Heat transferring fuel injector combustion seal with load bearing capability

Patent metadata

Field	Value
Publication number	US-2016138540-A1
Application number	US-201615006056-A
Country	US
Kind code	A1
Filing date	Jan 25, 2016
Priority date	Aug 8, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

The present disclosure provides a fuel injector seal assembly comprising a seal member comprising a first section, a second section and an annular recess disposed in the first section, the first section having a first diameter and the second section having a second diameter wherein the first diameter is greater than the second diameter; and a sleeve member comprising a first end received by the first section of the seal member, the sleeve member further including a lengthwise portion configured to press fit around a nozzle housing of a fuel injector to cause heat transfer from the nozzle housing toward a body portion of the fuel injector.

First claim

I/We claim:

1 . A fuel injector seal assembly, comprising:
a seal member comprising a first section, a second section and an annular recess disposed in the first section, the first section having a first diameter and the second section having a second diameter wherein the first diameter is greater than the second diameter; and a sleeve member comprising a first end received by the first section of the seal member, the sleeve member further including a lengthwise portion configured to press fit around a nozzle housing of a fuel injector to cause heat transfer from the nozzle housing toward a body portion of the fuel injector.

2 . The fuel injector seal assembly of claim 1 , further comprising a ring seal disposed in the annular recess, the ring seal structured to at least one of seal combustion gases from moving toward the body portion of the fuel injector and secure the seal member to the fuel injector.

3 . The fuel injector seal assembly of claim 1 , wherein the sleeve member further comprises a second end and an inner surface dimensioned to exert a radial force inwardly on the nozzle housing along the lengthwise portion extending between the first end and the second end.

4 . The fuel injector seal assembly of claim 1 , wherein the seal member is formed from a first material and the sleeve member is formed from a second material that is different from the first material.

5 . The fuel injector seal assembly of claim 4 , wherein the first material is a stainless steel material and wherein the second material is a copper material.

6 . The fuel injector seal assembly of claim 5 , wherein the stainless steel material is SAE 303 and wherein the copper material is one of the group consisting of UNS C15100 and UNS C15000, including an H01 temper.

7 . An internal combustion engine, comprising:
a mounting bore comprising a sealing surface; a fuel injector positioned in the mounting bore, the fuel injector comprising an injector body and a nozzle housing; and an injector seal assembly comprising a seal member and a sleeve member; wherein the sleeve member is press fit around the nozzle housing at an inner surface having a lengthwise portion that abuts the nozzle housing and the seal member is sealingly positioned around the sleeve member adjacent the injector body.

8 . The internal combustion engine of claim 7 , further comprising a ring seal disposed between the seal member and the sleeve member, the ring seal structured to at least one of seal combustion gases from moving toward the injector body of the fuel injector and secure the seal member to the fuel injector.

9 . The internal combustion engine of claim 7 , wherein the seal member further comprises a first section and a second section, the first section having a first diameter and the second section having a second diameter that is less than the first diameter.

10 . The internal combustion engine of claim 7 , wherein the mounting bore comprises a longitudinal axis and the sealing surface is formed at a first angle relative to the longitudinal axis.

11 . The internal combustion engine of claim 10 , wherein the seal member is positioned longitudinally between the injector body and the sealing surface to create a fluid seal between the seal member and the mounting bore.

12 . The internal combustion engine of claim 10 , wherein the seal member further comprises an outer angled surface configured such that a clamp load that holds the fuel injector in the mounting bore transfers load through a load path that includes an annular line of contact between the sealing surface and the outer angled surface to form a fluid seal between the seal member and the mounting bore.

13 . The internal combustion engine of claim 7 , wherein the sleeve member further comprises a first end and a second end, the sleeve member inner surface being structured to exert a radial force inwardly on the nozzle housing along the lengthwise portion that extends between the first end and the second end.

14 . The fuel injector seal assembly of claim 7 , wherein the seal member is formed from a first material and the sleeve member is formed from a second material that is different from the first material.

15 . An internal combustion engine, comprising:
a mounting bore comprising a sealing surface; a fuel injector positioned in the mounting bore, the fuel injector comprising an injector body and a nozzle housing; and an injector seal assembly including a seal member comprising an annular recess, a sleeve member and a ring seal disposed in the annular recess, the seal member being sealingly positioned adjacent the injector body and around the sleeve member, and the ring seal being structured to at least one of seal combustion gases from moving toward the injector body of the fuel injector and secure the seal member to the fuel injector; wherein the sleeve member comprises a first end that is received by the seal member and contacts the ring seal and, wherein the sleeve member comprises a lengthwise portion having an inner surface that is press fit around the nozzle housing.

16 . The internal combustion engine of claim 15 , wherein the seal member further comprises a first section having a first diameter and a second section having a second diameter, wherein the first diameter is greater than the second diameter and wherein the annular recess is disposed in the first section.

17 . The internal combustion engine of claim 15 , wherein the sleeve member further comprises a second end and the sleeve member inner surface is structured to exert a radial force inwardly on the nozzle housing along the lengthwise portion that extends between the first end and the second end.

18 . The internal combustion engine of claim 15 , wherein the mounting bore further comprises a longitudinal axis and the sealing surface is formed at a first angle relative to the longitudinal axis.

19 . The internal combustion engine of claim 18 , wherein the seal member is positioned longitudinally between the injector body and the sealing surface to create a fluid seal between the seal member and the mounting bore.

20 . The internal combustion engine of claim 15 , wherein the seal member further comprises an outer angled surface such that a clamp load that holds the fuel injector in the mounting bore transfers load through a load path that includes an annular line of contact between the sealing surface and the outer angled surface to form a fluid seal between the seal member and the mounting bore.

Assignees

• Cummins Inc

Inventors

• Franks Gregory S
• Knight Joshua G
• Worthington Joseph A
• Rasener Fred M
• Stacy L Eric
• Small Hanna Christine
• Yeole Rajesh
• Monahan Timothy John

Classifications

• F02M2200/858

  sealing arrangements between injector and engine · CPC title

• F02M53/043 Primary

  with cooling means other than air cooling · CPC title

• F16J15/064

  the packing combining the sealing function with other functions · CPC title

• F02M61/14

  Arrangements of injectors with respect to engines; Mounting of injectors · CPC title

• F02M61/16

  Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14 · CPC title