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Static pressure gas floating axial bearing

A technology of axial bearings and bearings, which is applied in the direction of air cushion bearings, shafts and bearings, bearings, etc., can solve the problems of difficult bearing manufacturing, insufficient reliability, and synchronous improvement of stiffness and stability, etc., to achieve low manufacturing cost and high rigidity. Simultaneously improved with stability, the effect of suppressing the generation of redundant gas

Pending Publication Date: 2019-08-06
INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the rigidity and stability of the small hole throttling static pressure gas axial bearing in the prior art cannot be simultaneously improved, and at the same time overcome the problems of insufficient reliability of the porous throttling air bearing and the difficulty in manufacturing the bearing, the present invention proposes a viscous - Hydrostatic air bearing axial bearing with inertia coupling throttling

Method used

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  • Static pressure gas floating axial bearing
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Embodiment 1

[0022] figure 1 It is a schematic diagram of the overall structure of the visco-inertial coupled throttling hydrostatic air-bearing axial bearing of the present invention; figure 1 Among them, the viscous-inertial coupling throttling hydrostatic air bearing axial bearing of the present invention includes a rotor 1 and a bearing thrust plate 2, and its connection relationship is that the rotor 1 is above the bearing thrust plate 2, and the diameter of the rotor 1 is smaller than that of the bearing The diameter of the thrust plate 2; the rotor 1 can move upward to a certain displacement when supplying air, so that its lower surface and the upper surface of the bearing thrust plate 2 form a certain (8-40um) air film 3. The thickness of the air film 3 is as follows figure 1 shown. Several first through holes 4 are opened along the circumferential direction on the bearing thrust plate 2; a cylindrical porous structure 5 is embedded in the first through holes 4; The center of the...

Embodiment 2

[0030] The structure of this embodiment is the same as that of Embodiment 1, except that the annular pressure equalizing chamber 11 is not provided in this embodiment, and the distance between the upper surface 6 of the cylindrical porous structure and the upper surface 10 of the bearing thrust plate is zero.

Embodiment 3

[0032] The structure of this embodiment is the same as that of Embodiment 1, except that the material of the cylindrical porous structure 5 in this embodiment is porous metal.

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Abstract

The invention discloses a static pressure gas floating axial bearing. The static pressure gas floating axial bearing comprises a rotor (1) and a bearing thrust plate (2), wherein a gas film (3) is arranged between the lower surface of the rotor (1) and the upper surface of the bearing thrust plate (2); the bearing thrust plate (2) is provided with a plurality of first through holes (4) in the circumferential direction, a cylindrical porous structure (5) is inlaid in each first through hole (4), and the interior of each cylindrical porous structure (5) is provided with a second through hole from the center of a cylindrical porous structure upper surface (6); the second through holes penetrate to cylindrical porous structure lower surfaces (12); the cylindrical porous structure lower surfaces (12) and a bearing thrust plate lower surface (13) form a gas supply hole (14) for supplying high-pressure gas. The defects that the rigidity and the stability of small hole throttling are difficult to improve are overcome, meanwhile, the problems that the reliability of porous throttling is insufficient and the machining precision requirement is high are solved, and the static pressure gas floating axial bearing has the advantages of being low in cost, stable in process, controllable in quality.

Description

technical field [0001] The invention belongs to the technical field of static pressure air bearings. In particular, the invention relates to a visco-inertia coupled throttling static pressure air bearing axial bearing. Background technique [0002] Small hole throttle static pressure gas axial bearing has the characteristics of high rotation precision, long life and no pollution, and is widely used in the field of ultra-precision machining. Bearing stiffness and stability are the main performance indicators of small-bore throttle hydrostatic gas axial bearings, and are the key to ensuring bearing accuracy and reliability. Higher bearing stiffness can be obtained by using a larger air supply pressure, but it will cause self-excited oscillation of the air hammer, resulting in the failure of the bearing to work normally. Compared with the small-hole throttle, the gas enters the gas film gap through the porous throttle, the flow state is more stable, and the critical air suppl...

Claims

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Application Information

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IPC IPC(8): F16C32/06
CPCF16C32/0618F16C32/0622
Inventor 杨光伟阳红刘有海张敏徐磊磊戴晓静孙守利尹承真
Owner INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS