An aerostatic bearing for a free-piston reciprocating machine

A technology of reciprocating motion and gas static pressure, applied in the direction of bearings, shafts and bearings, mechanical equipment, etc., can solve the problems of increased gas consumption of gas static pressure bearings and reduced mechanical efficiency of free piston reciprocating motion, so as to improve efficiency and load bearing Improved capacity and rigidity, reduced air consumption
CN103939467BActive Publication Date: 2017-04-12CHINA ELECTRONICS TECH GROUP CORP NO 16 INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA ELECTRONICS TECH GROUP CORP NO 16 INST
Publication Date
2017-04-12

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Abstract

The invention relates to an air hydrostatic bearing of a machine making free piston type reciprocating motion. The air hydrostatic bearing comprises a piston, a cylinder, a discharger, a compressing cavity and an air storage groove, wherein a first orifice, a first annular shallow groove and a first pressure equalizing shallow groove are formed in the outer side of the outer circumference of the outer sleeve of the piston along the circumferential direction; the first pressure equalizing shallow groove is communicated with the first annular shallow groove at two sides of the first orifice; the first orifice is communicated with the first annular shallow groove through the first pressure equalizing shallow groove; double-row second orifices are formed in the outer side of the outer circumference of the inner sleeve of the piston along the circumferential direction; a second annular shallow groove and a second pressure equalizing shallow groove are formed in the inner side of the inner circumference; the second pressure equalizing shallow groove is communicated with the second annular shallow groove at two sides of the second orifices; and the second orifices are communicated with the second annular shallow groove through the second pressure equalizing shallow groove. The bearing capacity and air film rigidity of the air hydrostatic bearing are improved, the service life of the piston is prolonged, the air consumption is lowered and the efficiency of the machine making free piston type reciprocating motion is increased.
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Description

technical field

[0001] The invention relates to the technical field of gas static pressure bearings, in particular to a gas static pressure bearing used in a free-piston type reciprocating motion machine. Background technique

[0002] The gas static pressure bearing is a key part of the free piston, which reduces the friction loss between the piston and the cylinder by means of gas lubrication, and prolongs the service life of the piston. The performance of the gas static pressure bearing will directly affect the length of the service life of the piston, and the carrying capacity and the stiffness of the air film are important indicators to judge the performance of the gas static pressure bearing. The load capacity and gas film stiffness of gas hydrostatic bearings are closely related to the bearing structure and gas throttling method.

[0003] At present, the common gas throttling methods of gas static pressure bearings include small hole throttling type, porous type and s...

Claims

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