Spring devices – Vehicle – Torsion
Patent
1995-12-06
1998-02-24
Poon, Peter M.
Spring devices
Vehicle
Torsion
192201, 19221331, 464 68, F16F 512
Patent
active
057204756
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to torsion damping devices, and especially those with which motor vehicles are equipped for damping vibrations between the output shaft of the engine and the input shaft of the gearbox.
2. Description of the Prior Art
These torsion damping devices are fitted for example to the clutch, and/or to the flywheel when the latter consists of a divided flywheel which is commonly called a double damped flywheel.
In general terms, they comprise two coaxial parts, one primary, one secondary, which are mounted for rotation of one with respect to the other against the action of circumferentially acting resilient means and friction means, and which constitute masses in the case of a double damped flywheel.
The phase of operation that occurs on starting and stopping of the engine is critical, because, since the frequency of the vibrations to be absorbed is varying, either at increasing frequency in the case of starting or at decreasing frequency in the case of stopping, they inevitably pass through the natural resonance frequency of the vehicle if, as is usual, the latter lies below the minimum range that is possible during movement.
If rapid suppression of this resonant frequency is not achieved, unacceptable shocks can result.
In order to overcome this difficulty, it has been proposed in the document FR-A-2 553 848 to lock one of the two coaxial parts positively and temporarily on to the other, by means of an interposed member which acts, for example, in the manner of a bolt or wedge, and which is responsive to centrifugal force.
Such positive locking is hard to control, and this therefore leads inevitably to a substantial complication of the assembly.
In addition, the components employed run the risk of jamming.
An object of the invention is to provide a torsion damping device which does not have these drawbacks, and which also has other advantages.
SUMMARY OF THE INVENTION
This torsion damping device, which is as suitable for use with a clutch as with a double damped flywheel, is of the kind comprising two coaxial parts, one primary, one secondary, which are mounted for rotation of one with respect to the other against the action of circumferentially acting resilient means and friction means, and is in general terms characterized in that the friction means comprise at least one thin plate element which, being carried by one of the coaxial parts, extends obliquely with respect to the axis of the assembly and bears through its edge against the other one of the coaxial parts, and which is subjected, on its surface that faces away from the axis of the assembly, to the action of a modulating member which is responsive to centrifugal force.
The locking action adapted to take place on starting and stopping is thus advantageously obtained not in a positive manner, but by friction.
Consequently there is no risk of any component whatsoever becoming jammed.
The assembly has the additional advantage that its construction is particularly simple.
For example, the modulating member responsive to centrifugal force can very simply be a spring, which may optionally be loaded with at least one weight, and which extends in an annular manner around the axis of the assembly, being elastically deformable in the radial direction.
Preferably, the thin plate element which is employed extends, itself, in a continuous circle around the axis of the assembly, in the manner of a ring.
Thus, in the case where one of the two coaxial parts defines a chamber in which the resilient means are disposed, while the other one includes a damper plate which extends radially into the said chamber for engagement with the said resilient means, the said thin plate element has the advantage that it can be employed beneficially to close off the interior of the said chamber sealingly at the level of the plate element.
In this way, additional use is advantageously made of the said thin plate element.
In that case there is such a thin plate element on at least one side of the damper plate
REFERENCES:
patent: 4767380 (1988-08-01), Chasseguet et al.
patent: 5245889 (1993-09-01), Kohno et al.
patent: 5293978 (1994-03-01), Reik et al.
Patent Abstracts of Japan vol. 10, No. 146 (M-482) (2203) May 28, 1986.
Patent Abstracts of Japan vol. 17, No. (M-1385) Mar. 22, 1993.
Poon Peter M.
Valeo
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