Fuel injector for use in an engine

Claim 2

A fuel injector comprising: a housing body; a fuel supply bore for injecting fuel into an interior of said housing body; a nozzle opening arranged on a common axis with said fuel supply bore and always open to an exterior of said housing body to inject both fuel and air into the exterior of said housing body; an air passage filled with an air having a pressure higher than a pressure in the exterior of said housing body; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air; a fuel air passage formed in said housing body and extending between said joining portion and said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage extending obliquely relative to an axis of said nozzle opening and comprising a pair of fuel air passages, with corresponding joining portions, symmetrically arranged with respect to said common fix and joined in said nozzle opening, the fuel injected from said fuel supply bore being fed into both said fuel air passages at said corresponding joining portions; and an impingement wall formed by an inner circumferential wall of said nozzle opening, said fuel air passage extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall.

Claim 3

A fuel injector according to claim 1, wherein said air passage comprises a pair of air passages connected to said corresponding fuel flow passages at said corresponding joining portions and aligned with said corresponding fuel flow passages.

Claim 4

A fuel injector according to claim 1, wherein said fuel supply bore is open to a fuel flow passage formed on said common axis in said housing, and said fuel flow passage is divided into a pair of fuel flow passages separated by a separating wall and extending to said corresponding joining portions symmetrically with respect to said common axis.

Claim 5

A fuel injector according to claim 3, wherein said air passage comprises pair of air passages which are open to said corresponding joining portions toward an upper end portion of said separating wall.

Claim 6

A fuel injector according to claim 4, wherein both said fuel flow passages are bent.

Claim 7

A fuel injector according to claim 3, wherein another fuel flow passage and another fuel flow passage are provided and extend in a plane including said common axis and perpendicular to a plane in which said pair of fuel flow passages are arranged.

Claim 8

A fuel injector according to claim 1, wherein said air passage is open to said joining portion over an entire periphery of said joining portion.

Claim 9

A fuel injector comprising: a housing body; a fuel supply bore for injecting fuel into an interior of said housing body, said fuel supply bore being open to a fuel flow passage formed in said housing body and divided into a pair of flow passages by a separating wall; a nozzle opening which is always open to an exterior of said housing body to inject both fuel and air into the exterior of said housing body; an air passage filled with an air having a pressure higher than a pressure in the exterior of said housing body, said air passage comprising a plurality of air passages; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air, said joining portion comprising a plurality of joining portions, one of said air passages being open to one of said flow passages at one of said joining portions toward an upper end portion of said separating wall; a fuel air passage formed in said housing body and extending between said joining portion nd said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage extending obliquely relative to an axis of said nozzle opening an d comprising a pair of fuel air passages, with corresponding joining portions, symmetrically arranged with respect to said common axis and joined in said nozzle opening, the fuel injected from said fuel supply bore being fed into both said fuel air passages at said corresponding joining portions; and an impingement wall formed by either one of said fuel air passages and said nozzle opening, said fuel air passages extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall.

Claim 10

A fuel injector comprising: a housing body; a fuel supply bore for injecting fuel into an interior of said housing body, said fuel supply bore being open to a fuel flow passage formed in said housing body and divided into a pair of flow passages by a separating wall; a nozzle opening which is always open to an exterior of said housing body to inject both fuel and air into the exterior of said housing body; an air passage filled with an air having a pressure higher than a pressure in the exterior of said housing body, said air passage comprising a plurality of air passages; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air, said joining portion comprising a plurality of joining portions, one of said air passages being open to one of said flow passages at one of said joining portions toward an upper end portion of said separating wall; a fuel air passage formed in said housing body and extending between said joining portion nd said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage extending obliquely relative to an axis of said nozzle opening an d comprising a pair of fuel air passages, with corresponding joining portions, symmetrically arranged with respect to said common axis and joined in said nozzle opening, the fuel injected from said fuel supply bore being fed into both said fuel air passages at said corresponding joining portions; and an impingement wall formed by either one of said fuel air passages and said nozzle opening, said fuel air passages extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall.

Claim 11

A fuel injector comprising: a housing body; a fuel supply bore for injecting fuel into an interior of said housing body; a nozzle opening arranged on a common axis with said fuel supply bore, always open to an exterior of said housing body to inject both fuel and air into the exterior of said housing body; an air passage filled with an air having a pressure higher than a pressure in the exterior of said housing body; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air; a fuel air passage formed in said housing body and extending between said joining portion and said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage comprising a pair of fuel air passages, with corresponding joining portions, symmetrically arranged with respect to said common axis and joined in said nozzle opening, said air passage comprising at least one pair of air passages which are tangentially connected to the inner peripheral walls of said corresponding fuel air passages at said joining portions to create whirl motions of the air in opposite directions in said fuel air passages; and an impingement wall formed by either one of said fuel air passages and said nozzle opening, said fuel air passages extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall.

Claim 12

A fuel injector comprising: a housing body; a fuel supply bore for injecting fuel into an interior of said housing body; a nozzle opening arranged on a common axis with said fuel supply bore, always open to an exterior of said housing body to inject both fuel and air into the exterior of said housing body; an air passage filled with an air having a pressure higher than a pressure in the exterior of said housing body; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air; a fuel air passage formed in said housing body and extending between said joining portion and said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage comprising a pair of fuel air passages, with corresponding joining portions, symmetrically arranged with respect to said common axis and joined in said nozzle opening, said air passage comprising at least one pair of air passages which are tangentially connected to the inner peripheral walls of said corresponding fuel air passages at said joining portions to create whirl motions of the air in opposite directions in said fuel air passages; and an impingement wall formed by either one of said fuel air passages and said nozzle opening, said fuel air passages extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall.

Claim 13

A fuel injector according to claim 1, wherein said air passages are symmetrically arranged with respect to a plane including said common axis and perpendicular to a plane in which the pair of said fuel air passages are arranged.

Claim 14

A fuel injector comprising: a housing body; a fuel supply bore for injecting fuel into an interior of said housing body; a nozzle opening which is always open to an exterior of said housing body to inject both fuel and air into the exterior of said housing body; an air passages filled with an air having a pressure higher than a pressure in the exterior of said housing body; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air; a fuel air passage formed in said housing body and extending between said joining portion and said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage being formed by a swirl chamber extending in an opposite direction from said joining portion and having opposed end portions, a bottom wall, and a rectangular cross-sectional shape, said nozzle opening comprising a pair of nozzle openings connected to the corresponding opposed end portions of said swirl chamber, said air passage being open to said whirl chamber at said joining portion toward said bottom wall to create a swirl motion of the air therein, the fuel being injected from said fuel supply bore toward an outer periphery of said swirl motion; and an impingement wall formed by said opposed end portions of said swirl chamber, said fuel air passage extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall.

Claim 15

A fuel injector comprising: a housing body; a fuel supply bore for injecting fuel into an interior of said housing body; a nozzle opening which is always open to an exterior of said housing body to inject both fuel and air into the exterior of said housing body; an air passages filled with an air having a pressure higher than a pressure in the exterior of said housing body; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air; a fuel air passage formed in said housing body and extending between said joining portion and said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage being formed by a swirl chamber extending in an opposite direction from said joining portion and having opposed end portions, a bottom wall, and a rectangular cross-sectional shape, said nozzle opening comprising a pair of nozzle openings connected to the corresponding opposed end portions of said swirl chamber, said air passage being open to said whirl chamber at said joining portion toward said bottom wall to create a swirl motion of the air therein, the fuel being injected from said fuel supply bore toward an outer periphery of said swirl motion; and an impingement wall formed by said opposed end portions of said swirl chamber, said fuel air passage extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall.

Claim 16

A fuel injector comprising: a housing body; a fuel supply bore for injecting fuel into an interior of said housing body; a nozzle opening which is always open to an exterior of said ad housing body to inject both fuel and air into the exterior of said housing body; an air passage filled with an air having a pressure higher than a pressure in the exterior of said housing body; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air; a fuel air passage formed in said housing body and extending between said joining portion and said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage being formed by a swirl chamber extending in an opposite direction from said joining portion and having opposed end portions, said nozzle opening comprising a pair of nozzle openings connected to the corresponding opposed end portions of said swirl chamber, said air passage being open to said swirl chamber at said joining portion to create a swirl motion of the air therein, the fuel being injected form said fuel supply bore toward an outer periphery of said swirl motion; an impingement wall formed by said opposed end portions of said swirl chamber, said fuel air passage extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall; and another air passage for feeding air into an upper interior of said swirl chamber to strengthen said swirl motion.

Claim 17

A fuel injector comprising: a housing body; a fuel supply bore for injecting fuel into an interior of said housing body; a nozzle opening which is always open to an exterior of said ad housing body to inject both fuel and air into the exterior of said housing body; an air passage filled with an air having a pressure higher than a pressure in the exterior of said housing body; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air; a fuel air passage formed in said housing body and extending between said joining portion and said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage being formed by a swirl chamber extending in an opposite direction from said joining portion and having opposed end portions, said nozzle opening comprising a pair of nozzle openings connected to the corresponding opposed end portions of said swirl chamber, said air passage being open to said swirl chamber at said joining portion to create a swirl motion of the air therein, the fuel being injected form said fuel supply bore toward an outer periphery of said swirl motion; an impingement wall formed by said opposed end portions of said swirl chamber, said fuel air passage extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall; and another air passage for feeding air into an upper interior of said swirl chamber to strengthen said swirl motion.

Claim 18

A fuel injector comprising: a housing body; `a fuel supply bore for injecting fuel into an interior of said housing body; a nozzle opening which is always open o an exterior of said housing body to inject both fuel and air into the exterior of said housing body; an air passage filled with an air having a pressure higher than a pressure in the exterior of said housing body; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air; a fuel air passage formed in said housing body and extending between said joining portion and said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage being formed by a swirl chamber extending in an opposite direction from said joining portion and having opposed end portions and a rough inner surface, said nozzle opening comprising a pair of nozzle openings connected to the corresponding opposed end portions of said swirl chamber, said air passage being open to said swirl chamber at said joining portion to create a swirl motion of the air therein, the fuel being injected from said fuel supply bore toward an outer periphery of said swirl motion; and an impingement wall formed by said opposed end portions of said swirl chamber, said fuel air passage extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall.

Claim 19

A fuel injector comprising: a housing body; `a fuel supply bore for injecting fuel into an interior of said housing body; a nozzle opening which is always open o an exterior of said housing body to inject both fuel and air into the exterior of said housing body; an air passage filled with an air having a pressure higher than a pressure in the exterior of said housing body; a joining portion formed in said housing body for joining the fuel injected from said fuel supply bore with the air fed from said air passage to cause the fuel to be carried by the air; a fuel air passage formed in said housing body and extending between said joining portion and said nozzle opening to cause both the air and the fuel carried by the air to move toward said nozzle opening, said fuel air passage being formed by a swirl chamber extending in an opposite direction from said joining portion and having opposed end portions and a rough inner surface, said nozzle opening comprising a pair of nozzle openings connected to the corresponding opposed end portions of said swirl chamber, said air passage being open to said swirl chamber at said joining portion to create a swirl motion of the air therein, the fuel being injected from said fuel supply bore toward an outer periphery of said swirl motion; and an impingement wall formed by said opposed end portions of said swirl chamber, said fuel air passage extending toward said impingement wall to cause the air and fuel to impinge against said impingement wall.