Fuel injection device

Patent metadata

Field	Value
Publication number	US-11230999-B2
Application number	US-202016902597-A
Country	US
Kind code	B2
Filing date	Jun 16, 2020
Priority date	Jun 19, 2019
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

An injector includes a nozzle portion to inject fluid, a coil to generate a driving force to open and close the nozzle portion, and a molded resin that seals the coil. A cooling jacket has a flow path to cause cooling fluid to flow therethrough. The cooling jacket houses the injector and has an opening in an end opposite to the nozzle portion. A sealing material is filled in a space between the cooling jacket and the molded resin.

First claim

What is claimed is:

1. A fluid injection device comprising:
an injector that includes:
a nozzle portion configured to inject fluid;
a coil configured to generate a driving force to drive the nozzle portion to open and close the nozzle portion; and
a molded resin that seals the coil;

a cooling jacket that has a flow path configured to cause cooling fluid to flow therethrough, that houses the injector, and that has an opening in an end opposite to the nozzle portion; and
a sealing material that is filled in a space between the cooling jacket and the molded resin, wherein
the sealing material covers an end of the molded resin opposite to the nozzle portion, and
the sealing material is exposed to the opening.

2. The fluid injection device according to claim 1 , wherein
the space between the cooling jacket and the molded resin, and in which the sealing material is filled, includes an enlarged portion partially in the circumferential direction, and
a distance between the cooling jacket and the molded resin is larger in the enlarged portion than in an other portion that is other than the enlarged portion.

3. The fluid injection device according to claim 2 , further comprising:
a harness that is electrically connected to the coil, wherein
the enlarged portion is formed outside an angular range of 25° about a center axis of the injector in a circumferential direction, and
the harness resides in the angular range.

4. A fluid injection device comprising:
an injector that includes:
a nozzle portion configured to inject fluid;
a coil configured to generate a driving force to drive the nozzle portion to open and close the nozzle portion; and
a molded resin that seals the coil;
a cooling jacket that has a flow path configured to cause cooling fluid to flow therethrough, that houses the injector, and that has an opening in an end opposite to the nozzle portion; and
a sealing material that is filled in a space between the cooling jacket and the molded resin, wherein
the sealing material is formed of a resin material that is mixed with a material higher in thermal conductivity than the resin material.

5. The fluid injection device according to claim 1 , wherein
the sealing material is formed of a resin material, and
the resin material has a thermosetting property and flexibility.

6. The fluid injection device according to claim 1 , wherein
the molded resin has a through hole that extends through the molded resin in an axial direction.

7. The fluid injection device according to claim 1 , wherein
the cooling jacket has a communication flow path at a position corresponding to a bottom of the space between the cooling jacket and the molded resin, and
the communication flow path communicates a radially inside of the cooling jacket with a radially outside of the cooling jacket.

8. The fluid injection device according to claim 1 , further comprising:
an inner jacket that accommodates the injector, wherein
the cooling jacket and the inner jacket therebetween form a flow path to cause cooling fluid to flow therethrough.

9. A fluid injection device comprising:
an injector that includes:
a nozzle portion configured to inject fluid;
a coil configured to generate a driving force to drive the nozzle portion to open and close the nozzle portion; and
a molded resin that seals the coil;

a cooling jacket that has a flow path configured to cause cooling fluid to flow therethrough, that houses the injector, and that has an opening in an end opposite to the nozzle portion; and
a sealing material that is filled in a space between the cooling jacket and the molded resin, wherein
the sealing material is formed of a resin material, and
the resin material has a thermosetting property and flexibility.

Assignees

• Denso Corp

Inventors

• Itami Shoichi

Classifications

• F02M53/043 Primary

  with cooling means other than air cooling · CPC title

• F02M51/061

  using electromagnetic operating means · CPC title

• F01N2610/1453

  Sprayers or atomisers; Arrangement thereof in the exhaust apparatus · CPC title

• F02M61/166

  Selection of particular materials · CPC title

• F02M2200/16

  Sealing of fuel injection apparatus not otherwise provided for · CPC title