Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Patent
1995-11-13
1998-03-03
Jillions, John M.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
19221312, F16D 366, F16D 314
Patent
active
057228957
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns, in general terms, torsion predampers, notably for motor vehicles, of the type having an input part and an output part coupled to each other by two torsion damping devices with action in stages, namely a first device, called a predamper, which, weaker than the other, constitutes a preassembled unit with the output part within the second device.
It relates more particularly to the predamper.
2. Description of the Prior Art
Such a damper is described in the document FR-A-2 570 147 (U.S. Pat. No. 4,688,666).
In this document, the torsion predamper is a clutch friction disc including (FIG. 1) a support 10 of friction linings 11 and a hub 12, which can move angularly with respect to each other within the limits of a predetermined angular movement.
The support 10 constitutes the input part of the damper, its friction linings 11 being suitable for being clamped between the thrust and reaction plates of a clutch (not shown), while the hub 12 constitutes the output part thereof, the said hub being suitable for being locked with respect to rotation on the input shaft of the gearbox.
The input part 10 and the output part 12 are coupled by two torsion damping devices, with action in stages, one of which A, referred to as the first damper, is weaker than the other one B, referred to as the second device, and forms a preassembled unit with the output part 12 within the second device B.
Each of these devices has a web 13A, 13B, two guide washers 14A, 14A'-14B, 14b' fixed to each other and elastic means 15A, 15B interposed circumferentially between the web and the guide washers.
In practice, the washers 14A, 14A'-14B, 14b' are disposed axially on each side of the web 13A-13B and the elastic means consist of elastic members with circumferential action mounted in housings formed respectively facing each other in the washers 14A, 14B and in the web 13A, 13B. For the sake of convenience the web 13A will be referred to as the first web, the other web 13B as the second web and the guide washer 14B, 14B' as the main guide washers.
The elastic members, here coil springs, of the first device A, firstly, are less stiff than the elastic members 15B, also coil springs, of the second device B and, secondly, are located radially below the said members 15B so that the first device A is weaker than the second device B.
The device A is mounted axially between one of the main washers 14B, 14b" and the second web 13B of the second device B.
It forms an assembly preassembled, here by means of crimping, with the hub 12.
The second web 13A of the first device A is rotatably fixed to the hub 12 by means of fluted mounting, while its guide washers 14A,14A' are coupled to the second device B by means of driving projections 23 engaged in notches 24 in the second web 13B.
This second web 13B is mounted with an angular clearance with respect to the hub 12. To this end, the web 13B has on its inner periphery a set of flutes 20', trapezoidal in shape, engaging with clearance with a set of flutes, of complementary trapezoidal shape, which the hub 12 has on its outer periphery.
The first device A thus acts between the hub 12 and the second web 13B of the second device B, whose main guide washer 14B,14b' are fixed, in this case by rivets 21, to the support 10.
The first device A is designed to act alone when the torque to be transmitted is very low or nil within the limits of the angular clearance provided between the first web 13B and the hub 12, while the device B acts for higher torques.
For this reason, this device A with elastic members of low stiffness is called a predamper, the stiffer springs 15B of the second device fixing overall the web 13B to the washers 14B,14B' during the relative movement between the web 13B and the hub 12. Once the clearance between the web 13B and the hub 12 has been taken up, the elastic members remain taut and a relative movement occurs between the web 13B and the washers 14B with the action of friction means with an elastic washer 33
REFERENCES:
patent: 4688666 (1987-08-01), Blond
patent: 4860871 (1989-08-01), Granton et al.
patent: 4899862 (1990-02-01), Granton et al.
patent: 5000304 (1991-03-01), Kock et al.
patent: 5205389 (1993-04-01), Raab et al.
patent: 5238096 (1993-08-01), Ament et al.
patent: 5240458 (1993-08-01), Linglain et al.
patent: 5433307 (1995-07-01), Jeppe
patent: 5529161 (1996-06-01), Ament et al.
Graton Michel
Tauvron Fabrice
Dunn Eileen A.
Jillions John M.
Valeo
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