Fluid-pressure and analogous brake systems – Automatic – Supplementary reservoir pipe
Reexamination Certificate
1999-10-01
2001-06-19
Oberleitner, Robert J. (Department: 3613)
Fluid-pressure and analogous brake systems
Automatic
Supplementary reservoir pipe
C138S137000, C428S036900
Reexamination Certificate
active
06247763
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is based on a pressure fluid reservoir for a vehicle hydraulic brake system.
German patent disclosure DE 41 28 386 A1 discloses a pressure fluid reservoir that is for a vehicle hydraulic brake system and defines this generic type. The vehicle brake system includes a master cylinder, a number of wheel brake cylinders for a number of wheel brakes, and a wheel slip regulating device that is disposed between the master cylinder and the wheel brake cylinders, which is equipped to limit drive slip of drivable vehicle wheels through the use of wheel brakes. Wheel brake cylinders of these wheel brakes are connected to the wheel slip regulating device by means of brake lines and the wheel slip regulating device is in turn connected to the master cylinder through at least one pressure fluid reservoir with the aid of at least one brake line. The wheel slip regulating device has at least one pump which is supplied with pressure fluid from the pressure fluid reservoir and/or the master cylinder in order to produce pressure that can be initiated in order to introduce brake pressure into the wheel brake cylinders for the purpose of drive slip limitation. Between two hydraulic connections, the pressure fluid reservoir has a hose membrane as a reservoir element, and inside the hose membrane has an inner support element that partially fills the normal internal cross-section of this hose membrane, an air-permeable external support element that encloses the hose membrane and against which the hose membrane can be placed, and a casing which is likewise air-permeable and encompasses the outer support element, for example in a play-free manner. The inner support element, the outer support element, and the casing are embodied as rigid and have relatively large diameters in relation to their lengths. When the pump aspirates pressure fluid in order to carry out drive slip regulation, then it predominantly withdraws the fluid from the hose membrane of the pressure fluid reservoir, wherein the diameter of the hose membrane temporarily becomes smaller. As soon as the pump is no longer aspirating and/or pressure fluid is being pushed to the wheel slip regulating device by means of the master cylinder, the hose membrane assumes its original dimensions once more and thereby rests against the outer support element. With prevailing master cylinder pressure, the outer casing protects the outer support element from bursting since this would result in a bursting of the hose membrane.
It can be viewed as disadvantageous that this pressure fluid reservoir, if it is tightly screw-connected to wheel slip regulating device, prevents it from being accommodated in the vehicle. This pressure fluid reservoir can also be accommodated anywhere between the wheel slip regulating device and the master cylinder, but this requires the installation of a first main brake line section between the master cylinder and the pressure fluid reservoir and a second main brake section between the pressure fluid reservoir and the wheel slip regulating device with the result that, four screw connections must be mounted in the vehicle for this purpose.
OBJECT AND SUMMARY OF THE INVENTION
The pressure fluid reservoir according to the invention has the advantage over the prior art that it can be installed in the form of an uninterrupted brake line, and thereby assumes its function. Due to flexibility, the pressure fluid reservoir according to the invention is about as easy to install as a conventional main brake line made of flexible metal tubing or hose material. Thus clearly, few assembly costs are incurred and the accommodation of the wheel slip regulating device inside the vehicle is not hindered.
Advantageous improvements and updates of the pressure fluid reservoir are possible by means of the measures taken hereinafter.
The inner support element can be inexpensively manufactured and result in a favorable flexibility of this support element so that the installation of the pressure fluid reservoir according to the invention in the vehicle is not hindered.
The wire ends are inexpensively keep away from the hose membrane and thus prevent damage to the hose membrane and the formation of leaks in the hose membrane.
A choice of material which renders the inner support element impervious to corrosion or mechanical stress is provided.
In carrying out the invention an advantage is that with the withdrawal of pressure fluid from the pressure fluid reservoir, ambient air travels through the outer support element to the outer circumference of the hose membrane so that a suction that can be produced by a pump is available essentially for elastically narrowing the hose membrane.
The casing is sufficiently flexible and through the influence of pressure produced in the master cylinder, the pressure fluid reservoir takes in as little additional pressure fluid as possible. This is because an additional admission of pressure fluid by the pressure fluid reservoir during normal braking would result in a disadvantageously long brake pedal path.
In carrying out the invention, an advantageous embodiment with regard to a desired long, malfunction-free operation time is provided.
The invention will be better understood and further objects and advantages thereof will become more apparent from the ensuing detailed description of preferred embodiments taken in conjunction with the drawings.
REFERENCES:
patent: 3665967 (1972-05-01), Kachnik
patent: 4096888 (1978-06-01), Stefano et al.
patent: 4136149 (1979-01-01), Payne
patent: 4206786 (1980-06-01), Wetmore
patent: 4651781 (1987-03-01), Kandelman
patent: 5622210 (1997-04-01), Crisman et al.
patent: 4128386 (1993-03-01), None
Ott Harald
Rehn Jan-Michael
Greigg Edwin E.
Greigg Ronald E.
Oberleitner Robert J.
Robert & Bosch GmbH
Rodriguez Pamela J.
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