CN216801688U - Vacuum oil immersion device for lubricating powder metallurgy bearing - Google Patents
Vacuum oil immersion device for lubricating powder metallurgy bearing Download PDFInfo
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- CN216801688U CN216801688U CN202220471270.0U CN202220471270U CN216801688U CN 216801688 U CN216801688 U CN 216801688U CN 202220471270 U CN202220471270 U CN 202220471270U CN 216801688 U CN216801688 U CN 216801688U
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Abstract
A vacuum oil immersion device for lubricating a powder metallurgy bearing comprises: the rotary oil immersion inner chamber is arranged in the outer container, and an ultrasonic medium is filled between the rotary oil immersion inner chamber and the outer container; the rotary oil immersion inner chamber comprises a rotary frame and an inner container, wherein the inner container is used for containing lubricating oil and a bearing, and the rotary frame is used for enabling the lubricating oil to be in a turbulent flow state; an ultrasonic generator which emits ultrasonic waves to act on the lubricating oil through the ultrasonic medium and the inner container; a sealing cover which is hermetically arranged at the opening position of the outer container and enables the inner cavity of the outer container to be in a sealing state; and the vacuumizing pipeline is used for vacuumizing the inner cavities of the outer container and the inner container. This device can be under the triple joint condition of rotatory stirring, negative pressure environment and ultrasonic wave, realizes taking away the inside exhaust air of bearing fast with each composition intensive mixing of lubricating oil for oily efficiency of soaking, when oily, lubricating oil can be the turbulent flow state, and with the abundant contact of bearing and collision, can further promote the oil content of bearing.
Description
Technical Field
The utility model relates to the technical field of bearing processing, in particular to a vacuum oil immersion device for lubricating a powder metallurgy bearing and a production method and application thereof.
Background
The powder metallurgy bearing is one of the most commonly used bearings of the motor, and is prepared by the processes of mixing, pressing, sintering, shaping, oil immersion and the like of metal powder. The bearing generally adopts alloying or volatilization, has a porous structure characteristic, can realize the storage function of lubricating oil, realizes the release of the lubricating oil under the comprehensive conditions of negative pressure, heat effect and the like generated by the rotating work of the motor to obtain a lubricating oil film, and sucks the lubricating oil back under the capillary action of the oil hole when the motor stops working, thereby having the advantages of simple structure, high cost performance and the like.
The powder metallurgy bearing carries out pore forming through the alloyed volume difference or the addition of volatile components, and the pores can effectively permeate lubricating oil into micropores of the bearing only by a vacuum-assisted method due to the reasons of small pore diameter, high length-diameter ratio and the like. Currently, in the industrial oil immersion process, lubricating oil is generally poured into a container, then the container is placed into a powder metallurgy bearing, finally the container is sealed, a mechanical vacuum pump is used for pumping the container to a vacuum degree below-80 KPa and heating is carried out for 30 minutes, and finally the oil immersion process of the bearing is completed.
However, the current commercial conventional powder metallurgy oil foaming process uses static foam in a single type of homogeneous lubricant due to the influence of the conditions of vacuum pumping and pressure maintaining. With the upgrade of the motor industry, higher and higher requirements are put forward on performance indexes of low-temperature noise, vibration and the like of the motor, the single type of lubricating oil is difficult to meet the new requirements, and the types of mixed type lubricating oil added with the nano molybdenum disulfide solid lubricant or other liquid modifiers and the like are more and more. For the metastable mixed lubricating oil with the separation tendency, the current lubricating oil soaking system has the defects of poor stability and high failure risk of products because the lubricating oil soaked by powder metallurgy parts in different areas is different. Therefore, it is difficult for the current oil soak systems to meet the requirements of new hybrid type lubricating oils.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides a vacuum oil immersion device for lubricating a powder metallurgy bearing.
In order to achieve the purpose, the utility model adopts the following technical measures:
a vacuum oil immersion device for lubricating a powder metallurgy bearing comprises:
the rotary oil immersion inner chamber is arranged in the outer container, and an ultrasonic medium is filled between the rotary oil immersion inner chamber and the outer container;
the rotary oil immersion inner chamber comprises a rotary frame and an inner container, wherein the inner container is used for containing lubricating oil and a bearing, and the rotary frame is used for enabling the lubricating oil to be in a turbulent flow state;
an ultrasonic generator which emits ultrasonic waves to act on the lubricating oil through the ultrasonic medium and the inner container;
a sealing cover which is hermetically arranged at the opening position of the outer container and enables the inner cavity of the outer container to be in a sealing state;
and the vacuumizing pipeline is used for vacuumizing the inner cavities of the outer container and the inner container.
Furthermore, the rotating frame is connected with the inner container, and the inner container is driven to rotate through the rotation of the rotating frame.
Further, the inner container bottom is installed in the outer container through spacing connecting piece, spacing connecting piece includes bearing mount pad, bearing housing, jump ring and pivot, bearing mount pad fixed mounting in outer container bottom, bearing housing install on the bearing mount pad, install on the bearing housing with pivot complex recess, the jump ring contradicts the recess below, pivot one end fixed connection the inner container outside bottom, the pivot other end is installed in the recess.
Furthermore, a cushion block is arranged at the bottom of the outer container, and an inclined cushion surface for enabling the rotary oil immersion inner chamber and/or the outer container to incline is arranged on the cushion block.
Further, the outer container is arranged obliquely, and the inclination angle is 25-55 degrees.
Further, the inner wall of the inner container is rough, and the roughness Ra is 0.8-1.6.
Further, the inner wall of the inner container is rough, and the roughness Ra is 0.8-1.6.
Furthermore, the swivel mount is installed sealed bottom of the cover, the swivel mount includes link and slewing mechanism, slewing mechanism is including installing sealed epaxial fixed axle of covering, install on the fixed axle and lead electrical slip ring, the link is installed lead electrical slip ring's outer rotor.
Furthermore, the outer side wall of the inner container is annularly provided with at least two clamping protrusions, the connecting frame is provided with connecting claws which are connected with the inner container in a matched mode, and the connecting claws are provided with clamping grooves which are tightly matched with the clamping protrusions.
Furthermore, the front surface of the inclined cushion surface of the cushion block is provided with a mounting seat matched with the inner container, and the back surface of the inclined cushion surface is connected with a supporting piece for adjusting the angle of the inclined cushion surface.
The utility model has the beneficial effects that:
the vacuum oil immersion device for lubricating the powder metallurgy bearing can provide a negative pressure environment for a bearing oil immersion process, meanwhile, the device is provided with the ultrasonic generator, under the triple combination condition of rotary stirring, the negative pressure environment and ultrasonic waves, the components of lubricating oil can be fully stirred, air exhausted from the interior of the bearing can be quickly taken away, the oil immersion efficiency is accelerated, the lubricating oil can be in a turbulent flow state and fully contacts and collides with the bearing when the lubricating oil is immersed in oil, the oil content of the bearing can be further improved, and the service life of the bearing is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of a vacuum oil immersion device for lubricating a powder metallurgy bearing according to the present invention;
fig. 2 is a schematic structural diagram of embodiment 2 of a vacuum oil immersion device for lubricating a powder metallurgy bearing according to the utility model;
FIG. 3 is a top view of a rotating frame according to embodiment 2 of the vacuum oil immersion device for lubricating a powder metallurgy bearing of the present invention;
FIG. 4 is a schematic structural diagram of an outer container in example 2 of a vacuum oil immersion device for lubricating a powder metallurgy bearing according to the present invention;
fig. 5 is a schematic structural diagram of an inner container in embodiment 2 of the vacuum oil immersion device for lubricating a powder metallurgy bearing according to the present invention;
fig. 6 is a schematic structural view of embodiment 3 of the vacuum oil immersion device for lubricating a powder metallurgy bearing of the utility model;
fig. 7 is a schematic structural view of embodiment 4 of the vacuum oil immersion device for lubricating a powder metallurgy bearing of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection, electrical connection and communication connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1, a powder metallurgy bearing lubricating vacuum oil immersion device, including outer container 1, install rotatory oily inner chamber 2 of soaking in outer container 1, rotatory oily inner chamber 2 of soaking includes swivel mount 21 and inner container 22, inner container 22 is used for holding lubricating oil and bearing, swivel mount 21 is used for making lubricating oil be the turbulent flow state to make each composition of lubricating oil more even, fully contact with the bearing, lubricating oil under the turbulent flow state can make the inside and outside pressure differential that forms of bearing hole moreover, be favorable to dragging the air in the hole out, promote the oil content of inner container 22 inner bearing.
An ultrasonic medium is filled between the rotary oil immersion inner chamber 2 and the outer container 1, the ultrasonic generators 3 are mounted on two sides of the outer container 1, ultrasonic waves emitted by the ultrasonic generators 3 penetrate through the ultrasonic medium and the inner container 22 to act on the lubricating oil, so that violent impact can be generated between liquid particles of the lubricating oil, the turbulent flow state of the lubricating oil is enhanced, and the lubricating oil can not splash.
The outer container 1 with inner container 22 communicates, the opening position of outer container 1 installs sealed lid 4, sealed lid 4 with outer container 1 can select detachable connections such as interference fit, threaded connection, buckle connection, bolted connection, does not do specifically and restricts, sealed lid 4 is used for making outer container 1 inner chamber is in encapsulated situation, still is connected with evacuation pipeline 5 on sealed lid 4, evacuation pipeline 5 is connected with the vacuum pump, evacuation pipeline 5 is used for to the outer container 1, the inner chamber of inner container 22 carry out the evacuation. And under the vacuum environment, the gas in the bearing is favorably exhausted.
The ultrasonic medium is preferably silicone oil which has excellent thermal oxidation stability, small evaporation pressure and difficult evaporation and can avoid the pollution to the lubricating oil under the vacuum condition.
In this embodiment, the rotating frame 21 is installed below the sealing cover 4, the rotating frame 21 is connected with a motor for driving the rotating frame 21 to rotate, and the rotating frame 21 extends into the inner container 22 for stirring the lubricating oil in the inner container 22 to form a turbulent flow state.
More specifically, in the present embodiment, the outer container 1 and the inner container 22 are both stainless steel containers, and in other embodiments, the outer container 1 and the inner container 2 may be other metal containers, glass containers, wood containers, ceramic containers, plastic containers, or the like.
The inner container 22 may be fixedly mounted within the outer container 1. In some embodiments, an electric turntable may also be provided on the outer container 1, and the inner container 22 may be mounted on the electric turntable, so that the inner container 22 may rotate relative to the outer container 1, which is beneficial to quickly take away air exhausted from the bearing, and thus, the bearing oil immersion efficiency is accelerated.
Example 2
As shown in fig. 2-5, a vacuum oil immersion device for lubricating a powder metallurgy bearing comprises an outer container 1, a rotary oil immersion inner chamber 2, an ultrasonic generator 3, a sealing cover 4 and an evacuation pipeline 5, wherein the rotary oil immersion inner chamber 2 comprises a rotary frame 21 and an inner container 22, the inner container 22 is used for containing lubricating oil and a bearing, the rotary frame 21 is used for connecting the inner container 22, and the rotary frame 21 drives the inner container 22 to rotate, so that the lubricating oil in the inner container 22 is in a turbulent flow state.
The ultrasonic medium filled between the rotary oil immersion inner chamber 2 and the outer container 1 is silicone oil, the ultrasonic generators 3 are mounted on two sides of the outer container 1, and ultrasonic waves emitted by the ultrasonic generators 3 penetrate through the ultrasonic medium and the inner container 22 to act on the lubricating oil.
The outer container 1 and the inner container 22 both adopt cylindrical barrel-shaped structures, a butyl rubber sealing ring is arranged at the opening position of the outer container 1, a bolt seat is annularly arranged on the outer side wall of the outer container 1, the sealing cover 4 covers the opening position of the outer container 1 and is connected with the bolt seat through a bolt, the sealing cover 4 is locked at the opening position of the outer container 1, and the inner cavity of the outer container 1 is in a sealing state. The sealing cover 4 is also connected with a vacuum pumping pipeline 5, the vacuum pumping pipeline 5 is connected with a vacuum pump, and the vacuum pumping pipeline 5 is used for vacuumizing the inner cavities of the outer container 1 and the inner container 22.
The present embodiment is different from embodiment 1 in that the rotating frame 21 is connected to the inner container 22, and the inner container 22 is rotated by the rotation of the rotating frame 21. In detail, the rotating frame 21 is installed below the sealing cover 11, the rotating frame 21 includes a connecting frame 211 and a rotating mechanism 212, the rotating mechanism 212 includes a fixed shaft 2121 installed on the sealing cover, a conductive sliding ring 2122 is installed on the fixed shaft 2121, the connecting frame 211 is installed on an outer rotor of the conductive sliding ring 2122, and the connecting frame 211 can be driven to rotate by the conductive sliding ring 2122. The outer side wall of the inner container 22 is annularly provided with at least two clamping protrusions 221, the connecting frame 211 is provided with an elastic connecting claw which is connected with the inner container 22 in a matched mode, the elastic connecting claw is in interference fit with the inner container 22, and the elastic connecting claw is provided with a clamping groove which is tightly matched with the clamping protrusions 221. The rotating mechanism 212 can rotate the connecting frame 211, so as to rotate the inner container 22, so that the lubricant in the inner container 22 forms a turbulent flow pattern. Additionally, in some embodiments, the rotational mechanism 212 may also select a motor rotor.
In order to further improve the rotating smoothness of the inner container 22, the bottom of the inner container 22 is mounted in the outer container 1 through a limiting connector 6, the limiting connector 6 is used for the limiting connector 6 to comprise a bearing mounting seat 61, a bearing sleeve 62, a clamp spring 63, a rotating shaft 64 and a recess 65, the bearing mounting seat 61 is fixedly mounted at the inner bottom of the outer container 1, the bearing sleeve 62 is mounted at a hole position of the bearing mounting seat 61, the recess 65 matched with the rotating shaft 64 is arranged on the bearing sleeve 62, the clamp spring 63 is mounted in the bearing sleeve 62, one end of the rotating shaft 64 is fixedly connected with the outer bottom of the inner container 22, and the other end of the rotating shaft 64 is mounted in the recess. The clamp spring 63 is abutted to the lower part of the concave seat 65 and used for axially limiting the concave seat 65 and preventing the rotating shaft 64 from sinking.
In addition, in the present application, a conductive slip ring 2122 is used as a rotary power source, the fixed shaft 2121 is of a hollow structure, and a conductive wire of the conductive slip ring 2122 extends out of the sealing cover 4 from an inner cavity of the fixed shaft 2121 and is connected to a power supply; the vacuum pumping pipeline 5 extends out of the sealing cover 4 from the inner cavity of the fixed shaft 2121 and is connected with a vacuum pump, so that the hole positions of the sealing cover 4 can be reduced, and the air tightness of the connection between the outer container 1 and the sealing cover 4 is improved.
Example 3
As shown in fig. 6, the present embodiment discloses a vacuum oil immersion device for powder metallurgy bearing lubrication, which is different from embodiment 2 in that: the bottom of the inner cavity of the outer container 1 is provided with a cushion block 7, and the cushion block 7 is provided with an inclined cushion surface which enables the rotary oil immersion inner chamber to be inclined. In detail, the inner container 22 is mounted on an inclined pad surface of the pad block 7 through the limit connector 6, and the pad block 7 may be an independent metal hard block matched with an inner cavity of the outer container 1, or may be an inclined surface integrally formed with the outer container 1. The outer container 1 is opened upwards and vertically arranged, the inner container 22 is obliquely arranged in the inner cavity of the outer container 1, the bottom surface of the inner container 22 is inclined by 25-55 degrees compared with the horizontal line, so that lubricating oil in the inner container 22 can form an oblique liquid level, a bearing in the inner container 22 can be contacted with the side wall of the inner container 22, and the gravity center of the inner container 22 can shift along with the position change of the lubricating oil and the bearing and is not coaxial with the limit connector 6.
When the cushion block 7 is integrally formed with the outer container 1, the inclination of the inner container 22 is not adjustable; when the cushion block 7 is independently arranged in the outer container 1, the angle of the inclined cushion surface can be changed by replacing different cushion blocks 7, so that the inclined angle of the inner container 22 can be changed. The inclination angle of the inner container 22 can be selected from any angle of 25-55 degrees, and can be flexibly selected according to the liquid level height of lubricating oil, the stacking height of bearings and the height of the ultrasonic medium.
When the rotating frame 21 rotates to drive the inner container 22 to rotate, because the bottom surface of the inner container 22 is inclined to the horizontal line, and the side wall of the inner container 22 is in a non-vertical state with the horizontal line under the inclined angle, the rotation generates a remarkable 'turbulent stirring' effect on the lubricating oil in the inner container 22; meanwhile, the bearing is driven by the rotation of the inner container 22 to change the center of gravity and position, and the center of gravity and position of the bearing can be continuously adjusted automatically in the changing process, so that the stirring effect of the lubricating oil and the bearing is further enhanced. Under the working condition that the rotary oil immersion inner chamber 2 continuously rotates, the bearings stacked in batches continuously collide with the inner wall of the inner container 22 and lubricating oil, and the stirring effect is more effective, so that each component in the lubricating oil can achieve a very good mixing effect, separation of air in the bearings can be accelerated, and the oil immersion effect is favorably improved.
In addition, in order to further improve the 'turbulent stirring' effect, the inner wall of the inner container 22 is rough, the roughness Ra is 0.8-1.6, and in the roughness range, a bearing can be in friction contact with the inner wall of the inner container 22 under the rotation of the inner container 22, so that the change of the gravity center and the position of the bearing is facilitated, and the 'stirring' effect of lubricating oil and the bearing is enhanced.
Example 4
As shown in fig. 7, the present embodiment discloses a vacuum oil immersion device for powder metallurgy bearing lubrication, which is different from embodiment 3 in that: the cushion block 7 is arranged at the outer side of the bottom of the outer container 1, and an inclined cushion surface for enabling the outer container 1 to incline is arranged on the cushion block 7. The inner container 22 is parallel to the outer container 1, the bottom surfaces of the outer container 1 and the inner container 22 are inclined 25-55 degrees relative to the horizontal line, so that lubricating oil in the inner container 22 and ultrasonic medium in the outer container 1 can form an inclined liquid level, a bearing in the inner container 22 can be contacted with the side wall of the inner container 22, and the gravity center of the inner container 22 can be shifted along with the position change of the lubricating oil and the bearing. The liquid level height of the ultrasonic medium is higher than that of the lubricating oil.
The cushion blocks 7 can be blocky solids with fixed angles of inclined cushion surfaces such as metal blocks, concrete blocks, stone blocks, rubber blocks and the like, the inclined cushion surfaces are inclined by 25-55 degrees compared with the horizontal line, and the cushion blocks 7 with different inclinations can be replaced according to requirements so as to meet the requirement of enhancing the turbulent stirring effect between lubricating oil and the bearing. Furthermore, in some embodiments, the inclined mat surface may be provided with a clamping seat for fixing the outer container 1.
In summary, the vacuum oil immersion device for lubricating the powder metallurgy bearing disclosed by the utility model can provide a negative pressure environment for a bearing oil immersion process, meanwhile, the device is provided with the ultrasonic generator, under the triple combination condition of rotary stirring, the negative pressure environment and ultrasonic waves, the components of lubricating oil can be fully stirred, air discharged from the interior of the bearing can be quickly taken away, the oil immersion efficiency is accelerated, the lubricating oil can be in a turbulent flow state when immersed in oil and fully contacts and collides with the bearing, the oil content of the bearing can be further improved, and the service life of the bearing is favorably prolonged.
The foregoing is a further detailed description of the utility model in connection with specific preferred embodiments and it is not intended to limit the utility model to the specific embodiments described. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.
Claims (10)
1. A vacuum oil immersion device for lubricating a powder metallurgy bearing is characterized by comprising:
the rotary oil immersion inner chamber is arranged in the outer container, and an ultrasonic medium is filled between the rotary oil immersion inner chamber and the outer container;
the rotary oil immersion inner chamber comprises a rotary frame and an inner container, wherein the inner container is used for containing lubricating oil and a bearing, and the rotary frame is used for enabling the lubricating oil to be in a turbulent flow state;
an ultrasonic generator which emits ultrasonic waves to act on the lubricating oil through the ultrasonic medium and the inner container;
a sealing cover which is hermetically arranged at the opening position of the outer container and enables the inner cavity of the outer container to be in a sealing state;
and the vacuumizing pipeline is used for vacuumizing the inner cavities of the outer container and the inner container.
2. The vacuum oil immersion device for powder metallurgy bearing lubrication according to claim 1, wherein the rotating frame is connected with the inner container, and the inner container is driven to rotate through rotation of the rotating frame.
3. The vacuum oil immersion device for powder metallurgy bearing lubrication according to claim 1, wherein the bottom of the inner container is mounted in the outer container through a limiting connector, the limiting connector comprises a bearing mounting seat, a bearing sleeve, a clamp spring and a rotating shaft, the bearing mounting seat is fixedly mounted at the bottom of the outer container, the bearing sleeve is mounted on the bearing mounting seat, a recess matched with the rotating shaft is mounted on the bearing sleeve, the clamp spring abuts against the lower portion of the recess, one end of the rotating shaft is fixedly connected with the bottom of the outer side of the inner container, and the other end of the rotating shaft is mounted in the recess.
4. The vacuum oil immersion device for powder metallurgy bearing lubrication according to claim 1, wherein a cushion block is arranged at the bottom of the outer container, and an inclined cushion surface is arranged on the cushion block and enables the rotating oil immersion inner chamber and/or the outer container to be inclined.
5. The vacuum oil immersion device for powder metallurgy bearing lubrication according to claim 1, wherein the outer container is arranged obliquely at an angle of 25 ° to 55 °.
6. The vacuum oil immersion device for lubricating the powder metallurgy bearing according to claim 1, wherein the rotating oil immersion inner chamber is arranged in an inclined mode, and the inclined angle is 25-55 degrees.
7. A vacuum oil immersion device for powder metallurgy bearing lubrication according to any one of claims 4 to 6, wherein the inner wall of the inner container is rough, and the roughness Ra is 0.8 to 1.6.
8. The vacuum oil immersion device for powder metallurgy bearing lubrication according to claim 1, wherein the rotating frame is installed at the bottom of the sealing cover, the rotating frame comprises a connecting frame and a rotating mechanism, the rotating mechanism comprises a fixed shaft installed on the sealing cover, a conductive sliding ring is installed on the fixed shaft, and the connecting frame is installed on an outer rotor of the conductive sliding ring.
9. The vacuum oil immersion device for lubricating the powder metallurgy bearing according to claim 8 is characterized in that at least two clamping protrusions are arranged on the outer side wall of the inner container in a surrounding mode, an elastic connection claw which is connected with the inner container in a matched mode is arranged on the connecting frame, the elastic connection claw is in interference fit with the inner container, and a clamping groove which is tightly matched with the clamping protrusions is formed in the elastic connection claw.
10. The vacuum oil immersion device for powder metallurgy bearing lubrication according to claim 4, wherein the front face of the inclined pad face of the cushion block is provided with a mounting seat matched with the inner container, and the back face of the inclined pad face is connected with a support member for adjusting the angle of the inclined pad face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220471270.0U CN216801688U (en) | 2022-03-03 | 2022-03-03 | Vacuum oil immersion device for lubricating powder metallurgy bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220471270.0U CN216801688U (en) | 2022-03-03 | 2022-03-03 | Vacuum oil immersion device for lubricating powder metallurgy bearing |
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| CN216801688U true CN216801688U (en) | 2022-06-24 |
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| CN202220471270.0U Active CN216801688U (en) | 2022-03-03 | 2022-03-03 | Vacuum oil immersion device for lubricating powder metallurgy bearing |
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| CN (1) | CN216801688U (en) |
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