Fuel-injection device for an internal-combustion engine
First Claim
1. A fuel-injection device for an internal-combustion engine comprising at least one injection nozzle, whose nozzle body has at least one spray hole, wherein the fuel delivery to said spray hole is controllable by way of a valve needle displaceable in the nozzle body and wherein the effective injection cross section is variable by a control device whose position depends on operating parameters of the internal-combustion engine, wherein the fuel is directly conducted to the spray hole (18, 19), in the operating position of the control device (21), wherein the fuel is conducted to the spray hole (18, 19) only by way of a nozzle opening (24, 25) substantially coaxially aligned relative to the spray hole (18, 19), in the rest position of the control device (21), wherein the cross section of said nozzle opening is smaller than the cross section of said spray hole (18, 19), and wherein the control device (21) is changed over between the rest position and the operating position by an actuating element (30) independently of the position of the valve needle (14).
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Accused Products
Abstract
The effective injection cross section of a fuel-injection device is varied by an adjustable shutoff element, whereby the shuttoff element is actuatable by an actuating element as a function of operating parameters of the internal-combustion engine. In the operating position, the shutoff element conducts the fuel directly to a spray hole with large cross section, but in the rest position the fuel is only conducted to the spray hole by way of a nozzle opening with a smaller cross section coaxially adjusted to the spray hole.
52 Citations
7 Claims
- 1. A fuel-injection device for an internal-combustion engine comprising at least one injection nozzle, whose nozzle body has at least one spray hole, wherein the fuel delivery to said spray hole is controllable by way of a valve needle displaceable in the nozzle body and wherein the effective injection cross section is variable by a control device whose position depends on operating parameters of the internal-combustion engine, wherein the fuel is directly conducted to the spray hole (18, 19), in the operating position of the control device (21), wherein the fuel is conducted to the spray hole (18, 19) only by way of a nozzle opening (24, 25) substantially coaxially aligned relative to the spray hole (18, 19), in the rest position of the control device (21), wherein the cross section of said nozzle opening is smaller than the cross section of said spray hole (18, 19), and wherein the control device (21) is changed over between the rest position and the operating position by an actuating element (30) independently of the position of the valve needle (14).
Specification