192 clutches and power-stop control – Elements – Clutch element resiliently carried on hub
Reexamination Certificate
2000-10-13
2002-09-10
Rodriquez, Saul (Department: 3681)
192 clutches and power-stop control
Elements
Clutch element resiliently carried on hub
C192S070170, C464S068800
Reexamination Certificate
active
06446780
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a torsional vibration damper for arrangement in a clutch disk including a hub element, a hub-disk arrangement carried on the hub element, the hub-disk arrangement including a first transmission arrangement and a second transmission arrangement rotatable about an axis of rotation relative to the first transmission arrangement, a first damping arrangement acting between the first and the second transmission arrangement, a third transmission arrangement connected in a rotationally fixed manner to the hub element, a second damping arrangement which acts between the third transmission arrangement and one of the first and second transmission arrangements and allows a relative rotation between the third transmission arrangement and the one of the first and second transmission arrangements, and a first friction device acting between the third transmission arrangement and at least one transmission arrangement of the first and second transmission arrangements.
2. Description of the Related Art
Reference DE 33 13 850 A1 discloses a clutch disk which contains a torsional vibration damper constructed with a hub element, a hub-disk arrangement carried on the hub element, the hub-disk arrangement including a first transmission arrangement and a second transmission arrangement rotatable about an axis of rotation relative to the first transmission arrangement, a first damping arrangement acting between the first and the second transmission arrangement, a third transmission arrangement connected in a rotationally fixed manner to the hub element, a second damping arrangement which acts between the third transmission arrangement and one of the first and second transmission arrangements and allows a relative rotation between the third transmission arrangement and the one of the first and second transmission arrangements, and a first friction device acting between the third transmission arrangement and at least one transmission arrangement of the first and second transmission arrangements.
In this reference, the third transmission arrangement is formed by a disk-type area which is formed integrally with a hub element and projects radially outward. The second transmission arrangement is formed by a hub-disk element having two sheet-metal elements. A radially inner area of the second transmission arrangement surrounds both axial sides of the first transmission arrangement. A damping-spring arrangement acts between the second transmission arrangement formed by the two sheet-metal parts and the third transmission arrangement formed by the disk-type area for allowing relative rotation of these two transmission arrangements with respect to one another in the idling range.
The second transmission arrangement is mounted radially on the hub element and one of the sheet-metal parts of the second transmission arrangement is supported axially against one axial side of the third transmission arrangement via a friction ring. A preloading spring is supported against the other one of the sheet-metal parts of the second transmission arrangement via an intermediate ring and on the other axial side of the third transmission arrangement. The friction ring, the intermediate ring and the preloading spring provide a friction device which acts between the second and third transmission arrangements. In the idling range, the friction ring converts vibrational energy into friction work and thus contributes to the damping of torsional vibrations.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a torsional vibration damper with improved capability for tuning to vibration characteristics that occur in particular drive systems, especially in the idling or predamping range.
According to the present invention, the object is achieved by a torsional vibration damper for arrangement in a clutch disk, comprising a hub element and a hub-disk arrangement carried on the hub element. The hub disk arrangement comprises a first transmission arrangement and a second transmission arrangement which is rotatable about an axis of rotation relative to the first transmission arrangement. A first damping arrangement such as, for example, a damping-spring arrangement acts between the first and the second transmission arrangement. A third transmission arrangement is arranged on the hub element in a rotationally fixed manner or may alternatively comprise an integral part with the hub element. A second damping arrangement such as, for example, a damping-spring arrangement acts between the third transmission arrangement and one of the first and second transmission arrangements. The second damping arrangement allows a relative rotation between the third transmission arrangement and the one of the first and second transmission arrangements. A first friction device acts between the third transmission arrangement and at least one transmission arrangement of the first and second transmission arrangements.
In the torsional vibration damper according to the present invention, the first friction device includes a first friction-device area which generates essentially no frictional force in an angular range of relative rotation between the third transmission arrangement and the at least one transmission arrangement of the first and second transmission arrangements and generates a frictional force when the angular range of relative rotation is exceeded. The angular range starts from a basic relative rotational position between the third transmission arrangement and the at least one transmission arrangement of the first and second transmission arrangements.
This arrangement allows the friction device to act parallel to the second damping arrangement. A characteristic of the friction device is that a significant rise in the frictional force is generated from a particular angle of relative rotation onward—that is to say there is a delayed friction characteristic—for obtaining improved tunability to particular vibrations or particular drive systems. In addition to the strength of the frictional force generated, the magnitude of the adjustable angular ranges of relative rotation represents a further parameter that may be varied for the purpose of tuning to particular systems.
In a preferred embodiment of the present invention, the first friction-device area of the first friction device is effective only between the third transmission arrangement and that transmission arrangement of the first and second transmission arrangements which interacts with the second damper arrangement.
The ability to tune to the particular requirements of a specific application of the torsional vibration damper may be improved further if the first friction device further comprises a second friction-device area which generates a frictional force essentially independently of the relative rotational position of the third transmission arrangement and the at least one transmission arrangement of the first and second transmission arrangements. In this embodiment, a basic friction is already being generated within the angular range of relative rotation. The basic friction is then increased further by the first friction-device area when the angular range of relative rotation is exceeded.
The torsional vibration damper according to the present invention for the first friction-device area comprises a friction-element arrangement which rests under preload against the third transmission arrangement and/or the at least one transmission arrangement of the first and second transmission arrangements. The friction-element arrangement may comprise at least one friction element which rubs against the third transmission arrangement and/or the at least one transmission arrangement of the first and second transmission arrangements. This friction element may rub against the at least one transmission arrangement of the first and second transmission arrangements and may be coupled or connectable in a rotationally fixed manner to the third transmission arrangement.
The delayed-action friction character
Cohen & Pontani, Lieberman & Pavane
Mannesmann Sachs AG
Rodriquez Saul
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