Fuel injection valve for internal combustion engines

Details Fuel injection valve for internal combustion engines Fuel injection valve for internal combustion engines

1999-07-29

2000-09-05

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

2395337, 23953312, 239541, 239453, 251284, F02M 5900

Patent

active

061130117

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a fuel injection valve for internal combustion engines. One such fuel injection valve, known from German Patent Application 1 96 34 716.5, not published prior to the filing date of the present application, has a valve body with an axial through bore in which a pistonlike valve member is guided; to control an injection cross section this valve member is displaceable outward by the high fuel pressure, counter to the force of a valve spring. On its end toward the combustion chamber, the valve member has a closing head that protrudes from the bore of the valve body; the closing head forms a valve closing member, and a valve sealing face is disposed on its side toward the valve body; with the valve sealing face, the closing head cooperates with a valve seat face disposed on the face end of the valve body toward the combustion chamber. In addition, at least one injection port, originating in a pressure chamber formed between the valve member and the bore, is provided on the valve member at the level of the closing head. The outlet opening of the injection port is covered by the valve body in the closing position of the valve member, and it is not opened, in the course of the outward-oriented opening stroke of the valve member, until the valve member emerges from the bore. With its end remote from the combustion chamber and from the closing head, the valve member protrudes into a spring chamber, which is formed in a holding body that is axially braced with the valve body. On its shaft end remote from the combustion chamber, the valve member has a spring plate, and a closing spring is housed between the spring plate and a stop contacting the valve body and structurally connected to the housing.
The maximum opening stroke motion of the valve member is defined by the contact of a bearing face, formed by a collar on the valve member shaft, with a stationary stroke stop ring, and the maximum opening stroke can be adjusted by way of the stroke stop ring.
The known fuel injection valve has the disadvantage, however, that the entire bracing force of the valve spring is transmitted to the valve body only via the stroke stop ring. Because of the small bearing face area of the stroke stop ring, this leads to so-called hammering into the valve body, and as a consequence the opening stroke of the valve member may change. The adjustment of different opening stroke courses is also done by means of stroke stop rings of various sizes, and as a result in each case the spring prestressing force of the valve spring also changes, so that the opening characteristic of the fuel injection valve changes again as well.


ADVANTAGES OF THE INVENTION

The fuel injection valve according to the invention for internal combustion engines has an advantage over the prior art that the bracing force of the valve spring is initiated via the spacer ring onto the support ring surrounding the split stroke stop ring. This support ring is supported stationary relative to the valve body, and it can be braced directly with its annular end face, or via the fastening of the stroke stop ring end place, on the valve body. In this way, a large bearing face is achieved for introducing force into the valve body, which reliably prevents the components from being hammered into the end face of the valve body. Furthermore, the use of stroke stop rings of various heights to establish the maximum valve member opening stroke motion now no longer affects the spring prestressing force of the valve spring, since the valve spring is braced on the valve body via the support ring, and the stroke stop ring preferably has some play relative to the spacer ring. The stroke stop ring is preferably embodied in two parts but can alternatively also be subdivided into more partial segments. The preferably two half shells of the axially split stroke stop ring, in the mounted state of the fuel injection valve, then form a completely closed stroke stop ring, which on its face end toward the spacer ring has a conical stroke stop face and rests with its

REFERENCES:
patent: 5405088 (1995-04-01), Gordon et al.
patent: 5497947 (1996-03-01), Potz et al.
patent: 5518184 (1996-05-01), Potz et al.
patent: 5522550 (1996-06-01), Potz et al.
patent: 5743470 (1998-04-01), Schlaf et al.
patent: 5755385 (1998-05-01), Potz et al.

Affiliated with

Also associated with

Rating

Fuel injection valve for internal combustion engines does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fuel injection valve for internal combustion engines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel injection valve for internal combustion engines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2203694