Self-compensating fluid hydrostatic bearing

Abstract

The invention relates to a self-compensating fluid hydrostatic bearing which comprises a rotor and a bearing sleeve, wherein the bearing sleeve comprises a sleeve body and a cylindrical throttling ring sheathed in the sleeve body; the two end faces of the sleeve body are second conical end faces, and the outer surface of the cylindrical throttling ring is a second cylindrical face which forms an acute angle with the second taper end faces; the rotor comprises a shock insulator and conical bodies respectively arranged on the two ends of the sleeve body, wherein the shock insulator is hollowly sheathed in the cylindrical throttling ring, and an oil storage chamber is formed between the shock insulator and the cylindrical throttling ring; two conical bodies are connected into a whole by the shock insulator, each conical body is provided with a first conical end face, and the inner side of each conical body is provided with a first cylindrical face which forms an acute angle with the first conical end face; the second conical end face or the first conical end face is provided with a bearing oil chamber, and the second cylindrical face or the first cylindrical face is provided with a throttling unit; and the sleeve body is provided with an oil supply hole and an oil drain hole, wherein the oil supply hole is communicated with the oil storage chamber, the oil storage chamber is communicated with the throttling unit by virtue of the end part of the cylindrical throttling ring, the throttling unit is communicated with the bearing oil chamber, and the bearing oil chamber is communicated with the oil drain hole. The bearing provided by the invention has the advantages of simple structure, good throttling effect, good bearing capacity, and high rigidity.

Description

technical field [0001] The invention relates to the field of sliding bearings, in particular to self-compensating hydrostatic bearings. Background technique [0002] Three throttling modes are proposed in the existing hydrostatic (including hydrostatic and gas static pressure) technologies, fixed throttling, variable throttling and self-compensating throttling. Small hole restrictors, capillary restrictors, porous restrictors, etc. are all fixed restrictors. For hydrostatic bearings using the principle of fixed throttling, on the premise of keeping the oil supply pressure constant, reducing the throttling gap and using a throttle with a smaller diameter is the main way to improve the stiffness of the bearing. This type of bearing is subject to processing levels. constraints. Variable throttling starts from changing the flow resistance of the fluid passing through the restrictor, and realizes variable pressure difference by variable flow resistance, thereby obtaining higher...

AI Technical Summary

Problems solved by technology

However, in traditional self-compensating hydrostatic bearings, the throttling unit and the corresponding bearing oil chamber are arranged on the inner wall of a cylinder, and multiple throttling units and the bearing oil chamber are arranged at intervals, which requires processing a long Surface grooves or external passages are used to connect the corresponding throttling unit and the bearing oil chamber. Due to the long surface grooves or external passages, the fluid pressure loss is very large, which directly leads to the reduction of the throttling effect and is also prone to passage blockage.

Kane et al. of the Massachusetts Institute of Technology proposed a self-compensating method of throttling by using mutually acute-angled surfaces. However, since the throttling gap is a simple annular communication area, the diffusion effect of the lubricating oil is unavoidable, which affects the overall performance of the bearing.

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