Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1992-04-02
1993-05-11
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
2395851, 25112921, 25112915, B05B 130
Patent
active
052094081
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a fuel injection valve of the generic type which includes a valve housing, a valve seat body arranged in the valve housing and having an axially directed longitudinal hole terminating at a collar step which narrows into a valve seat with an outlet opening; a valve closing member is inserted in the longitudinal hole and is provided at its end facing the valve seat with a valve closing body which is guided in a hollow cylindrical guideway.
A fuel injection valve of the generic type is known from the DE-PS 31 02 642 and the U.S. Pat. No. 4,403,741. In such a valve, a part described as a nozzle, and a separate perforated disc have been combined to form an assembly. The perforated disc with valve seat and with a hollow cylindrical guideway, guides the valve closing body during its axial movement. The nozzle is provided with an outlet opening for the fuel to be injected, and it locates the perforated disc in a press fit.
Other fuel injection valves are known, in which the nozzle and the valve seat are designed to form a one-piece valve seat body--without a hollow cylindrical guideway.
The manufacturing costs for the perforated disc are high due to the requirements for high accuracy with regard to the concentricity of the hollow cylindrical guideway to the valve seat. Moreover, the nozzle requires very precise machining in the area for the location of the perforated disc. This makes the individual parts and their assembly more expensive. Minor deviations from the size tolerances of these individual parts will cause a deformation of the valve seat during the assembly of the fuel injection valve. Such quality defects cause a higher friction between the valve closing member, the guideways, and the valve seat.
This friction leads to hysteresis errors during the control of the fuel injection valve, to wear, and also to an increasingly irregular pattern of fuel dispersal. This means that the fuel is less well processed, and the individual engine cylinders are unevenly supplied with fuel. Currently, the fit between the valve closing body and the guideways, which is of coarser tolerances, any eccentric seating of the valve closing body on the valve seat or on the guideway while the fuel injection valve is open, will cause trouble, resulting in the consequences previously mentioned.
SUMMARY OF THE INVENTION
In the fuel injection valve in accordance with the invention the hollow cylindrical guideway is formed in a separate guide ring which is spaced at a radial distance from the wall of the longitudinal hole in the valve seat body; the guide ring is held in a position around the valve seat by tensional holding forces which are greater than external forces exerted thereon by the valve seat body during normal operation of the fuel injection valve. In contrast to prior art fuel injection valves of this type, the invention has the advantage that the hollow cylindrical guideway of a separate guide ring will guide the valve closing body such that it embraces it particularly closely and concentrically, so that this position is secured when the valve closing body is opening and flooded with fuel.
A closer fit between the valve closing body and the hollow cylindrical guideway within closer tolerances is possible with the economic, separate guide ring as the position of the guide ring is always individually adjustable in relation to the valve seat. This means that the friction between the valve closing body and the valve seat is very safely reduced, because the eccentricity of the valve closing body in relation to the valve seat is reduced by virtue of the close guidance. This means that a more precise response of the fuel injection valve is achieved, with a more precise metering of the fuel and an improved pattern of fuel dispersal. The position of the guide ring in relation to the valve seat cannot be influenced by temperature fluctuations due to the radial separation of the aperture which surrounds it. Other advantageous refinements of the invention result from the subordi
REFERENCES:
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patent: 4423841 (1984-01-01), Palma
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patent: 4597558 (1986-07-01), Hafner et al.
patent: 4984744 (1991-01-01), Babitzka et al.
patent: 4995559 (1991-02-01), Okamoto et al.
Kashnikow Andres
Robert & Bosch GmbH
Striker Michael J.
Trainor Christopher G.
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