Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1994-04-21
1995-08-22
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
251122, 25112908, B60T 836, F16K 3106, F16K 4700
Patent
active
054433096
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a solenoid valve, in particular for hydraulic brake systems with slip control.
There are many practical applications for such conventional, well-known valves for controlling the flow of fluids in slip-controlled hydraulic brake systems.
German Patent Application No. P 37 01 019.0 discloses a solenoid valve for a slip-controlled hydraulic brake system consisting of a valve seat which receives a valve tappet excitable by a solenoid and guided in an axially movable manner within a valve housing and having an annular flow cross-section controllably arranged between the valve tappet and the valve seat and communicating with the pressure medium channels which project into the valve housing. In order to control all the brake circuits, several valves are combined advantageously in a valve block housing, so that a space-saving positioning of all solenoid valves is ensured in an economical, low-cost manner.
A shortcoming of this known valve design is its noise behavior during the operating phases of the valve which is caused by the non-uniform flow behavior and, hence, by the discontinuous flow bypassing the valve closure member because of the binary valve operating positions.
In order to reduce the development of noise and, hence, the transmission of sounds, at present, considerable passive, as well as active, noise dampening efforts have been tried. However, all such known efforts have involved considerable cost and the results have required optimizing.
SUMMARY OF THE INVENTION
It is, thus, an object of the present invention to provide an improved solenoid valve of the type referred to above having a relatively simple design and a considerable reduction of the noise behavior during the valve operating phases, while avoiding the aforementioned disadvantages as well as simultaneously ensuring operational reliability.
According to the present invention, this object is achieved by providing at least one recess of defined length, width and depth on the circumferential surface of the valve tappet which is remote from the armature, the recess partially extending in the longitudinal direction.
Other characteristics and advantages of the present invention will be explained in more detail, with reference being made to the drawing.
BRIEF DESCRIPTION OF THE DRAWING
The single figure is a cross-sectional view of a solenoid valve constructed in accordance with the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The drawing shows the cross-section of a solenoid valve, constructed in accordance with the present invention, which is open in the electromagnetically non-excited basic position. The valve housing 10 is preferably manufactured to receive further solenoid valves in valve-block-type construction. In particular, in the drawing, a magnet core 9 is illustrated which is covered with a valve sleeve 11 in the valve housing 10 and which has a truncated-cone-type taper facing the armature 1. Adapted to the contour of the truncated cone of the magnet core, the front face of the armature 1 which faces the magnet core 9 has a funnel-shaped cavity. In the illustrated open, currentless operating position of the solenoid valve, a compression spring 12 holds the armature 1 spaced from the magnet core 9 so as to define an air gap. An armature-side valve tappet 2 extends through the compression spring 12 and, thus, simultaneously provides support against buckling of individual coils of the spring. The portion of the valve tappet 2 which extends away from the armature 1 extends coaxially through the magnet core 9 into a closure damping chamber 7 between a sleeve 4 and a valve seat 5. Situated both below and above the closure damping chamber 7 are the pressure medium channels 13 which are placed in fluid communication by the solenoid valve. The sleeve 4 has a disk-type, cup-shaped housing whose knife-type-taper centering ring 6 can overlap with a notch-type recess 3 provided on the end of the valve tappet 2 remote from armature 1. The particular design of the sleeve 4,
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Butler Douglas C.
ITT Automotive Europe GmbH
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