Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-07-29
2000-08-15
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303DIG10, B60T 850
Patent
active
061024945
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic assembly for a hydraulic controlling or regulating device, in particular for slip-controlled automotive vehicle brake systems.
German patent application No. 42 34 013 discloses a hydraulic assembly of the type mentioned above. For mounting the hydraulic assembly in automotive vehicles, special provisions are necessary to satisfy the specifications in terms of operability of the system (for example, a salt spray test) and, thus, to satisfy the later daily requirements during operation as regards the insusceptibility to salt and spraywater. Special corrosion protection arrangements and sealing and ventilation arrangements are required to ensure the operability of the assembly which, generally, render the assembly more expensive.
To overcome these conditions, special locations and positions for mounting the hydraulic assembly would be desirable. However, such requirements cannot always be complied with in view of the complex arrangement of the assembly in the entire vehicle compound and the limited mounting space available for integration of the systems in an automotive vehicle. Therefore, all relevant components of the hydraulic assembly are frequently sealed in a sophisticated manner at several locations. Further, the individual hollow chambers of the components are separately ventilated and bled for pressure balance. A large number of bleeding points automatically involves a large number of possible trouble sources which may cause malfunctions. Salt or water is likely to accumulate in the valve chamber, pump space, engine compartment and pressure accumulator chamber and possibly causes flooding of the hollow chambers.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a hydraulic assembly which is protected against corrosion and minimizes cost and weight. The assembly should permit ventilation and bleeding irrespective of where the entire assembly is positioned, avoiding the application of fluid and differential pressure to the individual hollow chambers.
According to the present invention, this object is achieved by connecting a plurality of hollow chambers associated with functional elements to one joint ventilation system which permits ventilation and bleeding of the hollow chambers for pressure balance in relation to the atmosphere exclusively by way of a point of ventilation which is connected to at least one pressure compensation channel of the ventilation system.
If the pressure compensation channel which is connected to the hollow chamber of the accumulator element terminates directly into a hollow chamber within a cover unit which accommodates the valve elements, and if another pressure compensation channel associated with the drive element and a pressure generation element terminates into the mentioned hollow chamber, and if the point of ventilation is included in the wall of the cover unit, especially simple provisions in terms of manufacture are achieved for making the two necessary pressure compensation channels in the accommodating member. The point of ventilation can be positioned relatively easily in a cover unit which is mainly made of plastics.
A particularly reliable, light-weight and low-cost solution to the problem at issue is attained if the point of ventilation has a gas-permeable wall portion, which is impermeable to fluids and solid particles, however.
A breathing diaphragm is appropriate for the point of ventilation.
According to an alternative, constructive extension, the point of ventilation includes a non-return valve which seals the hollow chambers against the ingress of moisture.
If required, a hose is appropriately used for the reliable ventilation and bleeding of the hydraulic assembly. The hose is connected to the point of ventilation and can be conducted to a moisture-protected area.
A defined connection of the hollow chamber, remote from the working chamber, may be included in the joint ventilation system to the atmosphere. A pressure compensation channel extend
REFERENCES:
patent: 4241642 (1980-12-01), Peeples
patent: 4828335 (1989-05-01), Fuller et al.
patent: 5466055 (1995-11-01), Schmitt et al.
patent: 5634695 (1997-06-01), Ohta et al.
Dinkel Dieter
Reinartz Hans-Dieter
Volz Peter
Graham Matthew C.
ITT Manufacturing Enterprises Inc.
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