Assembly method of multi-row tandem thrust roller bearings

Abstract

The present invention relates to the technical field of bearing axial clearance assembly, specifically a method for assembling a multi-row tandem thrust roller bearing. The steps include assembling the upper half group, assembling the lower half group, measuring the dimensions of parts, and grinding the parts. Taking the second layer as an example, a micrometer is used to hit the upper end face of the second seat ring, and after the second seat ring is rotated and the axial runout of the second seat ring is measured to meet the requirements, the micrometer pointer is aligned with zero. The first outer spacer is installed on the first seat ring, and the micrometer is hit on the upper end face of the second seat ring to measure the height difference. If it is +Xum, the plane size of the first outer spacer is ground to Xum. If it is still zero, the second retaining frame assembly needs to be removed and the first outer spacer is placed on it. The micrometer is hit on the upper end face of the second seat ring to measure the height difference. If it is -Yum, the plane size of the first inner spacer is ground to Yum. After the parts grinding step is completed, assembly is performed. The present invention ensures that the various parts are evenly stressed after the bearing is loaded, meeting the requirements of the design to withstand high axial forces and long service life.

Description

Technical Field

[0001] The invention relates to the technical field of bearing axial clearance assembly, in particular to a method for assembling a multi-row tandem thrust roller bearing. Background Art

[0002] Multi-row tandem thrust roller bearings include multiple bearing unit assemblies connected in series. Each bearing unit assembly includes a shaft ring, a retaining frame assembly, an inner spacer ring and a seat ring. The shaft ring is sleeved on the main shaft, and the inner spacer ring and retaining frame assembly are arranged on the upper part of the shaft ring from one side of the main shaft to the outside. The seat ring is installed on the upper part of the retaining frame assembly, and the shaft ring of the next bearing unit assembly is installed on the upper part of the inner spacer ring.

[0003] Six-row tandem thrust roller bearings consist of an upper and lower bearing assembly, a center race located between the upper and lower bearings, an inner sleeve mounted on the main shaft, a bottom race mounted on the bottom of the upper bearing assembly, and an outer race mounted on the outer side of the lower bearing assembly. Each bearing assembly contains three units. When assembling six-row tandem thrust roller bearings, ensuring zero axial clearance is difficult, failing to meet assembly requirements and lacking a targeted assembly method. Summary of the Invention

[0004] In view of the defects of the prior art, the present invention provides a method for assembling a multi-row tandem thrust roller bearing, which can effectively ensure the requirement of zero axial clearance of the bearing.

[0005] In order to achieve the above object, the technical solution provided by the present invention is a method for assembling a multi-row tandem thrust roller bearing, the steps of which include assembling the upper half group, assembling the lower half group, measuring the dimensions of the parts and grinding the parts;

[0006] The upper half assembly steps include:

[0007] S100, sequentially installing the first shaft ring, the first retainer assembly, the first inner spacer ring, and the first seat ring, rotating the first seat ring and measuring the axial runout of the first seat ring to ensure that it meets the requirements, then starting S200;

[0008] S200, sequentially installing a second shaft ring, a second retainer assembly, a second inner spacer, and a second seat ring on the first inner spacer;

[0009] Use a dial indicator to hit the upper end face of the second race, rotate the second race and measure the axial runout of the second race to meet the requirements. After the dial indicator pointer is at zero, install the first outer spacer on the first race, hit the dial indicator on the upper end face of the second race to measure the height difference. If it is +Xum, then grind the flat size of the first outer spacer by Xum. If it is still zero, remove the second cage assembly and replace it with the first outer spacer. Hit the dial indicator on the upper end face of the second race to measure the height difference. If it is -Yum, then grind the flat size of the first inner spacer by Yum.

[0010] S300, sequentially installing a third shaft ring, a third retainer assembly, a third inner spacer ring, and a third seat ring on the second inner spacer ring;

[0011] Use a dial indicator to hit the upper end face of the third seat ring, rotate the third seat ring and measure the axial runout of the third seat ring to meet the requirements. Then, point the dial indicator to zero. Install the second outer spacer on the second seat ring. Use a dial indicator to hit the upper end face of the third seat ring to measure the height difference. If it is +Aum, then grind the flat size of the second outer spacer to Aum. If it is still zero, remove the third cage assembly and replace it with the second outer spacer. Use a dial indicator to hit the upper end face of the third seat ring to measure the height difference. If it is -Bum, then grind the flat size of the second inner spacer to Bum. At this point, the upper assembly work is completed, and the total assembly height H1 of the upper assembly needs to be measured.

[0012] The lower half assembly steps include:

[0013] H100, install the fourth shaft ring, the fourth retainer assembly, the fourth inner spacer ring and the fourth seat ring in sequence, rotate the fourth seat ring and measure the axial runout of the fourth seat ring to ensure that it meets the requirements, then start H200;

[0014] H200, sequentially install the fifth shaft ring, the fifth retainer assembly, the fifth inner spacer ring and the fifth seat ring on the fourth inner spacer ring;

[0015] Use a dial indicator to hit the upper end face of the fifth seat ring, rotate the fifth seat ring and measure the axial runout of the fifth seat ring. After that, the dial indicator pointer is aligned with zero. Install the third outer spacer on the fourth seat ring. Hit the dial indicator on the upper end face of the fifth seat ring to measure the height difference. If it is +Mum, then grind the plane size of the third outer spacer to Mum. If it is still zero, remove the fifth cage assembly and replace it with the third outer spacer. Hit the dial indicator on the upper end face of the fifth seat ring to measure the height difference. If it is -Num, then grind the plane size of the fourth inner spacer to Num.

[0016] H300, sequentially install the sixth shaft ring, the sixth retainer assembly, the sixth inner spacer ring and the sixth seat ring on the fifth inner spacer ring;

[0017] Use a dial indicator to hit the upper end face of the sixth seat ring, rotate the sixth seat ring and measure the axial runout of the sixth seat ring. After that, the dial indicator pointer is aligned with zero. Install the fourth outer spacer on the fifth seat ring. Use a dial indicator to hit the upper end face of the sixth seat ring to measure the height difference. If it is +Pum, then grind the flat size of the fourth outer spacer to Pum. If it is still zero, remove the sixth cage assembly and replace it with the fourth outer spacer. Use a dial indicator to hit the upper end face of the sixth seat ring to measure the height difference. If it is -Qum, then grind the flat size of the fifth inner spacer to Qum. At this point, the assembly of the lower half group is completed, and the total height H2 of the lower half group needs to be measured.

[0018] The steps of measuring the part size include: measuring the inner sleeve height H3, measuring the outer ring height H4, measuring the middle seat ring height H5, and measuring the bottom shaft ring height H6;

[0019] Parts grinding steps include:

[0020] W100, according to H1+H5+H4=H3+H6+H2, we get H5-H6=H3+H2-H1-H4=Cum, and grind the middle race GS and / or bottom shaft race WS to meet H5-H6=Cum;

[0021] W200, assemble.

[0022] Furthermore, the sequential installation of the first shaft ring, the first retainer assembly, the first inner spacer ring, and the first seat ring in step S100 includes:

[0023] S110, installing the first shaft ring;

[0024] S120, installing the first retainer assembly and the first inner spacer ring on the first shaft ring from the outside to the side close to the shaft;

[0025] S130. Install the first seat ring on the first retainer assembly.

[0026] Furthermore, the step S200 of sequentially installing the second shaft ring, the second retainer assembly, the second inner spacer ring, and the second seat ring on the first inner spacer ring includes:

[0027] S210, installing a second shaft ring on the first inner spacer ring;

[0028] S220, install the second retainer assembly and the second inner spacer ring on the second shaft ring from the outside to the side close to the shaft;

[0029] S230. Install the second seat ring on the second retainer assembly.

[0030] Furthermore, the step S300 of sequentially installing the third shaft ring, the third retainer assembly, the third inner spacer ring, and the third seat ring on the second inner spacer ring includes:

[0031] S310, installing a third shaft ring on the second inner spacer ring;

[0032] S220, install the third retainer assembly and the third inner spacer ring on the third shaft ring from the outside to the side close to the shaft;

[0033] S230. Install the third seat ring on the third retainer assembly.

[0034] Furthermore, the sequential installation of the fourth shaft ring, the fourth retainer assembly, the fourth inner spacer ring, and the fourth seat ring in step H100 includes:

[0035] H110, install the fourth shaft ring;

[0036] H120. Install the fourth retainer assembly and the fourth inner spacer ring on the fourth shaft ring from the outside to the side close to the shaft.

[0037] H130. Install the fourth seat ring on the fourth retainer assembly.

[0038] Furthermore, the step H200 of sequentially installing the fifth shaft ring, the fifth retainer assembly, the fifth inner spacer ring, and the fifth seat ring on the fourth inner spacer ring includes:

[0039] H210, installing the fifth shaft ring on the fourth inner spacer ring;

[0040] H220. Install the fifth retainer assembly and the fifth inner spacer ring on the fifth shaft ring from the outside to the side closest to the shaft.

[0041] H230. Install the fifth race on the fifth retainer assembly.

[0042] Furthermore, the step H300 of sequentially installing the sixth shaft ring, the sixth retainer assembly, the sixth inner spacer ring, and the sixth seat ring on the fifth inner spacer ring includes:

[0043] H310, installing the sixth shaft ring on the fifth inner spacer ring;

[0044] H320. Install the sixth retainer assembly and the sixth inner spacer ring on the sixth shaft ring from the outside to the side close to the shaft.

[0045] H330. Install the sixth seat ring on the sixth retainer assembly.

[0046] The beneficial effects of the present invention are as follows: the assembly method is organized, the measurement objects and steps are non-redundant, the grinding objects and sizes determined according to the measurement results are relatively accurate, and the assembly efficiency is greatly improved. The assembly method of the present invention can effectively ensure the requirement of zero axial clearance of the bearing, thereby ensuring that the various parts are evenly stressed after the bearing is loaded, and meeting the requirements of the design for withstanding high axial forces and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the structure of a multi-row tandem thrust roller bearing in one embodiment of the present invention;

[0048] In the picture:

[0049] 110, first shaft ring, 120, second shaft ring, 130, third shaft ring, 140, fourth shaft ring, 150, fifth shaft ring, 160, sixth shaft ring,

[0050] 210, first retainer assembly, 220, second retainer assembly, 230, third retainer assembly, 240, fourth retainer assembly, 250, fifth retainer assembly, 260, sixth retainer assembly,

[0051] 310, first inner spacer, 320, second inner spacer, 330, third inner spacer, 340, fourth inner spacer, 350, fifth inner spacer, 360, sixth inner spacer,

[0052] 410, first seat ring, 420, second seat ring, 430, third seat ring, 440, fourth seat ring, 450, fifth seat ring, 460, sixth seat ring,

[0053] 510, first outer spacer, 520, second outer spacer, 530, third outer spacer, 540, fourth outer spacer,

[0054] 600, inner sleeve, 610, inner sleeve bottom ring,

[0055] 700, outer ring,

[0056] 800, middle seat ring,

[0057] 900, bottom shaft ring. DETAILED DESCRIPTION

[0058] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0059] See also Figure 1 , a multi-row tandem thrust roller bearing assembly method, the steps of which include assembling the upper half group, assembling the lower half group, measuring the size of parts and grinding the parts;

[0060] The first half of the assembly steps include:

[0061] Step S100: sequentially install the first shaft ring 110, the first retainer assembly 210, the first inner spacer 310, and the first seat ring 410, and rotate the first seat ring 410 to measure the axial runout of the first seat ring 410 to meet the requirements, and then start step S200;

[0062] Step S200: sequentially install the second shaft ring 120, the second retainer assembly 220, the second inner spacer 320 and the second seat ring 420 on the first inner spacer 310;

[0063] Use a dial indicator to hit the upper end surface of the second seat ring 420. After rotating the second seat ring 420 and measuring the axial runout of the second seat ring 420 to meet the requirements, the dial indicator pointer is aligned with zero. Install the first outer spacer 510 on the first seat ring 410. Use a dial indicator to hit the upper end surface of the second seat ring 420 to measure the height difference. If it is +Xum, then grind the plane dimension of the first outer spacer 510 by Xum.

[0064] If it is still zero, you need to remove the second retainer assembly 220 and put the first outer spacer 510, the micrometer hit the second seat ring 420 on the end surface to measure the height difference, if -Yum, then the first inner spacer 310 plane size grinding Yum;

[0065] Step S300 , sequentially installing the third shaft ring 130 , the third retainer assembly 230 , the third inner spacer 330 and the third seat ring 430 on the second inner spacer 320 ;

[0066] Use a dial indicator to hit the upper end face of the third seat ring 430, rotate the third seat ring 430 to measure the axial runout of the third seat ring 430. After that, the dial indicator pointer is aligned with zero. Install the second outer spacer 520 on the second seat ring 420. Use a dial indicator to hit the upper end face of the third seat ring 430 to measure the height difference. If it is +Aum, then grind the second outer spacer 520 plane size by Aum.

[0067] If it is still zero, the third retaining frame assembly 230 needs to be removed and the second outer spacer 520 needs to be replaced. The micrometer is used to measure the height difference on the upper end face of the third seat ring 430. If it is -Bum, the plane size of the second inner spacer 320 needs to be ground to Bum. At this point, the upper assembly work is completed, and the total assembly height H1 of the upper assembly needs to be measured.

[0068] The second half of the assembly steps include:

[0069] Step H100: sequentially install the fourth shaft ring 140, the fourth retainer assembly 240, the fourth inner spacer 340, and the fourth seat ring 440, rotate the fourth seat ring 440, and after measuring the axial runout of the fourth seat ring 440 to ensure that it meets the requirements, start H200;

[0070] Step H200: sequentially install the fifth shaft ring 150, the fifth retainer assembly 250, the fifth inner spacer 350 and the fifth seat ring 450 on the fourth inner spacer 340;

[0071] Use a dial indicator to hit the upper end surface of the fifth seat ring 450. Rotate the fifth seat ring 450 to measure the axial runout of the fifth seat ring 450. After the dial indicator pointer is aligned with zero and the axial runout meets the requirements, install the third outer spacer 530 on the fourth seat ring 440. Use a dial indicator to hit the upper end surface of the fifth seat ring 450 to measure the height difference. If it is +Mum, then grind the plane dimension of the third outer spacer 530 to Mum.

[0072] If it is still zero, you need to remove the fifth cage assembly 250 and put the third outer spacer 530, the micrometer hit the fifth seat ring 450 on the end surface to measure the height difference, if it is -Num, then the fourth inner spacer 340 plane size grinding Num;

[0073] Step H300: sequentially install the sixth shaft ring 160, the sixth retainer assembly 260, the sixth inner spacer 360, and the sixth seat ring 460 on the fifth inner spacer 350;

[0074] Use a dial indicator to hit the upper end face of the sixth seat ring 460, rotate the sixth seat ring 460 and measure the axial runout of the sixth seat ring 460. After the dial indicator pointer is aligned with zero and the axial runout meets the requirements, install the fourth outer spacer 540 on the fifth seat ring 450. Use a dial indicator to hit the upper end face of the sixth seat ring 460 to measure the height difference. If it is +Pum, grind the flat dimension of the fourth outer spacer 540 to Pum.

[0075] If it is still zero, remove the sixth cage assembly 260 and replace it with the fourth outer spacer 540. Use a dial indicator to measure the height difference on the upper end face of the sixth seat ring 460. If it is -Qum, grind the flat dimension of the fifth inner spacer 350 to Qum. The assembly of the lower half of the assembly is now complete, and the total height H2 of the lower half of the assembly needs to be measured.

[0076] The steps of measuring the part size include: measuring the height H3 of the inner sleeve 600, measuring the height H4 of the outer ring 700, measuring the height H5 of the middle seat ring 800, and measuring the height H6 of the bottom sleeve ring 900; it should be noted that the height H3 of the inner sleeve 600 does not include the height of the inner sleeve bottom ring 610.

[0077] Parts grinding steps include:

[0078] Step W100: According to H1+H5+H4=H3+H6+H2, H5-H6=H3+H2-H1-H4=Cum is obtained, and the center race 800 and / or the bottom shaft race 900 are ground to meet H5-H6=Cum;

[0079] Step W200: assemble.

[0080] In one embodiment, the sequential installation of the first shaft ring 110, the first retainer assembly 210, the first inner spacer 310, and the first seat ring 410 in step S100 includes:

[0081] Step S110, installing the first shaft ring 110 on the G906 platform;

[0082] Step S120 , respectively installing the first retainer assembly 210 and the first inner spacer 310 on the first shaft ring 110 from the outside to the side close to the shaft;

[0083] Step S130 : Install the first race 410 on the first retaining frame assembly 210 .

[0084] In one embodiment, the step S200 of sequentially installing the second shaft ring 120, the second retainer assembly 220, the second inner spacer 320, and the second seat ring 420 on the first inner spacer 310 includes:

[0085] Step S210: Install the second shaft ring 120 on the first inner spacer 310;

[0086] Step S220 , installing the second retainer assembly 220 and the second inner spacer 320 on the second shaft ring 120 from the outside to the side close to the shaft;

[0087] Step S230 : Install the second race 420 on the second retainer assembly 220 .

[0088] In one embodiment, the step S300 of sequentially installing the third shaft ring 130 , the third retainer assembly 230 , the third inner spacer 330 , and the third seat ring 430 on the second inner spacer 320 includes:

[0089] Step S310: Install the third shaft ring 130 on the second inner spacer ring 320;

[0090] Step S220: Install the third retainer assembly 230 and the third inner spacer 330 on the third shaft ring 130 from the outside to the side close to the shaft;

[0091] Step S230 : Install the third race 430 on the third retaining frame assembly 230 .

[0092] In one embodiment, the sequential installation of the fourth shaft ring 140 , the fourth retainer assembly 240 , the fourth inner spacer ring 340 , and the fourth seat ring 440 in step H100 includes:

[0093] Step H110: Install the fourth shaft ring 140;

[0094] Step H120: Install the fourth retainer assembly 240 and the fourth inner spacer 340 on the fourth shaft ring 140 from the outside to the side close to the shaft;

[0095] Step H130 , installing the fourth shaft ring 140 on the fourth retaining frame assembly 240 .

[0096] In one embodiment, the step H200 of sequentially installing the fifth shaft ring 150, the fifth retainer assembly 250, the fifth inner spacer 350, and the fifth seat ring 450 on the fourth inner spacer 340 includes:

[0097] Step H210: Install the fifth shaft ring 150 on the fourth inner spacer ring 340;

[0098] Step H220: Install the fifth retainer assembly 250 and the fifth inner spacer 350 on the fifth shaft ring 150 from the outside to the side close to the shaft;

[0099] Step H230 , installing the fifth race 450 on the fifth retaining frame assembly 250 .

[0100] In one embodiment, the step H300 of sequentially installing the sixth shaft ring 160, the sixth retainer assembly 260, the sixth inner spacer 360, and the sixth seat ring 460 on the fifth inner spacer 350 includes:

[0101] Step H310: Install the sixth shaft ring 160 on the fifth inner spacer ring 350;

[0102] Step H320: Install the sixth retainer assembly 260 and the sixth inner spacer 360 on the sixth shaft ring 160 from the outside to the side close to the shaft;

[0103] Step H330 , installing the sixth race 460 on the sixth retaining frame assembly 260 .

[0104] The assembly method in this embodiment is organized, the measurement objects and steps are non-redundant, and the grinding objects and sizes determined based on the measurement results are relatively accurate, which greatly improves the assembly efficiency. Using the assembly method of the present invention, the requirement of zero axial clearance of the bearing can be effectively guaranteed, thereby ensuring that the various parts are evenly stressed after the bearing is loaded, meeting the design requirements of withstanding high axial forces and having a long service life.

[0105] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0107] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0108] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

Claims

1. Multi-row tandem thrust roller bearing assembly method, characterized by : The steps include upper half assembly, lower half assembly, measuring part dimensions and part grinding; The upper half assembly steps include: S100, sequentially installing the first shaft ring, the first retainer assembly, the first inner spacer ring, and the first seat ring, rotating the first seat ring and measuring the axial runout of the first seat ring to ensure that it meets the requirements, then starting S200; S200, sequentially installing a second shaft ring, a second retainer assembly, a second inner spacer, and a second seat ring on the first inner spacer; Use a dial indicator to hit the upper end face of the second race, rotate the second race and measure the axial runout of the second race to meet the requirements. After the dial indicator pointer is at zero, install the first outer spacer on the first race, hit the dial indicator on the upper end face of the second race to measure the height difference. If it is +Xum, then grind the flat size of the first outer spacer by Xum. If it is still zero, remove the second cage assembly and replace it with the first outer spacer. Hit the dial indicator on the upper end face of the second race to measure the height difference. If it is -Yum, then grind the flat size of the first inner spacer by Yum. S300, sequentially installing a third shaft ring, a third retainer assembly, a third inner spacer ring, and a third seat ring on the second inner spacer ring; Use a dial indicator to hit the upper end face of the third seat ring, rotate the third seat ring and measure the axial runout of the third seat ring to meet the requirements. Then, point the dial indicator to zero. Install the second outer spacer on the second seat ring. Use a dial indicator to hit the upper end face of the third seat ring to measure the height difference. If it is +Aum, then grind the flat size of the second outer spacer to Aum. If it is still zero, remove the third cage assembly and replace it with the second outer spacer. Use a dial indicator to hit the upper end face of the third seat ring to measure the height difference. If it is -Bum, then grind the flat size of the second inner spacer to Bum. At this point, the upper assembly work is completed, and the total assembly height H1 of the upper assembly needs to be measured. The lower half assembly steps include: H100, install the fourth shaft ring, the fourth retainer assembly, the fourth inner spacer ring and the fourth seat ring in sequence, rotate the fourth seat ring and measure the axial runout of the fourth seat ring to ensure that it meets the requirements, then start H200; H200, sequentially install the fifth shaft ring, the fifth retainer assembly, the fifth inner spacer ring and the fifth seat ring on the fourth inner spacer ring; Use a dial indicator to hit the upper end face of the fifth seat ring, rotate the fifth seat ring and measure the axial runout of the fifth seat ring. After that, the dial indicator pointer is aligned with zero. Install the third outer spacer on the fourth seat ring. Hit the dial indicator on the upper end face of the fifth seat ring to measure the height difference. If it is +Mum, then grind the plane size of the third outer spacer to Mum. If it is still zero, remove the fifth cage assembly and replace it with the third outer spacer. Hit the dial indicator on the upper end face of the fifth seat ring to measure the height difference. If it is -Num, then grind the plane size of the fourth inner spacer to Num. H300, sequentially install the sixth shaft ring, the sixth retainer assembly, the sixth inner spacer ring and the sixth seat ring on the fifth inner spacer ring; Use a dial indicator to hit the upper end face of the sixth seat ring, rotate the sixth seat ring and measure the axial runout of the sixth seat ring. After that, the dial indicator pointer is aligned with zero. Install the fourth outer spacer on the fifth seat ring. Use a dial indicator to hit the upper end face of the sixth seat ring to measure the height difference. If it is +Pum, then grind the flat size of the fourth outer spacer to Pum. If it is still zero, remove the sixth cage assembly and replace it with the fourth outer spacer. Use a dial indicator to hit the upper end face of the sixth seat ring to measure the height difference. If it is -Qum, then grind the flat size of the fifth inner spacer to Qum. At this point, the assembly of the lower half group is completed, and the total height H2 of the lower half group needs to be measured. The steps to measure part size include: Measure the inner sleeve height H3, the outer ring height H4, the middle race height H5, and the bottom race height H6; Parts grinding steps include: W100, according to H1+H5+H4=H3+H6+H2, we get H5-H6=H3+H2-H1-H4=Cum, and grind the middle race GS and / or bottom shaft race WS to meet H5-H6=Cum; W200, assemble.

2. The method for assembling a multi-row tandem thrust roller bearing according to claim 1, wherein: The step S100 of sequentially installing the first shaft ring, the first retainer assembly, the first inner spacer ring, and the first seat ring includes: S110, installing the first shaft ring; S120, installing the first retainer assembly and the first inner spacer ring on the first shaft ring from the outside to the side close to the shaft; S130: Install the first race on the first retainer assembly.

3. The method for assembling a multi-row tandem thrust roller bearing according to claim 1, wherein: The step S200 of sequentially installing the second shaft ring, the second retainer assembly, the second inner spacer ring, and the second seat ring on the first inner spacer ring includes: S210, installing a second shaft ring on the first inner spacer ring; S220, install the second retainer assembly and the second inner spacer ring on the second shaft ring from the outside to the side close to the shaft; S230. Install the second seat ring on the second retainer assembly.

4. The method for assembling a multi-row tandem thrust roller bearing according to claim 1, wherein: The step S300 of sequentially installing the third shaft ring, the third retainer assembly, the third inner spacer ring, and the third seat ring on the second inner spacer ring includes: S310, installing a third shaft ring on the second inner spacer ring; S220, install the third retainer assembly and the third inner spacer ring on the third shaft ring from the outside to the side close to the shaft; S230. Install the third seat ring on the third retainer assembly.

5. The method for assembling a multi-row tandem thrust roller bearing according to claim 1, wherein: The step H100 of sequentially installing the fourth shaft ring, the fourth retainer assembly, the fourth inner spacer ring, and the fourth seat ring includes: H110, install the fourth shaft ring; H120. Install the fourth retainer assembly and the fourth inner spacer ring on the fourth shaft ring from the outside to the side close to the shaft. H130. Install the fourth seat ring on the fourth retainer assembly.

6. The method for assembling a multi-row tandem thrust roller bearing according to claim 1, wherein: The step H200 of sequentially installing the fifth shaft ring, the fifth retainer assembly, the fifth inner spacer ring, and the fifth seat ring on the fourth inner spacer ring includes: H210, installing the fifth shaft ring on the fourth inner spacer ring; H220. Install the fifth retainer assembly and the fifth inner spacer ring on the fifth shaft ring from the outside to the side closest to the shaft. H230. Install the fifth race on the fifth retainer assembly.

7. The method for assembling a multi-row tandem thrust roller bearing according to claim 1, wherein: The step H300 of sequentially installing the sixth shaft ring, the sixth retainer assembly, the sixth inner spacer ring, and the sixth seat ring on the fifth inner spacer ring includes: H310, installing the sixth shaft ring on the fifth inner spacer ring; H320. Install the sixth retainer assembly and the sixth inner spacer ring on the sixth shaft ring from the outside to the side close to the shaft. H330. Install the sixth seat ring on the sixth retainer assembly.

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