192 clutches and power-stop control – Clutches – Automatic
Patent
1994-11-25
1997-04-29
Pitts, Andrea L.
192 clutches and power-stop control
Clutches
Automatic
192 92, 192 93A, 192104R, F16D 1304
Patent
active
056240147
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for actuating a system such as a clutch or a gearbox associated with an engine, particularly a motor vehicle engine, and of the type comprising control means and an actuation member.
There currently exist various types of mechanical gearbox with or without automatic clutch, and automatic gearboxes.
Mechanical gearboxes are also known in which both the gear change and the clutch are automatically controlled. Such automatic control involves complex and thus costly hydraulic or electrical systems which are difficult to maintain and consequently reserved in practice, until now, for competition vehicles.
The present invention aims particularly to provide a device making it possible to offer assistance to driving a motor vehicle which is simple and relatively inexpensive, and more particularly making it possible to assist the gear-change and clutch-engagement maneuvers.
Document FR-A-877,118 discloses a device for actuating a system such as a clutch or a gearbox associated with an engine, particularly a motor vehicle engine, and comprising control means and an actuation member, and furthermore including: action of the control means, shaft has rotated through a predetermined angle, and it has been uncoupled from the first shaft.
More particularly, the coupling means are made up of a friction clutch including friction members, some of which are designed to be driven by the first shaft, and others of which are capable of driving the second shaft.
The friction members are coaxial with the first shaft, the first friction members being rotationally integral with the first shaft and the second friction members being rotationally integral with a support member itself rotationally integral with a gear wheel meshing with a toothed sector rotationally integral with the second shaft.
This is therefore a mechanical device whose energy source consists of the engine itself. The power takeoff may, of course, be located in the region of the output shaft of the engine or further downstream, for example on the output shaft of the gearbox. The control member in this case is produced in the form of a pedal.
This device consequently operates like a mechanical amplifier of the force exerted by the user.
It, however, exhibits the drawback that the user must make his action last until the end of the operating cycle. If the user fails to keep a continued force on the pedal to the end of the operating cycle, this cycle is interrupted and the operation of the device and of the members which it controls is disturbed.
SUMMARY OF THE INVENTION
The present invention aims to overcome this drawback.
To this end, its subject is a device of the above-mentioned type, characterized in that it comprises means for keeping the coupling means coupled for as long as the second shaft has not made the said rotation through the predetermined angle.
Thus, the cycle finishes in all cases, even if the user interrupts his action.
More particularly, the holding means may comprise a cam and a cam follower, the rotation of the second shaft giving rise, by interaction of the cam and of the cam follower, firstly to the coupling of the second shaft to the first shaft and to their being held coupled, then, secondly, after the rotation through the predetermined angle, to their uncoupling.
In a particular embodiment, the uncoupling means comprise two uncoupling members, one of the uncoupling members including a cam such as a slot and the other uncoupling member bearing a cam follower such as a finger capable of moving in the slot, and one of the uncoupling members being integral with a casing of the device and the other uncoupling member being designed to be displaced in a first direction via a movement of the second shaft, displacement of this member in the first direction giving rise, through interaction of the cam follower and of the cam, to its displacement in a second direction which causes the second shaft to be uncoupled from the first shaft.
The rotation of the second shaft consequently po
REFERENCES:
patent: 1735201 (1929-11-01), Janda
patent: 3071021 (1963-01-01), Miller et al.
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