Other

Atushi Imai

Tatsuo Goda

Akira Imai

Yutaka Imai

Atsushi Imai

A fluid pressure nuthas a first load supporting memberdisposed in a flangeand a second load supporting memberaxially movably attached to the first load supporting memberwherein the second load supporting memberis screw-connected to a boltin a screw holeA pressure chamber is provided between the first load supporting memberand the second load supporting memberand a seal ringis attached to an end portion of a pressure chamberThe seal ringincludes a first curve portion contacting with the first load supporting membera second curve portion contacting with the second load supporting memberand a pressure receiving portion continuing into the first and second curve portions, wherein pressure applied to the pressure receiving portion is converted into axial-directional sealing forces of the curve portions.

Fluid pressure device

A first load-receiving member having a cylinder and a screw hole through which a bolt is thread-engaged and a second load-receiving member having a piston and a fastening face that is made in contact with a member to be fastened are attached to a nut, and a number of balls made of steel the surface of which is lubricated by grease are loaded into a pressure chamber that is formed as a compartment by the cylinder and the piston. Since these balls exert fluidity in the pressure chamber, a load applied to the balls is transmitted to the cylinder and the piston through the balls by screwing the input bolt. Thus, the first load-receiving member is moved in the axis direction with respect to the second load-receiving member, thereby applying a tensile force to the bolt.

Growing community of inventors

Tokyo, Japan

Tatsuo Goda