| 摘要 |
The present invention relates to a groove type continuance variable oil damper which is installed inside a washing machine and which relieves impact and reduces vibration generated inside the washing machine while a piston (20) moves back and forth in a cylinder (10). The diameter of the cylinder (10) in which the piston (20) moves back and forth is convertible. The shape of the cylinder (10) in which the diameter of the cylinder (10) is convertible is composed of an upper horizontal part (11) of which the diameter from the upper side of the cylinder (10) to a predetermined section is even; an increase part (12) of which the diameter is increased from the upper horizontal part (11); an expanded horizontal part (13) of which the diameter is expanded from the increase part (12); a decrease part (14) of which the diameter is decreased from the expanded horizontal part (13); and a lower horizontal part (15) of which the diameter becomes even from the decrease part like that of the upper horizontal part (11). Since the damping force of the cylinder in the present invention is variable depending on the back and forth movement of the piston, vibration is reduced and impact is relieved so that the number of rotation of a drum of the washing machine can be increased, thereby drastically reducing washing time. |
