CN218509953U

CN218509953U - Double-row angular contact ball bearing for spiral CT machine

Info

Publication number: CN218509953U
Application number: CN202222992316.6U
Authority: CN
Inventors: 李俊强; 马涛; 左朋辉; 张芳; 袁航; 王远; 李淑珍
Original assignee: China Machinery Luoyang Equipment Technology Co ltd
Current assignee: China Machinery Luoyang Equipment Technology Co ltd
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-02-21
Anticipated expiration: 2032-11-10

Abstract

The utility model discloses a double-row angular contact ball bearing for a spiral CT machine, which comprises an outer ring, a second outer ring, an inner ring and two rows of steel balls positioned between the outer ring and the inner ring; the second outer ring is sleeved at the lower part of the inner side of the outer ring; an elastic cylindrical pin is arranged in an end face of the intersection of the inner diameter face of the outer ring and the outer diameter face of the second outer ring through a perforation; the steel balls are fixed through a retainer; an oil cup for filling lubricating grease is also communicated with the inner side of the inner ring; an installation through hole is formed in the inner ring reference end face at the top of the inner ring; the inner ring reference end face is also provided with a threaded blind hole for hoisting; and double semicircular arc grooves matched with the outer diameter of the steel ball are arranged on the upper side and the lower side of the outer diameter surface of the inner ring. The utility model discloses a structure of outer lane, second outer lane, inner circle, steel ball and holder can solve the technical problem that prior art noise is big, the reliability is low, life is short.

Description

Double-row angular contact ball bearing for spiral CT machine

Technical Field

The utility model belongs to the technical field of the bearing, mainly relate to a double row angular contact ball bearing for spiral CT machine.

Background

The spiral CT machine effectively scans a certain thickness layer of a specified part of a human body through an X-ray beam, and is important medical mechanical equipment for clinical diagnosis. When the helical CT machine is used for scanning, circular motion is required to realize helical scanning; the main bearing of the spiral CT machine is a key part of a rotary scanning part of the CT machine, the bearing is vertically arranged when used, an inner ring rotates, and the bearing mainly bears radial force and micro tipping moment; in the rotatory in-process of scanning component, bearing self causes the local atress of bearing inner wall inhomogeneous because of receiving the pressure of scanning component dead weight, easily forms the damage in the different degree, can lead to bearing assembly firmness to reduce simultaneously, brings the running noise for spiral CT machine, has not only reduced the reliability of machine and the life of machine but also great running noise influences patient's diagnosis quality.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a double row angular contact ball bearing for spiral CT machine to solve the technical problem that prior art noise is big, the reliability is low, life is short.

For realizing the purpose of the utility model, the adopted technical proposal is as follows:

a double-row angular contact ball bearing for a spiral CT machine comprises an outer ring, a second outer ring, an inner ring and two rows of steel balls positioned between the outer ring and the inner ring; the second outer ring is sleeved at the lower part of the inner side of the outer ring; an elastic cylindrical pin is arranged in an end face of the intersection of the inner diameter face of the outer ring and the outer diameter face of the second outer ring through a perforation; the steel balls are fixed through a retainer; an oil cup for filling lubricating grease is also communicated with the inner side of the inner ring; an installation through hole is formed in the inner ring reference end face at the top of the inner ring; the inner ring reference end face is also provided with a threaded blind hole C for hoisting; the upper side and the lower side of the outer diameter surface of the inner ring are provided with double semicircular arc grooves matched with the outer diameter of the steel ball; a grease injection hole for filling lubricating grease is formed in the inner diameter of the inner ring; the grease injection hole is communicated with the oil cup.

An outer diameter spigot is arranged on the outer side small end face of the lower part of the outer ring, and a threaded blind hole A for hoisting is also arranged on the outer side small end face; a plurality of mounting counter bores which are uniformly distributed along the circumferential direction are arranged on the circumferential large end surface A at the top of the outer ring; an internal thread is arranged on the large inner diameter A of the inner side of the lower part of the outer ring, and a semicircular arc channel A is arranged on the second inner diameter of the inner side of the upper part of the outer ring; meanwhile, a small inner diameter step A is also arranged at the inner diameter of the outer ring.

The outer diameter of the second outer ring is provided with an external thread; a semicircular arc groove B is formed in the large inner diameter of the second outer ring on the inner side of the upper part of the second outer ring; a small inner diameter step B is arranged at the inner diameter of the second outer ring; and threaded blind holes B uniformly distributed along the circumference are formed in the bottom big end face B of the second outer ring.

The internal thread on the outer ring is the same as the external thread on the second outer ring in tooth shape, and the pitch diameter of the threads is the same and matched with each other.

The retainer is of an integral strip nylon structure, a pocket of the retainer is in the shape of an inner spherical surface, and the curvature of the inner spherical surface is larger than the radius of the steel ball; the pocket hole is set into a trapezoidal boss structure on two sides after extending.

The semicircular arc channel of the outer ring, the semicircular arc channel of the second outer ring and the double semicircular arc channels of the inner ring all adopt large-groove curvature coefficients.

The contact angle of the steel ball is set to be 30 degrees.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. by adopting the thread connection structure matched and processed between the outer ring and the second outer ring, the steel ball can be arranged in the inner ring channel and then screwed into the second outer ring without arranging a ball plug hole, thereby avoiding the influence of the unevenness of the joint of the plug hole and the channel on the high-speed performance of the bearing.

2. By adopting the large groove curvature coefficient of the inner ring and the outer ring, the contact arc between the bearing steel ball and the groove is shortened after the bearing bears the weight, the range of sliding friction is shortened, and the generated vibration and noise value are reduced.

3. The retainer is of an integral strip nylon structure, so that vibration and impact caused by unbalanced mass center of the retainer during bearing operation are reduced, the stability of the bearing during high-speed operation is better adapted and improved, and the overall stability of the bearing is improved.

4. The small inner diameter steps arranged at the inner diameters of the outer ring and the second outer ring and a relatively closed space formed between the two semi-circular arc channels. The structure has a limiting effect on lubricating grease when the bearing inner ring rotates at a high speed, so that the loss of the lubricating grease in the working process can be effectively reduced, and the service life of the bearing is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the structure of the outer ring in fig. 1.

Fig. 3 is a schematic view of the structure of the second outer ring in fig. 1.

Fig. 4 is a schematic view of the inner ring of fig. 1.

Fig. 5 is a schematic view of the structure of the retainer of fig. 1.

In the figure: 1. an outer ring; 2. a second outer race; 3. a steel ball; 4. an inner ring; 5. a holder; 6. an elastic cylindrical pin; 7. an oil cup; 9. an outer diameter spigot; 10. a small end face; 11. a threaded blind hole A; 12. a large end face A; 13. mounting a counter bore; 14. a large inner diameter A; 15. an internal thread; 16. a second inner diameter; 17. a semicircular arc channel A; 18. a small inner diameter step A; 19. an external thread; 20. the second outer ring has a large inner diameter; 21. a semi-circular arc channel B; 22. a small inner diameter step B; 23. a large end face B; 24. a threaded blind hole B; 25. an inner ring reference end face; 26. a threaded blind hole C; 27. mounting a through hole; 29. double semicircular arc channels; 30. an inner diameter; 31. a grease injection hole; 32. a pocket hole; 33. trapezoidal boss.

Detailed Description

The present invention will be described with reference to the accompanying drawings.

As shown in fig. 1-5, the double-row angular contact ball bearing for the spiral CT machine comprises an outer ring 1, a second outer ring 2, an inner ring 4 and two rows of steel balls 3 located between the outer ring 1 and the inner ring 2; the second outer ring 2 is sleeved at the lower part of the inner side of the outer ring 1; an elastic cylindrical pin 6 is arranged in the end face of the intersection of the inner diameter surface of the outer ring 1 and the outer diameter surface of the second outer ring 2 through a hole; the steel balls are fixed through a retainer 5; and an oil cup 7 for filling lubricating grease is also communicated with the inner side of the inner ring 4. An installation through hole 27 is formed in the inner ring reference end face 25 at the top of the inner ring 4; the inner ring reference end face 25 is also provided with a threaded blind hole C26 for hoisting; the upper side and the lower side of the outer diameter surface of the inner ring 4 are provided with double semicircular arc grooves 29 matched with the outer diameter of the steel ball 3; a grease injection hole 31 for filling lubricating grease is formed in the inner diameter 30 of the inner ring; the grease filling hole 31 is communicated with the oil cup 7. The semi-circular arc channel A17 of the outer ring 1, the semi-circular arc channel B21 of the second outer ring and the double semi-circular arc channels 29 of the inner ring 4 all adopt large-groove curvature coefficients. The inner ring and the outer ring adopt large groove curvature coefficients, contact arcs of the bearing steel balls 3 and the grooves are shortened after the bearing bears the load, the range of sliding friction is shortened, and the generated vibration and noise values are reduced. In addition, as the large-groove curvature coefficient is selected, more lubricating grease is stored in the effective lubricating space of the bearing groove, so that the vibration and noise reduction are facilitated, and the use working condition of the bearing with high speed, light load and low noise is better adapted. The contact angle of the steel ball 3 is set to be 30 degrees, and the preferred contact angle of the steel ball 3 is a contact angle of 30 degrees, so that the bearing is more suitable for the use condition that the bearing mainly bears radial force and micro tilting moment.

An outer diameter spigot 9 is arranged on an outer side small end face 10 at the lower part of the outer ring 1, and a threaded blind hole A11 for hoisting is also arranged on the outer side small end face 10; a plurality of mounting counter bores 13 which are uniformly distributed along the circumferential direction are arranged on a circumferential large end surface A12 at the top of the outer ring 1; an internal thread 15 is arranged on a large inner diameter A14 on the inner side of the lower part of the outer ring 1, and a semicircular arc channel A17 is arranged on a second inner diameter 16 on the inner side of the upper part of the outer ring 1; meanwhile, a small inner diameter step A18 is arranged at the inner diameter of the outer ring 1. The outer diameter of the second outer ring 2 is provided with an external thread 19; a semicircular arc channel B21 is arranged on the large inner diameter 20 of the second outer ring at the inner side of the upper part of the second outer ring 2; a small inner diameter step B22 is arranged at the inner diameter of the second outer ring 2; threaded blind holes B24 which are uniformly distributed along the circumference are formed in the large end face B23 at the bottom of the second outer ring 2; the thread blind hole B24 can uniformly apply force to the second outer ring 2 through the thread hole when the thread is screwed, so that the thread is not randomly buckled when the thread is screwed; a relatively closed space is formed between the small inner diameter step A18 of the outer ring 1, the small inner diameter step B22 of the second outer ring 2 and the two half arc channels; the structure has a limiting effect on lubricating grease when the bearing inner ring rotates at a high speed, so that the loss of the lubricating grease in the working process can be effectively reduced, and the service life of the bearing is prolonged. The internal thread 15 on the outer ring 1 and the external thread 19 on the second outer ring 2 have the same tooth form and the same thread pitch diameter size and are matched with each other, so that the two can be completely screwed; the outer ring 1 and the second outer ring 2 are matched with a processed thread connecting structure, the steel ball 3 can be arranged in an inner ring channel and then screwed into the second outer ring 2, a ball plug hole is not required to be arranged, and the influence of the unevenness of the joint of the plug hole and the channel on the high-speed performance of the bearing is avoided; meanwhile, the structure of the thread connection can also control the axial clearance value of the bearing by adjusting the thread screwing depth of the second outer ring 2, and the elastic pin placed after the inner thread and outer thread connection end face is punched avoids thread jumping and random buckling in the process of bearing transportation and use.

The retainer 5 is of an integral strip-shaped nylon structure, and the retainer pocket 32 is shaped like an inner spherical surface, and the curvature of the inner spherical surface is larger than the radius of the steel ball; the pockets 32 are extended and then are arranged into trapezoidal boss 33 structures at two sides; the retainer 5 is a nylon retainer, has lighter weight compared with a copper retainer and a steel retainer, reduces vibration and impact generated by unbalance of the center of mass of the retainer when the bearing operates, and better adapts to and improves the stability of the bearing during high-speed operation; the contact area between the pockets of the strip-shaped nylon retainer 5 and the steel balls 3 is small, and the inner pockets of the retainer 5 and the inner spherical surfaces formed by extending the trapezoid bosses at the two sides lock the steel balls 3 and can ensure that the steel balls rotate smoothly in a friction mode; meanwhile, the selected strip-shaped nylon retainer has strong plasticity of the material, so that the noise generated by mutual impact between the steel ball and the retainer and between the retainer and the inner ring and the outer ring when the bearing rotates at a high speed is effectively reduced; in addition, compared with a copper or steel retainer, the selected nylon retainer has low cost and excellent economical efficiency.

Above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.

Claims

1. A double-row angular contact ball bearing for a spiral CT machine comprises an outer ring (1), a second outer ring (2), an inner ring (4) and two rows of steel balls (3) positioned between the outer ring (1) and the inner ring (4); the method is characterized in that: the second outer ring (2) is sleeved at the lower part of the inner side of the outer ring (1); an elastic cylindrical pin (6) is arranged in the end face of the intersection of the inner diameter surface of the outer ring (1) and the outer diameter surface of the second outer ring (2) through a perforation; the steel balls (3) are fixed through a retainer (5); an oil cup (7) for filling lubricating grease is also communicated with the inner side of the inner ring (4); an installation through hole (27) is formed in the inner ring reference end face (25) at the top of the inner ring (4); a threaded blind hole C (26) for hoisting is further formed in the reference end face of the inner ring (4); the upper side and the lower side of the outer diameter surface of the inner ring (4) are provided with double semicircular arc grooves (29) matched with the outer diameter of the steel ball (3); a grease injection hole (31) for filling lubricating grease is formed in the inner diameter (30) of the inner ring; the grease injection hole (31) is communicated with the oil cup (7).

2. The double row angular contact ball bearing for spiral CT machine of claim 1, wherein: an outer diameter spigot (9) is arranged on an outer side small end face (10) at the lower part of the outer ring (1), and a threaded blind hole A (11) for hoisting is further arranged on the outer side small end face (10); a plurality of mounting counter bores (13) which are uniformly distributed along the circumferential direction are arranged on the circumferential large end surface A (12) at the top of the outer ring (1); an internal thread (15) is arranged on a large inner diameter A (14) on the inner side of the lower part of the outer ring (1), and a semicircular arc channel A (17) is arranged on a second inner diameter (16) on the inner side of the upper part of the outer ring (1); meanwhile, a small inner diameter step A (18) is also arranged at the inner diameter of the outer ring (1).

3. The double row angular contact ball bearing for spiral CT machine of claim 1, wherein: the outer diameter of the second outer ring (2) is provided with an external thread (19); a semi-circular arc channel B (21) is arranged on the large inner diameter (20) of the second outer ring on the inner side of the upper part of the second outer ring (2); a small inner diameter step B (22) is arranged at the inner diameter of the second outer ring (2); and threaded blind holes B (24) uniformly distributed along the circumference are formed in the bottom big end surface B (23) of the second outer ring (2).

4. The double row angular contact ball bearing for spiral CT machine of claim 3, wherein: the internal thread on the outer ring (1) is the same as the external thread on the second outer ring (2) in tooth form, and the pitch diameters of the threads are the same and are mutually matched.

5. The double row angular contact ball bearing for spiral CT machine of claim 1, wherein: the retainer (5) is of an integral strip nylon structure, a pocket (32) of the retainer (5) is shaped like an inner spherical surface, and the curvature of the inner spherical surface is larger than the radius of the steel ball (3); the pockets (32) are arranged into structures of trapezoidal bosses (33) on two sides after extending.

6. The double row angular contact ball bearing for spiral CT machine of claim 2 or 3, wherein: the semi-circular arc channel A (17) of the outer ring (1), the semi-circular arc channel B (21) of the second outer ring (2) and the double semi-circular arc channels (29) of the inner ring (4) are all large-groove curvature coefficients.

7. The double row angular contact ball bearing for spiral CT machine of claim 1, wherein: the angle of the contact angle of the steel ball (3) is set to be 30 degrees.