Multi-point contact ball bearing of medical CT (Computed Tomography) machine
By designing the rolling connection structure and air film technology of multi-point contact ball bearings, the frictional heat generation and load dispersion problems of traditional bearings in CT machines are solved, and high precision, low friction, stability and convenient maintenance are achieved.
Patent Information
- Application Number
- CN202510563110.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2025-07-25
AI Technical Summary
Traditional bearings in medical CT machines are caused by frictional heat generation, large friction resistance, and inability to effectively disperse loads, resulting in reduced scanning accuracy, unstable equipment operation, and frequent maintenance, which increases costs.
A medical CT machine multi-point contact ball bearing is designed, adopting a rolling connection structure of multiple contact balls, balls and rail grooves, combined with air film technology, reduce friction, uniformly disperse loads, improve stability and installation convenience.
It significantly improves the scanning accuracy and operating stability of the CT machine, reduces energy loss and maintenance frequency, extends bearing life, and reduces equipment costs.
Smart Images
Figure CN120367943A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of bearings, and more specifically, to a multi-point contact ball bearing for a medical CT scanner. Background Art
[0002] In the modern medical field, computed tomography (CT) scanners play a crucial role, capable of providing detailed information on the internal structure of the human body for accurate disease diagnosis. Core components of CT scanners, such as the rotating gantry and detectors, need to rotate at high speed and with high precision during operation. As key components supporting these rotating parts, the performance of bearings directly affects the overall performance of CT scanners.
[0003] Currently, medical CT scanners have extremely high requirements for scanning accuracy, imaging quality, and equipment operation stability. However, traditional bearings exhibit many deficiencies when faced with the complex working environment and strict performance requirements of CT scanners. Under high-speed rotation conditions, the phenomenon of heat generation due to friction in traditional bearings is relatively severe. This not only leads to a large amount of energy loss, reducing the operating efficiency of CT scanners, but also may cause thermal deformation due to heat accumulation, thereby affecting scanning accuracy. At the same time, the relatively high frictional resistance also increases the wear of rotating parts and shortens the service life of bearings. Frequent maintenance and replacement of bearings not only increase medical costs but also affect the normal use of CT scanners and reduce medical work efficiency.
[0004] In addition, CT scanners need to perform frequent start-stop operations during operation and are subject to radial and axial loads in different directions. When traditional bearings cope with these complex loading conditions, their structural design may not be able to effectively disperse and withstand the loads, easily resulting in local stress concentration problems. This will further accelerate the wear of bearings and may even lead to bearing failure, seriously affecting the stability and reliability of CT scanners and posing a threat to the continuity and accuracy of medical diagnosis work.
[0005] Therefore, a multi-point contact ball bearing for a medical CT scanner is proposed. Summary of the Invention
[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a multi-point contact ball bearing for a medical CT scanner to solve the problems raised in the above background art.
[0007] To achieve the above object, the present invention provides the following technical solution: A multi-point contact ball bearing for a medical CT machine, comprising an outer ring, an inner ring assembly, a retaining plate, contact balls, a cage, a first ball, a second ball, a first rail groove, a second rail groove, and a third rail groove; the inner ring assembly is disposed inside the outer ring, and the inner ring assembly includes a lower inner ring, an upper inner ring, and a convex disk. The lower inner ring and the upper inner ring are fixedly connected by stud bolts. Convex disks are provided on the outer sides of the lower inner ring and the upper inner ring. First ball grooves and second ball grooves are respectively formed on the outer sides of the lower inner ring and the upper inner ring. The first ball groove and the second ball groove are respectively in rolling connection with the first ball and the second ball. The first ball and the second ball are respectively disposed inside the third rail groove and the second rail groove. The third rail groove and the second rail groove are formed on the inner side of the retaining plate. The contact balls are disposed inside the cage. The cage includes a lower frame body, an upper frame body, and a pin. The lower frame body and the upper frame body are connected by a pin. The contact balls are in rolling connection with the first rail groove. The first rail groove is formed on the inner side of the outer ring;
[0008] An annular air passage is formed inside the retaining plate. The annular air passage is connected with an air injection passage. A plurality of exhaust ports are equidistantly formed on the inner wall of the retaining plate. Each of the exhaust ports is inclined and is communicated with the annular air passage.
[0009] Preferably, the number of the first balls and the second balls is plural. The plurality of first balls and the second balls are respectively equidistantly distributed inside the first ball groove and the second ball groove.
[0010] Preferably, the number of the contact balls is plural. The plurality of contact balls are equidistantly distributed inside the cage.
[0011] Preferably, the number of the retaining plates is two. The two retaining plates are respectively disposed on the outer sides of the lower inner ring and the upper inner ring.
[0012] Preferably, the outer side of the convex disk is in contact with the inner side of the retaining plate.
[0013] Preferably, the shapes of the lower frame body and the upper frame body are both annular, and arc-shaped grooves for clamping the contact balls are formed.
[0014] Preferably, the number of the pins is plural. The plurality of pins are equidistantly distributed between the lower frame body and the upper frame body.
[0015] Preferably, the shapes of the lower inner ring and the upper inner ring are both annular. The lower inner ring is provided with a plurality of first screw holes. The upper inner ring is provided with a plurality of through holes corresponding to and mating with the first screw holes. The upper inner ring and the lower inner ring are fixedly connected by a plurality of stud bolts passing through the through holes and the first screw holes.
[0016] Preferably, the outer ring is annular in shape, and a plurality of second screw holes are equidistantly arranged in a circumferential manner on both sides of the outer ring. Corresponding mounting holes are provided on the retaining plate, and the retaining plate and the outer ring are fixedly connected by a plurality of stud bolts passing through the mounting holes and the second screw holes.
[0017] The technical effects and advantages of the present invention are as follows:
[0018] 1. By evenly distributing a plurality of contact balls in the cage and rollingly connecting them with the first track groove of the outer ring, and at the same time, a plurality of first balls and second balls respectively roll in the corresponding ball grooves and track grooves, the contact between the components of the bearing is more uniform and stable, effectively reducing the deviation during rotation, significantly improving the scanning imaging accuracy of the medical CT machine, and providing a more accurate diagnosis basis for doctors.
[0019] 2. By the first ball and the second ball rolling in different track grooves respectively, and with a large number of them, and the inner ring assembly being in close contact with the retaining plate through the convex disc, they can more efficiently disperse and bear radial and axial loads under their combined action. This enables the bearing to still stably support the rotating components under the complex working conditions of the medical CT machine, such as high-speed rotation and frequent start-stop, ensuring the normal operation of the equipment, and enhancing the adaptability of the equipment to different working conditions.
[0020] 3. By adopting a rolling connection method between the components, such as the rolling friction between the contact balls and the track grooves, and between the balls and the ball grooves and track grooves, the friction resistance is significantly reduced compared with the traditional sliding friction. This not only reduces the energy loss, improves the operation efficiency of the CT machine, but also reduces the heat generated by friction, helps to extend the service life of the bearing and related components, reduces the equipment maintenance frequency, and lowers the maintenance cost.
[0021] 4. By connecting the lower inner ring and the upper inner ring of the inner ring assembly with stud bolts, and contacting the retaining plate through the convex disc, and connecting the lower frame body and the upper frame body of the cage with a plurality of pin bolts, the components are precisely matched with each other. This stable structure effectively reduces the risk of component loosening and displacement during the long-term continuous operation of the medical CT machine, improves the stability and reliability of the equipment operation, reduces the downtime caused by equipment failures, and ensures the continuity and efficiency of medical work.
[0022] 5. By using stud bolts to connect the outer ring with the retaining plate and between the upper and lower inner rings of the inner ring assembly, and with reasonable structural designs of each component, it is easy to disassemble and install. During the production and assembly stage of the CT machine, the assembly speed can be accelerated, and the production cost can be reduced; during equipment maintenance and repair, damaged bearing components can be quickly replaced, the repair time can be shortened, and the overall use efficiency of the equipment can be improved.
[0023] 6. By connecting the gas injection channel to a gas source, during operation, gas is injected into the gas injection channel by the gas source. The gas enters the annular air duct and then is discharged from the exhaust port. As a result, the discharged gas is discharged from the gap at the connection between the baffle and the convex disk, enabling the formation of an air film at this location, avoiding sliding friction between the baffle and the convex disk, thereby improving the smoothness of the bearing rotation. At the same time, it prevents dust from entering and can cool the bearing. Brief Description of the Drawings
[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.
[0025] Figure 2 It is a schematic diagram of the sectional structure of the present invention.
[0026] Figure 3 It is a schematic diagram of the internal structure of the bearing of the present invention.
[0027] Figure 4 It is a schematic diagram of the structure of the contact ball and the outer ring mating of the present invention.
[0028] Figure 5 It is a schematic diagram of the structure of the cage connected to the contact ball of the present invention.
[0029] Figure 6 It is a schematic diagram of the structure of the outer ring of the present invention.
[0030] Figure 7 It is a schematic diagram of the structure of the baffle of the present invention.
[0031] Figure 8 It is a schematic diagram of the structure of the inner ring assembly of the present invention.
[0032] Figure 9 It is a schematic diagram of the sectional structure of the top of the baffle of the present invention.
[0033] Figure 10 It is a schematic diagram of the cross-sectional structure of the baffle of the present invention.
[0034] Reference numerals are: 1. Outer ring; 2. Inner ring assembly; 201. Lower inner ring; 202. Upper inner ring; 203. Convex disk; 204. First ball groove; 205. Second ball groove; 3. Baffle; 4. Contact ball; 5. Cage; 501. Lower frame body; 502. Upper frame body; 503. Pin; 6. First ball; 7. Second ball; 8. First rail groove; 9. Second rail groove; 10. Third rail groove; 11. Annular air duct; 12. Gas injection channel; 13. Exhaust port. Detailed Description of the Invention
[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0036] As shown in the attached Figures 1 - 8 A multi-point contact ball bearing for a medical CT machine, including an outer ring 1, an inner ring assembly 2, a retaining plate 3, contact balls 4, a cage 5, a first ball 6, a second ball 7, a first track groove 8, a second track groove 9 and a third track groove 10; the inner ring assembly 2 is arranged inside the outer ring 1, and the inner ring assembly 2 includes a lower inner ring 201, an upper inner ring 202 and a convex disc 203. The lower inner ring 201 and the upper inner ring 202 are fixedly connected by a stud. Convex discs 203 are arranged on the outer sides of the lower inner ring 201 and the upper inner ring 202. First ball grooves 204 and second ball grooves 205 are opened on the outer sides of the lower inner ring 201 and the upper inner ring 202. The first ball grooves 204 and the second ball grooves 205 are respectively in rolling connection with the first ball 6 and the second ball 7. The first ball 6 and the second ball 7 are respectively arranged inside the third track groove 10 and the second track groove 9. The third track groove 10 and the second track groove 9 are opened on the inner side of the retaining plate 3. The contact balls 4 are arranged inside the cage 5. The cage 5 includes a lower frame body 501, an upper frame body 502 and a pin 503. The lower frame body 501 and the upper frame body 502 are connected by the pin 503. The contact balls 4 are in rolling connection with the first track groove 8. The first track groove 8 is opened on the inner side of the outer ring 1;
[0037] An annular air passage 11 is opened inside the retaining plate 3. The annular air passage 11 is connected with an air injection passage 12. A plurality of exhaust ports 13 are equidistantly opened on the inner wall of the retaining plate 3. Each of the exhaust ports 13 is inclined, and each exhaust port 13 is communicated with the annular air passage 11.
[0038] In specific implementation, the inner ring assembly 2 is placed inside the outer ring 1. The lower inner ring 201 and the upper inner ring 202 are fixedly connected by studs. Convex discs 203 are provided on the outer sides of both of them. The first ball grooves 204 and the second ball grooves 205 are respectively formed on the outer sides. A plurality of first balls 6 are equidistantly distributed in the first ball groove 204 and are in rolling connection with the third rail groove 10. A plurality of second balls 7 are equidistantly distributed in the second ball groove 205 and are in rolling connection with the second rail groove 9. The third rail groove 10 and the second rail groove 9 are formed on the inner side of the retaining plate 3. The number of the retaining plates 3 is two, which are respectively located on the outer sides of the lower inner ring 201 and the upper inner ring 202. And the outer side of the convex disc 203 is in contact with the inner side of the retaining plate 3. A plurality of contact balls 4 are equidistantly distributed inside the cage 5. The lower frame body 501 and the upper frame body 502 of the cage 5 are connected by a plurality of equidistantly distributed pins 503, and both are annular and are provided with arc grooves for clamping the contact balls 4. The contact balls 4 are in rolling connection with the first rail groove 8 formed on the inner side of the outer ring 1. The outer ring 1 is annular, and a plurality of second screw holes are equidistantly formed on the circumferences on both sides thereof. A plurality of mounting holes are formed on the retaining plate 3. The two are fixedly connected by a plurality of studs passing through the mounting holes and the second screw holes. The lower inner ring 201 is provided with a plurality of first screw holes, and the upper inner ring 202 is provided with a plurality of through holes corresponding to and cooperating with the first screw holes. The upper inner ring 202 and the lower inner ring 201 are fixedly connected by a plurality of studs passing through the through holes and the first screw holes. Through the above structural design, the bearing realizes rolling friction at multiple contact points, reduces the friction resistance, improves the rotational flexibility, meets the requirements of high precision, low friction and high stability of the medical CT machine, helps to improve the accuracy of the CT machine scanning imaging and the stability of the equipment operation, and at the same time facilitates the installation and disassembly of each component, and is convenient for maintenance and replacement;
[0039] And during use, by connecting the air injection channel 12 with the air source, during operation, air is injected into the air injection channel 12 by the air source. The gas enters the annular air duct 11 and then is discharged from the exhaust port 13, so that the discharged gas is discharged from the gap at the connection between the retaining plate 3 and the convex disc 203, so that an air film can be formed at this place, avoiding sliding friction between the retaining plate 3 and the convex disc 203, thereby improving the smoothness of the bearing rotation. At the same time, dust entry is avoided, and the bearing can be cooled down.
[0040] The number of the first balls 6 and the second balls 7 is multiple, and the multiple first balls 6 and the second balls 7 are respectively equidistantly distributed inside the first ball groove 204 and the second ball groove 205.
[0041] During specific implementation, the number of the first balls 6 and the second balls 7 is multiple. During installation, these balls are respectively placed at equal intervals inside the corresponding first ball grooves 204 and second ball grooves 205, enabling them to roll smoothly within the ball grooves and maintain a good rolling connection relationship with the corresponding rail grooves. The equal-distance distribution of multiple balls can make the force between the inner ring assembly 2 and the retaining plate 3 more uniform, reduce local wear, improve the overall load-bearing capacity and service life of the bearing, thereby ensuring the stable support and precise rotation of relevant rotating components during the long-term operation of the medical CT machine.
[0042] The number of the contact balls 4 is multiple, and multiple contact balls 4 are evenly distributed inside the cage 5.
[0043] During specific implementation, by preparing multiple contact balls 4, during the installation of the cage 5, these contact balls 4 are placed at equal intervals inside the cage 5, enabling the contact balls 4 to stably form a rolling connection with the first rail groove 8 under the constraint of the cage 5, ensuring the normal rolling and force transmission of the contact balls 4 during the operation of the bearing. The equal-distance distribution of multiple contact balls 4 can evenly distribute the contact pressure between the outer ring 1 and the inner ring assembly 2, reduce the force on a single contact ball 4, reduce wear, improve the rotation accuracy and stability of the bearing, and further enhance the clarity and accuracy of the scanning imaging of the medical CT machine, meeting the requirements of high-precision operation for medical equipment.
[0044] The number of the retaining plates 3 is two, and two retaining plates 3 are respectively arranged on the outer sides of the lower inner ring 201 and the upper inner ring 202.
[0045] During specific implementation, by taking two retaining plates 3 and respectively installing them on the outer sides of the lower inner ring 201 and the upper inner ring 202, enabling the retaining plates 3 to be closely fitted with the inner ring assembly 2, and the third rail grooves 10 and the second rail grooves 9 on the retaining plates 3 can accurately form a rolling connection relationship with the corresponding first balls 6 and second balls 7. The arrangement of two retaining plates 3 can effectively prevent the first balls 6 and the second balls 7 from slipping out from both sides of the inner ring assembly 2, ensure the integrity and stability of the internal structure of the bearing, ensure that the bearing can work normally under the high-speed rotation or complex working conditions of the medical CT machine, and improve the reliability of the equipment operation.
[0046] The outer side of the convex disk 203 is in contact with the inner side of the retaining plate 3.
[0047] In specific implementation, the outer side of the convex disc 203 is in close contact with the inner side of the baffle 3. When the inner ring assembly 2 and the baffle 3 are installed, a stable matching relationship is formed between the convex disc 203 and the baffle 3 through reasonable positioning and installation methods, ensuring that the two will not be relatively displaced during the operation of the bearing. The close contact between the convex disc 203 and the baffle 3 can increase the connection stability between the inner ring assembly 2 and the baffle 3, help to transmit and disperse the axial force and radial force generated by the bearing during operation, improve the overall rigidity and impact resistance of the bearing, enable the medical CT machine to better cope with various external force interferences during operation, and ensure the safe and stable operation of the equipment.
[0048] The lower frame body 501 and the upper frame body 502 are both annular in shape and are both provided with arc grooves for clamping the contact ball 4 .
[0049] In specific implementation, when manufacturing the retainer 5, the lower frame body 501 and the upper frame body 502 are processed into an annular shape, and an arc groove for clamping the contact ball 4 is processed on the inner side thereof. When installing the contact ball 4, the contact ball 4 is placed in the arc groove, and then the lower frame body 501 and the upper frame body 502 are connected and fixed by the pin 503, so that the contact ball 4 can be stably retained inside the retainer 5. The design of the annular shape and the arc groove can better constrain the movement of the contact ball 4, so that it can be evenly distributed in the retainer 5, reduce the collision and friction between the contact balls 4, and ensure the smoothness and stability of the contact ball 4 when rolling and connecting with the first track groove 8 of the outer ring 1, thereby improving the rotation accuracy of the bearing and reducing noise, which is conducive to the medical CT machine to perform accurate scanning diagnosis in a quiet environment.
[0050] There are multiple pins 503 , and the multiple pins 503 are evenly distributed between the lower frame 501 and the upper frame 502 .
[0051] In specific implementation, during the manufacturing process of the holder 5, it is determined that the number of pins 503 to be used is multiple, and holes for installing the pins 503 are processed at corresponding positions on the lower frame 501 and the upper frame 502. When assembling the holder 5, multiple pins 503 are inserted into the holes at equal intervals to firmly connect the lower frame 501 and the upper frame 502 to ensure that the contact ball 4 will not loosen or fall off in the holder 5. Multiple equally distributed pins 503 can make the structure of the holder 5 more stable, enhance the support and restraint capabilities of the contact ball 4, ensure the stability of the contact ball 4 during high-speed rotation, reduce the additional friction and wear caused by the shaking of the contact ball 4, and extend the service life of the bearing. At the same time, it helps to maintain the stable operation of the rotating parts of the medical CT machine and improve the scanning imaging quality.
[0052] The lower inner ring 201 and the upper inner ring 202 are both annular in shape. The lower inner ring 201 is provided with a plurality of first screw holes, and the upper inner ring 202 is provided with a plurality of through holes corresponding to and cooperating with the first screw holes. The upper inner ring 202 and the lower inner ring 201 are connected and fixed by a plurality of stud bolts passing through the through holes and screwing into the first screw holes.
[0053] During specific implementation, when manufacturing the lower inner ring 201 and the upper inner ring 202, the lower inner ring 201 is processed into an annular shape and provided with a plurality of first screw holes, and through holes corresponding to the number, position, and specifications of the first screw holes are machined on the upper inner ring 202. When assembling the inner ring assembly 2, the upper inner ring 202 and the lower inner ring 201 are aligned so that the through holes correspond to the first screw holes, and then a plurality of stud bolts are used to sequentially pass through the through holes and screw into the first screw holes to tightly connect and fix the upper inner ring 202 and the lower inner ring 201. This connection method makes the structure of the inner ring assembly 2 more firm and reliable, capable of withstanding greater radial and axial loads. During the operation of the medical CT machine, it is ensured that the inner ring assembly 2 does not loosen or deform under high-speed rotation and complex stress conditions, guaranteeing the normal operation of the bearing, improving the stability and reliability of the rotation system of the medical CT machine, and providing stable support for accurate scanning.
[0054] The outer ring 1 is annular in shape, and a plurality of second screw holes are equidistantly arranged in a circumferential manner on both sides of the outer ring 1. A plurality of mounting holes are provided on the corresponding retaining plate 3. The retaining plate 3 and the outer ring 1 are connected and fixed by a plurality of stud bolts passing through the mounting holes and screwing into the second screw holes.
[0055] During specific implementation, when manufacturing the outer ring 1, it is processed into an annular shape, and a plurality of second screw holes are equidistantly arranged in a circumferential manner on both sides. When manufacturing the retaining plate 3, mounting holes are machined corresponding to the positions of the second screw holes on the outer ring 1. When installing the retaining plate 3 on the outer ring 1, a plurality of stud bolts are used to pass through the mounting holes of the retaining plate 3 and screw into the second screw holes of the outer ring 1 to firmly fix the retaining plate 3 on the outer ring 1. In this way, it can be ensured that the installation position of the retaining plate 3 on the outer ring 1 is accurate and stable, preventing the retaining plate 3 from shifting or loosening during the operation of the bearing, ensuring the normal rolling connection between the first ball 6 and the second ball 7 and the raceway groove, maintaining the stability of the internal structure of the bearing, and further ensuring that the medical CT machine does not malfunction due to the loosening of the bearing components during operation, improving the overall performance and safety of the equipment.
[0056] Finally, several points should be noted: First, in the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense, which can be mechanical connection or electrical connection, or the communication inside two components, and can be directly connected. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the described object changes, the relative position relationship may change;
[0057] Secondly: In the accompanying drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference may be made to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;
[0058] Finally: The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
Claims
1. A multi-point contact ball bearing for a medical CT machine, characterized in that, It includes an outer ring (1), an inner ring assembly (2), a retaining plate (3), contact balls (4), a cage (5), a first ball (6), a second ball (7), a first track groove (8), a second track groove (9) and a third track groove (10); the inner ring assembly (2) is arranged inside the outer ring (1), the inner ring assembly (2) includes a lower inner ring (201), an upper inner ring (202) and a convex disk (203), the lower inner ring (201) and the upper inner ring (202) are fixedly connected by studs, convex disks (203) are arranged on the outer sides of both the lower inner ring (201) and the upper inner ring (202), first ball grooves (204) and second ball grooves (205) are formed on the outer sides of both the lower inner ring (201) and the upper inner ring (202), the first ball grooves (204) and the second ball grooves (205) are respectively in rolling connection with the first ball (6) and the second ball (7), the first ball (6) and the second ball (7) are respectively arranged inside the third track groove (10) and the second track groove (9), the third track groove (10) and the second track groove (9) are formed on the inner side of the retaining plate (3), the contact balls (4) are arranged inside the cage (5), the cage (5) includes a lower frame body (501), an upper frame body (502) and pins (503), the lower frame body (501) and the upper frame body (502) are connected by the pins (503), the contact balls (4) are in rolling connection with the first track groove (8), and the first track groove (8) is formed on the inner side of the outer ring (1); An annular air passage (11) is formed inside the retaining plate (3), the annular air passage (11) is connected with an air injection passage (12), a plurality of exhaust ports (13) are equidistantly formed on the inner wall of the retaining plate (3), each of the exhaust ports (13) is inclined, and each of the exhaust ports (13) is communicated with the annular air passage (11).
2. The multi-point contact ball bearing of a medical CT machine according to claim 1, characterized in that, The number of the first balls (6) and the second balls (7) is multiple, and the multiple first balls (6) and the second balls (7) are respectively equidistantly distributed inside the first ball grooves (204) and the second ball grooves (205).
3. A multi-point contact ball bearing for a medical CT machine according to claim 1, characterized in that, The number of the contact balls (4) is multiple, and the multiple contact balls (4) are equidistantly distributed inside the cage (5).
4. A multi-point contact ball bearing for a medical CT machine according to claim 1, characterized in that, The number of the retaining plates (3) is two, and the two retaining plates (3) are respectively arranged on the outer sides of the lower inner ring (201) and the upper inner ring (202).
5. A multi-point contact ball bearing for a medical CT machine according to claim 1, characterized in that, The outer side of the convex disk (203) is in contact with the inner side of the retaining plate (3).
6. A multi-point contact ball bearing for a medical CT machine according to claim 1, characterized in that, The shapes of both the lower frame body (501) and the upper frame body (502) are annular, and arc grooves for clamping the contact balls (4) are formed on both of them.
7. A multi-point contact ball bearing for a medical CT machine according to claim 1, characterized in that, The number of the pins (503) is multiple, and the multiple pins (503) are equidistantly distributed between the lower frame body (501) and the upper frame body (502).
8. A multi-point contact ball bearing for a medical CT machine according to claim 1, characterized in that, The shapes of both the lower inner ring (201) and the upper inner ring (202) are annular, the lower inner ring (201) is provided with a plurality of first screw holes, the upper inner ring (202) is provided with a plurality of through holes corresponding to and cooperating with the first screw holes, and the upper inner ring (202) and the lower inner ring (201) are fixedly connected by a plurality of studs passing through the through holes and the first screw holes.
9. A multi-point contact ball bearing for a medical CT machine according to claim 1, characterized in that, The outer ring (1) is in a ring shape, and a plurality of second screw holes are equidistantly arranged in a circumferential manner on both sides of the outer ring (1). Corresponding mounting holes are formed in the retaining plate (3), and the retaining plate (3) and the outer ring (1) are fixedly connected by a plurality of stud bolts passing through the mounting holes and the second screw holes.