PGW type piston sealing ring

Abstract

The invention discloses a PGW type piston sealing ring comprising a PU (polyurethane) sliding ring. A bulge increasing the sealing effect is formed in each of the two sides of the periphery of the PU sliding ring. Oil guiding grooves which enable oil to flow more smoothly are formed in the side faces of the PU sliding ring. The sliding ring is formed by integral injection moulding. According to the PGW type piston sealing ring, the sealing effect is increased through the two bulges added on the periphery of the PU sliding ring; the oil guiding grooves of the sides of the PU sliding ring enable the oil to flow more smoothly, and the impact of the oil pressure on a sealing piece is buffered; compared with a PGA type piston seal, the PGW type piston sealing ring has the better pressure maintaining effect; and meanwhile, the integral injection moulding mode is adopted instead of a traditional turning machining mode, and the production efficiency is improved through the change of the machining mode.

Description

technical field [0001] The invention relates to the technical field of a plastic-sealed piston sealing ring, in particular to a PGW type piston sealing ring. Background technique [0002] At present, in hydraulic cylinders or pneumatic cylinders, the working principle of the sealing ring applied to the piston is usually to form a seal by deforming the sealing ring when it is squeezed. On the sealing ring of some structures, the contact surface between the sealing ring and the cylinder body is large, and the frictional resistance is too large under the action of pressure. Excessive frictional resistance is likely to cause premature wear and failure of the sealing ring, resulting in shortened life of the sealing ring; some The structure of the sealing assembly is complex, the manufacturing cost is high, and all parts need to be replaced when the seal is replaced, which increases the cost of use and is not conducive to widespread use. Additionally, if figure 2 As shown, the s...

AI Technical Summary

Problems solved by technology

On the sealing ring of some structures, the contact surface between the sealing ring and the cylinder body is large, and the frictional resistance is too large under the action of pressure. Excessive frictional resistance is likely to cause premature wear and failure of the sealing ring, resulting in shortened life of the sealing ring; some The structure of the seal assembly is complicated, the manufacturing cost is high, and all parts need to be replaced when the seal is replaced, which increases the cost of use and is not conducive to widespread use

Additionally, if figure 2 As shown, the sealing ring 4 in the prior art generally has a structure in which both sides are flat and the outer peripheral surface is also flat. When the side is flat, it is not conducive to the smooth flow of oil, causing a large hindrance to oil flow, and its outer peripheral surface is also flat. Planar structure, its sealing effect is average, and the sealing is not strong

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