Self-lubricating ultralow-temperature angular contact ball bearing

Abstract

A self-lubricating ultralow-temperature angular contact ball bearing belongs to the technical field of bearings and comprises a stainless steel outer sleeve and a stainless steel inner sleeve. A contact angle is arranged on one side of the inner side of the stainless steel outer sleeve and ranges from 14 degrees to 16 degrees. The silicon nitride ceramic ball bearing is characterized by further comprising a plurality of silicon nitride ceramic balls and a polyimide resin retainer, the polyimide resin retainer adopts an inner guide mode and has a self-lubricating function, an inner ring of the polyimide resin retainer is arranged at a position close to the stainless steel inner sleeve, and the inner ring of the polyimide resin retainer is in clearance fit with the outer edge of the stainless steel inner sleeve; the stainless steel inner sleeve is a rotary sleeve ring and provides dragging torque for the rolling body during rotation; a slope angle is arranged on one side of the inner side of the stainless steel outer sleeve, the slope angle ranges from 2.75 degrees to 3.25 degrees, and the slope and the groove bottom of the sleeve ring form a ball loading locking amount. The utility model has the advantages that: when working at an ultra-low temperature, the valve is not easy to wear, and the service life is prolonged.

Description

Technical Field

[0001] The utility model discloses a ball bearing, in particular to a self-lubricating ultra-low temperature angular contact ball bearing, belonging to the technical field of bearings. Background Art

[0002] The advancement of science and technology has expanded the ability of human beings to enter extreme areas. People are constantly entering harsh environments such as extreme cold, high temperature, and corrosion through equipment and facilities. Bearings are key components that are indispensable for these equipment and facilities to achieve their intended functions.

[0003] In some special applications, such as liquid nitrogen (hydrogen, oxygen) pumps, butane pumps, liquid pumps for rockets and missiles and other liquid pumps, the transmission bearings are required to work at ultra-low temperatures, that is, the working temperature is lower than -60°C, and in some cases the working temperature is close to -196°C. Most ultra-low temperature bearings need to be equipped with independent lubrication systems or liquid lubrication media to ensure that the bearings have a lower friction coefficient in ultra-low temperature environments, reduce the friction between bearing components, and keep the bearings hard for a long service life. However, in some special occasions, due to the limitations of component space and weight, it is impossible to configure a lubrication system. Traditional grease will solidify and lose its lubricating effect at ultra-low temperatures. This requires a special lubrication method to ensure that the bearings have appropriate lubrication when working and obtain an appropriate service life. Utility Model Content

[0004] The utility model aims to provide a self-lubricating ultra-low temperature angular contact ball bearing, which is suitable for working under ultra-low temperature, such as liquid oxygen pumps and the like.

[0005] The purpose of the utility model is to provide a self-lubricating ultra-low temperature angular contact ball bearing in view of the defects in the prior art of the above-mentioned ball bearings, such as easy wear and reduced service life when working at ultra-low temperatures, which can achieve the purpose of not being easily worn and extending the service life when working at ultra-low temperatures.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is: a self-lubricating ultra-low temperature angular contact ball bearing, which is a high-precision ultra-low temperature self-lubricating bearing, including a stainless steel outer sleeve and a stainless steel inner sleeve; a contact angle is provided on the inner side of the stainless steel outer sleeve, and the contact angle is 14-16°, which can withstand a certain axial load force and enable the bearing to have a higher speed performance;

[0007] Also included are a number of silicon nitride ceramic balls and a polyimide resin cage;

[0008] The polyimide resin cage is an inner-guiding cage with self-lubricating function. The inner ring of the polyimide resin cage is arranged near the stainless steel inner sleeve. The inner ring of the polyimide resin cage and the outer edge of the stainless steel inner sleeve are clearance-matched. The stainless steel inner sleeve is a rotating ring, which provides rolling elements with drag torque when rotating.

[0009] When the bearing rotates, the polyimide at the inner end of the polyimide resin cage is easily transferred and attached to the silicon nitride ceramic ball and the stainless steel inner sleeve raceway surface to form a lubricating film, which reduces the friction and wear of the bearing components and keeps the bearing in suitable service life at ultra-low temperatures.

[0010] A slope angle is arranged on one side of the inner side of the stainless steel outer sleeve, and the slope angle is 2.75-3.25 degrees. The slope and the groove bottom of the ferrule form a ball loading lock, which is conducive to ball loading and does not damage the ball during loading.

[0011] The outer diameter of the bearing outer sleeve is 15mm, the inner diameter of the bearing inner sleeve is 10mm, and the bearing width is 3mm; the diameter of the silicon nitride ceramic balls is 1.2mm, and there are 12 of them. The silicon nitride ceramic balls are separated by a retaining frame and evenly arranged in the raceway between the bearing outer sleeve and the bearing inner sleeve. The above dimensions can vary within a certain range as needed.

[0012] The self-lubricating ultra-low temperature ball bearing has an operating temperature of -196 to 55°C and an operating speed of 6000 to 7000 r / min. The operating temperature and operating speed can be varied within a certain range as required.

[0013] The contact angle is 15°; the slope angle is 3°, and the arc raceway height on one side of the slope angle of the stainless steel jacket, that is, the ball locking amount, is 0.04 mm.

[0014] The polyimide resin retainer is annular in structure, the pockets of the polyimide resin retainer are arranged in an even number, 12 spherical pockets are evenly distributed on the outer surface, and 12 silicon nitride ceramic balls are arranged in the spherical pockets in a one-to-one correspondence.

[0015] The cage is made of polyimide as the main raw material. When the bearing rotates, the cage material adheres to the silicon nitride ceramic ball and the raceway surface of the ring in sequence to form a lubricating film.

[0016] The material of the silicon nitride ceramic ball is silicon nitride ceramic material (Si3N4). The silicon nitride ceramic ball has the advantages of high hardness, good wear resistance, small expansion coefficient under low temperature conditions, and no oxidation, and is suitable for working in ultra-low temperature environment.

[0017] The bearing outer sleeve and inner sleeve are made of G102 Cr 18Mo stainless steel.

[0018] The utility model is also suitable for deep groove ball bearings and meets the requirements of ultra-low temperature self-lubrication.

[0019] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model adopts an internal guiding method and has a self-lubricating retainer, is a self-lubricating ultra-low temperature angular contact ball bearing, can work at an ultra-low temperature of -196°C, is not easy to wear, and has a prolonged service life; meets the application requirements of ball bearings in ultra-low temperature self-lubricating working environments, and is also suitable for the application requirements of ultra-low temperature self-lubricating angular contact ball bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is: the main cross-sectional structural diagram of the utility model;

[0021] Figure 2 Yes: Main cross-sectional structural diagram of the stainless steel jacket.

[0022] Explanation of the reference numerals: stainless steel outer sleeve 1, stainless steel inner sleeve 2, silicon nitride ceramic ball 3, polyimide resin retaining frame 4. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 to Figure 2 As shown, a self-lubricating ultra-low temperature angular contact ball bearing is a high-precision ultra-low temperature self-lubricating bearing, such as Figure 1 As shown, it comprises a stainless steel outer sleeve 1 and a stainless steel inner sleeve 2; a contact angle α is provided on the inner side of the stainless steel outer sleeve 1, and the contact angle α is 15°, which can withstand a certain axial load force and enable the bearing to have a higher speed performance;

[0025] like Figure 1 As shown, it also includes a plurality of silicon nitride ceramic balls 3 and a polyimide resin retainer 4;

[0026] The polyimide resin retainer 4 is an inner guide retainer with a self-lubricating function. The inner ring of the polyimide resin retainer 4 is arranged near the stainless steel inner sleeve 2. The inner ring of the polyimide resin retainer 4 and the outer edge of the stainless steel inner sleeve 2 are clearance-matched. The stainless steel inner sleeve 2 is a rotating ring, which provides a rolling body with a drag torque when rotating.

[0027] When the bearing rotates, the polyimide at the inner end of the polyimide resin cage 4 is easily transferred and attached to the silicon nitride ceramic ball 3 and the raceway surface of the stainless steel inner sleeve 2 to form a lubricating film, thereby reducing the friction and wear of the bearing assembly and maintaining a suitable service life of the bearing at ultra-low temperatures.

[0028] like Figure 2 As shown, a slope angle β is provided on one side of the inner side of the stainless steel jacket 1, and the slope angle β is 3°. The slope and the bottom of the ferrule groove form a ball loading lock, which is conducive to ball loading and does not damage the ball during loading.

[0029] like Figure 1 and Figure 2 As shown, the outer diameter φ1 of the bearing outer sleeve is 15 mm, the inner diameter φ2 of the bearing inner sleeve is 10 mm, and the bearing width S is 3 mm; the diameter φ3 of the silicon nitride ceramic balls 3 is 1.2 mm, and there are 12 of them. The silicon nitride ceramic balls 3 are separated by a retaining frame and are evenly arranged in the raceway between the bearing outer sleeve and the bearing inner sleeve. The above dimensions can vary within a certain range as needed.

[0030] like Figure 1 As shown, the self-lubricating ultra-low temperature ball bearing has an operating temperature of -196 to 55°C and an operating speed of 6000 to 7000 r / min. The above operating temperature and operating speed can be changed within a certain range as required.

[0031] like Figure 1 and Figure 2 As shown, the arc raceway height T on one side of the slope angle of the stainless steel jacket 1, that is, the ball locking amount, is 0.04 mm.

[0032] like Figure 1 As shown, the polyimide resin retainer 4 is annular in structure, the pockets of the polyimide resin retainer 4 are arranged in an even number, 12 spherical pockets are evenly distributed on its outer surface, and 12 silicon nitride ceramic balls 3 are arranged in the spherical pockets one by one.

[0033] like Figure 1 As shown, the cage is made of polyimide as the main raw material. When the bearing rotates, the cage material adheres to the silicon nitride ceramic ball 3 and the surface of the ring raceway in sequence to form a lubricating film.

[0034] like Figure 1 As shown, the material of the silicon nitride ceramic ball 3 is silicon nitride ceramic material (Si3N4). The silicon nitride ceramic ball 3 has the advantages of high hardness, good wear resistance, small expansion coefficient under low temperature conditions, and no oxidation, and is suitable for working in ultra-low temperature environment.

[0035] like Figure 1As shown, the bearing outer sleeve and inner sleeve are made of G102 Cr 18Mo stainless steel.

[0036] The utility model is also suitable for deep groove ball bearings and meets the requirements of ultra-low temperature self-lubrication.

[0037] The embodiments described above are only preferred implementations of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-lubricating ultra-low temperature angular contact ball bearing, which is a high-precision ultra-low temperature self-lubricating bearing, comprising a stainless steel outer sleeve and a stainless steel inner sleeve; a contact angle is provided on the inner side of the stainless steel outer sleeve, and the contact angle is 14-16°; characterized in that: Also included are a number of silicon nitride ceramic balls and a polyimide resin cage; The polyimide resin cage is an inner-guiding cage with self-lubricating function. The inner ring of the polyimide resin cage is arranged near the stainless steel inner sleeve. The inner ring of the polyimide resin cage and the outer edge of the stainless steel inner sleeve are clearance-matched. The stainless steel inner sleeve is a rotating ring, which provides rolling elements with drag torque when rotating. A slope angle is arranged on one side of the inner side of the stainless steel outer sleeve, and the slope angle is 2.75-3.25 degrees. The slope and the groove bottom of the ferrule form a ball locking amount.

2. A self-lubricating ultra-low temperature angular contact ball bearing according to claim 1, characterized in that: The outer diameter of the bearing outer sleeve is 15 mm, the inner diameter of the bearing inner sleeve is 10 mm, and the bearing width is 3 mm; the diameter of the silicon nitride ceramic balls is 1.2 mm, and there are 12 of them. The silicon nitride ceramic balls are separated by a retaining frame and evenly arranged in the raceway between the bearing outer sleeve and the bearing inner sleeve.

3. The self-lubricating ultra-low temperature angular contact ball bearing according to claim 1, characterized in that: The self-lubricating ultra-low temperature ball bearing has an operating temperature of -196 to 55°C and an operating speed of 6000 to 7000 r / min.

4. The self-lubricating ultra-low temperature angular contact ball bearing according to claim 1, characterized in that: The contact angle is 15°; the slope angle is 3°, and the arc raceway height on one side of the slope angle of the stainless steel jacket, that is, the ball locking amount, is 0.04 mm.

5. The self-lubricating ultra-low temperature angular contact ball bearing according to claim 1, characterized in that: The polyimide resin retainer is annular in structure, and 12 spherical pockets are evenly distributed on its outer surface, and 12 silicon nitride ceramic balls are arranged in the spherical pockets in a one-to-one correspondence.

6. The self-lubricating ultra-low temperature angular contact ball bearing according to claim 1, characterized in that: The cage is made of polyimide as the main raw material. When the bearing rotates, the cage material adheres to the silicon nitride ceramic ball and the raceway surface of the ring in sequence to form a lubricating film.

7. The self-lubricating ultra-low temperature angular contact ball bearing according to claim 1, characterized in that: The material of the silicon nitride ceramic ball is silicon nitride ceramic material (Si3N4).

8. The self-lubricating ultra-low temperature angular contact ball bearing according to claim 1, characterized in that: The bearing outer sleeve and inner sleeve are made of G102 Cr 18Mo stainless steel.

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