| 摘要 |
PURPOSE:To lessen delay in the responsiveness of damping force by making up an orifice mutually connecting a first and a second auxiliary oil chamber, out of a throttle hole formed in a switch-over valve, and of a mushroom valve body provided for a plunger in a damper operated by the exciting current of a linear solenoid. CONSTITUTION:At the time of compression of a damper 18, the working oil of a high pressure side main oil chamber 54 flows into a first auxiliary oil chamber 68 from a check valve 76 at the early stage of compression, and it then flows in a second auxiliary oil chamber 70 through a gap between the throttle hole 72a of an orifice 72 and a valve body 72b. The hydraulic pressure of the first auxiliary oil chamber 68 is exerted on the upper surface of the valve body 72b, so that it thereby pushes a plunger 82 down, which is integrated with valve body 72b, against the pressure of a linear solenoid 80. When the plunger 82 is lowered down the pressure of the second auxiliary oil chamber 70 runs away to a low pressure side main oil chamber 56 through a check valve 84, and a switchover valve 66 falls dawn at high speeds with the pressure difference increased between the upper and lower surfaces of the switch-over valve 66, so that the high pressure side main oil chamber 54 is thereby communicated with the lower pressure side main oil chamber 56 through oil passages 88 and 90. When the pressure difference between both of the main oil chambers 54 and 56 is decreased, both of the switch-over valve 66 and the plunger 82 are lifted up, so that the passages 88 and 90 are thereby interrupted. During compression, the switch-over valve 66 is vertically moved repeatedly. |
