US 7,357,229 B2
Electromagnetic shock absorber
Takuhiro Kondo, Tokyo (Japan); Hideki Yamagata, Tokyo (Japan); and Yoshihiro Suda, Tokyo (Japan)
Assigned to Kayaba Industry Co., Ltd., Tokyo (Japan); and The Foundation for the Promotion of Industrial Science, Tokyo (Japan)
Appl. No. 10/515,812
PCT Filed May 28, 2003, PCT No. PCT/JP03/06670
§ 371(c)(1), (2), (4) Date Jun. 06, 2005,
PCT Pub. No. WO03/100291, PCT Pub. Date Dec. 04, 2003.
Claims priority of application No. 2002-155080 (JP), filed on May 29, 2002; and application No. 2002-165784 (JP), filed on Jun. 06, 2002.
Prior Publication US 2005/0212189 A1, Sep. 29, 2005
Int. Cl. F16F 15/03 (2006.01)
U.S. Cl. 188—267 8 Claims
OG exemplary drawing
 
1. An electromagnetic shock absorber for a vehicle comprising:
a shock absorber body which is interposed between a car body and an axle, and makes telescopic motion in response to an input from outside;
a ball screw mechanism which is arranged at the shock absorber body, converts the telescopic motion into rotary motion, and is composed of a ball nut and a screw shaft;
a motor having a rotary shaft, which is provided at the shock absorber body; and
a power transmitting section having an elastic body which transmits rotary motion of the screw shaft of the ball screw mechanism to the rotary shaft of the motor and also shifts a transmission phase of the rotary motion when torque of the screw shaft is changed, said motor generating electromagnetic resistance according to shocks imparted to the vehicle, to oppose the rotary motion of the screw shaft transmitted to the motor rotary shaft,
wherein the screw shaft is coaxially connected with the rotary shaft of the motor through the power transmitting section, and
wherein the shock absorber body is composed of an external cylinder and an internal cylinder to be slidably inserted into the external cylinder, the motor is attached to the external cylinder, the ball nut of the ball screw mechanism is fixed to the internal cylinder, the screw shaft to be spirally engaged with the ball nut is rotatably supported by the external cylinder, and also the screw shaft is connected with the rotary shaft of the motor through the power transmitting section.