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Injector

An injector and fuel injection technology, which is applied in the direction of fuel injection devices, machines/engines, engine components, etc., can solve the problems of difficult access to valve sleeve seats, difficult cladding, and inability to construct convex conical seats, etc., to achieve improvement Clamping action, increased strength, and easy-to-manufacture effects

Inactive Publication Date: 2012-03-21
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage is that a guide on the outer circumference of the valve sleeve must be provided in the valve body for the valve sleeve
Also for the case where the sleeve seat should be clad, the sleeve seat is very inaccessible for the cladding process which makes the cladding more difficult
In addition, due to manufacturing technical considerations, the valve sleeve seat at the bottom of the guide can only be configured as a flat seat or a concave tapered seat, but cannot be configured as a convex tapered seat

Method used

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Embodiment Construction

[0019] In the figures, the same components and components having the same function are denoted by the same reference numerals.

[0020] exist figure 1 A sectional view of an injector 1 designed as a common rail injector for injecting fuel into a combustion chamber of an internal combustion engine (not shown) is shown very schematically in FIG. figure 1 Only the working principle of the injector should be explained, wherein the size ratios shown do not correspond to the actual size ratios.

[0021] The injector 1 comprises a one-piece or multi-part valve element 2, shown only in part, which is movable between an open position and a closed position. In the open position of the valve element (moved upwards in the plane of the drawing), the valve element 2 releases the fuel flow from the pressure chamber 3 into the combustion chamber of the internal combustion engine through a nozzle hole arrangement not shown.

[0022] The upper end face 4 of the valve element 2 delimits a cont...

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Abstract

The invention relates to an injector (1) for injecting fuel into a combustion chamber of an internal combustion engine, particularly a common rail injector, comprising a control valve (18) having an axially adjustable valve sleeve (17) that is guided on the outer circumference, the control valve being used to release and block the fuel flow through a discharge duct (14) introduced in a valve piece in the direction of a low-pressure region (12) of the injector (1) from a control chamber (5), which is operatively connected to an axially adjustable valve element (2). According to the invention, the valve sleeve (17) is guided on the outer circumference by a guide element (26), the element being formed as a component that is separate from the valve piece (6) and fixed to the valve piece (6).

Description

technical field [0001] The present invention relates to an injector, in particular a common rail injector, for injecting fuel into a combustion chamber of an internal combustion engine. Background technique [0002] EP 1 612 403 A1 describes a common rail injector having an axially pressure-balanced control valve (servo valve) for blocking and opening the fuel outflow channel from the control chamber. The fuel pressure inside the control chamber can be influenced by means of the control valve, wherein the control chamber is permanently supplied with fuel under high pressure via the inflow throttle. The valve element is moved between an open position and a closed position by a change in fuel pressure inside the control chamber, wherein the valve element in its open position releases the flow of fuel into the combustion chamber of the internal combustion engine. The control valve includes a valve sleeve which can be moved in the axial direction by means of an electromagnetic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M47/02F02M63/00
CPCF02M63/0071F02M63/007F02M63/008F02M47/027
Inventor B·施特赖歇尔R·努斯鲍墨R·海因茨M·门尼肯H·拉普W·施特克莱因C·法尔廷N·埃森门格尔
Owner ROBERT BOSCH GMBH
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