Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1993-05-04
1994-10-18
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
92 98D, F15B 910, B60T 13567
Patent
active
053557700
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to pneumatic boosters, more particularly of the type of those which are used in order to provide assistance to the braking of motor vehicles.
Boosters of this type comprise in a conventional manner a casing within which is found at least one piston structure which, with the help of an unrolling membrane, defines at least one front chamber permanently connected to a partial vacuum source and at least one back chamber connected selectively to the front chamber or to the atmosphere via a valve means when a control rod is actuated, and a device for fastening the booster on a wall adjacent to a first face of the casing.
The booster is mounted, as a general rule, on the apron of the engine compartment of the vehicle by mounting screws which are fastened on the back part of the casing on the apron side. It is therefore necessary to tighten nuts onto the mounting screws on the vehicle passenger compartment side. This operation presents disadvantages for the manufacturers during the production of the vehicle, because it requires the execution of operations simultaneously on the engine compartment side and on the passenger compartment side.
The object of the present invention is therefore to provide a brake-booster which permits mounting thereof in a vehicle by working solely on the side of the wall where the booster is mounted.
According to the invention, this result is obtained by making apertures in the piston structure and in a second face of the casing, these apertures being aligned in the axial direction of the booster so as to permit the actuation of the fastening device through the aperture made in the second face of the casing, the aperture made in the piston structure receiving a closing member.
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a view in longitudinal section of a brake-booster, constructed in conventional manner in the upper half of this Figure and constructed according to a first embodiment of the invention in the lower half of this Figure.
FIG. 2 is a view similar to that of FIG. 1 and shows in its lower half a second embodiment of the invention.
FIG. 3 gives a partial view of a variant of FIG. 2.
FIG. 4 is a view in longitudinal section of a brake-booster mounted in tandem, produced in accordance with one embodiment of the invention, and
FIG. 5 is a view in longitudinal section of a brake-booster with an additional chamber, produced in accordance with one embodiment of the invention.
FIG. 1 shows a brake-booster intended to be placed, in a usual manner, between the brake pedal of a vehicle and the master cylinder controlling the hydraulic brake system. By convention, the part of the booster directed towards the master cylinder will be termed "front" and the part of the booster directed towards the brake pedal, "back".
The booster comprises a shell-shaped outer casing 10 presenting substantially a symmetry of revolution about an axis X-X'. A flexible membrane in elastomer 12, reinforced in its central part by a metal disk 14 also termed skirt, defines within the space delimited by the casing 10 a front chamber 16 and a back chamber 18. The front chamber 16 is permanently connected to a partial vacuum source by a vacuum retaining valve 17 disposed in an aperture of the front wall of the casing 10. The outer peripheral edge of the membrane 12 is secured in leaktight manner onto the outer casing 10. The inner peripheral edge of this membrane terminates with a bead received in leaktight manner in an annular groove formed on the outer peripheral surface of a piston hub 20 disposed along the axis X-X' of the booster. This hub 20 extends backwards in the shape of a tubular part 22 which passes in leaktight manner through the back wall of the casing 10. The leaktightness of this passing-through is ensured by a reinforced annular seal 24 which is fastened by a ring 26 in a tubular central part extending backwards the back wall of the casing 10.
A compression spring 28 interposed between the skirt 14
REFERENCES:
patent: 4330996 (1982-05-01), Becht et al.
patent: 4339992 (1982-07-01), Schanz
patent: 4418611 (1983-12-01), Tateoka et al.
patent: 5090298 (1992-02-01), Gautier et al.
Castel Philippe
Gautier Jean Pierre
Meynier Guy
Perez Revilla Miguel
Verbo Ulysse
AlliedSignal Europe Services Techniques
Look Edward K.
Palguta Larry J.
Ryznic John
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