Deep groove ball bearing integrated combination structure and method

Abstract

The invention relates to the technical field of bearing machinery, and discloses a deep groove ball bearing integrated combined structure and method, and the deep groove ball bearing integrated combined structure comprises a deep groove ball bearing I, a deep groove ball bearing II and an integrated double-row self-lubricating retainer; the first deep groove ball bearing is composed of a first outer ring, a first inner ring and a first steel ball, and the second deep groove ball bearing is composed of a second outer ring, a second inner ring and a second steel ball. The first deep groove ball bearing and the second deep groove ball bearing are installed in series and share the integrated double-row self-lubricating retainer. Round pocket openings and U-shaped pocket openings which are distributed in a staggered mode are formed in the edges of the two sides of the integrated double-row self-lubricating retainer, and the two rows of pocket openings are distributed alternately. The integrated double-row self-lubricating retainer is adopted to replace the traditional design of two sets of independent retainers, so that the distance between the two rows of steel balls is remarkably reduced, the structural strength of the retainer is improved within the limited bearing width (the safety coefficient is greater than or equal to 3.6), the collision frequency caused by the differential speed of the inner ring is reduced, and the operation stability of the bearing under the working conditions of high speed and high load is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing machinery, and particularly to an integrated combined structure and method for deep groove ball bearings. Background Art

[0002] As a widely used type of rolling bearing, deep groove ball bearings are widely used in rotating mechanisms that bear single radial loads or both radial and axial combined loads due to their characteristics such as low friction, simple structure, and high rotational speed. Its basic structure includes four parts: an outer ring, an inner ring, steel balls, and a cage, and can effectively withstand the operating requirements under various working conditions. In various mechanical devices such as electric motors, automotive transmission systems, and household appliances, deep groove ball bearings play a key role with their efficient and stable performance.

[0003] However, with the continuous improvement of high technology, harsh working environments, and requirements for equipment performance, traditional single deep groove ball bearings face many performance bottlenecks in environments such as high load, high temperature, and high radiation. Especially in some high-load operating transmission systems, bearings need to have high load-carrying capacity, long service life, and high reliability, while the existing single bearing structure often cannot meet these strict requirements.

[0004] For certain transmission systems, such as the support of the planetary gear shaft of a speed reducer, the bearing not only needs to provide efficient support but also needs to have good self-lubricating ability to reduce performance degradation caused by friction. In harsh working conditions such as high temperature and high radiation, the self-lubricating ability and strength of the bearing must be balanced to ensure that it can still maintain good operating conditions under long-term working conditions. However, in the case of limited installation space, the design of the cage of traditional single deep groove ball bearings often cannot meet the dual requirements of self-lubrication and strength, resulting in reduced life and reliability of the bearing under high load conditions.

[0005] In addition, existing deep groove ball bearings often cannot meet the requirements of double or multiple sets of combined assembly, which further limits their performance under high load or long-term high temperature and high radiation working conditions.

[0006] To address this problem, traditional single-structured deep groove ball bearings often have a contradiction between strength and lubrication performance. Therefore, there is an urgent need for a new type of deep groove ball bearing structure that can improve the strength and reliability of the bearing while ensuring load-carrying capacity and self-lubricating function through innovative combination methods, and can better meet the strict requirements of modern mechanical equipment for deep groove ball bearings. Summary of the Invention

[0007] The purpose of the present invention is to provide an integrated combined structure and method for deep groove ball bearings to solve the problems raised in the above background art.

[0008] To achieve the above object, the present invention provides the following technical solutions: A technical solution for an integrated combined structure of deep groove ball bearings, comprising: deep groove ball bearing one, deep groove ball bearing two, and an integrated double-row self-lubricating cage; The deep groove ball bearing one is composed of an outer ring one, an inner ring one, and balls one, and the deep groove ball bearing two is composed of an outer ring two, an inner ring two, and balls two; The deep groove ball bearing one and the deep groove ball bearing two are installed in series and share the integrated double-row self-lubricating cage; The integrated double-row self-lubricating cage is provided with circular pockets and U-shaped pockets that are staggered on both sides of the edge, and the two rows of pockets are alternately distributed; The integrated double-row self-lubricating cage is formed by sintering and curing austenitic stainless steel powder and graphite powder, and is subjected to stress relief treatment and machining.

[0009] As a preferred technical solution, the inner ring walls of the outer ring one and the outer ring two are respectively provided with an outer ring one ball groove and an outer ring two ball groove, and the outer ring walls of the inner ring one and the inner ring two are respectively provided with an inner ring one ball groove and an inner ring two ball groove; The balls one and the balls two are respectively embedded in the corresponding ball grooves, and rolling limit fit is achieved through the circular pockets and U-shaped pockets on the integrated double-row self-lubricating cage.

[0010] As a preferred technical solution, the alternating distribution design of the circular pockets and the U-shaped pockets improves the filling property of the balls one and the balls two during the assembly process and reduces assembly damage.

[0011] As a preferred technical solution, the mass ratio of the austenitic stainless steel powder to the graphite powder is 3:1 to 5:1, and a cage structure with self-lubricating performance is formed after sintering and curing.

[0012] As a preferred technical solution, when the integrated double-row self-lubricating cage is operating, the maximum stress between the cage and the balls is lower than the yield strength of the material, and the safety factor is not less than 3.6.

[0013] As a preferred technical solution, the sintering process parameters of the austenitic stainless steel powder and the graphite powder include: sintering temperature is 1050°C - 1150°C, pressure is 8 - 12 MPa, heat preservation time is 2 - 4 hours, and after sintering, it is cooled to room temperature under argon protection to enhance the density and self-lubricating performance of the integrated double-row self-lubricating cage.

[0014] As a preferred technical solution, the distribution density of the circular pockets and the U-shaped pockets is to set a U-shaped pocket every other circular pocket in each row of the cage, and the axial distance between the two rows of pockets is 0.8 - 1.2 times the diameter of the balls, so as to optimize the rolling track of the balls and reduce the collision frequency.

[0015] A technical solution for an integrated combination method of deep groove ball bearings, comprising the following steps: (a) After sleeving the outer ring one and the inner ring one, fill in the first set of steel balls, and arrange the first set of steel balls equidistantly in the circumferential direction; (b) Heat the integrated double-row self-lubricating cage to 70 °C, and press-fit the first set of steel balls into the circular pocket and U-shaped pocket through a special tooling; (c) Repeat steps (a) and (b), sleeve the outer ring two and the inner ring two, fill in the second set of steel balls, and complete the press-fitting; (d) Combine the two sets of bearings in series through the integrated double-row self-lubricating cage to form an overall structure.

[0016] As a preferred technical solution, the duration of the heating step is 1 minute, and during the press-fitting process, the contact surfaces between the pockets of the integrated double-row self-lubricating cage and the first set of steel balls and the second set of steel balls are reduced in frictional loss through graphite powder.

[0017] As a preferred technical solution, in the press-fitting step, by real-time monitoring the deformation amount of the integrated double-row self-lubricating cage, control the press-fitting pressure within the range of 50 - 80 N, and cooperate with the laser positioning device to ensure the precise alignment of the first set of steel balls and the second set of steel balls with the pockets, and the assembly error is less than 0.05 mm.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The present invention is an integrated combination structure and method for deep groove ball bearings. By adopting an integrated double-row self-lubricating cage, it replaces the traditional design of two sets of independent cages, significantly reducing the distance between the two rows of steel balls. Within the limited bearing width, it not only improves the structural strength of the cage (safety factor ≥ 3.6), but also reduces the collision frequency caused by the differential speed of the inner ring, ensuring the running stability of the bearing under high-speed and high-load conditions.

[0019] The present invention is an integrated combination structure and method for deep groove ball bearings. The cage is made of a composite material of austenitic stainless steel powder and graphite (mass ratio 3:1 - 5:1), and a dense self-lubricating structure is formed through a sintering process (1050 °C - 1150 °C, 8 - 12 MPa, argon protection cooling). This design enables the bearing to operate without traditional lubricating oil / grease in harsh environments such as high temperature and strong radiation, achieving maintenance-free operation throughout the entire life cycle, and is especially suitable for special scenarios.

[0020] The present invention is an integrated combination structure and method for deep groove ball bearings. The alternating circular pocket and U-shaped pocket design of the cage, combined with the press-fitting process (heating at 70 °C, pressure of 50 - 80 N, laser positioning error < 0.05 mm), effectively increases the steel ball filling rate by more than 15%, reduces assembly damage, and at the same time enhances the self-guiding ability of the steel balls through the "ball locking" effect, reducing the running frictional loss.

[0021] The present invention relates to an integrated combined structure and method for deep groove ball bearings. Compared with a single deep groove ball bearing, the combined structure has a rated load increased by about 54% under special working conditions, the contact stress of the raceway of the ring is reduced by 15%, and the basic fatigue life is extended by 264%. In addition, the maximum stress of the cage is lower than the yield strength of the material, and the axial distance between the two rows of pockets (0.8 - 1.2 times the diameter of the steel ball) optimizes the rolling track of the steel ball, further reducing the risk of stress concentration under dynamic loads. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall structure of an integrated combined structure and method for deep groove ball bearings; Figure 2 It is a schematic diagram of the cross-sectional structure of an integrated combined structure and method for deep groove ball bearings; Figure 3 It is a schematic diagram of an integrated double-row self-lubricating cage of an integrated combined structure and method for deep groove ball bearings; Figure 4 It is a schematic diagram of a simulation model of an integrated double-row self-lubricating cage of an integrated combined structure and method for deep groove ball bearings; Figure 5 It is a pressure analysis diagram of an integrated double-row self-lubricating cage of an integrated combined structure and method for deep groove ball bearings.

[0023] In the reference numerals of the drawings: 1, outer ring one; 11, outer ring ball groove; 2, inner ring one; 21, inner ring ball groove; 3, steel ball one; 4, outer ring two; 41, outer ring two ball groove; 5, inner ring two; 51, inner ring two ball groove; 6, steel ball two; 7, integrated double-row self-lubricating cage; 71, circular pocket; 72, U-shaped pocket. Detailed Embodiments

[0024] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For those skilled in the art, the present invention can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

[0025] Such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the present invention provides an integrated combined structure and method for deep groove ball bearings. The technical solution includes deep groove ball bearings 1, 2, 3 and deep groove ball bearings 4, 5, 6, as well as an integrated double-row self-lubricating cage 7. The deep groove ball bearing 1 consists of an outer ring 1, an inner ring 2 and a ball 3, and the deep groove ball bearing 2 consists of an outer ring 4, an inner ring 5 and a ball 6. The deep groove ball bearings 1 and 2 are installed in series and share the integrated double-row self-lubricating cage 7.

[0026] Circular pockets 71 and U-shaped pockets 72 are arranged in a staggered manner at both side edges of the integrated double-row self-lubricating cage 7, as Figure 3 shown. The two rows of pockets are alternately distributed to optimize the rolling trajectory of the balls and reduce the collision frequency. The cage 7 is formed by sintering and curing austenitic stainless steel powder and graphite powder, and is subjected to stress relief treatment and machining to ensure its sufficient strength and self-lubricating performance.

[0027] During the assembly process, outer raceway grooves 11 and outer raceway grooves 41 are respectively provided on the inner raceway walls of the outer ring 1 and the outer ring 4, and inner raceway grooves 21 and inner raceway grooves 51 are respectively provided on the outer raceway walls of the inner ring 2 and the inner ring 5. The balls 3 and the balls 6 are respectively inserted into the corresponding raceway grooves, and rolling limit fit is achieved through the circular pockets 71 and the U-shaped pockets 72 on the integrated double-row self-lubricating cage 7.

[0028] In order to further improve the assembly efficiency and quality, the alternating distribution design of the circular pockets 71 and the U-shaped pockets 72 can improve the filling of the balls and reduce assembly damage. The mass ratio of austenitic stainless steel powder to graphite powder is 3:1 to 5:1, and a cage structure with self-lubricating performance is formed after sintering and curing.

[0029] During the operation of the bearing, the maximum stress between the cage and the balls is lower than the yield strength of the material, and the safety factor is not less than 3.6. The sintering process parameters include: sintering temperature is 1050°C - 1150°C, pressure is 8 - 12 MPa, and holding time is 2 - 4 hours. After sintering, it is cooled to room temperature under argon protection to enhance the density and self-lubricating performance of the integrated double-row self-lubricating cage.

[0030] The distribution density of the circular pockets and the U-shaped pockets is such that one U-shaped pocket is set at every other circular pocket in each row of the cage, and the axial distance between the two rows of pockets is 0.8 - 1.2 times the diameter of the balls, so as to optimize the rolling trajectory of the balls and reduce the collision frequency.

[0031] The integrated combined method for deep groove ball bearings includes the following steps: a. After sleeving the outer ring 1 and the inner ring 2, fill in the balls 3 and arrange the balls 3 equidistantly in the circumferential direction; b Heat the integrated double-row self-lubricating cage from 7 to 70 °C, and press-fit the steel balls 3 into the circular pockets 71 and U-shaped pockets 72 through a special tooling. c Repeat steps a and b. After sleeving the outer ring 4 and the inner ring 5, fill in the steel balls 6 and complete the press-fitting. d Combine the two groups of bearings in series through the integrated double-row self-lubricating cage 7 to form an overall structure.

[0032] In the heating step, the duration is 1 minute. During the press-fitting process, the contact surfaces between the pockets of the integrated double-row self-lubricating cage 7 and the steel balls 3 and steel balls 6 reduce frictional losses through graphite powder.

[0033] In the press-fitting step, by real-time monitoring the deformation of the integrated double-row self-lubricating cage 7, control the press-fitting pressure within the range of 50 - 80 N, and cooperate with the laser positioning device to ensure the precise alignment of the steel balls 3 and steel balls 6 with the pockets, with an assembly error of less than 0.05 mm.

[0034] In summary, for the integrated combination structure and method of the deep groove ball bearing of the present invention, through the design of the integrated double-row self-lubricating cage, it not only improves the structural strength and running stability of the bearing, but also realizes the maintenance-free and long-life of the bearing under harsh environments through special materials and processes. In addition, this structure also optimizes the rolling trajectory of the steel balls and reduces the risk of stress concentration under dynamic loads, thus significantly improving the performance and reliability of the bearing.

[0035] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0036] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "setting", "connection", "fixation", "swivel connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor limit the invention to only the specific embodiments. Obviously, according to the above description, many modifications and variations can be made. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and its modified use based on the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An integrated combined structure of a deep groove ball bearing, characterized in that, Including: Deep groove ball bearing one, deep groove ball bearing two, and an integral double-row self-lubricating cage (7); The deep groove ball bearing one is composed of an outer ring one (1), an inner ring one (2), and steel balls one (3), and the deep groove ball bearing two is composed of an outer ring two (4), an inner ring two (5), and steel balls two (6); The deep groove ball bearing one and the deep groove ball bearing two are installed in series and share the integral double-row self-lubricating cage (7); Circular pockets (71) and U-shaped pockets (72) are arranged at staggered positions on both side edges of the integral double-row self-lubricating cage (7), and the two rows of pockets are alternately distributed; The integral double-row self-lubricating cage (7) is formed by sintering and solidifying austenitic stainless steel powder and graphite powder, and is subjected to stress relief treatment and machining.

2. The integrated combined structure of a deep groove ball bearing according to claim 1, wherein: The inner ring walls of the outer ring one (1) and the outer ring two (4) are respectively provided with an outer ring one ball groove (11) and an outer ring two ball groove (41), and the outer ring walls of the inner ring one (2) and the inner ring two (5) are respectively provided with an inner ring one ball groove (21) and an inner ring two ball groove (51); The steel balls one (3) and the steel balls two (6) are respectively inserted into the corresponding ball grooves, and rolling limit fit is achieved through the circular pockets (71) and U-shaped pockets (72) on the integral double-row self-lubricating cage (7).

3. The integrated combined structure of a deep groove ball bearing according to claim 1, wherein: The alternating distribution design of the circular pockets (71) and the U-shaped pockets (72) improves the filling performance of the steel balls one (3) and the steel balls two (6) during the assembly process and reduces assembly damage.

4. A one-piece combined structure of a deep groove ball bearing according to claim 1, characterized in that: The mass ratio of the austenitic stainless steel powder to the graphite powder is 3:1 to 5:1, and a cage structure with self-lubricating performance is formed after sintering and solidifying.

5. The one-piece combined structure of a deep groove ball bearing according to claim 1, wherein: When the integral double-row self-lubricating cage (7) operates, the maximum stress between the cage and the steel balls is lower than the yield strength of the material, and the safety factor is not less than 3.

6.

6. The integrated combined structure of a deep groove ball bearing according to claim 1, characterized in that: The sintering process parameters of the austenitic stainless steel powder and the graphite powder include: the sintering temperature is 1050°C - 1150°C, the pressure is 8 - 12 MPa, the heat preservation time is 2 - 4 hours, and after sintering, it is cooled to room temperature under argon protection to enhance the density and self-lubricating performance of the integral double-row self-lubricating cage (7).

7. A one-piece combined structure of a deep groove ball bearing according to claim 1, characterized in that: The distribution density of the circular pockets (71) and the U-shaped pockets (72) is that one U-shaped pocket (72) is arranged at every other circular pocket (71) in each row of the cage, and the axial distance between the two rows of pockets is 0.8 - 1.2 times the diameter of the steel balls to optimize the rolling trajectory of the steel balls and reduce the collision frequency.

8. An integrated combination method of a deep groove ball bearing according to any one of claims 1 to 7, characterized in that, Including the following steps: (a) After sleeving the outer ring one (1) and the inner ring one (2), fill in the steel balls one (3), and arrange the steel balls one (3) equidistantly in the circumferential direction; (b) Heat the integral double-row self-lubricating cage (7) to 70°C, and press-fit the steel balls one (3) into alignment with the circular pockets (71) and the U-shaped pockets (72) through a special tooling; (c) Repeat steps (a) and (b), sleeve the outer ring two (4) and the inner ring two (5) and fill in the steel balls two (6), and complete the press-fit; (d) The two groups of bearings are combined in series through the integral double-row self-lubricating cage (7) to form an overall structure.

9. The method according to claim 8, wherein: The duration of the heating step is 1 minute, and during the press-fitting process, the contact surfaces between the pockets of the integrated double-row self-lubricating cage (7) and the first steel ball (3) and the second steel ball (6) are reduced in frictional loss through graphite powder.

10. The method according to claim 8, wherein: During the press-fitting step, by real-time monitoring of the deformation of the integrated double-row self-lubricating cage (7), the press-fitting pressure is controlled within the range of 50 - 80 N, and a laser positioning device is used to ensure the precise alignment of the first steel ball (3) and the second steel ball (6) with the pockets, with an assembly error of less than 0.05 mm.

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