Hydraulic cylinder sealing - has two overlaid sealing rings within grooves round pistons to be pressed by hydraulic pressure against inner cylinder walls

摘要

The sealing for a telescopic hydraulic cylinder assembly has open ring grooves (8,9) round the circumference of the cylindrical pistons (4,5) to take two overlaid sealing rings (10,11;12,13) in each, with round cross sections. The grooves (8,9), with a horizontal width greater than the dia. of the sealing rings (10,11;12,13) are linked by channel passages (7,14;15,16) through them with the hydraulic water supply so that the water pressure forces the sealing rings (10,11;12,13) against the inner walls of the outer hydraulic cylinders (1,2). The sealing rings (10,11;12,13) are of an elastic chloroprene polymerisate with a Shore A hardness of 80. USE/ADVANTAGE - The sealing is for telescopic hydraulic cylinders containing pistons. The sealing system is simple, requires little maintenance, and gives a reliable operation.