An axially preloaded high speed impact resistant shafting system

Abstract

The application provides an axial pre-tightening high-speed impact-resistant shaft system, and relates to the technical field of shaft systems.The system comprises a frame base assembly, a bearing assembly arranged on the frame base assembly, a main shaft sleeved in the bearing assembly, one end of the main shaft being used for connecting a rotating part and the other end of the main shaft being used for connecting a driving part, an axial pre-tightening force applying assembly arranged on the main shaft and used for applying an axial pre-tightening force to the bearing assembly, and an axial pre-tightening force sensor assembly arranged between the main shaft and the frame base assembly, which is used for feeding back the assembly pre-tightening force, accurately adjusting the pre-tightening force applied by the axial pre-tightening force applying assembly to the bearing assembly, and real-time detecting the pre-tightening force in the operation process of the bearing assembly, so as to ensure the controlled operation process and the stable operation under slight external interference.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shafting system, and more particularly to an axial pre-tightening high-speed impact-resistant shafting system. BACKGROUND

[0002] In the fields of aerospace, metallurgy, environmental protection and heavy industry, high-speed rotating shafting is widely used in various mechanical equipment, such as various high-speed rotating machine tool spindles, large engines, fans, compressors and centrifugal machines, etc.

[0003] However, the current conventional high-speed spindle has some defects in bearing support mode, and it is difficult to accurately apply the axial pre-tightening force of the rotating part (blade, impeller) and the rotating spindle, and it is difficult to monitor the loosening change after application during operation, resulting in the existence of gap in the shafting, greatly reducing the rigidity of the whole system, and it is difficult to guarantee the stability of the operation under the external disturbance, not to mention the safety under the action of large impact.

[0004] The purpose of the present application is to provide an axial pre-tightening high-speed impact-resistant shafting system to solve the problem that the current conventional high-speed spindle has some defects in bearing support mode, and it is difficult to accurately apply the axial pre-tightening force of the rotating part (blade, impeller) and the rotating spindle, and it is difficult to monitor the loosening change after application during operation, resulting in the existence of gap in the shafting, greatly reducing the rigidity of the whole system, and it is difficult to guarantee the stability of the operation under the external disturbance, not to mention the safety under the action of large impact. SUMMARY

[0005] The purpose of the present application is to provide an axial pre-tightening high-speed impact-resistant shafting system to solve the problem that the current conventional high-speed spindle has some defects in bearing support mode, and it is difficult to accurately apply the axial pre-tightening force of the rotating part (blade, impeller) and the rotating spindle, and it is difficult to monitor the loosening change after application during operation, resulting in the existence of gap in the shafting, greatly reducing the rigidity of the whole system, and it is difficult to guarantee the stability of the operation under the external disturbance, not to mention the safety under the action of large impact.

[0006] The purpose of the present application is to provide an axial pre-tightening high-speed impact-resistant shafting system to solve the problem that the current conventional high-speed spindle has some defects in bearing support mode, and it is difficult to accurately apply the axial pre-tightening force of the rotating part (blade, impeller) and the rotating spindle, and it is difficult to monitor the loosening change after application during operation, resulting in the existence of gap in the shafting, greatly reducing the rigidity of the whole system, and it is difficult to guarantee the stability of the operation under the external disturbance, not to mention the safety under the action of large impact.

[0007] In order to achieve the above purpose, the present application provides an axial pre-tightening high-speed impact-resistant shafting system, which comprises:

[0008] a frame base assembly;

[0009] a bearing assembly arranged on the frame base assembly;

[0010] a spindle sleeved in the bearing assembly, one end of the spindle being used for connecting a rotating part, the other end of the spindle being used for connecting a driving part;

[0011] an axial pre-tightening force applying assembly arranged on the spindle and used for applying axial pre-tightening force to the bearing assembly;

[0012] an axial pre-tightening force applying assembly arranged on the spindle and used for applying axial pre-tightening force to the bearing assembly;

[0013] An axial pre-tightening force sensor assembly disposed between the main shaft and the frame base assembly for detecting the axial pre-tightening force exerted by the axial pre-tightening force exertion assembly on the bearing assembly.

[0014] Preferably, the frame base assembly comprises:

[0015] A base having a recess in a middle portion thereof, and first and second holes in opposite ends thereof, the first and second holes having first and second annular grooves in inner side walls thereof, the first and second annular grooves extending out of the opposite ends of the base at one ends thereof;

[0016] First and second sleeves respectively sleeved in the first and second annular grooves, the first and second sleeves having first and second flanges respectively extending out of the opposite ends of the base at opposite ends thereof, the main shaft penetrating the first sleeve at one end thereof and the second sleeve at the other end thereof.

[0017] A cover plate covering the recess.

[0018] Preferably, the bearing assembly comprises:

[0019] A hydrostatic bearing having an inner ring sleeved on the main shaft and an outer ring fixed to the inner side wall of the first sleeve;

[0020] Four rolling angular contact bearings sleeved on the main shaft, two of the rolling angular contact bearings having outer rings fixed to the inner side wall of the first sleeve, and the other two of the rolling angular contact bearings having outer rings fixed to the inner side wall of the second sleeve.

[0021] Preferably, the hydrostatic bearing comprises:

[0022] A hydrostatic bearing rotor having an inner side wall keyed to the main shaft, the hydrostatic bearing rotor having an outer side wall and an end thereof extending into the first sleeve, the outer side wall and the end of the hydrostatic bearing rotor having an inclined rotor annular groove surface therebetween;

[0023] The outer side wall of the static pressure bearing stator is fixed to the inner side wall of the first sleeve, one end of the static pressure bearing stator extends outwardly with a stator flange, the stator flange is fixed to the first flange, and an inclined stator ring groove is arranged between the inner side wall of the static pressure bearing stator and the one end of the static pressure bearing stator.

[0024] The inner side wall of the static pressure bearing stator is rotationally connected to the outer side wall of the static pressure bearing rotor, and the rotor ring groove is arranged opposite to the stator ring groove.

[0025] A gap is arranged between the inner side wall of the static pressure bearing stator and the outer side wall of the static pressure bearing rotor, and the gap is provided with lubricating grease.

[0026] Preferably, the inner side wall of the first sleeve is provided with a first clamping part near the other end of the first sleeve, the other end of the second sleeve is provided with a second clamping part, two of the rolling angular contact bearings are arranged between the static pressure bearing and the first clamping part, and the other two rolling angular contact bearings are arranged on the second clamping part, and the axial pre-tightening force applying assembly comprises:

[0027] At least one butterfly spring washer is sleeved on the main shaft and arranged between the two rolling angular contact bearings and the first clamping part.

[0028] An outer ring adjusting ring and an inner ring adjusting ring, the outer ring adjusting ring is sleeved on the main shaft, two ends of the outer ring adjusting ring are respectively abutted against the static pressure bearing rotor and the two rolling angular contact bearings, the inner ring adjusting ring is sleeved on the inner side wall of the first sleeve, and two ends of the inner ring adjusting ring are respectively abutted against the static pressure bearing stator and the other two rolling angular contact bearings.

[0029] A first self-locking nut is threadedly connected to one end of the main shaft and abutted against the static pressure bearing rotor.

[0030] At least one second self-locking nut and a clamping sleeve ring, the second self-locking nut is threadedly connected to one end of the main shaft, and the clamping sleeve ring is sleeved on the main shaft and arranged between the second self-locking nut and the other two rolling angular contact bearings.

[0031] Preferably, a limiting ring groove is arranged on the side wall of the main shaft and near the butterfly spring washer, and the outer side wall of the first sleeve is provided with a through port, and the axial pre-tightening force sensor assembly comprises:

[0032] A sensing rotor is sleeved in the limiting ring groove, the inside of the sensing rotor is circumferentially arranged with a plurality of cross beams, and strain gauges are arranged on the cross beams.

[0033] A sensing stator, an inner side wall of the sensing stator is rotationally connected to an outer side wall of the sensing rotor, an outer side wall of the sensing stator is sleeved on an inner side wall of the first sleeve, the outer side wall of the sensing stator is provided with a signal transmitting antenna, the signal transmitting antenna is electrically connected with the strain gauge, and the signal transmitting antenna extends into the through hole.

[0034] As shown in Figure 2 Preferably, the side wall of the main shaft and located at the position of the inner ring adjusting ring is provided with a necked ring groove.

[0035] Preferably, the system further comprises four dustproof ring members, and the four dustproof ring members are sleeved on the main shaft, two of the dustproof ring members are arranged on the two sides of the two rolling angular contact bearings, and the other two dustproof ring members are arranged on the two sides of the other two rolling angular contact bearings.

[0036] Preferably, one end of the main shaft is provided with a locking thread, and the side wall of the main shaft and located at the position close to the other end of the main shaft is provided with a connecting spline.

[0037] Preferably, the side wall of the main shaft and located at the position close to the other end of the main shaft is provided with a flat key groove.

[0038] The axial pre-tightening high-speed impact-resistant shaft system has the beneficial effects that the axial pre-tightening force applying assembly is arranged on the main shaft and used for applying the axial pre-tightening force to the bearing assembly, the axial pre-tightening force sensor assembly is arranged between the main shaft and the frame base assembly and used for detecting the axial pre-tightening force applied by the axial pre-tightening force applying assembly to the bearing assembly, the system can meet the damage of the large-load shaft system force or external impact load to the shaft system, the axial pre-tightening force applying assembly applies the pre-tightening force to the bearing assembly through the feedback of the axial pre-tightening force sensor assembly, the pre-tightening force of the bearing assembly is accurately adjusted, the pre-tightening force in the internal operation process of the bearing assembly is detected in real time, the operation process is ensured to be controlled, the driving system is braked in an emergency once the pre-tightening force of the bearing assembly changes uncontrollably, the rigidity of the whole system is ensured, and the stable operation under slight external interference is ensured.

[0039] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0040] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the several views, and in which:

[0041] Figure 1A cross-sectional structural schematic diagram of an axial pre-tightening high-speed impact-resistant shaft system according to an embodiment of the present application is shown;

[0042] Figure 2 A main shaft structural schematic diagram of an axial pre-tightening high-speed impact-resistant shaft system according to an embodiment of the present application is shown;

[0043] Figure 3 An axial pre-tightening force sensor assembly structural schematic diagram of an axial pre-tightening high-speed impact-resistant shaft system according to an embodiment of the present application is shown;

[0044] Figure 4 An internal structural schematic diagram of an axial pre-tightening force sensor assembly of an axial pre-tightening high-speed impact-resistant shaft system according to an embodiment of the present application is shown;

[0045] Figure 5 A static pressure bearing cross-sectional structural schematic diagram of an axial pre-tightening high-speed impact-resistant shaft system according to an embodiment of the present application is shown;

[0046] Figure 6 An enlarged structural schematic diagram at A in FIG. 1 is shown; Figure 5

[0047] Figure 7 A first self-locking nut structural schematic diagram of an axial pre-tightening high-speed impact-resistant shaft system according to an embodiment of the present application is shown.

[0048] BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 1, frame base assembly; 2, bearing assembly; 3, main shaft; 4, axial pre-tightening force applying assembly; 5, axial pre-tightening force sensor assembly; 6, base; 7, first sleeve; 8, second sleeve; 9, cover plate; 10, static pressure bearing; 11, angular contact ball bearing; 12, static pressure bearing rotor; 13, static pressure bearing stator; 14, butterfly spring washer; 15, outer ring adjusting ring; 16, inner ring adjusting ring; 17, first self-locking nut; 18, second self-locking nut; 19, tightening sleeve ring; 20, necked ring groove; 21, sensing rotor; 22, crossbeam; 23, strain gauge; 24, sensing stator; 25, signal transmitting antenna; 26, gap; 27, dustproof ring; 28, connecting spline; 29, flat key groove; 30, upper half bearing cover; 31, lower half bearing cover; 32, locking screw thread; 33, notch. DETAILED DESCRIPTION

[0050] ​Preferred embodiments of the present application will be described in greater detail below. While the preferred embodiments of the present application are described below, it is to be understood that the present application can be carried out in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0051] As shown in Figure 1 The present application provides an axial pre-tightening high-speed impact-resistant shafting system, which comprises:

[0052] a frame base assembly 1;

[0053] a bearing assembly 2 arranged on the frame base assembly 1;

[0054] a main shaft 3 sleeved in the bearing assembly 2, one end of the main shaft 3 being used for connecting a rotating member, and the other end of the main shaft 3 being used for connecting a driving member;

[0055] an axial pre-tightening force applying assembly 4 arranged on the main shaft, used for applying an axial pre-tightening force to the bearing assembly 2;

[0056] an axial pre-tightening force sensor assembly 5 arranged between the main shaft 3 and the frame base assembly 1, used for detecting the axial pre-tightening force applied by the axial pre-tightening force applying assembly 4 to the bearing assembly 2.

[0057] Specifically, in order to solve the problems that the axial pre-tightening force of a rotating member (blade, impeller) and a rotating main shaft is difficult to be accurately applied, the axial pre-tightening force changes after being applied and is difficult to be monitored during operation, a gap exists in the shafting, the rigidity of the entire system is greatly reduced, the stable operation under external interference is difficult to be ensured, and the safety under a large impact is not considered, the present application provides an axial pre-tightening high-speed impact-resistant shafting system, which comprises an axial pre-tightening force applying assembly 4 arranged on the main shaft 3, used for applying an axial pre-tightening force to the bearing assembly 2, and an axial pre-tightening force sensor assembly 5 arranged between the main shaft 3 and the frame base assembly 1, used for detecting the axial pre-tightening force applied by the axial pre-tightening force applying assembly 4 to the bearing assembly 2. The system can meet the damage of a large load shafting force or an external impact load to the shafting, accurately adjusts the pre-tightening force of the bearing assembly 2 by the axial pre-tightening force sensor assembly 5 to the axial pre-tightening force applying assembly 4, and detects the pre-tightening force in the bearing assembly 2 during operation in real time, so as to ensure the controlled operation and emergency braking of the driving system in case of uncontrollable change of the pre-tightening force of the bearing assembly 2, ensure the rigidity of the entire system, and ensure the stable operation under external interference.

[0058] Preferably, the frame base assembly 1 comprises:

[0059] The base 6 is provided with a recess in the middle, and first and second holes in communication with the recess at two ends of the base 6, and first and second annular grooves in the inner side walls of the first and second holes respectively, and the first and second annular grooves extend out of the two ends of the base 6 at one end respectively;

[0060] The first and second sleeves 7 and 8 are sleeved in the first and second annular grooves respectively, and one end of the first sleeve 7 and one end of the second sleeve 8 abut against the other end of the first annular groove and the other end of the second annular groove respectively, and the other end of the first sleeve 7 and the other end of the second sleeve 8 extend out of the two ends of the base 6 outwardly with first and second flanges respectively, and the first and second flanges are fixedly connected to the two ends of the base 6 respectively, and one end of the main shaft 3 penetrates through the first sleeve 7, and the other end of the main shaft penetrates through the second sleeve 8.

[0061] The cover plate 9 is connected to the opening of the recess.

[0062] Specifically, the first and second sleeves 7 and 8 are used to support the main shaft 3, the cover plate 9 is a sheet metal part with a thickness of 1mm, and the cover plate 9 is used to prevent dust from entering the first and second sleeves 7 and 8.

[0063] Preferably, the bearing assembly 2 comprises:

[0064] The static pressure bearing 10 is sleeved on the main shaft 3 at the inner ring, and is fixedly connected to the inner side wall of the first sleeve 7 at the outer ring;

[0065] The four rolling angular contact bearings 11 are sleeved on the main shaft 3, and the outer rings of two of the rolling angular contact bearings 11 are fixedly connected to the inner side wall of the first sleeve 7, and the outer rings of the other two rolling angular contact bearings 11 are fixedly connected to the inner side wall of the second sleeve 8.

[0066] Specifically, the static pressure bearing 10 and the rolling angular contact bearings 11 are used to support the main shaft 3, so as to provide both rolling support and sliding support, the rolling angular contact bearings 11 provide the requirement of high-speed rotation, and the static pressure bearing 10 provides large impact resistance under external load, so as to meet the requirement of high speed and ensure the safety of the entire shaft system under large load impact, and the two rolling angular contact bearings 11 are installed back to back, and the other two rolling angular contact bearings 11 are also installed back to back, so as to facilitate the bearing impact.

[0067] As shown in Figure 5 and Figure 6 Preferably, the static pressure bearing 10 comprises:

[0068] The inner side wall of the hydrostatic bearing rotor 12 is keyed to the main shaft, one end of the hydrostatic bearing rotor 12 extends into the first sleeve 7, and an inclined rotor ring groove surface is arranged between the outer side wall of the hydrostatic bearing rotor and the one end of the hydrostatic bearing rotor;

[0069] The outer side wall of the hydrostatic bearing stator 13 is fixed to the inner side wall of the first sleeve 7, one end of the hydrostatic bearing stator 13 extends outwardly to have a stator flange, the stator flange is fixed to the first flange, and an inclined stator ring groove surface is arranged between the inner side wall of the hydrostatic bearing stator and the one end of the hydrostatic bearing stator;

[0070] The inner side wall of the hydrostatic bearing stator 13 is rotatably connected to the outer side wall of the hydrostatic bearing rotor 12, and the rotor ring groove surface is arranged opposite to the stator ring groove surface;

[0071] A gap 26 is arranged between the inner side wall of the hydrostatic bearing stator 13 and the outer side wall of the hydrostatic bearing rotor 12, and the gap 26 is filled with lubricating grease.

[0072] Specifically, the gap 26 can be accurately controlled during assembly. When the gap is 0.5 mm, the external 200t axial impact load can be resisted.

[0073] Preferably, the inner side wall of the first sleeve 7 is provided with a first clamping portion near the other end of the first sleeve 7, and the other end of the second sleeve 8 is provided with a second clamping portion, wherein two rolling angular contact bearings 11 are arranged between the hydrostatic bearing 10 and the first clamping portion, and the other two rolling angular contact bearings 11 are attached to the second clamping portion, and the axial pre-tightening force applying assembly 4 comprises:

[0074] At least one butterfly spring washer 14 is sleeved on the main shaft 3 and arranged between the two rolling angular contact bearings 11 and the first clamping portion;

[0075] An outer ring adjusting ring 15 and an inner ring adjusting ring 16, the outer ring adjusting ring 15 is sleeved on the main shaft 3, and the two ends of the outer ring adjusting ring 15 abut against the hydrostatic bearing rotor 12 and the two rolling angular contact bearings 11 respectively, the inner ring adjusting ring 16 is sleeved on the inner side wall of the first sleeve 7, and the two ends of the inner ring adjusting ring 16 abut against the hydrostatic bearing stator 13 and the other two rolling angular contact bearings 11 respectively;

[0076] A first self-locking nut 17 is threadedly connected to one end of the main shaft 3 and attached to the hydrostatic bearing rotor 12;

[0077] At least one second self-locking nut 18 and a tight sleeve ring 19, the second self-locking nut 18 is threadedly connected to one end of the main shaft 3, and the tight sleeve ring 19 is sleeved on the main shaft 3 and arranged between the second self-locking nut 18 and the other two rolling angular contact bearings 11.

[0078] Specifically, the application of the pre-tightening force is realized through the Belleville spring washer 14, the first self-locking nut 17 and the second self-locking nut 18, the number of the second self-locking nut 18 is two, the size of the gap is controlled by screwing the second self-locking nut 18 during assembly, and the precise pre-tightening force is ensured by the deformation of the Belleville spring washer 14, so as to ensure the rigidity of the whole shafting and the stability of high-speed rotation.

[0079] As shown in Figure 3 and Figure 4 , preferably, a limit ring groove is arranged on the side wall of the main shaft 3 and close to the position of the Belleville spring washer 14, and the outer side wall of the first sleeve 7 is provided with a through port, and the axial pre-tightening force sensor assembly 5 comprises:

[0080] a sensing rotor 21 sleeved in the limit ring groove, the inside of the sensing rotor 21 is circumferentially arranged with a plurality of cross beams 22, and the cross beams 22 are provided with strain gauges 23;

[0081] a sensing stator 24, the inner side wall of the sensing stator 24 is rotationally connected to the outer side wall of the sensing rotor 21, the outer side wall of the sensing stator 24 is sleeved in the inner side wall of the first sleeve 7, the outer side wall of the sensing stator 24 is provided with a signal transmitting antenna 25, the signal transmitting antenna 25 is electrically connected with the strain gauges 23, and the signal transmitting antenna 25 extends into the through port.

[0082] Specifically, the number of the cross beams 22 is eight, which is used for sensing the size of the annular axial force, and the strain gauges 23 can be adhered on the cross beams 22, the strain gauges 23 are composed into a Wheatstone bridge, so as to convert the force signal into a voltage signal, which is then output through the signal transmitting antenna 25, and then the periodic change of the axial force during the operation of the shafting can be detected in real time, so as to ensure that the pre-tightening force is controllable during the operation, to ensure the rigidity of the whole system and the stable operation under slight external disturbance.

[0083] As shown in Figure 2 , preferably, a necked ring groove 20 is arranged on the side wall of the main shaft 3 and located at the position of the inner ring adjusting ring 16.

[0084] Specifically, the gap 26 of the hydrostatic bearing 10 is precisely controlled during assembly, so as to ensure that the deformation of the necked ring groove 20 of the main shaft under the action of a large impact drives the deformation of the hydrostatic bearing rotor 12, and then the external impact can be balanced through the hydrostatic bearing rotor 12 and the hydrostatic bearing stator 13.

[0085] Preferably, the system further comprises four dustproof ring parts 27, the four dustproof ring parts 26 are all sleeved on the main shaft 3, two of the dustproof ring parts 27 are arranged on the two sides of the two rolling angular contact bearings 11, and the other two dustproof ring parts 27 are arranged on the two sides of the other two rolling angular contact bearings 11.

[0086] Specifically, the dustproof ring member 27 is used to prevent dust from entering the angular contact ball bearing 11.

[0087] Preferably, one end of the main shaft 3 is provided with a locking thread 32, and the side wall of the main shaft 3 and close to the one end of the main shaft 3 is provided with a connecting spline 28.

[0088] The side wall of the main shaft 3 and close to the other end of the main shaft 3 is provided with a flat key groove 29.

[0089] Specifically, one end of the main shaft 3 is connected with the rotating member through the connecting spline 28, and is axially locked through the locking thread 32, and the other end of the main shaft 3 is connected with the driving member through the flat key groove 29, so as to ensure that the output end of the driving member is coaxially connected with the main shaft 3, and the vibration caused by the insufficient contact stiffness or dynamic balance failure of the high-speed rotating main shaft 3 and the rotating member, i.e. the blade or impeller, after being connected is solved.

[0090] As shown in Figure 7 Preferably, the outer side wall of the first self-locking nut 17 is provided with a notch 33, and the width of the notch 33 is 4mm.

[0091] Specifically, after the first self-locking nut 17 is tightened, it can be kept tight under a certain pre-tightening force without loosening.

[0092] Preferably, the base 6 includes an upper half bearing cover 30 and a lower half bearing cover 31, and the upper half bearing cover 30 and the lower half bearing cover 31 can form a first hole and a second hole after being covered with each other, and the outer side wall of the lower half bearing cover 31 is provided with a draft angle of 88.8°.

[0093] Specifically, the half-split structure is adopted to ensure the convenience of installation.

[0094] In summary, the axial pre-tightening high-speed impact-resistant shaft system provided by the application is implemented by feeding back the assembly pre-tightening force through the strain gauges 23 on the cross beams 22 in the sensing rotor 21, accurately adjusting the internal pre-tightening force of the angular contact ball bearing 11 and the gap between the inner wall of the static pressure bearing stator 13 and the outer wall of the static pressure bearing rotor 12, ensuring that the necking ring groove 20 of the main shaft 3 is deformed with external impact or large load, playing a protective role for the shaft system, the number of cross beams 22 is eight, which is used to perceive the size of the annular axial force, the strain gauges 23 can be attached to the cross beams 22, the strain gauges 23 are composed into a Wheatstone bridge, which can convert the force signal into a voltage signal, and then output through the signal transmitting antenna 25, and then the periodic change of the axial force in the operation process of the shaft system can be detected in real time, ensuring that the pre-tightening force is detected and controlled in real time during operation, and once the pre-tightening force of the shaft system changes uncontrollably, the control driving part is braked urgently, ensuring the rigidity of the whole system and the stable operation under slight external disturbance. The axial pre-tightening force sensor assembly 5 is creatively installed in the shaft system, the pre-tightening force of the angular contact ball bearing 11 is detected in real time, and the gap 26 of the static pressure bearing 10 is ensured through assembly, ensuring that the shaft system is protected under external large load deformation, and being suitable for various high-speed large-load rotating shaft systems such as vehicle bodies, platforms and engines.

[0095] The above has described the embodiments of the application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An axially preloaded high speed impact resistant shafting system characterized by, The system comprises: a frame base assembly; a bearing assembly arranged on the frame base assembly; a main shaft sleeved on the inside of the bearing assembly, one end of the main shaft being used for connecting a rotating member, the other end of the main shaft being used for connecting a driving member; an axial pre-tightening force applying assembly arranged on the main shaft and used for applying an axial pre-tightening force to the bearing assembly; an axial pre-tightening force sensor assembly arranged between the main shaft and the frame base assembly and used for detecting the axial pre-tightening force applied by the axial pre-tightening force applying assembly to the bearing assembly; the frame base assembly comprises a base, a first sleeve and a second sleeve; a recess is arranged in the middle of the base, first and second holes in communication with the recess are respectively arranged at the two ends of the base, first and second annular grooves are respectively arranged on the inner side walls of the first and second holes, and one end of each of the first and second annular grooves extends out of the two ends of the base; the first and second sleeves are respectively sleeved in the first and second annular grooves, one end of the first sleeve and one end of the second sleeve are respectively abutted against one end of the first annular groove and one end of the second annular groove, the other end of the first sleeve and the other end of the second sleeve respectively extend out of the two ends of the base with first and second flanges, the first and second flanges are respectively fixed to the two ends of the base, one end of the main shaft penetrates through the first sleeve, and the other end of the main shaft penetrates through the second sleeve; the bearing assembly comprises: a hydrostatic bearing, a hydrostatic bearing rotor of the hydrostatic bearing being sleeved on the main shaft, and a hydrostatic bearing stator of the hydrostatic bearing being fixed to the first flange of the first sleeve and the inner side wall of the first sleeve; four rolling angular contact bearings, two of the rolling angular contact bearings being fixed to the inner side wall of the first sleeve, and the other two rolling angular contact bearings being fixed to the inner side wall of the second sleeve; a first clamping portion is arranged on the inner side wall of the first sleeve near the end position of the middle part of the main shaft, and a second clamping portion is arranged on the inner side wall of the second sleeve near the end position of the middle part of the main shaft, two of the rolling angular contact bearings are arranged between the hydrostatic bearing and the first clamping portion, and the other two rolling angular contact bearings are arranged on the second clamping portion; the axial pre-tightening force applying assembly comprises: at least one disc spring washer, the disc spring washer being sleeved on the main shaft and arranged between the two rolling angular contact bearings and the first clamping portion; an outer ring adjusting ring and an inner ring adjusting ring, the inner ring adjusting ring being sleeved on the main shaft, two ends of the inner ring adjusting ring being respectively abutted against the hydrostatic bearing rotor of the hydrostatic bearing and two of the rolling angular contact bearings, and the outer ring adjusting ring being sleeved on the inner side wall of the first sleeve, two ends of the outer ring adjusting ring being respectively abutted against the hydrostatic bearing stator of the hydrostatic bearing and two of the rolling angular contact bearings. A first self-locking nut is threadedly connected to one end of the main shaft and abuts against the hydrostatic bearing rotor; At least one second self-locking nut is threadedly connected to the other end of the main shaft, and a tight sleeve ring is sleeved on the main shaft and arranged between the second self-locking nut and the other two rolling angular contact bearings. A necked ring groove is arranged on the side wall of the main shaft at the position of the inner ring adjusting ring.

2. A high speed impact resistant shafting system with axial pre-tension according to claim 1, characterized in that, The frame base assembly further comprises: A cover plate is arranged at the notch position of the groove.

3. A high speed impact resistant shafting system with axial pre-tension according to claim 2, characterized in that, The hydrostatic bearing comprises: A hydrostatic bearing rotor is keyed to the inner side wall of the main shaft, one end of the hydrostatic bearing rotor extends into the first sleeve, and an inclined rotor ring groove surface is arranged between the outer side wall of the hydrostatic bearing rotor and one end of the hydrostatic bearing rotor; A hydrostatic bearing stator is fixed to the inner side wall of the first sleeve, one end of the hydrostatic bearing stator extends outwardly and has a stator flange, the stator flange is fixed to the first flange, and an inclined stator ring groove surface is arranged between the inner side wall of the hydrostatic bearing stator and one end of the hydrostatic bearing stator; The inner side wall of the hydrostatic bearing stator is rotatably connected to the outer side wall of the hydrostatic bearing rotor, and the rotor ring groove surface and the stator ring groove surface are arranged opposite to each other; A gap is arranged between the inner side wall of the hydrostatic bearing stator and the outer side wall of the hydrostatic bearing rotor, and grease is arranged in the gap.

4. A high speed impact resistant shafting system with axial pre-tension according to claim 3, characterized in that, A limiting ring groove is arranged on the side wall of the main shaft at a position close to the disc spring washer, and the outer side wall of the first sleeve is provided with a through opening. The axial pre-tightening force sensor assembly comprises: A sensing rotor is sleeved in the limiting ring groove, a plurality of cross beams are circumferentially arranged on the inside of the sensing rotor, and strain gauges are arranged on the cross beams; 5. A high speed impact resistant shafting system with axial pre-tension according to claim 4, characterized in that, A sensing stator is rotatably connected to the outer side wall of the sensing rotor, the outer side wall of the sensing stator is sleeved on the inner side wall of the first sleeve, the outer side wall of the sensing stator is provided with a signal transmitting antenna, the signal transmitting antenna is electrically connected to the strain gauges, and the signal transmitting antenna extends into the through opening.

6. A high speed impact resistant shafting system with axial pre-tensioning as claimed in claim 1 wherein, The system further comprises four dustproof ring members, and the four dustproof ring members are all sleeved on the main shaft, two of the dustproof ring members are arranged on the two sides of the two rolling angular contact bearings, and the other two dustproof ring members are arranged on the two sides of the other two rolling angular contact bearings.

7. A high speed impact resistant shafting system with axial pre-tensioning as claimed in claim 1 wherein, One end of the main shaft is provided with a locking thread, and a connecting spline is arranged on the side wall of the main shaft at a position close to the other end of the main shaft. A flat key groove is arranged on the side wall of the main shaft at a position close to the other end of the main shaft.

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