A filtering pulley having a hub adapted to be fixed to a rotating shaft, a pulley ring mounted coaxial and rotationally free on the hub, and a plurality of elastic assemblies arranged circumferentially with respect to the hub and the pulley ring and each interposed between a pair of first elements integral with the hub and between a pair of second elements integral with the pulley ring is disclosed. Each elastic element forms with the first elements and with the second elements respective angular clearances, and the pulley ring and the hub have a free angle of relative rotation equal to the sum of the above-mentioned angular clearances.

A coil spring assembly, including: a coil spring with a first longitudinal end and a second longitudinal end; a first end cap fixedly connected to the first longitudinal end with a first adhesive; and a second end cap fixedly connected to the second longitudinal end with a second adhesive. A method of fabricating a coil spring assembly, including: fixedly connecting, with a first adhesive, a first end cap to a first longitudinal end of a coil spring; and fixedly connecting, with a second adhesive, a second end cap to a second longitudinal end of the coil spring.

An arcuate spring having a plurality of coils which are configured and dimensioned to provide an arcuate shape to the spring and being substantially free of internal stresses which would tend to urge the coils into linear alignment. The spring is designed to function under load conditions while maintaining its natural arcuate shape. The spring is can be heated by use of an induction heating process.

A coil spring assembly, including: a coil spring with a first longitudinal end and a second longitudinal end; a first end cap fixedly connected to the first longitudinal end with a first adhesive; and a second end cap fixedly connected to the second longitudinal end with a second adhesive. A method of fabricating a coil spring assembly, including: fixedly connecting, with a first adhesive, a first end cap to a first longitudinal end of a coil spring; and fixedly connecting with a second adhesive, a second end cap to a second longitudinal end of the coil spring.

A dynamic damper device for absorbing a torsional vibration includes a rotary part, an inertia part, and an elastic part. The rotary part is a part to which the torsional vibration is transmitted, and is rotatable about a rotational center. The inertia part is provided on the rotary part so as to be movable in a radial direction with respect to the rotary part by a centrifugal force and be movable in a circumferential direction with respect to the rotary part by the torsional vibration. The elastic part couples the rotary part and the inertia part.

A damper device includes: a pressing plate; a rotation plate disposed to oppose the pressing plate; an elastic member elastically linking the pressing and rotation plates, and in which bending is generated when relative twist of the pressing and rotation plates is generated; and seats provided on both end surfaces of the elastic member The seat has a projected surface, the pressing plate has a recessed surface corresponding to the projected surface, the seats and the pressing plate come into surface-contact with each other in a case where the relative twist is not generated, one seat and the pressing plate come into surface-contact with each other, and a void is formed between the other seat and the pressing plate, in a case where the relative twist is generated, and the void increases as an angle of the relative twist increases.

A damper device is disclosed. The damper device includes first and second rotary members, a plurality of elastic members, and a plurality of end seat members. The first rotary member includes a first engaging portion and an annular chamber filled with a viscous fluid in an interior thereof. The second rotary member includes a second engaging portion, and is rotatable relative to the first rotary member. The plurality of elastic members are aligned in a circumferential direction in the interior of the annular chamber, and elastically couple the first rotary member and the second rotary member in a rotational direction. Each of the plurality of end seat members is disposed between one of the plurality of elastic members and at least one of the first and second engaging portions. The each of the plurality of end seat members includes an end seat communicating groove penetrating therethrough in the circumferential direction.

A damper apparatus includes a first rotating body, a second rotating body, and an elastic mechanism unit including an elastic body and paired seat members. The seat member includes a first surface portion coming into contact with one of the first rotating body and the second rotating body and a second surface portion coming into contact with another of the first rotating body and the second rotating body, a first angle ?1 formed by a first tangent line at a first point of contact, the first tangent line including a first vector and a second vector, and the first vector is 11.5???1?22.0?, and a second angle ?2 formed by a second tangent line at a second point of contact, the second tangent line including a third vector and a fourth vector, and the third vector is 11.5???2?22.0?.

A damper apparatus includes a drive plate, a driven plate, torsion springs, and spring housing portions. The torsion springs each have a large arc spring and a small arc spring, and elastically couple the drive plate and the driven plate in the rotation direction and transmit torque. The spring housing portions have a support surface that can support the outer periphery of the large arc springs, and the support surface comes into contact with the outer periphery of the central portions, in the lengthwise direction, of the large arc springs. Also, gaps exist between the support surface and the outer periphery of the two end portions, in the lengthwise direction, of the large arc springs.

A fluctuation attenuator has: a first flywheel 2 connected to an internal combustion engine ENG; a housing portion 7; a second flywheel 3 connected a transmission TM; a plurality of end portion sheets 10 inserted into the housing portion 7; and a coil spring 8 held on the end portion sheet 10. The end portion sheet 10 has an inserting hole 10a into which the coil spring 8 inserted, and a notched portion 10b into which a projecting piece 12a of the second flywheel 3 is inserted and with which the inserting hole 10a is communicated, and which exposes the end portion of the coil spring 8. A notched portion 10b is notched such that the projecting piece 12a contacts the end portion sheet 10 after contacting the coil spring 8 when the projecting piece 12a contacts the end portion sheet 10.