Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1994-05-06
1995-08-08
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91376R, F15B 910
Patent
active
054389100
DESCRIPTION:
BRIEF SUMMARY
The present invention relates generally to pneumatic brake-boosters for motor vehicles, and more particularly to an assembly comprising a bulkhead separating the engine compartment from the passenger compartment and a pneumatic brake-booster.
Pneumatic brake-boosters for motor vehicles are fully known in the art and their operation will not be described again here. Generally speaking, they are composed of a leaktight, closed casing defining pneumatic operating chambers of the booster, said casing ending in the passenger compartment of the vehicle in the form of a tube into which an operating rod actuated by the brake pedal situated in the passenger compartment penetrates. The conventional master cylinder is situated at the other end of the casing.
The fastening of the booster to the bulkhead of the vehicle is a relatively complex operation. It is usually accomplished by placing the booster in position from the engine compartment, the tube of the booster being introduced into an opening formed in the bulkhead for the purpose. The booster casing or extensions of the casing carries or carry a plurality of fastening screws which pass through the bulkhead, and nuts are then fitted on the screws from the passenger compartment. Consequently, this operation is difficult to robotize and calls for simultaneous action in the engine compartment and in the passenger compartment. The documents GB-A-2 017 852 and GB-A-2 160 603 describe in particular such solutions for mounting the booster on the bulkhead.
The document FR-A-2 636 286 discloses an arrangement for fixing a pneumatic booster to the bulkhead of a motor vehicle, in which the tube of the booster has a frustoconical guide part and an annular groove into which there is clipped an elastic locking ring held against the bulkhead, in the passenger compartment, by means of several retention tabs.
Such a design also necessitates intervention in the passenger compartment in order to dispose the locking ring on the bulkhead. In addition, when the booster is mounted on the bulkhead, a considerable force must be applied on the case of the booster in order to expand the locking ring, so that reinforcement moldings must be provided on the bulkhead to prevent it from deforming.
The risk of deforming the case of the booster itself nevertheless remains.
This design is also dangerous because, if the booster is presented slightly askew with respect to the bulkhead, the locking ring will not be received in the entire annular groove, and the booster will only be very imperfectly mounted. In addition, even if the booster is correctly mounted, the inclined shapes of a lateral flank of the annular groove and of one face of the locking ring mean that, during a braking action, the locking ring is stressed to expand radially, and may even be expanded enough to release the booster into the engine compartment during intense braking, leaving the driver use only of his hand brake. In addition, upon each braking action, the locking ring is very highly stressed in shear, and the risks of breaking, deformation or accelerated aging resulting therefrom are not inconsiderable. Finally, if the slit allowing the locking ring to be expanded is behind the retention tabs, the booster can in no way be dismantled from the bulkhead.
The object of the present invention is to obviate these disadvantages and, in particular, to avoid action in the passenger compartment simultaneously with action in the engine compartment. It has the further object of saving time when mounting the booster on the bulkhead on the vehicle assembly line, while at the same time ensuring reliable fixing of the booster, the dismounting of the latter still being possible.
For this purpose, the tube of the booster is fastened to a collar which has a diameter substantially smaller than that of the opening formed in the bulkhead and which is provided with a peripheral groove.
According to the invention, a ring is housed in the peripheral groove and has, at least in part, an elastic edge projecting outwards. Thus, when the booster is in
REFERENCES:
patent: 3183789 (1965-05-01), Stelzer
patent: 4022112 (1977-05-01), Putt et al.
patent: 4274258 (1981-06-01), Shirai et al.
patent: 4433614 (1984-02-01), Takeuchi et al.
Gautier Jean Pierre
Perez Miguel
Verbo Ulysse
Bendix Europe Services Techniques
Look Edward K.
McCormick Jr. Leo H.
Nguyen Hoang
Palguta Larry J.
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