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Pump head for a fuel pump

A pump pressure head, fuel pump technology, applied in fuel injection pumps, components of pumping devices for elastic fluids, fuel injection devices, etc., can solve the problems of efficiency loss, leakage fuel increase, etc., to avoid strength and resistance fatigue effect

Inactive Publication Date: 2014-11-19
DELPHI INT OPERATIONS LUXEMBOURG S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the higher pumping pressure, leakage fuel down the plunger bore tends to increase, resulting in an undesired loss of efficiency

Method used

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  • Pump head for a fuel pump
  • Pump head for a fuel pump
  • Pump head for a fuel pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] Refer to the attached figure 1 , providing a fuel pump assembly 10 that includes a pump housing 12 ( figure 1 Only a part thereof is shown in ) and the pump head 14 attached to the pump housing 12 .

[0037] The pump housing 12 defines a chamber or interior volume 16 that houses a cam 18 that is driven by a drive shaft (not shown). The cam 18 and the drive shaft together form part of a cam drive. A cylindrical port 20 extends from the interior volume 16 to a mounting face 22 of the pump housing 12 .

[0038] The pump head 14 includes a housing body portion 24 mounted on the outside of the pump housing 12 and defining a pump head mounting face 26 . The pump head 14 is attached to the pump housing 12 via suitable fasteners 28 for inter-clamping the respective mounting faces 22 , 26 of the pump housing 12 and the main body portion 24 of the pump head 14 , thereby closing and sealing port 20.

[0039] The pump head 14 also includes a housing turret portion 30 protrudin...

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PUM

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Abstract

A pump head (14) for a high-pressure fuel pump is disclosed. The pump head comprises a head housing including a body portion (24), and a turret portion (30) extending from the body portion (24), a pumping chamber (36) defined within the body portion (24), a pumping element bore (34) for receiving a pumping element (32) in use, the pumping element bore (34) extending from the pumping chamber (36) and through the turret portion (30), and a leakage return passage (74). The pump head (14) further comprises a sleeve (70) arranged around the turret portion (70) to define a leakage flow path (72) to allow fuel flow from the pumping element bore (34) to the leakage return passage (74). The pump head is suitable for use in a fuel pump of the type in which a cam drive arrangement of the pump is lubricated by engine oil, since contamination of the engine oil with fuel can be minimised.

Description

technical field [0001] The invention relates to a pump head for a pump. In particular, but not exclusively, the present invention relates to a pump head for a high pressure fuel pump assembly of the type in which the fuel to be pumped is isolated from the transmission of the fuel pump assembly. Background technique [0002] In modern common rail fuel injection systems, especially diesel fuel injection systems, it is desirable to provide fuel to the fuel injectors at very high pressures. [0003] One known type of fuel pump assembly suitable for supplying fuel at high pressure to a common rail comprises at least one pumping element or pumping plunger driven by means of a cam drive so that The fuel inside the pumping chamber is pressurized for delivery to the common rail. [0004] The cam drive includes an eccentric cam surface rotatable by means of a drive shaft. Rotation of the cam surface is converted to reciprocating linear motion of the plunger via an intermediate tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/10F02M59/44F04B1/04
CPCF04B53/162F04B1/0421F02M59/102F04B1/0439F04B1/0448F02M59/442F02M59/06F02M59/10F02M59/44F04B1/04F02M21/0245
Inventor C.麦克林德勒
Owner DELPHI INT OPERATIONS LUXEMBOURG S A R L