CN114370456A - Microporous supplementary lubrication device for bearing with long space life - Google Patents
Microporous supplementary lubrication device for bearing with long space life Download PDFInfo
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- CN114370456A CN114370456A CN202111521015.9A CN202111521015A CN114370456A CN 114370456 A CN114370456 A CN 114370456A CN 202111521015 A CN202111521015 A CN 202111521015A CN 114370456 A CN114370456 A CN 114370456A
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- bearing
- cavity
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- 238000005461 lubrication Methods 0.000 title claims abstract description 27
- 239000003921 oil Substances 0.000 claims abstract description 165
- 239000010687 lubricating oil Substances 0.000 claims abstract description 20
- 239000011148 porous material Substances 0.000 claims abstract description 12
- 125000006850 spacer group Chemical group 0.000 claims abstract description 10
- 230000004323 axial length Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 230000000153 supplemental effect Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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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
- F16C33/664—Retaining the liquid in or near the bearing
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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
Abstract
The invention provides a microporous supplementary lubrication device for a bearing with long space and service life, which is arranged between paired bearings and comprises an oil cavity inner wall, an oil cavity outer wall arranged on the periphery of the oil cavity inner wall, a delay ring arranged on the periphery of the oil cavity outer wall and an outer spacer ring arranged on the periphery of the delay ring; the inner wall of the oil cavity is matched with the outer wall of the oil cavity, and a closed oil storage cavity is formed between the inner wall of the oil cavity and the outer wall of the oil cavity; the outer wall of the oil cavity is in a hollow cylindrical shape, the wall thickness of the side surface of the oil cavity changes along the axial direction, and a plurality of micropores are formed in the side surface of the outer wall of the oil cavity; the time delay ring is matched with the outer wall of the oil cavity and is tightly attached to the outer wall of the oil cavity, and the time delay ring is made of porous materials and can temporarily store lubricating oil. The supplementary lubrication device for the bearing can realize uniform and stable oil supply for a long time.
Description
Technical Field
The invention belongs to the technical field of aerospace bearings, and relates to a microporous supplementary lubricating device for a bearing with a long space service life.
Background
Along with the increasing of the orbit number of satellites and the continuous deepening of the space technology in China, more severe requirements are provided for the space rotating mechanism, and the development trend of high precision, low energy consumption and long service life of more than 10 years is imperative. The space bearing is a core part of the actuating mechanism, and the performance and the service life of the bearing directly influence the service life and the reliability of the rotating mechanism and the satellite platform.
The failure modes of the space bearing are mainly lubrication failure and wear failure which are specific to the space environment. The characteristic that the space environment can not be maintained regularly leads to the difficulty in continuous supply of lubricating oil, so that a bearing contact micro-area is in a boundary lubrication state or even a dry friction state all the year round, bearing abrasion, friction torque fluctuation, serious heating or even complete failure are caused, and the service life is seriously restricted.
At present, the space bearing utilizes an oil storage ring made of porous materials to realize long-life supplementary oil supply. However, the oil supply rate of the porous material is not controllable, a large amount of lubricating oil is thrown out by centrifugal force in a high-speed state, the oil supply rate greatly fluctuates, once the bearing runs at a high speed, oil is supplied, the oil supply amount is excessive in the initial service stage, the viscous resistance is increased, the power consumption of the bearing is increased, the friction torque is increased, and the heating is serious, and in the later service stage, the oil supply is invalid due to the early precipitation and consumption of the lubricating oil in the oil storage ring.
The oil outlet rate of the oil storage ring is also extremely unstable under the complex working condition of the space. At present, an oil storage ring is adopted to supplement oil, so that the lubricating requirement of 5-8 years can be ensured, a large difference is still kept between the lubricating life of more than 10 years, and the continuous lubricating supply under the long-life requirement becomes a technical bottleneck.
In addition, a core valve type oil reservoir exists at present, wherein a core valve material is formed by hot pressing of resin glue and pure cotton cloth, but due to the fact that the core valve material is non-uniform, the oil supply rate is unstable, the core valve and an oil cavity (stainless steel material) are glued and connected through glue, the core valve and the oil cavity are sealed unreliable under the conditions of multiple high-temperature and low-temperature cycles and negative pressure, oil leakage is caused, the oil supply amount is out of control, the performance of a bearing is affected, and the obvious leakage phenomenon of the oil reservoir can be found in tests.
The invention provides a microporous supplementary lubrication device for a bearing with long space service life, which can effectively improve the current situation.
Disclosure of Invention
The current supplementary lubrication device for the space bearing can not stably supply oil for a long time, and the oil supply is invalid after a long time, so that the problem that the existing space long-life bearing is difficult to lubricate in a space environment is solved.
In order to achieve the purpose, the invention provides a microporous supplementary lubrication device for a bearing with long space and service life, which is arranged between paired bearings and comprises an oil cavity inner wall, an oil cavity outer wall arranged on the periphery of the oil cavity inner wall, a delay ring arranged on the periphery of the oil cavity outer wall and an outer spacer ring arranged on the periphery of the delay ring; the inner wall of the oil cavity is matched with the outer wall of the oil cavity, and a closed oil storage cavity is formed between the inner wall of the oil cavity and the outer wall of the oil cavity; the outer wall of the oil cavity is in a hollow cylindrical shape, the wall thickness of the side surface of the oil cavity changes along the axial direction, and a plurality of micropores are formed in the side surface of the outer wall of the oil cavity; the time delay ring is matched with the outer wall of the oil cavity and is tightly attached to the outer wall of the oil cavity, and the time delay ring is made of porous materials and can temporarily store lubricating oil.
Preferably, the outer wall of the oil cavity and the delay ring are detachably connected with the outer space ring; and the inner wall of the oil cavity and the outer wall of the oil cavity are welded to form a closed oil storage cavity.
Preferably, the section of the outer wall of the oil cavity is in an arch bridge shape, and the wall thickness is L at most1Wall thickness of L3' and a plurality of micropores are uniformly distributed on the circumference of the outer wall of the oil cavity at the minimum wall thickness at equal intervals.
Preferably, the micropores are through holes, the aperture is 30 μm, and the length of the hole is L3′。
Preferably, the number of the micropores is 4.
Preferably, the annular side surface of the outer wall of the oil cavity is provided with an oil filling hole, the oil filling hole is matched with the oil filling nozzle, and lubricating oil can be filled into the oil storage cavity through the oil filling hole.
Preferably, the wall thickness of the outer wall of the oil chamber is L1A plurality of first connecting holes are formed in the part of the connecting piece; the delay ring is provided with a plurality of second connecting holes corresponding to the first connecting holes; and the outer space ring is provided with a plurality of third connecting holes corresponding to the second connecting holes.
Preferably, the oil chamber outer wall, the delay ring and the outer spacer are connected by screws passing through the plurality of first connecting holes, the plurality of second connecting holes and the plurality of third connecting holes.
Preferably, the delay ring is made of porous polyimide material, the aperture of each hole in the delay ring is 0.8-1.2 mu m, and the porosity is 30%
Preferably, the inner diameter of the inner wall of the oil cavity is larger than that of the bearing, and the axial length of the inner wall of the oil cavity is 2-4 times that of the bearing.
In conclusion, compared with the prior art, the invention adopts the micropores to realize the control of the oil supply rate, and can strictly control the oil supply rate, so that the device can realize uniform and stable oil supply for more than 10 years; the outer wall of the oil cavity forms a certain inclination angle, and the micropores are arranged at the positions with the largest radial size, so that all lubricating oil in the oil cavity can be effectively utilized, the phenomenon that residual oil cannot flow out is avoided, and the oil supply time is guaranteed to the maximum extent; the time delay ring made of porous material can supply lubricating oil to required position accurately; the micro-pores can be used to vent internal air when filling with lubricant, thus avoiding difficulties in filling and detecting lubricant.
Drawings
FIG. 1 is an axial cross-sectional view of a microporous supplemental lubrication device for a long-life bearing in space according to the present invention;
FIG. 2 is a partial axial cross-sectional view of a microporous supplemental lubrication device for a space long-life bearing according to the present invention.
Detailed Description
Technical solutions, structural features, achieved objects and effects in the embodiments of the present invention will be described in detail below with reference to fig. 1 to 2 in the embodiments of the present invention.
It should be noted that the drawings are simplified in form and not to precise scale, and are only used for convenience and clarity to assist in describing the embodiments of the present invention, but not for limiting the conditions of the embodiments of the present invention, and therefore, the present invention is not limited by the technical spirit, and any structural modifications, changes in the proportional relationship, or adjustments in size, should fall within the scope of the technical content of the present invention without affecting the function and the achievable purpose of the present invention.
It is to be noted that, in the present invention, relational terms such as first and second, and the like are 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.
A microporous supplementary lubrication device for a bearing with a long space and a long service life is hollow cylindrical, as shown in figure 1, the figure is an axial sectional view of the microporous supplementary lubrication device of the embodiment, the supplementary lubrication device is arranged between a pair of bearings 5, two circular ring-shaped end walls are tightly attached to the two bearings 5 and are coaxially installed with the bearings 5, the microporous supplementary lubrication device comprises a cylindrical oil cavity inner wall 1, an oil cavity outer wall 2 arranged on the periphery of the oil cavity inner wall 1, a delay ring 3 arranged on the periphery of the oil cavity outer wall 2 and an outer spacer ring 4 arranged on the periphery of the delay ring 3, and the oil cavity outer wall 2, the delay ring 3 and the outer spacer ring 4 are connected through 4 screws.
The inner wall 1 of the oil cavity is a thin-wall hollow cylinder, the inner diameter of the thin-wall hollow cylinder is larger than that of the bearing 5, and the axial length of the thin-wall hollow cylinder is 2-4 times that of the bearing 5. The outer wall 2 of the oil chamber is in a hollow cylinder shape, and the axial length of the outer wall 2 of the oil chamber is equal to that of the oil chamberThe axial lengths of the inner walls 1 of the oil chambers are the same, as shown in fig. 2, the sections of the outer walls 2 of the oil chambers are in an arch bridge shape, and the wall thicknesses are axially changed and symmetrically distributed; the wall thickness L is maximum at both sides of the oil chamber outer wall 21At a distance L from the two ends of the oil chamber outer wall 24The thickness of the part (A) is L1-L2The wall of the oil chamber outer wall 2 is thinnest at the axial middle part and has a wall thickness L1-L3The wall thickness gradually decreases from the position A to the middle position of the axial outer wall 2; the outer diameter of the oil chamber inner wall 1 is the same as the minimum inner diameter of the oil chamber outer wall 2, so that the oil chamber inner wall 1 and the oil chamber outer wall 2 can form a closed arch bridge-shaped oil storage chamber. The delay ring 3 is matched with the oil cavity outer wall 2, the axial length of the delay ring is the same as that of the oil cavity outer wall 2, the inner diameter of the delay ring is the same as that of the oil cavity outer wall 2, therefore, the delay ring 3 can be tightly attached to the oil cavity outer wall 2, the delay ring 3 is made of porous polyimide materials, the aperture of each hole in the delay ring 3 is 0.8-1.2 mu m, and the porosity is 30%. The outer space ring 4 is matched with the delay ring 3, and the inner diameter of the outer space ring is the same as the outer diameter of the delay ring 3, so that the outer space ring 4 is tightly attached to the delay ring 3.
The oil cavity inner wall 1 and the oil cavity outer wall 2 are made of aluminum alloy, and the oil cavity inner wall 1 and the oil cavity outer wall 2 are welded to form an oil storage cavity; the wall thickness at two ends of the oil cavity outer wall 2 is L1The oil chamber outer wall 2 is provided with 4 first connecting holes, wherein each end of the oil chamber outer wall is provided with two first connecting holes, and the two connecting holes at the same end are symmetrical about the central axis of the oil chamber outer wall 2; the delay ring 3 is provided with 4 second connecting holes matched with the 4 first connecting holes; the outer space ring 4 is made of 9Cr18 stainless steel, and 4 third connecting holes corresponding to the first connecting holes and the second connecting holes are formed in the outer space ring 4. The second connecting hole and the third connecting hole are through holes, and the oil cavity outer wall 2, the delay ring 3 and the outer space ring 4 can be fixedly connected through 4 screws matched with the first connecting hole, the second connecting hole and the third connecting hole and penetrating through the connecting holes; because the inner oil cavity wall 1 is welded with the outer oil cavity wall 2, the inner oil cavity wall 1, the outer oil cavity wall 2, the time delay ring 3 and the outer spacer ring 4 can be connectedAre connected into a whole.
The maximum wall thickness L of the oil chamber outer wall 2 in the present embodiment14.5mm, minimum wall thickness L3′＝L1-L30.5mm, and a wall thickness L at A2′＝L1-L21mm, the thickness L of the circular ring-shaped side surface of the outer wall 2 of the oil chamber4Is 6 mm; the inner diameter of the inner wall 1 of the oil cavity is 26mm, the outer diameter of the inner wall is 28mm, and the axial length of the inner wall is 38 mm; the minimum inner diameter of the oil chamber outer wall 2 is 28mm, and the outer diameter is 36 mm; the inner diameter of the delay ring 3 is 36mm, and the outer diameter of the delay ring is 38 mm; the inner diameter of the outer space ring 4 is 38mm, and the outer diameter is 42 mm; in this embodiment the bearing has an outer diameter of 42mm, an inner diameter of 20mm and an axial length of 12 mm.
An oil filling hole is formed in the circular side face of the outer wall 2 of the oil cavity, the oil filling hole is a threaded through hole, threads on the inner wall of the oil filling hole are matched with the oil filling nozzle, lubricating oil can be filled into the oil storage cavity through the oil filling hole, and the oil filling hole is sealed through a screw after oil filling is finished, so that the lubricating oil is prevented from leaking from the oil filling hole; according to the design of an oil supply path, 4 micropores are formed on the circumference of the maximum inner diameter of the outer wall 2 of the oil cavity (namely the circumference with the wall thickness of 0.5 mm), the micropores are distributed at equal intervals, are through holes, have the aperture of 30 mu m and the length of 0.5mm, and can be used for discharging air in the oil storage cavity during oil injection so as to ensure that lubricating oil is smoothly filled.
After the supplementary lubrication device of the present embodiment is installed between the pair of bearings 5, lubricating oil is injected into the oil storage chamber through the oil injection hole, and then the oil injection hole is sealed with a screw; when the bearing assembly rotates around the shaft, the microporous supplementary lubrication device also rotates at the same speed, under the action of centrifugal force and thermal effect, lubricating oil in the oil storage cavity leaks through 4 micropores and is continuously injected into the delay ring 3 at a slow and uniform speed, because the delay ring 3 is made of porous material, the outer spacer ring 4 is made of 9Cr18 stainless steel, and the lubricating oil is temporarily stored in the delay ring 3 and forms transition fit with the oil storage cavity; when the lubricating oil in the delay ring 3 reaches a saturated state, the lubricating oil cannot pass through the outer space ring 4 and continuously flows out of the micropores, so that the lubricating oil is separated out of the delay ring 3 and is supplied to the space bearing needing to be lubricated.
Because the 4 micropores are formed on the circumference of the thinnest part of the outer wall 2 of the oil cavity, the lubricating oil in the oil storage cavity can be utilized to the maximum extent; because the micropore size is minimum, can strictly control the oil supply rate to the maximize guarantees oil supply time, makes the even stable oil supply of device realization more than 10 years.
In the embodiment, the micro-holes are formed by adopting a femtosecond processing technology, laser is focused on the surface of the outer wall 2 of the oil cavity by utilizing a high-speed scanning module and a focusing system, and a focused light spot is axially fed in a spiral line high-speed rotation matched mode to realize spiral drilling.
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)
1. A microporous supplementary lubrication device for a bearing with long space and service life is arranged between paired bearings (5), and is characterized by comprising an oil cavity inner wall (1), an oil cavity outer wall (2) arranged at the periphery of the oil cavity inner wall (1), a delay ring (3) arranged at the periphery of the oil cavity outer wall (2) and an outer spacer ring (4) arranged at the periphery of the delay ring (3);
the inner oil cavity wall (1) is matched with the outer oil cavity wall (2), and a closed oil storage cavity is formed between the inner oil cavity wall (1) and the outer oil cavity wall (2);
the oil cavity outer wall (2) is in a hollow cylindrical shape, the wall thickness of the side surface changes along the axial direction, and a plurality of micropores are formed in the side surface of the oil cavity outer wall (2);
the delay ring (3) is matched with the oil cavity outer wall (2) and is tightly attached to the oil cavity outer wall (2), and the delay ring (3) is made of porous materials and can temporarily store lubricating oil.
2. The microporous supplementary lubrication device for the bearing with long space and life as claimed in claim 1, wherein the outer wall (2) of the oil chamber, the time-delay ring (3) and the outer spacer ring (4) are detachably connected; and the inner wall (1) of the oil cavity and the outer wall (2) of the oil cavity are welded to form a closed oil storage cavity.
3. The microporous supplementary lubrication device for a space long-life bearing as claimed in claim 2, wherein said oil chamber outer wall (2) has a cross section of an arch bridge shape and a wall thickness of at most L1Wall thickness of L3', a plurality of said micro-holes are evenly distributed at equal intervals on the circumference of the oil chamber outer wall (2) where the wall thickness is smallest.
4. The microporous supplementary lubrication device for a space long-life bearing as claimed in claim 3, wherein said micropores are through holes having a pore diameter of 30 μm and a pore length L3′。
5. The microporous supplemental lubrication device for a space long life bearing according to claim 4, wherein the number of micropores is 4.
6. The micro-porous supplementary lubrication device for a bearing with a long space life as claimed in claim 1, wherein the annular side of the outer wall (2) of the oil chamber is provided with an oil hole which is matched with an oil nozzle and through which lubricating oil can be injected into the oil chamber.
7. The microporous supplementary lubrication device for a space long-life bearing as claimed in claim 2, wherein said oil chamber outer wall (2) has a wall thickness of L1A plurality of first connecting holes are formed in the part of the connecting piece; the delay ring (3) is provided with a plurality of second connecting holes corresponding to the first connecting holes; and the outer space ring (4) is provided with a plurality of third connecting holes corresponding to the second connecting holes.
8. The micro-porous supplementary lubrication device for a space long-life bearing as claimed in claim 7, wherein said oil chamber outer wall (2), said time-delay ring (3) and said outer spacer (4) are connected by screws through a plurality of said first connecting hole, said second connecting hole and said third connecting hole.
9. The microporous supplementary lubrication device for a space long-life bearing according to claim 1, wherein the delay ring (3) is made of a porous polyimide material, and each pore in the delay ring (3) has a pore diameter of 0.8 to 1.2 μm and a porosity of 30%.
10. The micro-porous supplementary lubrication device for a space long-life bearing as claimed in claim 1, wherein the inner diameter of said oil chamber inner wall (1) is larger than the inner diameter of said bearing (5), and the axial length is 2 to 4 times the axial length of said bearing (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111521015.9A CN114370456A (en) | 2021-12-13 | 2021-12-13 | Microporous supplementary lubrication device for bearing with long space life |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111521015.9A CN114370456A (en) | 2021-12-13 | 2021-12-13 | Microporous supplementary lubrication device for bearing with long space life |
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| CN114370456A true CN114370456A (en) | 2022-04-19 |
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| CN202111521015.9A Pending CN114370456A (en) | 2021-12-13 | 2021-12-13 | Microporous supplementary lubrication device for bearing with long space life |
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| US20150071576A1 (en) * | 2013-09-11 | 2015-03-12 | Nippon Thompson Co., Ltd. | Linear motion guide unit |
| CN110608178A (en) * | 2018-06-14 | 2019-12-24 | 株式会社岛津制作所 | Vacuum pump |
| CN111075845A (en) * | 2020-01-08 | 2020-04-28 | 上海航天控制技术研究所 | Active supplementary oil supply unit |
| CN111365374A (en) * | 2020-04-28 | 2020-07-03 | 洛阳吉琳星信息科技有限公司 | Bearing lubricating trace oil supply device for momentum wheel |
| 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 | Bearing and bearing oil supply device |
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