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Accumulator distribution type fuel injection pump

A fuel injection pump and pressure accumulator technology, which is applied in the direction of fuel injection pumps, fuel injection devices, variable displacement pump components, etc., can solve problems such as complex composition, difficulty in ensuring strength, and complex structure, so as to improve reliability and prevent Partial wear, the effect of improving durability and reliability

Inactive Publication Date: 2003-11-12
YANMAR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In this way, high pressure is always applied to the connecting parts of each functional member constituted as a separate structure, so it is difficult to ensure strength, and there are cases where oil leakage and damage are low, and the structure becomes complicated.
[0007] In addition, in the above-mentioned accumulator-type fuel injection pump, a plurality of plunger portions that pressurize fuel into the accumulator chamber are provided, and the plurality of plunger portions are arranged side by side along the cam axis, so that the accumulator-type fuel injection pump is large in size. , while becoming a complex structure

Method used

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  • Accumulator distribution type fuel injection pump
  • Accumulator distribution type fuel injection pump
  • Accumulator distribution type fuel injection pump

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Embodiment Construction

[0034] In order to illustrate the present invention in more detail, it is described below with reference to the accompanying drawings.

[0035] First, a schematic configuration of an accumulator-dispensing fuel injection pump of the present invention will be described. Such as figure 1 , figure 2 ,and Figure 3 ~ Figure 5 As shown, the fuel injection pump 1 configured as a pressure accumulator distribution type fuel injection pump includes an accumulator chamber 31 for accumulating high-pressure fuel, a plunger 7 for pumping fuel into the accumulator chamber 31, and The fuel pressure-fed by the pressure chamber 31 is distributed and supplied to the distribution shaft 9 and the like of the injection nozzle 29 of each cylinder.

[0036] The plunger 7 is driven to slide up and down by the cam 5 formed on the camshaft 4 through the plunger 11 , and the plunger chamber 7 a formed above the plunger 7 is connected to the accumulator chamber 31 through the check valve 28 .

[003...

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Abstract

An accumulator distribution type fuel injection pump usea as a fuel injection pump for low-pollution diesel engine low in fuel consumption and capable of meeting an exhaust emission control requirements, wherein a high-pressure fuel accumulated in an accumulating chamber is distributedly fed to each cylinder through a distribution shaft, functional members forming high-pressure routes such as a plunger, an injection control valve for fuel injection control, the accumulating chamber, and the distribution shaft are disposed inside a hydraulic base (Hb), and a plunger part for accumulating fuel into the accumulating chamber is installed in the hydraulic base.

Description

technical field [0001] The present invention relates to a configuration of an electronically controlled pressure-accumulation distribution type fuel injection pump that distributes and supplies high-pressure fuel accumulated in an accumulator chamber to each cylinder by a distribution device. Background technique [0002] In recent years, there is a tendency for diesel engines to have stricter exhaust emission restrictions, and it is desired to reduce fuel consumption and reduce NOx and particulates. In order to meet this demand, increasing the pressure of fuel injection pressure for improving combustion efficiency has been developed. [0003] In addition, there are increasing numbers of electronically controlled accumulator-type fuel injection pumps that can increase the fuel injection pressure and control the injection pressure arbitrarily regardless of the number of revolutions of the engine. [0004] This accumulator-type fuel injection pump supplies high-pressure fuel a...

Claims

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Application Information

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IPC IPC(8): F02M41/06F02M41/16F02M59/36F02M63/02F04B1/04F04B23/02F04B49/22F04B53/16
CPCF02M59/366F04B53/16F04B49/22F02M41/16F02M63/0225F04B1/0421F04B23/02F02M41/06
Inventor 新宫健次
Owner YANMAR CO LTD
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