Miniature fuel injection nozzle and holder assembly

Claim 2

A fuel injection nozzle and holder assembly for internal combustion engines comprising: an elongate nozzle body having an axially extending bore formed therein; an elongate holder body having an axially extending passage formed therein; means securing the holder body and the nozzle body together with the bore and the passage in generally axial alignment; an elongate reciprocative valve member disposed in the bore and openable in response to the fuel pressure within the nozzle body; means defining at least one transversely extending, axially elongated slot in the holder body, the slot communicating at one side with the axially extending passage and opening at least at one end through the side of the holder body; means, including at least two compression springs positioned within the slot, acting through the axially extending passage for biasing the valve member to a normally closed position; and means defining fuel supply ducts in the holder body and the nozzle body for supplying pressurized fuel to the nozzle body for opening of the valve member and subsequent injection into the engine.

Claim 3

A fuel injection nozzle and holder assembly according to claim 1 wherein the valve member biasing means further includes means for controlling the compression of the springs so as to permit adjustment of tHe opening pressure of the valve member.

Claim 4

A fuel injection nozzle and holder assembly according to claim 2 wherein the opening pressure adjusting means comprises adjusting screw means located within the slot and accessible for adjustment through the open end thereof.

Claim 5

A fuel injection nozzle and holder assembly according to claim 1 wherein: the valve member biasing means further includes common guides for receiving the opposite ends of the compression springs; and the valve member includes a portion extending into the transverse slot through the axially extending passage, the adjacent spring guide being in force transmitting engagement with the extended portion of the valve member.

Claim 6

A fuel injection nozzle and holder assembly according to claim 4 wherein the common guides are interchangeable in position and are of substantially identical construction.

Claim 7

A fuel injection nozzle and holder assembly according to claim 4 further comprising means formed on the valve member and the holder body for limiting the opening travel of the valve member.

Claim 8

A fuel injection nozzle and holder assembly according to claim 1 wherein the valve member biasing means includes at least two sets of concentric springs.

Claim 9

A fuel injection nozzle and holder assembly according to claim 1 wherein: the valve member biasing means includes a guide for receiving the ends of the compression springs adjacent to the nozzle body; and the guide includes an elongate portion positioned within the axially extending passage in force transmitting engagement with the valve member.

Claim 10

A fuel injection nozzle and holder assembly according to claim 8 further comprising means formed in part on the holder body for limiting the opening travel of the valve member.

Claim 11

A fuel injection nozzle and holder assembly according to claim 1 wherein the compression springs are positioned in parallel relation.

Claim 12

A fuel injection nozzle and holder assembly according to claim 1 wherein the compression springs are positioned in symmetrically sloping relation.

Claim 13

A fuel injection nozzle and holder assembly according to claim 1 further comprising: means for enclosing at least the slotted portion of the holder body to prevent fuel leakage through the slot open end; and means, including a duct formed in the holder body and communicating with the transverse slot, for leaking off fuel escaping to the transverse slot through the axially extending passage.

Claim 14

A fuel injection nozzle and holder assembly for internal combustion engines comprising: an elongate nozzle body having an axially extending bore formed therein; an elongate holder body having an axially extending passage formed therein; means securing the holder body and the nozzle body together with the bore and the passage in generally axial alignment; an elongate reciprocative valve member disposed in the bore and openable in response to the fuel pressure within the nozzle body; means defining a plurality of interconnecting transverse slots symmetrically arranged relative to the axially extending passage in the holder body, each slot communicating at one side with the axially extending passage and opening at least at one end through the side of the holder body; means, including at least one compression spring positioned within each slot, acting through the axially extending passage for biasing the valve member to a normally closed position; and means defining fuel supply ducts in the holder body and the nozzle body for supplying pressurized fuel to the nozzle body for opening of the valve member and subsequent injection into the engine.

Claim 15

A fuel injection nozzle and holder assembly for internal combustion engines comprising: an elongate nozzle body having an axially extending bore formed therein; an elongate holder body having an axially extending passage formed therein; means securing the holder body and the nozzle body together with the bore and the passage in generally axial alignment; an elongate reciprocative valve member disposed in the bore and openable in response to the fuel pressure within the nozzle body; means defining a plurality of interconnecting transverse slots symmetrically arranged relative to the axially extending passage in the holder body, each slot communicating at one side with the axially extending passage and opening at least at one end through the side of the holder body; means, including at least one compression spring positioned within each slot, acting through the axially extending passage for biasing the valve member to a normally closed position; and means defining fuel supply ducts in the holder body and the nozzle body for supplying pressurized fuel to the nozzle body for opening of the valve member and subsequent injection into the engine.

Claim 16

A fuel injection nozzle and holder assembly according to claim 13 wherein the springs are arranged symmetrically about the axis of the valve member.

Claim 17

A fuel injection nozzle and holder assembly according to claim 13 wherein the valve member biasing means includes a common guide for receiving the ends of the compression springs adjacent To the nozzle body, the guide being shaped in cross section to correspond to the internal cross section of the holder body.

Claim 18

A fuel injection nozzle and holder assembly according to claim 13 wherein the valve member biasing means further includes means for controlling the compression of the springs so as to permit adjustment of the opening pressure of the valve member.

Claim 19

A fuel injection nozzle and holder assembly according to claim 13 wherein: the valve member biasing means further includes common guides for receiving the opposite ends of the compression springs; and the valve member includes a portion extending into the transverse slot through the axially extending passage, the adjacent spring guide being in force transmitting engagement with the extended portion of the valve member.

Claim 20

A fuel injection nozzle and holder assembly according to claim 17 further comprising means formed on the valve member and the holder body for limiting the opening travel of the valve member.

Claim 21

A fuel injection nozzle and holder assembly according to claim 13 wherein: the valve member biasing means includes a guide for receiving the ends of the compression springs adjacent to the nozzle body; and the guide includes an elongate portion positioned within the axially extending passage in force transmitting engagement with the valve member.

Claim 22

A fuel injection nozzle and holder assembly according to claim 19 further comprising means formed in part on the holder body for limiting the opening travel of the valve member.

Claim 23

A fuel injection nozzle and holder assembly according to claim 13 further comprising: means for enclosing at least the slotted portion of the holder body to prevent fuel leakage through the open ends of the slots; and means, including a duct formed in the holder body and communicating with the transverse slots, for leaking off fuel escaping to the slots through the axially extending passage.

Claim 24

A fuel injection nozzle and holder assembly according to claim 13 wherein the springs in the respective slots are positioned in parallel relation to each other spring.

Claim 25

A fuel injection nozzle and holder assembly according to claim 13 wherein the springs in the respective slots are positioned in symmetrically sloping relation to each other spring.