Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Seam test on a fuel injection pump, and fuel injection pump required for applying same

An inspection method and technology of fuel injection pumps, applied to fuel injection pumps, liquid tightness measurement using liquid/vacuum degree, fuel injection devices, etc., can solve problems such as hindering inspections, short circuits, etc., and achieve the effect of increasing installation costs

Inactive Publication Date: 2002-05-15
ROBERT BOSCH GMBH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, during the tightness test, the problem arises that, inside the pump housing, a hydraulic short circuit occurs between the inlet and the outlet at least via a throttle connection, so that the above-mentioned sealing ring can only be partially isolated Check, check the outer sealing ring, the above-mentioned first sealing ring and the third sealing ring have no major problems, however, due to the hydraulic short circuit, the second sealing ring used as the seal between the first annular cavity and the second annular cavity There is a problem with the inspection
It is difficult, especially when the fuel injection pump is finally inserted into the engine housing, that it should be possible to test this seal, however, for example through a throttle gap at the fuel injection pump piston or oil leakage through a throttled cooling circuit would interfere with this test

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Seam test on a fuel injection pump, and fuel injection pump required for applying same
  • Seam test on a fuel injection pump, and fuel injection pump required for applying same
  • Seam test on a fuel injection pump, and fuel injection pump required for applying same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The fuel injection pump shown in FIG. 1 is a so-called pump nozzle 1 which is inserted into a receptacle 2 in a motor housing 3 . This type of oil pump nozzle has a pump piston 5, which is driven to and fro by a driving device of the engine itself. The pump piston surrounds a pump working chamber 7 in a cylinder bore 6 , from which fuel is supplied via a pressure line 9 to the fuel injection valve 10 when the pump piston moves against the force of a restoring spring 8 . The pump piston, the pump working chamber and the fuel injection valve are located in a common housing 11 consisting of housing parts screwed together. The fuel pump nozzle is characterized by the shortest possible connection between the pump working chamber 7 and the injection point of the fuel injector 10, where the connecting fuel line 9 is guided in a dimensionally stable housing instead of a Normally elastically deformable fuel hose, this hose affects fuel injection due to its displacement.

[001...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A process for leak testing in fuel injection pumps that have a pump housing that can be plugged into a motor housing, in which an outlet of the fuel injection pump, which feeds into an annular chamber that is divided by sealing rings and is normally discharged by way of a line, is closed with a material in order to carry out a leak test. The material is plastically deformable and dissolves with the heating of the fuel, and due to its plasticity, produces a sealed closure of the annular chamber in relation to the interior of the fuel injection pump so that the annular chamber can be loaded with a testing pressure via the line.

Description

technical field [0001] The invention relates to a fuel injection pump leak test method and a fuel injection pump implementing the method. The fuel injection pump has a pump casing that can be inserted into the engine casing, and the pump casing is contained by a fuel injection pump housing in the engine casing. On the shell surface surrounded by the wall of the fuel injection pump, there is an inlet for feeding fuel into the working chamber of the fuel injection pump and an outlet for returning fuel. This outlet leads to a first annular chamber, which is connected to the outside through a pump housing. A first sealing ring clamped between the outer surface of the pump housing and the wall of the housing is sealed against the inlet by a second sealing ring clamped between the outer surface of the pump housing and the wall of the housing, from a second The fuel supply to the inlet is carried out by an annular chamber, the second annular chamber being arranged between the outer s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F02M39/00F02M55/00F02M57/02F02M59/36F02M59/44F02M65/00G01M3/28
CPCF02M59/366F02M57/02F02M65/006F02M65/00F02M55/00F02M39/00
Inventor 迪尔克·塞德勒迪特尔·沙伊布勒维托·特里卡西
Owner ROBERT BOSCH GMBH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products