Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-11-06
1994-08-09
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
13759617, 303 87, F15B 912, F16B 2108, B60K 2816, B60T 836
Patent
active
053359836
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is related to a hydraulic unit for hydraulic control and regulation of apparatuses and more particularly to hydraulic brake pressure control units in anti-lock control systems or traction slip control systems for automotive vehicles.
Hydraulic units for the control or regulation of pressure agents have a wide range of application in industrial hydraulics. Particular importance has to be attributed to the use of hydraulic units for vehicle equipment, since the pressure agent streams provide high accuracy control even under extraordinary operating conditions.
Especially in regard to the integration of hydraulic units within the vehicle, additional active as well as passive measures have been considered, beyond strictly functional capabilities, which increase satisfaction as far as serviceability and low noise of the system are concerned.
Along these lines, mention has to be made of the arrangement as per the German patent application published without examination, No. 3,913,352 regarding a pressure pulsation damper within a hydraulic unit for brake systems with traction slip control. Depending on their properties of elastic deformation, these pulsation dampers absorb the sound emissions originating from the switching frequencies of the solenoid valves, so that the noise level which is felt to be annoying can be reduced. However, a disadvantage of this method results from the fact that elastic deformation of the pressure pulsation damper also necessarily leads to an undesired increase in the volume of pressure agent being taken in.
SUMMARY OF THE INVENTION
It is, therefore, the object of the invention to preserve the simple set-up of the existing hydraulic unit while devising a method by which the noise level from switching the solenoid valves is effectively reduced without necessitating any additional intake of pressure agent volume during operation.
According to the invention, this object is attained by integrating within the body which accommodates the solenoid valves, a hydraulically actuatable slide valve to control the volume of the pressure agent based on the positions of the solenoid valves.
Thus, the invention is based on the concept that while the outlet solenoid valve is open, the volume of pressure agent being taken in from the pressure agent source and flowing to the pressure agent consumer through a slide valve integrated into the valve accommodation body is limited by insofar as a control edge which operates at the slide valve. The control edge reduces the pressure agent flow due to the lifting stroke motion of the slide valve which is dependent on the pressure differential.
In order to ensure a restricting function, the orifice is integrated directly in the slide valve and, precisely, in the range of an annular groove which links the pressure agent source to the inlet solenoid valve in contrast to the customary arrangement of the orifice within the solenoid valve being switched to free passage in its normal position.
The inventive concept is realized by forming the control edges which limit the volumetric stream by the defining surfaces of the first annular groove and the defining surfaces of a supply duct which is connected to the pressure agent source.
An advantageous pressure agent connection is created between the pressure agent source and the solenoid valve through a pressure agent duct extending substantially in axial direction within the slide valve. A hydraulic connection exists between the first annular groove and another annular groove which extends up to the solenoid valve switched to free passage in its normal position.
The actuation of the slide valve results from controlling the hydraulic pressure acting on it. A compression spring is extended to abut against a front surface of the slide valve within an extended accommodating bore during the normal positioning of the slide valve. Depending on the switching position of the solenoid valve which is closed in its normal position, the front surface of the slide valve facing the compression
REFERENCES:
patent: 4175794 (1979-11-01), Pauwels
patent: 4690465 (1987-09-01), Takeda et al.
patent: 5005919 (1991-04-01), Shuey et al.
patent: 5035469 (1991-07-01), Geilen et al.
patent: 5205621 (1993-04-01), Moinard et al.
Beck Erhard
Sonnenschein Georg
Graham Matthew C.
ITT Corporation
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