Metal self-lubrication piston ring

Abstract

The invention belongs to the field of fluid motive sealing and particularly relates to a metal self-lubrication piston ring. A plurality of arc grooves are evenly formed in the front sealing face and the back sealing face of a piston ring body respectively, and accordingly a thermal fluid dynamic force wedge effect is generated, the sealing performance of the piston ring is improved, sealing face lubricating performance is improved, liquid flows in a circulating mode along with the arc grooves, and radiating performance is good. In addition, the piston body is made of CuSn95C5 materials, the elasticity, the fatigue resistance, the abrasive resistance, the machinability and the self-lubricating anti-attrition performance of the piston ring body are greatly improved.

Description

technical field [0001] The invention belongs to the field of fluid dynamic sealing, and relates to an expansion ring, in particular to a metal self-lubricating expansion ring. Background technique [0002] The existing expansion rings are mainly used in aerospace, engineering machinery, military vehicles, metallurgical machinery and other system devices. They are key components of the transmission system. If the expansion rings are damaged, the hydraulic control system will fail, resulting in control failure. At present, the high power density of vehicle power and transmission structure is an important development direction of modern vehicles, which requires the realization of large engine power and its power transmission capacity in a small volume space. The effective way to achieve this feature is to increase the speed as much as possible. In this case, the linear speed of the transmission element and the expansion ring will be doubled. The clutch of the transmission syst...

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Problems solved by technology

[0003] The Chinese Patent No. (CN202194829U) discloses a new sealing ring for Roots blower. The surface material of the ring is carbon fiber reinforced plastic, but the material has low mechanical strength and is easily deformed and linearly expanded after being loaded. Large coefficient, not suitable for working environment with high PV value

[0004] In addition, as described in literatures such as "Expanding Ring Type Rotary Sealing Device and Its Performance Research" and "Transmission Device Dynamic Seal Failure Analysis and Experimental Research", at present, the expanding ring generally has rectangular launders evenly distributed on the two end faces. It is connected to both sides of the sealing ring, and part of the fluid is released from the flow groove. During the starting process, it is difficult to form a strong hydrodynamic pressure effect, especially in a high-pressure environment, high-pressure liquid or impurity particles are easy to leak through the dynamic pressure lubrication film, and The trough has insufficient liquid circulation and poor cooling of the trough edge

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