GB2582013A - Fuel injector valve seat arrangement - Google Patents

Fuel injector valve seat arrangement Download PDF

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Publication number
GB2582013A
GB2582013A GB1903131.9A GB201903131A GB2582013A GB 2582013 A GB2582013 A GB 2582013A GB 201903131 A GB201903131 A GB 201903131A GB 2582013 A GB2582013 A GB 2582013A
Authority
GB
United Kingdom
Prior art keywords
valve seat
lower housing
tip
seat component
fuel injector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1903131.9A
Other versions
GB201903131D0 (en
Inventor
Sauvage Frédéric
Legrand Philippe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi Technologies IP Ltd
Original Assignee
Delphi Technologies IP Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delphi Technologies IP Ltd filed Critical Delphi Technologies IP Ltd
Priority to GB1903131.9A priority Critical patent/GB2582013A/en
Publication of GB201903131D0 publication Critical patent/GB201903131D0/en
Publication of GB2582013A publication Critical patent/GB2582013A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto

Abstract

A fuel injector (1, Fig. 1a) including an elongate lower housing 5 adapted to house a valve needle (4, Fig. 1a), said housing 5 formed as an elongated sleeve, and including a valve seat component 20 connected thereto, wherein said valve needle (4, Fig. 1a) is adapted to reciprocate along a central axis such that the tip of the needle engages and disengages to and from a valve seat surface 8 of said valve seat component 20 to selectively allow fuel injection, and wherein the valve seat component 20 has a connection portion in the form of a sleeve portion 21 wherein the distal tip portion of the lower body 5 is formed/arranged as an insert into the sleeve portion 21 of the seat component 20. The arrangement allows for diameter reduction of the injector, lowering its cost.

Description

FUEL INJECTOR VALVE SEAT ARRANGEMENT
TECHNICAL FIELD
This invention relates to fuel injectors and has particular but not exclusive application fuel injectors for engines with gasoline direct injection (GDi).
BACKGROUND OF THE INVENTION
A GDi injector is a very challenging product where product performance is a driver in the design but moreover the product cost is a fundamental element to gaining market share.
A current trend for GDI injectors is to reduce the lower housing diameter and the seat external diameter.
It is one object of the invention to get the benefit of the lower housing and seat external diameter reduction of injectors to lower the cost of the injector.
SUMMARY OF THE INVENTION
In one aspect is provided a fuel injector including an elongate lower housing adapted to house a valve needle, said housing formed as an elongated sleeve, and including a valve seat component connected thereto, wherein said valve needle is adapted to reciprocate along a central axis such that the tip of the needle engages and disengages to and from a valve seat surface of said valve seat component to seletively allow fuel injection, and wherein the valve seat component has a connection portion in the form of a sleeve portion wherein the tip (distal end) portion of the lower body is formed/arranged as an insert into the sleeve portion of the seat component The internal and/or external diameters of the lower housing at the distal tip thereof is the same as the internal and/or external diameters of the distal portion thereof.
The outer circumference of the distal end (tip) of the lower housing may provide a fit and or seal with the internal circumference of the sleeve portion of the valve seat component.
The valve seat component n and the tip of the lower housing may be re press fitted together.
The fuel injector may include a tip seal is located circumferentially around the distal end of the lower housing such that the distal end of the seal abuts against the upper surface of the sleeve.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which: Figure la shows a known design of fuel injector; Figure lb shows the distal portion of the fuel injector of figure lb in more detail; Figure 2 shows an example of the invention
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figure 1 a shows a known design of fuel injector. A solenoid actuator 2 is located in an upper housing 3. The solenoid actuaor acts along with biasing spring means, to move a pintle /needle 4 up and down within the injector. The distal portion of the needle is located in an injector body,# often referred to as a lower housing portion 5. The lower portion of the injector bounded by the box in figure la is shown in greater detail in figure lb. The distal tip of the needle may be formed having a curved distal surface and so the needle tip 6 may be generally ball shaped, Located at and within the distal end of the lower housing is a valve seat (component) 7. The tip of the needle engages and disengages with the upper surface 8 of the valve seat as it moves up and down to block fuel flow or to allow fuel flow to discahrcge into a compbusting space via orifices 9 as is well known in the art.
A circumferential tip seal 10 is located towards the distal end of the lower housing exterior thereto.
The lower housing or body in generally formed as a hollow cylinder in which the needle is located and fuel flows in the cylindrical space between the needle and the body. In the design shown, at the distal end of the lower body housing is formed a recess 12 from a widened sleeve portion 13 and an internal neck/shoulder portion 11. This geometry at the distal end of the lower housing allow a generally cylindrical valve seat (component) 7 to be inserted into the distal end. The top portion of the seat i.e. the end which is inserted into the recess, also comprises a sleeve portion 14 which is inserted into the widened sleeve portion 13 formed in the distal tip of the lower housing; thus the outer circumference of the seat sleeve 14 provides a fit/seal with the internal circumference of the lower housing distal portion formed from as a widened sleeve.
Figure 2 shows an example of the invention and again shows the distal end of the lower housing 5 with valve seat arrangement. Here the distal tip of the lower body does not have a widened portion as in the prior art but the diameter of the sleeve forming the distal portion of the lower housing is the same at the tip In contrast to the figure 1 design, here the distal end of the lower housing (injector body) 5 is inserted (formed as an insert) into a sleeve portion 21 formed in the upper portion of a valve seat component 20 (the portion or end of the valve set that connects with the lower housing body) ; thus the outer circumference of the distal end (tip) of the lower housing sleeve provides a fit with the internal circumference of the sleeve portion of the valve seat.
Thus, the design benefits from a lower housing and seat external diameter reduction to lower the cost of the injector. The tip of the lower housing does not need to have the neck and shoulder portion manufactured.
So, in examples the seat is press fitted to the lower housing by its internal diameter rather than its external diameter. Current fuel injector have the seat and lower housing stepped diameters for press fit seat in Lower Housing but in examples there is effectively an inversed press fit Lower Housing in Seat design.
The design and operation of the whole injector stays the same as a conventional GDi injector except the seat and lower housing design.
The seat design for ball sealing and micro-holes for dispensing fuel remain the same. In examples the seat outer diameter may remain the same but is now a single diameter with no steps. The lower housing internal diameter may remain the same in the seat region. The seat and lower housing press fitting mean diameter may be the same, relative press fit parts is inversed: now lower housing outside diameter fits inside the seat internal diameter.
The main advantages of the invention are that a single outer diameter of seat allows a cost reduction for machining, Single outer diameter of seat can facilitate a deep drawn / cold forming process of the complete seat (one single outside diameter is easier for such process with better concentricity between ball and housing guides), The same state of the art seat larger outer diameter is kept as an engine mounting interface required by customers.
The seal may be located axially by the upper face and the seat and the lower face of the body. This enabes the seal to be located more distally (lower down) seal close to the combustion chamber and improve the cooling.
The single inner diameter of lower housing allows a cost reduction for machining, the single inner diameter of the lower housing facilitates a deep drawn / cold forming process of the lower housing (when dissociated from the body). The upper face of seat can become the bottom for a low tip seal resulting in a simpler lower housing shape. The lower tip seal position may reduce heat propagation.
The design simplifies the stack-up of seat and lower housing assembly to minimize pintle and ball centering to seat, reducing performance spread part to part. A resultant seat with higher strength material surrounding lower housing with a weaker material should improve pressure fatigue resistance of the weld for similar thickness.
There is no impact on other components design, on hydraulic volume and hence complete performance.
In one example the circumferential tip seal may be located circumferentially around the distal end of the lower housing (injector body) 5 (just up from the valve seat component) such that the distal end of the seal abuts against the upper surface of the sleeve portion. In other words the tip seal is located axially by the upper face and the seat and the lower face of the body Additional advantages. that the end of the seat can be used as a stopper for the tip seal; this simplifies the manufacturing process, and there is thus no need to enlarge the tip seal for assembly above the seat, seat being assembled afterwards. No longer are there risks for tip seal damage when today the reduction diameter after assembly over seat can generate buns and damage of tip seal.

Claims (5)

  1. CLAIMS1 A fuel injector including an elongate lower housing adapted to house a valve needle, said housing formed as an elongated sleeve, and including a valve seat component connected thereto, wherein said valve needle is adapted to reciprocate along a central axis such that the tip of the needle engages and disengages to and from a valve seat surface of said valve seat component to seletively allow fuel injection, and wherein the valve seat component has a connection portion in the form of a sleeve portion wherein the tip (distal end) portion of the lower body is formed/arranged as an insert into the sleeve portion of the seat component.
  2. 2. A fuel injector as claimed in claim I wherein the internal and/or external diameters of the lower housing at the distal tip thereof is the same as the internal and/or external diameters of the distal portion thereof.
  3. A fuel injector as claimed in claims 1 or 2 where the outer circumference of the distal end (tip) of the lower housing provides a fit and or seal with the internal circumference of the sleeve portion of the valve seat component.
  4. 4. A fuel injector as claimed in claims 1 to 3 wherein valve seat component and the tip of the lower housing are press fitted together.
  5. 5. A fuel injector as claimed in claims Ito 4 including a tip seal (10) is located circumferentially around the distal end of the lower housing 5 such that the distal end of the seal abuts against the upper surface of the sleeve
GB1903131.9A 2019-03-08 2019-03-08 Fuel injector valve seat arrangement Withdrawn GB2582013A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1903131.9A GB2582013A (en) 2019-03-08 2019-03-08 Fuel injector valve seat arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1903131.9A GB2582013A (en) 2019-03-08 2019-03-08 Fuel injector valve seat arrangement

Publications (2)

Publication Number Publication Date
GB201903131D0 GB201903131D0 (en) 2019-04-24
GB2582013A true GB2582013A (en) 2020-09-09

Family

ID=66380463

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1903131.9A Withdrawn GB2582013A (en) 2019-03-08 2019-03-08 Fuel injector valve seat arrangement

Country Status (1)

Country Link
GB (1) GB2582013A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6123275A (en) * 1999-08-12 2000-09-26 Delphi Technologies, Inc. Dual gap fuel injector
KR20170072011A (en) * 2015-12-16 2017-06-26 주식회사 현대케피코 Injector having an elastic plate

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6123275A (en) * 1999-08-12 2000-09-26 Delphi Technologies, Inc. Dual gap fuel injector
KR20170072011A (en) * 2015-12-16 2017-06-26 주식회사 현대케피코 Injector having an elastic plate

Also Published As

Publication number Publication date
GB201903131D0 (en) 2019-04-24

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)