Machine element or mechanism – Control lever and linkage systems – Hand operated
Patent
1993-09-30
1995-10-03
Luong, Vinh T.
Machine element or mechanism
Control lever and linkage systems
Hand operated
3031134, 3031143, 3031133, 188356, F16C 110, B60T 834
Patent
active
054542790
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention has as its subject a brake-booster device of partial vacuum type for a vehicle fitted with direct braking control means comprising: an enclosed space; a deformable diaphragm separating said space into a first chamber and into a second chamber connected to a first pressure source delivering a first pressure; a member forming a piston securely attached to the central part of said diaphragm and bearing a reaction disk; a movable member for control of braking by the foot; means for placing in communication carried by the member forming a piston and capable of selectively placing the first chamber in communication with the first pressure source or with a second pressure source delivering a second pressure higher than said first pressure, according to the position of said member for control of braking by the foot; means for detection of parameters for which a direct braking has to be operated; means forming a partition which are securely attached to said member forming a piston so as to define with the latter a third chamber, said means forming a partition isolating said second chamber from the means for placing in communication; and means for selectively connecting said third chamber to the first or to the second pressure source in response to a signal delivered by said detection means.
DESCRIPTION OF THE PRIOR ART
The use of a booster interposed between the brake pedal of a vehicle and the master cylinder directly controlling the actuation of the brakes is well known and has the object of reducing very substantially the force which the motorist has to apply on the pedal in order to obtain the braking. Moreover, it is desired in some circumstances to provide the brake system with means which make it possible to control the action of the brakes even if the motorist is not pressing on the brake pedal. This is for example the case when a vehicle is moving on a downward slope of steep gradient or possibly in other circumstances. These systems comprise one or more detectors of running or attitude parameters of the vehicle which directly control the action of the brakes. These systems are known by the English term "Hill Holder" or "Traction Control". In the present text, the expression "direct control means" covers these different systems.
Systems of this type are for example described in documents EP-A-0,347,583, EP-A-0,171,585 and EP-A-0,303,470.
Whatever their effectiveness, the solutions illustrated in these documents have the drawback of requiring significant alteration of the piston, and in particular the piston body, with respect to the conventional configuration as represented in FIG. 1, or an entirely specific piston, in order to allow direct application of atmospheric pressure into the back chamber under the effect of direct control.
Such a requirement makes it difficult to fit this system on mass-produced vehicles, in particular if it involves a large number of specific parts for producing the booster, which parts additionally necessitate a special type approval.
SUMMARY OF THE INVENTION
In this context, one object of the present invention is to provide a brake-booster device which comprises direct braking control means, in which the various parts of the conventional booster can be retained.
In order to achieve this object, according to the invention, the partial vacuum type brake-booster device as defined in the preamble is essentially characterized in that said member forming a piston comprises a skirt and a central part comprising said means for placing in communication, and in that said means forming a partition comprise a part, the periphery of which is securely attached in a leak-tight manner to said skirt, said third chamber being formed between said part on the one hand and said skirt and said central part on the other hand.
It is therefore clear that, by virtue of the invention, a brake-booster structure of conventional type is started with, to which is added a partition securely attached to the piston of the deformable diaphragm in order to prod
REFERENCES:
patent: 4610483 (1986-09-01), Matsumoto et al.
patent: 4819996 (1989-04-01), Belart et al.
patent: 5072996 (1991-12-01), Heibel et al.
patent: 5098170 (1992-03-01), Watanabe
patent: 5141295 (1992-08-01), Burgdorf et al.
patent: 5181769 (1993-01-01), Schiel et al.
patent: 5312173 (1994-05-01), Rossigno
patent: 5338107 (1994-08-01), Rossigno et al.
patent: 5350225 (1994-09-01), Steiner et al.
Castel Philippe
Pressaco Pierre
AlliedSignal Europe Services Techniques
Luong Vinh T.
McCormick Jr. Leo H.
Palguta Larry J.
LandOfFree
Brake-booster device partial vacuum type for a vehicle fitted wi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Brake-booster device partial vacuum type for a vehicle fitted wi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Brake-booster device partial vacuum type for a vehicle fitted wi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1071776