Piezoelectric micro-injection system for active oil supply of space-oriented bearing assembly

Abstract

This invention provides a piezoelectric micro-jet system for active oil replenishment of space bearing assemblies, comprising: at least one piezoelectric micro-jet assembly; the piezoelectric micro-jet assembly includes an oil chamber substrate, a ejector pin module, a piezoelectric module, and a spring piston assembly; the ejector pin module includes an ejector pin, an elastic plate, and an oil storage piston cylinder; the oil chamber substrate is provided with micro-oil holes, the micro-oil holes corresponding to the bearing settings of the bearing assembly; one end of the ejector pin passes through the micro-oil hole and is connected to the elastic plate; the piezoelectric module is used to vibrate the elastic plate, the elastic plate drives the ejector pin to reciprocate, and the ejector pin is used to adjust the opening and closing of the micro-oil holes; the spring piston assembly is disposed on the oil storage piston cylinder, and the spring piston assembly can continuously provide back pressure to the lubricating oil in the oil storage piston cylinder; the oil storage piston cylinder is connected to the micro-oil holes. This invention can precisely control the oil supply quantity, timing, and position of the space attitude control bearing assembly, improving oil supply efficiency and effective lubrication rate.

Description

Technical Field

[0001] This invention relates to the field of active lubrication technology for space bearing assemblies, specifically to a piezoelectric micro-jet system for active lubrication of space bearing assemblies. Background Technology

[0002] Space attitude control capabilities, characterized by high-angle, rapid maneuvering, high-precision, high-stability pointing, and long-life on-orbit service, are among the core technologies of satellites. They directly impact the completion of critical missions such as orbit transfer, missile early warning, and wartime detection. The level of their development has become an important indicator of a nation's overall space technology level and is of great significance to my country's national defense capabilities. Reaction flywheels, due to their significant torque amplification effect (similar to torque gyroscopes) and long service life, enable space attitude control systems to possess high-torque, high-precision attitude control output capabilities, thereby meeting the control requirements of high-angle, rapid maneuvering and high-precision, high-stability pointing.

[0003] Statistics show that approximately 37% of satellite malfunctions are caused by failures in the momentum wheel attitude control system, primarily due to the deterioration of the lubrication condition of the bearing assembly. Limited by current research bottlenecks in bearing assembly lubrication technology, bearing assemblies that have been in operation for a long time in orbit experience decreased frictional performance and unstable frictional torque, leading to problems such as increased current output, abnormal speed response, and jamming in the momentum wheel. Therefore, reliable and durable lubrication of the momentum wheel bearing assembly has become a significant challenge in the aerospace satellite field.

[0004] To address the challenge of reliable lubrication of momentum wheel bearing assemblies over long space lifespans, scholars both domestically and internationally have proposed two lubrication schemes: passive and active. However, due to space constraints and the limitations of passive lubrication mechanisms, the amount of oil a spacecraft can carry is insufficient for long-term effective lubrication under low-speed maneuvering conditions. Active lubrication technology, with its controllable supply volume, timing, and location, as well as its ability to achieve closed-loop control, can improve lubrication efficiency and effective lubrication rate. With the same oil capacity, it can increase the reliable lubrication time of the bearing assembly and extend the satellite's on-orbit service life. However, both excessive and insufficient lubrication can increase the frictional torque of the bearing assembly. Furthermore, excessive lubrication can lead to insufficient lubrication later on and internal contamination. Therefore, long-term reliable and precise lubrication in space remains a critical issue that urgently needs to be addressed in the aerospace field.

[0005] Patent document CN210949567U discloses a lubricated bearing, including an inner ring, an outer ring, and rollers. The inner and outer rings are combined to form a rolling cavity for the rollers to rotate. An oil replenishing ring is included. The outer ring has an annular oil replenishing groove for the oil replenishing ring to insert into, and an annular oil outlet groove that communicates with the rolling cavity. The oil replenishing ring has a hollow grease reservoir and several hollow oil outlet chambers that communicate with the grease reservoir. An oil outlet block is slidably disposed within each oil outlet chamber, and the oil outlet chamber has an opening for the oil outlet block to protrude or retract. The oil outlet block has an oil outlet hole for transmitting grease. However, this patent document still has the problem that both excessive and insufficient oil supply can lead to increased frictional torque in the bearing assembly, and excessive oil supply can also lead to insufficient oil supply later and contamination within the cavity.

[0006] Patent document CN213235798U discloses a combined needle roller bearing with easy oil replenishment, including an outer ring, a mounting seat, mounting screws, an inner ring, needle rollers, a cage, rollers, a retaining ring, and an oil replenishment system. The mounting seat is fixed inside the outer ring by mounting screws, and the inner ring restricts rotation within the mounting seat. A ring of needle rollers is provided between the inner ring and the mounting seat. A ring of rollers is symmetrically arranged on both sides of the needle rollers on the inner ring, and a retaining ring is provided on the outer side of the rollers. An oil replenishment system is provided between the outer ring and the mounting seat. The oil replenishment system includes an outer oil passage and an inner oil passage. The outer end of the outer oil passage has an oil inlet, and the outer end of the inner oil passage has a clamping groove that clamps a fitting with a one-way valve. The inner end of the inner oil passage has three branch pipes. However, the technical solution of this patent document differs from that of this application. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a piezoelectric micro-jet system for active oil replenishment of space bearing assemblies.

[0008] According to the present invention, a piezoelectric micro-spraying system for active oil replenishment of space bearing assemblies includes: at least one piezoelectric micro-spraying component; the piezoelectric micro-spraying component includes an oil chamber substrate, a ejector pin module, a piezoelectric module, and a spring piston assembly; the ejector pin module includes an ejector pin, an elastic plate, and an oil storage piston cylinder;

[0009] The oil cavity substrate is provided with micro oil holes, which correspond to the bearings of the bearing assembly. One end of the ejector pin passes through the micro oil hole and is connected to the elastic plate. The piezoelectric module is used to vibrate the elastic plate, and the elastic plate drives the ejector pin to reciprocate. The ejector pin is used to adjust the opening and closing of the micro oil holes.

[0010] The spring piston assembly is disposed on the oil storage piston cylinder, and the spring piston assembly can continuously provide back pressure to the lubricating oil in the oil storage piston cylinder. The oil storage piston cylinder is connected to the micro oil hole.

[0011] Preferably, the piezoelectric micro-jet assembly is configured as two, and the bearing assembly includes two bearings respectively disposed at both ends of the connecting shaft;

[0012] Two piezoelectric micro-spraying components are mounted on the connecting shaft and are arranged in opposite directions to simultaneously provide active lubrication to the bearings at both ends.

[0013] The oil cavity substrate is mounted on the connecting shaft, and both the ejector pin module and the piezoelectric module are mounted on the oil cavity substrate.

[0014] Preferably, the oil storage piston cylinder is provided with a fourth through hole for storing lubricating oil, and the spring piston assembly is disposed in the fourth through hole;

[0015] The oil storage piston cylinder is provided with a third through hole at one end near the bearing, and the third through hole is connected to the fourth through hole and the micro oil hole.

[0016] Preferably, the oil storage piston cylinder is provided with a connecting structure at one end near the bearing;

[0017] The connecting structure is provided with a second groove, which is connected to the third through hole and the micro oil hole;

[0018] The elastic plate is connected to the connecting structure.

[0019] Preferably, the ejector pin includes an ejector pin rod and a microsphere;

[0020] The microsphere is disposed at one end of the ejector rod, and the other end of the ejector rod passes through the micro-oil hole and is connected to the elastic plate; the microsphere can seal the micro-oil hole;

[0021] The piezoelectric module can generate reciprocating vibrations to deform the elastic plate. Under the action of its elastic restoring force and the vibration of the piezoelectric module, the elastic plate drives the ejector rod and the microsphere to reciprocate.

[0022] Preferably, the piezoelectric module includes a top block and a piezoelectric stack;

[0023] The top block is disposed on the piezoelectric stack, and the piezoelectric stack is used to drive the top block to vibrate.

[0024] Preferably, the piezoelectric module further includes a first connecting layer, a second connecting layer, and a connecting frame;

[0025] The first connecting layer and the second connecting layer are respectively disposed at both ends of the piezoelectric stack. One end of the piezoelectric stack is connected to the top block through the first connecting layer, and the other end of the piezoelectric stack is connected to the connecting frame through the second connecting layer.

[0026] The connecting frame is connected to the oil cavity substrate.

[0027] Preferably, the spring-piston assembly includes a piston, a spring, and an end cap;

[0028] The piston is provided with a first connecting post, the end cap is provided with a second connecting post, and the two ends of the spring are respectively sleeved on the first connecting post and the second connecting post;

[0029] The first connecting post is provided with a first spring locking shaft, and the second connecting post is provided with a second spring locking shaft. The first spring locking shaft and the second spring locking shaft are used to lock and fix the spring.

[0030] The first connecting post is provided with a fifth through hole for inserting the first spring locking shaft, and the second connecting post is provided with a sixth through hole for inserting the second spring locking shaft.

[0031] The piston and the spring are disposed inside the oil storage piston cylinder, and the end cap is disposed at one end of the oil storage piston cylinder.

[0032] Preferably, the spring piston assembly further includes a sealing ring;

[0033] The piston is provided with an annular groove, and the sealing ring is disposed in the annular groove.

[0034] Preferably, the oil cavity substrate includes a semi-circular annular structure and a semi-cylindrical structure;

[0035] The semi-circular annular structure is disposed at one end of the semi-cylindrical structure, and threaded holes are provided at both ends of the semi-circular annular structure. Two connecting pieces are provided at the end of the semi-cylindrical structure away from the semi-circular annular structure, and a first through hole is provided on the connecting piece.

[0036] The two connecting pieces are provided at the two ends of the semi-circular annular structure.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. This invention provides a piezoelectric micro-jet system for active lubrication of bearing components for space attitude control, which can provide long-term, effective and controllable lubrication of bearing components in the space environment, increase the reliable lubrication time of bearing components, and thus extend the on-orbit service life of satellites.

[0039] 2. The piezoelectric micro-spraying system of the present invention can control the close contact and separation of the micro-ball at the tip of the ejector pin and the micro-oil hole through the piezoelectric component. When the micro-ball and the micro-oil hole are separated, the spring piston assembly can apply a strong back pressure to the lubricating oil in the oil chamber matrix to make the lubricating oil spray out; when the micro-ball and the micro-oil hole are in close contact, the micro-ball can be used to prevent the oil from spraying out. The oil spraying control strategy has high reliability.

[0040] 3. The piezoelectric stack of the present invention has the characteristics of fast response speed, high positioning accuracy and anti-electromagnetic interference. The piezoelectric micro-spraying system can accurately control the oil supply and timing of the active oil replenishment system in a space environment, improve oil supply efficiency and effective lubrication rate, and increase the reliable lubrication time of bearing components.

[0041] 4. The piezoelectric micro-spraying system of the present invention includes two piezoelectric micro-spraying components, namely a left piezoelectric micro-spraying component and a right piezoelectric micro-spraying component. The two components have the same structure and are both arranged in a 180-degree ring structure. They are arranged in opposite directions on the shaft surface, which can simultaneously provide active oil replenishment to the bearing components on both sides of the piezoelectric micro-spraying system.

[0042] 5. The oil chamber base, ejector pin module and spring piston assembly of the present invention can form a sealed oil chamber with variable capacity. A sealing ring is installed between the oil storage piston cylinder and the spring piston assembly, which has good sealing performance. The back pressure provided by the spring piston assembly can meet the requirements of long-term continuous oil injection.

[0043] 6. The piezoelectric micro-injection active oil replenishment system of the present invention has a compact structure, which can reduce the system design space. Attached Figure Description

[0044] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0045] Figure 1 This is a schematic diagram of the overall structure of the piezoelectric micro-jet system for active oil replenishment of space bearing assemblies in this invention.

[0046] Figure 2 This is an exploded view of the piezoelectric micro-jet oil replenishment component in this invention;

[0047] Figure 3 This is a schematic diagram of the structure of the oil cavity substrate in this invention;

[0048] Figure 4 This is an exploded view of the ejector pin module in this invention;

[0049] Figure 5 This is a schematic diagram of the piezoelectric structure in this invention;

[0050] Figure 6This is a schematic diagram of the spring piston assembly in this invention;

[0051] Figure 7 This is an exploded view of the spring-piston assembly in this invention.

[0052] The diagram illustrates:

[0053] Bearing assembly 1, fourth through hole 2233

[0054] Bearing 101 Connection structure 2234

[0055] Connecting shaft 102 Piezoelectric module 23

[0056] Piezoelectric micro-spraying assembly 2 Top block 231

[0057] Oil cavity substrate 21 First connecting layer 232

[0058] Micro-oil pores 211 Piezoelectric stack 233

[0059] First groove 212 Second connecting layer 234

[0060] Threaded hole 213, connecting bracket 235

[0061] First through hole 214 Spring piston assembly 24

[0062] Semi-circular ring structure 215 Piston 241

[0063] Semi-cylindrical structure 216 Annular groove 2411

[0064] Connecting piece 217, fifth through hole 2412

[0065] Ejector module 22 First connecting post 2413

[0066] Ejector pin 221, sealing ring 242

[0067] Microsphere 2211 First Spring Locking Shaft 243

[0068] Ejector rod 2212, spring 244

[0069] 222 Elastic plate, 245 Second spring locking shaft

[0070] Second through hole 2221 End cap 246

[0071] Oil reservoir piston cylinder 223, sixth through hole 2461

[0072] Second groove 2231 Second connecting post 2462

[0073] Third through hole 2232 Detailed Implementation

[0074] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0075] Example 1:

[0076] like Figures 1-7 As shown, this embodiment provides a piezoelectric micro-spraying system for active oil replenishment of a space bearing assembly, including: at least one piezoelectric micro-spraying component 2, the piezoelectric micro-spraying component 2 including an oil chamber base 21, a ejector pin module 22, a piezoelectric module 23, and a spring piston assembly 24, the ejector pin module 22 including an ejector pin 221, an elastic plate 222, and an oil storage piston cylinder 223, the oil chamber base 21 is provided with a micro-oil hole 211, the micro-oil hole 211 is provided corresponding to the bearing 101 of the bearing assembly 1, one end of the ejector pin 221 passes through the micro-oil hole 211 and is connected to the elastic plate 222, the piezoelectric module 23 is used to vibrate the elastic plate 222, the elastic plate 222 drives the ejector pin 221 to reciprocate, the ejector pin 221 is used to adjust the opening and closing of the micro-oil hole 211, the spring piston assembly 24 is provided on the oil storage piston cylinder 223, the spring piston assembly 24 can continuously provide back pressure for the lubricating oil in the oil storage piston cylinder 223, the oil storage piston cylinder 223 is connected to the micro-oil hole 211.

[0077] The ejector pin 221 includes an ejector rod 2212 and a microsphere 2211. The microsphere 2211 is disposed at one end of the ejector rod 2212, and the other end of the ejector rod 2212 passes through a micro-oil hole 211 and is connected to the elastic plate 222. The microsphere 2211 can seal the micro-oil hole 211. The piezoelectric module 23 can generate reciprocating vibration to deform the elastic plate 222. Under the action of its elastic restoring force and the vibration of the piezoelectric module 23, the elastic plate 222 drives the ejector rod 2212 and the microsphere 2211 to reciprocate.

[0078] The diameter of the micro-oil hole 211 is 0.6 mm, and the diameter of the microsphere 2211 of the ejector pin 221 is 0.8 mm.

[0079] The oil storage piston cylinder 223 is provided with a fourth through hole 2233 for storing lubricating oil. The spring piston assembly 24 is disposed within the fourth through hole 2233. A third through hole 2232 is provided at the end of the oil storage piston cylinder 223 near the bearing 101, and the third through hole 2232 communicates with the fourth through hole 2233 and the micro-oil hole 211. A connecting structure 2234 is provided at the end of the oil storage piston cylinder 223 near the bearing. A second groove 2231 is provided on the connecting structure 2234, and the second groove 2231 communicates with the third through hole 2232 and the micro-oil hole 211. The elastic plate 222 is connected to the connecting structure 2234.

[0080] The spring piston assembly 24 includes a piston 241, a spring 244, and an end cap 246. A first connecting post 2413 is provided on the piston 241, and a second connecting post 2462 is provided on the end cap 246. The two ends of the spring 244 are respectively sleeved on the first connecting post 2413 and the second connecting post 2462. A first spring locking shaft 243 is provided on the first connecting post 2413, and a second spring locking shaft 245 is provided on the second connecting post 2462. The first spring locking shaft 243 and the second spring locking shaft 245 are used to lock and fix the spring 244. A fifth through hole 2412 for inserting the first spring locking shaft 243 is provided on the first connecting post 2413, and a sixth through hole 2461 for inserting the second spring locking shaft 245 is provided on the second connecting post 2462. The piston 241 and the spring 244 are disposed inside an oil storage piston cylinder 223, and the end cap 246 is disposed at one end of the oil storage piston cylinder 223. The spring piston assembly 24 also includes a sealing ring 242. The piston 241 is provided with an annular groove 2411, and the sealing ring 242 is disposed in the annular groove 2411.

[0081] The piezoelectric module 23 includes a top block 231 and a piezoelectric stack 233. The top block 231 is disposed on the piezoelectric stack 233, and the piezoelectric stack 233 is used to drive the top block 231 to vibrate. The piezoelectric module 23 also includes a first connecting layer 232, a second connecting layer 234, and a connecting frame 235. The first connecting layer 232 and the second connecting layer 234 are respectively disposed at both ends of the piezoelectric stack 233. One end of the piezoelectric stack 233 is connected to the top block 231 through the first connecting layer 232, and the other end of the piezoelectric stack 233 is connected to the connecting frame 235 through the second connecting layer 234. The connecting frame 235 is connected to the oil cavity substrate 21.

[0082] Two piezoelectric micro-spraying components 2 are configured. The bearing assembly 1 includes two bearings 101 respectively disposed at both ends of the connecting shaft 102. The two piezoelectric micro-spraying components 2 are disposed on the connecting shaft 102 and are arranged in opposite directions to actively replenish oil to the bearings 1 at both ends simultaneously. The oil cavity base 21 is disposed on the connecting shaft 102. The ejector module 22 and the piezoelectric module 23 are both disposed on the oil cavity base 21.

[0083] The oil cavity substrate 21 includes a semi-circular annular structure 215 and a semi-cylindrical structure 216. The semi-circular annular structure 215 is disposed at one end of the semi-cylindrical structure 216, and threaded holes 213 are provided at both ends of the semi-circular annular structure 215. Two connecting pieces 217 are provided at the end of the semi-cylindrical structure 216 away from the semi-circular annular structure 215. The connecting pieces 217 are provided with first through holes 214, and the two connecting pieces 217 are provided corresponding to the two ends of the semi-circular annular structure 215. The semi-circular annular structure 215 and the semi-cylindrical structure 216 are integrally formed.

[0084] When two piezoelectric micro-spraying components 2 are set, the two oil cavity bases 21 wrap around the connecting shaft 102, and the two oil cavity bases 21 are assembled in opposite directions. The threaded hole 213 of one oil cavity base 21 is correspondingly set with the first through hole 214 of the other oil cavity base 21. They can be fixed by bolts to fix the two oil cavity bases 21 onto the connecting shaft 102.

[0085] The first groove 212 and the micro-oil hole 211 are disposed on the semi-circular annular structure 215, and the ejector pin module 22 and the piezoelectric module 23 are disposed on the semi-cylindrical structure 216.

[0086] Example 2:

[0087] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0088] This embodiment provides a piezoelectric micro-jet system for active oil replenishment of space bearing assemblies, including a left piezoelectric micro-jet assembly and a right piezoelectric micro-jet assembly.

[0089] The left and right piezoelectric micro-jet spraying assemblies have identical structures, each including an oil chamber substrate, a ejector pin module, a piezoelectric module, and a spring piston assembly. The inner surfaces of both assemblies are cylindrical, allowing them to be mounted on a shaft surface. The left and right piezoelectric micro-jet spraying assemblies are arranged in opposite directions, enabling simultaneous active lubrication of the spatial attitude control bearing assemblies on both sides.

[0090] The ejector module includes an ejector pin, an elastic circular plate, and an oil reservoir piston cylinder. The ejector pin module is welded to the oil cavity substrate at the first groove position at the front end of the oil cavity substrate. The piezoelectric module includes a piezoelectric stack, a hemispherical top block, and a connecting frame. The piezoelectric module is welded to the oil cavity substrate at the bottom surface of the connecting frame. Under voltage excitation, the piezoelectric stack can deform along the stacking direction. The hemispherical top block can transmit the deformation to the middle position of the elastic circular plate, thereby driving the ejector pin to reciprocate along this direction, realizing the tight contact and separation between the microsphere at the tip of the ejector pin and the micro-oil holes on the oil cavity substrate. The spring piston assembly includes a piston, a spring, a first spring locking shaft, a second spring locking shaft, a sealing ring, and an end cap. The spring piston assembly can continuously provide back pressure to the lubricating oil in the oil cavity substrate.

[0091] The diameter of the micro-oil hole at the front end of the oil cavity substrate is 0.6 mm. When the piezoelectric micro-spray system is working, lubricating oil can be sprayed out from the micro-oil hole.

[0092] The oil cavity substrate has a first through hole and a first threaded hole, and the left piezoelectric micro-jet assembly and the right piezoelectric micro-jet assembly can be connected by screws at the positions of the first through hole and the first threaded hole.

[0093] The elastic circular plate has a second through hole in the middle, and the micro needle is welded to the elastic circular plate at the position of the second through hole.

[0094] The oil storage piston cylinder has a third through hole, a fourth through hole, and a second groove. Under the action of the spring piston assembly, the lubricating oil can flow from the fourth through hole through the third through hole and the second groove in sequence to replenish the oil.

[0095] The microspheres have a diameter of 0.8 mm. By controlling the tightness and separation of the microspheres and the micro-oil holes, precise control of lubricating oil injection can be achieved.

[0096] The front end of the piezoelectric stack is connected to the hemispherical top block via a first epoxy resin AB adhesive, and the rear end of the piezoelectric stack is connected to the side of the connecting frame via a second epoxy resin AB adhesive.

[0097] An annular groove is provided near the front end of the piston to place a sealing ring, thereby sealing the contact position between the fourth through hole of the oil storage piston cylinder and the piston. A fifth through hole is provided at the rear end of the piston in a radial direction to insert the first spring locking shaft, and the first spring locking shaft is connected to the piston by welding at the position of the fifth through hole.

[0098] The end cap has a sixth through hole at its front end for inserting a second spring locking shaft, and is connected to the end cap by welding at the position of the sixth through hole.

[0099] The front end of the spring is pressed by the first spring locking shaft, and the rear end of the spring is pressed by the second spring locking shaft.

[0100] This embodiment discloses a piezoelectric micro-jet system for active oil replenishment of a space attitude control bearing assembly. The system mainly includes an oil chamber substrate, a ejector module, a piezoelectric module, and a spring-piston assembly. The oil chamber substrate is welded to the ejector module and the piezoelectric module. The ejector module includes an ejector pin, an elastic circular plate, and an oil reservoir piston cylinder. A small microsphere is located at the tip of the ejector pin. The piezoelectric module controls the contact and separation between the microsphere and the micro-oil holes on the oil chamber substrate, achieving precise oil replenishment of the bearing assembly. The piezoelectric module includes a piezoelectric stack, a hemispherical top block, and a connecting frame. The hemispherical top block transmits the deformation of the piezoelectric stack to the center of the elastic circular plate, thereby driving the ejector pin to reciprocate. The spring-piston assembly uses a spring to continuously provide back pressure to the lubricating oil in the oil chamber substrate. The structure of this embodiment can precisely control the oil supply quantity, timing, and position of the space attitude control bearing assembly, improving oil supply efficiency and effective lubrication rate.

[0101] Example 3:

[0102] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0103] like Figure 1 As shown, this embodiment provides a piezoelectric micro-jetting system for active oil replenishment of spatial attitude control bearing assemblies. It mainly includes two piezoelectric micro-jetting components 2: a left piezoelectric micro-jetting component and a right piezoelectric micro-jetting component. The left and right piezoelectric micro-jetting components have identical structures, and their inner surfaces are cylindrical. They can be mounted on the shaft surface in reverse arrangement using screws at the threaded hole 213 and the first through hole 214, enabling simultaneous active oil replenishment of both sides of the spatial attitude control bearing assemblies 1.

[0104] Figure 2 This is an exploded view of the piezoelectric micro-jet assembly 2, which includes an oil chamber base 21, a ejector module 22, a piezoelectric module 23, and a spring-piston assembly 24. The oil chamber base 21 is connected to the ejector module 22 by welding at the first groove 212; the piezoelectric module 23 is connected to the oil chamber base 21 by welding at the bottom surface of the connecting frame 235; the spring-piston assembly 24 can use the elastic force of the spring 244 to provide a sustained and powerful pressure to the lubricating oil in the oil chamber base 21, and can push the lubricating oil out at the moment the ejector 221 separates from the micro-oil hole 211 to achieve lubrication of the spatial attitude control bearing assembly 1.

[0105] Figure 3This is a schematic diagram of the structure of the oil cavity substrate 21. The oil cavity substrate 21 has a micro oil hole 211 at its front end. In the initial state, the microball 2211 at the tip of the ejector pin 221 is tightly attached to the micro oil hole 211, preventing the lubricating oil in the oil cavity substrate 21 from being ejected. The microball 2211 can be lifted by the piezoelectric module 23, so that the microball 2211 is separated from the micro oil hole 211, thereby realizing the ejection of the lubricating oil. The oil cavity substrate 21 has a first groove 212 at its front end, which can form an oil channel with the second groove 2231 on the oil storage piston cylinder 223 to realize the oil replenishment during the working process.

[0106] Figure 4 This is an exploded view of the ejector module 22, which includes an ejector pin 221, an elastic plate 222, and an oil reservoir piston cylinder 223. The elastic plate 222 has a second through hole 2221. During installation, the ejector pin 221 must first pass through the micro-oil hole 211 before being inserted into the second through hole 2221, and is then welded to the elastic plate 222 at the second through hole 2221. The oil reservoir piston cylinder 223 is welded to the elastic plate 222. The oil reservoir piston cylinder 223 has a third through hole 2232 and a fourth through hole 2233. Lubricating oil in the oil reservoir piston cylinder 223 can flow through the fourth through hole 2233, through the third through hole 2232, and into the second groove 2231 to replenish the oil. The elastic plate 222 is an elastic circular plate.

[0107] Figure 5 This is a structural schematic diagram of the piezoelectric module 23, which includes a top block 231, a piezoelectric stack 233, and a connecting frame 234. The top block 231 is connected to the front end of the piezoelectric stack 233 via a first connecting layer 232. The connecting frame 234 is connected to the rear end of the piezoelectric stack 233 via a second connecting layer 234. The bottom surface of the connecting frame 234 is welded to the oil cavity substrate 21. Under voltage excitation, the piezoelectric stack 233 can deform along the stacking direction. The top block 231 pushes the elastic plate 222 to the middle position, thereby driving the ejector pin 221 to reciprocate along this direction, realizing the tight contact and separation between the microsphere 2211 at the tip of the ejector pin 221 and the micro-oil hole 211. The top block 231 is a hemispherical top block. The first connecting layer 232 and the second connecting layer 234 are both epoxy resin AB glue.

[0108] Figure 6 and Figure 7These are a structural schematic diagram and an exploded view of the spring-piston assembly 24. The spring-piston assembly 24 includes a piston 241, a spring 244, a first spring locking shaft 243, a second spring locking shaft 245, a sealing ring 242, and an end cap 246. The sealing ring 242 is fitted onto the annular groove 2411 of the piston 241. The piston 241 and the first spring locking shaft 243 are connected by welding at the fifth through hole 2412. The second spring locking shaft 245 is connected by welding at the sixth through hole 2461. The first spring locking shaft 243 and the second spring locking shaft 245 respectively press the front end and the rear end of the spring 244. The spring-piston assembly 24 can continuously provide back pressure to the lubricating oil in the oil chamber base 21 through the spring 244.

[0109] Working principle:

[0110] In its initial state, the microsphere 2211 at the tip of the ejector pin 221 is tightly pressed against the micro-oil hole 211, preventing lubricating oil from spraying out of the oil chamber substrate 21. When the piezoelectric stack 233 is excited by voltage, it generates high-frequency vibration along the stacking direction, causing the top block 231 to push the elastic plate 222 to the middle position, achieving alternating switching between the tightly pressed and separated states of the microsphere 2211 and the micro-oil hole 211. When the microsphere 2211 separates from the micro-oil hole 211, the strong back pressure provided by the spring piston assembly 24 sprays lubricating oil onto the spatial attitude control bearing assembly 1, achieving lubrication. The piezoelectric micro-spraying system utilizes the fast response speed, high positioning accuracy, and anti-electromagnetic interference characteristics of the piezoelectric stack 233 to precisely control the oil supply quantity and timing in a spatial environment, improving oil supply efficiency and effective lubrication rate, and increasing the reliable lubrication time of the spatial attitude control bearing assembly 1.

[0111] This invention can precisely control the oil supply quantity, timing, and location of the spatial attitude control bearing assembly, thereby improving oil supply efficiency and effective lubrication rate.

[0112] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0113] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A piezoelectric micro-jet system for active oil replenishment of space bearing assemblies, characterized in that, include: At least one piezoelectric micro-spraying assembly (2); the piezoelectric micro-spraying assembly (2) includes an oil chamber substrate (21), a ejector pin module (22), a piezoelectric module (23), and a spring piston assembly (24); the ejector pin module (22) includes an ejector pin (221), an elastic plate (222), and an oil storage piston cylinder (223); The oil cavity substrate (21) is provided with micro oil holes (211), which are provided corresponding to the bearings (101) of the bearing assembly (1). One end of the ejector pin (221) passes through the micro oil hole (211) and is connected to the elastic plate (222). The piezoelectric module (23) is used to vibrate the elastic plate (222). The elastic plate (222) drives the ejector pin (221) to reciprocate. The ejector pin (221) is used to adjust the opening and closing of the micro oil hole (211). The spring piston assembly (24) is disposed on the oil storage piston cylinder (223). The spring piston assembly (24) can continuously provide back pressure to the lubricating oil in the oil storage piston cylinder (223). The oil storage piston cylinder (223) is connected to the micro oil hole (211).

2. The piezoelectric micro-jet system for active oil replenishment of space bearing assemblies according to claim 1, characterized in that, The piezoelectric micro-spraying assembly (2) is configured as two, and the bearing assembly (1) includes two bearings (101) respectively disposed at both ends of the connecting shaft (102); Two piezoelectric micro-spraying components (2) are mounted on the connecting shaft (102) and are arranged in opposite directions to simultaneously provide active lubrication to the bearings (101) at both ends. The oil cavity substrate (21) is disposed on the connecting shaft (102), and the ejector module (22) and the piezoelectric module (23) are both disposed on the oil cavity substrate (21).

3. The piezoelectric micro-jet system for active oil replenishment of space bearing assemblies according to claim 1, characterized in that, The oil storage piston cylinder (223) is provided with a fourth through hole (2233), which is used to store lubricating oil, and the spring piston assembly (24) is disposed in the fourth through hole (2233); The oil storage piston cylinder (223) is provided with a third through hole (2232) at one end near the bearing (101), and the third through hole (2232) is connected to the fourth through hole (2233) and the micro oil hole (211).

4. The piezoelectric micro-jet system for active oil replenishment of space bearing assemblies according to claim 3, characterized in that, The oil storage piston cylinder (223) is provided with a connecting structure (2234) at one end near the bearing; The connecting structure (2234) is provided with a second groove (2231), which is connected to the third through hole (2232) and the micro oil hole (211); The elastic plate (222) is connected to the connecting structure (2234).

5. The piezoelectric micro-jet system for active oil replenishment of space bearing assemblies according to claim 1, characterized in that, The ejector pin (221) includes an ejector pin rod (2212) and a microsphere (2211); The microsphere (2211) is disposed at one end of the ejector rod (2212), and the other end of the ejector rod (2212) passes through the micro-oil hole (211) and is connected to the elastic plate (222); the microsphere (2211) can seal the micro-oil hole (211); The piezoelectric module (23) can generate reciprocating vibration to deform the elastic plate (222). Under the action of its elastic restoring force and the vibration of the piezoelectric module (23), the elastic plate (222) drives the ejector rod (2212) and the microsphere (2211) to reciprocate.

6. The piezoelectric micro-jet system for active oil replenishment of space bearing assemblies according to claim 1, characterized in that, The piezoelectric module (23) includes a top block (231) and a piezoelectric stack (233); The top block (231) is disposed on the piezoelectric stack (233), and the piezoelectric stack (233) is used to drive the top block (231) to vibrate.

7. The piezoelectric micro-jet system for active oil replenishment of space bearing assemblies according to claim 6, characterized in that, The piezoelectric module (23) also includes a first connecting layer (232), a second connecting layer (234), and a connecting frame (235); The first connecting layer (232) and the second connecting layer (234) are respectively disposed at both ends of the piezoelectric stack (233). One end of the piezoelectric stack (233) is connected to the top block (231) through the first connecting layer (232), and the other end of the piezoelectric stack (233) is connected to the connecting frame (235) through the second connecting layer (234). The connecting frame (235) is connected to the oil cavity base (21).

8. The piezoelectric micro-jet system for active oil replenishment of space bearing assemblies according to claim 1, characterized in that, The spring-piston assembly (24) includes a piston (241), a spring (244), and an end cap (246); The piston (241) is provided with a first connecting post (2413), the end cap (246) is provided with a second connecting post (2462), and the two ends of the spring (244) are respectively sleeved on the first connecting post (2413) and the second connecting post (2462); The first connecting post (2413) is provided with a first spring locking shaft (243), and the second connecting post (2462) is provided with a second spring locking shaft (245). The first spring locking shaft (243) and the second spring locking shaft (245) are used to lock and fix the spring (244). The first connecting post (2413) is provided with a fifth through hole (2412) for inserting the first spring locking shaft (243), and the second connecting post (2462) is provided with a sixth through hole (2461) for inserting the second spring locking shaft (245); The piston (241) and the spring (244) are disposed inside the oil storage piston cylinder (223), and the end cap (246) is disposed at one end of the oil storage piston cylinder (223).

9. The piezoelectric micro-jet system for active oil replenishment of space bearing assemblies according to claim 8, characterized in that, The spring piston assembly (24) also includes a sealing ring (242); The piston (241) is provided with an annular groove (2411), and the sealing ring (242) is disposed in the annular groove (2411).

10. The piezoelectric micro-jet system for active oil replenishment of space bearing assemblies according to claim 2, characterized in that, The oil cavity substrate (21) includes a semi-circular annular structure (215) and a semi-cylindrical structure (216); The semi-circular ring structure (215) is disposed at one end of the semi-cylindrical structure (216), and threaded holes (213) are provided at both ends of the semi-circular ring structure (215). Two connecting pieces (217) are provided at the end of the semi-cylindrical structure (216) away from the semi-circular ring structure (215), and a first through hole (214) is provided on the connecting piece (217). The two connecting pieces (217) are provided at the two ends of the semi-circular annular structure (215).

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