Method for determining shape of semi-floating supporting bearing inner bore oil wedge of supercharger

Abstract

The invention discloses a method for determining the shape of a semi-floating supporting bearing inner bore oil wedge of a supercharger. The method is characterized by comprising the following steps: drawing two concentric circles which are concentric with an axle with the radius of Rb and R2 according to the limited conditions of the value of a1 and b, and axle radius Rs, the base radius of the bearing inner bore (Rb=Rs+b), and the axis distance (R2=Rs+a1) of the deepest point distance axle manufactured on the inner wall of the supporting bearing; dividing the two concentric circles into n equal parts according to the number n of oil wedges; and connecting 2n along ents sequentially by virtue of a curve, wherein the polar equation of the curve is rho=Rm+e*sin(n*t) or rho=Rm+e*cos(n*t), and the curve is in the shape of the supporting bearing inner bore oil wedges. According to the invention, a more simple method is used for designing and describing the oil wedges of the bearing inner wall, not only can the limiting requirement of the bearing design be satisfied, but also the design and drawing difficulty is reduced, the drawing label is simplified, the manufacturing difficulty is reduced, and the consistency of the appearance of the product is ensured.

Description

technical field [0001] The invention relates to a semi-floating support bearing, in particular to a method for determining the shape of an oil wedge in an inner hole of a supercharger semi-floating support bearing, and belongs to the technical field of support bearings. Background technique [0002] With the continuous increase of the speed of the supercharger and the continuous improvement of the pressure ratio, the stress on the supercharger bearing and the linear speed of the bearing are increasing. Therefore, the newly developed supercharger has basically adopted sliding bearings. [0003] The gravity of the rotor of the supercharger needs to be offset by the oil wedge formed between the radial support sliding bearing and the shaft during operation. Due to the high rotor speed and light weight of superchargers, especially small superchargers, the design focuses more on reducing the relative speed between the bearing and the shaft. Therefore, a floating support bearing (f...

AI Technical Summary

Problems solved by technology

However, due to its configuration characteristics, it is difficult to design and process. Even if the machine tools, tools, tooling and process capabilities are strong, due to the inevitable accumulation of process size errors, shape tolerances, approximate tangency of eccentric circles, tool and equipment vibration, etc. Influenced by factors, whether the processed bearing inner wall is a single piece of three oil wedges or a batch of oil wedges compared with each other, the appearance quality is not easy to control, and the consistency is poor. Even an error of 0.001mm will cause up to several millimeters of appearance difference

The oil wedge generated by two arcs tangent, due to the inconsistency of the radius of curvature of the arcs, will theoretically produce a clear straight arc intersection line, but in actual processing, even if the accuracy of all processes is controlled at 0.01mm or even 0.005mm, due to the influence of the aforementioned factors, the actual processing line, the line itself is blurred, and it is not straight at the same time, and the three oil wedges are not even when compared with each other

[0010] At present, when some manufacturers manufacture bearings with similar structures, for the sake of manufacturing convenience, more single eccentric circle design methods are used, which partially meet the requirements of bearing design. Although it is easy to manufacture, it sacrifices the design life.

The bearings processed with the design method of two eccentric circles are used in products with good performance and can meet the design requirements. However, as mentioned above, the design and processing requirements are high, which will greatly increase the production cost.

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