Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-03-27
1991-12-17
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
605471, 60591, 921693, B60T 13567, B60T 844
Patent
active
050729969
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a brake actuating assembly for motor vehicles comprising pressure in the brake circuit, one partition movable in piston-like manner and braking force booster for transmitting reaction forces of the master brake cylinder to a vehicle wall and the intermediate wall of the braking force booster.
DE 2845794 Al discloses a braking force booster in various constructions which in the manner described above is combined by means of a connecting pin with a master brake cylinder to form a brake actuating assembly. Such an assembly has also already been supplemented by a modulator which for modulating the pressure in at least one brake circuit has been connected to the master brake cylinder. The modulator has also been secured mechanically to the master brake cylinder.
DE 3611045 Al further discloses a brake actuating assembly in which a hydraulic high-pressure braking force booster and a modulator are mounted on a common flange which is configured for securing to the splashboard of a vehicle. Mounted on an end plate of the braking force booster remote from said flange is a master brake cylinder having four wheel brake cylinder connections. Secured to each of said connections is an electromagnetic valve controlled by the modulator having a screw-in thread for this purpose.
Common to both the brake actuating assemblies described above is that the mechanical and hydraulic connection between the master brake cylinder and at least one of the valves associated with the modulator is simple to establish and when necessary also simple to release again. The additional loading of the master brake cylinder by a modulator connected thereto also appeared acceptable in brake actuating assemblies of the type described at the beginning because the master brake cylinder is in turn secured via the connecting bolts or pins reliably to a vehicle wall without appreciably subjecting the braking force booster itself to a load.
In assemblies of the type corresponding to the preamble which are made in large series production however in operation in some cases damage to the master brake cylinder has been observed which could not be explained by the mechanical and hydraulic loads to be expected and for this reason material or machining faults were suspected. With such damage, there is fundamentally the danger that it will not be noticed for a long time and suddenly lead to complete failure of the master brake cylinder.
The invention is based on the problem of considerably reducing, if not completely excluding, the danger that under certain construction, material and production conditions leakage occurs at the master brake cylinder.
This problem is solved according to the invention in a brake actuating assembly of the type described at the beginning in that the modulator is likewise mounted with bypassing of the master brake cylinder on at least one connecting pin which extends through the housing of the braking force booster.
This achieves a mechanical separation of modulator and master brake cylinder; the necessary connection lines between the two are adequately yieldable so that they can transmit only negligibly small mechanical forces.
The invention is based on the recognition that the previously only very rarely occurring damage, nevertheless very serious because of their possibly grave consequences, to master brake cylinders of brake actuating assemblies according to the preamble are due to the fact that the modulator valves opening and closing in rapid succession when the modulator becomes active generate vibrations in a modulator connected mechanically to said mater cylinder which can superimpose themselves on vehicle vibrations and other factors loading the master brake cylinder, in particular the hydraulic pressures obtaining therein, in such an unfavourable manner that in the cylinder wall of the master brake cylinder a crack arises which sooner or later can result in a leak.
In the brake actuating assembly according to the invention, due to the mounting of the modulator separate from the master brake cylinder
REFERENCES:
patent: 3727993 (1973-04-01), Schenk
patent: 3752536 (1973-08-01), Macheu
patent: 4339921 (1982-07-01), Schanz
patent: 4377069 (1983-03-01), Kobayashi
patent: 4402256 (1983-09-01), Ando
patent: 4594854 (1986-06-01), Takeuchi et al.
patent: 4827720 (1989-05-01), Flynn et al.
patent: 4828337 (1983-06-01), Wagner et al.
Gilles Leo
Heibel Helmut
Lucas Industries Public Limited Company
Muratori Alfred
Oberleitner Robert J.
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