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fuel pump

A technology of fuel and common rail fuel, which is applied to fuel injection pumps, pumps, fuel injection devices, etc., and can solve problems such as aggravation

Active Publication Date: 2020-02-21
DELPHI TECH IP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This problem is exacerbated when the pump 1 is operated at high pressures (for example in excess of 2000 or 2500 bar), where the dimensions of the bore 11 and the plunger 9 may undergo geometric changes which may increase the dynamics passing through the plunger 9 leakage

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0034] will now refer to Figure 3 to Figure 5 A high-pressure fuel pump 100 according to a first embodiment of the present invention is described. The fuel pump 100 is used to pump diesel fuel to a common rail of an internal combustion engine.

[0035] The fuel pump 100 includes a pump head 101 (in Figure 4 and Figure 5 shown in detail). The pump head 101 includes a pump head housing 103 that includes a housing body portion 105 and a housing cylindrical protrusion 107 (also referred to as a tower portion). A cylindrical protrusion 107 protrudes from the housing body portion 105 . Pump head housing 103 includes an elongated bore 109 extending into housing body portion 105 and passing through cylindrical protrusion 107 . The bore 109 defines a pumping chamber 111 and a pressurizing chamber 119 . A plunger 113 having a longitudinal axis X is slidably received within bore 109 and is configured to pressurize fuel in pumping chamber 111 . The pump head 101 is arranged in f...

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PUM

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Abstract

The present disclosure relates to a pump (100, 200) for supplying high pressure fuel to a common rail fuel injection system. The pump (100, 200) comprises: an elongated bore (109, 209) forming a pumping chamber (111, 211) and a pressurizing chamber (119, 219); a pumping element (113, 213), The pumping element is configured to reciprocate within said elongated bore (109, 209) to pump fuel from said pumping chamber (111, 211); and pressurizing means for pumping said The fuel in the pressurization chamber (111, 211) is pressurized. The pressurization chamber (119, 219) extends at least partially around the periphery of the pumping element (113, 213) to reduce leakage from the pumping chamber (111, 211).

Description

technical field [0001] The present invention relates to a fuel pump for a common rail fuel injection system for supplying high-pressure fuel to an internal combustion engine. The invention is particularly applicable to compression ignition (diesel) engines. Background technique [0002] High pressure fuel pumps for common rail fuel injection systems typically include one or more hydraulic pump heads where fuel is pressurized in a pumping chamber by the reciprocating motion of a plunger. Typically, low pressure fuel is supplied to the pump head from a fuel supply such as a vehicle fuel tank. Once pressurized, high pressure fuel is supplied from the pumping chamber to the common rail. [0003] exist figure 1 and figure 2 A known high-pressure fuel pump 1 comprising a hydraulic pump head 2 is shown in . The pump head 2 comprises a pump head housing 3 with a housing body region 5 and a housing projection 7 . The pumping plunger 9 is arranged to reciprocate within a bore 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M59/44F04B1/0421F04B1/0448
CPCF02M59/442F02M61/167F02M2200/26F04B1/0421F04B1/0448
Inventor T·佩德利P·加兰德
Owner DELPHI TECH IP LTD