| 摘要 |
PURPOSE:To enable spring constant to be varied at two steps by opening and closing a through-hole, which communicates both fluid chambers formed inside a bush with each other by means of a solenoid valve. CONSTITUTION:A middle cylinder 4 is disposed between an internal cylinder 2 and an external cylinder 3 in such a manner that their respective axes have a concentric relation to each other. The space between the internal cylinder 2 and the middle cylinder 4 is divided by rubber walls 5 and 6, thereby defining fluid chambers 11 and 12. A fluid chamber 13 between the internal cylinder 2 and the middle cylinder 4 is communicated with each of the fluid chambers 11 and 12 by through-holes 14 and 15, which are formed in the middle cylinder 4. The through-holes 14 and 15 are opened and closed by a solenoid valve which consists of a valve body 23 and solenoids 21 and 22 which are disposed between the internal cylinder 2 and the middle cylinder 4, whereby enabling spring constant to be varied at two steps of high and low values. |
