Pipes and tubular conduits – With pressure compensators
Patent
1991-01-28
1992-12-22
Bryant, III, James E.
Pipes and tubular conduits
With pressure compensators
181255, 417540, F16L 5504
Patent
active
051727293
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention refers to an expansion hose for the reduction of pressure pulsations in hydraulic systems.
Such expansion hoses are employed among others in power steering plants of automotive vehicles, in which the expansion hose reacts at varying operating pressures with a change of the volume of the hose by expansion and reduces therewith the pressure pulsations originating from the pump. This reduction of the pressure pulsations depends from the length, the cross-section and the volume expansion of the expansion hose. Because, however, it is not possible to arbitrarily select for instance in a vehicle the above mentioned values due to the limited space available for the mounting the desired reduction of the pressure pulsations is in many cases not sufficient.
2. Description of the Prior Art
In order to obtain better results it is already known to arrange in the outer expansion hose a further inner flexible hose which at the one end is connected to the inlet side end piece and ends freely with its other open end in the outer expansion hose. It is, furthermore, also known to forsee additionally a throttle member about at the center of the outer expansion hose and which divides the outer expansion hose into two hose chambers which communicate with each other through a throttle port whereby the inner hose comprises at the area of the first chamber located at the inlet side radial ports into the first hose chamber. The flow resistance in the inner hose shall, thereby, lead to a phase shift between the two hydraulic flows into the hose chambers at the inlet end and the outlet end wherewith a reduction of a pulsation and noise is obtained.
It has, however, now been found that this expenditure for a reaching the desired object is not at all necessary. Furthermore, there can be a problem at the known expansion hose in that the inner hose ends freely in the outer hose because it depends here from the material selected for the inner hose; if not a uncontrollable position of the two hoses relative to each other leads to a damaging at the inner side of the outer hose by which finally a defect of the expansion hose results for which the reason is not immediately recognizable.
SUMMARY OF THE INVENTION
It is, therefore, a general object of the present invention to provide an expansion hose which regarding structural design and production is simple and has the desired properties and by which the danger of damage by the hoses coming into contact with each other does not exist.
A further object is to provide an expansion hose in which the inner flexible body extends freely up and into the outlet side end piece into its outlet channel and its outer diameter is less than the outlet channel surrounding same.
Yet a further object is to provide a flexible hose in which an inner flexible hollow body which can be a hose or a flexible tube is held in the outlet side end piece whereby such an amount of clearance is present that a reverse flow of the pressure medium through the annular gap into the space between the inner and the outer hose occurs.
Still a further object is to provide a flexible hose in which the pressure medium reaches the space between the inner and outer hose through radial portholes arranged distributed over the entire length of the inner flexible hollow body.
BRIEF DESCRIPTION OF THE DRAWING
The invention will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawing wherein:
the single figure illustrates a longitudinal section through an expansion hose.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
An outer pressure hose having a high lateral volume expansion 2 is connected to an inlet side end piece 1 which is rigidly connected at its other end to an outlet side end piece 3. The inlet side end piece 1 includes furthermore a nipple plug 4, to which an inner flexible hollow body 5 is conn
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Brown Laurence R.
Bryant III James E.
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