High pressure big angle-wrap porous section-variable closed type air-floating ball bearing

Abstract

The present invention relates to a high pressure large wrap angle running-in type porous variable section closing air floating ball bearing which is composed of a ball head, a ball socket, an air feed locker, a position sleeve and a fixing sleeve. The ball socket is disposed with single row or multiple rows of air intake channels, air discharge uniform pressure grooves, first air intake holes and second air discharge holes. The air feed locker, the position sleeve and the fixing sleeve are assembled in the air intake channel. The air enters the bearing air film gap through the flow channel formed by the air intake channel to supply support force which is balance with the outer load acted on the ball head. The air feed locker is composed of a curved surface gradually expanding mixing chamber or a cone surface graduallyexpanding mixing chamber and the air intake small holes. The beneficial effect of the invention is that: the bearing area is increased and the bearing force is greatly improved. The air feed locker can be disassembled conveniently, the pressure dive phenomenon at the transition place of the air intake channel and the air film will be improved under the working condition of high pressure and air film, the bearing force is far more than conventional air floating ball bearing. The bearing is adapted to ground air floating simulation equipments that need heavy load, precision heavy machine, measure device and large space structure.

Description

Technical field [0001] The invention relates to the technical field of static pressure gas ball bearings. It is a high-pressure large-wrap angle running-in porous variable cross-section closed-type air-floating ball bearing, suitable for precision heavy machinery, measuring equipment, and large-scale space structures that require heavy load and high rigidity. Air flotation simulation equipment, etc. Background technique [0002] Gas bearings with traditional structures have two main disadvantages: one is low air supply pressure, low bearing capacity, and low stiffness; the other is poor stability. As the air supply pressure increases, the dynamic characteristics of the bearing deteriorate and the gas film appears Negative dynamic damping causes its instability. These two deficiencies make the traditional structure of gas bearings can only be used for light-load precision support. However, with the development of modern cutting-edge technology, especially in the aerospace industr...

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Problems solved by technology

[0002] There are two main disadvantages in the gas bearing of the traditional structure: one is low gas supply pressure, low bearing capacity and low stiffness; Negative dynamic damping, causing it to destabilize

The deficiencies in these two aspects make the gas bearing of the traditional structure only used for light-load precision support. However, with the development of modern cutting-edge technology, especially in the aerospace industry for full-star full-scale physical simulation tests on large satellites, its main components It is to provide gas ball bearings that can withstand heavy loads in a low-friction environment. If the traditional low-pressure small-angle air supply bearings are used, the diameter of the ball needs to be large, which increases the manufacturing cost and difficulty.

And when the bearing works at subsonic speed, with the increase of air supply pressure, the bearing capacity will increase; when the air supply pressure is further increased, supersonic flow and negative pressure area will appear in the air gap, and the bearing capacity of the bearing will drop significantly at this time , and even negative carrying capacity may occur

Therefore, gas bearing designers often use the principle of not supersonic flow in the bearing gap as the design principle of the gas bearing working parameters, that is, the gas bearing must work at subsonic speed. are lower, generally not greater than 6×10 5 N / m 2 , which greatly limits its application in the field of overloading

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