| 摘要 |
To provide a solenoid-type variable damper that improves piston strength prevents disconnection of the electromagnetic coil, and the like. [Solution] A piston (16) comprises a piston body (30), an expansion-side valve plate (41), a contraction-side valve plate (42), an electromagnetic coil (43), and a bolt (44). The piston body (30) is cast as a single piece and is manufactured through a powder metallurgy method, a die casting method, or the like, using a ferrite-based or other ferromagnetic material as a raw material, and comprises a cylindrical outer yoke (31) that is in slidable contact with the inner periphery of a cylinder (12); a columnar inner yoke (34), the outer periphery of which faces the inner periphery of the outer yoke (31) across first and second gaps (32, 33); and a connecting section (35) in the central part in the axial direction of the piston (16), which connects the outer yoke (31) and the inner yoke (34) and divides the first and second gaps (32, 33) from each other. The electromagnetic coil (43) is fit into the second gap (33) of the piston body (30). |
