Fuel injection valve with integrated spark plug

• US 6,340,015 B1
• Filed: 05/25/2000
• Issued: 01/22/2002
• Est. Priority Date: 06/27/1998
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Rieger, Franz, Norgauer, Rainer, Benedikt, Walter
• Primary Examiner(s): Kwon, John
• Assistant Examiner(s): Vo, Hieu T.
• Application Number:
  US09/486,528
• Time in Patent Office: 607 Days
• Field of Search: 123/297, 123/169.E, 123/169.P, 123/169.V, 313/120, 239/88
• US Class Current: 123/297
• CPC Class Codes: F02M 57/06 the devices being sparking plugs
• CPC Class Codes: F02M 61/166 Selection of particular materials

Abstract

A fuel injection valve (1) having an integrated sparkplug for direct injection of fuel into the combustion chamber of an internal combustion engine and for igniting the fuel injected into the combustion chamber has a valve body (7) which, together with a valve closing body (10) operated by a valve needle (9), forms a seal seat. The valve body (7) and to some extent the valve needle (9) are surrounded radially by an insulating body (6). The insulating body (6) is in turn surrounded radially at least in part by a housing body (2). Ignition electrodes (15, 16) are provided on the valve body (7) and the housing body (2). The valve needle (9) has a first metal guide section (9a) guided in a swirl insert (14), a second metal guide section (9b) guided in the insulating body (6) and an insulating section (9c) arranged between the guide sections (9a, 9b). The guide sections (9a, 9b) are connected in a positive manner to the insulating section (9c).

Claims

1. A fuel injection valve associated with an integrated sparkplug for achieving a direct injection of a fuel into a combustion chamber of an internal combustion engine and for igniting the fuel injected into the combustion chamber, comprising:

a valve body;

a valve needle;

a valve closing body operated by the valve needle and for forming a seal seat with the valve body;

an insulating body radially surrounding the valve body and at least partially surrounding the valve needle, wherein the valve needle includes;

a first metal guide section guided in the valve body,

a second metal guide section guided in the insulating body, and

an insulating section arranged between the first metal guide section and the second metal guide section, the first metal guide section and the second metal guide section being connected in a positive manner to the insulating section;

a housing body radially surrounding the insulating body at least in part; and

at least one ignition electrode provided on at least one of the valve body and the housing body.

2. The fuel injection valve of claim 1, wherein the insulating section of the valve needle is formed by a ceramic sleeve body.

3. The fuel injection valve of claim 2, wherein the connection between the insulating section and the first metal guide section and the second metal guide section is formed by one of a frictional engagement operation, a gluing operation, and a shrink fitting operation.

4. The fuel injection valve of claim 1, wherein the first metal guide section and the second metal guide section each includes a respective connecting pin inserted into a recess in the insulating section.

5. The fuel injection valve of claim 1, wherein:

the insulating section includes a connecting pin, and

the connecting pin is inserted into a recess of the second metal guide section.

6. The fuel injection valve of claim 1, wherein:

the insulating body includes a recess at a side through which a high-voltage cable is guided to the valve body and is electrically connected thereto, and

the recess is filled with a casting compound that provides an electrical insulation.

7. The fuel injection valve of claim 6, further comprising:

an electric burn-off resistor cast in the casting compound and integrated with the high-voltage cable.

8. The fuel injection valve of claim 6, wherein:

the high-voltage cable is connected, by one of a solder connection and a weld connection, to one of the valve body and a contact clip clamping the valve body, and

the one of the solder connection and the weld connection is covered by an insulating film having a high-voltage strength and being integrally cast in the casting compound.

9. The fuel injection valve of claim 1, wherein the valve body includes two valve body parts that are joined together by a weld.

10. A fuel injection valve associated with an integrated sparkplug for achieving a direct injection of a fuel into a combustion chamber of an internal combustion engine and for igniting the fuel injected into the combustion chamber, comprising:

a valve body;

a valve needle;

a valve closing body operated by the valve needle and for forming a seal seat with the valve body, wherein the valve needle and the valve closing body are formed from a one-piece ceramic part;

an insulating body radially surrounding the valve body and at least partially surrounding the valve needle;

a housing body radially surrounding the insulating body at least in part; and

at least one ignition electrode provided on at least one of the valve body and the housing body.

11. The fuel injection valve of claim 10, further comprising:

a first guide section arranged inside the valve body; and

a second guide section arranged inside the insulating body, wherein the one-piece ceramic part is guided on the first guide section and on the second guide section.

12. The fuel injection valve of claim 10, wherein a shape of the valve closing body is one of spherical and partially spherical.

13. The fuel injection valve of claim 10, wherein:

the insulating body includes a recess at a side through which a high-voltage cable is guided to the valve body and is electrically connected thereto, and

the recess is filled with a casting compound that provides an electrical insulation.

14. The fuel injection valve of claim 13, further comprising:

an electric burn-off resistor cast in the casting compound and integrated with the high-voltage cable.

15. The fuel injection valve of claim 13, wherein:

the high-voltage cable is connected, by one of a solder connection and a weld connection, to one of the valve body and a contact clip clamping the valve body, and

the one of the solder connection and the weld connection is covered by an insulating film having a high-voltage strength and being integrally cast in the casting compound.

16. The fuel injection valve of claim 10, wherein the valve body includes two valve body parts that are joined together by a weld.