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Fuel injection pump with injection all justing piston for timing beginning of injection

A technology of start time and fuel injection pump, applied in the direction of fuel injection pump, fuel injection control, fuel injection device, etc., can solve problems such as pressure fluctuation and relative motion

Inactive Publication Date: 2002-02-27
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using such an injection start time regulator, the problem arises that, due to the alternating loads in the cam drive of the injection pump, this can lead to pressure fluctuations in the pressure chamber area of ​​the injection start time regulator or in the Relative movement between injection regulating piston and control spool

Method used

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  • Fuel injection pump with injection all justing piston for timing beginning of injection
  • Fuel injection pump with injection all justing piston for timing beginning of injection

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Embodiment Construction

[0011] Injection pumps in distributor construction can be used either as pumps with an axially driven pump piston not only used as a distributor but also as a pump piston, or as radial pistons that feed radially into the delivery channel in the distributor . exist figure 1 Such a so-called radial piston pump of known construction is shown in section in FIG. Here, four pump pistons 1 are provided, which are seated displaceably and sealingly in radial bores 3 of the distributor 2 in a common radial plane at the same angular distance from the distributor 2 axis. They enclose a common pump working chamber 4 on one of their end faces, and this pump working chamber is filled with fuel oil in the radially outward stroke of pump piston 1 in a known, not further shown here manner, and in the pump piston diameter On the inward stroke, a pressure line, also not visible here, is connected to a distributor opening on the housing surface of the distributor 2, where the distributor opening...

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PUM

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Abstract

Disclosed is a fuel injection pump provided with a timing device piston (16) for timing beginning of injection and designed as a slaved piston for a slide valve (28) located therein. Said piston encompasses a working chamber (20) on one of its sides and is driven by pressure in said working chamber in opposition to the force of a return spring (23) and connected to a substantially fixed part of fuel injection pump cam drive. In order to avoid the effects of pressure backlash arising from kickback on the slide valve (28) and its setting, the inlet cross-section of connecting conduit is designed as an extended elongated cross-section which extends in the sliding direction of said slide valve. This enables trouble-free setting of the slide valve (28) and more precise vibration-free setting of timing device piston (16) and beginning of injection.

Description

technical field [0001] The invention relates to a fuel injection pump with an injection regulating piston for adjusting the injection start time. Background technique [0002] For such a fuel injection pump known from DE-A1-35 32 719, as a connecting line between the working chamber and the cylinder bore, a shaft parallel to the axis starting from the end face of the fuel injection regulating piston facing the working chamber is provided. Blind bore which intersects at its end with a transverse bore extending radially from the outside to the cylinder bore. The cross-section of this transverse bore at the entrance to the cylinder bore is circular. [0003] When using such an injection start time regulator, the problem arises that, due to the alternating loads in the cam drive of the injection pump, this can lead to pressure fluctuations in the pressure chamber area of ​​the injection start time regulator or in the A relative movement occurs between the injection regulating ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D1/18F02M41/12F02M41/14
CPCF02D2001/186F02D1/183F02M41/128F02M41/1411F02D1/18
Inventor 沃尔夫冈·费尔曼托马斯·库尔德尔
Owner ROBERT BOSCH GMBH