Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1996-02-20
1998-09-22
Bonck, Rodney H.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
741001, 192 846, 192 90, 192 91R, F16D 2800, F16D 2900
Patent
active
058098305
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to control devices of the kind comprising an electric motor which acts through a transmission on an output element, resilient assisting means which act in parallel with the electric motor on one of the members that constitute the transmission, and mechanical compensating means which provide controlled modulation of the action of the resilient assisting means on the said member of the transmission. These control devices are applicable especially for the control of the clutch of a motor vehicle, as is described for example in the documents FR-A-2 523 743, 2 564 920 and 2 541 793 (U.S. Pat. Nos. 4,878,396, 4,671,400).
2. Description of the Prior Art
During an operation of controlling the disengagement of such a clutch, the electric motor, through the interposed transmission and output element, ensures the suitable positioning of the clutch release bearing, with the output element working accordingly, for example, on the declutching force conventionally associated with the latter, while under the control of the mechanical compensating means, the resilient assisting means develop the axial force necessary for balancing the reaction force which is due to the diaphragm of the clutch.
Thanks to the said resilient assisting means, it is possible, with advantage, to fulfil the requirements of the system with a relatively low power electric motor.
At the same time, the mechanical compensating means have the advantage of enabling the said resilient assisting means to be matched to the inherent characteristics of the diaphragm.
The invention is directed more particularly to the case where the output element is a hydraulic actuator, which has the advantage of enabling the forces due to the inevitable wear in the friction liners of the friction disc of the clutch, and the forces on the piston on which the electric motor works through the transmission, as is the case for example in the documents FR-A-2 611 615 and 2 614 661, to be absorbed more easily.
In those documents, the transmission comprises two members, namely a worm which is mounted in rotation on the output shaft of the electric motor, and a toothed wheel, which engages tangentially with the worm and to which a thrust member, acting on the piston of the hydraulic actuator, is articulated in the manner of a crank, while at the same time the mechanical compensating means result from the fact that the resilient assisting means act at one point on the said toothed wheel, which is offset angularly from the point at which the said thrust member is articulated to it.
Having regard to the fact that the said transmission must also afford a certain reduction ratio, the toothed wheel inevitably has a relatively large diameter, to the detriment of the overall size of the assembly and such as to make it difficult to fit within a crowded environment.
An object of the invention is to provide a control device of the kind concerned which can advantageously be made in a reduced size, and which also has other advantages.
SUMMARY OF THE INVENTION
This control device is characterised in that, its output element being defined by a hydraulic actuator, on the piston of which the electric motor acts through an interposed transmission, the mechanical compensating means include at least one train of rollers, which are mounted for rotation about a fixed axis orthogonal to the axis of the hydraulic actuator and which comprise, spaced away from the said fixed axis, at least two rollers, namely a first roller making contact with a first plate, which is coupled to the said member of the transmission for movement therewith and which is movable axially between two positions, one retracted and one deployed, and a second roller making contact with a second plate, on which the resilient assisting means bear, and which, while being rotatable with the first plate, is mounted for axial movement with respect to the latter.
The control device constructed in this way can be advantageously made in a relatively reduc
REFERENCES:
patent: 4202430 (1980-05-01), Stevens
patent: 4591034 (1986-05-01), Tellert et al.
patent: 4671400 (1987-06-01), Grunberg et al.
patent: 4729544 (1988-03-01), Baumann
patent: 4828093 (1989-05-01), Bertin et al.
patent: 4852419 (1989-08-01), Kittel et al.
patent: 4878396 (1989-11-01), Grunberg
patent: 5094079 (1992-03-01), Leigh-Monstevens et al.
Bonck Rodney H.
Valeo
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