Patent ID: 8610320

Claim:
A linear generator having a fluid pressure cylinder structure, comprising a cylinder having left and right end walls, and a piston reciprocally disposed in the cylinder and having left and right pressure-receiving surfaces such that a left fluid chamber is defined in the cylinder between the left end wall of the cylinder and the left pressure-receiving surface of the piston and a right fluid chamber is defined in the cylinder between the right end wall of the cylinder and the right pressure-receiving surface of the piston, in which a fluid pressure in the left fluid pressure chamber and a fluid pressure in the right fluid pressure chamber are to be alternately applied to the piston in the cylinder to reciprocate the piston in the axis direction, the linear generator further comprising: a permanent magnet band provided between the left pressure-receiving surface of the piston and the right pressure-receiving surface of the piston; an electromotive coil band provided over the left and right fluid pressure chambers and formed on a cylindrical wall between the left and right end walls of the cylinder; a fixed permanent magnet tube body disposed radially outwardly of an outer periphery of the electromotive coil band; and a fixed cylindrical yoke disposed radially outwardly of an outer periphery of the fixed permanent magnet tube body; wherein the piston having the permanent magnet band is arranged to reciprocate in the axis direction to induce power generation in the electromotive coil band; and wherein the fixed permanent magnet tube body annularly surrounds an outer periphery of the electromotive coil band, and the fixed cylindrical yoke annularly surrounds an outer periphery of the fixed permanent magnet tube body.