Hydraulic Cylinder Hydrostatic Bearing Guide Sleeve Performance Study

With the development of hydraulic technology on the performance of thehydraulic cylinder demand is higher and higher, From the hydraulic cylinder structurecan be seen, Influence the improvement of the performance of the hydraulic cylinderdynamic and reduce friction, mainly in two parts: one is the piston and cylinder wall,the other is the piston rod and guide sleeve, if the two parts of the performance isimproved, can greatly improve the overall performance of the hydraulic cylinder. Basedon the study of piston rod and guide sleeve sealing, Under in Wuhan university ofscience and technology cooperation project "servo hydraulic cylinder seal clearance" f,the piston rod and guide sleeve of the static pressure support technology, mainly donethe following work. The piston rod and guide sleeve of the static pressure supporttechnology, The main contents are as follows:The paper analyzed the structure and performance of servo hydraulic cylinder, andpointed out that the existing technology of servo cylinder uses seals to achieve seal thatleaded to poor low-speed stability performance and big friction and had a seriousimpact on the improvement of the frequency characteristics of the servo cylinder.Clearance seal technology can obtain small friction, but the oil film pressure is not easyto form in low speed. In view of this, In this paper a kind of glyph oil cavity in theguide sleeve and through external drainage of static pressure support technology, Thiskind of servo hydraulic cylinder has a small friction, high frequency response, highreliability, long life, prevent leakage, is conducive to the piston action, simple structureand so on.Firstly, studied the structure of I-section oil cavity Combined with bearing groove,analyze the flow field characteristics. Use Pro/e to finish modeling the flow field of thehydrostatic support seal and divide structured grid of the flow field by Gambit. Then,by using Fluent software contrastive Analysis the static pressure bearing guide sleevestarts glyph rectangular oil and oil cavity of the oil film,From the pressuredistribution, i-section cavity can form the relatively stable bearing oil cavity pressure,And when combined with bearing groove can form two360°pressure support ring,In favor of piston rod and the piston rod pair. Comparison and analysis the differentdriving oil cavity in friction and leakage, the friction and velocity of the pistonrod withthe piston rod leakage of eccentricity.