Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Element is leaf spring
Reexamination Certificate
1999-05-07
2001-01-23
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Element is leaf spring
C464S101000, C464S028000
Reexamination Certificate
active
06176785
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a torsional vibration damper or a torsionally elastic and vibration damping coupling, comprising radial spring elements inserted between an inner portion and an outer portion for torque transmission and liquid-filled chambers communicating with each other via throttle gaps for damping purposes, where at the one end the spring elements are clamped between adapters in the outer portion and at the other end engage in axial grooves of the inner portion, and the chambers are separated from each other by the spring elements on the one hand, and on the other hand by additional radial divisions between adjacent spring elements, which spare the throttle gaps.
DESCRIPTION OF THE PRIOR ART
In these dampers or couplings the spring elements, for instance spring leaves or spring assemblies, are used for torque transmission and due to their spring-elastic properties at the same time allow to influence the occurring torsional vibrations. Due to the elasticity of the spring elements there also occurs a relative rotation between inner portion and outer portion during the torque transmission, and thus a displacement of liquid between the adjacent liquid-filled chambers, which leads to a flow through the throttle gaps and thus a hydraulic damping. For forming the chambers, there have so far been used, in addition to the spring elements extending from the outer portion into the axial grooves of the inner portion, the adapters for clamping the spring elements as an additional division between the spring elements, which adapters extend radially inwards beyond the actual clamping area with web-like projections up to the outer peripheral surface of the hub of the inner portion, sparing the throttle gaps. In the vicinity of these throttle gaps disposed radially rather far to the inside free cavities are formed during rotational movements because of the liquid rushing radially outwards due to the centrifugal force, which free cavities involve the risk of increased cavitation phenomena. In addition, the inner portion itself remains dimensioned rather small in diameter due to the construction, so that for incorporating the damper or the coupling in a drive train, the connection of the inner portion requires an externally disposed increased connecting flange, in order to achieve radial screw spacings which are sufficient for the required torque transmission, which connecting flanges correspondingly increase the entire space required for the dampers or the couplings.
It is therefore the object underlying the invention to create a damper or a coupling as described above, which with a low susceptibility to cavitation is characterized by favorable possibilities for connection when it is incorporated in a drive train, and by a compact design.
SUMMARY OF THE INVENTION
This object is solved by the invention in that the divisions belong to the inner portion and each consist of a foot projection protruding between the axial grooves and an adjoining separating web extending up to the opposing adapter by sparing the terminal throttle gap, where in the foot projections there are provided holes for inserting connecting screws. By allocating the divisions to the inner portion, the throttle gaps are moved radially to the outside, so that the damping liquid displaced into the vicinity of the outer periphery due to the rotation involves a reduction of the risk of cavitation in the throttle gaps. Due to the externally disposed throttle gaps there is in addition obtained a larger useful construction space in the vicinity of the inner portion, which provides for a widening of the inner portion extending radially to the outside, which widening is on the one hand used for designing the divisions themselves, but on the other hand offers sufficient space to provide holes for inserting connecting screws in the inner portion, namely in the vicinity of the radial height of the axial grooves or also outside the axial grooves, so that the inner portion can directly be incorporated in the drive train without additional connecting flanges. The radial distance of these holes from the damper or coupling axis can be selected so large that the torques to be transmitted do not lead to an overload of the screw fastening.
An advantageous design is obtained when the adapters have a plan form substantially corresponding to a sector of a circular ring, and the separating webs of the divisions extend up to the inner arc of the adapters. Thus, the adapters are restricted to the actual clamping area of the spring elements, and the inner arc thereof provides a clear outer delimitation of the gap.
The divisions can be made integrally with the inner portion, but it is very well possible that the divisions are composed of a bulging foot projection formed at the hub of the inner portion and a separate separating web fixed at a front plate firmly mounted on the inner portion, which despite the multipart design provides sufficient room for the arrangement of the screw holes in the vicinity of the foot projection.
For reasons of manufacturing technology, the divisions can also be prepared as separate components. The divisions may for instance consist of individual separating blocks fixed at a front plate firmly mounted on the inner portion, which separating blocks are disposed one beside the other along the outer peripheral surface of the hub of the inner portion and between their foot projections form the axial grooves, or the divisions may be composed of a separate foot projection and a separate separating web fixed at a front plate firmly mounted on the inner portion, where the foot projections provided as a sleeve form the axial grooves between each other and are clamped between front plates firmly mounted on the inner portion.
REFERENCES:
patent: 1328366 (1920-01-01), Brown
patent: 3534839 (1970-10-01), Campbell et al.
patent: 4295348 (1981-10-01), Helfer et al.
patent: 4464822 (1984-08-01), Pfeifer
patent: 4470494 (1984-09-01), Takeuchi
patent: 384 085 (1987-09-01), None
patent: 0167167 (1950-11-01), None
patent: 1208953 (1966-01-01), None
patent: 2759284 (1979-08-01), None
Browne Lynne H.
Collard & Roe P.C.
Dunwoody Aaron
Ellergon Antriebstechnik GmbH
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