Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Patent
1995-09-27
1998-06-09
Dunn, Eileen A.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
192212, 464 81, F16D 352
Patent
active
057625573
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a damped flywheel, especially for a motor vehicle, of the kind comprising two coaxial masses which are mounted for movement of one with respect to the other against the action of resilient damping means, which comprise at least one resilient member operatively interposed between the said masses.
Such a damped flywheel, usually referred to as a double damped flywheel, is described for example in the documents FR-A-2 556 800, FR-A-2 571 461, FR-A-2 553 858.
2. Description of the Prior Art
As is well known, in a damped flywheel for a motor vehicle, one of the masses is carried on the crankshaft of the internal combustion engine of the vehicle, for rotation with it, while the other mass is carried, through an interposed friction clutch, on the input shaft of the gearbox, for rotation with the latter. The said flywheel is arranged to absorb the vibrations which occur in the drive train going from the engine to the road wheels.
In this system having the damped flywheel, the resonant frequency occurs below the slow running mode of the internal combustion engine, so that at starting and stopping of the engine, the system passes through the resonant frequency.
In normal running of the vehicle, resonance effects do not exist within the range of operating speeds of the heat engine. However it is necessary to provide various arrangements in order to attenuate the resonance effects at starting and stopping of the engine of the motor vehicle.
Accordingly, in the document FR-A-2 571 461, an arrangement was provided having a torque limiter, which permits unlimited rotation of one mass with respect to the other when passing through the resonant frequency.
This torque limiter has to be designed so as to transmit maximum torque from the engine, and not to allow the said maximum torque to be exceeded. As a result, it is necessary to provide a safety factor, which is such that the calibration of the limiter is not an optimum.
In the document FR-A-2 556 800, it is arranged to short circuit the resilient device of the damped flywheel and to set up a temporary parallel coupling, in which the two masses are coupled together for simultaneous rotation during starting of the vehicle.
This is achieved for example by means of a starter pinion which, at the instant when the internal combustion engine is engaged, engages at the same time in sets of teeth which are arranged correspondingly in each of the masses.
That arrangement is not entirely satisfactory, especially because it makes it necessary to modify the starter of the vehicle. In addition, a phasing problem arises between the sets of teeth of each of the masses.
In the document FR-A-2 553 848, a temporary lock of the centrifugal type is arranged to act between the two masses during starting of the vehicle.
This solution is again not entirely satisfactory, because the centrifugal lock is capable of jamming. In addition, it calls for a large number of components.
Furthermore, in the above mentioned documents, the resilient members typically consist of helical compression springs interposed circumferentially between the two masses.
These springs, under the action of centrifugal force, can come into frictional contact, for example, against a skirt which is part of one of the masses, so that abrasion effects and wear of the spring can occur. In some cases, these springs can even themselves become jammed.
It is customary to arrange for lubrication of these springs, by mounting the latter for example in a cavity, the greater part of which is bounded by one of the masses, and which is filled at least partly with grease. It is also possible to equip the springs with anti-wear elements such as pads or channel-shaped pieces.
In addition, the torsional stiffness of the device is constant, and within a given space its torque transmission capacity is limited.
It is also common to provide a hysteresis friction device between the two masses, with a friction ring which acts differentially in order to damp the
REFERENCES:
patent: 5030166 (1991-07-01), Worner et al.
patent: 5120276 (1992-06-01), Maucher et al.
patent: 5380248 (1995-01-01), Kraus et al.
patent: 5505288 (1996-04-01), Tomiyama
Japanese Patent Abstract vol. 10 No. 490 (M-779) Dec. 1988.
Chazot Frank
Feigler Jacques
Dunn Eileen A.
Valeo
LandOfFree
Damped flywheel having a resilient member disposed between two c does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Damped flywheel having a resilient member disposed between two c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Damped flywheel having a resilient member disposed between two c will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2193603