Patent ID: 7637128
Filing Date: 2009-12-29
Classification: F16F

Abstract:
1. An oil damper for a drum type washing machine comprising: a hollow cylinder having an oil chamber for filling oil therein; a tub holder fixedly secured to one end of the cylinder for securing the damper to a tub side; a shaft passed through, and exposed from the other end of the cylinder; a base holder fixedly secured to the shaft at an end thereof exposed to an outside of the cylinder for securing the damper to a base side of a cabinet; and a piston having a plurality of oil holes, for sliding inside of the cylinder; wherein at least one of above components is formed by plastic injection molding; and the cylinder includes an oil seal for preventing oil from leaking and a bushing for supporting the piston to guide a linear motion of the piston, mounted in succession on an inside of the other end of the piston, and the other end of the piston has a stepped opening having diameters different from each other in an axial direction of the cylinder, wherein the metal bushing is press fit, and secured to a small diametered portion at the innermost side of the stepped opening, and the oil seal is mounted inside of a large diametered portion at an outer side of the stepped opening.