Injection device having reduced pressure oscillations

Patent metadata

Field	Value
Publication number	US-9279401-B2
Application number	US-201013574433-A
Country	US
Kind code	B2
Filing date	Dec 7, 2010
Priority date	Jan 25, 2010
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

An injection device for injecting fuel, including a fuel supply path, through which fuel is able to be supplied, an injector having a spray orifice, from which the supplied fuel is ejected, a valve element, which is movable using an actuator, for opening the spray orifice and for closing it, and a throttle, which is situated in the fuel supply path, a distance of the throttle from the spray orifice along the fuel path having a length which is equivalent to the wavelength of a characteristic frequency of the injection device.

First claim

What is claimed is:

1. An injection device for injecting a medium, comprising:
a medium supply path, through which a medium is able to be supplied;
an injector having a spray orifice, from which the supplied medium is sprayed out;
a valve element, which is movable using an actuator, to open the spray orifice and to close it; and
a throttle situated in the medium supply path;
wherein a distance of the throttle from the spray orifice along the medium supply path has a length which is equivalent to a wavelength of a natural frequency of the injection device.

2. The injection device of claim 1 , wherein the throttle is situated in the injector.

3. The injection device of claim 1 , wherein the throttle is a separate component.

4. The injection device of claim 1 , wherein the throttle is integrated into a component of the medium path.

5. The injection device of claim 1 , wherein the throttle has a ratio of length to a passage diameter, which is between 0.01 to 100.

6. The injection device of claim 1 , wherein the throttle is developed symmetrically to at least one of a center axis and a plane that is perpendicular to the center axis.

7. The injection device of claim 1 , wherein at one inflow end and at one outflow end the throttle has a wide bevel.

8. The injection device of claim 1 , wherein the medium supply path runs essentially as a straight line between the spray orifice and the throttle.

9. An injection device for injecting fuel or water for exhaust gas aftertreatment, comprising:
at least one of a fuel supply path and a water supply path, through which at least one of a fuel and water is able to be supplied;
an injector having a spray orifice, from which at least one of the supplied fuel and the supplied water is sprayed out;
a valve element, which is movable using an actuator, to open the spray orifice and to close it; and
a throttle situated in at least one of the fuel supply path and the water supply path;
wherein a distance of the throttle from the spray orifice along at least one of the fuel supply path and the water supply path has a length which is equivalent to a wavelength of a natural frequency of the injection device.

10. The injection device of claim 1 , wherein the throttle has a ratio of length to a passage diameter, which is between 1 to 5.

11. The injection device of claim 1 , wherein the throttle has a ratio of length to a passage diameter, which is between 2 and 3.

Assignees

• Rogler Philipp
• Bosch Gmbh Robert

Inventors

• Rogler Philipp

Classifications

• F02M69/462

  Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down · CPC title

• F02M55/02 Primary

  Conduits between injection pumps and injectors {, e.g. conduits between pump and common-rail or conduits between common-rail and injectors} · CPC title

• F02M2200/28

  Details of throttles in fuel-injection apparatus · CPC title

• F02M2200/315

  for damping fuel pressure fluctuations · CPC title