Brake pressure modulator for a brake skid-controlled brake system for automotive vehicles
AssigneeAlfred Teves GmbH
InventorHans-Christof Klein
Life of this patent
Estimating the term…
Abstract
A brake pressure modulator for a brake skid-controlled brake system for automotive vehicles is disclosed including a volume take-up device including a plunger disposed in a cylindrical chamber and preloaded by a spring into the cylindrical chamber. The plunger is closely guided out of the cylindrical chamber to the outside and is connected to a driving mechanism which upon occurrence of a brake skid signal at least in part pulls the plunger out of the cylindrical chamber to expand the volume thereof and to thereby decrease the brake pressure. Provided between the driving mechanism and the plunger is a gear of a transmission ratio variable depending on the plunger position.
Claims10
A brake pressure modulator for a brake skid-controlled brake system for automotive vehicles, comprising at least one volume take-up means provided in a hydraulic conduit leading from a master cylinder to at least one wheel cylinder of said brake system, the volume take-up means including a plunger disposed in a cylindrical chamber, said cylindrical chamber in communication with the wheel cylinder hydraulic conduit, means for preloading the plunger into the cylindrical chamber, the plunger being closely guided out of the cylindrical chamber to the outside thereof and being connected with a vacuum-actuated driving mechanism means adapted to at leas partly retract the plunger from the cylindrical chamber upon occurrence of a brake skid signal to expand the volume of the cylindrical chamber and to thereby correspondingly decrease the brake pressure in said hydraulic conduit, variable transmission gear means provided between the driving mechanism means and the plunger, said variable transmission gear means adapted to vary its transmission ratio in response to the plunger position so that an actuating force applied by the driving mechanism means to the plunger during an entire withdrawal operation of the plunger from said cylindrical chamber remains substantially constant, wherein the driving mechanism means is a piston/cylinder arrangement in communication with an atmospheric pressure and a vacuum source, and wherein connected to the atmospheric pressure and the vacuum source is a pneumatic blocking arrangement means for blocking movement of the plunger until a predetermined vacuum is available to apply a predetermined required pressure to the driving mechanism.
A brake pressure modulator for a brake skid-controlled brake system for automotive vehicles, comprising at least one volume take-up means provided in a hydraulic conduit leading from a master cylinder to at least one wheel cylinder of said brake system, the volume take-up means including a plunger disposed in a cylindrical chamber, said cylindrical chamber in communication with the wheel cylinder hydraulic conduit, means for preloading the plunger into the cylindrical chamber, the plunger being closely guided out of the cylindrical chamber to the outside thereof and being connected with a vacuum-actuated driving mechanism means adapted to at leas partly retract the plunger from the cylindrical chamber upon occurrence of a brake skid signal to expand the volume of the cylindrical chamber and to thereby correspondingly decrease the brake pressure in said hydraulic conduit, variable transmission gear means provided between the driving mechanism means and the plunger, said variable transmission gear means adapted to vary its transmission ratio in response to the plunger position so that an actuating force applied by the driving mechanism means to the plunger during an entire withdrawal operation of the plunger from said cylindrical chamber remains substantially constant, further comprising a vacuum brake force booster and a master cylinder to which force is applied by the brake force booster and to which are connected, through the volume take-up means, the wheel brake circuits, a pneumatic actuator of a blocking mechanism connected to said plunger is connected to a vacuum source and to the chamber of the brake force booster to which controlled air pressure is applied, respectively.
Dependencies are inferred from the claim text.