Ceramic angular contact ball bearing with high bearing capacity

Abstract

The invention relates to the technical field of bearings, and discloses a ceramic angular contact ball bearing with high bearing capacity, the ceramic angular contact ball bearing comprises an outer ring, an inner ring, a rolling body, a retainer and an oil storage cavity, the outer ring is of a cylindrical structure, and the inner surface of the outer ring is in contact with the rolling body; the inner ring is positioned inside the outer ring, and the outer surface of the inner ring is contacted with the rolling body; and the rolling bodies are a plurality of spherical ceramic elements which are fixed and separated by the retainer. By optimizing the arrangement mode and material selection of the rolling bodies, the bearing has higher bearing capacity and anti-overturning performance under the high-load condition; the heat dissipation through holes are formed in the retainer, so that the heat dissipation performance of the bearing in the running process is remarkably improved, and the bearing failure risk caused by overheating is reduced; through the design of the oil storage cavity and the oil outlet micropores matched with the oil storage cavity, uniform supply of lubricating oil is achieved, and friction loss between the rolling body and the inner ring and the outer ring is reduced.

Claims

1. A ceramic angular contact ball bearing with high load-bearing capacity, comprising an outer ring (1), an inner ring (2), rolling elements (3), a cage (4) and an oil storage cavity (5), characterized in that: The outer ring (1) is a cylindrical structure, and its inner surface contacts the rolling element (3); the inner ring (2) is located inside the outer ring (1), and its outer surface contacts the rolling element (3); the rolling element (3) is a plurality of spherical ceramic elements, which are fixed and separated by a retaining frame (4); the retaining frame (4) is provided with a heat dissipation through hole (41); the oil storage cavity (5) is arranged inside the retaining frame (4), and supplies lubricating oil to the contact area between the rolling element (3) and the inner and outer rings through the oil outlet micropores (51).

2. A ceramic angular contact ball bearing with high load-bearing capacity according to claim 1, characterized in that: The heat dissipation through-holes (41) on the retaining frame (4) are circular or elliptical in shape, with a diameter ranging from 1 mm to 3 mm.

3. A ceramic angular contact ball bearing with high load-bearing capacity according to claim 1, characterized in that: The oil storage cavity (5) is provided with an oil filling port (52), the inner diameter of the oil filling port (52) ranges from 2 mm to 5 mm, and the oil filling port (52) is closed by a sealing cover.

4. A ceramic angular contact ball bearing with high load-bearing capacity according to claim 1, characterized in that: The oil outlet micropores (51) are opened by a laser drilling process and have a diameter ranging from 0.1 mm to 0.5 mm, and are evenly distributed according to the path of the rolling body (3).

5. A ceramic angular contact ball bearing with high load-bearing capacity according to claim 1, characterized in that: The retaining frame (4) is provided with a plurality of holes for accommodating rolling bodies (3), and each hole accommodates one rolling body (3).

6. A ceramic angular contact ball bearing with high load-bearing capacity according to claim 1, characterized in that: The rolling bodies (3) are arranged in a double-row staggered manner, and the angle between adjacent rolling bodies (3) is 45°.

7. A ceramic angular contact ball bearing with high load-bearing capacity according to claim 1, characterized in that: The preparation process of the rolling element (3) is as follows: Step 1: Rolling element (3) material selection and pretreatment, select silicon nitride ceramic as the rolling element (3) material, with a hardness of not less than 1500HV and a density of 3.2-3.3g / cm 3 The raw materials are cleaned and roughened, surface impurities are removed by ultrasonic cleaning, and the surface of the rolling element (3) is microstructured by chemical etching technology to increase the surface roughness to Ra0.8-1.5μm; Step 2: Rolling body (3) is formed by cold isostatic pressing to prepare a rolling body blank, with the forming pressure controlled at 200-300 MPa and the blank density reaching more than 95% of the theoretical density; the blank is then placed in a high-temperature sintering furnace for sintering at a temperature of 1700-1800°C, a holding time of 2-4 hours, and a cooling rate of 5-10°C / min; Step 3: Processing of the rolling element (3): The sintered rolling element (3) is processed by CNC grinding process, using a diamond grinding wheel with a linear speed of 20-30 m / s and a feed rate of 0.05-0.1 mm / min; the hyperboloidal surface of the rolling element is processed by a multi-axis linkage machine tool to ensure that the dimensional deviation of the rolling element (3) is less than ±2 μm and the roundness error does not exceed 0.5 μm; Step 4: Design the arrangement of the rolling elements (3). The rolling elements (3) are assembled in a double-row staggered arrangement, with the angle between adjacent rolling elements set to 45°. The rolling elements are fixed in position by a retainer (4). The inner side of the retainer (4) is provided with a hole that matches the outer diameter of the rolling element. The hole depth is 0.1-0.2 mm, and the width is 0.05-0.1 mm larger than the diameter of the rolling element (3). Step 5: Assembling the rolling elements (3). The arranged rolling elements (3) are sequentially installed between the inner ring (2) and the outer ring (1) of the bearing. During the assembly process, low-viscosity lubricant is used for pre-lubrication. The viscosity of the lubricant is in the range of 10-20 cSt. The assembly pressure is applied by a hydraulic device with a pressure value of 50-100N. The assembly speed is controlled at 0.5-1 mm / s. Step 6: Final inspection and adjustment: Perform a dynamic balance test on the assembled rolling element (3) at a test speed of 5000-10000 rpm, and record the vibration amplitude and frequency of the rolling element (3) during operation.

8. A ceramic angular contact ball bearing with high load-bearing capacity according to claim 7, characterized in that: The silicon nitride ceramic material in step 1 is added with yttrium oxide having a mass fraction of 0.5%-1% as a sintering aid.

9. A ceramic angular contact ball bearing with high load-bearing capacity according to claim 7, characterized in that: The low-viscosity lubricating oil used in step 5 is added with nano-scale molybdenum disulfide particles with a mass fraction of 0.1%-0.3%.

10. A ceramic angular contact ball bearing with high load-bearing capacity according to claim 7, characterized in that: The step six also includes performing a fatigue life assessment on the rolling element (3), with the test load being 1.2 times the rated load and the test time being 100 hours, and eliminating rolling elements with a fatigue life of less than 5000 hours.

Images