Fuel injection apparatus

• US 8,444,069 B2
• Filed: 04/01/2010
• Issued: 05/21/2013
• Est. Priority Date: 04/03/2009
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Fujino, Tomoki, Kondo, Jun, Kagami, Shu, Miyamoto, Yutaka
• Primary Examiner(s): Tran, Len
• Assistant Examiner(s): Le, Viet
• Application Number:
  US12/752,499
• Publication Number:
  US 20100252659A1
• Time in Patent Office: 1,146 Days
• Field of Search: 239/585.1, 239/900, 251/129.09, 137/557, 731/144.3, 731/144.5, 731/145.3, 123/387
• US Class Current: 239/585.1
• CPC Class Codes: F02M 2200/24 Fuel-injection apparatus with sensors
• CPC Class Codes: F02M 2200/9015 Elastomeric or plastic materials
• CPC Class Codes: F02M 47/027 Electrically actuated valves draining the chamber to release the closing pressure
• CPC Class Codes: F02M 51/005 Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus

Abstract

A fuel injection apparatus includes a body, a nozzle, a pressure control unit, a physical quantity measurement unit, a first terminal, a second terminal, a positioning member, and a resin connector main body portion. The pressure control unit controls opening and closing of the nozzle The physical quantity measurement unit outputs an electric signal in accordance with a physical quantity of high pressure fuel. The first terminal is connected to the pressure control unit. The second terminal connected to the physical quantity measurement unit. The positioning member integrally holds the first terminal and the second terminal and locates the first terminal and the second terminal at predetermined positions. The connector main body portion receives therein the positioning member.

Claims

1. A fuel injection apparatus comprising:

a body having a high-pressure fuel passage that allows high pressure fuel to flow therethrough;

a nozzle having an injection orifice that allows high pressure fuel to be injected therethrough when the nozzle is opened;

a pressure control unit that controls opening and closing of the nozzle by controlling pressure applied to a nozzle needle of the nozzle in accordance with an electric signal received from an exterior;

a physical quantity measurement unit that outputs an electric signal in accordance with a physical quantity of high pressure fuel;

a first terminal connected to the pressure control unit;

a second terminal connected to the physical quantity measurement unit;

a positioning member that integrally holds the first terminal and the second terminal and locates the first terminal and the second terminal at predetermined spaced apart positions; and

a connector main body portion that receives therein the positioning member, the connector main body portion being made of a resin, wherein;

the positioning member is a separate component from the connector main body portion that is received in the connector main body portion.

2. The fuel injection apparatus according to claim 1, wherein:

the first terminal has a first part connected to a first terminal of an external connector and has a second part connected to the pressure control unit, the first part of the first terminal having a thickness greater than a thickness of the second part of the first terminal; and

the second terminal has a first part connected to a second terminal of the external connector and has a second part connected to the physical quantity measurement unit, the first part of the second terminal having a thickness greater than a thickness of the second part of the second terminal.

3. The fuel injection apparatus according to claim 1, further comprising:

a cover member that covers an end portion of the body remote from the nozzle, the cover member having a projection portion, wherein;

the positioning member is a flat plate; and

the positioning member has a positioning bore that is fitted with the projection portion of the cover member.

4. The fuel injection apparatus according to claim 1, wherein:

the second part of the first terminal is curved to be connected to the pressure control unit; and

the second part of the second terminal is curved to be connected to the physical quantity measurement unit.

5. The fuel injection apparatus according to claim 1, wherein:

the first terminal is one of a plurality of first terminals that are positioned on a first plane;

the second terminal is one of a plurality of second terminals that are positioned on a second plane;

the first plane is spaced away from the second plane by a predetermined distance therebetween; and

the first plane is in parallel with the second plane.

6. The fuel injection apparatus according to claim 1, wherein:

the positioning member is mounted to the body in a state where the first terminal and the second terminal are fixed to the positioning member.

7. The fuel injection apparatus according to claim 6, wherein:

the positioning member, integrally holding the first terminal and the second terminal, is indirectly mounted to the body.

8. The fuel injection apparatus according to claim 1, wherein:

the positioning member is encapsulated by the resin of the connector main body portion.

9. The fuel injection apparatus according to claim 1, further comprising:

a cover member that covers an end portion of the body remote from the nozzle, wherein;

the positioning member is fixed to the cover member in a state where the first terminal and the second terminal are fixed to the positioning member.

10. The fuel injection apparatus according to claim 9, wherein:

the physical quantity measurement unit, the cover member, and the positioning member are insert-molded into the connector main body portion.

11. A fuel injection apparatus comprising:

a body having a fuel passage that allows fuel to flow therethrough;

a nozzle having an injection orifice that allows fuel to be injected therethrough when opened;

a pressure control unit that controls opening and closing of the nozzle by controlling pressure applied to a nozzle needle of the nozzle in accordance with an external electric signal;

a physical quantity measurement unit that outputs a detection signal in accordance with a physical quantity of fuel;

a first terminal connected to the pressure control unit to conduct the external electric signal;

a second terminal connected to the physical quantity measurement unit to conduct the detection signal;

a positioning member that is mounted to the body; and

a connector main body portion that is molded from resin, wherein;

the positioning member is a separate component from the connector main body portion, and

the positioning member is insert-molded into the connector main body portion in a state where the first terminal and the second terminal are fixed to the positioning member to locate the first terminal and the second terminal at predetermined positions.

12. The fuel injection apparatus according to claim 11, further comprising:

a cover member that is located between the body and the positioning member, the cover member covering an end portion of the body remote from the nozzle.