Ceramic precision part with inner hole capable of achieving mirror surface effect

Abstract

The utility model provides a ceramic precision part with an inner hole capable of achieving a mirror surface effect, and belongs to the technical field of ceramic precision parts. Comprising an inner ring and an outer ring, the inner ring is located in the outer ring, the inner ring and the outer ring are located on the same horizontal plane, and the vertical center lines of the inner ring and the outer ring coincide; the multiple balls are divided into two groups, each group of balls are distributed in an annular array mode with the vertical center line of the inner ring as the axis, and the balls in the two groups correspond to each other. According to the utility model, the dumbbell-shaped balls are matched with the annular grooves in the inner ring and the outer ring, so that the purpose of reducing the contact stress between the balls and a raceway is achieved; the purpose of effectively preventing impurities such as high dust, moist and corrosive media from entering the bearing is achieved.

Description

Technical Field

[0001] This utility model relates to the field of ceramic precision parts technology, and in particular to a ceramic precision part with an inner hole that can achieve a mirror-like effect. Background Technology

[0002] Ceramic materials, due to their superior properties such as high hardness, high wear resistance, low coefficient of friction, good chemical stability, and high temperature resistance, have been widely used in many precision engineering fields. Especially in applications with extremely high requirements for precision and reliability, such as aerospace, semiconductor manufacturing, and medical devices, ceramic precision components play an irreplaceable role.

[0003] However, in existing ceramic precision component technology, especially in structures involving rolling elements such as ceramic bearings, the balls in traditional ceramic bearings are standard spherical. When bearing loads, the balls make point contact with the inner and outer raceways, leading to high concentration of contact stress. When the bearing is subjected to large radial loads or operates under heavy load conditions, this point contact method easily causes localized plastic deformation, microcracks, and other damage to the raceway surface, thus affecting the bearing's accuracy and service life. Moreover, in practical applications, factors such as shaft bending deformation, installation errors, and uneven external loads are difficult to completely avoid. These factors can cause uneven stress distribution among the balls, accelerating bearing wear and reducing its overall performance and reliability. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a ceramic precision part with an inner hole that can achieve a mirror finish. This solves the problem that existing ceramic precision parts are prone to damage to the raceway due to stress concentration when bearing large loads, and that existing ceramic bearing sealing structures, which usually use rubber sealing rings, may not be able to effectively prevent impurities from entering the bearing in some harsh working environments, such as high dust, humid or corrosive environments.

[0005] Technical Solution: To achieve the above objectives, this utility model provides the following technical solution: A precision ceramic component with a mirror-like inner bore, comprising: an inner ring and an outer ring, wherein the inner ring is located within the outer ring and the inner and outer rings are on the same horizontal plane, and the vertical center lines of the inner and outer rings coincide; and multiple balls, which are divided into two groups, with each group of balls arranged in a circular array around the vertical center line of the inner ring as the axis, and the balls in the two groups corresponding to each other. The balls are located in the gap between the inner and outer rings, and two corresponding balls are connected by a connecting shaft to form a dumbbell shape. The inner and outer rings can be made of silicon nitride (Si3N4) or zirconium oxide (ZrO2) ceramic materials. Silicon nitride ceramics have high strength, high hardness, high elastic modulus, low coefficient of thermal expansion, and excellent chemical stability; zirconium oxide ceramics have good toughness, wear resistance, and corrosion resistance.

[0006] In a further embodiment, a retainer is stably mounted between the inner and outer rings. The retainer is used to define the position of the balls. The material of the retainer should possess good wear resistance, self-lubrication, and chemical stability to adapt to the working environment of the precision ceramic parts. Simultaneously, the structural design of the retainer should consider its good fit with the balls, inner ring, and outer ring, as well as its stability and reliability during high-speed operation. The contact area between the retainer and the balls should be finely machined and treated to ensure a smooth surface free of burrs and sharp edges to avoid scratching the ball surface. The dimensional accuracy of the retainer should match the size of the balls, with the tolerances of its inner and outer diameters controlled within ±0.02 mm to ensure the free rotation and positional accuracy of the balls within the retainer.

[0007] In a further embodiment, two sealing rings are provided, and the two sealing rings are disposed at the two ends of the retainer away from the balls. The sealing rings are used to seal the gap between the inner ring and the outer ring. The material of the sealing rings should have good sealing performance, corrosion resistance, and wear resistance, and can be made of materials such as ceramics, rubber, or plastics. The installation method of the sealing rings should ensure a tight fit between them and the inner and outer rings without affecting the normal operation of the balls. The inner and outer diameters of the sealing rings should be adapted to the corresponding dimensions of the inner and outer rings, and the fit clearance can be controlled between 0.05-0.1mm. The thickness of the sealing rings should be reasonably designed according to their sealing and strength requirements, generally between 3-8mm. In addition, the surface of the sealing rings can be treated with anti-corrosion coating, such as by applying an anti-corrosion coating.

[0008] In a further embodiment, multiple sealing rings are provided, and these multiple sealing rings are disposed at the contact positions between the sealing ring and the inner and outer rings. The sealing rings are used for sealing between the sealing ring and the inner and outer rings. The material of the sealing rings should have good elasticity, corrosion resistance, and temperature resistance to adapt to different working environments. The installation position of the sealing rings should be accurate to ensure that they form an effective sealing barrier between the sealing rings. The cross-sectional shape and size of the sealing rings should be designed according to the fit clearance between the sealing rings, and its compression should be controlled within a suitable range, generally between 15% and 25%, to ensure a good sealing effect. The hardness of the sealing rings should be moderate, having sufficient elasticity to fill the gap, but not too hard to affect the sealing effect or cause component wear.

[0009] In a further embodiment, both the inner and outer rings have annular grooves at their contact points with the ball. These annular grooves define the installation position of the ball, and their shape and size should match the shape and size of the ball to ensure accurate installation and free rolling within the groove. The surface quality of the annular groove significantly affects the ball's motion performance and service life, and therefore requires meticulous machining and processing. The depth and width of the annular groove should be rationally designed based on the ball's diameter and load requirements, with the depth generally between 10% and 15% of the ball's diameter and the width between 1.1 and 1.3 times the ball's diameter. The surface roughness of the groove should be controlled between Ra0.2 and Ra0.4 μm to reduce friction and wear between the ball and the groove.

[0010] In a further embodiment, the retainer is configured as two detachable and assembleable parts, which can be connected by means of slots, snaps, bolts, or pins. Slot and snap connections have the advantages of simple structure and convenient installation; bolt and pin connections have the characteristics of firm connection and high reliability; the material of the connecting shaft should have high strength, high hardness and good wear resistance to ensure that it will not break or wear during long-term use.

[0011] In a further embodiment, the diameter of the connecting shaft is adapted to the gap between the inner and outer rings, wherein the length of the connecting shaft should be precisely designed according to the diameter of the ball and the distance between the two sets of balls to ensure the overall dimensional accuracy of the dumbbell-shaped structure; the surface of the connecting shaft should be smoothed, and its roughness can be controlled between Ra0.2-Ra0.3μm to reduce friction with the balls and other components.

[0012] Beneficial effects: 1. The dumbbell-shaped balls, in conjunction with the annular grooves on the inner and outer rings, reduce the contact stress between the balls and the raceways. The unique spherical ends and cylindrical middle structure of the dumbbell-shaped balls ensure that the cylindrical middle portion forms line contact with the raceways during operation, expanding the contact area. The annular grooves on the inner and outer rings precisely define the ball's trajectory, ensuring that the dumbbell-shaped balls are always under optimal stress. This reduces raceway damage and extends the service life of precision ceramic parts.

[0013] 2. By utilizing the sealing rings at both ends of the retainer, multiple sealing rings, and the coordinated operation of the inner and outer rings, the bearing effectively prevents impurities such as high dust, moisture, and corrosive media from entering its interior. The sealing rings at both ends of the retainer initially resist the intrusion of impurities; their material is robust and has good sealing performance, capable of blocking external contaminants over a large area; and the multiple sealing rings are respectively located at the contact positions between the sealing rings and the inner and outer rings, further enhancing the sealing effect. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 for Figure 1 A schematic diagram of the main cross-section.

[0017] Figure 3 This is a schematic diagram of the retainer.

[0018] Figure 4 for Figure 1 The unfolded diagram.

[0019] Figure 5 for Figure 2 A schematic diagram of the structure at point A.

[0020] The reference numerals in the figure are: 1. Outer ring; 2. Inner ring; 3. Ball; 4. Retainer; 401. Sealing ring; 5. Sealing ring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in this utility model are described clearly and completely. Obviously, the described embodiments are only some, not all, of the embodiments in this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this utility model without creative effort are within the scope of protection of this utility model.

[0022] This application provides a ceramic precision component with a mirror-like inner bore, solving the technical problems of existing ceramic precision components being prone to raceway damage due to stress concentration at the contact point between the balls and raceways under heavy loads, and the fact that existing ceramic bearing sealing structures, typically using rubber seals, may not effectively prevent impurities from entering the bearing in harsh working environments such as high-dust, humid, or corrosive environments. In practical use, this achieves the goals of reducing contact stress between the balls and raceways, minimizing raceway damage, and effectively preventing impurities such as dust, moisture, and corrosive media from entering the bearing.

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] Reference Figure 1-5 A precision ceramic component with a mirror-like inner hole includes: an inner ring 2 and an outer ring 1, wherein the inner ring 2 is located inside the outer ring 1 and the inner ring 2 and the outer ring 1 are on the same horizontal plane, and the vertical center lines of the inner ring 2 and the outer ring 1 coincide; and multiple balls 3, which are divided into two groups, and each group of balls 3 is arranged in a circular array with the vertical center line of the inner ring 2 as the axis, and the balls 3 in the two groups correspond to each other. The balls 3 are located in the gap between the inner ring 2 and the outer ring 1, and two corresponding balls 3 are connected by a connecting shaft to make the whole part dumbbell-shaped.

[0025] The concentric and horizontal arrangement of the inner ring 2 and outer ring 1 provides a stable track foundation for the ball bearings 3. The ball bearings 3, distributed in a grouped ring array, form a dumbbell-shaped structure through connecting shafts. This not only increases the bearing area and disperses the load, but also effectively copes with forces in different directions, improving the overall load-bearing capacity and stability, and ensuring smooth relative rotation under various working conditions.

[0026] The retainer 4 is stably installed between the inner ring 2 and the outer ring 1, and the retainer 4 is used to define the position of the ball 3.

[0027] The retainer 4 is stably installed between the inner ring 2 and the outer ring 1. Its structural design can limit the balls 3 to a specific position, ensuring that each ball 3 maintains a uniform spacing and correct arrangement during operation, avoiding collisions and misalignment between the balls 3, thereby improving the smoothness and reliability of the bearing operation and reducing the risk of wear and failure caused by disordered ball 3 position.

[0028] Two sealing rings 401 are provided, and the two sealing rings 401 are disposed at the two ends of the retainer 4 away from the ball 3. The sealing rings 401 are used to seal the gap between the inner ring 2 and the outer ring 1.

[0029] Two sealing rings 401 are located at the ends of the retainer 4 away from the balls 3, which can block most external impurities, dust, moisture and other substances from entering the gap between the inner ring 2 and the outer ring 1, providing the first layer of protection for the balls 3, retainer 4 and other components inside the bearing, reducing wear and corrosion caused by the intrusion of external contaminants, and extending the service life of the bearing.

[0030] Multiple sealing rings 5 ​​are provided, and the multiple sealing rings 5 ​​are disposed at the contact positions between the sealing ring 401 and the inner ring 2 and the outer ring 1. The sealing rings 5 ​​are used for sealing between the sealing ring 401 and the inner ring 2 and the outer ring 1.

[0031] Multiple sealing rings 5 ​​are distributed at the contact positions between the sealing ring 401 and the inner ring 2 and the outer ring 1, closely fitting the surfaces of each component and filling any tiny gaps that may exist between the sealing ring 401 and the inner ring 2 and the outer ring 1. This further enhances the tightness of the seal and effectively prevents harsh environmental factors such as high dust, moisture or corrosive media from eroding the inside of the bearing, thus comprehensively ensuring the cleanliness and safety of the bearing's internal structure.

[0032] The inner ring 2 and outer ring 1 are provided with annular grooves at the contact positions with the ball 3. The annular grooves are used to limit the installation position of the ball 3.

[0033] The annular grooves provided at the contact positions between the inner ring 2 and the outer ring 1 and the ball 3 provide a precise trajectory for the installation and movement of the ball 3. The ball 3 rolls in the groove and can always stay on the designed path, reducing the axial and radial movement of the ball 3 during the movement process, improving the operating accuracy and stability of the bearing, and also helping to evenly distribute the load and reduce contact stress.

[0034] The retainer 4 is configured as two detachable and assembleable parts.

[0035] The retainer 4 is designed as two detachable and assembleable parts, which can be easily installed. During maintenance and repair, it can be easily disassembled, making it convenient to inspect, clean and replace components such as ball bearing 3, inner ring 2 and outer ring 1. This greatly reduces the difficulty of maintenance, shortens the maintenance time and improves the maintainability of the equipment.

[0036] The diameter of the connecting shaft is adapted to the gap between the inner ring 2 and the outer ring 1.

[0037] The diameter of the connecting shaft is matched with the clearance between the inner ring 2 and the outer ring 1, ensuring that the dumbbell-shaped ball 3 has sufficient space to rotate freely between the inner and outer rings 1, while preventing wobbling or displacement due to excessive clearance. This allows the ball 3 to maintain a stable motion during operation, reducing energy loss and improving the bearing's operating efficiency and stability.

[0038] During use, when the ceramic precision component starts working, the inner ring 2 and outer ring 1, with their concentric and horizontally arranged stable structure, lay the foundation for the entire system. The gap between the inner ring 2 and outer ring 1 provides space for the arrangement of dumbbell-shaped balls 3. Multiple dumbbell-shaped balls 3 are arranged in a circular array around the vertical center line of the inner ring 2. During operation, because the inner ring 2 and outer ring 1 have annular grooves at the contact points with the balls 3, the balls 3 roll along the trajectory defined by the grooves, ensuring the accuracy and stability of their movement. At the same time, the retainer 4 is stably installed between the inner ring 2 and outer ring 1, and its own structure limits the position of the balls 3, so that each group of balls 3 can maintain a uniform spacing and arrangement during operation, avoiding collisions or displacement between the balls 3. During equipment operation, when the ceramic precision component bears a load, the middle connecting shaft of the dumbbell-shaped balls 3 and the rolling... The line contact of the raceway, combined with the fit between the spherical parts at both ends and the grooves, effectively disperses the load and reduces the contact stress between the ball 3 and the raceway, thereby reducing the risk of damage to the raceway and ensuring stable operation of precision components under high load conditions. In harsh working environments, the sealing structure composed of the sealing ring 401 and the sealing ring 5 seals the inside of the bearing. The sealing ring 401 located at both ends of the retainer 4 first blocks most external impurities, such as dust and moisture. Multiple sealing rings 5 ​​further enhance the sealing effect. They fit tightly against the contact positions of the sealing ring 401 and the inner ring 2 and outer ring 1 to prevent the intrusion of high dust, moisture or corrosive media. If maintenance or repair of ceramic precision components is required during operation, the removable two-part design of the retainer 4 provides great convenience. It can be easily disassembled to inspect, clean or replace internal components such as the ball 3, inner ring 2, and outer ring 1.

[0039] The figures shown in the accompanying drawings are illustrative and are intended only to more intuitively demonstrate the key structure and connection relationships of a ceramic precision component with an inner hole that can achieve a mirror-like effect. In practical applications, the appearance and size of the device can be adjusted and optimized according to specific needs.

[0040] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To ensure a thorough understanding of this utility model, specific details have been described in detail in the preferred embodiments above; however, those skilled in the art can fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A ceramic precision component with an inner hole achieving a mirror finish, comprising an inner ring (2) and an outer ring (1), characterized in that: The inner ring (2) is located inside the outer ring (1), and the inner ring (2) and the outer ring (1) are on the same horizontal plane, and the vertical center lines of the inner ring (2) and the outer ring (1) coincide. There are multiple balls (3), and the multiple balls (3) are divided into two groups. Each group of balls (3) is arranged in a ring array with the vertical center line of the inner ring (2) as the axis. The balls (3) in the two groups correspond to each other. The balls (3) are located in the gap between the inner ring (2) and the outer ring (1). Two corresponding balls (3) are connected by a connecting shaft so that the whole is dumbbell-shaped.

2. A ceramic precision part with an inner hole achieving a mirror-like effect according to claim 1, characterized in that, Also includes: A retainer (4) is stably installed between the inner ring (2) and the outer ring (1), and the retainer (4) is used to define the position of the ball (3).

3. A ceramic precision part with an inner hole achieving a mirror-like effect according to claim 2, characterized in that, Also includes: Two sealing rings (401) are provided, and the two sealing rings (401) are disposed at both ends of the retainer (4) away from the ball (3). The sealing rings (401) are used to seal the gap between the inner ring (2) and the outer ring (1).

4. A ceramic precision part with an inner hole achieving a mirror-like effect according to claim 3, characterized in that, Also includes: A plurality of sealing rings (5) are provided, and the plurality of sealing rings (5) are disposed at the contact positions between the sealing ring (401) and the inner ring (2) and the outer ring (1), and the sealing rings (5) are used for sealing between the sealing ring (401) and the inner ring (2) and the outer ring (1).

5. A ceramic precision part with an inner hole achieving a mirror-like effect according to claim 1, characterized in that: The inner ring (2) and outer ring (1) are provided with annular grooves at the contact positions with the ball (3), and the annular grooves are used to limit the installation position of the ball (3).

6. A ceramic precision part with an inner hole achieving a mirror-like effect according to claim 2, characterized in that: The retainer (4) is configured as two detachable and assembleable parts.

7. A ceramic precision part with an inner hole achieving a mirror-like effect according to claim 1, characterized in that: The diameter of the connecting shaft is adapted to the gap between the inner ring (2) and the outer ring (1).

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