Self-cleaning fuel injection valve
First Claim
1. Fuel injection nozzle arrangement for an internal combustion engine, comprising:
- a nozzle body;
an injection needle movably disposed in the nozzle body and engageable with a needle seat at the nozzle body,a pocket reservoir formed at the downstream end of the needle seat, injection holes with different injection directions extending from the pocket reservoir such that a bottom surface of the pocket reservoir lies below a level at which the injection holes open into said reservoir, allowing fuel to be trapped in said reservoir following an injection cycle;
an abutment body movably disposed in the needle between a first position blocking the pocket reservoir and a second position freeing the pocket reservoir, said abutment body extending into an area of the reservoir adjacent to the injection holes to at least partially block said injection holes and to substantially fill said reservoir when said abutment body is in said first position;
abutment body biasing means for biasing said abutment body toward said first position blocking the pocket reservoir, and;
wherein said abutment body, injection needle and biasing means are configured so that said abutment body is removed to the second position prior to movement of the injection needle to begin the injection cycle, and wherein said abutment body is moved to the first position immediately following the injection cycle to force the trapped fuel from the reservoir.
1 Assignment
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Accused Products
Abstract
A fuel injection nozzle is proposed with an opening needle opposed against the flow direction and in which a spring loaded abutment body is guided for longitudinal sliding movement, which body with its free end protrudes into a blind pocket reservoir of the nozzle after a successful injection. Before the beginning of the injection this blind pocket reservoir is opened to open injection holes with different injection directions branching off from the blind pocket reservoir. Through a nozzle embodiment of this kind the damaging space in the blind pocket reservoir is substantially avoided and the proportion of the unburned hydrocarbons is substantially reduced.
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Citations
8 Claims
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1. Fuel injection nozzle arrangement for an internal combustion engine, comprising:
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a nozzle body; an injection needle movably disposed in the nozzle body and engageable with a needle seat at the nozzle body, a pocket reservoir formed at the downstream end of the needle seat, injection holes with different injection directions extending from the pocket reservoir such that a bottom surface of the pocket reservoir lies below a level at which the injection holes open into said reservoir, allowing fuel to be trapped in said reservoir following an injection cycle; an abutment body movably disposed in the needle between a first position blocking the pocket reservoir and a second position freeing the pocket reservoir, said abutment body extending into an area of the reservoir adjacent to the injection holes to at least partially block said injection holes and to substantially fill said reservoir when said abutment body is in said first position; abutment body biasing means for biasing said abutment body toward said first position blocking the pocket reservoir, and; wherein said abutment body, injection needle and biasing means are configured so that said abutment body is removed to the second position prior to movement of the injection needle to begin the injection cycle, and wherein said abutment body is moved to the first position immediately following the injection cycle to force the trapped fuel from the reservoir. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification