Abstract: A lock-up device for a fluid coupling suppresses vibration caused by coil springs. The lock-up device includes an input rotation member, an output rotation member, a plurality of first elastic members, and a float member. The plurality of first elastic members are compressed in a rotational direction by the relative rotation of the input rotation member and the output rotation member. The float member is rotatable relative to the input rotation member to cause two of the first elastic members to act in series in a circumferential direction.

Abstract: A rotational vibration damper includes a primary side (32) and a secondary side (46) which is rotatable with respect to the primary side (32) around an axis of rotation (A) against the action of a damper element arrangement (28). At least one damper element unit (42) of the first group (70) and at least one damper element unit (42?) of the second group (70?) are pre-loaded, and the primary side (32) and the secondary side (46) are pre-loaded in a basic relative rotation position with respect to one another. Proceeding from the basic relative rotation position of the primary side (32) with respect to the secondary side (46), a pre-loading path (V, V?) of at least one pre-loaded damper element unit (42) is shorter than a maximum relative rotation path of the primary side (32) with respect to the secondary side (46).

Abstract: A damper assembly for a torque converter is provided. The damper assembly includes a first cover plate; a second cover plate, the first cover plate and second cover plate supporting springs therebetween; a first flange between the first cover plate and the second cover plate; and a second flange between the first cover plate and the second plate, the first flange and second flange being arranged with respect to the first and second cover plates and the springs such that the springs transition during operation of the damper assembly from initially operating in series to operating in parallel.

Abstract: A damper device including an input element to which power from a motor is transmitted; a first elastic body to which power is transmitted from the input element; a first intermediate element to which power is transmitted from the first elastic body; a second elastic body to which power is transmitted from the first intermediate element; a second intermediate element to which power is transmitted from the second elastic body; a third elastic body to which power is transmitted from the second intermediate element; and an output element to which power is transmitted from the third elastic body. The first and second elastic bodies are coil springs, and the third elastic body is an arc spring that is arranged radially inward of the first and second elastic bodies.

Abstract: A damper device including an input element to which power from a motor is transmitted; a first elastic body to which power is transmitted from the input element; a first intermediate element to which power is transmitted from the first elastic body; a second elastic body to which power is transmitted from the first intermediate element; a second intermediate element to which power is transmitted from the second elastic body; a third elastic body to which power is transmitted from the second intermediate element; and an output element to which power is transmitted from the third elastic body. A stiffness of the first elastic body is higher than a stiffness of the second elastic body.

Abstract: In a damper apparatus, power is transferred, in order, from a motor, to an input, to a first elastic body, to a first element, to a second elastic body, to a second element, to a third elastic body, and to an output. The first and second elastic bodies are disposed radially outward of the third elastic body, and adjacent to each other on a single circumference. The first element has an annular outer peripheral portion that surrounds the first and second elastic bodies, and a pair of contact portions that are formed on peripheral edges on respective sides of the outer peripheral portion to protrude from the peripheral edges radially inward and to face each other, and that are between and in contact with the first elastic body and the second elastic body.

Abstract: A damper device including an input element to which power from a motor is transmitted; a first elastic body to which the power is transmitted from the input element; a first intermediate element to which the power is transmitted from the first elastic body; a second elastic body to which the power is transmitted from the first intermediate element; a second intermediate element to which the power is transmitted from the second elastic body, a third elastic body to which the power is transmitted from the second intermediate element; and an output element to which the power is transmitted from the third elastic body. The second elastic body is lighter than the first elastic body.

Abstract: Improved performance of arc coil springs by stress reduction when they are bottomed out is achieved by forming the coil spring wire in a substantially trapezoidal or other shape such that when bottomed, the side surfaces of the coil abut and carry the bottoming load which is distributed over a comparatively large surface area. The angles of the sidewalls of the substantially trapezoidal cross section wire are preferably coincident with lines of radius when the spring is installed in an arc in a clutch, damper or flywheel. The radius of the outer surface of the arc coil spring wire is matched to the radius of the inner surface of the guide or housing so that the area of contact is large, thereby distributing the outwardly directed spring force over a large area, reducing the force per unit area and improving lubrication retention on the contacting surfaces.

Abstract: A damper device including an input element to which power from a motor is transmitted; a first elastic body to which power is transmitted from the input element; a first intermediate element to which power is transmitted from the first elastic body; a second elastic body to which power is transmitted from the first intermediate element; a second intermediate element to which power is transmitted from the second elastic body; a third elastic body to which power is transmitted from the second intermediate element; and an output element to which power is transmitted from the third elastic body. A stiffness of the third elastic body is higher than a stiffness of the second elastic body.

Abstract: A torque transmission device for a motor vehicle, having a torque input element (7), a torque output element (24), and at least two elastic members (10a, 10b) mounted between the torque input and output elements (7, 24) and counteracting rotation of input and output elements with respect to one another. The elastic members (10a, 10b) are arranged serially by means of a phasing member (30) so that the elastic members (10a, 10b) deform in phase with one another. The stiffness K1 of the elastic member (10a) mounted between the torque input element (7) and the phasing member (30) is less than the stiffness K2 of the elastic member (10b) mounted between the phasing member (30) and the torque output element (34), the ratio K2/K1 being equal to at least 2.

Abstract: A damper device includes a first rotation member coupled to an engine; a second rotation member coupled to a drive member driven by power generated from the engine and capable of rotating relative to the first rotation member; and a coil spring configured to transmit the power between the first rotation member and the second rotation member, and absorb a torque variation between the first rotation member and the second rotation member, wherein the coil spring has a hollow portion that is an internal area and an outline portion that is an outer area on a cross-sectional shape on a plane including a centerline of the coil spring, the hollow portion having lower rigidity and lower density than those of the outline portion. Accordingly, the damper device can reduce the influence caused by the centrifugal force.

Abstract: The damper (12) includes first (14) and second (16) damping elements which are arranged in parallel by means of a connection disc (20). The first damping elements (14) comprise at least one first group (24) of resilient units (22) including at least two first resilient units (22) arranged in series by means of a first intermediate support element (26), and the second damping element (16) comprise at least one second group (34) of resilient units (32) comprising at least two second resilient units (32) arranged in series by means of a second intermediate support element (36). The damper includes at least one annular unit (39) for phasing of the resilient units (22, 32), which is distinct from the connection disc (20) and bears both the first (26) and second (36) intermediate support elements.

Abstract: A torque fluctuation absorber includes a first rotary member formed into an annular shape and including a first protruding portion formed at an inner circumferential surface, a second rotary member connected to the first rotary member, a third rotary member including a second protruding portion formed at an outer circumferential surface, a damper portion absorbing torque fluctuations caused by torsion generated between the second rotary member and the third rotary member, and an elastic member arranged between the first protruding portion and the second protruding portion and absorbing a shock generated when the first protruding portion directly makes contact with the second protruding portion when the damper portion absorbs the torque fluctuations caused by the torsion generated between the second rotary member and the third rotary member.

Abstract: A torsional vibration damper with a friction device. The friction device is formed on at least one friction surface on two contra-rotationally and oppositely disposed disc parts that are in frictional contact with one another. In order to propose how to determine the initial stressing effect of the frictional action independently of external support of the disc parts, the frictional surfaces are pressurized against one another by means of at least one spring element.

Abstract: A torsional vibration damper, comprising at least two components which can be rotated counter to the resistance of at least one helical spring or bow spring precurved toward the rotational axis for compression of the at least one bow spring during a relative rotation among the components. The at least one bow spring is provided with support in the circumferential direction across the outside diameter thereof on a sliding shell. In order to reduce friction, the outside diameter of the at least one bow spring has a distance from the inside diameter of the sliding shell.

Abstract: A dual-mass flywheel for a drive train of a motor vehicle having a primary flywheel mass and a secondary flywheel mass which are coupled to one another in a rotationally elastic manner via at least one spring device. At least one gear device is disposed between the spring device and at least one of the two flywheel masses. The gear device causing a deflection movement of the spring device relative to a rotational movement of the two flywheel masses in relation to one another, wherein a characteristic curve of the spring device may be modified by the gear device.

Abstract: In a flywheel in which narrow portions to be engaged with a coil spring included in the flywheel are formed of recessed portions made by recessing the surface of a flywheel cover, the portions of a sensor plate welded to the front cover, which confront with the recessed portions are made more fragile than adjacent portions of the sensor plate. With this configuration, when the front cover is deformed, stress applied to welded portions adjacent to the recessed portions can be suppressed since the fragile portions are easily deformed. Accordingly, even if the recessed portions are formed to the surface of a flywheel cover, stress can be prevented from being concentrated on the coupling portions of the flywheel cover and the sensor plate.

Abstract: A torsional vibration damper includes a plurality of coil springs which are each received in a pair of windows of respective takeoff side and drive side transmission elements. Each spring has a pair of opposed final turns separated by a plurality of intermediate turns, wherein each final turn is against a circumferential boundary of a respective window. Each final turn has a tip area which is in contact with an adjacent intermediate turn, the final turn being separated from the adjacent intermediate turn by a first distance which increases from the tip area to a maximum value within a predetermined angle ? following the tip area. This maximum value, in a load-free state of the springs, is essentially the same as a second distance separating adjacent intermediate turns.

Abstract: A torsional vibration damper, particularly for use in the power train of a motor vehicle, employs one or more preferably arcuate coil springs having constant inner radii and one or more sets of neighboring smaller-diameter convolutions next to one or more sets of neighboring larger-diameter convolutions. The coil spring or springs is or are compressible by the retainers of two components which can turn, about a common axis, with and relative to each other and at least one of which defines a chamber for the coil spring(s). The retainers of the components can act upon the adjacent end convolutions of the coil spring or of two or more series-arranged coil springs between them by way of plastic slide elements and/or elastic bumpers.

Abstract: A torsional vibration damper includes a primary mass defining a ring-shaped chamber, a secondary mass relatively rotatably connected to the primary mass, and a damping unit for coupling the primary and secondary masses to each other in a rotationally elastic manner. The damping unit comprises a plurality of coil springs, a pair of end guides, and a friction member slidably disposed between neighboring coil springs. The friction member is configured to be rubbed against at least one of an inner wall and an outer wall of the ring-shaped chamber in response to compressions of the coil springs such that a friction force is generated in proportion to a relative rotation between the primary and secondary masses as well as to a rotational speed thereof.

Abstract: A torsional vibration insulator for a drive train of a vehicle, in which a primary element and a secondary element can rotate relative to one another. At least two spring elements extend in an arc in a circumferential direction of the rotational axis and are each supported on a radial outer face by a radial support device. The length of the two spring elements, viewed in the circumferential direction, can be modified by rotating the primary element with respect to the secondary element. The radial support devices of the spring elements have multiple support elements which engage with the radial outer face of the spring elements and which are rotatably mounted in the circumferential direction in such a way that the support elements can be carried along with the spring elements in the circumferential direction when the length of the spring elements is modified, thereby eliminating frictional forces inhibiting rotational motion between the primary element and the secondary element.

Abstract: A torsional vibration damping device (1), in particular for a motor vehicle clutch, said device comprising a disc (60) and a support (80) mounted mobile in rotation relative to each other about a common main axis, and linked in rotation via circumferential elastic members (90) damping torsional vibrations, said elastic members being interposed between the disc (60) and the support (80) and maintained in position circumferentially via lugs (65) of the disc (60) and lugs (82,84) of the support (80) whereon are supported the elastic members (90) and radially via a guide ring (100) passing through the elastic members (90) and integral with the disc (60). Said device is characterised in that the lugs (82,84) of the support (80) are mounted on either side of a section of the ring (100) and the lugs (65) of the disc (60) can move freely at the angle between the lugs (82,84) of the support (80).

Abstract: A torsional vibration damper with at least two components that are rotatable relative to each other against the opposition of at least two deformable energy storing elements, such as arcuate coil springs. In order to at least reduce the noise that is generated by the damper, the energy storing elements are connected to each other by at least one coupling device that is designed to ensure that, when one of the energy storing elements is deformed, there results a controlled entrainment of the other energy storing element or elements.