Self-lubricating ball bearing

Abstract

The invention provides a self-lubricating ball bearing. The self-lubricating ball bearing comprises an outer ferrule, a rolling body, a lubricating block and an inner ferrule, the outer sleeve ring coaxially sleeves the peripheral side of the inner sleeve ring, and a rolling body is arranged between the outer sleeve ring and the inner sleeve ring; the outer ferrule and / or the inner ferrule are / is of a double-half structure, lubricating blocks are installed on the outer ferrule and / or the inner ferrule of the double-half structure, and the rolling bodies make contact with the lubricating blocks. The outer sleeve ring or the inner sleeve ring of the double-half structure is adopted to be matched with the lubricating block, a retainer does not need to be installed, full ball filling is achieved, the bearing capacity of the bearing is improved, meanwhile, the conditions of performance degradation or function loss such as retainer fragmentation in the high-temperature environment of a reactor are avoided, the reliability of the bearing is improved, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of bearing structures, in particular to a self-lubricating ball bearing. Background Art

[0002] Affected by the high temperature, high pressure and irradiation environment of the reactor, the bearing materials and structures have different design focuses from non-nuclear grade bearings. In the supporting shaft system of equipment such as the reactor drive device, the bearing is in direct contact with the reactor medium (water, lead bismuth or inert gas, etc.), and often does not have the conditions for adding lubricating oil or grease, which makes the bearing rolling elements and the inner and outer rings in a dry friction state; intermittent impact and frequent start-stop conditions produce high intermittent radial and axial loads on the bearings, further accelerating the failure of the bearings; for scenarios where it is difficult to replace or not to replace, the fatigue life and wear life of the bearings will be severely tested; the high temperature environment of the reactor affects the mechanical properties of the bearing materials and the running clearance of the bearings. Under the action of strong radiation, the performance of some materials (especially the cage) will be greatly attenuated over time, further leading to deformation and fracture. Summary of the invention

[0003] In view of the defects in the prior art, an object of the present invention is to provide a self-lubricating ball bearing.

[0004] A self-lubricating ball bearing provided according to the present invention comprises: an outer ring, a rolling element, a lubricating block and an inner ring;

[0005] The outer ring is coaxially sleeved on the outer circumference of the inner ring, and a rolling body is arranged between the outer ring and the inner ring;

[0006] The outer ring and / or the inner ring are configured as a double-half structure, a lubricating block is installed on the outer ring and / or the inner ring of the double-half structure, and the rolling body contacts the lubricating block.

[0007] Preferably, the double half structure comprises: a left half circle and a right half circle;

[0008] The left half circle is connected to the right half circle to form the outer ring or the inner ring, and the lubrication block is installed between the left half circle and the right half circle.

[0009] Preferably, the left half circle, the right half circle and the lubricating block are fixedly connected along the axial direction by rivets.

[0010] Preferably, an arc-shaped raceway for rolling of rolling elements is provided on the inner side of the outer raceway and the outer side of the inner raceway, and a surface strengthening layer may be provided on the raceway surface as required, the strengthening layer having a thickness of not less than 1 mm and being metallurgically bonded with the outer raceway or the inner raceway;

[0011] The good compatibility of the strengthening layer with the outer ring or the inner ring can further improve the overall performance of the bearing, that is, achieve a reasonable matching path of impact resistance and wear resistance.

[0012] Preferably, the rolling body is configured as a sphere and adopts a full-ball structure.

[0013] Preferably, the left half circle and the right half circle are symmetrical structures.

[0014] Preferably, the left half circle and the right half circle are asymmetric structures, and the distribution ratio of the left half circle and the right half circle to the arc of the arc raceway is 0.2-0.8.

[0015] Preferably, the radius of the arc-shaped raceway is larger than that of the rolling body, and the contact between the arc-shaped raceway and the rolling body is point contact.

[0016] Preferably, the rolling element surface is coated with a strengthening film, typically a carbon film, a tungsten disulfide film, etc., which can be prepared on the target surface, and the lubricating block is made of a layered material with solid lubrication properties such as graphite or carbon fiber reinforced carbon.

[0017] Preferably, grooves for mounting lubrication blocks are arranged at intervals on the arc-shaped raceways of the left half circle and the right half circle.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present application adopts a double-half structure outer ring or inner ring with a lubricating block, and does not require the installation of a cage, so as to achieve full ball loading, which not only improves the bearing's load capacity, but also avoids the occurrence of cage fragmentation and other performance degradation or function loss in the high temperature environment of the reactor, thereby improving the reliability and service life of the bearing;

[0020] 2. The rolling element of the present application adopts a full ball structure, which improves the bearing capacity of the bearing;

[0021] 3. The present application adopts a lubrication block, which can achieve lubrication of rolling elements and raceways in the medium and long term, optimize the contact state, extend the service life, and has excellent high temperature resistance, wear resistance, corrosion resistance, self-lubrication, long life and other characteristics. It solves the problem that the dry friction state between the rolling elements and the inner and outer rings affects the wear life of the bearing without adding lubricating oil or grease. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 It is a schematic diagram of the cross section of a self-lubricating ball bearing;

[0024] Figure 2 It is a schematic diagram of the overall structure of a self-lubricating ball bearing;

[0025] Figure 3 It is a half-section view of a self-lubricating ball bearing;

[0026] Figure 4 Exploded view of a self-lubricating ball bearing;

[0027] Figure 5 It is the rolling body point contact mode 1;

[0028] Figure 6 It is the second rolling element point contact mode;

[0029] As shown in the figure:

[0030] DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0032] Example 1

[0033] The self-lubricating ball bearing of this embodiment can withstand the harsh working environment of the reactor. The full ball structure greatly enhances the bearing capacity. At the same time, the lubricating block 3 provides a self-lubricating function, optimizes the contact state, and extends the service life. It has excellent high temperature resistance, wear resistance, corrosion resistance, self-lubrication, long life and other characteristics.

[0034] like Figure 1-2 As shown, this embodiment includes: an outer ring 1, rolling elements 2, a lubricating block 3, a rivet 4 and an inner ring 5; the outer ring 1 and the inner ring 5 are arranged as an annular structure, the outer ring 1 is coaxially sleeved on the outer peripheral side of the inner ring 5, and the rolling elements 2 are arranged between the outer ring 1 and the inner ring 5; the outer ring 1 and / or the inner ring 5 are arranged as a double-half structure, the lubricating block 3 is installed on the outer ring 1 and / or the inner ring 5 of the double-half structure, and the rolling elements 2 contact the lubricating block 3.

[0035] Combination Figure 4 As shown, the double half structure includes: a left half circle and a right half circle; the left half circle is connected to the right half circle to form an outer ring 1 or an inner ring 5, and grooves for installing lubricating blocks 3 are arranged at intervals on the arc-shaped raceways of the left half circle and the right half circle, so that the lubricating blocks 3 are evenly arranged in multiple sections to prevent the full ring-shaped lubricating blocks 3 from affecting the structural strength of the double half structure outer ring 1 or the inner ring 5. The left half circle, the right half circle and the lubricating block 3 are fixedly connected along the axial direction by rivets 4.

[0036] The inner side of the outer ring 1 and the outer side of the inner ring 5 are provided with an arc-shaped raceway for rolling of the rolling element 2. The raceway surface is provided with a surface strengthening layer. The thickness of the surface strengthening layer should be effectively controlled. The thickness of the strengthening layer is not less than 1mm, so that it does not affect the rebound characteristics of the inner and outer ring substrates and provides extremely high surface hardness. The radius of the arc-shaped raceway is larger than the rolling element 2, and the contact form between the arc-shaped raceway and the rolling element 2 is point contact.

[0037] In one embodiment, Figure 3 As shown, the rolling body 2 is configured as a sphere and adopts a full-ball structure. The full-ball structure means that no barrier structure such as a retaining frame is provided between the rolling bodies 2, and multiple rolling bodies 2 are in a state of covering the raceway.

[0038] In one embodiment, the outer ring 1 and the inner ring 5 are preferably made of non-magnetic steel, the rolling element 2 is a non-magnetic steel ball, and the rolling element 2 is plated with a carbon film, which is plated on the surface of the rolling element 2 using a surface PVD coating process. The rolling element 2 is made of wear-resistant material, has high wear resistance and oxidation resistance at room temperature and high temperature of 350°C, and is made of high-temperature nickel-based alloy or high-temperature cobalt-based alloy in this embodiment.

[0039] In one embodiment, the lubricating block 3 is made of a layered structure material such as graphite, carbon fiber reinforced carbon, etc.

[0040] In one embodiment, the left half circle and the right half circle are symmetrical structures.

[0041] In one embodiment, Figure 5-6 As shown, the rolling element 2 and the arc-shaped raceways of the inner and outer rings are in three-point contact, four-point contact or other multi-point contact as a whole.

[0042] In another embodiment, the left half circle and the right half circle are asymmetrical structures, and the distribution ratio of the left half circle and the right half circle to the arc of the arc raceway is 0.2-0.8.

[0043] Example 2

[0044] Example 2 is a preferred example of Example 1.

[0045] like Figure 1-3 As shown, this embodiment includes: an outer ring 1, an inner ring 5, and a rolling element 2, wherein the inner ring 5 includes a left inner ring 51, a right inner ring 52, a lubricating block 3, a rivet 4, etc. The outer ring 1 contains a row of arc-shaped raceways; the left inner ring 51 and the right inner ring 52 are double-half structures, each containing an arc-shaped raceway, and the two halves of the inner ring are symmetrical in structure, and the lubricating block 3 is clamped and fixed in the middle through end face positioning and connection with rivets 4, and together form a complete inner ring 5; the rolling element 2 is a sphere, installed between the raceways of the outer ring 1 and the inner ring 5.

[0046] Combination Figure 4 As shown, the outer ring 1 is made of a forged metal material and is forged into a tubular blank. Its outer dimensions should completely envelop the outer shape of the outer ring 1 of the bearing to ensure that there is enough material removal margin in the process from the blank to the finished product. The inner ring is made of a forged metal material and is forged into a tubular blank. Its outer dimensions should completely envelop the outer shapes of the left inner ring 51 and the right inner ring 52 of the bearing to ensure that there is enough material removal margin in the process from the blank to the finished product; further, the left inner ring 51 and the right inner ring 52 are two parts coupled to each other, and their main coupling point is at the contact point with the rolling element 2 to ensure the relative position of the arc raceway of the left inner ring 51 and the right inner ring 52; in another embodiment, the left inner ring 51 and the right inner ring 52 can be modified to an asymmetric arrangement, that is, the distribution ratio of the arc can be adjusted to between 0.2-0.8, which is specifically determined by the position of the contact point.

[0047] The lubricating block 3 is made of graphite, carbon fiber reinforced carbon and other materials with solid lubrication properties, and is prepared by mixing the main body and the lubricating component. Its structure can be layered or solidified after mixing. The lubricating block 3 is evenly distributed between the inner rings 5 ​​to form an initial contact with the rolling element 2. The lubricating block 3 can be prepared by cutting a solid ring into a uniform block, installed between the inner rings 5, and fixed by rivets 4 passing through the holes of the lubricating block 3. Furthermore, the middle of each lubricating block 3 should be higher than the original arc surface to form an initial contact with the rolling element 2 to ensure lubrication.

[0048] like Figure 5-6 As shown, the rolling body 2 is a spherical body with extremely high precision. It is formed by grinding the ball blank with a ball grinding device to form a rolling bearing body with consistent size, which cooperates with the outer ring 1, the inner ring 5, and the lubricating block 3. The contact points of the rolling body 2 with the outer ring 1 can be 1 point or 2 points, the contact points with the inner ring can be 1 point or 2 points, and the contact point with the lubricating block 3 is 1 point. During long-term operation, the rolling body 2 is in stable contact with the outer ring 1 and the inner ring 5, and is in random contact with the lubricating layer 2 and forced contact after wear.

[0049] The rivet 4 is a fastener connecting the left inner ring 51 and the right inner ring 52. It passes through the left inner ring 51, the lubricating block 3, and the right inner ring 52 in sequence to connect the three together, and further forms a rolling fit with the outer ring 1 through the rolling body 2 to form a bearing.

[0050] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A self-lubricating ball bearing, characterized in that: include: An outer ring (1), a rolling element (2), a lubricating block (3) and an inner ring (5); The outer ring (1) is coaxially sleeved on the outer circumference of the inner ring (5), and a rolling body (2) is arranged between the outer ring (1) and the inner ring (5); The outer ring (1) and / or the inner ring (5) are configured as a double-half structure, a lubricating block (3) is installed on the outer ring (1) and / or the inner ring (5) of the double-half structure, and the rolling element (2) contacts the lubricating block (3).

2. The self-lubricating ball bearing according to claim 2, characterized in that: The double half structure comprises: a left half circle and a right half circle; The left half circle is connected to the right half circle to form the outer ring (1) or the inner ring (5), and the lubricating block (3) is installed between the left half circle and the right half circle.

3. The self-lubricating ball bearing according to claim 2, characterized in that: The left half circle, the right half circle and the lubricating block (3) are fixedly connected along the axial direction by rivets (4).

4. The self-lubricating ball bearing according to claim 2, characterized in that: The inner side of the outer ring (1) and the outer side of the inner ring (5) are provided with arc-shaped raceways for rolling of the rolling bodies (2), and the surface of the raceways is provided with a surface strengthening layer.

5. The self-lubricating ball bearing according to claim 1, characterized in that: The rolling body (2) is configured as a sphere and adopts a full-ball structure.

6. The self-lubricating ball bearing according to claim 3, characterized in that: The left half circle and the right half circle are symmetrical structures.

7. The self-lubricating ball bearing according to claim 4, characterized in that: The left half circle and the right half circle are asymmetrical structures, and the distribution ratio of the left half circle and the right half circle to the arc of the arc raceway is 0.2-0.

8.

8. The self-lubricating ball bearing according to claim 4, characterized in that: The radius of the arc-shaped rolling track is greater than that of the rolling body (2), and the contact form between the arc-shaped rolling track and the rolling body (2) is point contact.

9. The self-lubricating ball bearing according to claim 1, characterized in that: The surface of the rolling body (2) is coated with a strengthening film, and the lubricating block (3) is made of a solid lubricating material.

10. The self-lubricating ball bearing according to claim 2, characterized in that: Grooves for installing lubricating blocks (3) are arranged at intervals on the arc-shaped raceways of the left half circle and the right half circle.

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