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Pilot injection pump

A fuel injection pump, fuel pump technology, applied in the direction of fuel injection pump, fuel injection device, charging system, etc.

Inactive Publication Date: 2006-08-30
STANADYNE OPERATING CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pilot injection event just before the main injection can occur without refilling issues because each precompression chamber, once filled, is used for the injection event including the pilot injection and the main injection

Method used

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  • Pilot injection pump
  • Pilot injection pump
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Examples

Experimental program
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Embodiment Construction

[0012] exist figure 1 and figure 2 A typical embodiment of a rotary distributor fuel injection pump according to the invention is shown in FIG. A substantially tubular hydraulic head 12 having a forward end 14 and a rearward end 16 defines a plurality of substantially coplanar fuel input ports 18 spaced circumferentially about the hydraulic head and a plurality of substantially coplanar fuel input ports 18 spaced circumferentially about the hydraulic head. face fuel drain port 20. A substantially cylindrical distributor head 22 is received approximately coaxially within the tubular hydraulic head 12 and is supported by the tubular hydraulic head 12 so that the distributor head 22 rotates therein. The distributor head 22 has a front portion 24 extending axially from the front end of the hydraulic head and a rear portion 26 journalled (at 28 ) to the hydraulic head 12 . The front portion 24 of the distributor includes securing means 30 for engaging a rotary drive means (not ...

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PUM

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Abstract

The present invention adds a separate pilot pumping chamber and associated pumping plungers and cam followers axially offset from the main pumping chamber and pumping plungers. The axis of the pilot plunger bores is angularly offset from the axis of the main plunger bores so that the pilot plungers are actuated by a different set of cam lobes of the cam profile. This arrangement allows one pumping chamber to be refilled while the other pumping chamber is being discharged. A pilot injection event well in advance of the main injection can take place without refilling problems because each pumping chamber fills once for an injection event that includes a pilot and main injections. Discharge passages from the respective pumping chambers are ported to deliver the pilot and main fuel pulses to the same discharge port.

Description

technical field [0001] This invention relates generally to high pressure pumps for fuel injection systems, and more particularly to rotary distributor fuel pumps for such systems. Background technique [0002] Motor vehicles are required to comply with increasingly stringent noise and exhaust emission limits. Published investigations have shown that noise and exhaust emissions from internal combustion engines are influenced by the time profile of the fuel flow through the injector holes, in other words the "regular shape" of the injection. Considerable effort has been expended to adjust the regular shape and injection timing of injection in response to the specific needs of a particular engine application. Previous efforts to control the regular shape of injection included modifications to the injector assembly and fuel pump. [0003] One type of fuel pump of particular relevance to the present invention is the rotary distributor fuel pump. In known fuel pumps of this typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/10
CPCF02M41/1405F02M45/04F02M41/1411
Inventor 马尔科姆·希金斯
Owner STANADYNE OPERATING CO LLC