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Alternative joint for a high pressure sealing

IP.com Disclosure Number: IPCOM000028693D
Original Publication Date: 2004-Jun-25
Included in the Prior Art Database: 2004-Jun-25
Document File: 1 page(s) / 215K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Actual sealing of high pressure joints on gasoline injectors are made up of an ogive shaped head of softer material, pressed against the seat by means of a nut with a thread. The ā€˛female" nut is usually on the tube's side, while the injector top has an external thread. In some cases, this can lead to a non perfect alignment of the parts or a difficult assembly. An alternative solution for metal to metal sealing of high pressure joints is the use of brake-type tubes with an external thread on the tube's side and an internal one on the fitting side (see fig. 1). This can provide a more stable tightening of the assembly. In addition to that, brake tubes are less expensive than the other solution.

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Alternative joint for a high pressure sealing

Idea: Massimo Latini, IT-Pisa; Raffaele Russo, IT-Pisa; Domenico Viggiani, IT-Pisa

Actual sealing of high pressure joints on gasoline injectors are made up of an ogive shaped head of softer material, pressed against the seat by means of a nut with a thread. The "female" nut is usually on the tube's side, while the injector top has an external thread. In some cases, this can lead to a non perfect alignment of the parts or a difficult assembly.

An alternative solution for metal to metal sealing of high pressure joints is the use of brake-type tubes with an external thread on the tube's side and an internal one on the fitting side (see fig. 1). This can provide a more stable tightening of the assembly. In addition to that, brake tubes are less expensive than the other solution.

In figure 1 the injector group (1) is linked to the fuel tube (3) with a threaded joint (6). The tube (3) is fastened through an externally threaded fitting (5), which screws into the injector's side nut (4), making the tube (3) press itself against the injector's inlet (2).

Fig. 1

© SIEMENS AG 2004 file: 2004J06145.doc page: 1

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