Power plants – Pressure fluid source and motor – Pulsator
Patent
1990-11-13
1993-02-09
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
60589, 60581, 60535, 92130R, 92 98D, 913691, B60T 1352, B60T 1357
Patent
active
051844680
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention is related to a pneumatic brake power booster, preferably to a vacuum brake power booster, for fluid, in particular hydraulic, brake systems of automotive vehicles.
BACKGROUND OF THE INVENTION
Vacuum brake power boosters are devices which utilize the pressure gradient between the vacuum in the suction pipe of an Otto carburetor engine and the atmospheric ambient pressure as a source of power to boost the hydraulic pressure which is generated in the master cylinder by the foot effort of the driver.
A vacuum pump which is driven by the engine and which furnishes the required vacuum is used, as a rule, in two-stroke engines or Diesel engines.
Vacuum brake power devices of this kind are, among others, described in detail in the Brake Handbook by Alfred Teves GmbH, 8th edition, from page 94 onward.
From the German patent application published without examination, No. 29 35 286, a brake power booster for a vehicle brake unit is known. That booster includes a booster housing having a front and a rear housing wall, a pedal-actuated input member axially aligned with an output member, a movable wall sub-dividing the interior space of the housing into two chambers and suited to apply a force to the output member when the chambers are subjected to a pressure differential depending on the force exerted on the input member, and a power transmission device extending between the front housing wall and the rear housing wall and which, during operation, transmits braking reaction forces which would otherwise be transmitted by the housing.
In the forementioned German patent application published without examination, the power transmission device is provided with a pipe which is coaxial with the input member and with the output member and which extends through the movable wall.
Furthermore, a mechanically controlled brake device for an automotive vehicle is known which includes a master cylinder and a booster utilizing the pressure differential between a vacuum and the atmospheric pressure. The booster has a vacuum housing which includes a cup section and a cover section, a push rod which serves to initiate the braking action, and structure enabling fixation to a splash shield.
The structure for fixation is arranged in the vicinity of the master cylinder, preferably on that side of the cup section which faces the master cylinder.
In addition, FIG. 1 of U.S. Pat. No. 3,137,361 shows a brake power booster whose housing presents a bearing block for the brake pedal.
SUMMARY OF THE INVENTION
The present invention has the following objects, outlined below.
As a consequence of the sophisticated engine design of modern automotive vehicles and due to the more spacious passenger compartments of new models, the mounting space for brake power boosters becomes smaller and smaller.
Particular mounting problems are encountered with the axial extension of conventional assemblies which are comprised of a master cylinder, of a brake power booster, and of a brake pedal.
It is an object of the present invention to drastically reduce the mounting space requirements for brake power boosters and, in particular, to reduce the overall axial length.
In addition, it is an object of the present invention to create improved conditions for the automatic and efficient assembly of the brake power booster, of the brake pedal, of the clutch pedal, and of the clutch master cylinder in the vehicle. In particular, the complicated way of fitting the push rod in the passenger compartment which was necessary is avoided.
It is another object of the present invention to relieve the housing sections of the brake power booster of the well-known bending forces.
Another object of the invention is to reduce the weight of the brake power booster.
Moreover, suction noises in the passenger compartment are excluded. The idle travel occurring on actuation of the brake power booster is reduced. In the case of dual-circuit brake systems, a pressure differential in the brake circuits is prevented. In addition, the design allows for an adjustme
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Birkenbach Alfred
Harth Ralf
Schonlau Juergen
Lewis J. Gordon
Look Edward K.
Ryznic John
Seitter Robert P.
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