Patent Number: 6,305,675

Title: Oscillating force generator and vibration damper using the generator

Abstract: An oscillating force generator is disclosed, wherein a yoke member has an annular groove in which a coil is disposed so as to be energized by an electric current for generating magnetic circuit around the coil, and for magnetizing an inner and outer circumferential wall portions of the yoke member as respective opposite magnetic poles at their open end portions. An oscillating member made of a magnetic material is disposed opposite to the one end face of the yoke member in an axial direction of the yoke member with a predetermined axial distance therebetween. The oscillating member has an inner and an outer circumferential portion which are located nearest to the open end portions of the inner and outer circumferential wall portions of the yoke member, respectively. The coil is energized for generating magnetic force acting on the oscillating member so that an oscillating force is generated between the oscillating member and the yoke member in the axial direction thereof. At least one of the open end portions of the inner and outer circumferential wall portions of the yoke member being directly opposed in the axial direction to the inner and/or outer circumferential portions of the oscillating member, while at least the other open end portion of the inner and outer circumferential wall portions having a first circumferential edge portion which is located nearest to a second circumferential edge portion in the inner and/or outer circumferential portions of the oscillating member. The first and second edge portions being offset from each other in a direction perpendicular to the axial direction, while being opposed to each other in a direction inclined with respect to the axial direction.

Inventors: Muramatsu; Atsushi (Komaki, JP)

Assignee: Tokai Rubber Industries, Ltd.

International Classification: B06B 1/02 (20060101); B06B 1/04 (20060101); F16F 15/03 (20060101); F16F 7/10 (20060101); B60K 5/12 (20060101); F16F 015/03 ()

Expiration Date: 10/23/2018