Hybrid ceramic ball bearing on turbocharger and design method thereof

Abstract

The invention relates to a hybrid ceramic ball bearing on a turbocharger and a design method thereof. The bearing comprises an inner ring, a left outer ring and a right outer ring, ceramic balls and aretaining frame. A row of ceramic balls are respectively installed between the left outer ring and the inner ring and between the right outer ring and the inner ring; and the ceramic balls are externally provided with the retaining frame. A separation sleeve which consists of an upper part and a lower part is installed between the left outer ring and the right outer ring; and the length of the inner ring is larger than the sum of the length of the left outer ring, the right outer ring and the separation sleeve. The design of the bearing mainly comprises the steps: initially setting basic structure parameters of the bearing; counting, analyzing and determining the parameters by means of the bearing-rotor system dynamics; further optimizing the parameters; and designing a bearing engineering drawing. The invention has high mechanical efficiency, low lubrication requirement and simple structure, and can effectively improve the mechanical efficiency, the acceleration (transient response)performance, the reliability and the stability of the turbocharger.

Description

technical field [0001] The invention relates to a bearing and a design method thereof, in particular to a hybrid ceramic ball bearing used in a turbocharger and a design method thereof. Background technique [0002] At present, there are only three types of high-speed bearings that can be commercially used in automotive turbochargers: sliding bearings (single oil film), floating bearings (double oil film, including semi-floating bearings and full floating bearings), and rolling bearings (ball bearings) that have just begun to be used. ), air bearings and electromagnetic bearings are still in experimental research. [0003] The advantages of oil film lubricated bearings (including sliding bearings and floating bearings) are simple structure and low cost, which is why it is widely used today. The disadvantages are low efficiency (85% to 90%), large startup damping, and low Oil requirements are stricter. For floating bearing turbochargers, the lubricating oil is provided by t...

AI Technical Summary

Problems solved by technology

However, the small-sized inner hole raceway of the integral outer ring structure must be respectively inserted into the turning tool and grinding wheel from both ends for processing, and the position tolerance of the two raceways is difficult to guarantee

At the same time, the assembly position accuracy of the two inner ring raceways and outer ring raceways of the bearing is guaranteed by parts grouping and matching. When one assembly fails to meet the requirements, the bearing must be disassembled, and the inner ring or outer ring must be selected for reassembly. , it is easy to scratch the raceway, resulting in the scrapping of the inner or outer ring

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