Fuel injector including outer valve needle and inner valve needle slidable within a passage provided in the outer valve needle
First Claim
1. A fuel injector comprising a first, outer valve needle, a second inner valve needle slidable within a passage provided in the outer valve needle, and a load transmitter whereby movement of the outer valve needle can be transmitted to the inner needle, the load transmitter comprising a shoulder associated with the first needle which is cooperable with the second needle to transmit movement of the first needle to the second needle once the first needle has moved beyond a predetermined distance, the shoulder being defined by a surface of a sleeve located within a bore formed in the first needle, wherein the second needle includes a region of increased diameter which is engageable with the shoulder, the region of increased diameter being compressible and being arranged within an enclosed chamber defined by the bore formed in the first needle such that fuel under high pressure acts on the second needle, in use, to urge the second needle against a seating.
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Accused Products
Abstract
A fuel injector includes a first needle, and a second needle slidable within a passage formed in the first needle. The needles are engageable with respective seatings to control fuel delivery through respective groups of outlet openings. A load transmitter is provided whereby movement of the first needle can be transmitted to the second needle. An alternative injector includes a second needle provided with formations defining an integral resilient biasing arrangement.
33 Citations
12 Claims
- 1. A fuel injector comprising a first, outer valve needle, a second inner valve needle slidable within a passage provided in the outer valve needle, and a load transmitter whereby movement of the outer valve needle can be transmitted to the inner needle, the load transmitter comprising a shoulder associated with the first needle which is cooperable with the second needle to transmit movement of the first needle to the second needle once the first needle has moved beyond a predetermined distance, the shoulder being defined by a surface of a sleeve located within a bore formed in the first needle, wherein the second needle includes a region of increased diameter which is engageable with the shoulder, the region of increased diameter being compressible and being arranged within an enclosed chamber defined by the bore formed in the first needle such that fuel under high pressure acts on the second needle, in use, to urge the second needle against a seating.
- 9. A fuel injector comprising a first, outer valve needle, a second, inner valve needle slidable within a passage provided in the outer valve needle, and load transmitting means, the load transmitting means comprising a hydraulic link.
Specification