Pressure pipe with formed connecting head

A pressure pipe and pressure technology, which is applied in the direction of pipes/pipe joints/pipe fittings, connections that use fluid pressure for packing seals, pipes, etc., can solve cumbersome problems, reduce the formation of upset forging wrinkles, and improve the use of strength.

Active Publication Date: 2010-06-16
MAN ENERGY SOLUTIONS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this prior art is the use of cumbersome stepped lugs and the inability to avoid deformation of the inner diameter by cold working with the method chosen in the prior art

Method used

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  • Pressure pipe with formed connecting head
  • Pressure pipe with formed connecting head
  • Pressure pipe with formed connecting head

Examples

Experimental program
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Effect test

Embodiment Construction

[0028] figure 2The pipe end of the fuel injection pipe with connection 1 and pipe 16 is shown. The beveled pressure shoulder 10 bears on a pressure ring 11 which is required for tightening, for example using a union nut (not shown). The envelope surface of the frusto-conical joint has both a concave arc 12 and a sealing surface 13 . The sealing surface 13 serves to seal the pressure pipe against a counterpart from the injection system (not shown). An inner cone 9 is formed in the region of the joint on the inner surface 17 of the pressure tube. The inner cone 9 forms a tube opening 19 on the top surface 18 . The pressure shoulder 10 forms an angle of greater than 90° with the outer surface of the pressure tube 16 . This angle is preferably between 100° and 110°. The loading of the pressure ring 11 is favorable in this angular range. The height H of the joint also has an effect on the formation of upset folds and should lie in the range of 0.5 to 1.0 times the outer diam...

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Abstract

The fuel injection pipe (16) for IC engines has a frustro-conical connecting section (1) at one end. This has an annular shoulder (10) on the side further from the outlet (19), on to which a thrust collar (11) fits. The shoulder is at an angle of more than 90 degree to the pipe. An independent claim is included for a die for forging the pipe.

Description

technical field [0001] The invention relates to a pressure pipe with a formed joint, and in particular a high-pressure fuel injection pipe with an upset joint. Background technique [0002] The pressure line, which is the object of the invention, is used as a fuel injection line for conveying fuel on an injection system or as a hydraulic line. In order to be able to tightly connect the pressure tube to other components, the end of the pressure tube is made frusto-conical. Cold working is used in the prior art as an economical variant for producing such joints. The results of the methods known from the prior art are shown, for example, in the publications US 6,286,556 B1 and DE 103 58 373 A1 by means of fuel pipes. [0003] This prior art is also figure 1 Shown in , the frusto-conical joint and the pipe interior deformed by pressure pipe upset are shown in cross-section. In this embodiment of the prior art, the sealing of the part to which the pressure tube is to be conne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L19/028F02M55/02B21J13/02
CPCB21K21/12F02M55/005F16L9/00F16L17/00
Inventor L·普罗尔W·罗迪格W·瓦格纳J·温特H·亚尔辛
Owner MAN ENERGY SOLUTIONS SA
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