Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Reexamination Certificate
1999-11-17
2002-06-11
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
C192S214100
Reexamination Certificate
active
06402622
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a torsional vibration damper for taking up and/or compensating for rotary shocks, especially torque fluctuations of an internal combustion engine, with at last two disc parts which are rotatable relative to each other against the action of at least one energy accumulator which is provided between the disc parts in the force transmitting path and acts at least in the circumferential direction.
Torsional vibration dampers of such kind are known and in accordance with one embodiment, can constitute divided flywheels with flywheel masses. Torsional vibration dampers of such kind normally comprise circumferentially spaced apart energy accumulators which are biased on the circumferential side through recesses or shaped areas in the two flywheel masses. By way of example, reference is made to FR PS 2 166 604. Such torsional vibration dampers are subject to pronounced wear upon the biasing devices and energy accumulators as a result of their design. Solutions have therefore been proposed such as, for example, in DE PS 35 15 928 using lubricant-filled energy accumulator chambers which are sealed on the outside but these are correspondingly expensive to construct and therefore involve increased manufacturing costs.
OBJECT OF THE INVENTION
Accordingly, it is an object of the invention to provide a torsional vibration damper of the kind described which is less susceptible to wear and thus exhibits a greater durability whilst at the same time optimizes production costs. Furthermore, a simple mounting of the energy accumulators in the flywheel masses is also to be made possible. The energy accumulators should be supported as uniformly as possible at their ends in the circumferential direction and secured against escape radially outwards in the event of high centrifugal forces.
SUMMARY OF THE INVENTION
This is achieved according to the invention by the provision of a torsional vibration damper which comprises between at least two relatively rotatable disc parts at least one energy accumulator in the force transmitting path, which is active at least in the circumferential direction, and which is housed in a suspension device divided into two socket parts, the two socket parts being adapted to be biased in dependence on the circumferential direction by biasing means of the two disc parts to compress at least one energy accumulator and the biasing devices each bias one socket part alternately in dependence on the direction of rotation.
Torsional vibration dampers of such kind can be equipped for example with simple disc parts and can be used as friction lining supports in a clutch, for example, in the power train between the drive unit and the gearbox. Furthermore, the disc parts can be provided with flywheel masses or can consist of flywheel mass elements whereby they can be used in the power train as a divided flywheel with two flywheel masses which can be rotated relative to each other against the action of the at least one energy accumulator.
The biasing means can advantageously be shaped as a bolt or stud fixed axially on the disc parts, and the disc parts can constitute circular discs and can be provided with flywheel masses and one disc part can be connected to the drive shaft of an internal combustion engine and the second disc part can be connected to the input shaft of a gearbox through a friction clutch or the like fixed on the second disc part.
The suspension or receiving device, which can also be used in conventional damping devices without flywheel masses, consists for suspension of the at least one energy accumulator, wherein four to eight, and preferably six, helical compression springs spread out over the circumference can be particularly advantageous, of two socket parts which for reasons of cost efficiency and easier mounting can be identical and face one another mirror symmetrically and can be fitted in each other turned by the angle of one energy accumulator socket whereby in the event of predetermined stressing they can transmit a basic friction torque in the torsion vibration damper at the points where they contact each other. Furthermore, stops or sockets for the energy accumulator corresponding to the relevant number of energy accumulators can be provided on each socket part and extend over the entire axial width of the suspension device and therefore engage in the relevant other socket part so that for each energy accumulator one stop or one biasing device can be formed at one circumferential end by the first socket part and thus by the first disc part and at the other end by the second socket part and thus by the second disc part. The large surface socket can advantageously be 70% and more of the area of the energy accumulator cross-sections and, therefore, the ends of the energy accumulators need not be ground as exactly flat as in conventional dampers or indeed grinding can be omitted completely. The inclination of a socket in the circumferential direction is preferably selected in such a way that it conforms to the inclination of the ends of the energy accumulators and thus the contact faces of the energy accumulator ends can be further optimized.
According to the invention, the two preferably identical socket parts are formed in such a way that they each have a ring-shaped carrier mounted at the outer circumference and a ring shaped support mounted on the inner circumference which both lie in one plane and have approximately half the axial width of the suspension device whereby on one axial side the sockets provided radially between the support rings protrude for the energy accumulators which when the two socket parts are assembled engage in each other. The outer support can have approximately the cross-sectional shape of a quarter circle or can be chamfered so that the suspension device overall can have approximately a semi circular profiled section or a profiled section on the outer circumference which is chamfered at the outer edges.
It can further be advantageous to limit the extent of angular movement of the two socket parts, that is the angular movement of the socket parts relative to the biasing means of the disc parts. To this end, in addition to the blocking of the energy accumulators—when using coil compression springs through the windings stopping against each other—stops can be provided on the sockets for the energy accumulators inside the outer support and these project circumferentially into the pockets in which the energy accumulators are housed whereby of each socket of the energy accumulator one stop projects into the pocket so that by selecting the length of the two stops projecting into the pockets it is possible to fix the turning angle in the circumferential direction. A turning angle is preferably selected which is smaller than that provided by the blocking of the energy accumulators.
The stops which are provided to limit the extent of angular movement advantageously serve at the same time as radial supports for the energy accumulators radially outwards, especially in the case of high centrifugal force action, and to this end can have the cross-section of a ring segment. A profiled section matching the cross-section of the energy accumulators can be formed as a support for the energy accumulators on the inside in the area of the pockets for holding the energy accumulators on the inner support whereby the overall profiled section is produced by fitting together the two supports of the socket parts. The inner circumference of the two inner supports can be designed flat so that the hanging device where required can be centered and/or mounted thereon.
When using coil compression springs as energy accumulators these can be wound according to the invention so that they have windings with different diameters. Coil compression springs can advantageously be used which starting and ending with a winding of larger diameter have alternately large and small windings. Furthermore it can be provided that the center point axis of the windings with large and small diameter is not the same—thus a concentric
Jäckel Johann
Kooy Ad
Binda Greg
Browne Lynne H.
Darby & Darby
LuK Lamellen und Kupplungsbau GmbH
LandOfFree
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