CN111075845A - Active supplementary oil supply unit - Google Patents
Active supplementary oil supply unit Download PDFInfo
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- CN111075845A CN111075845A CN202010018442.4A CN202010018442A CN111075845A CN 111075845 A CN111075845 A CN 111075845A CN 202010018442 A CN202010018442 A CN 202010018442A CN 111075845 A CN111075845 A CN 111075845A
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- oil
- oil supply
- bearing
- lubricating
- supply device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
- F16C33/6659—Details of supply of the liquid to the bearing, e.g. passages or nozzles
- F16C33/6662—Details of supply of the liquid to the bearing, e.g. passages or nozzles the liquid being carried by air or other gases, e.g. mist lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
- F16C33/6659—Details of supply of the liquid to the bearing, e.g. passages or nozzles
- F16C33/6666—Details of supply of the liquid to the bearing, e.g. passages or nozzles from an oil bath in the bearing housing, e.g. by an oil ring or centrifugal disc
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
- F16C33/6681—Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses an active supplementary oil supply device, which is applied to a bearing assembly of a satellite flywheel and a control moment gyro, and comprises: the oil storage structure, the oil supply structure, the oil conveying parts and the atomized oil supply parts; each oil conveying component is communicated with the oil storage structure and the oil supply structure so as to convey the lubricating oil stored in the oil storage structure to the oil supply structure; the atomized oil supply component is arranged in the oil supply structure and used for atomizing the lubricating oil in the oil supply structure and spraying the lubricating oil to the bearing raceway of the bearing assembly. The atomized oil supply part breaks up the surface energy of the lubricating oil in the oil supply structure to generate micro liquid drops, and the micro liquid drops are sprayed to the bearing raceway under the action of kinetic energy, so that the aims of supplying oil to the bearing raceway in a micro-supplementing way and prolonging the service life of the bearing are fulfilled.
Description
Technical Field
The invention relates to the technical field of long-acting lubrication of space rolling bearings, in particular to an active supplementary oil supply device.
Background
The flywheel (satellite flywheel) and the control moment gyro are used as key execution components in a satellite attitude control system, and the purpose of accurately controlling the satellite attitude is realized by carrying out momentum exchange with a satellite body, wherein the bearing assembly is a key component of the flywheel and the control moment gyro and is also a main factor for limiting performance indexes such as the highest rotating speed of the flywheel and the like and the service life of the flywheel. One NASA technical memo indicates that long-term lubrication of the space is a major cause of limiting flywheel life. Under the vacuum and weightless space environment, the lubricating oil is volatile and creeps to lose, when the lubricating oil is too large in loss, an elastic fluid lubricating oil film cannot be formed on a bearing raceway, bearing abrasion is accelerated, and under the low-speed and maneuvering working conditions, the bearing is in a lean oil or semi-lubricating state, so that unstable operation of a retainer and increase of bearing abrasion loss are easily induced, the service life of the bearing is reduced, and satellite failure or service life reduction is directly caused. The most effective direct solution is to supplement oil supply, but because the bearing assembly has a narrow internal space, a space environment hydraulic pump cannot be realized, and the assembly cannot be replaced manually or limited conditions such as oil injection cannot be realized, the research on a reliable and efficient long-term supplement oil supply technology has important significance.
At present, porous polymer oil-containing retainers adopted by domestic flywheel and control moment gyro bearings are supplied with oil in a capillary manner, so that the service life of a bearing assembly can be ensured to be 2-3 years. The oil storage device (ring) is combined to realize the storage and centrifugal oil supply of lubricating oil, so that the service life of the bearing can reach 5-8 years. The existing oil supply device is then as follows: the centrifugal oil reservoir is arranged between the inner space ring and the outer space ring of the bearing assembly, and realizes passive oil supply by means of centrifugal force and seepage-diffusion action of porous materials. Through a large number of research analyses, it is known that the in-orbit case has the following disadvantages: the oil supply quantity, the oil supply speed, the oil supply time and the oil supply position can not be controlled in real time according to the actual situation; the continuous oil supply causes low oil supply utilization rate and large lubricating oil loss; the porous oil storage material has the phenomenon of vacuum volatilization loss of lubricating oil; along with the throwing of the lubricating oil, the oil content in the oil reservoir is reduced, the centrifugal force is reduced, the oil supply rate is reduced, even the oil does not flow out, and the oil supply is unstable; at low rotational speeds, centrifugal forces are not sufficient to throw the oil out, and the lubrication effect is poor. Although the method for solving the problem of poor lubricating effect of the centrifugal passive oil feeder at low speed by adopting a solid-liquid composite lubricating technology exists at present, the method has a neutral position between solid lubrication and boundary lubrication, and the lubricating effect cannot completely meet the working condition requirement.
Disclosure of Invention
The invention aims to provide an active supplementary oil supply device, which realizes the purpose of supplying oil in an atomizing state under the control of a fuzzy control system by adopting an active oil supply mode under the vacuum and weightless space environment so as to meet the long-acting lubrication and micro-supply requirements of a space bearing.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
an active supplementary oil supply device applied to a bearing assembly of a satellite flywheel and a control moment gyro comprises: the oil storage structure, the oil supply structure, the oil conveying parts and the atomized oil supply parts; each oil delivery component is communicated with the oil storage structure and the oil supply structure so as to deliver the lubricating oil stored in the oil storage structure to the oil supply structure; the atomized oil supply component is arranged in the oil supply structure and used for atomizing the lubricating oil in the oil supply structure and spraying the lubricating oil to the bearing raceway of the bearing assembly.
Optionally, the oil storage structure and the oil supply structure are arranged between a rotating space ring and a static space ring of the bearing assembly and are in interference contact with the static space ring.
Optionally, the oil storage structure and the oil supply structure are both stationary relative to the stationary spacer.
Optionally, the number of the oil supply structures is two, the two oil supply structures are respectively located at two ends of the oil storage structure, and the injection position corresponds to a bearing raceway of the bearing assembly.
Optionally, the oil storage structure is provided with an oil storage cavity, the oil storage capacity of the oil storage cavity is not less than 4 g, and each oil conveying component is located inside the oil storage cavity;
and the end parts of the two ends of each oil conveying part correspondingly penetrate through the end parts of the two ends of the oil storage structure respectively so as to be correspondingly communicated with the oil supply structure.
Optionally, each of the oil transfer parts is a capillary structure.
Optionally, the atomized oil supply component is a piezoelectric ceramic piece; the oil supply structure is provided with an oil supply cavity, and the piezoelectric ceramic piece is located on the surface of lubricating oil in the oil supply cavity and in contact with the surface of the lubricating oil.
Optionally, a plurality of through holes are formed in the piezoelectric ceramic piece, and the lubricating oil is atomized and sprayed out through the through holes.
Optionally, the aperture size of the plurality of through holes is in the order of micrometers.
Optionally, the active supplemental oil supply device further comprises: and the control circuit module is electrically connected with the atomized oil supply component, is positioned on a flywheel control circuit of the satellite flywheel and the control moment gyroscope, and is used for judging the film state of the lubricating oil on the bearing raceway according to the current values of the driving motors of the satellite flywheel and the control moment gyroscope, the bearing temperature of the bearing and the bearing vibration signal of the bearing, which are measured by the satellite flywheel, so as to control the time for supplementing the oil and the required oil supply amount.
Compared with the prior art, the invention has the following advantages:
(1) the invention provides an active supplementary oil supply device, which is applied to a bearing assembly of a flywheel and a control moment gyro, and comprises: the oil storage structure, the oil supply structure, the oil conveying parts and the atomized oil supply parts; each oil delivery component is communicated with the oil storage structure and the oil supply structure so as to deliver the lubricating oil stored in the oil storage structure to the oil supply structure; the atomized oil supply component is arranged in the oil supply structure and used for atomizing the lubricating oil in the oil supply structure and spraying the lubricating oil to the bearing raceway of the bearing assembly. Therefore, the atomized oil supply component provided by the invention breaks up the surface energy of the lubricating oil in the oil supply structure to generate micro liquid drops, and under the action of kinetic energy, the purpose of micro-supplementing atomized oil supply to the stationary raceway (bearing raceway) which is most needed by bearing lubrication is realized, and a series of problems caused by passive oil supply (centrifugal oil supply) in the prior art are solved, for example: the problems of low oil supply utilization rate and large lubricating oil loss caused by continuous oil supply are solved; the problem of vacuum volatilization loss of lubricating oil caused by an oil reservoir prepared by adopting a porous oil storage material; along with the throwing of the lubricating oil, the oil-containing quality in the oil storage device is reduced, the centrifugal force is reduced, the oil supply rate is reduced, and the problems of unstable oil supply and even no oil discharge are caused; the problem of poor lubricating effect is caused by the fact that centrifugal force is not enough to throw out lubricating oil at low rotating speed.
(2) Each oil delivery part adopted by the invention is of a capillary structure, and reliable lubricating oil delivery is realized in a narrow structural space under a vacuum weightless environment, so that the oil delivery part is not suitable for adopting a pump or a motor driving device and is limited by weightless conditions, the lubricating oil delivery cannot be realized by the design of a conventional hydraulic pump, and the reliability design of motor driving is difficult to ensure. The invention adopts the capillary structure to communicate the oil storage cavity and the oil supply cavity to be used as an oil delivery device, when the adhesive force between liquid and the wall of the capillary is larger than the cohesive force between liquid molecules, the liquid rises along the liquid surface of the capillary, the capillary phenomenon occurs, and the lubricating oil is delivered to the oil supply structure from the oil storage structure. Therefore, the purpose that the lubricating oil can be actively conveyed from the oil storage structure to the oil supply structure by utilizing the capillary phenomenon of the capillary material under the vacuum and weightless space environment is realized, and the structural complexity of the active supplementary oil supply device is simplified.
(3) The oil storage structure is provided with the oil storage cavity, the oil storage capacity of the oil storage cavity is not less than 4 g, and the requirement of a flywheel bearing for more than 15 years can be met; specifically, an active oil supply mode is adopted to lubricate the rolling bearing with the long service life, and the on-orbit service life of the flywheel can be prolonged from 5 years to more than 15 years.
(4) The atomized oil supply component is a piezoelectric ceramic piece; the oil supply structure is provided with an oil supply cavity, and the piezoelectric ceramic piece is located on the surface of lubricating oil in the oil supply cavity and in contact with the surface of the lubricating oil. Therefore, the volume of the active oil supply device is reduced and the structural complexity is reduced due to the small volume and the high response speed of the piezoelectric ceramic plate, the piezoelectric ceramic plate is selected, an advanced laser drilling process is adopted, a plurality of micropores are drilled on the piezoelectric ceramic plate, the surface energy of liquid molecules (the surface energy of lubricating oil) is scattered through the high-frequency resonance of the ceramic plate by utilizing the high-frequency oscillation of electrons, so that tiny liquid drops are generated, and the atomized oil supply is realized under the dual actions of kinetic energy and extrusion. Because it has certain kinetic energy, so can point to certain direction and realize atomizing fuel feeding. The purpose of supplying oil to the most needed static roller path for bearing lubrication is realized.
(5) The active supplementary oil supply device provided by the invention also comprises: and the control circuit module is electrically connected with the atomized oil supply component, is positioned on a flywheel control circuit of the satellite flywheel and the control moment gyroscope, and is used for judging the film state of the lubricating oil on the bearing raceway according to the current values of the driving motors of the satellite flywheel and the control moment gyroscope, the bearing temperature of the bearing and the bearing vibration signal of the bearing, which are measured by the satellite flywheel, so as to control the time for supplementing the oil and the required oil supply amount. Therefore, the invention realizes the fine control of the bearing lubrication supplementary oil supply (namely the current required oil supply amount) through a fuzzy control algorithm, and in the on-orbit operation stage, the supplementary oil supply control can be realized by designing a closed-loop automatic control circuit, and also can be realized by ground manual remote measurement and remote control, namely, an oil supply signal is transmitted to the control circuit module through the ground manual remote measurement and remote control, the control circuit module can calculate the required oil supply amount by adopting the fuzzy control algorithm after receiving the oil supply signal, the time for supplementing the oil supply is obtained according to the oil supply signal, the operation of supplying the oil to the bearing raceway is executed, and the purpose of actively supplying the oil is realized.
Drawings
Fig. 1 is a schematic cross-sectional view illustrating an active supplemental oil supply device according to an embodiment of the present invention.
Detailed Description
The active supplementary oil supply device according to the present invention will be described in detail with reference to fig. 1 and the following detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it is to be understood that the terms "center," "height," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1, the active supplemental oil supply apparatus of the present embodiment is applied to a bearing assembly 100 of a flywheel and a control moment gyro, and includes: the oil storage structure 400, the oil supply structure 300, the plurality of oil transportation parts 500 and the atomized oil supply part 600; each of the oil delivery units 500 communicates the oil storage structure 400 and the oil supply structure 300 to deliver the lubricating oil (not shown) stored in the oil storage structure 400 into the oil supply structure 300; the atomized oil supply unit 600 is disposed inside the oil supply structure 300, and is used for atomizing the lubricating oil in the oil supply structure 300 and spraying the lubricating oil to the bearing raceway (not shown) of the bearing assembly 100. Therefore, the atomized oil supply component provided by the embodiment breaks up the surface energy of the lubricating oil in the oil supply structure to generate micro liquid drops, and the micro liquid drops are sprayed to the bearing raceway under the action of kinetic energy, so that the aims of supplying oil to the bearing raceway in a micro-supplementing manner and prolonging the service life of the bearing are fulfilled. The purpose of supplementing atomized oil supply to the most needed static roller path (bearing roller path) for bearing lubrication is realized, and a series of problems caused by passive oil supply (centrifugal oil supply) in the prior art are solved, such as: the problems of low oil supply utilization rate and large lubricating oil loss caused by continuous oil supply are solved; the problem of vacuum volatilization loss of lubricating oil caused by an oil reservoir prepared by adopting a porous oil storage material; along with the throwing of the lubricating oil, the oil-containing quality in the oil storage device is reduced, the centrifugal force is reduced, the oil supply rate is reduced, and the problems of unstable oil supply and even no oil discharge are caused; the problem of poor lubricating effect is caused by the fact that centrifugal force is not enough to throw out lubricating oil at low rotating speed.
Optionally, the oil storage structure 400 and the oil supply structure 300 are disposed between the rotating spacer 200 and the stationary spacer 201 of the bearing assembly 100, and both are in interference contact with the stationary spacer 201. That is, the active oil supply device provided in this embodiment is installed on the stationary spacer 201 of the bearing assembly 100 and is stationary with respect to the flywheel (satellite), that is, the oil storage structure 400 and the oil supply structure 300 are both stationary with respect to the stationary spacer 201, so that it is known that the oil supply device does not supply oil by using the centrifugal force of the outer ring of the bearing, and thus the passive oil supply device is different from the passive oil supply device in the related art in that the oil supply device is installed on the outer ring of the bearing and rotates at a high speed therewith, and the lubricant oil in the oil reservoir is thrown out by using the centrifugal force to supply lubricant to the bearing raceway.
Alternatively, in this embodiment, the oil supply structures 300 are two and are respectively located at two ends of the oil storage structure 400, and the injection positions correspond to bearing raceways of a bearing (not numbered in the figure) provided in the bearing assembly 100. As shown in fig. 1, the two bearings are respectively located at the upper and lower ends of the stationary spacer 201.
Optionally, in this embodiment, the oil storage structure is provided with an oil storage cavity, the oil storage capacity of the oil storage cavity is not less than 4 g, and each of the oil delivery parts 500 is located inside the oil storage cavity. Therefore, in the embodiment, the oil storage amount of the oil storage cavity is not less than 4 g, and the requirement of the flywheel bearing for more than 15 years can be met; specifically, an active oil supply mode is adopted to lubricate the rolling bearing with the long service life, and the on-orbit service life of the flywheel can be prolonged from 5 years to more than 15 years.
Both end portions of each of the oil transportation members 500 respectively and correspondingly penetrate both end portions of the oil storage structure 400 to correspondingly communicate with the oil supply structure 300. That is, the end of the oil delivery member 500 extends from the inside of the oil storage chamber of the oil storage structure 400 to the inside of an oil supply chamber provided in the oil supply structure.
Optionally, in this embodiment, the oil transportation component 500 is a capillary tube. Therefore, the lubricating oil conveying is reliably realized in a narrow structural space under a vacuum weightless environment, the pump or the motor driving device is not suitable to be adopted and is limited by weightless conditions, the lubricating oil conveying cannot be realized by the conventional hydraulic pump design, and the reliability design of the motor driving is difficult to ensure. The invention adopts the capillary tube to communicate the oil storage cavity and the oil supply cavity as the oil delivery device, when the adhesive force between the liquid and the capillary tube wall is larger than the cohesive force between liquid molecules, the liquid rises along the liquid surface of the capillary tube, the capillary phenomenon occurs, and the lubricating oil is delivered to the oil supply structure from the oil storage structure. Therefore, the purpose that the lubricating oil can be actively conveyed from the oil storage structure to the oil supply structure by utilizing the capillary phenomenon of the capillary material under the vacuum and weightless space environment is realized, and the structural complexity of the active supplementary oil supply device is simplified.
Optionally, the atomized oil supply component 600 is a piezoelectric ceramic piece; the piezoelectric ceramic piece is positioned on the surface of the lubricating oil in the oil supply cavity and is in contact with the surface of the lubricating oil.
Optionally, a plurality of through holes (not shown in the figure) are formed in the piezoelectric ceramic piece, and the lubricating oil is atomized and sprayed out through the through holes.
Optionally, the aperture size of the plurality of through holes is in the order of micrometers. Therefore, the atomized oil supply unit 600 provided in this embodiment has a small volume and a fast response speed, so that the volume of the active oil supply device is reduced and the structural complexity is reduced, and a piezoelectric ceramic plate is selected, an advanced laser drilling process is adopted, a plurality of micropores are drilled on the piezoelectric ceramic plate, and the surface energy of liquid molecules (the surface energy of lubricating oil) is scattered by high-frequency oscillation of the ceramic plate through high-frequency resonance of the ceramic plate to generate micro droplets, and the micro droplets are sprayed to the bearing raceway under the dual actions of kinetic energy and extrusion, so as to realize micro-supplement oil supply to the bearing raceway. Because it has certain kinetic energy, so can point to certain direction and realize atomizing fuel feeding. The purpose of supplying oil to the most needed static roller path for bearing lubrication is realized.
Optionally, the active supplemental oil supply device further comprises: and the control circuit module (not shown in the figure) is electrically connected with the atomized oil supply component, is positioned on a flywheel control circuit of the flywheel and the control moment gyro, and is used for judging the film state of the lubricating oil on the bearing raceway according to the current values of the driving motors of the flywheel and the control moment gyro, the bearing temperature of the bearing and the bearing vibration signal of the bearing, which are measured by the flywheel, so as to control the time for supplementing oil and the required oil supply amount.
Specifically, since the active supplementary oil supply device provided by this embodiment is stationary with respect to the flywheel, the active oil supply device circuit line and the motor line for controlling the rotation of the bearing can be connected to the flywheel control circuit board together through the spindle, and the active oil supply device control circuit module is disposed on the flywheel control circuit board. In the aspect of monitoring the running state of the bearing, comprehensive consideration is given to that the condition that the wire connection is difficult to realize in a contact type oil film resistance direct measurement mode, other non-contact measurement methods are complex to realize and are not very sensitive to the thickness of the oil film, so that the condition of the lubricating oil film of the bearing is judged by utilizing the functions of measuring the current value of a driving motor, the temperature of the bearing, a vibration signal of the bearing and the like by a flywheel to control the time of supplying oil and the oil supply amount. Aiming at the characteristics of multi-factor influence of bearing lubrication and more complex variable control, a fuzzy control algorithm is adopted, a large number of experiments are carried out at the ground stage to obtain a large number of data, the fine control of the bearing lubrication supplement oil supply is realized through fuzzy control, and the supplement oil supply control can be realized through a closed-loop automatic control circuit arranged at the on-orbit operation stage and can also be realized through ground manual remote measurement and remote control.
Therefore, the invention realizes the fine control of the bearing lubrication supplementary oil supply (namely the current required oil supply amount) through a fuzzy control algorithm, and in the on-orbit operation stage, the supplementary oil supply control can be realized by designing a closed-loop automatic control circuit, and also can be realized by ground manual remote measurement and remote control, namely, the control circuit module is expected to transmit an oil supply signal through ground manual remote measurement and remote control, the control circuit module can calculate the required oil supply amount by adopting the fuzzy control algorithm after receiving the oil supply signal, and the operation of supplying oil to the bearing raceway is executed according to the supplement oil supply time obtained by the oil supply signal, so that the aim of actively supplying oil is realized.
In summary, (1) the present invention provides an active supplemental oil supply device for a bearing assembly of a satellite flywheel and a control moment gyro, comprising: the oil storage structure, the oil supply structure, the oil conveying parts and the atomized oil supply parts; each oil conveying component is communicated with the oil storage structure and the oil supply structure so as to convey the lubricating oil stored in the oil storage structure into the oil supply structure; the atomized oil supply component is arranged in the oil supply structure and used for atomizing the lubricating oil in the oil supply structure and spraying the lubricating oil to the bearing raceway of the bearing assembly. Therefore, the atomized oil supply component provided by the invention breaks up the surface energy of the lubricating oil in the oil supply structure to generate micro liquid drops, thereby achieving the purpose of supplementing atomized oil supply to the most needed static roller path (bearing roller path) for bearing lubrication, and solving a series of problems caused by passive oil supply (centrifugal oil supply) in the prior art, such as: the problems of low oil supply utilization rate and large lubricating oil loss caused by continuous oil supply are solved; the problem of vacuum volatilization loss of lubricating oil caused by an oil reservoir prepared by adopting a porous oil storage material; along with the throwing of the lubricating oil, the oil-containing quality in the oil storage device is reduced, the centrifugal force is reduced, the oil supply rate is reduced, and the problems of unstable oil supply and even no oil discharge are caused; the problem of poor lubricating effect is caused by the fact that centrifugal force is not enough to throw out lubricating oil at low rotating speed.
(2) Each oil delivery part adopted by the invention is of a capillary structure, and reliable lubricating oil delivery is realized in a narrow structural space under a vacuum weightless environment, so that the oil delivery part is not suitable for adopting a pump or a motor driving device and is limited by weightless conditions, the lubricating oil delivery cannot be realized by the design of a conventional hydraulic pump, and the reliability design of motor driving is difficult to ensure. The invention adopts the capillary structure to communicate the oil storage cavity and the oil supply cavity to be used as an oil delivery device, when the adhesive force between liquid and the wall of the capillary is larger than the cohesive force between liquid molecules, the liquid rises along the liquid surface of the capillary, the capillary phenomenon occurs, and the lubricating oil is delivered to the oil supply structure from the oil storage structure. Therefore, the purpose that the lubricating oil can be actively conveyed from the oil storage structure to the oil supply structure by utilizing the capillary phenomenon of the capillary material under the vacuum and weightless space environment is realized, and the structural complexity of the active supplementary oil supply device is simplified.
(3) The oil storage structure is provided with the oil storage cavity, the oil storage capacity of the oil storage cavity is not less than 4 g, and the requirement of a flywheel bearing for more than 15 years can be met; specifically, an active oil supply mode is adopted to lubricate the rolling bearing with the long service life, and the on-orbit service life of the flywheel can be prolonged from 5 years to more than 15 years.
(4) The atomized oil supply component is a piezoelectric ceramic piece; the oil supply structure is provided with an oil supply cavity, and the piezoelectric ceramic piece is located on the surface of lubricating oil in the oil supply cavity and in contact with the surface of the lubricating oil. Therefore, the volume of the active oil supply device is reduced and the structural complexity is reduced due to the small volume and the high response speed of the piezoelectric ceramic plate, the piezoelectric ceramic plate is selected, an advanced laser drilling process is adopted, a plurality of micropores are drilled on the piezoelectric ceramic plate, the high-frequency oscillation is utilized, the high-frequency resonance of the ceramic plate is utilized, the surface energy of liquid molecules is scattered, so that tiny liquid drops are generated, and the atomized oil supply is realized under the dual effects of kinetic energy and extrusion. Because it has certain kinetic energy, so can point to certain direction and realize atomizing fuel feeding. The purpose of supplying oil to the most needed static roller path for bearing lubrication is realized.
(5) The active supplementary oil supply device provided by the invention also comprises: and the control circuit module is electrically connected with the atomized oil supply component, is positioned on a flywheel control circuit of the flywheel and the control moment gyroscope, and is used for judging the film state of the lubricating oil on the bearing raceway according to the current values of the driving motors of the flywheel and the control moment gyroscope, the bearing temperature of the bearing and the bearing vibration signal of the bearing, which are measured by the flywheel, so as to control the time of supplementing oil and the required oil supply amount. Therefore, the invention realizes the fine control of the bearing lubrication supplementary oil supply (namely the current required oil supply amount) through a fuzzy control algorithm, and in the on-orbit operation stage, the supplementary oil supply control can be realized by designing a closed-loop automatic control circuit, and also can be realized by ground manual remote measurement and remote control, namely, the control circuit module is expected to transmit an oil supply signal through ground manual remote measurement and remote control, the control circuit module can calculate the required oil supply amount by adopting the fuzzy control algorithm after receiving the oil supply signal, and the operation of supplying oil to the bearing raceway is executed according to the supplement oil supply time obtained by the oil supply signal, so that the aim of actively supplying oil is realized.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
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| CN112742720A (en) * | 2020-11-30 | 2021-05-04 | 上海航天控制技术研究所 | Centrifugal supplementary oil supply device and method based on micropore oil supply |
| CN112943805A (en) * | 2021-04-19 | 2021-06-11 | 大连理工大学 | Lubricating grease supply device for space precision bearing and design method thereof |
| CN113669372A (en) * | 2021-08-23 | 2021-11-19 | 北京微纳星空科技有限公司 | A bearing and bearing oil supply device |
| CN114370456A (en) * | 2021-12-13 | 2022-04-19 | 上海航天控制技术研究所 | Microporous supplementary lubrication device for bearing with long space life |
| CN115045910A (en) * | 2022-05-24 | 2022-09-13 | 清华大学 | Self-detection and self-feedback intelligent joint bearing |
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