# US 2024/0392736 A1 · Injector for gaseous fuel

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- Number: US 2024/0392736 A1
- Document ID: US20240392736A1
- Status: Published application
- Kind: A1
- Application number: 18/697,105
- Filed: 2022-09-23
- Published: 2024-11-28
- Earliest claimed: 2021-09-30
- Assignees: BorgWarner Luxembourg Automotive Systems SA
- Applicants: Borgwarner Luxembourg Automotive Systems S.A.
- Inventors: Manfred KOLKMAN
- Web page: https://patentgrep.com/patent/US20240392736A1

## CPC

- F02M 21/0269: {Outwardly opening valves, e.g. poppet valves}
- F02M 61/08: the valves opening in direction of fuel flow {(F02M61/047 takes precedence)}
- F02M 21/0281: {Adapters, sockets or the like to mount injection valves onto engines; Fuel guiding passages between injectors and the air intake system or the combustion chamber}
- F02M 21/0206: {Non-hydrocarbon fuels, e.g. hydrogen, ammonia or carbon monoxide}
- F02M 21/0275: {for in-cylinder direct injection, e.g. injector combined with spark plug}
- F02M 2200/852: provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches
- F02M 2200/853: involving use of quick-acting mechanism, e.g. clips
- Y02T 10/30: Use of alternative fuels, e.g. biofuels
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A fuel injector suitable for gaseous fuels comprises an injection nozzle having a tip region that is shaped to define a valve seat that extends about a central outlet opening and an outward opening injection needle slidably received in the injection nozzle. A nozzle cap is received over the tip region of the injection nozzle, wherein the tip region and the nozzle cap are configured to define an thermal barrier layer between them to reduce thermal transfer. The nozzle cap is releasably clipped onto the tip region. It comprises a slot and is configured to be compressible in a radial direction so as to reduce its outer diameter.

## Claims

### Claim 1

A fuel injector suitable for gaseous fuels, comprising:
an injection nozzle having a tip region that is shaped to define a valve seat that extends about a central outlet opening; and
an outward opening injection needle slidably received in the injection nozzle;
wherein the injection nozzle further includes a nozzle cap that is received over the tip region of the injection nozzle, wherein the tip region and the nozzle cap are configured to define an thermal barrier layer between them to reduce thermal transfer;
wherein the nozzle cap and the tip region of the injection nozzle are configured so that the nozzle cap is releasably clipped onto the tip region;
wherein the nozzle cap is configured to be compressible in a radial direction so as to reduce its outer diameter; and
wherein the nozzle cap comprises a slot that extends from a first end to a second end.

### Claim 2 (depends on 1)

The fuel injector of claim 1, wherein the nozzle cap is received over a reduced-diameter portion of the tip region of the injection nozzle.

### Claim 3 (depends on 2)

The fuel injector of claim 2, wherein a radially outer surface of the nozzle cap has substantially the same cross section profile as an adjacent part of the tip region.

### Claim 4

The fuel injector of wherein the thermal barrier layer is defined by a radial clearance between an outer surface of the tip region of the nozzle and an inner surface of the nozzle cap.

### Claim 5 (depends on 1)

The fuel injector of claim 1, wherein the slot is linear.

### Claim 6 (depends on 1)

The fuel injector of claim 1, wherein the nozzle cap defines an internal circumferential lip that abuts a leading edge of the tip region of the injection nozzle.

### Claim 7 (depends on 1)

The fuel injector of claim 1, wherein the nozzle cap further defines a hood portion that extends beyond the tip region and provides a fuel delivery guide.

### Claim 8 (depends on 7)

The fuel injector of claim 7, wherein the hood portion defines at least one outlet opening.

### Claim 9 (depends on 8)

The fuel injector of claim 8, wherein the at least one outlet opening is offset from an injector centre axis.

### Claim 10 (depends on 1)

The fuel injector of claim 1, wherein the nozzle cap includes a rotational locking feature that is configured to engage with the injection nozzle.

### Claim 11 (depends on 1)

An injector arrangement including a fuel injector as claimed in claim 1, the nozzle of the fuel injector being at least partly received in a bore defined in a wall at least partly bounding a combustion chamber, wherein the injection nozzle and the nozzle cap are received in the bore such that the nozzle cap is in direct thermal contact with the bore to promote thermal transfer between the nozzle cap and the wall.