Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1995-04-10
1996-11-26
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031192, B60T 1500, B60T 838, F16B 1308
Patent
active
055778135
DESCRIPTION:
BRIEF SUMMARY
This application is the U.S. national-phase application of PCT International Application No. PCT/EP93/02543.
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic unit for slip-controlled brake systems.
The German patent application P 41 07 625.7 discloses a hydraulic unit for slip-controlled brake systems for automotive vehicles, the valve accommodating member of which is directly flanged to a central housing containing the accumulator and pressure generating and driving elements. These functional elements are arranged in location bores which are distributed over the central housing so that, among other things, a number of working positions have to be considered in the work program of the automatic machine tool during the production of the complicated central housing and the valve accommodating member which has to be manufactured separately in the machining center. Besides, the size of the hydraulic unit cannot be reduced due to the described structure, so that the mounting position or the mounting place is more difficult to select.
SUMMARY OF THE INVENTION
An object of the present invention is, therefore, to create a hydraulic unit of a compact size which can be produced precisely, at low cost and in a simple way.
According to the present invention, this object is achieved by a valve accommodating member which accommodates the accumulator, valve, and pressure generating and driving elements in such a way that the pressure generating and driving elements can be arranged between the two valve rows spaced from each other, with the housing material of the valve accommodating member projecting laterally relative to the valve rows and used for accommodating the accumulator elements.
The embodiments of the present invention will be described in more detail with reference to the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 is a top view of the hydraulic unit;
FIG. 2 is a cross-sectional view of the hydraulic unit taken along line A--A of FIG. 1;
FIG. 3 is a cross-sectional view of the hydraulic unit taken along line B--B of FIG. 2;
FIG. 4 is a cross-sectional view of the hydraulic unit taken along line C--C of FIG. 2;
FIG. 5 is a sectional view of an alternative embodiment presenting the location bore forming the damping chamber and its hydraulic connection;
FIG. 6 is a sectional view of another embodiment of the damping chamber;
FIG. 7 is a sectional view of the location bore including the pressure accumulator piston.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the basic arrangement of the valve elements 1, 1', pressure generating element 5, and driving elements 6 in the valve accommodating member 3. The location bore 8 which accommodates the driving elements 6 consisting of an electric motor and an eccentric drive and the valve elements 1, 1' are oriented parallel to the valve axis. For this reason, the location bore 7 of the pressure generating element 5, consisting of a double-flow radial piston pump, extends transversely to the axis of the electric motor and the valve axis. The pressure generating element 5 is, therefore, arranged between the connection planes of the valve elements 1, 1' and the electric motor.
FIG. 2 shows a cross-section through the valve accommodating member 3 taken along line A--A of FIG. 1. The valve accommodating member 3 has an essentially square block form, in which are arranged the two parallel rows of valve accommodating bores 2, 2'. The location bore 7 for the pressure generating element 5 is arranged between the two valve rows x, y and extends parallel to their axes. The location bores 9, 10 which accommodate the pressure accumulator piston 12, 12' acting as part of the accumulator elements are arranged perpendicularly to the valve accommodating bores 2, 2' outside the two valve rows x, y. The bores for the pressure fluid 4, 13 connect the valve accommodating bores 2 of the electromagnetically closed valve elements 1, 1', acting as outlet valves in their normal position, with the location bores 9, 10 of the accumulator
REFERENCES:
patent: 4633759 (1987-01-01), Schulze
patent: 5022717 (1991-06-01), Heibel et al.
patent: 5035469 (1991-07-01), Geilen et al.
patent: 5172956 (1992-12-01), Klose et al.
patent: 5244262 (1993-09-01), Kehl et al.
patent: 5362141 (1994-11-01), Beck et al.
patent: 5449226 (1995-09-01), Fujita et al.
Ebertshauser, H., Fluidtechnik Von A Bis Z, Vereinigte Fachverlage, Krausskopf/Ingenieur-Digest, pp. 259, 260, 1989.
Graham Matthew C.
ITT Automotive Europe GmbH
Lewis J. Gordon
Twomey Thomas N.
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