| 摘要 |
PURPOSE:To obtain sufficient vibration resisting effect for wide frequency range by providing a pair of frames having wall surfaces confronting to each other, an annular wall member to form a chamber space in cooperation with the wall surfaces of the frames, and a stopper member for resisting the compression of the annular wall member. CONSTITUTION:When vibration is applied to between frames 1 and 2, an annular wall member 11 is compressed to restrict the transmission of vibration with high frequency and small magnitude between the frames 1 and 2. With the compression of the member 11, air contained in a chamber space 14 enters into a chamber space 15 through an orifice 16, and the fluid resistance occured at this time leads to the attenuation effect against vibration of low frequency and medium magnitude. Further, when the annular wall member 11 is compressed to a predetermined level, its deformation is stopped by means of a stopper 19 and the orifice 16 is closed, so that the chamber space 14 constitutes an air spring and then the spring constant of a total vibration restricting rubber device is increased. Thus, vibration of low frequency and large magnitude is effectively attenuated at this time. |
