CN117284493A - Bearing assembling method and disassembling method, unit body assembling method and disassembling method - Google Patents

Abstract

The invention provides a bearing assembly method, a bearing disassembly method, a unit body assembly method and a unit body disassembly method. The unit body assembling method includes a bearing assembling method, and the unit body disassembling method includes a bearing disassembling method. In the bearing: the outer ring includes a first end and a second end, the inner ring includes a first half ring and a second half ring, and the first half ring includes a first outer end and a first inner end. The bearing assembly method comprises the following steps: the outer ring is arranged on the first workpiece, the first half ring is arranged on the second workpiece, the first workpiece is sleeved on the outer side of the second workpiece, and the first end and the first outer end are staggered in the axial direction; mounting the rolling elements and cage between the outer ring and the first half ring from an opening between the second end and the first inner end; aligning the first end with the first outer end; and installing a second semi-ring. The bearing decomposition method comprises the following steps: removing the second half ring; staggering the first end axially from the first outer end; removing the rolling elements and cage from the opening between the second end and the first inner end; the outer ring and the first half ring are removed.

Description

Bearing assembling method and disassembling method, unit body assembling method and disassembling method

Technical Field

The invention relates to the technical field of assembly and disassembly of aeroengines, in particular to a bearing assembly method, a bearing disassembly method, a unit body assembly method and a unit body disassembly method.

Background

The aeroengine has complex structure, various parts, high precision of part processing and manufacturing and extremely high assembly difficulty of parts and the whole machine. Currently, conventional aeroengine support schemes generally require 5-8 main point bearings and 3-4 bearing boxes, with at least one ball bearing on each rotor for axial and radial support positioning. Every bearing all needs to seal to prevent that lubricating oil from leaking, foreign matter from getting into, and the sealing member is installed on engine rotor, stator respectively.

In the development of engines, it is often necessary to design, manufacture, and repair test pieces of unit bodies, such as compressor performance test pieces, high-pressure turbine performance test pieces, and the like, in order to study component structures and performances. The test piece rotor is typically designed with a fulcrum bearing at each of the front and rear ends, with one of the bearings being a ball bearing.

At present, the assembly method of the main bearing of the engine test piece generally divides a decomposable ball bearing into two parts, wherein the first part is a bearing outer ring, balls and a retainer, the balls and the bearing outer ring are fixed by adopting a process inner ring, and the second part is a front section and a rear section of the bearing inner ring. The first portion is press-fit onto the bearing outer ring mount when the bearing case component is assembled. When the rotor component is assembled, the front section of the bearing inner ring of the second part is sequentially pressed on the rotor rear shaft together with the air seal rotor ring, the lubricating oil seal rotor ring and the oil slinger at the front part of the bearing, and the rear section of the bearing inner ring is independently involved in the whole machine assembly. When the whole machine is assembled, the rotor of the test piece and the stator casing are vertically supported on the assembly seat, the bearing casing is lifted at the moment, the bearing casing is aligned and penetrates through the rear shaft of the rotor, the bearing casing is arranged on the stator casing in a falling mode, bearing balls fall onto a runway of the front section of the bearing inner ring, and finally the rear section of the bearing inner ring, the compression nut and the rear sealing stator ring of the bearing are installed. The bearing can be disassembled from the test piece by reverse operation.

In the assembling process of the assembling method, parts on the rear shaft of the rotor must pass through a stator sealing ring in the bearing casing, and the comb teeth of the sealing ring are very easy to scratch the front section (runway) of the inner ring of the bearing, the oil slinger and the like, so that the assembling risk is high. Even when the outer diameter of the bearing inner ring is larger than the inner diameter of the bearing front lubricating oil seal stator ring or the bearing front air seal stator ring, the assembly method is not available due to mutual interference among parts, and the bearing inner ring is directly disassembled by the bearing front seal stator ring due to misoperation in the disassembly process, so that collision and even scrapping of the parts are caused.

Disclosure of Invention

The invention aims to provide a bearing assembly method which can avoid collision scratch and interference between a bearing and adjacent parts.

To achieve the object, a bearing assembly method, the bearing including an outer ring, an inner ring, rolling bodies and a cage, the outer ring including axially opposed first and second ends, the inner ring including axially adjacent first and second half rings, the first half ring including a first outer end and a first inner end, the first outer end being aligned with the first end, the first inner end being adjacent the second half ring, the bearing assembly method comprising the steps of: the outer ring is arranged on a first workpiece, the first half ring is arranged on a second workpiece, the first workpiece is sleeved on the outer side of the second workpiece, and the first end and the first outer end are staggered in the axial direction so as to enlarge an opening formed between the second end and the first inner end; installing the rolling bodies and the cage from the opening between the outer ring and the first half ring; axially moving the first workpiece or/and the second workpiece to align the first end with the first outer end; and installing the second semi-ring.

The bearing assembly method breaks through the traditional assembly method, breaks through the solidified assembly habit, can effectively avoid the collision or scratch of the inner ring of the parts arranged on the inner side of the first workpiece in the assembly process by separating the rolling body and the retainer of the bearing from the outer ring, avoids the incapability of assembling or interference of the bearing due to the size of the parts on the inner side of the first workpiece, and has a larger application range. The bearing assembly method is ingenious and reasonable in design, simple to operate and low in assembly risk, the assembly quality can be improved, the existing general tools and equipment are adopted in the assembly process, additional tools are not required to be designed, manufactured and managed, further resource investment can be avoided, the cost is low, and a new idea is opened up for assembly of the bearing.

The invention further aims to provide a bearing decomposition method which can avoid collision scratch and interference between the bearing and adjacent parts.

In order to achieve the object, a bearing assembly method, the bearing being mounted between a first workpiece and a second workpiece, the bearing comprising an outer ring, an inner ring, rolling bodies and a cage, the outer ring comprising axially opposed first and second ends, the inner ring comprising axially adjacent first and second half rings, the first half ring comprising a first outer end and a first inner end, the first outer end being aligned with the first end, the first inner end being adjacent the second half ring, the bearing assembly method comprising the steps of: removing the second half ring; moving the first workpiece or/and the second workpiece axially so that the first end is axially offset from the first outer end to enlarge the opening formed between the second end and the first inner end; removing the rolling elements and the cage from the opening; the outer ring and the first half ring are removed.

The bearing decomposition method breaks through the traditional decomposition method, breaks through the solidification decomposition habit, and can effectively avoid the collision or scratch of the inner ring by the parts arranged on the inner side of the first workpiece in the decomposition process by separating the rolling body and the retainer of the bearing from the outer ring, thereby avoiding the incapability of decomposing or interfering the bearing due to the size of the parts on the inner side of the first workpiece, and having a larger application range. The bearing decomposition method is ingenious and reasonable in design, simple to operate and low in decomposition risk, the decomposition quality can be improved, the existing general tools and equipment are adopted in the decomposition process, additional tools are not required to be designed, manufactured and managed, further input of resources can be avoided, the cost is low, and a new idea is developed for bearing decomposition.

It is still another object of the present invention to provide a method for assembling a unit body, which can avoid collision scratch and interference of a bearing with adjacent parts.

The unit body assembly method for achieving the purpose comprises a first casing and a rotor shaft, wherein the first casing provides the first workpiece, and the rotor shaft provides the second workpiece.

In one or more embodiments of the unit body assembling method, the unit body further includes a second casing, and the unit body assembling method includes: mounting the second casing radially outward of the rotor shaft, vertically positioning the second casing and the rotor shaft, and mounting the outer ring to the first casing; moving the first casing to above the second casing and the rotor shaft; the first casing is dropped onto the second casing and sleeved on the radial outer side of the rotor shaft, and the first casing is connected with the second casing through bolts and nuts; mounting the first half ring radially outward of the rotor shaft; unscrewing the nut to move the nut to a set distance relative to the bolt; moving the first casing upwards until the bolt and the nut respectively abut against one of the first casing and the second casing; mounting the rolling bodies and the cage; and the first casing is fallen onto the second casing, the nut is screwed down, and the second semi-ring is installed.

In one or more embodiments of the unit body assembling method, the unit body assembling method further includes: connecting a lifting device to the first casing, the lifting device comprising a crane scale; reading a first reading G by the hanging scale before the first casing is dropped to the second casing; after the nut is moved to the set distance, the first casing is lifted by the lifting device, and lifting is stopped when the reading of the hanging scale is not less than (G+20 Kg) and not more than (G+50 Kg).

In one or more embodiments of the unit body assembly method, the unit body further includes a rotor member and a stator member, wherein: the stator piece is arranged on the radial inner side of the first casing and is positioned between the bearing and the second casing; the rotor piece is arranged on the radial outer side of the rotor shaft and is positioned between the bearing and the stator piece; the unit body assembling method further comprises the following steps: the rotor member is mounted to the rotor shaft after the first casing is lowered to the second casing and before the first half ring is mounted.

The assembly method of the unit body breaks through the traditional assembly method, breaks through the solidified assembly habit, and changes the first semi-ring, the rolling body and the retainer of the bearing into the assembly stage of the whole machine, namely the assembly stage, by separately assembling the rolling body, the retainer and the outer ring of the bearing, the collision or the scratch of the inner ring of stator parts such as stator sealing rings and the like arranged on the radial inner side of the first casing can be effectively avoided in the assembly process, the problem that the bearing cannot be assembled or interfered due to the size of the stator parts on the radial inner side of the first casing is avoided, and the assembly method has a larger application range. The assembling method of the unit body is ingenious and reasonable in design, simple to operate and low in assembling risk, the assembling quality can be improved, the existing general tools and equipment are adopted in the assembling process, additional tools are not needed to be designed, manufactured and managed, further resource input can be avoided, and the cost is low. The unit body assembling method opens up a new idea for the assembly of the aero-engine, and is not only suitable for the assembly of engine test pieces, but also suitable for the assembly of single-rotor engines.

It is still another object of the present invention to provide a method of disassembling a unit body, which can avoid collision scratch and interference of a bearing with adjacent parts.

The unit body decomposition method for achieving the purpose comprises a first casing and a rotor shaft, wherein the first casing provides the first workpiece, and the rotor shaft provides the second workpiece.

In one or more embodiments of the unit body decomposition method, the unit body further includes a second casing connected to the first casing through a bolt and a nut, and the unit body decomposition method includes: placing the unit body vertically; removing the second half ring; unscrewing the nut to move the nut to a set distance relative to the bolt; moving the first casing upwards until the bolt and the nut respectively abut against one of the first casing and the second casing; removing the rolling bodies and the cage; the first casing is dropped onto the second casing, and the first semi-ring is removed; and decomposing the first casing and the second casing, and removing the first casing from the upper parts of the second casing and the rotor shaft.

In one or more embodiments of the cell decomposition method, the cell decomposition method further comprises: connecting a lifting device to the first casing, the lifting device comprising a crane scale; after the nut is moved to the set distance, lifting the first casing by the lifting device, and stopping lifting when the reading of the hanging scale is not less than (G+20 Kg) and not more than (G+50 Kg), wherein G is the mass of the component assembly including the first casing.

In one or more embodiments of the cell decomposition method, the cell further comprises a rotor member and a stator member, wherein: the stator piece is arranged on the radial inner side of the first casing and is positioned between the bearing and the second casing; the rotor piece is arranged on the radial outer side of the rotor shaft and is positioned between the bearing and the stator piece; the unit body decomposition method further comprises the following steps: the rotor piece is removed from the rotor shaft after removing the first half ring and before decomposing the first casing and the second casing.

The unit body decomposition method breaks through the traditional decomposition method, breaks through the solidification decomposition habit, and changes the first semi-ring, the rolling body and the retainer of the bearing into the first semi-ring, the rolling body and the retainer of the bearing to decompose before decomposing the unit body into the assembly of each component, so that the collision or the scratch of the inner ring by stator parts such as the stator sealing ring arranged on the radial inner side of the first casing in the decomposition process can be effectively avoided, the bearing can not be decomposed or interfered due to the size of the stator parts on the radial inner side of the first casing is avoided, and the unit body decomposition method has a larger application range. The unit body decomposition method is ingenious and reasonable in design, simple to operate, low in decomposition risk, capable of improving the decomposition quality, and low in cost, and the decomposition process is achieved by adopting existing general tools and equipment completely, so that additional tools are not required to be designed, manufactured and managed, further resource investment can be avoided, and cost is low. The unit body decomposition method opens up a new idea for the decomposition of the aeroengine, and is not only suitable for the decomposition of the engine test piece, but also suitable for the decomposition of the single-rotor engine.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description in conjunction with the accompanying drawings and embodiments. It is noted that the drawings are by way of example only, are not drawn to scale and should not be construed to limit the scope of the invention in any way as actually required, and that components having similar or related features or characteristics may have the same or similar reference numerals.

Fig. 1 shows a schematic partial cross-sectional view of a unit body according to an embodiment.

Fig. 2 shows a partial schematic view at a in fig. 1.

Fig. 3 shows a flow diagram of a unit body assembling method according to an embodiment.

Fig. 4 shows a flow diagram of a method of cell decomposition according to one embodiment.

Detailed Description

The following discloses a number of different embodiments or examples of implementing the subject technology. Specific examples of components and arrangements are described below for purposes of simplifying the disclosure, and of course, these are merely examples and are not intended to limit the scope of the invention. Furthermore, certain features, structures, or characteristics of one or more embodiments of the present application may be combined as suitable.

The unit body assembling method and the unit body disassembling method according to one or more embodiments of the present invention are used for assembling and disassembling the unit body 1 of an aircraft engine.

Referring to fig. 1 and 2, in one embodiment, the unit body 1 includes a first casing 10, a second casing 20, a rotor shaft 30, a bearing 40, a bolt 50, and a nut 60. For example, the second casing 20 is a combustion chamber stator casing, and the first casing 10 is a bearing casing adjacent to the combustion chamber stator casing. The first casing 10 and the second casing 20 are sleeved on the radially outer side of the rotor shaft 30. The first casing 10 is rotatably connected to the rotor shaft 30 by a bearing 40.

The bearing 40 includes an outer ring 41, an inner ring 42, rolling elements 43, and a cage 44. The bearing 40 is a ball bearing and the rolling elements 43 are balls to transmit both axial and radial loads. The outer ring 41 includes axially opposite first and second ends 411, 412, wherein the first end 411 is the end proximal to the second casing 20. The inner ring 42 includes axially adjacent first and second half rings 421 and 422. The first half ring 421 includes a first outer end 4211 and a first inner end 4212, the first outer end 4211 being aligned with the first end 411 of the outer ring 41, the first inner end 4212 being adjacent to the second half ring 422.

The first casing 10 includes a first mounting edge 11 extending in a circumferential direction, and the first mounting edge 11 includes a plurality of first mounting holes 12 distributed in the circumferential direction. The second casing 20 includes a second mounting edge 21 extending in a circumferential direction, and the second mounting edge 21 includes a plurality of second mounting holes 22 distributed in the circumferential direction. The first mounting holes 12 are in one-to-one correspondence with the second mounting holes 22, and bolts 50 pass through the first mounting holes 12 and the second mounting holes 22 and are screw-engaged with nuts 60 to connect and fix the first casing 10 with the second casing 20.

The radial inner side of the first casing 10 is provided with a first air seal stator ring 13, a first lubricating oil seal stator ring 14, a bearing seat 15, a second lubricating oil seal stator ring 16 and a second air seal stator ring 17 in sequence along the axial direction. The bearing housing 15 is used to mount an outer ring 41 of the bearing 40. The first air seal stator ring 13 and the first oil seal stator ring 14 are located between the bearing 40 and the second casing 20.

An air seal rotor ring 31, a lubricating oil seal rotor ring 32, an oil slinger 33 and a gland nut 34 are sequentially arranged on the radially outer side of the rotor shaft 30 in the axial direction. The air seal rotor ring 31, the oil seal rotor ring 32 and the oil slinger 33 are located between the bearing 40 and the second casing 20. The oil slinger 33 and the packing nut 34 are located on either axial side of the bearing 40.

The air seal rotor ring 31 is adapted to cooperate with the first air seal stator ring 13. The oil seal rotor ring 32 is adapted to mate with the first oil seal stator ring 14. The oil slinger 33 is located between the bearing 40 and the first oil seal stator ring 14 with some axial clearance from the first oil seal stator ring 14. Adjacent to the second half 422 is a compression nut 34 for compressing the inner ring 42 of the bearing 40.

Referring to fig. 3, the unit body assembling method according to an embodiment of the present invention includes the steps of:

1. the second casing 20 is mounted on the radial outer side of the rotor shaft 30, the second casing 20 and the rotor shaft 30 are vertically supported on an assembly seat (not shown), the first air seal stator ring 13, the first oil seal stator ring 14 and the bearing seat 15 are mounted on the radial inner side of the first casing 10, and the outer ring 41 of the bearing 40 is mounted on the bearing seat 15 to form a first casing component assembly;

2. connecting a lifting device to the first casing 10, the lifting device comprising, for example, a crane and a casing spreader, lifting the first casing 10 using the lifting device, moving the first casing 10 over the second casing 20 and the rotor shaft 30;

3. aligning the center of the first casing 10 with the center of the rotor shaft 30, slowly dropping the first casing 10 onto the second casing 20 by a lifting device and sleeving the first casing 10 on the radial outer side of the rotor shaft 30, and connecting the first casing 10 with the second casing 20 by a bolt 50 and a nut 60 to tightly attach the first casing 10 with the second casing 20 so as to measure a set distance D; for convenience of operation, the bolts 50 and nuts 60 may be installed in only a portion of the first and second installation holes 12 and 22, for example, four sets of bolts 50 and nuts 60 may be installed, and the four sets of bolts 50 and nuts 60 may be uniformly or nearly uniformly arranged in the circumferential directions of the first and second cases 10 and 20;

4. the oil slinger 33 is heated by a resistance furnace, mounted radially outside the rotor shaft 30, and is secured in place by measuring the axial dimension;

5. heating the first half ring 421 using an electric resistance furnace, mounting it radially outside the rotor shaft 30, ensuring the fitting in place by measuring the axial dimensions, while the first outer end 4211 of the first half ring 421 is aligned with the first end 411 of the outer ring 41, the opening formed between the second end 412 of the outer ring 41 and the first inner end 4212 of the first half ring 421 being small, and the rolling elements 43 and the cage 44 being not able to pass through;

6. unscrewing the nut 60, adjusting and measuring the unscrewed distance of the nut 60 by using a vernier caliper, and moving the nut 60 to a set distance D relative to the bolt 50;

7. lifting the first casing 10 by a lifting device, so that the first casing 10 moves upwards until the head of the bolt 50 and the nut 60 respectively prop against one of the first casing 10 and the second casing 20, at this time, the first casing 10 drives the outer ring 41 to move upwards by a set distance D, the first end 411 of the outer ring 41 is axially staggered with the first outer end 4211 of the first half ring 421, and the opening between the second end 412 and the first inner end 4212 is increased, so that the rolling elements 43 and the retainer 44 can be allowed to pass through;

8. combining the rolling elements 43 and the cage 44, and installing the rolling elements 43 and the cage 44 between the outer ring 41 and the first half ring 421 from the opening between the second end 412 and the first inner end 4212 so that the rolling elements 43 and the cage 44 smoothly enter the runway of the first half ring 421;

9. slowly dropping the first casing 10 through a lifting device, dropping the first casing 10 onto the second casing 20 again, screwing the unscrewed nut 60 in the step 6, and installing the rest bolts 50 and nuts 60 to complete the connection of the first casing 10 and the second casing 20;

10. the second half-ring 422 is heated using a resistance furnace, mounted radially outside the rotor shaft 30, secured in place by measuring the axial dimensions;

11. a compression nut 34 is installed, and a second lubricating oil seal stator ring 16 and a second air seal stator ring 17 are installed.

The value of the aforementioned set distance D is selected according to the specifications of the relevant parts of the unit body 1 to be assembled, and is generally not less than 3mm and not more than 10mm. The set distance D is selected by considering the opening size required for installing the rolling elements 43 and the retainer 44 of the bearing 40 of the corresponding specification, and also considering the axial clearance between the first oil seal stator ring 14 and the oil slinger 33, so as to avoid the collision scratch or interference between the first oil seal stator ring 14 and the oil slinger 33 when the first casing 10 moves upwards.

Optionally, the lifting device further includes a hanging scale, and the foregoing step 2 further includes: clearing the hanging balance, connecting the hanging balance to the first casing 10, and reading a first reading G through the hanging balance, wherein the first reading G is the mass of the first casing component assembly in the step 1; the foregoing step 7 further includes: when the first casing 10 is lifted by the lifting device, the reading of the hanging scale is observed, and when the reading of the hanging scale is not smaller than (G+20 Kg) and not larger than (G+50 Kg), lifting is stopped, so that the distance that the first casing 10 drives the outer ring 41 to move upwards can be ensured to reach the set distance D, and the first casing 10 drives the second casing 20 to lift due to excessive lifting can be avoided.

In other embodiments, the axial movement of the first casing 10 relative to the second casing 20 and the rotor shaft 30 is achieved by other lifting devices.

The unit body assembling method breaks through the traditional assembling method, breaks through the solidified assembling habit, and through the fact that the rolling bodies 43 and the retainer 44 of the bearing 40 are assembled with the outer ring 41 separately, the first half ring 421, the rolling bodies 43 and the retainer 44 of the bearing 40, the oil slinger 33 and other rotor parts are assembled in the whole machine assembling stage, namely the final assembly stage, the situation that the inner ring 42, the oil slinger 33 and other stator parts are knocked or scratched by stator sealing rings and other stator parts arranged on the radial inner side of the first casing 10 in the assembling process can be effectively avoided, and the bearing 40 cannot be assembled or interfered due to the size of the stator parts on the radial inner side of the first casing 10 is avoided, so that the unit body assembling method has a large application range. The assembling method of the unit body is ingenious and reasonable in design, simple to operate and low in assembling risk, the assembling quality can be improved, the existing general tools and equipment are adopted in the assembling process, additional tools are not needed to be designed, manufactured and managed, further resource input can be avoided, and the cost is low. The unit body assembling method opens up a new idea for the assembly of the aero-engine, and is not only suitable for the assembly of engine test pieces, but also suitable for the assembly of single-rotor engines.

Referring to fig. 4, the unit body decomposition method according to an embodiment of the present invention includes the steps of:

I. placing the unit body 1 vertically;

II. Removing the second air seal stator ring 17, the second oil seal stator ring 16, and the compression nut 34, and removing the second half ring 422 from the rotor shaft 30 through the drawing groove of the second half ring 422 by using a puller;

III, removing part of the bolts 50 and the corresponding nuts 60, only reserving four groups of bolts 50 and nuts 60 uniformly distributed or nearly uniformly distributed in the circumferential direction of the first casing 10 and the second casing 20, unscrewing the nuts 60 therein, adjusting and measuring the unscrewed distance of the nuts 60 by using a vernier caliper, and moving the nuts 60 to a set distance D relative to the bolts 50, wherein the value of the set distance D is selected as described above;

IV, connecting a lifting device to the first casing 10, wherein the lifting device comprises a crane and a casing lifting appliance, the first casing 10 is lifted by the lifting device, the first casing 10 moves upwards until the head of a bolt 50 and a nut 60 respectively abut against one of the first casing 10 and the second casing 20, at the moment, the first casing 10 drives an outer ring 41 to move upwards by a set distance D, a first end 411 of the outer ring 41 is axially staggered with a first outer end 4211 of a first half ring 421, and an opening between a second end 412 of the outer ring 41 and a first inner end 4212 of the first half ring 421 is enlarged, so that the rolling bodies 43 and the retainer 44 can be allowed to pass through;

v, wearing rubber protective gloves, rolling elements 43 and cage 44 can be removed by hand through the opening between second end 412 and first inner end 4212;

VI, slowly falling the first casing 10 through a lifting device, so that the first casing 10 falls onto the second casing 20 again;

VII, removing the first semi-ring 421 by using a puller, and removing the oil slinger 33;

VIII, disassembling the rest of the bolts 50 and nuts 60, disassembling the first casing 10 and the second casing 20, and removing the first casing 10 from above the second casing 20 and the rotor shaft 30 by a hoisting device;

IX, the second casing 20 and the rotor shaft 30 are disassembled, and the assembly of the respective components is disassembled.

Optionally, the lifting device further includes a hanging scale, and the step IV further includes: when the first casing 10 is lifted by the lifting device, the reading of the hanging scale is observed, and when the reading of the hanging scale is not smaller than (G+20 Kg) and not larger than (G+50 Kg), lifting is stopped, so that the distance that the first casing 10 drives the outer ring 41 to move upwards can be ensured to reach the set distance D, and the first casing 10 drives the second casing 20 to lift due to excessive lifting can be avoided. Wherein G is the mass of the first casing part assembly, and the value of G can be measured in the assembly process or calculated according to the design mass of each part.

In other embodiments, the axial movement of the first casing 10 relative to the second casing 20 and the rotor shaft 30 is achieved by other lifting devices.

The unit body decomposition method breaks through the traditional decomposition method, breaks through the solidification decomposition habit, separates the rolling elements 43 and the retainer 44 of the bearing 40 from the outer ring 41, and changes the first half ring 421, the rolling elements 43 and the retainer 44 of the bearing 40, the oil slinger 33 and other rotor parts into decomposition before decomposing the unit body 1 into the assembly of each part, so that the inner ring 42, the oil slinger 33 and other stator parts such as a stator sealing ring arranged on the radial inner side of the first casing 10 can be effectively prevented from being knocked or scratched in the decomposition process, and the bearing 40 cannot be decomposed or interfered due to the size of the stator parts on the radial inner side of the first casing 10 is prevented, and the unit body decomposition method has a larger application range. The unit body decomposition method is ingenious and reasonable in design, simple to operate, low in decomposition risk, capable of improving the decomposition quality, and low in cost, and the decomposition process is achieved by adopting existing general tools and equipment completely, so that additional tools are not required to be designed, manufactured and managed, further resource investment can be avoided, and cost is low. The unit body decomposition method opens up a new idea for the decomposition of the aeroengine, and is not only suitable for the decomposition of the engine test piece, but also suitable for the decomposition of the single-rotor engine.

In other embodiments, the unit body includes only the first casing 10 and the rotor shaft 30, does not include the second casing 20, and correspondingly adjusts part of the operation steps of the foregoing unit body assembling method and unit body disassembling method.

As can be understood from the above description of the unit body assembling method, the bearing assembling method according to one embodiment is for assembling the aforementioned bearing 40, comprising the steps of:

1) Mounting the outer ring 41 of the bearing 40 to a first workpiece (e.g., the first casing 10), and mounting the first half ring 421 of the bearing 40 to a second workpiece (e.g., the rotor shaft 30);

2) The first workpiece is sleeved outside the second workpiece, so that the first end 411 of the outer ring 41 is axially staggered from the first outer end 4211 of the first half ring 421, and the opening formed between the second end 412 of the outer ring 41 and the first inner end 4212 of the first half ring 421 is increased;

3) The rolling elements 43 and the retainer 44 are fitted between the outer ring 41 and the first half ring 421 from the opening, so that the rolling elements 43 and the retainer 44 smoothly enter the race of the first half ring 421;

4) Axially moving the first workpiece or/and the second workpiece such that the first end 411 of the outer ring 41 is aligned with the first outer end 4211 of the first half ring 421;

5) The second half 422 is mounted.

The bearing assembly method breaks through the traditional assembly method, breaks through the solidified assembly habit, can effectively avoid the collision or scratch of the inner ring 42 by the parts arranged on the inner side of the first workpiece in the assembly process by assembling the rolling bodies 43 and the retainer 44 of the bearing 40 and the outer ring 41 separately, and avoids the incapability of assembling or interference of the bearing 40 due to the size of the parts on the inner side of the first workpiece, thereby having a larger application range. The bearing assembly method is ingenious and reasonable in design, simple to operate and low in assembly risk, the assembly quality can be improved, the existing general tools and equipment are adopted in the assembly process, additional tools are not required to be designed, manufactured and managed, further input of resources can be avoided, the cost is low, a new idea is developed for assembly of the bearing, and the bearing assembly method is suitable for assembly of the bearing 40 and assembly of bearings installed at other positions.

As can be understood from the above description of the unit body decomposition method, the bearing decomposition method according to one embodiment is for decomposing the aforementioned bearing 40, and includes the steps of:

i) Removing the second half 422;

II) axially displacing the first workpiece or/and the second workpiece such that the first end 411 of the outer ring 41 is axially offset from the first outer end 4211 of the first half ring 421 to enlarge the opening formed between the second end 412 of the outer ring 41 and the first inner end 4212 of the first half ring 421;

III) the rolling elements 43 and the cage 44 are removed from the opening;

IV) removing the outer ring 41 and the first half ring 421.

The bearing decomposition method breaks through the traditional decomposition method, breaks through the solidification decomposition habit, and can effectively avoid the collision or scratch of the inner ring 42 by the parts arranged on the inner side of the first workpiece in the decomposition process by separating the rolling body 43 and the retainer 44 of the bearing 40 from the outer ring 41, thereby avoiding the incapability of decomposing or interfering the bearing 40 due to the size of the parts on the inner side of the first workpiece, and having a larger application range. The bearing decomposition method is ingenious and reasonable in design, simple to operate and low in decomposition risk, the decomposition quality can be improved, the existing general tools and equipment are adopted in the decomposition process, additional tools are not required to be designed, manufactured and managed, further input of resources can be avoided, the cost is low, a new idea is developed for bearing decomposition, and the bearing decomposition method is suitable for bearing 40 decomposition and bearing decomposition installed at other positions.

While the invention has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the invention, as will occur to those skilled in the art, without departing from the spirit and scope of the invention. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention fall within the protection scope defined by the claims of the present invention.

Claims (10)

1. Bearing assembly method, the bearing comprising an outer ring, an inner ring, rolling bodies and a cage, the outer ring comprising axially opposite first and second ends, the inner ring comprising axially adjacent first and second half rings, the first half ring comprising a first outer end and a first inner end, the first outer end being aligned with the first end, the first inner end being adjacent to the second half ring, the bearing assembly method comprising the steps of:

the outer ring is arranged on a first workpiece, the first half ring is arranged on a second workpiece, the first workpiece is sleeved on the outer side of the second workpiece, and the first end and the first outer end are staggered in the axial direction so as to enlarge an opening formed between the second end and the first inner end;

installing the rolling bodies and the cage from the opening between the outer ring and the first half ring;

axially moving the first workpiece or/and the second workpiece to align the first end with the first outer end;

and installing the second semi-ring.

2. A bearing split method, the bearing being mounted between a first workpiece and a second workpiece, the bearing comprising an outer ring, an inner ring, rolling bodies and a cage, the outer ring comprising axially opposed first and second ends, the inner ring comprising axially adjacent first and second half rings, the first half ring comprising a first outer end and a first inner end, the first outer end being aligned with the first end and the first inner end being adjacent the second half ring, the bearing split method comprising the steps of:

removing the second half ring;

moving the first workpiece or/and the second workpiece axially so that the first end is axially offset from the first outer end to enlarge the opening formed between the second end and the first inner end;

removing the rolling elements and the cage from the opening;

the outer ring and the first half ring are removed.

3. A method of assembling a unit body, the unit body being a unit body of an aircraft engine comprising a first casing and a rotor shaft, the method comprising the method of assembling a bearing according to claim 1, the first casing providing the first workpiece and the rotor shaft providing the second workpiece.

4. A unit body assembling method according to claim 3, wherein the unit body further includes a second casing, the unit body assembling method comprising:

mounting the second casing radially outward of the rotor shaft, vertically positioning the second casing and the rotor shaft, and mounting the outer ring to the first casing;

moving the first casing to above the second casing and the rotor shaft;

the first casing is dropped onto the second casing and sleeved on the radial outer side of the rotor shaft, and the first casing is connected with the second casing through bolts and nuts;

mounting the first half ring radially outward of the rotor shaft;

unscrewing the nut to move the nut to a set distance relative to the bolt;

moving the first casing upwards until the bolt and the nut respectively abut against one of the first casing and the second casing;

mounting the rolling bodies and the cage;

and the first casing is fallen onto the second casing, the nut is screwed down, and the second semi-ring is installed.

5. The unit body assembling method according to claim 4, wherein the unit body assembling method further comprises: connecting a lifting device to the first casing, the lifting device comprising a crane scale; reading a first reading G by the hanging scale before the first casing is dropped to the second casing; after the nut is moved to the set distance, the first casing is lifted by the lifting device, and lifting is stopped when the reading of the hanging scale is not less than (G+20 Kg) and not more than (G+50 Kg).

6. The method of assembling a unit cell of claim 4, wherein the unit cell further comprises a rotor member and a stator member, wherein:

the stator piece is arranged on the radial inner side of the first casing and is positioned between the bearing and the second casing;

the rotor piece is arranged on the radial outer side of the rotor shaft and is positioned between the bearing and the stator piece;

the unit body assembling method further comprises the following steps: the rotor member is mounted to the rotor shaft after the first casing is lowered to the second casing and before the first half ring is mounted.

7. A unit body decomposition method, wherein the unit body is a unit body of an aeroengine and comprises a first casing and a rotor shaft, and the unit body decomposition method comprises the bearing decomposition method according to claim 2, the first casing provides the first workpiece, and the rotor shaft provides the second workpiece.

8. The unit body decomposition method according to claim 7, wherein the unit body further includes a second casing connected to the first casing by a bolt and a nut, the unit body decomposition method comprising:

placing the unit body vertically;

removing the second half ring;

unscrewing the nut to move the nut to a set distance relative to the bolt;

moving the first casing upwards until the bolt and the nut respectively abut against one of the first casing and the second casing;

removing the rolling bodies and the cage;

the first casing is dropped onto the second casing, and the first semi-ring is removed;

and decomposing the first casing and the second casing, and removing the first casing from the upper parts of the second casing and the rotor shaft.

9. The cell body decomposing method as claimed in claim 8, wherein said cell body decomposing method further comprises: connecting a lifting device to the first casing, the lifting device comprising a crane scale; after the nut is moved to the set distance, lifting the first casing by the lifting device, and stopping lifting when the reading of the hanging scale is not less than (G+20 Kg) and not more than (G+50 Kg), wherein G is the mass of the component assembly including the first casing.

10. The method of unitizing of claim 8, wherein the unitizing element further comprises a rotor piece and a stator piece, wherein:

the stator piece is arranged on the radial inner side of the first casing and is positioned between the bearing and the second casing;

the rotor piece is arranged on the radial outer side of the rotor shaft and is positioned between the bearing and the stator piece;

the unit body decomposition method further comprises the following steps: the rotor piece is removed from the rotor shaft after removing the first half ring and before decomposing the first casing and the second casing.