Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1993-09-30
1995-12-19
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
92 48, F15B 910
Patent
active
054760321
DESCRIPTION:
BRIEF SUMMARY
The present invention has as its subject a brake-booster of the partial vacuum type.
The fitting of a brake-booster is very widespread in motor vehicles. As is well known, it permits the driver to actuate the brake system by exerting a force distinctly lower than that which would be necessary in the absence of assistance.
In order to give a better understanding of the invention, a known booster of the partial vacuum type will first be described with reference to the accompanying FIG. 1.
The booster consists of a casing 10 in which is mounted a deformable diaphragm 12 which separates the casing into a back chamber 14 and a front chamber 16. The central part of the diaphragm is securely attached to a movable piston 18 whereas its periphery is securely attached to the wall of the casing. The booster is actuated by the driver with the aid of a control rod 20 connected to the brake pedal not shown. The end of the control rod 20 is connected to a plunger 22 which is slideably mounted inside the piston 18. The control rod 20 makes it possible by means, not shown in the figure, either to place in communication the back chamber 14 and front chamber 16, the two chambers thus being under a partial vacuum, or to connect the back chamber 14 to a source at atmospheric pressure in order effectively to obtain the assisted braking. The braking action is transmitted to the master cylinder, not shown in the figure, through the intermediary of a thrust rod 24 disposed in the casing 10. The thrust rod 24 in the known systems is securely attached to the piston 18 through the intermediary of a ring 26 which is applied against a disk-shaped component 28 securely attached to one end of the thrust rod and which is applied against a reaction disk 30. As is well known, a certain clearance at least in the resting position is left between the plunger 22 and the reaction disk 30. The secure attachment of the thrust rod 24 to the piston is completed by a second ring 31 the inner periphery 31a of which bears against the first ring 26 and the outer peripheral part 31b of which bears against a bearing surface 32 of the piston 18. Moreover, a return spring 34 has a first end which bears against a component 36 securely attached to the front wall of the casing and a second end which bears against the periphery 31a of the second ring 31. It will thus be seen that, because of the presence of the second ring 31, the thrust rod 24 cannot conveniently be removed from the piston.
In European Patent Application No. 0,449,703, a booster is described corresponding to that which is shown in FIG. 1, which comprises means for adjusting the kick of the booster, that is to say the space x in FIG. 1 which exists, at rest, between the back face of the reaction disk 30 and the front face of the plunger 22. Reference may be made to the abovementioned patent application in order to have further explanations on what is meant by the kick of the booster.
It suffices to understand that, in order conveniently to adjust this kick, it would be advantageous to be able to dismount the thrust rod 24 without having to dismount the rest of the booster in order to adjust the initial value of the distance x. However, it can be seen that, in the embodiment described in FIG. 1, such a dismounting is not possible.
one object of the present invention is to provide a brake-booster of the partial vacuum type in which the dismounting of the thrust rod can easily be carried out, particularly with a view to adjusting the kick of the booster without this changing the construction of the booster in a significant manner.
In order to attain this object, the brake-booster of the partial vacuum type which comprises a casing separated into two chambers by a deformable diaphragm, a piston securely attached to the central part of said diaphragm, a reaction disk, a thrust rod disposed in said casing, means for securely attaching said thrust rod and said reaction disk to said piston and resilient means applied to said piston, is characterized in that the attachment means comprise plate-forming m
REFERENCES:
patent: 4506592 (1985-03-01), Shimamura
patent: 4587884 (1986-05-01), Tsuboughi
patent: 4757748 (1988-07-01), Kawasumi et al.
patent: 4970940 (1930-11-01), Boehm et al.
patent: 5076142 (1991-12-01), Steer et al.
patent: 5176063 (1993-01-01), Levrai et al.
patent: 8572055 (1986-02-01), Schiel
Gautier Jean-Pierre
Perez-Revilla Miguel
Verbo Ulysse
AlliedSignal Europe Services Techniques
Look Edward K.
McCormick Jr. Leo H.
Nguyen Hoang
Palguta Larry J.
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