Pressure regulator for a fuel system

Fluid handling – With repair – tapping – assembly – or disassembly means – Assembling – disassembling – or removing cartridge type valve

Patent

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Details

123457, 137510, F02M 3710, F02M 6954

Patent

active

060168315

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a pressure regulator for a fuel systems.
There is a large number of publications that disclose a pressure regulator whose housing is comprised of two housing parts connected by means of a crimped edge, wherein a membrane unit that divides two chambers from each other in the housing is also clamped at the crimped edge. The German published patent application 23 54 461 will be used as a representative for the many publications.
Because there is fuel in the housing, it is very important that the connection that clamps the two housing parts together and secures the membrane unit is sealed, particularly if the device is disposed outside a fuel tank, for example in the vicinity of a hot internal combustion engine.
Because leaks can occur even with carefully created crimped edges, e.g. after damage due to shocks to the housing, it has already been proposed that the two housing parts be welded together over their entire circumference. This process, however, is very costly and despite cooling measures, the membrane unit cannot be prevented from being damaged by heat generated during the welding process.
For the crimping of the two housing parts, high forces must be used for shaping the edges of the housing parts. In particular, attention must be paid that during crimping, the regions of the housing disposed outside the crimp are not unduly deformed. Since high forces are required for the crimping, the fact that the housing is not unduly deformed during the crimping must be assured with costly measures, in particular by means of careful securing of the housing parts in special machines. It is therefore also not advisable to entirely or partially cast or mold the housing in plastic because then the forces acting on the housing during the crimping can no longer be reliably intercepted.
An extremely high degree of care must be exercised when crimping the housing parts. In particular, the limits of the permissible tolerances of the material used for the housing parts, the material used for the membrane, the dimensions of the housing parts, the dimensions of the membrane, the forces exerted during the crimping, the die forms used for the crimping, to name only a few examples, must be very narrowly set, which leads to high costs for the manufacture. Even the slightest overstepping of the narrow tolerance limits can lead to a malfunction, in particular to a leak. Also, sags that appear during the use of the device can lead to a malfunction, in particular to a leak. Because an inadequate crimping of the housing parts sometimes only leads to a leak after a long service life of the device, there is a great danger that occasionally, a large number of inadequately crimped housings reaches the customer before the defect is detected. Also, sags that appear between the housing parts to be crimped and the membrane unit during the operation of the device can occasionally lead to leaks even if in a first testing of the crimp, it appeared as though the crimp was in order.


ADVANTAGES OF THE INVENTION

The device for a fuel system, according to the invention has the advantage over the prior art that the housing parts can be assembled without a high cost and by using relatively low forces that are easy to produce.
Another advantage is that the limits of the tolerances in the materials of the housing parts and the membrane unit can be far apart from each other without having to fear that the device will be leaky.
Because the assembly of the housing parts can occur very simply, in particular without expensive devices and machines, the assembly of the device can advantageously be established at any desirable location on a production line.
Because only low forces are required to assemble the housing parts, it is possible to cast the housing of the device, for example in plastic, without having to fear that damage can occur when assembling the housing parts.
Also, deformations of the housing, which can occur, for example, when something strikes against the finished housing, advantageously hardly ever lea

REFERENCES:
patent: 5078167 (1992-01-01), Brandt et al.
patent: 5458104 (1995-10-01), Tuckey
patent: 5577478 (1996-11-01), Tuckey
patent: 5720263 (1998-02-01), Frank et al.

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