Installation method for tightly sleeving bearing on shaft

Abstract

The invention discloses an installation method for tightly sleeving a shaft with a bearing. The installation method comprises the following steps that the shaft is vertically fixed to a workbench of a press machine; the bearing is placed on the upper end face of the shaft; a plurality of positioning grooves are circumferentially and uniformly formed in the inner wall surface of the bearing inner ring; connecting a pressurizing sleeve to the lower end of a main shaft of the press; a press machine applies pressure to the upper end face of the pressurizing sleeve to press and sleeve the inner ring of the bearing on the shaft; a plurality of wedges are inserted into the positioning grooves, and the upper end faces of the wedges are kept at the same horizontal position; aligning the lower end face of the pressurizing sleeve to the upper end faces of the wedges; the press machine applies pressure to the pressurizing sleeve until the lower end faces of the wedges and the lower end face of the bearing inner ring are located at the same horizontal position; unloading the pressure machine, and taking out the pressurizing sleeve; and all the wedges are completely separated from the inner ring of the bearing by adopting a puller. According to the invention, axial / radial deviation, stress concentration, dismounting difficulty and secondary damage to the bearing during bearing mounting and positioning can be reduced.

Description

Technical Field

[0001] The invention relates to a method for installing a bearing sleeve on a shaft. Background Art

[0002] The interference fit installation of bearings and shafts is mostly carried out by press fitting. This press fitting method is prone to axial deviation and radial deviation of the inner ring of the bearing during the installation process. When using a press to press the inner ring of the bearing onto the shaft, the shaft is not placed horizontally on the workbench of the press or the bearing is not placed horizontally on the shaft. Then when the pressure head of the press presses down, one side of the inner ring of the bearing will first contact the shaft, making the axial position after installation closer to one end of the shaft, causing the bearing to bear additional axial force during operation, which will accelerate the fatigue failure of the bearing, shorten the life of the bearing and cause equipment failure. When the failure analysis of the bearing is required after the installation and testing, the bearing needs to be disassembled after the test. The traditional disassembly methods use pulling method, knocking method, press method, etc., which are not only laborious but also easy to cause secondary damage to the bearing, affecting the subsequent failure analysis of the bearing. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a method for installing a bearing tightly sleeved on a shaft, which can reduce axial and radial deviations and stress concentration during bearing installation and positioning; reduce the difficulty of bearing disassembly and secondary damage to the bearing during disassembly.

[0004] The object of the present invention is achieved as follows: a method for installing a bearing sleeve on a shaft, using a press, a press sleeve and a plurality of wedges; wherein the press sleeve is coaxially connected to the lower end of the main shaft of the press, the inner diameter of the press sleeve is less than or equal to the inner diameter of the bearing inner ring, and the outer diameter of the press sleeve is greater than or equal to the outer diameter of the bearing; a plurality of positioning grooves are evenly distributed on 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 length of the vertical portion of the wedge is adapted to the height of the bearing inner ring, the width of the vertical portion of the wedge is adapted to the width of the positioning groove on the bearing inner ring, the outer side surface of the vertical portion is an inclined surface adapted to the bottom surface of the positioning groove on the bearing inner ring, the inner side surface of the vertical portion is an arc surface adapted to the inner diameter of the bearing inner ring, and the thickness of the vertical portion gradually becomes thinner from top to bottom is adapted to the depth of the positioning groove on the bearing inner ring gradually becomes shallower from top to bottom; a through hole is provided on the side of the horizontal portion of the wedge;

[0005] The method for installing a bearing sleeve on a shaft of the present invention comprises the following steps:

[0006] S1. Adjust the stroke parameters of the main shaft of the press to the installation position of the matching bearing and shaft;

[0007] S2. Fix the shaft vertically on the workbench of the press and keep it stable;

[0008] S3. Place the bearing on the upper end surface of the shaft, and align the inner ring of the bearing with the chamfer of the upper end of the shaft to prevent the bearing from moving radially and axially with the shaft.

[0009] S4. Align the lower end surface of the pressurizing sleeve with the upper end surface of the inner ring of the bearing to maintain the overall stability of the shaft, bearing and pressurizing sleeve;

[0010] S5. The press machine applies pressure to the upper end face of the pressurizing sleeve, and the inner ring of the bearing is pressed onto the shaft through the pressurizing sleeve until the lower end face of the inner ring of the bearing abuts against the shoulder end face of the shaft; the press machine unloads the force;

[0011] S6. Insert the lower parts of the plurality of wedges into the upper parts of the plurality of positioning grooves on the inner ring of the bearing in a one-to-one correspondence, and keep the upper end surfaces of the transverse parts of the plurality of wedges at the same horizontal position;

[0012] S7, align the lower end surface of the pressurizing sleeve with the upper end surfaces of the lateral parts of the plurality of wedges; apply pressure to the upper end surface of the pressurizing sleeve by the pressurizing sleeve, and completely press the plurality of wedges into between the plurality of positioning grooves on the inner ring of the bearing and the outer surface of the shaft in a one-to-one correspondence, until the lower end surfaces of the plurality of wedges and the lower end surface of the inner ring of the bearing are at the same horizontal position;

[0013] S8, unload the press and take out the pressurized sleeve;

[0014] S9. First, insert a round rod into the hole of a wedge, then align a puller claw on the puller with the bottom of the two ends of the round rod exposed on both sides of the wedge, and then rotate the central screw of the puller until the wedge is completely separated from the inner ring of the bearing;

[0015] S10, repeat step S9 to remove all other wedges from the inner ring of the bearing.

[0016] In the above-mentioned method for installing a bearing sleeve on a shaft, during step S2, the shaft is kept stable by a fixture on a workbench of a press.

[0017] The method for installing a bearing sleeve on a shaft of the present invention has the following characteristics:

[0018] 1. The present invention adopts four positioning grooves on the inner ring of the bearing, and a wedge is installed in each positioning groove. These positioning grooves and wedges can not only distinguish the direction on the circumference well when the press is pressed and positioned, and reduce the radial or axial movement or deviation, but also absorb the excess force when the press is pressed to produce elastic deformation, thereby reducing the stress concentration phenomenon caused by the pressure concentration on the inner ring of the bearing during installation, thereby protecting the precision match between the bearing raceway and the roller;

[0019] 2. When the bearing is installed on the shaft and tested, when the bearing failure analysis is performed, the removable wedge absorbs most of the disassembly pressure during disassembly, thereby reducing the secondary damage to the bearing during disassembly and reducing the factors that need to be considered when performing bearing failure analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of a bearing in a method for installing a bearing sleeve on a shaft according to the present invention;

[0021] Figure 2 It is an axial cross-sectional view of a bearing in a method for installing a bearing sleeve on a shaft according to the present invention;

[0022] Figure 3 is a perspective view of a wedge in the method for installing a bearing sleeve on a shaft of the present invention;

[0023] Figure 4 It is an axial cross-sectional view of a wedge in the method for installing a bearing sleeve on a shaft according to the present invention;

[0024] Figure 5 is an axial cross-sectional view of the method for installing a bearing sleeve on a shaft according to the present invention in step S6;

[0025] Figure 6 It is an exploded view of the method for installing a bearing sleeve on a shaft after step S8 is performed. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] See also Figures 1 to 4 The method for installing a bearing sleeve on a shaft of the present invention adopts a press (not shown in the figure), a press sleeve 3 and four wedges 4; the press sleeve 3 is coaxially connected to the lower end of the main shaft of the press, the inner diameter of the press sleeve 3 is less than or equal to the inner diameter of the bearing inner ring 11, and the outer diameter of the press sleeve 3 is greater than or equal to the outer diameter of the bearing 1; a plurality of positioning grooves 10 are evenly distributed on the inner wall surface of the bearing inner ring 11, and the bottom surface of each positioning groove 10 is an inclined surface; the wedge 4 is in an inverted L shape, and the length of the vertical portion 41 of the wedge 4 is the same as that of the bearing inner ring 1 1, the width of the vertical portion 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 portion 41 is an inclined surface adapted to the bottom surface of the positioning groove 10 on the bearing inner ring 11, the inner side surface of the vertical portion 41 is an arc surface adapted to the inner diameter of the bearing inner ring 11, and the thickness of the vertical portion 41 gradually becomes thinner from top to bottom and the depth of the positioning groove 10 on the bearing inner ring 11 gradually becomes shallower from top to bottom; a through hole 40 is opened on the side of the horizontal portion 42 of the wedge 4;

[0028] The method for installing a bearing sleeve on a shaft of the present invention comprises the following steps:

[0029] S1. Adjust the stroke parameters of the main shaft of the press to match the installation position of bearing 1 and shaft 2;

[0030] S2, vertically fix the shaft 2 on the working table of the press, and keep the shaft 2 stable by the clamp on the working table of the press;

[0031] S3. Place the bearing 1 on the upper end surface of the shaft 2, and align the inner ring 11 of the bearing with the chamfer of the upper end of the shaft, so as to prevent the radial and axial movement of the bearing 1 and the shaft 2;

[0032] S4. Align the lower end surface of the pressurizing sleeve 3 with the upper end surface of the bearing inner ring 11 to keep the shaft 2, the bearing 1 and the pressurizing sleeve 3 stable as a whole;

[0033] S5. The press machine applies pressure to the upper end surface of the press sleeve 3, and presses the bearing inner ring 11 onto the shaft 2 through the press sleeve 3 until the lower end surface of the bearing inner ring 11 abuts against the shoulder surface of the shaft 2; the press machine unloads the force;

[0034] S6. Insert the lower parts of the four wedges 4 into the upper parts of the four positioning grooves on the inner ring 11 of the bearing in a one-to-one correspondence (see Figure 5 ), and keep the upper end surfaces of the transverse parts of the four wedges 4 at the same horizontal position;

[0035] S7, align the lower end surface of the pressurizing sleeve 3 with the upper end surfaces of the transverse parts of the four wedges 4; the press machine applies pressure to the upper end surface of the pressurizing sleeve 3, and the four wedges 4 are completely pressed into the four positioning grooves 10 on the bearing inner ring 11 and the outer surface of the shaft 2 by the pressurizing sleeve 3, one by one, until the lower end surfaces of the four wedges 4 and the lower end surface of the bearing inner ring 11 are at the same horizontal position;

[0036] S8, unload the press and take out the press sleeve 3 (see Figure 6 );

[0037] S9, first insert a round rod into the through hole 40 of a wedge 4, then align a pulling claw on the puller with the bottom of the two ends of the round rod exposed on the two side surfaces of the wedge 4, and then rotate the central screw of the puller until the wedge 4 is completely separated from the bearing inner ring 11;

[0038] S10, repeat step S9 to separate the other three wedges 4 from the inner ring of the bearing.

[0039] The method for installing a bearing sleeve on a shaft of the present invention has the following characteristics:

[0040] 1. Four evenly distributed positioning grooves 10 are provided on the inner ring 11 of the bearing, so that the direction on the circumference can be clearly distinguished, thereby reducing the radial or axial movement or deviation caused by unclear distinction when the bearing 1 is installed;

[0041] 2. The four positioning grooves 10 can absorb the force exerted on the bearing during installation, and absorb the excess force to elastically deform when the press is pressurized, thereby reducing the stress concentration caused by the pressure concentration during the installation of the bearing 1, thereby protecting the precision match between the bearing raceway and the rolling element;

[0042] 3. Four positioning grooves evenly distributed on the inner wall of the inner ring of the bearing make it easier to disassemble the bearing;

[0043] 4. The inclined surfaces of the four wedges 4 facilitate the installation and removal of the bearing and can maintain the proper wedge tightness between the bearing and the shaft;

[0044] 5. The apertures where the inner surfaces of the four wedges 4 are located absorb most of the installation / disassembly pressure during disassembly, thereby reducing secondary damage to the bearing during disassembly and also reducing misdiagnosis of failure analysis after bearing testing;

[0045] 6. The length, width and height of the four wedges 4 can withstand greater torque and axial force;

[0046] 7. Due to the existence of the transverse parts of the four wedges 4, the upper end surface of the bearing inner ring 11 is tightly clamped without scratching the upper end surface of the bearing inner ring 11.

[0047] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A method for installing a bearing sleeve on a shaft, which uses a press, a press sleeve and a plurality of wedges; the press sleeve is coaxially connected to the lower end of the main shaft of the press, the inner diameter of the press sleeve is less than or equal to the inner diameter of the bearing inner ring, and the outer diameter of the press sleeve is greater than or equal to the outer diameter of the bearing; a plurality of positioning grooves are evenly distributed on 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 length of the vertical portion of the wedge is adapted to the height of the bearing inner ring, the width of the vertical portion of the wedge is adapted to the width of the positioning groove on the bearing inner ring, the outer side surface of the vertical portion is an inclined surface adapted to the bottom surface of the positioning groove on the bearing inner ring, the inner side surface of the vertical portion is an arc surface adapted to the inner diameter of the bearing inner ring, and the thickness of the vertical portion gradually becomes thinner from top to bottom is adapted to the depth of the positioning groove on the bearing inner ring gradually becomes shallower from top to bottom; a through hole is provided on the side of the horizontal portion of the wedge; It is characterized in that The installation method comprises the following steps: S1. Adjust the stroke parameters of the main shaft of the press to the installation position of the matching bearing and shaft; S2. Fix the shaft vertically on the workbench of the press and keep it stable; S3. Place the bearing on the upper end surface of the shaft, and align the inner ring of the bearing with the chamfer of the upper end of the shaft to prevent the bearing from moving radially and axially with the shaft. S4. Align the lower end surface of the pressurizing sleeve with the upper end surface of the inner ring of the bearing to maintain the overall stability of the shaft, bearing and pressurizing sleeve; S5. The press machine applies pressure to the upper end face of the pressurizing sleeve, and the inner ring of the bearing is pressed onto the shaft through the pressurizing sleeve until the lower end face of the inner ring of the bearing abuts against the shoulder end face of the shaft; the press machine unloads the force; S6. Insert the lower parts of the plurality of wedges into the upper parts of the plurality of positioning grooves on the inner ring of the bearing in a one-to-one correspondence, and keep the upper end surfaces of the transverse parts of the plurality of wedges at the same horizontal position; S7, align the lower end surface of the pressurizing sleeve with the upper end surfaces of the lateral parts of the plurality of wedges; apply pressure to the upper end surface of the pressurizing sleeve by the pressurizing sleeve, and completely press the plurality of wedges into between the plurality of positioning grooves on the inner ring of the bearing and the outer surface of the shaft in a one-to-one correspondence, until the lower end surfaces of the plurality of wedges and the lower end surface of the inner ring of the bearing are at the same horizontal position; S8, unload the press and take out the pressurized sleeve; S9. First, insert a round rod into the hole of a wedge, then align a puller claw on the puller with the bottom of the two ends of the round rod exposed on both sides of the wedge, and then rotate the central screw of the puller until the wedge is completely separated from the inner ring of the bearing; S10, repeat step S9 to remove all other wedges from the inner ring of the bearing.

2. The method for installing a bearing sleeve on a shaft according to claim 1, characterized in that: When performing step S2, the shaft is stabilized by a clamp on the workbench of the press.

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