Torsion damper of reduced axial size, especially for a motor veh

Details Torsion damper of reduced axial size, especially for a motor veh Torsion damper of reduced axial size, especially for a motor veh

1995-09-18

1997-12-09

Stodola, Daniel P.

Rotary shafts, gudgeons, housings, and flexible couplings for ro

Fluid coupling

1922133, 464 67, F16D 380

Patent

active

056954034

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a torsion damper, especially for a motor vehicle, such as that described and shown for example in the document U.S. Pat. No. 4,782,933.
More particularly, the invention relates to a torsion damper, especially for a motor vehicle, comprising a first rotating element and a second rotating element, coaxial with each other, which define between them an annular housing extending radially outwardly, which receives a lubricated, circumferentially acting, resilient damping device which works between the two rotating elements, being of the type in which the greater part of the annular housing is defined by at least two components of a first one of the two rotating elements, in which the second one of the two rotating elements comprises a plate and an annular disc fixed to the plate by a set of fastening members, for example rivets, arranged circumferentially in the vicinity of the inner peripheral edge of the disc, and being also of the type comprising an annular frictional damping system arranged between the first rotating element and the disc of the second rotating element.
2. Description of the Prior Art
The document U.S. Pat. No. 4,782,933 describes and shows a design of this type, in which the complementary friction damping device is disposed radially inwardly and surrounds the hub of the first rotating element, which comprises a machined cylindrical surface for engagement with some components of the friction damping device.
In addition, the friction damping device is disposed axially between the rolling bearing which is interposed between the hub of the first rotating element and the plate-shaped element of the second rotating element, and between an annular surface portion in facing relationship to the plate of the first rotating element.
This arrangement imposes a substantial increase on the axial size of the central portion of the first rotating element, and makes it necessary to increase substantially the length of the fastening screws by which the torsion damper is fastened on to the crankshaft of the vehicle, and which extend through the hub of the first rotating element.
It is desirable to reduce the axial size of the torsion damper in the region of the central hub, in order to increase the robustness of the torsion damper and to be able to reduce the length of the fastening screws, so as to make available more space for the clutch friction wheel of the clutch which is associated with the torsion damper (the disc 9 in FIG. 1 of the document U.S. Pat. No. 4,782,933), so as to make additional space available for the accommodation of the clutch friction wheel and/or to avoid deformation of the central portion of this last-mentioned element, for the purposes of providing space in which the fastening heads of the screws by which the torsion damper is secured on the crankshaft are located.
An object of the present invention is to propose a torsion damper which enables these drawbacks to be overcome and these desirable ends to be achieved.


SUMMARY OF THE INVENTION

With this in view, the invention proposes a torsion damper of the type mentioned above, characterised in that the greater part of the annular frictional damping system is disposed radially outwardly of the zone occupied by the fastening members of the disc, and radially inwardly with respect to the sealed annular housing, and in that the frictional damping system is partly carried by a component, in the form of a plate, of the first rotating element.
By virtue of such an arrangement, it is possible to reduce substantially the axial length of the hub, because no component of the friction damping device is any longer disposed between the rolling bearing and the plate shaped element of the first rotating element.
In addition, there is no need to machine the first rotating element in the vicinity of its hub, because the damping device is not fitted at that level.
Because of this arrangement, more material can be added so that the root zone of the hub is more robus

REFERENCES:
patent: 4782933 (1988-11-01), Jackel et al.
patent: 5042632 (1991-08-01), Jackel
patent: 5301780 (1994-04-01), Jackel
patent: 5367920 (1994-11-01), Bonfilio
patent: 5377796 (1995-01-01), Friedmann et al.
patent: 5518100 (1996-05-01), Birk et al.

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