Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-12-21
1995-02-14
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
137504, 138 31, 303 87, B60T 836
Patent
active
053888995
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
This invention relates to a solenoid valve, in particular for slip-controlled brake systems of automotive vehicles, having a valve governor integrated into the valve body between a first and second pressure medium connections providing pressure medium volume control.
In industrial hydraulic engineering, there are a variety of applications for solenoid valves for controlling and regulating pressure media. Likewise, the use of solenoid valves in the equipment of vehicles is of great importance since the flows of pressure medium have to be controlled with great precision even in case of extraordinary operating conditions.
When integrating solenoid valves within the vehicle, it is of special importance to consider additional measures, both active and passive, that go beyond the actual operativeness and are a benefit to the pursuit of comfort with regard to easy service and noiselessness of the respective system controlled by solenoid valves.
As regards the desired noiselessness, reference is made, for instance, to the arrangement of pressure pulsation dampers within a valve block for a slip-controlled brake system as is known from German Published Patent Application (=DE-OS) No. 39 13 352. Because of their elastic deformability, these pulsation dampers are able to absorb the noise emissions originating from the switching frequencies of the solenoid valves so that it is possible to lower the noise level felt to be a disturbance. A disadvantage of this method, however, results from the fact that an elastic deformation of the pressure pulsation damper automatically will also result in an undesired increase in the pressure medium volume intake.
It is thus an object of this invention to set forth a solution which effectively reduces the noise level, depending on the solenoid valve operating positions, and its propagation, while maintaining an unaltered simple design of the solenoid valves as far as possible and without having to accept an additional volume intake during operation.
In accordance with this invention, this task is solved by arranging a control piston, which is integrated in the valve accommodating body and which regulates the volume or the pressure, between the pressure medium connection of the pressure medium source and the valve closure member of the solenoid valve which is open in the basic position, when currentless, with the control edge, which is effective on the control piston, adjusting the pressure medium flow in dependence on the piston stroke.
These constructional measures as well as the further characteristics and advantages of the claimed invention will be represented and explained in more detail in the following, reference being made to several drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view through a valve unit composed of a solenoid valve and a volume governor.
FIG. 2 is an enlarged cross-sectional view of the volume governor shown in FIG. 1.
FIG. 3 is a measurement record, illustrating the volume flow as a function of the pressure.
FIG. 4 is a diagram, illustrating the pulse volume as a function of the pulse length in consequence of the electromagnetic excitation of the valve .
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows the cross-section of the solenoid valve with the volume governor 4 arranged coaxially with regard to the valve tappet 21. The solenoid valve has an armature 15 guided in a valve sleeve 14, the valve tappet 21 extending along said armature 15 into the valve accommodating body 3. On the tappet end averted from the armature 15, there is a ball-shaped valve closure member 2 forming an open annular clearance cross-section at the valve seat 7 in the electromagnetically non-excited position. In its open end area, the valve sleeve 14 is caulked to a magnet core 17 in the valve accommodating body 3. Referring to the drawing, the volume governor 4 is illustrated beneath the valve seat 7 disposed in an extension of the stepped bore 16 accommodating the valve seat. The volume governor 4 has a cup-shaped governor housin
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patent: 3277924 (1966-10-01), Nezworski
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patent: 4844119 (1989-07-01), Martinic
patent: 5035469 (1991-07-01), Geilen et al.
Timmermans Marc
Volz Peter
Alfred Teves GmbH
Graham Matthew C.
Lewis J. Gordon
Seitter Robert P.
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