Movable disc bearing lubricating device and air conditioner scroll compressor
By designing a lubrication device for the moving disc bearing in an air conditioning scroll compressor, and utilizing an oil-gas separation structure and flow channel design to achieve circulating lubrication of the refrigerant oil, the problem of insufficient lubrication of the moving disc bearing is solved, thereby improving the compressor's durability and lubrication effect.
Patent Information
- Application Number
- CN202422717976.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-07
AI Technical Summary
The existing air conditioner scroll compressor has insufficient lubrication of the moving disc bearing, which leads to increased friction and accelerated wear, reducing the compressor's durability.
A lubrication device for a moving disc bearing was designed, including a stationary disc flow channel, a bearing housing flow channel, and a drive shaft flow channel. The device collects refrigeration oil through an oil-gas separation structure and uses pressure difference to achieve circulating lubrication of the refrigeration oil, ensuring sufficient lubrication of the moving disc bearing. A filter screen is installed at the oil inlet to filter impurities.
This achieves full lubrication of the moving disc bearing, reduces the risk of wear, improves the durability and reliability of the compressor, and enhances the lubrication effect.
Smart Images
Figure CN223511117U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of air conditioning scroll compressor parts, and in particular to a moving disc bearing lubrication device and an air conditioning scroll compressor. Background Technology
[0002] With the continuous development of new energy vehicle technology, the increasing number of high-power, long-range electric vehicles has driven up the demand for battery thermal management systems. To meet the requirements of battery thermal management, the displacement of electric scroll compressors is gradually increasing, and the requirements for compressor durability and other aspects are also improving.
[0003] In the moving bearing area of an electric scroll compressor, the adequacy of lubricating oil supply is crucial due to the high coefficient of friction and heavy workload. Insufficient lubricating oil supply will lead to increased friction and accelerated wear, thereby shortening the compressor's service life. However, current technology does not include a dedicated lubrication device for the moving bearing, resulting in inadequate lubrication of the moving bearing, causing severe friction and wear, and reducing the compressor's durability.
[0004] In other words, existing air conditioner scroll compressors have a technical problem of insufficient lubrication of the moving disc bearing. Utility Model Content
[0005] Therefore, it is necessary to provide a moving disc bearing lubrication device and an air conditioning scroll compressor to address the above-mentioned technical problems.
[0006] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:
[0007] On the one hand, a lubrication device for a moving disc bearing is provided, comprising:
[0008] The stationary plate flow channel is located on the stationary plate of the scroll compressor and connects to the high-pressure chamber. It is used to provide a flow channel for the refrigeration oil in the high-pressure chamber. The high-pressure chamber is connected to the exhaust port of the stationary plate and the oil-gas separation structure of the scroll compressor. The high-pressure chamber is used to collect the refrigeration oil obtained after being processed by the oil-gas separation structure.
[0009] The bearing housing flow channel is located on the bearing housing of the scroll compressor and connects the stationary plate flow channel and the secondary high-pressure chamber. The secondary high-pressure chamber is a cavity located between the bearing housing, the drive shaft of the scroll compressor, and the moving plate. The secondary high-pressure chamber is connected to the bearing clearance of the moving plate, which is the clearance between the outer ring and the inner ring of the moving plate bearing.
[0010] The drive shaft flow channel is located on the drive shaft and is connected to the bearing clearance and the low-pressure chamber respectively; the low-pressure chamber is the cavity between the motor, motor housing, drive shaft and bearing seat of the scroll compressor.
[0011] This embodiment has the following technical effects or advantages:
[0012] The aforementioned moving disc bearing lubrication device includes a stationary disc flow channel, a bearing housing flow channel, and a drive shaft flow channel. The bottom of the high-pressure chamber collects refrigerant oil after oil-gas separation. The stationary disc flow channel connects to the high-pressure chamber, introducing the collected refrigerant oil into the bearing housing flow channel, which in turn connects to the secondary high-pressure chamber. The pressure in the secondary high-pressure chamber is lower than that in the high-pressure chamber, ensuring that the refrigerant oil flows through the stationary disc flow channel and the bearing housing flow channel to reach the secondary high-pressure chamber. The secondary high-pressure chamber connects to the bearing clearance of the moving disc bearing, allowing the refrigerant oil to enter the moving disc clearance and thus fully lubricate the moving disc bearing. One end of the drive shaft flow channel communicates with the moving disc clearance, and the other end connects to the low-pressure chamber. The pressure in the low-pressure chamber is lower than that in the secondary high-pressure chamber, ensuring that the refrigerant oil flows through the moving disc clearance and the drive shaft flow channel to reach the low-pressure chamber, guaranteeing effective circulation of the lubricating oil and thus fully lubricating the moving disc bearing, improving the compressor's durability.
[0013] In one embodiment, a filter screen is provided on the oil inlet at the end of the stationary plate flow channel near the high-pressure chamber for filtering the refrigeration oil.
[0014] This embodiment has the following technical effects or advantages:
[0015] The aforementioned moving disc bearing lubrication device has a filter screen installed at the oil inlet near the high-pressure chamber end of the stationary disc flow channel. This screen can effectively filter impurities and particles in the refrigeration oil. This design ensures the cleanliness of the refrigeration oil entering the moving disc bearing, reduces the risk of wear on the moving disc bearing, improves the lubrication effect, and enhances the durability of the scroll compressor.
[0016] In one embodiment, the moving disc bearing is a rolling bearing. It can be understood that the moving disc bearing can be either a sliding bearing or a rolling bearing; specifically, deep groove ball bearings are commonly used in air conditioning scroll compressors.
[0017] In one embodiment, the moving disc bearing is a sliding bearing.
[0018] This embodiment has the following technical effects or advantages:
[0019] Understandably, traditional deep groove ball bearings used in compressors have gradually revealed drawbacks such as high noise levels, poor durability, and high lubrication requirements. Therefore, sliding bearings are chosen for rotating discs. Sliding bearings offer advantages such as low noise and high load capacity, enabling stable operation under high loads and high temperatures, thus improving the reliability of air conditioning scroll compressors. Furthermore, sliding bearings typically have a larger contact area, which helps form a more uniform oil film in the lubricating oil layer, thereby improving lubrication and reducing wear.
[0020] In one embodiment, the drive shaft flow channel includes a central flow channel and side flow channels; the central flow channel communicates with the bearing clearance and is located at the eccentric axis of the drive shaft; the side flow channels connect the central flow channel and the low-pressure chamber respectively and are perpendicular to the eccentric axis of the drive shaft.
[0021] This embodiment has the following technical effects or advantages:
[0022] It is understood that the drive shaft flow channel can consist of multiple small channels, as long as they are located on the drive shaft and connected to the bearing clearance and low-pressure chamber, ensuring that the refrigerant oil in the bearing clearance circulates into the low-pressure chamber. In this embodiment, it includes a central flow channel and side flow channels. The central flow channel is located at the eccentric shaft of the drive shaft, which can more efficiently guide the refrigerant oil in the bearing clearance to the low-pressure chamber, thereby improving the lubrication effect and reducing wear.
[0023] In one embodiment, the bearing housing flow channel includes a first flow channel and a second flow channel; the first flow channel is connected to the stationary plate flow channel and the second flow channel respectively; the first flow channel is located on the end face of the bearing housing near the stationary plate and is in the shape of a quarter circle arc, and the center of the circle containing the first flow channel is located on the central axis of the drive shaft; the second flow channel is located on the radius of the arc containing the first flow channel; the second flow channel is connected to the secondary high-pressure chamber.
[0024] This embodiment has the following technical effects or advantages:
[0025] It is understood that the bearing housing flow channel can consist of multiple small flow channels, as long as they are located on the bearing housing, connecting the stationary plate flow channel and the secondary high-pressure chamber, ensuring that the refrigerant oil from the stationary plate flow channel flows into the secondary high-pressure chamber. In this embodiment, the bearing housing flow channel has only two small flow channels. The inlet of the first flow channel is connected to the outlet of the stationary plate flow channel (located on the compressor stationary plate near the bottom motor housing), at a lower position. The refrigerant oil is first guided to a higher position, specifically to a position approximately the same height as the bearing, and then introduced into the secondary high-pressure chamber through the second flow channel. This ensures effective flow and distribution of the refrigerant oil, better lubricates the moving plate bearing, and improves the lubrication effect.
[0026] In one embodiment, the bearing housing flow channel further includes a third flow channel and a fourth flow channel; the third flow channel connects the second flow channel and the fourth flow channel respectively; the third flow channel is annular and concentric with the circle containing the first flow channel, and is located between the first flow channel and the secondary high-pressure chamber; the fourth flow channel connects to the secondary high-pressure chamber, is located on the radius of the circle containing the third flow channel, and is close to the end where the first flow channel connects to the stationary plate flow channel.
[0027] This embodiment has the following technical effects or advantages:
[0028] Understandably, the flow channels can be further improved and upgraded based on the first and second flow channels. The second flow channel connects to a ring-shaped third flow channel, and then a fourth flow channel is set at another location on the third flow channel, connecting the third flow channel and the secondary high-pressure chamber. Specifically, it can be set at the end near the connection between the first flow channel and the stationary plate flow channel. With this design, the refrigeration oil can flow into the secondary high-pressure chamber through the second flow channel, and some refrigeration oil will also flow into the third flow channel, and then into the secondary high-pressure chamber through the fourth flow channel. The refrigeration oil flows out from different outlets (the second and fourth flow channels), ensuring that it flows more evenly into the moving plate clearance, thereby greatly improving the lubrication effect.
[0029] In one embodiment, the oil-gas separation structure is an oil separator.
[0030] In one embodiment, the oil-gas separation structure is a filter screen.
[0031] In one embodiment, the oil-gas separation structure is a baffle.
[0032] On the other hand, an air conditioning scroll compressor is also provided, which is equipped with the aforementioned moving disc bearing lubrication device. Attached Figure Description
[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0034] Figure 1 This is a schematic diagram of an air conditioner scroll compressor in one embodiment;
[0035] Figure 2 This is a schematic diagram of the lubrication device for the moving disc bearing in one embodiment;
[0036] Figure 3 for Figure 2 A magnified view of a section at point A;
[0037] Figure 4 for Figure 2 A magnified view of section B;
[0038] Figure 5 This is a schematic diagram of the bearing housing flow channel in one embodiment.
[0039] Reference numerals: 1: Motor housing; 2: Motor stator; 3: Motor rotor;
[0040] 4: Bearing housing; 4-1: First flow channel; 4-2: Second flow channel; 4-3: Third flow channel; 4-4: Fourth flow channel; 4-5: Wear-resistant plate; 4-6: Secondary high-pressure chamber;
[0041] 5: Balance block; 6: Moving disc; 7: Stationary disc; 7-1: Exhaust port; 7-2: High pressure chamber; 7-3: Stationary disc flow channel; 7-3-1: Oil inlet; 8: Top cover; 8-1: Oil separator pipe;
[0042] 9: Filter screen; 10: Moving disc bearing; 10-1: Bearing outer ring; 10-2: Bearing inner ring; 11: Shaft seal; 12: Drive shaft; 12-1: Central flow channel; 12-2: Side flow channel; 13: Low-pressure chamber. Detailed Implementation
[0043] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.
[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0045] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0046] In one embodiment, a schematic diagram of an air conditioning scroll compressor is shown below. Figure 1 As shown in the diagram, the lubrication device for the moving disc bearing is as follows: Figure 2 As shown, Figure 2 A magnified view of the area at point A is shown below. Figure 3 As shown, Figure 2 A magnified view of the area at point B is shown below. Figure 4 As shown, combined with Figures 1-4 This application provides a lubrication device for a moving disc bearing, comprising:
[0047] The stationary plate flow channel 7-3 is located on the stationary plate 7 of the scroll compressor and connects to the high-pressure chamber 7-2. It is used to provide a flow channel for the refrigeration oil in the high-pressure chamber 7-2. The high-pressure chamber 7-2 is connected to the exhaust port 7-1 of the stationary plate 7 and the oil separator pipe 8-1 of the scroll compressor. The high-pressure chamber 7-2 is used to collect the refrigeration oil obtained after being processed by the oil separator pipe 8-1. A filter screen 9 is installed on the oil inlet 7-3-1 at the end of the stationary plate flow channel 7-3 near the high-pressure chamber 7-2 for filtering the refrigeration oil.
[0048] The bearing housing flow channel is located on the bearing housing 4 of the scroll compressor, connecting the stationary disc flow channel 7-3 and the secondary high-pressure chamber 4-6. The secondary high-pressure chamber 4-6 is a cavity located between the bearing housing 4, the drive shaft 12 of the scroll compressor, the moving disc 6, the shaft seal 11, and the wear-resistant plate 4-5. The secondary high-pressure chamber 4-6 is connected to the bearing clearance of the moving disc 6, which is the clearance between the outer ring 10-1 and the inner ring 10-2 of the moving disc bearing 10. The moving disc bearing 10 is a sliding bearing.
[0049] Specifically, in this embodiment, the schematic diagram of the bearing housing flow channel is as follows: Figure 5 As shown, Figure 5 for Figure 1 The right view of the middle bearing housing 4, combined with Figures 1-5 As shown: The bearing housing flow channel includes a first flow channel 4-1, a second flow channel 4-2, a third flow channel 4-3, and a fourth flow channel 4-4. The first flow channel 4-1 is connected to the stationary plate flow channel 7-3 and the second flow channel 4-2 respectively; the first flow channel 4-1 is located on the end face of the bearing housing 4 near the stationary plate 7, and is in the shape of a quarter circle arc, with the center of the circle containing the first flow channel 4-1 located on the central axis of the drive shaft 12; the second flow channel 4-2 is located on the radius of the arc containing the first flow channel 4-1; the second flow channel 4-2 is connected to the secondary high-pressure chamber 4-6. The third flow channel 4-3 connects to the second flow channel 4-2 and the fourth flow channel 4-4 respectively; the third flow channel 4-3 is annular and concentric with the circle containing the first flow channel 4-1, located between the first flow channel 4-1 and the secondary high-pressure chamber 4-6; the fourth flow channel 4-4 connects to the secondary high-pressure chamber 4-6, located on the radius of the circle containing the third flow channel 4-3, close to the end where the first flow channel 4-1 connects to the stationary plate flow channel 7-3.
[0050] The drive shaft flow channel is located on the drive shaft 12 and is connected to the bearing clearance and the low-pressure chamber 13 respectively. The low-pressure chamber 13 is the cavity between the motor stator 2, motor rotor 3, motor housing 1, drive shaft 12 and bearing seat 4 of the scroll compressor.
[0051] Specifically, in this embodiment, the drive shaft flow channel 12 includes a central flow channel 12-1 and a side flow channel 12-2; the central flow channel 12-1 is connected to the bearing clearance and is located at the eccentric shaft of the drive shaft 12; the side flow channel 12-2 is connected to the central flow channel 12-1 and the low-pressure chamber 13 respectively, and is perpendicular to the eccentric shaft of the drive shaft 12.
[0052] Specifically, in this embodiment, the compressed oil-gas mixture is discharged through the exhaust port 7-1 on the back of the stationary plate 7 and enters the high-pressure chamber 7-2 formed by the stationary plate 7 and the upper cover 8. After oil-gas separation through the oil separator pipe 8-1, the refrigerant is discharged from the compressor (e.g., Figure 2 (Solid line portion), the refrigeration oil flows into the bottom oil storage tank under the influence of gravity (e.g., Figure 2(Dashed line section). The level of the refrigeration oil in the oil reservoir of the high-pressure chamber 7-2 is higher than the oil inlet 7-3-1 of the stationary plate flow channel 7-3. Under the pressure of the high-pressure chamber 7-2, the refrigeration oil is filtered by the filter screen 9 and then forced into the stationary plate flow channel 7-3. The refrigeration oil flows into the flow channel of the bearing housing 4, into the first flow channel 4-1 of the bearing housing flow channel, and then into the secondary high-pressure chamber 4-6 through the second flow channel 4-2. When flowing through the second flow channel 4-2, some refrigeration oil will also flow into the third flow channel 4-3, and then into the secondary high-pressure chamber 4-6 through the fourth flow channel 4-4. Because the drive shaft 12 has a central flow channel 12-1 at the eccentric shaft, the central flow channel 12-1 is connected to the low-pressure chamber 13 through the side flow channel 12-2. The refrigerant oil in the secondary high-pressure chamber 4-6 enters the central flow channel 12-1 through the gap between the outer ring 10-1 and the inner ring 10-2 of the moving disc bearing 10 under the action of pressure difference, and is discharged to the low-pressure chamber 13. Finally, it is compressed again by the refrigerant and discharged into the high-pressure chamber 7-2 by the moving disc 6 and the stationary disc 7, forming a circulation of refrigerant oil and lubricating the moving disc bearing 10.
[0053] This embodiment has the following technical effects or advantages:
[0054] The aforementioned moving disc bearing lubrication device utilizes the refrigerant oil obtained after oil-gas separation for lubrication, enabling the recycling of refrigerant oil, effectively utilizing resources, and improving the compressor's economy. The pressure in the secondary high-pressure chamber 4-6 is lower than that in the high-pressure chamber 7-2, and the pressure in the low-pressure chamber 13 is lower than that in the secondary high-pressure chamber 4-6. This ensures that the refrigerant oil flows through the stationary disc flow channel 7-3 and the bearing housing flow channel to reach the secondary high-pressure chamber 4-6, and then flows through the moving disc clearance and drive shaft flow channel to reach the low-pressure chamber 13, guaranteeing effective circulation of the lubricating oil. This ensures sufficient lubrication of the moving disc bearing 10, improving the compressor's durability. A filter screen 9 is installed at the oil inlet 7-3-1 to effectively filter impurities and particles in the refrigerant oil, ensuring the cleanliness of the refrigerant oil entering the moving disc bearing 10, reducing the risk of wear on the moving disc bearing 10, and improving lubrication. The moving disc bearing 10 is a sliding bearing. Sliding bearings typically have a larger contact area, which helps form a more uniform oil film in the lubricating oil layer, thereby improving lubrication and reducing wear.
[0055] Furthermore, in this embodiment, the drive shaft flow channel includes a central flow channel 12-1 and a side flow channel 12-2. The central flow channel 12-1 is located at the eccentric shaft of the drive shaft 12, which can more efficiently guide the refrigerant oil in the bearing clearance to the low-pressure chamber 13, thereby improving the lubrication effect. Moreover, the design of the bearing housing flow channel in this embodiment allows the refrigerant oil to flow into the secondary high-pressure chamber 4-6 through the second flow channel 4-2, and some of the refrigerant oil will also flow into the third flow channel 4-3, and then into the secondary high-pressure chamber 4-6 through the fourth flow channel 4-4. The refrigerant oil flows out from different outlets, ensuring that it flows more evenly into the moving plate clearance, thereby greatly improving the lubrication effect.
[0056] In one embodiment, an air conditioning scroll compressor is provided, including the moving disc bearing lubrication device provided in any of the above embodiments.
[0057] It is understood that the structure of the air conditioner scroll compressor can be understood by referring to the corresponding structure in each embodiment of the moving disc bearing lubrication device mentioned above, and will not be repeated here or in the following text.
[0058] Specifically, those skilled in the art will understand that, in addition to the moving disc bearing lubrication device, the aforementioned equipment may also include other necessary components not mentioned above, such as... Figure 1 As shown, it may also include a motor housing 1, a motor stator 2, a motor rotor 3, a bearing housing 4, a balance block 5, a moving disc 6, a stationary disc 7, a top cover 8, an oil separator pipe 8-1 (or other oil-gas separation structures), and a drive shaft 12, etc. It may also include other necessary components not mentioned above, which can be understood by referring to the existing structural components of the existing devices in this field.
[0059] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A lubrication device for a moving disc bearing, characterized in that, include: The stationary plate flow channel is installed on the stationary plate of the scroll compressor and connected to the high-pressure chamber to provide a flow channel for the refrigerant oil in the high-pressure chamber. The high-pressure chamber is connected to the exhaust port of the stationary plate and the oil-gas separation structure of the scroll compressor, respectively. The high-pressure chamber is used to collect the refrigeration oil obtained after being processed by the oil-gas separation structure. The bearing housing flow channel is disposed on the bearing housing of the scroll compressor and connects the stationary disc flow channel and the secondary high-pressure chamber. The secondary high-pressure chamber is a cavity located between the bearing housing, the drive shaft of the scroll compressor, and the moving disk; the secondary high-pressure chamber is connected to the bearing clearance of the moving disk, and the bearing clearance is the gap between the outer ring and the inner ring of the moving disk bearing; A drive shaft flow channel is disposed on the drive shaft and communicates with the bearing clearance and the low-pressure chamber respectively; the low-pressure chamber is the cavity between the motor, motor housing, drive shaft and bearing seat of the scroll compressor.
2. The lubrication device for the moving disc bearing according to claim 1, characterized in that, A filter screen is provided on the oil inlet at the end of the static flow channel near the high-pressure chamber for filtering the refrigeration oil.
3. The lubrication device for the moving disc bearing according to claim 2, characterized in that, The moving disc bearing is a rolling bearing.
4. The lubrication device for the moving disc bearing according to claim 2, characterized in that, The moving disc bearing is a sliding bearing.
5. The lubrication device for the moving disc bearing according to claim 4, characterized in that, The drive shaft flow channel includes a central flow channel and a side flow channel; The central flow channel is in communication with the bearing clearance and is located at the eccentric shaft of the drive shaft; The side channels are connected to the central channel and the low-pressure chamber respectively, and are perpendicular to the eccentric axis of the drive shaft.
6. The lubrication device for the moving disc bearing according to any one of claims 1 to 5, characterized in that, The bearing housing flow channel includes a first flow channel and a second flow channel; The first flow channel connects the stationary disk flow channel and the second flow channel respectively; the first flow channel is located on the end face of the bearing seat near the stationary disk, and is in the shape of a quarter circle arc, with the center of the circle containing the first flow channel located on the central axis of the drive shaft; The second flow channel is located on the radius of the arc where the first flow channel is located; the second flow channel is connected to the secondary high-pressure chamber.
7. The lubrication device for the moving disc bearing according to claim 6, characterized in that, The bearing housing flow channel also includes a third flow channel and a fourth flow channel; The third flow channel connects the second flow channel and the fourth flow channel respectively; the third flow channel is annular in shape, concentric with the circle containing the first flow channel, and is located between the first flow channel and the secondary high-pressure chamber; The fourth flow channel connects to the secondary high-pressure chamber and is located on the radius of the circle containing the third flow channel, close to the end where the first flow channel connects to the stationary plate flow channel.
8. The lubrication device for the moving disc bearing according to claim 1, characterized in that, The oil-gas separation structure is an oil separator.
9. The lubrication device for the moving disc bearing according to claim 1, characterized in that, The oil-gas separation structure is a filter screen or a baffle.
10. An air conditioning scroll compressor, characterized in that, Includes a lubrication device for the moving disc bearing according to any one of claims 1-9.