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US 10,208,726 B2Granted
Fuel injection device
AssigneeDenso Corporation
InventorsShinobu Oikawa, Eiji Mimura
Life of this patent
Estimating the term…
Abstract
An inside projection is formed in one piece with a second tubular member and projects in a tubular form toward a third tubular member, and an outside projection is formed in one piece with the third tubular member and projects in a tubular form toward the second tubular member, while an inner wall of the outside projection is engaged with an outer wall of the inside projection. Another inside projection is formed in one piece with the second tubular member and projects in a tubular form toward a first tubular member, and another outside projection is formed in one piece with the first tubular member and projects in a tubular form toward the second tubular member, while an inner wall of the outside projection is engaged with an outer wall of the inside projection.
Claims12
A fuel injection device comprising:
- a nozzle that includes:
- a nozzle tube portion that is shaped into a tubular form;
- a nozzle bottom portion that closes one end of the nozzle tube portion;
- an injection hole that connects between a surface of the nozzle bottom portion, which is located on the nozzle tube portion side, and an opposite surface of the nozzle bottom portion, which is opposite from the nozzle tube portion, wherein the injection hole injects fuel;
- and
- a valve seat that is formed into a ring form around the injection hole on the nozzle tube portion side of the nozzle bottom portion;
- a housing that includes:
- a first tubular member that is made of a magnetic metal material and is placed such that one end of the first tubular member-is connected to an opposite side of the nozzle tube portion, which is opposite from the nozzle bottom portion;
- a second tubular member that is made of a non-magnetic metal material is placed such that one end of the second tubular member is placed at a side where another end of the first tubular member is located;
- a third tubular member that is made of a magnetic metal material and is placed such that one end of the third tubular member is placed at a side where another end of the second tubular member is located;
- and
- a fuel passage that is formed in an inside of the first tubular member, the second tubular member and the third tubular member to conduct the fuel to the injection hole;
- a needle that is reciprocatable in an inside of the fuel passage, wherein when one end of the needle is lifted away from or is seated against the valve seat, the needle opens or closes the injection hole;
- an inside projection that is formed in one piece with one of the second tubular member and the third tubular member such that the inside projection projects in a tubular form from an end surface of the one of the second tubular member and the third tubular member toward another one of the second tubular member and the third tubular member and is connected to the another one of the second tubular member and the third tubular member;
- an outside projection that is formed in one piece with the another one of the second tubular member and the third tubular member such that the outside projection projects in a tubular form from an end surface of the another one of the second tubular member and the third tubular member toward the one of the second tubular member and the third tubular member and is connected to the one of the second tubular member and the third tubular member while an inner wall of the outside projection contacts an outer wall of the inside projection;
- an end surface of the outside projection contacts the end surface of the one of the second tubular member and the third tubular member;
- an end surface of the inside projection and the end surface of the outside projection are displaced from each other in an axial direction;
- the end surface of the outside projection is welded to the end surface of the one of the second tubular member and the third tubular member to form a welded portion;
- and
- a length of the welded portion, which joins between the end surface of the outside projection and the end surface of the one of the second tubular member and the third tubular member, is at least equal to a length of the end surface of the outside projection.
17 more elements
A fuel injection device comprising:
- a nozzle that includes:
- a nozzle tube portion that is shaped into a tubular form;
- a nozzle bottom portion that closes one end of the nozzle tube portion;
- an injection hole that connects between a surface of the nozzle bottom portion, which is located on the nozzle tube portion side, and an opposite surface of the nozzle bottom portion, which is opposite from the nozzle tube portion, wherein the injection hole injects fuel;
- and
- a valve seat that is formed into a ring form around the injection hole on the nozzle tube portion side of the nozzle bottom portion;
- a housing that includes:
- a first tubular member that is made of a magnetic metal material and is placed such that one end of the first tubular member-is connected to an opposite side of the nozzle tube portion, which is opposite from the nozzle bottom portion;
- a second tubular member that is made of a non-magnetic metal material and is placed such that one end of the second tubular member is placed at a side where another end of the first tubular member is located;
- a third tubular member that is made of a magnetic metal material and is placed such that one end of the third tubular member is placed at a side where another end of the second tubular member is located;
- and
- a fuel passage that is formed in an inside of the first tubular member, the second tubular member and the third tubular member to conduct the fuel to the injection hole;
- a needle that is reciprocatable in an inside of the fuel passage, wherein when one end of the needle is lifted away from or is seated against the valve seat, the needle opens or closes the injection hole;
- an inside projection that is formed in one piece with one of the first tubular member and the second tubular member such that the inside projection projects in a tubular form from an end surface of the one of the first tubular member and the second tubular member toward another one of the first tubular member and the second tubular member and is connected to the another one of the first tubular member and the second tubular member;
- an outside projection that is formed in one piece with the another one of the first tubular member and the second tubular member such that the outside projection projects in a tubular form from an end surface of the another one of the first tubular member and the second tubular member toward the one of the first tubular member and the second tubular member and is connected to the one of the first tubular member and the second tubular member while an inner wall of the outside projection contacts an outer wall of the inside projection;
- an end surface of the outside projection contacts the end surface of the one of the first tubular member and the second tubular member;
- an end surface of the inside projection and the end surface of the outside projection are displaced from each other in an axial direction;
- the end surface of the outside projection is welded to the end surface of the one of the first tubular member and the second tubular member to form a welded portion;
- and
- a length of the welded portion, which joins between the end surface of the outside projection and the end surface of the one of the first tubular member and the second tubular member, is at least equal to a length of the end surface of the outside projection.
17 more elements
Dependencies are inferred from the claim text.