the bearing inner ring 11 and the outer surface of the shaft 2 through the pressing sleeve 3, until the lower end face of the four wedges 4 is at the same horizontal position as the lower end face of the bearing inner ring 11;

[0031] S8, the press is unloaded, and the pressing sleeve 3 is taken out (see Figure 6 );

[0032] S9, first insert a round rod into the perforation 40 of one wedge 4, then align the bottom of the two ends of the round rod exposed on the two side faces of the wedge 4 with one pulling claw on the puller, and then rotate the central screw of the puller until the wedge 4 is completely separated from the bearing inner ring 11;

[0033] S10, repeat step S9, and the other three wedges 4 are also completely separated from the bearing inner ring.

[0034] The mounting structure of the bearing tight sleeve on the shaft has the following characteristics:

[0035] 1. Four evenly distributed positioning grooves 10 are formed on the bearing inner ring 11, which can clearly distinguish the direction on the circumference, thereby reducing the radial or axial movement or deviation caused by unclear distinction during installation of the bearing 1;

[0036] 2. The four positioning grooves 10 can well absorb the force borne by the bearing during installation, and elastically deform to absorb excess force during pressing of the press, thereby reducing the stress concentration phenomenon caused by pressure concentration during installation of the bearing 1, thereby protecting the precision fit between the bearing raceway and the rolling element;

[0037] 3. The four positioning grooves evenly formed on the inner wall of the bearing inner ring are more convenient for disassembly of the bearing;

[0038] 4. The inclined surface of the four wedges 4 is convenient for installation and disassembly of the bearing and can maintain the proper wedging degree of the bearing and the shaft;

[0039] 5. The hole diameter of the inner side face of the four wedges 4 absorbs most of the installation / dismounting pressure during disassembly, thereby reducing the secondary damage to the bearing during disassembly, and also reducing the misdiagnosis of failure analysis after bearing test;

[0040] 6. The length, width and height of the four wedges 4 can withstand greater torque and axial force;

[0041] 7. Due to the existence of the lateral part of the four wedges 4, the upper end face of the bearing inner ring 11 is tightly held without scratching the upper end face of the bearing inner ring 11.

[0042] The above examples are only for illustrating the utility model, and are not limitation to the utility model. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the utility model, and all equivalent technical schemes should belong to the scope of the utility model, which should be limited by the claims.

Claims

1. A mounting structure of a bearing tight sleeve on a shaft, comprising a bearing, a shaft and a plurality of wedges; characterized in that, the bearing comprises a bearing inner ring, a bearing outer ring and rolling elements; the inner wall surface of the bearing inner ring is provided with a plurality of positioning grooves which are circumferentially distributed; the bottom surface of each positioning groove is a slope; the wedge is in an inverted L shape; the length of the vertical part of the wedge is adapted to the height of the bearing inner ring; the width of the vertical part of the wedge is adapted to the width of the positioning groove on the bearing inner ring; the outer side surface of the vertical part is a slope which is adapted to the bottom surface of the positioning groove on the bearing inner ring; the inner side surface of the vertical part is a circular arc surface which is adapted to the inner diameter of the bearing inner ring; and the thickness of the vertical part which gradually thins from top to bottom is adapted to the depth of the positioning groove on the bearing inner ring which gradually shallows from top to bottom; after the bearing is pressed on the shaft and the lower end surface of the bearing inner ring abuts against the shaft shoulder end surface of the shaft, a plurality of wedges are correspondingly pressed into the plurality of positioning grooves on the bearing inner ring and the outer surface of the shaft.

2. The mounting structure of the bearing sleeve on the shaft according to claim 1, characterized in that, a through hole is provided on the side surface of the horizontal part of the wedge.

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