Patent Number: 6,293,377

Title: Variable-damping force shock absorber

Abstract: An actuator disposed within a piston rod of a variable-damping force shock absorber has coils mounted at an inner peripheral face of the piston rod, permanent magnets disposed facing a stator, and a cylindrical body supported rotatably about the piston rod axis. The permanent magnets are fixed to a side face of an upper portion of the cylindrical rotating body and an insert hole into which an upper end portion of a shaft is inserted extends through a lower portion of the rotating body. A female thread is formed in the insert hole, and engaged with a male thread formed on an outer peripheral face of the upper end portion of the shaft. A spool is mounted on a lower end portion of the shaft so that, as the rotating body rotates, the spool moves in the direction of the piston rod axis and thereby changes the opening of a communication passage between upper and lower chambers of a cylinder. The piston rod of the variable-damping force shock absorber has a reduced diameter.

Inventors: Okada; Yoshimasa (Okazaki, JP), Kamimura; Ichisei (Okazaki, JP), Kono; Kiyoshi (Oogaki, JP)

Assignee: Toyota Jidosha Kabushiki Kaisha

International Classification: F16F 9/32 (20060101); F16F 9/46 (20060101); F16F 9/34 (20060101); F16F 9/348 (20060101); F16F 9/44 (20060101); F16F 009/46 ()

Expiration Date: 09/25/2018