High speed rotary table combined bearing with ceramic ball axial rolling elements

Abstract

The application relates to the technical field of bearings, in particular to a high-speed rotary table combined bearing adopting ceramic ball axial rolling bodies, which comprises an axle ring, a seat ring and a gasket, the gasket is arranged between the axle ring and the seat ring; the axle ring and the seat ring are fixed together through screws, a radial roller is arranged in a raceway formed by the gasket and the axle ring; a set of axial retainer and ceramic ball assemblies are arranged in an upper raceway formed by the gasket, the axle ring and the seat ring; another set of axial retainer and ceramic ball assemblies are arranged in a lower raceway formed by the gasket, the axle ring and the seat ring; according to the application, the ceramic ball is adopted as the axial rolling body and is combined with a circular-arc-shaped raceway design, so that the friction coefficient and the contact area are greatly reduced, the friction heat quantity during high-speed operation is effectively reduced, meanwhile, a specially designed "one positive and one reverse" ball pocket brass retainer optimizes the contact state with the ceramic ball, unnecessary vibration and noise are reduced, and the stability of the bearing under high-speed operation is realized.

Description

Technical Field

[0001] This application relates to the field of bearing technology, specifically to a high-speed rotary table combined bearing employing ceramic ball axial rolling elements. Background Technology

[0002] As a core component of precision equipment, rotary table bearings directly affect the operating accuracy, speed, and service life of the equipment. The existing YRT series rotary table bearings, with their unique structural design (consisting of a shaft ring, housing ring, and washers; axial cages and axial roller assemblies are installed in the upper and lower raceways formed by the washers, shaft ring, and housing ring; radial rollers are installed in the raceway formed by the washers and shaft ring), possess significant advantages such as strong axial and radial load-bearing capacity, excellent tilting stiffness, and high rotational accuracy. They are widely used in precision CNC milling machines, chucks, measuring instruments, radar, and rotary tables.

[0003] However, as industrial equipment develops towards higher speeds and precision, certain specific scenarios (such as equipment with relatively small load requirements but extremely high requirements for rotational speed and operational accuracy) place higher demands on rotary table bearings. Existing YRT series rotary table bearings, due to their axial roller structure, have a large contact area between the rolling elements and raceways, resulting in significant heat generation from friction and limiting their limiting speed. Furthermore, the roller structure is prone to lubrication failure and decreased precision stability due to frictional heat generation during high-speed operation, making it difficult to meet the demands of high-speed, high-precision equipment. Utility Model Content

[0004] This application provides a high-speed rotary table combined bearing with ceramic ball axial rolling elements, which can effectively improve rotational speed, reduce frictional heat generation, and ensure precision stability, thus meeting the application requirements of high-speed and high-precision equipment and effectively solving the problems in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: a high-speed rotary table combined bearing using ceramic ball axial rolling elements, comprising a shaft ring, a housing ring, and a washer, wherein the washer is disposed between the shaft ring and the housing ring; the shaft ring and the housing ring are fixed together by screws, and radial rollers are provided in the raceway formed by the washer and the shaft ring.

[0006] An axial retainer and ceramic ball assembly are provided in the upper raceway formed by the washer, shaft ring, and seat ring, and another axial retainer and ceramic ball assembly are provided in the lower raceway formed by the washer, shaft ring, and seat ring.

[0007] The axial cage has a circular array of ball-shaped holes, with adjacent ball-shaped holes arranged in opposite directions.

[0008] The raceways of the bearing ring and seat ring corresponding to the ceramic balls are arc-shaped structures.

[0009] Preferably, the axial retainer is a circular ring structure and is made of brass.

[0010] Preferably, the ceramic ball transmits the load through point contact with the arc-shaped raceway.

[0011] Preferably, the ball pocket of the axial retainer is configured to contact the middle part of the ceramic ball.

[0012] Preferably, the washer has screw holes evenly distributed circumferentially.

[0013] Compared with the prior art, the beneficial effects of this application are: 1. This application, by using ceramic balls as axial rolling elements and combining them with an arc-shaped raceway design, significantly reduces the coefficient of friction and contact area, effectively reducing frictional heat generation during high-speed operation. At the same time, the specially designed "one positive and one negative" ball pocket brass cage optimizes the contact state with the ceramic balls, reducing unnecessary vibration and noise, and together achieves a significant improvement in the bearing's limiting speed and stability under high-speed operation. 2. The excellent high temperature resistance and low thermal expansion characteristics of ceramic materials make the bearing less prone to deformation under high temperature conditions and ensure good stability of key dimensions. Combined with the self-lubricating properties of the brass cage, it can provide a certain degree of protection even when lubrication conditions are temporarily limited, effectively avoiding the decrease in accuracy caused by high temperature deformation or lubrication failure, and significantly extending the service life and accuracy reliability of the bearing in harsh environments. 2. The low friction and lightweight characteristics of ceramic balls, combined with the optimized raceway and cage design, reduce the frictional power consumption and noise level during bearing operation. This makes this bearing particularly suitable for advanced equipment fields with extremely high requirements for rotational speed, running accuracy, low noise, and light load, filling the gaps in traditional high-load bearings in high-speed, high-precision, and light-load applications. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 Schematic diagram of axial cage; Figure 3 This is a cross-sectional view of the axial cage.

[0015] In the diagram: 1 shaft ring, 2 ceramic ball, 3 axial cage, 4 washer, 5 seat ring, 6 radial roller. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] In the description of this application, if directional descriptions are involved, such as "up," "down," "front," "back," "left," "right," etc., indicating directional or positional relationships, they are based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this application and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When a feature is referred to as "set", "fixed", or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0018] Please see Figure 1-3 This application provides the following technical solution: a high-speed rotary table combined bearing with ceramic ball axial rolling elements, including a shaft ring 1, a seat ring 5, and a washer 4, wherein the washer 4 is disposed between the shaft ring 1 and the seat ring 5; the shaft ring 1 and the seat ring 5 are fixed together by screws, and radial rollers 6 are provided in the raceway formed by the washer 4 and the shaft ring 1.

[0019] Specifically, the ceramic ball 2 has a hardness close to or exceeding that of diamond, a smooth surface, a low coefficient of friction, is lightweight, highly wear-resistant and corrosion-resistant, can withstand temperatures above 1000°C, has a low coefficient of thermal expansion, does not deform at high temperatures, and maintains good bearing precision; the rolling element is a ball, with a small contact area, generating less heat through friction, making it suitable for high-speed rotation, and its limiting speed can reach 2-3 times that of a thrust roller bearing.

[0020] An axial retainer 3 and ceramic ball 2 assembly is provided in the upper raceway formed by the washer 4, the shaft ring 1, and the seat ring 5. Another axial retainer 3 and ceramic ball 2 assembly is provided in the lower raceway formed by the washer 4, the shaft ring 1, and the seat ring 5.

[0021] Specifically, the axial cage 3 is made of brass. The friction coefficient between the axial cage 3 and the ceramic ball 2 is low, which reduces heat generation during operation. The brass cage has self-lubricating properties and works well with grease or oil lubrication. Even if there is a short-term lack of oil, it can provide a certain degree of protection. It can quickly transfer frictional heat and avoid local overheating that leads to lubrication failure, making it suitable for high-precision bearings.

[0022] The axial retainer 3 has a circular array of ball-shaped holes, with adjacent ball-shaped holes arranged in opposite directions.

[0023] Specifically, the structure of two adjacent ball pockets with one facing forward and the other in reverse ensures that the axial cage 3 contacts the middle part of the rolling element, avoiding contact with the washer 4 and the shaft ring 1 to prevent friction.

[0024] The raceways of the shaft ring 1 and seat ring 5 corresponding to the ceramic ball 2 are arc-shaped structures.

[0025] Specifically, the raceway adopts an arc-shaped structure, which is beneficial to the positioning of the ceramic ball 2. The load is transferred through the point contact between the ball and the raceway, which has the advantages of compact structure, low frictional heat generation and high speed.

[0026] More specifically, by setting a radial brass cage to isolate the ceramic balls 2, the turntable bearing becomes more flexible and quieter; the raceway adopts an arc-shaped structure to ensure the rolling elements are positioned and rotated, and to ensure the installation and positioning of the radial cage; this utility model improves the rotational speed of the turntable bearing and effectively extends the service life of the turntable bearing.

[0027] Furthermore, the axial retainer 3 is a circular ring structure and is made of brass.

[0028] Furthermore, the ceramic ball 2 transmits the load through point contact with the arc-shaped raceway.

[0029] Specifically, point contact can effectively reduce the contact area, thereby reducing frictional heat generation.

[0030] Furthermore, the ball pocket of the axial retainer 3 is configured to contact the middle part of the ceramic ball 2.

[0031] Furthermore, the washer 4 is provided with screw holes evenly distributed circumferentially.

[0032] Specifically, the screw holes facilitate the installation of the turntable bearings.

[0033] Furthermore, a step is provided at the outer diameter of the shaft ring 1, and the radial rollers 6 are evenly distributed on the radial cage and placed at the step of the shaft ring.

[0034] This application has the following advantages: Ceramic steel balls have high hardness, a smooth surface, a low coefficient of friction, are lightweight, and exhibit strong wear and corrosion resistance. They can withstand high temperatures, have a low coefficient of thermal expansion, do not deform at high temperatures, and maintain good bearing precision. The rolling elements are spherical, resulting in a small contact area and less heat generation from friction, making them suitable for high-speed rotation; their limiting speed can reach 2-3 times that of thrust roller bearings.

[0035] The raceway adopts an arc-shaped structure, which is beneficial for the positioning of ceramic balls 2. The load is transferred through the point contact between the balls and the raceway, which has the advantages of compact structure, low friction and high speed.

[0036] The cage is made of brass, resulting in a low coefficient of friction between the cage and the ceramic balls, reducing heat generation during operation. It also possesses self-lubricating properties, making it suitable for high-precision bearings. The opposing arrangement of adjacent ball pockets ensures proper contact between the cage and the middle of the rolling elements, preventing friction with the raceways.

[0037] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-speed rotary table combined bearing with ceramic ball axial rolling elements, comprising a shaft ring (1), a seat ring (5), and a washer (4), wherein the washer (4) is disposed between the shaft ring (1) and the seat ring (5); the shaft ring (1) and the seat ring (5) are fixed together by screws, and radial rollers (6) are provided in the raceway formed by the washer (4) and the shaft ring (1). Its features are: An axial retainer (3) and ceramic ball (2) assembly is provided in the upper raceway formed by the washer (4), the shaft ring (1), and the seat ring (5), and another axial retainer (3) and ceramic ball (2) assembly is provided in the lower raceway formed by the washer (4), the shaft ring (1), and the seat ring (5); The axial retainer (3) has a circular array of ball pockets evenly distributed on it, and two adjacent ball pockets are arranged in a positive and negative configuration. The raceways of the shaft ring (1) and seat ring (5) corresponding to the ceramic ball (2) are arc-shaped structures.

2. A high-speed rotary table combined bearing employing ceramic ball axial rolling elements according to claim 1, characterized in that, The axial retainer (3) is a circular ring structure and is made of brass.

3. A high-speed rotary table combined bearing employing ceramic ball axial rolling elements according to claim 1, characterized in that, The ceramic ball (2) transmits the load through point contact with the arc-shaped raceway.

4. A high-speed rotary table combined bearing employing ceramic ball axial rolling elements according to claim 1, characterized in that, The ball pocket of the axial retainer (3) is configured to contact the middle part of the ceramic ball (2).

5. A high-speed rotary table combined bearing employing ceramic ball axial rolling elements according to claim 1, characterized in that, The washer (4) has screw holes evenly distributed along the circumference.

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