Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
1999-03-16
2001-12-04
Ryznic, John E. (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
Reexamination Certificate
active
06324844
ABSTRACT:
The present invention relates to a force transmission and amplification device, especially for a brake or clutch system, comprising a pedal and an output rod and capable of transmitting via its output rod, in response to an input force of a first intensity exerted on the pedal, an output force of a second intensity higher than the first.
BACKGROUND OF THE INVENTION
Devices of this type are well known in the prior art, and an example of them is given in Patent document FR-2,278,964.
From other sources, other brake- or clutch-system actuating devices are known, which are designed to convert the mechanical energy involved in actuating a pedal directly into hydraulic energy in the form of an increase in pressure of a hydraulic fluid. Examples of such devices are given, in particular, in Patents EP-0,293,082 and DE-3,932,529.
All the known systems do, however, have the common defect of leading to relatively high amounts of dead travel.
SUMMARY OF THE INVENTION
The invention falls within this context and its object is to provide a force transmission and amplification device for a brake system, which has a shorter dead travel.
To this end, the device of the invention, which corresponds to the generic definition in the above preamble, is essentially characterized in that it further comprises: an input rod, a first end of which is secured to the pedal; a primary piston secured to a second end of the input rod; a primary cylinder of a first diameter in which the primary piston slides in leaktight fashion therein delimiting a primary chamber of variable volume filled with a hydraulic fluid; a secondary piston to which the output rod is secured; and a secondary cylinder of a second diameter greater than the first, in which the secondary piston slides in leaktight fashion therein delimiting a second chamber of variable volume communicating with the primary chamber.
The primary cylinder and secondary cylinder are preferably secured to one another and possibly have respective axes of symmetry that form between them an angle smaller than a flat angle.
Other features and advantages of the invention will emerge clearly from the description thereof given hereafter by way of non-limiting indication, with reference to the drawings:
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Gautier Jean-Pierre
Leboisne Cedric
Comstock Warren
McCormick Jr. Leo H.
Robert & Bosch GmbH
Ryznic John E.
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