CN107830176A - A kind of bearing positive pressure dust-proof structure - Google Patents
A kind of bearing positive pressure dust-proof structure Download PDFInfo
- Publication number
- CN107830176A CN107830176A CN201711306690.3A CN201711306690A CN107830176A CN 107830176 A CN107830176 A CN 107830176A CN 201711306690 A CN201711306690 A CN 201711306690A CN 107830176 A CN107830176 A CN 107830176A
- Authority
- CN
- China
- Prior art keywords
- bearing
- compressed air
- air
- spacer
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 125000006850 spacer group Chemical group 0.000 claims abstract description 43
- 230000001174 ascending effect Effects 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims description 29
- 238000010276 construction Methods 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims 1
- 239000000428 dust Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
-
- 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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
-
- 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
- F16C37/00—Cooling of bearings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses a kind of bearing positive pressure dust-proof structure, including bearing block, bearing, axle and spacer, spacer is mounted on an axle to be coordinated for interference fit, spacer with bearing block for gap；Bearing chamber cavity is formed between spacer and bearing, the hole being adapted to compressed air ascending pipe is provided with bearing block, the length that compressed air ascending pipe is inserted into bearing chamber cavity is more than the gap between spacer and bearing block.Compressed air ascending pipe connects with bearing chamber cavity, the compressed air of cleaning by compressed air ascending pipe injection bearing room cavity and forms malleation with 3kPa~5kPa relative pressures, due to existing malleation in bearing chamber cavity, compressed air in the gap between spacer and bearing block by flowing out, due to the effect of air-flow, dust, muddy water etc. is prevented to enter bearing chamber cavity, so as to reach dust-proof purpose.The compressed air of constant flow enhances the heat sinking function of bearing chamber, so as to reduce bearing temperature, improves the running environment of bearing, adds bearing life.
Description
Technical field
The invention belongs to technical field of bearings, and in particular to a kind of bearing positive pressure dust-proof structure.
Background technology
Bearing is that part that is fixed and reducing load coefficient of friction is played in mechanical transmission course, it may also be said to, when other
Parts when producing relative motion each other on axle, for reducing coefficient of friction and the holding shaft center in power transmission process
Fixed parts.Bearing is a kind of very important parts in contemporary plant equipment.Its major function is support machinery rotation
Swivel, to reduce mechanical load coefficient of friction of the equipment in transmission process.But bearing is a kind of working environment to be compared
Sensitive element, dust enter the grease and lubrication of meeting heavy damage bearing in bearing chamber, so as to be directed at bearing inordinate wear, added
Fast bearing failure, the dustproof construction of bearing so some enterprises begin one's study.
At present, bearing dustproof construction mainly has contact seal and dust-proof labyrinth two ways.Above two dustproof construction
It can only all accomplish passive dust-proof.For contact dustproof construction, dust still can be in the accumulation of the edge of contact dustproof construction simultaneously
Damage dustproof construction；For labyrinth type dustproof construction, dust still can be entered inside bearing chamber by the gap in labyrinth.Dust enters
Enter inside bearing chamber, aggravate the abrasion between rolling element and bearing outer ring and bearing inner race, cause bearing service life short, wear
Rate is high, and it is frequent to change number.
The content of the invention
For insufficient existing for prior art middle (center) bearing dustproof construction, it is an object of the invention to provide a kind of letter of structure
It is single, there is dust-proof and heat sinking function bearing positive pressure dust-proof structure, for solving after existing dustproof construction uses a period of time,
Dust still can be entered inside bearing chamber by gap, or dust is accumulated at the edge of dustproof construction and damages asking for dustproof construction
Topic.
To achieve the above object, the technical scheme is that：A kind of bearing positive pressure dust-proof structure, including bearing block, axle
Hold and axle, the bearing positive pressure dust-proof structure also include spacer, the spacer is fixedly sleeved on the shaft, the spacer and institute
State and bearing chamber cavity is formed between bearing, the hole being adapted to compressed air ascending pipe is provided with the bearing block.
Further, the spacer and the axle are interference fit, and the spacer coordinates with the bearing block for gap.
Further, the gap width between the spacer and the bearing block is 0.8mm~0.12mm.
Further, the compressed air ascending pipe connects with the bearing chamber cavity, and compressed air is empty through the compression
Gas ascending pipe enters in the bearing chamber cavity, then is discharged to air through the gap between the spacer and the bearing block
In.
Further, the compressed air ascending pipe be inserted into length in the bearing chamber cavity be more than the spacer with
Gap between the bearing block.
Further, the compressed air ascending pipe inject the pressure of the air of the bearing chamber cavity for 3kPa~
5kPa。
Further, the compressed air ascending pipe is connected with source of the gas, the source of the gas and the compressed air ascending pipe it
Between be sequentially provided with pressure regulator valve, air cleaner and air dryer, the pressure regulator valve, air cleaner and air dryer with
The compressed air ascending pipe connection.
Further, pressure of the compressed air that the source of the gas provides by pressure regulator valve control compressed air, then according to
Secondary that gas is filtered and dried by the air cleaner and the air dryer, the compression that finally clean is dried is empty
Gas described in compressed air ascending pipe entrance through arriving bearing chamber cavity.
Further, air pressure detection sensor I is provided with the bearing chamber cavity, in the row of the spacer compressed air
Go out side and be provided with air pressure detection sensor II.
Further, the air pressure detection sensor I detects the air pressure in the bearing chamber cavity, and the air pressure detection passes
Sensor II detects the air pressure on the outside of the bearing chamber cavity, is detected according to air pressure detection sensor I and air pressure detection sensor II
Numerical value, adjust the atmospheric pressure value that the pressure regulator valve ensures that the air pressure detection sensor I detects and be more than air pressure detection sensing
The atmospheric pressure value that device II detects.
The advantages of using technical solution of the present invention for：
1. due to existing malleation in bearing chamber cavity, compressed air by being flowed out in the gap between spacer and bearing block,
Due to the effect of air-flow, prevent dust, muddy water etc. to enter bearing chamber cavity, so as to reach dust-proof purpose, avoid axle
Hold lubrication failure and inordinate wear caused by dust and muddy water enter.
2. the compressed air of constant flow enhances the heat sinking function of bearing chamber, so as to reduce bearing temperature, axle is improved
The running environment held, add the service life of bearing.
3. passage is flowed out by the use of gap intrinsic between spacer and bearing block as compressed air, without processing compression in addition
Air flow pass, saves processing cost.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description：
Fig. 1 is that the overall structure of bearing positive pressure dust-proof structure of the present invention is intended to.
Mark in above-mentioned figure is respectively：1. bearing block；2. bearing；3. axle；4. spacer；5. compressed air ascending pipe；6.
Bearing chamber cavity；7. hole；8. source of the gas；9. pressure regulator valve；10. air cleaner；11. air dryer；12. air pressure detection sensor
Ⅰ；13. air pressure detection sensor II.
Embodiment
In the present invention, it is to be understood that term " length ", " width ", " on ", " under ", "front", "rear", " left side ",
" right side ", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumference "
Orientation or position relationship Deng instruction be based on orientation shown in the drawings or position relationship, be for only for ease of the description present invention and
Simplify description, rather than the device or element of instruction or hint meaning there must be specific orientation, with specific azimuth configuration
And operation, therefore be not considered as limiting the invention.
As shown in figure 1, arrow represents the flow direction of compressed air, a kind of bearing positive pressure dust-proof structure, including bearing block in figure
1st, bearing 2, axle 3 and spacer 4, spacer 4 is fixedly sleeved on axle 3, and spacer 4 is interference fit with axle 3, and spacer 4 is with bearing block 1
Gap coordinates；Bearing chamber cavity 6 is formed between spacer 4 and bearing 2, is provided with what is be adapted to compressed air ascending pipe 5 in bearing block 1
Hole 7.Compressed air ascending pipe 5 connects with bearing chamber cavity 6, and the compressed air injection tube 5 of compressed air enters bearing chamber sky
In chamber 6, then it is discharged in air through the gap between spacer 4 and bearing block 1.Between intrinsic between spacer 4 and bearing block 1
Gap flows out passage as compressed air, without processing compressed air outflow passage in addition, saves processing cost.Set by theory
Meter and verification experimental verification, the preferably gap width between spacer 4 and bearing block 1 be 0.8mm~0.12mm, if spacer 4 and bearing block 1 it
Between gap cross conference and cause dust-proof effect to be deteriorated, big gap inherently makes air stream quantitative change cause the wave of compressed air greatly
Take；If the gap between spacer 4 and bearing block 1 is too small, although good dustproof effect can increase processing cost.Consider anti-
Dirt effect and processing cost problem, so the gap width between selection spacer 4 and bearing block 1 is 0.8mm~0.12mm.
Above-mentioned compressed air ascending pipe 5 is inserted into the length in bearing chamber cavity 6 and is more than between spacer 4 and bearing block 1
Gap, this design can guarantee that enters the compressed air of bearing chamber cavity 6 in the migration of bearing chamber cavity 6 by compressed air ascending pipe 5
After one circle, then to discharge through the gap between spacer 4 and bearing block 1, such compressed air can take away more heats in bearing chamber,
The compressed air of constant flow enhances the heat sinking function of bearing chamber, so as to reduce the temperature of bearing 2, improves the operation of bearing 2
Environment, add the service life of bearing 2.
Above-mentioned compressed air ascending pipe 5 is connected with source of the gas 8, and pressure regulation is sequentially provided between source of the gas 8 and compressed air ascending pipe 5
Valve 9, air cleaner 10 and air dryer 11, pressure regulator valve 9, air cleaner 10 and air dryer 11 are and compressed air
Ascending pipe 5 connects.The compressed air that source of the gas 8 provides controls the pressure of compressed air by pressure regulator valve 9, then passes through air mistake successively
Filter 10 and air dryer 11 are filtered and dried to gas, are cleaned dry compressed air and are injected through the compressed air
Pipe 5 is entered in bearing chamber cavity 6, is most discharged afterwards through the gap between spacer 4 and bearing block 1.It is preferred that compressed air ascending pipe
The pressure of the compressed air of 5 injection bearing room cavitys 6 is 3kPa~5kPa；According to the checking of experiment：If the pressure of compressed air
Less than 3kPa, air flow is slow, causes dust-proof effect poor；If the pressure of compressed air is more than 5kPa, the structure of bearing 2 can be produced
It is raw to influence.The compressed air of cleaning with 3kPa~5kPa relative pressures by the injection bearing room cavity 6 of compressed air ascending pipe 5,
And malleation is formed in bearing chamber cavity 6, due to existing malleation in bearing chamber cavity 6, compressed air is by spacer 4 and bearing block
Flowed out in gap between 1, due to the effect of air-flow, prevent dust, muddy water etc. to enter bearing chamber cavity 6, so as to reach
Dust-proof purpose, avoid bearing 2 lubrication failure and inordinate wear caused by dust and muddy water enter.
Preferably, air pressure detection sensor I 12 is provided with bearing chamber cavity 6, is set in the discharge side of the compressed air of spacer 4
There is air pressure detection sensor II 13.Air pressure detection sensor I 12 detects the air pressure in bearing chamber cavity 6, air pressure detection sensor
The air pressure in the outside of II 13 detection bearing chamber cavity 6, is detected according to air pressure detection sensor I 12 and air pressure detection sensor II 13
Numerical value, the atmospheric pressure value that the air pressure detection sensor I 12 that regulation pressure regulator valve 9 makes detects are more than the gas that air pressure detection sensor II 13 detects
Pressure value, to ensure in bearing chamber cavity 6 as malleation, compressed air always is to flow out out of bearing chamber cavity 6, avoids extreme bar
Occur back flow of gas phenomenon under part, dustproof effect can not be played if there is backflow phenomena.
The present invention has the advantages that cost is low, is easily achieved, and can be widely applied to operation in the wild, mine, more rainwater etc.
The bearing dustproof and waterproof to be worked under environment.The bearing positive pressure dust-proof structure is actively blown off dust using barotropic gas, is thoroughly avoided
Dust enters bearing chamber, improves bearing service life and reliability.
The present invention is exemplarily described above in conjunction with accompanying drawing, it is clear that present invention specific implementation is not by aforesaid way
Limitation, as long as employ technical solution of the present invention progress various unsubstantialities improvement, or it is not improved by the present invention
Inventive concept and technical scheme directly apply to other occasions, within protection scope of the present invention.
Claims (10)
1. a kind of bearing positive pressure dust-proof structure, including bearing block (1), bearing (2) and axle (3), it is characterised in that：The bearing is just
Pressure dustproof construction also includes spacer (4), and the spacer (4) is fixedly sleeved on the axle (3), the spacer (4) and the axle
Hold and bearing chamber cavity (6) is formed between (2), the hole (7) being adapted to compressed air ascending pipe (5) is provided with the bearing block (1).
A kind of 2. bearing positive pressure dust-proof structure as claimed in claim 1, it is characterised in that：The spacer (4) and the axle (3)
For interference fit, the spacer (4) coordinates with the bearing block (1) for gap.
A kind of 3. bearing positive pressure dust-proof structure as claimed in claim 2, it is characterised in that：The spacer (4) and the bearing
Gap width between seat (1) is 0.8mm~0.12mm.
A kind of 4. bearing positive pressure dust-proof structure as described in claims 1 to 3 any one, it is characterised in that：The compression is empty
Gas ascending pipe (5) connects with the bearing chamber cavity (6), and compressed air enters described through the compressed air ascending pipe (5)
In bearing chamber cavity (6), then it is discharged to through the gap between the spacer (4) and the bearing block (1) in air.
A kind of 5. bearing positive pressure dust-proof structure as claimed in claim 4, it is characterised in that：The compressed air ascending pipe (5)
The length being inserted into the bearing chamber cavity (6) is more than the gap between the spacer (4) and the bearing block (1).
A kind of 6. bearing positive pressure dust-proof structure as claimed in claim 4, it is characterised in that：The compressed air ascending pipe (5)
The pressure for injecting the air of the bearing chamber cavity (6) is 3kPa~5kPa.
A kind of 7. bearing positive pressure dust-proof structure as claimed in claim 1, it is characterised in that：The compressed air ascending pipe (5)
It is connected with source of the gas (8), pressure regulator valve (9), air mistake is sequentially provided between the source of the gas (8) and the compressed air ascending pipe (5)
Filter (10) and air dryer (11), the pressure regulator valve (9), air cleaner (10) and air dryer (11) with it is described
Compressed air ascending pipe (5) connects.
A kind of 8. bearing positive pressure dust-proof structure as claimed in claim 7, it is characterised in that：The compression that the source of the gas (8) provides
Pressure of the air by the pressure regulator valve (9) control compressed air, then pass through the air cleaner (10) and the sky successively
Gas dryer (11) is filtered and dried to gas, and the compressed air that finally clean is dried is through the compressed air ascending pipe
(5) bearing chamber cavity (6) is arrived described in entering.
A kind of 9. bearing positive pressure dust-proof structure as claimed in claim 1, it is characterised in that：In the bearing chamber cavity (6)
Provided with air pressure detection sensor I (12), air pressure detection sensor II is provided with the discharge side of the spacer (4) compressed air
(13)。
A kind of 10. bearing positive pressure dust-proof structure as described in claim 7 to 9 any one, it is characterised in that：The air pressure inspection
The air pressure surveyed in sensor I (12) the detection bearing chamber cavity (6), the air pressure detection sensor II (13) detect the axle
The air pressure on the outside of room cavity (6) is held, the number detected according to air pressure detection sensor I (12) and air pressure detection sensor II (13)
Value, adjust the pressure regulator valve (9) and ensure that the atmospheric pressure value of air pressure detection sensor I (12) detection is more than air pressure detection and passed
The atmospheric pressure value of sensor II (13) detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711306690.3A CN107830176B (en) | 2017-12-11 | 2017-12-11 | Bearing positive pressure dustproof structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711306690.3A CN107830176B (en) | 2017-12-11 | 2017-12-11 | Bearing positive pressure dustproof structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107830176A true CN107830176A (en) | 2018-03-23 |
| CN107830176B CN107830176B (en) | 2024-05-28 |
Family
ID=61642398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711306690.3A Active CN107830176B (en) | 2017-12-11 | 2017-12-11 | Bearing positive pressure dustproof structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107830176B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110032162A (en) * | 2018-04-18 | 2019-07-19 | 沈阳铝镁设计研究院有限公司 | A kind of DCS/PLC control cabinet and its application method with positive pressure |
| CN111044425A (en) * | 2020-01-10 | 2020-04-21 | 常熟市易安达电器有限公司 | Dust sensor with low failure rate |
| CN111912390A (en) * | 2020-08-31 | 2020-11-10 | 重庆工程职业技术学院 | Protection type inclinometer |
| CN114007722A (en) * | 2019-04-08 | 2022-02-01 | 热科控股有限公司 | Fluidized bed reactor arrangement and method for treating organic material using a fluidized bed reactor arrangement |
| CN114483797A (en) * | 2022-02-14 | 2022-05-13 | 西北工业大学 | Bearing sealing method in high-pollution environment |
| CN118088582A (en) * | 2024-04-12 | 2024-05-28 | 浙江得利亚自动化制造有限公司 | Ball bearing assembly and ball |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1182756A (en) * | 1997-09-05 | 1999-03-26 | Nippon Seiko Kk | Bearing device |
| CN201487215U (en) * | 2009-09-11 | 2010-05-26 | 天津市中环天佳电子有限公司 | Shaft seal device of high-speed powder mixer |
| CN102383605A (en) * | 2011-11-24 | 2012-03-21 | 三一重工股份有限公司 | Lubrication system of concrete machine and concrete machine |
| CN204301476U (en) * | 2014-11-28 | 2015-04-29 | 华润水泥技术研发有限公司 | A kind of supporting roller of rotary kiln bearing assembly |
| CN207687354U (en) * | 2017-12-11 | 2018-08-03 | 玉柴联合动力股份有限公司 | A kind of bearing positive pressure dust-proof structure |
-
2017
- 2017-12-11 CN CN201711306690.3A patent/CN107830176B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1182756A (en) * | 1997-09-05 | 1999-03-26 | Nippon Seiko Kk | Bearing device |
| CN201487215U (en) * | 2009-09-11 | 2010-05-26 | 天津市中环天佳电子有限公司 | Shaft seal device of high-speed powder mixer |
| CN102383605A (en) * | 2011-11-24 | 2012-03-21 | 三一重工股份有限公司 | Lubrication system of concrete machine and concrete machine |
| CN204301476U (en) * | 2014-11-28 | 2015-04-29 | 华润水泥技术研发有限公司 | A kind of supporting roller of rotary kiln bearing assembly |
| CN207687354U (en) * | 2017-12-11 | 2018-08-03 | 玉柴联合动力股份有限公司 | A kind of bearing positive pressure dust-proof structure |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110032162A (en) * | 2018-04-18 | 2019-07-19 | 沈阳铝镁设计研究院有限公司 | A kind of DCS/PLC control cabinet and its application method with positive pressure |
| CN114007722A (en) * | 2019-04-08 | 2022-02-01 | 热科控股有限公司 | Fluidized bed reactor arrangement and method for treating organic material using a fluidized bed reactor arrangement |
| CN111044425A (en) * | 2020-01-10 | 2020-04-21 | 常熟市易安达电器有限公司 | Dust sensor with low failure rate |
| CN111912390A (en) * | 2020-08-31 | 2020-11-10 | 重庆工程职业技术学院 | Protection type inclinometer |
| CN114483797A (en) * | 2022-02-14 | 2022-05-13 | 西北工业大学 | Bearing sealing method in high-pollution environment |
| CN114483797B (en) * | 2022-02-14 | 2023-10-31 | 西北工业大学 | Bearing sealing method under high pollution environment |
| CN118088582A (en) * | 2024-04-12 | 2024-05-28 | 浙江得利亚自动化制造有限公司 | Ball bearing assembly and ball |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107830176B (en) | 2024-05-28 |
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