Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1996-05-28
1998-06-30
Luong, Vinh T.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74572, 464 24, 464 68, F16F 1510
Patent
active
057717567
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a damping flywheel and more particularly a double damping flywheel of the type comprising two coaxial masses movably mounted circumferentially in relation to one another, in opposition to resilient means.
2. Description of the Prior Art
Such a damping flywheel, especially for a motor vehicle, is described for example in document FR-A-2 565 650. One of the masses, hereinafter called "first mass", is intended to be fixed to a driving shaft whereas the other mass, hereinafter called "second mass", generally comprises a reaction plate for a friction clutch. The masses in question may be made of cast material, for example of cast iron. Depending on the complexity of the device, casting is relatively difficult to perform, especially that of the first mass.
SUMMARY OF THE INVENTION
The invention more particularly relates to an improvement of the said first mass, i.e. that which has to be fixed to the driving shaft, enabling it to be made in a simpler and more economical manner.
More precisely, the invention relates to a damping flywheel, especially for a motor vehicle, of the type comprising two coaxial masses movably mounted circumferentially in relation to one another in opposition to resilient means, in which one of the masses is intended to be fixed to a driving shaft, characterised in that this mass is essentially formed of a central portion made of sheet metal intended to be fixed to said driving shaft and of at least one massive portion, having a generally annular shape, mounted on the outer periphery of the said central portion.
This massive portion is made of sheet metal and the central portion comprises peripheral lugs inserted at the heart of the solid portion. The lugs are defined at the ends of radial arms of the central portion.
The invention will be better understood and other advantages thereof will become clearer in the light of the following description of a possible embodiment of a damping flywheel in accordance with its principle, given merely by way of example and made with reference to the attached drawings in which:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an axial half-section of a double damping flywheel in accordance with the invention, seen along the line I--I of FIG. 2; and
FIG. 2 is a half-section II--II of the damping flywheel of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
On the drawings a device is represented which forms a double damping flywheel 11 for a motor vehicle comprising two coaxial parts mounted movably in relation to one another in opposition to resilient damping means 14. This device is mounted on the shaft of the engine of a motor vehicle. The two parts form coaxial masses rotating around an axis of symmetry X--X, which is also the common axis of rotation of a driving shaft 16, here the crankshaft of the internal combustion engine, of a partially represented clutch and of a primary shaft of a gearbox, not represented.
A first rotating mass 12 is connected, here by screws 15, situated in the vicinity of its inner periphery to the driving shaft 16, whereas a second rotating mass 13 is coupled in a disengagable manner by means of the clutch pressure plate mechanism (not represented) to the primary shaft of the gearbox. The second mass 13 is rotationally mounted on a tubular hub 17 of the first mass 12 by means of a rotating bearing here formed of a ball bearing 18. The second mass 13 forms the reaction plate of the clutch mentioned above in a conventional manner.
According to a notable characteristic of the invention, the said first mass 12 essentially consists of a central portion 20, made of sheet metal, welded to the hub 17 and fixed to the driving shaft 16, and of a massive portion 22, made of cast metal, here having a generally annular shape, connected to the outer periphery of this central portion 20, here in the form flange. More precisely, the latter comprises radial arms 24 equipped with peripheral lugs 26, 27, 28 inserted at the heart 122 of the mass
REFERENCES:
patent: 2674863 (1954-04-01), Thelander
patent: 2826902 (1958-03-01), De Coursey
patent: 4148200 (1979-04-01), Schallhorn et al.
patent: 4232534 (1980-11-01), Lamarche
patent: 4351167 (1982-09-01), Hanke et al.
patent: 4674991 (1987-06-01), Tojima et al.
patent: 5384948 (1995-01-01), Bonfilio et al.
patent: 5385018 (1995-01-01), Kohno et al.
Patent Abstracts of Japan vol. 13 No. 469 (M-883), 24 Oct. 1989. JP,A,01 182651 Jul. 20, 1989.
Luong Vinh T.
Valeo
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