| 摘要 |
PURPOSE:To directly pressing a valve body to a valve seat with the magnetic force and therefore ensure the stable pressing force by forming the valve body as an initial pressing means from permanent magnet and placing another permanent magnet opposed to the valve body. CONSTITUTION:When no electric current flows across a solenoid 6, a permanent magnet making up a valve body 1 forms the magnetic flux of which the magnetic current flows across the valve seat 2, a piston rod 3 and a case 8, on account of which the valve body 1 is magnetically attracted to the valve seat 2. The reaction force is generated between the valve body 1 and a stopper 10 with their same poles faced to each other as such S to S and N to N so that the valve body 1 is excited. When the piston makes friction movement, the pressure of working oil in a case 8 acting the valve body 1 via a slot 5 is increased. Meanwhile, when the solenoid 6 is electrified, the magnetic flux flowing via the valve body 1 is strengthened and accordingly the generated attenuation force of the damper is varied. |
