A sensitive plastic oil bearing and a limited amount and position filling method thereof

Abstract

A sensitive plastic oil bearing and a limited amount and position filling method thereof, wherein the plastic oil is dispersed and uniformly filled only in the gaps between the rolling elements in the bearing in a molten state or a non-molten state, and the solidified plastic oil is dispersed in the form of irregular block units, the number of units is equal to the number of rolling elements, and each unit is wrapped around a retaining frame but does not directly contact the rolling elements. When the bearing is running, since the rolling elements are not in direct contact with the plastic oil, there is no need to overcome the contact friction between the rolling elements and the plastic oil, so the flexibility and speed factor of the bearing are fundamentally improved compared with the fully filled plastic oil bearing of the existing technology, and the oil output of the plastic oil is fundamentally reduced compared with the fully filled plastic oil bearing of the existing technology, and thus the risk of oil leakage of the bearing is fundamentally reduced. The sensitive plastic oil bearing of the present invention, while inheriting the advantages of plastic oil lubrication, overcomes the disadvantages of the fully filled plastic oil bearing of the existing technology, that is, the sensitivity and speed factor are low and the oil leakage is easy, greatly expands the application range of the plastic oil bearing, and has very important engineering practical significance.

Description

Technical Field

[0001] The invention relates to the technical field of special rolling bearings, and in particular to a sensitive plastic oil bearing and a limited quantity and position filling method thereof. Background Art

[0002] Plastic oil is the third type of fluid lubricating material or fluid lubricant after lubricating oil and grease. Unlike the base oil in grease which is retained by a thickener, the lubricating oil in plastic oil is retained by a microporous polymer. It is called plastic oil because it looks like plastic to the naked eye.

[0003] In the current plastic oil lubricated bearings (referred to as plastic oil bearings), the plastic oil fills the inner cavity of the bearing as much as possible to prevent dust, prevent the formation of condensed water, and increase the lubrication life of the bearing. However, the current plastic oil bearings also have some obvious limitations. For example, compared with the corresponding grease lubricated bearings, the bearing operation is not sensitive enough, the bearing speed factor is low, and the oil output is large and prone to oil leakage. These limitations have greatly limited the application scope of plastic oil bearings. After analysis, these limitations are all caused by full filling. It is necessary to develop sensitive plastic oil bearings to meet the strict requirements of engineering practice for plastic oil bearings to be flexible in operation, high in speed, and not leaking. After successful development, it will greatly expand the application scope of plastic oil bearings, so it has very important engineering practical significance. Summary of the invention

[0004] The first purpose of the present invention is to provide a sensitive plastic oil bearing to solve the shortcomings of the prior art fully filled plastic oil bearings, such as large friction torque, low speed factor and easy oil leakage, so as to broaden the application scope of plastic oil lubricated bearings.

[0005] The second purpose of the present invention is to provide a method for limited quantity and position filling of sensitive plastic oil bearings to solve the defect that the plastic oil bearings produced by the prior art all fully fill the free space inside the bearings and fail to meet the application requirements of certain special working conditions.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A sensitive plastic oil bearing comprises an outer ring, an inner ring, rolling elements embedded between the outer ring raceway and the inner ring raceway, a retaining frame, and plastic oil of a porous oil-containing lubricating material that provides lubrication for each contact friction pair of the bearing. The plastic oil is characterized in that the plastic oil is only filled in the discrete free space between the rolling elements in the bearing, and all surfaces of the rolling elements are not filled with or coated with the plastic oil. When the bearing is running, an assembly formed by the three types of elements, the rolling elements, the retaining frame and the plastic oil, revolves together. Under the action of centrifugal force and contact friction with the ring raceway, the lubricating oil in the plastic oil escapes from the micropores, and lubricates the ring raceway surface and the retaining frame surface that are in direct contact with the plastic oil at the first time. The rolling elements are quickly lubricated due to contact with the ring raceway surface. Compared with the fully filled plastic oil bearing of the existing technology, the contact and friction parts between the plastic oil and other elements in the bearing are greatly reduced, so that the rotation flexibility and speed factor of the bearing are greatly improved, and the plastic oil output and the risk of bearing oil leakage are greatly reduced.

[0008] In the sensitive plastic oil bearing as described above, the molded plastic oil exists between the rolling elements in the bearing in the form of a number of irregular block-type units that are not connected to each other. The number of plastic oil block-type units is equal to the number of rolling elements in the bearing. Each unit passes through both sides of the cage and wraps around the cage. The units are evenly separated along the circumference of the bearing by the rolling elements and the cage pockets or window holes.

[0009] The plastic oil includes a polymer matrix, lubricating oil, fatty acid salt and solid lubricant, with weight proportions of 25-45%, 45-75%, 0.1-1.5% and 0-1% respectively. After solidification and molding in the bearing, each plastic oil block-type unit presents a porous oil-containing plastic state, with a micropore diameter of 1 micron to 10 microns, and each micropore is interconnected in a matrix.

[0010] The polymer substrate is polyethylene or ultra-high molecular weight polyethylene; the lubricating oil in the plastic oil is industrial-grade lubricating oil or food-grade lubricating oil; the fatty acid salt is stearate; and the solid lubricant is graphite or molybdenum disulfide or polytetrafluoroethylene.

[0011] A limited amount and position filling method for a sensitive plastic oil bearing, wherein the total amount of plastic oil filled is only 25% to 85% of the full filling amount, and the plastic oil is dispersed and evenly filled into the gap between every two rolling elements at a certain distance from the rolling elements.

[0012] The method includes:

[0013] The plastic oil is injected into the preheated bearing in an unmelted state, heated and melted in situ at the injection position, and then cooled and solidified. The solidified plastic oil block-shaped unit does not directly contact the surface of the rolling element.

[0014] The method further includes:

[0015] The plastic oil is injected in a pre-molten state, then cooled and solidified into a shape. The solidified plastic oil block-type unit does not directly contact the surface of the rolling element.

[0016] The above two methods both involve filling plastic oil from one side or both sides of the bearing.

[0017] The sensitive plastic oil bearing described above is not the same as the commonly known instrument sensitive bearing. Compared with the same bearing fully filled with plastic oil, the starting and running friction torque of the plastic oil bearing of the present invention is significantly reduced, so it is called a sensitive plastic oil bearing.

[0018] The sensitive plastic oil bearings as described above include rolling bearings of various types and sizes, such as deep groove ball bearings, outer spherical ball bearings with seats, cylindrical roller bearings, tapered roller bearings, spherical roller bearings, needle roller bearings, etc.; including open bearings, single-sided sealed bearings and double-sided sealed bearings; including steel balls, steel rollers, ceramic balls, ceramic roller bearings; including metal cage bearings and non-metal cage bearings, etc.; including standard bearings and non-standard bearings.

[0019] Compared with the prior art, the plastic oil is dispersed and evenly injected into the gaps between the rolling elements in the bearing in a molten or non-molten state, and the solidified plastic oil is dispersed in the form of irregular block units (such as Figure 3 As shown in the figure, the number of units is equal to the number of rolling elements. Each unit is wrapped around the retaining frame but is not in direct contact with the rolling elements. When the bearing is running, since the rolling elements are not in direct contact with the plastic oil, there is no need to overcome the contact friction between the rolling elements and the plastic oil. Therefore, the flexibility and speed factor of the bearing are fundamentally improved compared with the fully filled plastic oil bearings of the existing technology, while the plastic oil output is fundamentally reduced compared with the fully filled plastic oil bearings of the existing technology, and thus the risk of oil leakage of the bearing is fundamentally reduced. The sensitive plastic oil bearing of the present invention, while inheriting the advantages of plastic oil lubrication, overcomes the disadvantages of the fully filled plastic oil bearings of the existing technology, which have low sensitivity and speed factor and are prone to oil leakage, greatly expands the application range of plastic oil bearings, and has very important engineering practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Cross-sectional and side views of a current technology fully filled with plastic oil deep groove ball bearing;

[0021] Figure 2 A cross-sectional view and a side view of the sensitive plastic oil deep groove ball bearing of the present invention;

[0022] Figure 3 This is an example diagram of a certain type of bearing with sensitive plastic oil;

[0023] Figure 4 This is a schematic diagram of the principle structure of filling a certain type of bearing with sensitive plastic oil.

[0024] Considering that the seal will block the internal plastic oil, it is not convenient for drawing and observation, so the attached Figure 1 and attached Figure 2 The dust cover is only provided on one side (right side) of the bearing. The present invention is also applicable to seals of various arrangements or materials. DETAILED DESCRIPTION

[0025] Let me first briefly describe the creative process.

[0026] In the prior art, all free spaces in the bearing are filled with plastic oil. The reasons are: (1) The amount of conventional grease lubrication is only 1 / 3 of the free space of the bearing, and full filling of plastic oil means that the lubrication life is extended several times; (2) Full filling of plastic oil can also play a role in self-dust prevention. (3) The free space of the bearing is fully filled with plastic oil, so that there is almost no air in the free space of the bearing, and condensation water formed due to temperature difference will no longer exist. (4) The plastic oil wraps the ball and has a forced lubrication effect, which can cope with working conditions that grease-lubricated bearings are basically or even completely unable to cope with: reciprocating swing, forward and reverse rotation, vibration and impact, etc. Therefore, full filling of plastic oil is the default processing state.

[0027] If you cut open a bearing filled with plastic oil, you will find that except for the tiny or narrow area near the contact point or contact line between the rolling element and the inner ring raceway and the outer ring raceway, the rolling element is almost completely wrapped by the plastic oil, and even the surface of the rolling element wrapped and guided by the cage pocket or window hole is no exception. In other words, the plastic oil is in contact with the surface of the rolling element, the cage surface, and the raceway surface of the ferrule in the bearing, and there is even plastic oil in the narrow gap between the rolling element and the cage pocket or window hole, which leads to excessive contact friction area of ​​the plastic oil, and naturally excessive contact friction. When the bearing is running, the oil output is naturally too large, which leads to a decrease in its operating sensitivity, a decrease in the bearing speed factor, and easy oil leakage compared to grease-lubricated bearings. However, for many main machine working conditions, oil lubrication or grease lubrication is not suitable, and plastic oil lubrication is the most appropriate, but the bearing must be flexible, must be able to work normally at a higher speed, and must not leak oil.

[0028] How to meet the stringent requirements of engineering practice for plastic oil bearings to be flexible, have a high operating speed and be free of oil leakage has become a difficult problem in the industry. Specific embodiments

[0030] like Figure 1 As shown, the fully filled plastic oil deep groove ball bearing comprises an outer ring 11, an inner ring 12, balls 13 embedded between the outer ring raceway and the inner ring raceway, a cage 14 that evenly separates the balls along the circumferential direction of the bearing, porous oil-containing lubricating material plastic oil 15 that provides lubrication for the contact friction pairs of the bearing, and a dust cover 16. Figure 1It can be seen that the plastic oil 15 fully fills the free space inside the bearing. For the ball 13, except for the tiny area in contact with the inner ring raceway and the outer ring raceway, the rest of the surface is completely wrapped by the plastic oil 15, even the surface of the ball wrapped and guided by the cage pocket is no exception.

[0031] like Figure 2 As shown, the sensitive plastic oil deep groove ball bearing of the present invention includes an outer ring 21, an inner ring 22, balls 23 embedded between the outer ring groove and the inner ring groove, a retaining frame 24 that evenly separates the balls along the circumferential direction of the bearing, a porous oil-containing lubricating material plastic oil block unit 25 that provides lubrication for each contact friction pair of the bearing, and a dust cover 26. Figure 2 It can be seen that the bearing contains seven plastic oil block type units 25, which is exactly equal to the number of balls 23. The plastic oil block type units are not connected to each other, and the balls do not contact and rub with the plastic oil.

[0032] The plastic oil is dispersedly injected into each gap between the rolling elements in the bearing in a molten state or a non-molten state. The solidified plastic oil is dispersed in the discrete free space between the rolling elements in the bearing in the form of irregular block units. When the bearing is in operation, the assembly formed by the rolling element, the retaining frame and the solidified plastic oil revolves together. Under the action of centrifugal force and contact friction with the ring raceway, the lubricating oil in the solidified plastic oil escapes from the micropores and lubricates the surface of the ring raceway and the surface of the retaining frame that are in direct contact with them as soon as possible.

[0033] See also Figure 4, if the bearing contains 7 plastic oil block units 25, the filling device is provided with 7 filling channels 41, for example, there are 7 channels 41 in this example. The plastic oil in each channel is quantitative. For example, the plastic oil is quantitatively heated to liquid state and filled into the gap between the rolling elements through the channel 41. The quantitative amount of plastic oil is the filling amount of each solidified plastic oil unit that can wrap around the retaining frame but not in direct contact with the rolling element, and the total amount of all plastic oil filling is 25% to 85% of the full filling. In this example, the amount of the channel can be simulated first, such as heating (such as temperature 180 degrees) to 5 ml of molten state, and adding it to a certain gap between the rolling elements through micropores. The molten state can be solidified at room temperature, and the solidified plastic oil is arranged between the rolling elements in the form of irregular block units. If it can wrap around the retaining frame but not in direct contact with the rolling element, the quantitative filling amount does not need to be adjusted, otherwise the corresponding filling amount is further adjusted. Similarly, the heating temperature can also be tested. After multiple experiments, the corresponding temperature range can be obtained. For example, the plastic oil is heated to between 50 degrees and 300 degrees and then injected in a molten state. Then the temperature is raised or lowered again according to the form of the plastic oil added between the rolling elements, thereby finding a suitable temperature control range. The solidified plastic oil exists between the rolling elements in the bearing in the form of several unconnected plastic oil block-type units. The number of plastic oil block-type units is equal to the number of rolling elements in the bearing. Each unit passes through both sides of the cage and wraps around the cage. Each unit is evenly separated by the rolling elements and the cage pockets or windows along the circumference of the bearing.

[0034] In this example, the plastic oil includes a polymer matrix, a lubricating oil, a fatty acid salt and a solid lubricant, with a weight ratio of 25-45%, 45-75%, 0.1-1.5% and 0-1% respectively. After solidification and molding in the bearing, each plastic oil block unit presents a porous oil-containing plastic state, with a micropore diameter of 1 micron to 10 microns, and each micropore is interconnected in a matrix. The polymer matrix is ​​polyethylene or ultra-high molecular weight polyethylene; the lubricating oil in the plastic oil is an industrial-grade lubricating oil or a food-grade lubricating oil; the fatty acid salt is a stearate; and the solid lubricant is graphite or molybdenum disulfide or polytetrafluoroethylene. Each unit is wrapped around the retaining frame but does not directly contact the rolling element. When the bearing is running, since the rolling element is not in direct contact with the plastic oil, there is no need to overcome the contact friction between the rolling element and the plastic oil. Therefore, the flexibility and speed factor of the bearing are fundamentally improved compared with the fully filled plastic oil bearing of the current technology, and the oil output of the plastic oil is fundamentally reduced compared with the fully filled plastic oil bearing of the current technology, and thus the oil leakage risk of the bearing is fundamentally reduced. The sensitive plastic oil bearing of the present invention inherits the advantages of plastic oil lubrication while overcoming the disadvantages of the existing fully filled plastic oil bearings, such as low sensitivity and speed factor and easy oil leakage.

[0035] Attached Figure 2A specific embodiment of the sensitive plastic oil bearing of the present invention is given by taking a deep groove ball bearing as an example. In the figure, the sensitive plastic oil deep groove ball bearing includes an outer ring 21, an inner ring 22, balls 23 embedded between the outer ring groove and the inner ring groove, a retaining frame 24 that evenly separates the balls along the circumferential direction of the bearing, a porous oil-containing lubricating material plastic oil block unit 25 that provides lubrication for each contact friction pair of the bearing, and a dust cover 26.

[0036] Same as Figure 1 Compared with the prior art deep groove ball bearing fully filled with plastic oil shown in the figure, the present embodiment has the following significant different features: (1) the plastic oil is far from filling the free space inside the bearing and is discontinuous in the inner cavity of the bearing, with only block-shaped plastic oil units distributed between the balls; (2) the number of plastic oil block-type units is the same as the number of balls; (3) each plastic oil block-type unit passes through and wraps around the retaining frame, but does not wrap around the adjacent ball surface, let alone enter the gap between the ball and the retaining frame pocket. These characteristics significantly reduce the amount of plastic oil filled in the bearing. The plastic oil does not wrap around the arc top of the cage. The contact friction area between the plastic oil and the outer ring groove and the inner ring groove is almost doubled, and the plastic oil and the ball have almost no contact friction. Therefore, compared with the existing technology fully filled with plastic oil bearings: (1) The friction torque of the bearing at startup and operation is greatly reduced, and it is therefore sensitive. Its operating flexibility is basically the same as that of grease lubricated bearings, and thus the speed factor of the bearing is improved; (2) The lubrication mechanism of the plastic oil bearing is that when the bearing starts to run, the lubricating oil in the plastic oil overcomes the molecular tension and escapes from the micropores due to the influence of centrifugal force and contact friction heat, and lubricates the contact friction surface. Obviously, when the amount of plastic oil in the bearing decreases, when the contact friction area between the plastic oil and the ball and raceway decreases, the amount of lubricating oil that escapes naturally decreases, which is sufficient but not excessive, thereby avoiding the oil leakage problem caused by excessive escape of lubricating oil in the existing technology fully filled with plastic oil bearings. These characteristics and advantages of the sensitive plastic oil deep groove ball bearing of this embodiment greatly expand the engineering application scope of the plastic oil deep groove ball bearing.

[0037] A limited amount and position filling method for a sensitive plastic oil bearing comprises:

[0038] Plastic oil is dispersed and added to the gaps between the rolling elements in the bearing in a molten or non-molten state.

[0039] The solidified plastic oil is dispersed in the form of irregular block units in the discrete free space between the rolling elements in the bearing. When the bearing is in operation, the assembly formed by the rolling element, the retaining frame and the solidified plastic oil revolves together. Under the action of centrifugal force and contact friction with the ring raceway, the lubricating oil in the solidified plastic oil escapes from the micropores and lubricates the surface of the ring raceway and the surface of the retaining frame that are in direct contact with it as soon as possible.

[0040] The plastic oil is injected into the preheated bearing in an unmelted state, heated and melted in situ at the injection location, and then cooled and solidified. The plastic oil block-shaped unit after solidification does not directly contact the surface of the rolling element. Another implementation scheme is: the plastic oil is injected in a pre-melted state, then cooled and solidified. The plastic oil block-shaped unit after solidification does not directly contact the surface of the rolling element.

[0041] In addition, plastic oil can be added from one or both sides of the bearing.

[0042] All the plastic oil is respectively filled into each gap between the rolling elements in the bearing, and the total amount of plastic oil filled in each bearing is 25% to 85% of the full filling.

[0043] The production of the sensitive plastic oil deep groove ball bearing in this embodiment relies on the plastic oil limited quantity and limited position filling method described in the present invention, which specifically includes two methods, which are described below.

[0044] Method 1:

[0045] (1) Prepare a clean open deep groove ball bearing;

[0046] (2) preparing a plastic oil raw material, wherein the raw material is a mixture of polyethylene, lubricating oil and fatty acid salt according to the aforementioned proportions, and the plastic oil raw material is in a viscous fluid state at room temperature;

[0047] (3) stirring and preheating the plastic oil raw material;

[0048] (4) Preheat the bearings and accessories together;

[0049] (5) Lay the preheated bearing and auxiliary tools flat, and inject the preheated plastic oil fluid into the inner cavity of the bearing from top to bottom or from bottom to top into the gap between the two balls in a limited amount. The plastic oil is heated and melted in situ, and solidifies into shape after cooling;

[0050] (6) Remove assistive devices;

[0051] (7) Pressing the dust cover to make the present invention is as follows Figure 2 Sensitive plastic oil deep groove ball bearing shown.

[0052] Method 2:

[0053] (1) Prepare a clean open deep groove ball bearing;

[0054] (2) preparing a plastic oil raw material, wherein the raw material is a mixture of polyethylene, lubricating oil and fatty acid salt according to the aforementioned proportions, and the plastic oil raw material is in a viscous fluid state at room temperature;

[0055] (3) Preheat the bearings and accessories together;

[0056] (4) heating the plastic oil raw material to a molten state;

[0057] (5) Lay the preheated bearing and auxiliary tools flat, inject the molten plastic oil into the inner cavity of the bearing from top to bottom or from bottom to top into the gap between the two balls in a limited amount, and solidify and form after cooling;

[0058] (6) Remove assistive devices;

[0059] (7) Press the dust cover to make it as shown in the attached Figure 2 The embodiment shown is a sensitive plastic oil deep groove ball bearing.

[0060] The above embodiments take typical deep groove ball bearings as an example. In fact, the sensitive plastic oil bearings and manufacturing methods of seated outer spherical ball bearings and other types and sizes of rolling bearings are the same or similar, and will not be described in detail here.

[0061] The limited quantity and limited position filling method provided in this embodiment can be implemented manually, semi-automatically by machine, or fully automatically by machine. In practice, it depends on the size of the bearing production batch. Regardless of how it is implemented, the above-mentioned limited quantity and limited position filling method and principle remain unchanged.

[0062] The above disclosures are only a few specific embodiments of the present application, but the present application is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present application.

Claims

1. A sensitive plastic oil bearing, comprising an outer ring, an inner ring, a rolling element embedded between the outer ring raceway and the inner ring raceway, a cage, and a porous oil-containing lubricating material plastic oil for providing lubrication for each contact friction pair of the bearing, characterized in that: The plastic oil is dispersedly injected into each gap between the rolling elements in the bearing in a molten state or a non-molten state. The solidified plastic oil is dispersed in the discrete free space between the rolling elements in the bearing in the form of irregular block units. When the bearing is in operation, the assembly formed by the rolling element, the retaining frame and the solidified plastic oil revolves together. Under the action of centrifugal force and contact friction with the ring raceway, the lubricating oil in the solidified plastic oil escapes from the micropores and lubricates the surface of the ring raceway and the surface of the retaining frame that are in direct contact with them as soon as possible.

2. The sensitive plastic oil bearing according to claim 1, characterized in that: The solidified plastic oil exists between the rolling elements in the bearing in the form of a number of unconnected plastic oil block-type units. The number of plastic oil block-type units is equal to the number of rolling elements in the bearing. Each unit passes through both sides of the cage and wraps around the cage. The units are evenly separated along the circumference of the bearing by the rolling elements and the cage pockets or window holes.

3. The sensitive plastic oil bearing according to claim 1 or 2, characterized in that: The plastic oil includes a polymer matrix, lubricating oil, fatty acid salt and solid lubricant, with weight proportions of 25-45%, 45-75%, 0.1-1.5% and 0-1% respectively. After solidification and molding in the bearing, each plastic oil block-type unit presents a porous oil-containing plastic state, with a micropore diameter of 1 micron to 10 microns, and each micropore is interconnected in a matrix.

4. The sensitive plastic oil bearing according to claim 3, characterized in that: The polymer substrate is polyethylene or ultra-high molecular weight polyethylene; the lubricating oil in the plastic oil is industrial-grade lubricating oil or food-grade lubricating oil; the fatty acid salt is stearate; and the solid lubricant is graphite or molybdenum disulfide or polytetrafluoroethylene.

5. The sensitive plastic oil bearing according to claim 3, characterized in that: The arrangement of uniformly dispersing the plastic oil in a molten or non-molten state into the gaps between the rolling elements in the bearing further includes: the plastic oil is quantitatively heated to a liquid state and is added into the gaps between the rolling elements, wherein the quantitative amount of the plastic oil is the amount by which each solidified plastic oil unit can wrap around the retaining frame but does not directly contact the rolling elements, and the total amount of all plastic oil added is 25% to 85% of the full filling amount.

6. A limited amount and position filling method for a sensitive plastic oil bearing, characterized in that: include: Plastic oil is dispersed and added to the gaps between the rolling elements in the bearing in a molten or non-molten state. The solidified plastic oil is dispersed in the form of irregular block units in the discrete free space between the rolling elements in the bearing. When the bearing is in operation, the assembly formed by the rolling element, the retaining frame and the solidified plastic oil revolves together. Under the action of centrifugal force and contact friction with the ring raceway, the lubricating oil in the solidified plastic oil escapes from the micropores and lubricates the surface of the ring raceway and the surface of the retaining frame that are in direct contact with it as soon as possible.

7. A method for limited quantity and position filling of a sensitive plastic oil bearing as claimed in claim 6, characterized in that: The plastic oil is injected into the preheated bearing in an unmelted state, heated and melted in situ at the injection position, and then cooled and solidified. The solidified plastic oil block-shaped unit does not directly contact the surface of the rolling element.

8. A method for limited-quantity and limited-position filling of a sensitive plastic oil bearing as claimed in claim 6, characterized in that: The plastic oil is injected in a pre-molten state, then cooled and solidified into a shape. The solidified plastic oil block-type unit does not directly contact the surface of the rolling element.

9. A method for limited quantity and limited position filling of a sensitive plastic oil bearing as claimed in claim 6, characterized in that: Plastic oil is added from one or both sides of the bearing.

10. A method for limited quantity and limited position filling of a sensitive plastic oil bearing as claimed in claim 6, characterized in that: All the plastic oil is respectively filled into each gap between the rolling elements in the bearing, and the total amount of plastic oil filled in each bearing is 25% to 85% of the full filling.

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