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Active static pressure gas thrust bearing

A thrust bearing and gas technology, applied in the field of machinery, can solve problems such as bearing stiffness reduction

Pending Publication Date: 2021-07-30
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Small hole throttle static pressure gas bearings are widely used and have high stiffness. However, the high stiffness, especially the maximum stiffness, of small hole throttle static pressure gas bearings can only be maintained at a very small gas film thickness. area, once the air film thickness is not in this area, the stiffness of the bearing will be significantly reduced

Method used

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  • Active static pressure gas thrust bearing
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  • Active static pressure gas thrust bearing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] figure 1 A bearing structure for the present invention; Figure 4 The partial structure of the active control system composed of piezoelectric ceramic pieces 6 and T-shaped adjusted rod 7, by deformation of the piezoelectric ceramic sheet 6, the upper and lower motion of the T-shaped adjustment rod 7 is realized to achieve a real time to the average pressure 4 volume. Control, and make the bearings in the thickness of the gas film constant or only micro variation, the bearing capacity has also changed significantly, thereby obtaining a high stiffness of the bearing.

Embodiment 2

[0030] The present embodiment is similar to the basic structure of the first embodiment, and in the case where the surface center is opened, the groove 8 is formed, and the active control system for placing the piezoelectric ceramic sheet 6 and the T-adjust rod 7 is controlled by control. Deformation of the piezoelectric ceramic sheet 6 drives the movement of the T-shaped adjusted rod 7 to achieve real-time control of the volume of the homogeneous cavity, so that the bearing obtains high stiffness, such as image 3 Indicated.

Embodiment 3

[0032] The present embodiment is similar to the basic structure of the first embodiment, and the bottom surface is provided in the bottom surface of the present embodiment, and the peripheral circle is 3 holes, and the adjacent two hole center and the center of the bearing center. 120 °, such as Figure 5 Indicated.

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PUM

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Abstract

The invention discloses an active static pressure gas thrust bearing. The active static pressure gas thrust bearing comprises a bearing body, a small hole throttler is installed on the bearing body, the small hole throttler comprises a throttling hole, a pressure equalizing cavity is formed in the gas outlet end of the throttling hole, the throttling hole and the pressure equalizing cavity form a pressure equalizing structure, an adjusting rod in close fit with the throttling hole is installed in the throttling hole and connected to a piezoelectric ceramic piece, the piezoelectric ceramic piece is fixedly connected to the bearing body, the piezoelectric ceramic piece drives the adjusting rod to move in the axial direction of the throttling hole, the volume of a pressure equalizing structure is adjusted, and therefore the bearing capacity of the bearing is adjusted. According to the active static pressure gas thrust bearing, the volume of the pressure equalizing cavity is adjusted in real time through vertical movement of the T-shaped adjusting rod, the bearing capacity of the bearing can be directly changed due to the change of the volume of the pressure equalizing cavity, and the bearing capacity of the bearing can be obviously changed when the thickness of a gas film is not changed or only slightly changed, so that the bearing obtains high rigidity, and the method is suitable for any gas film thickness, so that the bearing can obtain a high-rigidity effect of a wide gas film thickness change area.

Description

Technical field [0001] The present invention belongs to the field of mechanical, and more particularly to an active static pressure gas thrust bearing. Background technique [0002] Ultra-precision machining requires the bearing with high hardness performance. The stronger the ability of the bearing resistance to the external load or impact change, the smaller the thickness of the gas film caused by the change in outer load changes, the smaller the corresponding amplitude, so that the processing error is made Decrease. The small hole throttle pressure gas bearing has a wide range of applications, with high rigidity, but the high rigidity of the small hole throstatic gas bearing is in particular the maximum stiffness, usually only holds a very small gas film thickness. Region, once the thickness of the gas film is not in this area, the rigidity of the bearing will be significantly reduced. Therefore, in order to meet the needs of ultra-precision machining, an urgent need to find a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C32/06
CPCF16C32/0622
Inventor 李文俊王国庆冯凯王鹏张英杰
Owner HUNAN UNIV