Injection nozzle, fuel injector having injection nozzle

Inventors: Michael Leukart (Dusslingen, DE); Ferdinand Nicolai (Stuttgart, DE)

Assignee: Robert Bosch GmbH

F02M61/12 F02M61/1886

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Quick Facts

Patent No.: US 12669102
App. No.: 18/551,669
Granted: Jun 30, 2026
Kind: B2

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Abstract

The invention relates to an injection nozzle ( 1 ) for injecting a fluid, in particular a liquid or gaseous fuel, comprising: a nozzle body ( 2 ) which is designed to be hollow-cylindrical at least in portions and forms a sealing seat ( 3 ) via which a flow path ( 4 ) for the fluid to be injected leads, a nozzle needle ( 5 ) which is accommodated in the nozzle body ( 2 ) for reciprocating movement and has a sealing surface ( 6 ) that interacts with the sealing seat ( 3 ), a guide element ( 7 ) which is fixedly connected to the nozzle needle ( 5 ) and is guided by means of an external guide ( 8 ) of the nozzle body ( 2 ). The invention further relates to a fuel injector having an injection nozzle ( 1 ) according to the invention.

Claims (23)

1 . An injection nozzle ( 1 ) for injecting a fluid, the injection nozzle comprising:

a nozzle body ( 2 ) which is configured to be hollow-cylindrical at least in portions and forms a sealing seat ( 3 ) via which a flow path ( 4 ) for the fluid to be injected leads,

a nozzle needle ( 5 ) which is accommodated in the nozzle body ( 2 ) for reciprocating movement and has a sealing surface ( 6 ) that interacts with the sealing seat ( 3 ),

wherein

the nozzle needle ( 5 ) is fixedly connected to a guide element ( 7 ), the guide element ( 7 ) is guided by an external guide ( 8 ) of the nozzle body ( 2 ) for movement relative to the nozzle body ( 2 ),

wherein the guide element ( 7 ) includes a wall that delimits a flow chamber ( 11 ) and the wall comprises at least one opening ( 12 ) for discharging the fluid from the flow chamber ( 11 ).

2 . The injection nozzle ( 1 ) according to claim 1 ,

wherein the external guide ( 8 ) and the flow path ( 4 ) are spatially separated by the nozzle body ( 2 ).

3 . The injection nozzle ( 1 ) according to claim 1 ,

wherein an outer peripheral area of the nozzle body ( 2 ) forms the external guide ( 8 ), and the guide element ( 7 ) surrounds the outer peripheral area of the nozzle body ( 2 ).

4 . The injection nozzle ( 1 ) according to claim 1 ,

wherein the guide element ( 7 ) comprises a central recess ( 9 ) in which an end portion ( 10 ) of the nozzle needle ( 5 ) is accommodated.

5 . The injection nozzle ( 1 ) according to claim 1 ,

wherein the sealing seat ( 3 ) and/or the sealing surface ( 6 ) that interacts with the sealing seat ( 3 ) is/are conically shaped.

6 . The injection nozzle ( 1 ) according to claim 1 ,

wherein the sealing surface ( 6 ) is formed on a portion ( 13 ) of the nozzle needle ( 5 ) that has an enlarged outer diameter.

7 . The injection nozzle ( 1 ) according to claim 1 ,

wherein the nozzle needle ( 5 ) opens outwards.

8 . The injection nozzle ( 1 ) according to claim 1 ,

wherein the nozzle needle ( 5 ) opens inwards.

9 . A fuel injector having an injection nozzle ( 1 ) according to claim 1 .

10 . The injection nozzle ( 1 ) according to claim 1 , wherein the fluid is a liquid or gaseous fuel.

11 . The injection nozzle ( 1 ) according to claim 4 , wherein the end portion ( 10 ) of the nozzle needle ( 5 ) is configured as a pin.