Mixed type helical groove dynamical and static pressure gas composite cylindrical bearing

Abstract

The "hybrid spiral groove dynamic and static pressure gas composite cylindrical bearing" of the present invention relates to a high-speed, high rigidity, large load ultra-precision spiral groove dynamic and static pressure gas composite cylindrical bearing. On the working surface of the cylindrical bearing, the distribution of static pressure air flotation gas supply points There are herringbone dynamic pressure grooves on both sides of the circle. Without increasing the air consumption of the air bearing, the bearing capacity is increased by more than 30% compared with the traditional static pressure air bearing, and the bearing stiffness is 15% higher than that of the traditional static pressure air bearing. %above.

Description

technical field [0001] The invention relates to a dynamic and static pressure gas composite cylindrical bearing, especially an ultra-precision and ultra-high-speed gas cylindrical bearing. Background technique [0002] At present, the static pressure gas cylindrical bearings used in engineering, such as: high-speed static pressure air bearing electric spindle and other high-speed static pressure gas bearings, only use the static pressure air bearing to bear the load and provide stiffness, which are often encountered in practical applications. Due to the problems of low load-carrying capacity, low stiffness, and poor anti-interference ability, the hydrostatic gas cylinder bearings used in engineering do not make full use of the load-carrying capacity and stiffness that can be provided by the dynamic pressure effect of high speed or line speed ("Mechanical Design Manual" Volume II, Part Seven—Gas Lubricated Bearings. Fourth Edition, 2002, Chemical Industry Press; "Mechanical D...

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Problems solved by technology

[0002] At present, the static pressure gas cylindrical bearings used in engineering, such as: high-speed static pressure air bearing electric spindle and other high-speed static pressure gas bearings, only use the static pressure air bearing to bear the load and provide stiffness, which are often encountered in practical applications. Due to the problems of low load-carrying capacity, low stiffness, and poor anti-interference ability, the hydrostatic gas cylinder bearings used in engineering do not make full use of the load-carrying capacity and stiffness that can be provided by the dynamic pressure effect of high speed or line speed ("Mechanical Design Manual" Volume II, Part Seven—Gas Lubricated Bearings. Fourth Edition, 2002, Chemical Industry Press; "Mechanical Design Manual", Volume Four, Chapter Nine, Chapter 40—Gas Bearings. Second Edition, 2003, Machinery Industry Press society.)

Utility model patent (application number: 87 2 15713) "herringbone groove dynamic and static pressure hybrid gas bearing" does not use sealing edge and pressure equalization groove, which reduces the static pressure performance: utility model patent (patent number: 94207681.8) "π-shaped The groove dynamic and static pressure hybrid gas bearing "does not use the sealing edge, which reduces the static pressure performance, and the dynamic pressure effect of the straight groove in the middle is not fully utilized.

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