Power plants – Pressure fluid source and motor – Pulsator
Patent
1993-09-30
1995-10-03
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
91376R, B60T 1300, F15B 910
Patent
active
054542243
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a brake-booster device for a motor vehicle, comprising, as members, a master cylinder, a pneumatic booster actuating the master cylinder, a brake pedal actuating the booster through the intermediary of a control rod, an apron, and mechanical means designed to maintain the members of the device in a predetermined functional configuration and including a pedal support and an aperture in the bulkhead, the booster per se comprising a leaktight casing formed of two half-shells the first of which is connected to the master cylinder and the second to the brake pedal.
These devices are well known in the prior art and are in practice used on all private vehicles equipped with assisted braking. In particular, a device of the previously defined type is described in the document GB-A-2 018 923.
One of the permanent objectives in the design and the production of such devices is to reduce their cost and/or their weight while seeking to improve their functional qualities.
In particular, one of these objectives is to reduce the quantities of material required for the production of these devices, while conserving or improving their rigidity and their mechanical strength in operation.
Although the device known from the document GB-A-2 018 923 has this same objective, it requires the use of a thick holding flange which substantially increases the weight of the booster.
The device of the invention is included in this process and attains this objective by providing that the mechanical means mentioned above comprises:
an aperture in the bulkhead;
a protuberance of the first half-shell, this protuberance being engaged through the aperture of the apron and closing it at least partially;
a reinforcement in the shape of a hat with a rim, pushed home inside the protuberance, this reinforcement having on the one hand a pierced bottom supporting the master cylinder and in which the latter is engaged, and on the other hand a rim pressing the first half-shell, at the periphery of its protuberance, onto the edge of the aperture of the apron; and
at least first attachment means for attaching to the apron the pedal support at a first attachment point of the latter.
Preferably, this device further comprises at least second attachment means for attaching to the apron the pedal support at a second attachment point of the latter, the first and second attachment points being disposed on either side of the booster in substantially symmetrical manner with respect to the control rod.
Moreover, it is advantageous for the apron to have a cavity at the bottom of which is pierced the said aperture and in which is housed the booster with the exception of its protuberance, and for the first and second attachment points to be disposed on either side of this cavity.
According to one embodiment, which is very simple to implement, the pedal support comprises two side plates connected to one another and is obtained by bending a single part.
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a view in cross section of a device according to the invention, made along line I--I of FIG. 2; and
FIG. 2 is a front view of this device, seen in the direction of the arrow II appearing in FIG. 1.
The device of the invention comprises a master cylinder 1, a booster 2 supporting the master cylinder and adapted to control it, a brake pedal 3 capable of actuating the booster 2 through the intermediary of a control rod 4, an apron 5 belonging to the vehicle, and various mechanical means for attaching the assembly, rigidifying it and more generally maintaining it in its functional configuration, these means including a pedal support 6.
The booster 2 comprises a leaktight casing formed of two half-shells 7a, 7b the first of which is connected to the master cylinder and the second to the brake pedal.
As shown in FIG. 1, the apron 5 is pierced with a circular aperture 5a through which passes with a minimal clearance a cylindrical protuberance 8 of the first half-shell 7a of the bo
REFERENCES:
patent: 2731797 (1956-01-01), Ayers et al.
patent: 4433614 (1984-02-01), Takeuchi et al.
patent: 4538503 (1985-09-01), Hachiro
patent: 4586580 (1986-05-01), Spielmann et al.
patent: 5193344 (1993-03-01), Meynier
Castel Philippe
Laurent Jacques
AlliedSignal Europe Services Techniques
Look Edward K.
McCormick Jr. Leo H.
Nguyen Hoang
Palguta Larry J.
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