Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Utility Patent
1998-11-13
2001-01-02
Mar, Michael (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C303S010000
Utility Patent
active
06168245
ABSTRACT:
PRIOR ART
The invention is based on a brake system for motor vehicles.
One such brake system has been proposed in German Patent Disclosure 196 19 985 A1, published on May 28, 1997, after the priority filing date of the present application; in this reference, the self-aspirating charge pump, for instance in the event of traction control, supplies the high-pressure pump with brake fluid from the brake fluid supply container of a master cylinder, so that the brake fluid can generate brake pressure for pumping to the wheel brake in accelerated fashion.
A hydraulic brake system of this generic type is also known from European Patent Disclosure EP 0 482 367 A1; it has a charge pump with which, in traction control, brake fluid from a supply container of a master cylinder can be pumped both to the intake side of a high-pressure pump and directly into a brake line to which wheel brakes are connected. In such a brake system, it must be assured that no air will enter the system along the way via the charge pump. This could happen from an inadequate filling of the brake fluid supply container, or if the intake line is severed, not mounted, or comes loose.
In a self-aspirating hydropump with a defective intake line, it is therefore known from German Patent Disclosure DE 40 11 668 Al for a short-circuit connection between the suction chamber and the pressure chamber of the pump to be broken. In this defective state, the pump is incapable of building up pressure, so that no air can be fed into the system.
ADVANTAGES OF THE INVENTION
The brake system according to the invention has the advantage over the prior art that in the event of a defect, pumping of air through the charge pump into the system is avoided even if the intake line is properly connected to the charge pump. That is, as soon as the liquid level in the intake line reaches the siphon, su(h a large quantity of air is aspirated by the charge pump that this abruptly ceases any further pumping.
By the provisions recited herein advantageous refinements of and improvements to the brake system.
Thus the advantageous characteristic defined can be attained in a simple way by suitably laying the intake line, or by means of a hose shaped according to the invention or a bentor curved tube.
The advantageous feature of the invention disclosed moreover provides freedom from the aforementioned mounting requirements for the intake line, because the siphon is embodied entirely directly on the pump, in the housing thereof.
REFERENCES:
patent: 5017101 (1991-05-01), White
patent: 5401083 (1995-03-01), Altmann et al.
patent: 5501514 (1996-03-01), Resch et al.
patent: 5927824 (1999-07-01), Pahl et al.
patent: 5947567 (1999-09-01), Jonner et al.
patent: 42 26 646 (1994-02-01), None
Hummel Rolf
Krenz Guenter
Mank Erika
Pahl Arnold
Siegel Heinz
Greigg Edwin E.
Greigg Robert E.
Mar Michael
Robert & Bosch GmbH
Talavera Melanie
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