Dynamic damper, vibration isolator, and method of manufacturing magnetic viscoelastic elastomer

摘要

A movable part (17) movable by an external input and an exciting coil (14) for generating a magnetic field having a strength corresponding to the supplied current are provided. The movable portion (17) includes first and second magnetic cores (11) and (12) that form a magnetic path that is a path of a magnetic field generated by the excitation coil (14) as an annular closed magnetic path, and an excitation coil ( 14) includes a magneto-viscoelastic elastomer (13) whose viscoelastic properties change according to the magnitude of the magnetic field generated. The magnetic viscoelastic elastomer (13) is disposed so as to form a closed magnetic circuit by connecting at least one portion between the first and second magnetic cores (11), (12).