A wavy bearing spline lock ring mechanism for an aeroengine

Abstract

The present invention relates to the field of aero-engines, and particularly to a wavy bearing spline lock ring mechanism for an aero-engine, which includes a drive shaft, a bearing, a casing, an impeller disk, a nut, a transmission gear sleeve and a wavy spline lock ring. A wavy bearing spline lock ring is added between the transmission gear sleeve and the bearing to achieve an adjustable effect. Specifically, it can produce elastic deformation when subjected to axial pressure, and can prevent loosening of the parts in contact with it. After the present invention, a certain clearance is ensured between the impeller disk blades and the casing, and there will be no interference between the blades and the casing during operation; the transmission gear sleeve and the outer ring of the bearing can be effectively avoided and there will be no friction; between the transmission gear sleeve and the inner ring of the bearing, through the tension constraint of the wavy bearing spline lock ring, they can be tightly connected, the transmission gear sleeve will not move around, and the service life is improved.

Description

Technical Field

[0001] The invention relates to the field of aeroengines, and in particular to a wave-shaped bearing spline locking ring mechanism for an aeroengine. Background Art

[0002] In the transmission system of a certain type of aircraft engine, a transmission shaft is used with a spline on its end face for power transmission, and the transmission shaft is supported by a bearing. During assembly, it is necessary to ensure that the inner and outer tooth positions of the transmission shaft and the transmission sleeve spline are correct; it is also necessary to ensure that the transmission sleeve and the bearing are tightly matched axially without interference. The inner and outer splines in the circumference are 6 evenly distributed staggered tooth structures; the axial direction is a tight fit between the bearing and the spline end of the transmission shaft. The bearing has a fixed installation position in the casing and cannot be moved. After the impeller disk is installed on the transmission sleeve, there is a gap of 0.6mm between the impeller disk blades and the end face of the casing. If the distance between the blades and the end face of the casing is guaranteed, there must be a certain gap between the spline end face and the bearing or interference with the bearing, resulting in uncontrollable state of the transmission sleeve during assembly or operation. Summary of the invention

[0003] The purpose of the present invention is to provide a wave-shaped bearing spline lock ring mechanism for an aircraft engine, aiming to improve the assembly qualification rate of the entire engine and reduce the noise generated by the assembly gap.

[0004] To achieve the above-mentioned objectives, in a first aspect, the present invention provides an aircraft engine wavy bearing spline locking ring mechanism, comprising a transmission shaft, a bearing, a casing, an impeller disk, a nut, a transmission gear sleeve and a wavy spline locking ring, wherein the outer ring of the bearing is fixedly connected to the casing and is located on one side of the casing, the inner ring of the bearing is fixedly connected to the transmission shaft, the transmission shaft passes through the inner ring of the bearing, the transmission shaft has an external spline and a mounting thread, the mounting thread is located on one side of the external spline, the transmission gear sleeve is sleeved on the external spline, the wavy spline locking ring is sleeved between the transmission rack and the inner ring of the bearing, the wavy spline locking ring is wavy, the nut is connected to the mounting thread of the transmission shaft, and the impeller disk is fixed on the transmission gear sleeve.

[0005] Wherein, the aircraft engine wave-shaped bearing spline locking ring mechanism also includes a lubrication structure, and the lubrication structure is arranged on one side of the bearing.

[0006] Among them, the lubrication structure includes a nozzle, an oil collecting tank, a circulation channel and a filter. The nozzle is arranged on the outside of the casing and is connected to the oil supply tank and is close to the bearing. The oil collecting tank is fixedly connected to the casing and is located on the inside of the casing. The circulation channel is connected to the oil collecting tank. The filter is connected to the circulation channel and connected to the oil supply tank.

[0007] Among them, the wavy bearing spline lock ring mechanism of the aero-engine further includes a sealing structure, and the sealing structure is arranged on one side of the bearing.

[0008] Among them, the sealing structure includes a dynamic seal and a sealing ring. The sealing ring is arranged between the transmission gear sleeve and the transmission shaft, and the dynamic seal is arranged on the side of the bearing close to the nozzle.

[0009] Among them, the wavy bearing spline lock ring mechanism of the aero-engine further includes a monitoring structure, and the monitoring structure is arranged in the casing for monitoring the running vibration and noise.

[0010] In a second aspect, the present invention also provides an assembling method for a wavy bearing spline lock ring mechanism of an aero-engine, including: assembling the impeller disk on the transmission gear sleeve in an interference fit manner;

[0011] assembling the transmission shaft and the bearing by interference fit;

[0012] installing the bearing in the casing;

[0013] slipping the wavy bearing spline lock ring onto the transmission shaft and pushing it against the bearing;

[0014] connecting the transmission gear sleeve to the transmission shaft through splines and pushing it to the wavy bearing spline lock ring;

[0015] turning the nut to apply axial pressure to the transmission gear sleeve, forcing the wavy bearing spline lock ring to undergo elastic deformation and be in a compressed state; measuring the distance between the impeller disk blades and the casing until the clearance of 0.6 mm between the impeller disk blades and the casing is satisfied, stopping turning the nut, and fixing the nut in the current position.

[0016] In the wavy bearing spline lock ring mechanism of an aero-engine of the present invention, a wavy bearing spline lock ring is added between the transmission gear sleeve and the bearing. The inner hole of this lock ring is made to be the same shape as the spline, and the outer circle needs to avoid the working parts of the bearing and the transmission gear sleeve to prevent interference. The end face is designed as a wavy shape evenly distributed at 6 places along the circumference to achieve an adjustable effect. When it is subjected to axial pressure, it can produce elastic deformation, which can prevent loosening of the parts in contact with it. After the present invention, a certain clearance is ensured between the impeller disk blades and the casing, and the blades and the casing will not interfere during operation; the transmission gear sleeve and the outer ring of the bearing can be effectively avoided and will not generate friction; between the transmission gear sleeve and the inner ring of the bearing, through the tension constraint of the wavy bearing spline lock ring, they can be tightly connected, the transmission gear sleeve will not move axially, and the service life is improved.

[0017] The present invention solves the problem that in the transmission process of an aero-engine, if there is a gap between the transmission gear sleeve and the inner ring of the bearing, the transmission gear sleeve will move axially on the bearing and generate noise;

[0018] 2) It solves the problem that in the transmission process of an aero-engine, if there is no clearance and tight fit between the transmission gear sleeve and the inner ring of the bearing, interference and wear will occur between the transmission gear sleeve and the outer ring of the bearing, reducing the service life.

[0019] 3) It solves the problem that if the clearance between the blades of the impeller disk and the end face of the casing cannot be guaranteed, interference or friction will occur between the blades of the impeller disk and the casing, causing the entire engine to fail to work.

[0020] The purpose of the present invention is to improve the assembly qualification rate of the entire engine and reduce the noise generated due to assembly clearances; the present invention can effectively adjust the optimal state of the assembly between various related components, thereby increasing the service life of the engine; the present invention reduces or eliminates the situation where the engine fails to work due to unreasonable assembly between the transmission gear sleeve and the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a structural diagram of a wavy bearing spline lock ring mechanism of an aero-engine according to the first embodiment of the present invention.

[0023] Figure 2 It is a front view structure and a side view structure diagram of the wavy spline lock ring according to the first embodiment of the present invention.

[0024] Figure 3 It is a partial structural diagram of a wavy bearing spline lock ring mechanism of an aero-engine according to the first embodiment of the present invention.

[0025] Figure 4 It is a structural diagram of a wavy bearing spline lock ring mechanism of an aero-engine according to the second embodiment of the present invention.

[0026] Figure 5 It is a diagram of the assembly method of a wavy bearing spline lock ring mechanism of an aero-engine according to the third embodiment of the present invention.

[0027] 101 - Transmission shaft, 102 - Bearing, 103 - Casing, 104 - Impeller disc, 105 - Nut, 106 - Transmission gear sleeve, 107 - Wavy spline lock ring, 108 - External spline, 109 - Installation thread, 201 - Lubrication structure, 202 - Nozzle, 203 - Oil sump, 204 - Circulation channel, 205 - Filter, 206 - Sealing structure, 207 - Dynamic seal, 208 - Sealing ring, 209 - Monitoring structure, 210 - Vibration monitor, 211 - Microphone, 212 - Distance sensor. Detailed implementation manners

[0028] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0029] Please refer to Figures 1 to 3 , Figure 1 which is a structural diagram of a wavy bearing spline lock ring mechanism of an aero - engine according to the first embodiment of the present invention. Figure 2 which is a front - view structure and a side - view structure diagram of the wavy spline lock ring according to the first embodiment of the present invention. Figure 3 which is a partial structural diagram of a wavy bearing spline lock ring mechanism of an aero - engine according to the first embodiment of the present invention.

[0030] The present invention provides a wavy bearing 102 spline lock ring mechanism for an aero - engine:

[0031] It includes a transmission shaft 101, a bearing 102, a casing 103, an impeller disc 104, a nut 105, a transmission gear sleeve 106, and a wavy spline lock ring 107. The outer ring of the bearing 102 is fixedly connected to the casing 103 and is located on one side of the casing 103. The inner ring of the bearing 102 is fixedly connected to the transmission shaft 101. The transmission shaft 101 passes through the inner ring of the bearing 102. The transmission shaft 101 has an external spline 108 and an installation thread 109. The installation thread 109 is located on one side of the external spline 108. The transmission gear sleeve 106 is sleeved on the external spline 108. The wavy spline lock ring 107 is sleeved between the transmission gear and the inner ring of the bearing 102. The wavy spline lock ring 107 is wavy. The nut 105 is connected to the installation thread 109 of the transmission shaft 101. The impeller disc 104 is fixed on the transmission gear sleeve 106.

[0032] In this embodiment, a wavy bearing 102 spline lock ring is added between the transmission gear sleeve 106 and the bearing 102. The inner hole of this lock ring is made to be the same shape as the spline, and the outer circle needs to avoid the working parts of the bearing 102 and the transmission gear sleeve 106 to prevent interference. The end face is designed to be a wavy shape evenly distributed circumferentially at 6 places to achieve an adjustable effect. It can produce elastic deformation when subjected to axial pressure, and can prevent loosening of the parts in contact with it. After the present invention, a certain gap is ensured between the blades of the impeller disk 104 and the casing 103, and the blades and the casing 103 will not interfere during operation; the transmission gear sleeve 106 and the outer ring of the bearing 102 can be effectively avoided and will not generate friction; between the transmission gear sleeve 106 and the inner ring of the bearing 102, through the tension constraint of the wavy bearing 102 spline lock ring, they can be tightly connected, the transmission gear sleeve 106 will not move axially, and the service life is improved.

[0033] The present invention solves the problem that during the transmission process of an aeroengine, if there is a gap between the transmission gear sleeve 106 and the inner ring of the bearing 102, the transmission gear sleeve 106 will move axially on the bearing 102 and generate noise.

[0034] 2) Solves the problem that during the transmission process of an aeroengine, if there is no gap and tight fit between the transmission gear sleeve 106 and the inner ring of the bearing 102, it will cause interference and wear between the transmission gear sleeve 106 and the outer ring of the bearing 102, and the service life will be reduced.

[0035] 3) Solves the problem that if the gap between the blades of the impeller disk 104 and the end face of the casing 103 cannot be ensured, it will cause interference or friction between the blades of the impeller disk 104 and the casing 103, resulting in the entire engine being unable to work.

[0036] The purpose of the present invention is to improve the assembly qualification rate of the entire engine and reduce the noise generated due to assembly gaps; the present invention can effectively adjust the optimal state of the assembly between various related components, thereby improving the service life of the engine; the present invention reduces or eliminates the situation where the engine does not work due to unreasonable assembly between the transmission gear sleeve 106 and the bearing 102.

[0037] Second Embodiment

[0038] Please refer to Figure 4 , Figure 4 which is a structural diagram of a wavy bearing spline lock ring mechanism of an aeroengine according to the second embodiment of the present invention. On the basis of the first embodiment, the present invention also provides a wavy bearing 102 spline lock ring mechanism for an aeroengine. The wavy bearing 102 spline lock ring mechanism for an aeroengine further includes a lubrication structure 201, and the lubrication structure 201 is arranged on one side of the bearing 102. Through the lubrication structure 201, lubricating oil can be provided to the operating bearing 102, which can reduce friction and cool down at the same time.

[0039] In this embodiment, the lubrication structure 201 includes a nozzle 202, an oil sump 203, a circulation passage 204, and a filter 205. The nozzle 202 is disposed outside the casing 103, communicates with an oil supply tank, and is close to the bearing 102. The oil sump 203 is fixedly connected to the casing 103 and is located inside the casing 103. The circulation passage 204 is connected to the oil sump 203, and the filter 205 is connected to the circulation passage 204 and is also connected to the oil supply tank. The connection between the nozzle 202 and the oil supply tank enables the lubricating oil to be ejected under the pressure generated by the oil supply tank and enter the bearing 102. Then, the lubricating oil is thrown out by the high-speed rotation of the inner ring of the bearing 102 into the oil sump 203, and can flow back to the oil supply tank through the circulation passage 204. The filter 205 can filter impurities in the lubricating oil, making it more convenient to use.

[0040] Among them, the spline lock ring mechanism of the wavy bearing 102 of the aeroengine further includes a sealing structure 206, which is disposed on one side of the bearing 102. The sealing structure 206 can prevent the leakage of lubricating oil during operation, making it safer to use.

[0041] Secondly, the sealing structure 206 includes a dynamic seal 207 and a sealing ring 208. The sealing ring 208 is disposed between the transmission gear sleeve 106 and the transmission shaft 101, and the dynamic seal 207 is disposed on the side of the bearing 102 close to the nozzle 202. The dynamic seal 207 disposed on one side of the nozzle 202 can prevent the leakage of lubricating oil on the oil supply side, and the sealing ring 208 disposed on the side of the nut 105 can prevent the leakage of lubricating oil on the nut 105 side.

[0042] Then, the spline lock ring mechanism of the wavy bearing 102 of the aeroengine further includes a monitoring structure 209, which is disposed inside the casing 103 and is used to monitor the operating vibration and noise. When abnormal vibration and noise occur, an alarm can be issued through the monitoring structure 209, making it more convenient to use.

[0043] Finally, the monitoring structure 209 includes a vibration monitor 210, a microphone 211, and a distance sensor 212. The vibration monitor 210 and the microphone 211 are disposed inside the casing 103, and the distance sensor 212 is disposed on the side close to the impeller disk 104. The vibration monitor 210 can detect the vibration condition of the casing 103 to obtain a vibration signal. Whether the vibration signal is within a reasonable range can be judged through historical data. If not, it indicates that a fault has occurred. In addition, the microphone 211 can also receive the sound during operation, and the fault can also be judged through the sound signal.

[0044] After the transmission shaft 101 operates for a long time, the wavy spline lock ring 107 may undergo slight deformation and become ineffective, which will cause changes in the gap between the impeller disc 104 and the casing 103. Therefore, the distance sensor 212 is provided to detect the position of the impeller disc 104, so that the operation of the entire device can be more conveniently known and timely response can be made.

[0045] The third embodiment

[0046] Please refer to Figure 5 , Figure 5 is an assembly method diagram of a wavy bearing spline lock ring mechanism of an aeroengine according to the third embodiment of the present invention. On the basis of the first embodiment, the present invention further provides an assembly method of a wavy bearing 102 spline lock ring mechanism of an aeroengine, including:

[0047] S101 Assemble the impeller disc 104 onto the transmission gear sleeve 106 in an interference fit manner;

[0048] S102 Assemble the transmission shaft 101 and the bearing 102 in an interference fit;

[0049] S103 Install the bearing 102 in the casing 103;

[0050] S104 Slip the wavy bearing 102 spline lock ring onto the transmission shaft 101 and push it against the bearing 102;

[0051] S105 Connect the transmission gear sleeve 106 to the transmission shaft 101 through splines and push it to the wavy bearing 102 spline lock ring;

[0052] S106 Turn the nut 105 to apply axial pressure to the transmission gear sleeve 106, forcing the wavy bearing 102 spline lock ring to undergo elastic deformation and be in a compressed state; measure the distance between the blades of the impeller disc 104 and the casing 103 until the gap of 0.6 mm between the blades of the impeller disc 104 and the casing 103 is satisfied, stop turning the nut 105, and fix the nut 105 in the current position.

[0053] The purpose of the present invention is to improve the assembly qualification rate of the entire engine and reduce the noise generated due to assembly gaps; the present invention can effectively adjust the optimal state of the assembly between relevant components, thereby improving the service life of the engine; the present invention reduces or eliminates the engine failure caused by unreasonable assembly between the transmission gear sleeve 106 and the bearing 102.

[0054] The above-disclosed is only a preferred embodiment of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. A wavy bearing spline lock ring mechanism for an aeroengine, comprising a drive shaft, a bearing, a casing, an impeller disc, a nut and a transmission gear sleeve, characterized in that, it further comprises a wavy spline lock ring. The outer ring of the bearing is fixedly connected to the casing and is located on one side of the casing. The inner ring of the bearing is fixedly connected to the drive shaft. The drive shaft passes through the inner ring of the bearing. The drive shaft has an external spline and a mounting thread, and the mounting thread is located on one side of the external spline. The transmission gear sleeve is sleeved on the external spline. The wavy spline lock ring is sleeved between the transmission gear sleeve and the inner ring of the bearing. The wavy spline lock ring is wavy. The nut is connected to the mounting thread of the drive shaft, and the impeller disc is fixed on the transmission gear sleeve. The wavy bearing spline lock ring mechanism for the aeroengine further comprises a monitoring structure, which is arranged in the casing and is used for monitoring the running vibration and noise. The monitoring structure comprises a vibration monitor, a microphone and a distance sensor. The vibration monitor and the microphone are arranged on the inner side of the casing, and the distance sensor is arranged on one side close to the impeller disc.

2. The wavy bearing spline lock ring mechanism for an aeroengine according to claim 1, characterized in that, the wavy bearing spline lock ring mechanism for the aeroengine further comprises a lubrication structure, which is arranged on one side of the bearing.

3. The wavy bearing spline lock ring mechanism for an aeroengine according to claim 2, characterized in that, the lubrication structure comprises a nozzle, an oil sump, a circulation channel and a filter. The nozzle is arranged on the outer side of the casing, is communicated with an oil supply tank and is close to the bearing. The oil sump is fixedly connected to the casing and is located inside the casing. The circulation channel is connected to the oil sump, and the filter is connected to the circulation channel and is connected to the oil supply tank.

4. The wavy bearing spline lock ring mechanism for an aeroengine according to claim 3, characterized in that, the wavy bearing spline lock ring mechanism for the aeroengine further comprises a sealing structure, which is arranged on one side of the bearing.

5. The wavy bearing spline lock ring mechanism for an aeroengine according to claim 4, characterized in that, the sealing structure comprises a dynamic seal and a sealing ring. The sealing ring is arranged between the transmission gear sleeve and the drive shaft, and the dynamic seal is arranged on one side of the bearing close to the nozzle.

6. An assembly method for a wavy bearing spline lock ring mechanism of an aeroengine, which is applied to the wavy bearing spline lock ring mechanism of the aeroengine described in claim 1, Characterized in that, including: assembling the impeller disc on the transmission gear sleeve in an interference fit manner; assembling the drive shaft and the bearing by interference fit; installing the bearing in the casing; sleeving the wavy bearing spline lock ring on the drive shaft and pushing it against the bearing; connecting the transmission gear sleeve to the drive shaft through splines and pushing it to the wavy bearing spline lock ring; turning the nut to apply axial pressure to the transmission gear sleeve, forcing the wavy bearing spline lock ring to undergo elastic deformation and be in a compressed state; measuring the distance between the impeller disc blades and the casing until the clearance of 0.6 mm between the impeller disc blades and the casing is satisfied, stopping turning the nut and fixing the nut in the current position.

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