Power plants – Pressure fluid source and motor – Pulsator
Patent
1996-01-16
1998-08-25
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
60403, 180271, B60T 1300
Patent
active
057972648
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to braking assemblies consisting of pneumatic brake boosters and of master cylinders of the type used for braking in motor vehicles.
BACKGROUND OF THE INVENTION
Pneumatic boosters conventionally include a casing fastened to a wall separating the cabin from a front compartment of a vehicle, and are actuated by a control rod, the rear end of which is connected to a brake pedal situated in this cabin.
In parallel, master cylinders conventionally include a body formed with at least one flange for fastening the master cylinder onto the front wall of the casing of the booster.
Many documents illustrate this type of braking assembly. They are usually located in the front compartment of a motor vehicle, generally containing the engine of the vehicle, the booster being fastened via its rear wall to the bulkhead providing separation between this front compartment and the cabin, and the master cylinder being fastened to the front wall of the booster. The rod for controlling the booster passes through an opening in the bulkhead and it is actuated by a brake pedal in the cabin.
When the vehicle is involved in a frontal or almost-frontal collision with another vehicle or with a stationary obstacle, the structure and bodywork of the vehicle are designed to deform progressively in order to absorb the greatest possible proportion of the energy involved in this collision.
Nevertheless, it is often the case that the engine, or the load transported in the front compartment of the vehicle, moves back under the effect of such a collision and interferes with the master cylinder. Such interference may result in the application to the master cylinder of a force directed along its axis, or of a force forming a certain angle with its axis. However, in any case the result is that the master cylinder urges the casing of the booster backwards towards the bulkhead of the vehicle, via its fastening flanges.
It therefore follows that the consequences of a frontal or almost-frontal collision, owing to the arrangement of the booster/master cylinder assembly in the front compartment of the vehicle, are first of all to cause the bulkhead to move back under the action of the casing of the booster, regardless as to whether or not the booster is equipped with through bolts, and also of causing the brake pedal to move back, it being possible for this to cause the driver of the vehicle serious injuries.
Various documents have already attempted to provide a solution to this problem. Document FR-A-2,437,337 for example makes provision for the sector of bulkhead placed above the space where the driver places his feet to be situated as close as possible to the steering, and for the frontal sector of the bulkhead to extend forward as far as a fixed articulation point provided in the front compartment, to which point there is fastened a support which is intended to take a braking assembly as defined above, this support being shaped and arranged so that it can pivot about this stationary articulation point under the effect of a significant thrust.
Document FR-A-482,547 for its part makes provision for fastening the booster to the upper member of a shock-absorbing structure, the axis of the brake pedal being mounted at the top of the upper member which ends, via a cutout, at a larger and deformable lower member connected to the bulkhead, the lower member being shaped so that the deformation travel available at its upper part is greater than at its lower part.
These two documents of the prior art therefore essentially envisage the same solution, namely of interposing between the booster and the bulkhead a rocking or deformable structure for absorbing the energy generated during a collision. Such a solution does, however, have a significant drawback in the case where the front compartment constitutes the engine compartment of the vehicle. Indeed, in this case, the complexity of modern engines, and also the compactness of the vehicles which is desired by the car manufacturers, means that there is little or no space available
REFERENCES:
patent: 5634337 (1997-06-01), Gautier et al.
Cobianchi Flavio
Verbo Ulysse
Bosch Systems de Freinage
Karimi Bijan N.
Look Edward K.
McCormick Jr. Leo H.
LandOfFree
Master cylinder and pneumatic brake booster assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Master cylinder and pneumatic brake booster assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Master cylinder and pneumatic brake booster assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-29622