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Distributor fuel injection pump

A fuel injection pump and distributing technology, which is applied in the field of distributing fuel injection pumps, can solve problems such as fuel injection pump performance failures, achieve the effect of improving the flow ratio and reducing the formation of air bubbles

Inactive Publication Date: 2002-05-01
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, in the long run, it can lead to performance failures in the fuel injection pump, especially if the erosion extends to the valve seats

Method used

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  • Distributor fuel injection pump
  • Distributor fuel injection pump
  • Distributor fuel injection pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The distribution fuel injection pump shown partially in longitudinal section in FIG. 1 has a pump housing, not visible here, which is closed off in a liquid-tight manner by a pump head 10 . Between the pump housing and the pump head, an unspecified low-pressure part 45 is enclosed, which is also a low-pressure oil supply part. Into the pump head 10 a cylinder bushing is inserted which, together with its inner bore 22 , serves to accommodate a distributor shaft 11 . The distributor shaft is rotationally driven by a drive shaft (not shown) via a coupling part 12 and is fixed in the axial direction. In the region of the shoulder protruding into the low-pressure part 45 there is at least one transverse bore 25 in which the pump piston 17 is seated and which encloses a pump working chamber 18 therebetween. The pump pistons are driven respectively inwards in the direction of the pump working chamber 18 by a cam ring which surrounds them on all four sides and is not further s...

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PUM

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Abstract

A fuel injection pump of the distributor type which has a reciprocatingly driven pump piston that is load-bearing in a rotating distributor shaft which pumps fuel out of a pump work chamber to various fuel injection valves via a distributor opening. To control the duration of high-pressure injection, an electrically actuated valve is provided with a valve member in a valve chamber that communicates with the pump work chamber and from a second valve chamber, communicates with a low-pressure region. To terminate the high-pressure injection, the valve member makes a communication between the two valve chambers, whereupon the outflow of the fuel stream is controlled by disposing a diameter constriction in the connecting line, thus reducing any tendency to cavitation.

Description

technical field [0001] The invention relates to a distribution type fuel injection pump. Background technique [0002] In such a fuel injection pump known from WO-95 / 02760, a plurality of pump pistons arranged perpendicularly to the direction of rotation of the distributor are provided, like a radial piston pump, with a pump working chamber enclosed therebetween. In known fuel injection pumps of this type, the connecting line for supplying fuel to the pump working chamber and for reducing the pressure has a constant, unrestricted cross section. In such pumps, when the valve is open, the fuel is sucked in through the entire suction stroke of the pump piston, and the valve is closed again in order to determine the effective discharge stroke of the pump piston. Then, within a certain rotation angle range or within a certain period of time, according to the position of the distributor, the fuel injection pump delivers fuel that has reached the high injection pressure to each fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M41/14F02M59/46
CPCF02M41/1411F02M59/466
Inventor 海因茨·纳特杜尔夫特内斯特·罗德里格斯-阿马亚安德烈亚斯·杜特胡贝特·格赖夫
Owner ROBERT BOSCH GMBH