WO2021140106A1 - Kit for installing a tip seal on a nose of a gdi fuel injector - Google Patents

Kit for installing a tip seal on a nose of a gdi fuel injector Download PDF

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Publication number
WO2021140106A1
WO2021140106A1 PCT/EP2021/050101 EP2021050101W WO2021140106A1 WO 2021140106 A1 WO2021140106 A1 WO 2021140106A1 EP 2021050101 W EP2021050101 W EP 2021050101W WO 2021140106 A1 WO2021140106 A1 WO 2021140106A1
Authority
WO
WIPO (PCT)
Prior art keywords
tip seal
mounting cone
nose
fuel injector
pusher
Prior art date
Application number
PCT/EP2021/050101
Other languages
French (fr)
Inventor
Cyrille CORBOEUF
Guillaume FABER
Original Assignee
Delphi Technologies Ip Limited
Delphi France Sas
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 Limited, Delphi France Sas filed Critical Delphi Technologies Ip Limited
Priority to EP21700256.7A priority Critical patent/EP4088018A1/en
Publication of WO2021140106A1 publication Critical patent/WO2021140106A1/en

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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/0028—Tools for removing or installing seals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/0035—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for motor-vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials

Definitions

  • the present invention relates to a kit for installing a tip seal on a nose of a GDI fuel injector, as well as to a method for installing the tip seal on the nose of the GDI fuel injector.
  • a GDI fuel injector injects fuel under high pressure directly into a combustion chamber placed inside a cylinder.
  • the GDI fuel injector is mounted near an air intake valve, into a cylinder’s hole placed on a cylinder’s head or on a cylinder’s lateral wall.
  • fuel is directly received inside the combustion chamber.
  • a gap remaining between the GDI fuel injector and an inner wall of the cylinder’s hole is classically filled with a tip seal arranged around a portion of a nose of the GDI fuel injector.
  • the tip seal allows holding back the high pressures and the high temperatures that exist inside the combustion chamber, so that they are retained in the combustion chamber. Thus, a damage of other elements in the vehicle fuel engine is avoided.
  • the tip seal has therefore an essential role in the functioning of the fuel engine, a correct installation of the tip seal around the nose of the GDI fuel injector being necessary.
  • GDI gasoline direct-injection
  • the tip seal when the tip seal is placed around the at least one mounting cone, the tip seal is pushed by the tip seal pusher to a final position in which the tip seal must be installed. Hence, the risk of inaccuracy or error while positioning the tip seal around the nose of the GDI fuel injector is drastically reduced.
  • the kit comprises a first mounting cone and a second mounting cone, the first mounting cone receiving a first tip seal around an outer surface, the second mounting cone receiving a second tip seal around an outer surface, a length of the first mounting cone being longer than a length of the second mounting cone.
  • a section of a first end of the first mounting cone is substantially equal to a section of a first end of the second mounting cone, and a section of a second end of the first mounting cone is substantially equal to a section of a second end of the second mounting cone.
  • the invention further extends to a mounting cone of the kit as previously described, the mounting cone comprising an outer surface configured to receive a tip seal, the mounting cone having a length such that the tip seal is placed in a final position on the GDI fuel injector when a first end of the mounting cone contacts a first end of the nose of the GDI fuel injector and a second end of the mounting cone contacts a cap inserted in the tip seal pusher.
  • the invention further extends to a tip seal pusher of the kit as previously described, the tip seal pusher comprising a front face and a rear face, the front face comprising a first hole adapted to receive the mounting cone having a tip seal on an outer surface, the rear face comprising a second hole, the second hole being adapted to receive a cap.
  • the first hole is sized such that the front face of the tip seal pusher pushes the tip seal along the outer surface of the mounting cone when the mounting cone is received in the first hole.
  • the tip seal pusher comprises a longitudinal cavity extending between the first hole and the second hole.
  • the invention further extends to a tip seal fitting cylinder of the kit as previously described, the tip seal fitting cylinder comprising a longitudinal cavity adapted to receive the nose of the GDI fuel injector, the longitudinal cavity being shaped to adapt a diameter of at least one tip seal installed on the nose of the GDI fuel injector.
  • the longitudinal cavity comprises a first portion and a second portion, the first portion having a substantially frustoconical shape, the second portion having a substantially cylindrical shape, a diameter of the second portion being substantially equal to a diameter of the nose of the GDI fuel injector.
  • the invention further extends to a method for installing a first tip seal and a second tip seal on a nose of a GDI fuel injector by means of a first and a second mounting cones as previously described, the tip seal pusher as previously described and the tip seal fitting cylinder as previously described, a length of the second mounting cone being shorter than a length of the first mounting cone, the method comprising the following steps for installing said first tip seal: a) placing the first tip seal around the outer surface of the first mounting cone; b) partially inserting the first mounting cone in the first hole of the tip seal pusher; c) establishing a contact between the first end of the first mounting cone and the first end of the nose of the GDI fuel injector; d) pushing the first tip seal along the outer surface of the first mounting cone by applying a force on the tip seal pusher until the second end of the first mounting cone contacts the cap in the tip seal pusher, the force being substantially parallel to a longitudinal axis of the first mounting cone; e) extracting the nose of the GDI
  • the method as previously described further comprises the following steps for installing the second tip seal (19): a) placing the second tip seal around the outer surface of the second mounting cone; b) partially inserting the second mounting cone in the first hole of the tip seal pusher; c) establishing a contact between the first end of the second mounting cone and the first end of the nose of the GDI fuel injector; d) pushing the second tip seal along the outer surface of the second mounting cone by applying a force on the tip seal pusher until the second end of the second mounting cone contacts the cap on the tip seal pusher, the force being substantially parallel to a longitudinal axis of the second mounting cone; e) extracting the nose of the GDI fuel injector from the tip seal pusher; f) inserting the nose of the GDI fuel injector in the tip seal fitting cylinder; g) applying a rotational movement to the tip seal fitting cylinder; and h) extracting the nose of the GDI fuel injector from the tip seal fitting cylinder.
  • Figure 1 shows a perspective view of a GDI fuel injector in a first configuration.
  • Figure 2 shows a perspective view of the GDI fuel injector of figure 1 in a second configuration.
  • Figure 3 shows a schematic front view of a mounting cone as per the present invention.
  • Figure 4 shows a schematic front view of a tip seal pusher as per the present invention.
  • Figure 5 shows a schematic longitudinal section of the tip seal pusher of figure 4.
  • Figure 6 shows a perspective view of the tip seal pusher of figure 4.
  • Figure 7 shows a schematic longitudinal view of a cap for the tip seal pusher of figure 4.
  • Figure 8 shows a schematic front view of a tip seal fitting cylinder as per the present invention.
  • Figure 9 shows a schematic longitudinal section of the tip seal fitting cylinder of figure 8.
  • Figure 10 shows a nose of the GDI fuel injector in contact with the mounting cone of figure 3, the mounting cone being inserted in the tip seal pusher of figure 4.
  • Figure 11 shows the nose of the GDI fuel injector of figure 1 inserted in the tip seal fitting cylinder of figure 8.
  • a GDI fuel injector 10 comprises a body 12 and a nose 14.
  • the nose 14 extends from the body 12, forming an end of the GDI fuel injector 10.
  • the body 12 and the nose 14 have a substantially cylindrical shape, a section of the body 12 being larger than a section of the nose 14.
  • the nose 14 is hollow.
  • the nose 14 comprises at least one slot 16 disposed over an external surface 15 of the nose 14.
  • a diameter dl of the nose 14 at the level of the at least one slot 16 is therefore smaller than a diameter d2 of the nose 14.
  • the at least one slot 16 is shaped to be covered by a tip seal 18.
  • the at least one slot 16 has an annular shape, extending along a whole perimeter of a portion of the nose 14.
  • the nose 14 comprises one or two slots 16, each slot 16 being covered by a tip seal 18.
  • the GDI fuel injector 10 comprises two slots 16, such that a first tip seal 18 and a second tip seal 19 are installed around the nose 14.
  • the first and the second tip seals 18, 19 are identical. As shown in figure 2, the tip seals 18, 19 have an annular shape.
  • the tip seals 18, 19 are made of an elastic or deformable material, such that an internal diameter of the tip seals 18, 19 can be adapted to the diameter dl of the nose 14 at the level of the at least one slot 16.
  • the tip seal 18, 19 can be made of nitrile having a hardness of 70 shore.
  • the present invention relates to a kit for installing the tip seals 18, 19 on the nose 14 of the fuel injector 10.
  • the kit is going to be described in relation to the first tip seal 18, but the same is applicable to the second tip seal 19.
  • the kit comprises at least one between a tip seal pusher 30, or a tip seal fitting cylinder 50 or at least one mounting cone 20.
  • the kit comprises at least one mounting cone 20, the tip seal pusher 30 and the tip seal fitting cylinder 50.
  • Figure 3 shows the mounting cone 20 for installing the tip seal 18.
  • the mounting cone 20 has a substantially frustoconical shape, a section of a first end 22 of the mounting cone 20 being larger than a section of a second end 24.
  • the section of the first end 22 is between 35% and 45% larger than the section of the second end 24, more preferably between 38% and 42%.
  • the mounting cone 20 has an outer surface 26 adapted to receive the tip seal 18.
  • the tip seal 18 is in particular received by the second end 24 of the mounting cone 20.
  • the outer surface 26 of the mounting cone 20 is substantially smooth.
  • the first end 22 of the mounting cone 20 is hollow.
  • a hollow 28 arranged in the first end 22 is shaped such that a first end of the nose 14 of the fuel injector 10 can be inserted in the hollow 28.
  • the hollow 28 is a blind slot having a substantially conical shape.
  • a base of the hollow 28 corresponds to the first end 22.
  • the base of the hollow 28 has an internal diameter d3 and an external diameter d4.
  • the internal diameter d3 is smaller than the diameter d2 of the nose 14, while the external diameter d4 is equal or larger than the diameter d2 of the nose 14.
  • the external diameter d4 of the hollow 28 is between 1% and 2% larger than the diameter d2 of the nose 14.
  • a length L of the mounting cone 20 is selected such that when the second end 24 of the mounting cone 20 contacts a cap 39 inserted in the tip seal pusher 30, the tip seal 18 is placed at the level of the slot 16 in which the tip seal 18 must be installed.
  • the cap 39 will be described later.
  • a length LI of the first end 24 and a length L2 of the second end are preferably equal.
  • the length LI and the length L2 are comprised in a range from 2% to 15% of the length L of the mounting cone 20, preferably from 5% to 10% of the length L of the mounting cone 20.
  • a section of the mounting cone 20 between the first end 22 and the second end 24 gradually decreases.
  • the mounting cone 20 is made of a metallic material, in particular aluminium.
  • FIG. 4 shows the tip seal pusher 30 for installing the tip seal 18 on the nose 14 of the GDI fuel injector 10.
  • the tip seal pusher 30 has a substantially cylindrical shape extending along a longitudinal direction B of the tip seal pusher 30.
  • the tip seal pusher 30 extends from a front face 36 to a rear face 37.
  • the tip seal pusher 30 comprises three portions extending along the longitudinal direction B, namely a first portion 31 and a second portion 32, the first portion 31 and the second portion 32 being joined between them by a third portion 33.
  • the first portion 31, the second portion 32 and the third portion 33 have a substantially cylindrical shape.
  • An outer surface of the second portion 32 can be partially or totally rough, while an outer surface of the first portion 31 and an outer surface of the third portion 33 are preferably smooth.
  • a section S3 of the first portion 31 is substantially equal to a section S4 of the second portion 32.
  • a section S5 of the third portion 33 is smaller than the section S3 of the first portion 31 and than the section S4 of the second portion 32.
  • the section S5 is between 20% and 30% smaller than the sections S3, S4 of the first and the second portions 31, 32, preferably between 23% and 27% smaller.
  • the front face 36 comprises a first hole 35.
  • the first hole 35 is placed at a centre of the front face 36.
  • the first hole 35 has preferably a circular section.
  • the rear face 37 comprises a second hole 44.
  • the second hole 44 is placed at a center of the rear face 37.
  • the second hole 44 has advantageously a circular section.
  • a diameter d6 of the second hole 44 is larger than a diameter d5 of the first hole 35.
  • the diameter d6 of the second hole 44 is between 45% to 55% larger than the diameter d5 of the first end, preferably between 48% to 52% larger.
  • a cavity 38 extends from the first hole 35 to the second hole 44.
  • the cavity 38 extends inside the tip seal pusher 30 along the longitudinal direction B, between the first hole 35 and the second hole 44.
  • the cavity 38 has advantageously a circular section.
  • a diameter d7 of the cavity is substantially equal to the diameter d6 of the second hole 44.
  • At least one groove 34 extends along the first portion 31 and the third portion 33 in a longitudinal direction B of the tip seal pusher 30.
  • the tip seal pusher 30 comprises three grooves 34 angularly distributed along a surface of the first portion 31 and the third portion 33.
  • two consecutive grooves 34 form an angle between them substantially equal to 120°.
  • the three grooves 34 intersect in the first hole 35.
  • the grooves 34 allow the diameter d5 of the first hole 35 to radially expand when a force is applied to the first hole 35 in a radial direction of said first hole 35.
  • the first hole 35 is adapted to receive the mounting cone 20 when the tip seal 18 is positioned around the outer surface 26.
  • the diameter d5 of the first hole 35 is larger than a diameter of the second end 24 of the mounting cone 20.
  • the diameter d5 of the first hole 35 is between 20% and 30% larger than the diameter of the second end 24 of the mounting cone 20.
  • the diameter d5 of the first hole 35 is between 23% and 27% larger than the diameter of the second end 24 of the mounting cone 20.
  • the diameter d5 of the first hole 35 is nevertheless smaller than a sum of the diameter of the second end 24 of the mounting cone 20 and a thickness of the tip seal 18.
  • the second hole 44 is adapted to receive a cap 39.
  • the cap 39 has a main body 40 and a base 41.
  • the main body 40 comprises a first portion 42 and a second portion 43 extending along a longitudinal direction C.
  • the first portion 42 has a substantially cylindrical shape, while the second portion 43 has a substantially hemi-spherical shape.
  • a diameter of the first portion 42 is equal to a diameter of the second portion 43.
  • the diameter of the first portion 42 and the diameter of the second portion 43 are equal or smaller to the diameter d7 of the cavity 38 and the diameter d6 of the second hole 44. Therefore, the cap 39 can be inserted inside the cavity 38 by the second hole 44.
  • the diameter of the first portion 42 and the diameter of the second portion 43 are substantially equal to the diameter d7 of the cavity 38 and the diameter d6 of the second hole 44.
  • a length L4 of the main body 40 is equal or shorter than a length L3 of the second portion 32 of the tip seal pusher 30.
  • the base 41 extends in a direction substantially perpendicular to the longitudinal direction C of the main body 40 of the cap 39.
  • the base 41 is in particular adapted to contact the rear face 37 of the tip seal pusher 30 when the cap 39 is totally inserted in the cavity 38.
  • the tip seal pusher 30 and the cap 39 are made of a polymeric material.
  • the tip seal pusher 30 is made of polyamide 6 (PA6), commonly known under the name of nylon 6.
  • Figure 8 shows the tip seal fitting cylinder 50 for installing the tip seal 18 on the nose 14 of the GDI fuel injector 10.
  • the fitting cylinder 50 allows adapting a diameter of the tip seal 18 installed on the nose 14, to the diameter dl of the nose 14.
  • the fitting cylinder 50 comprises an outer surface comprising a rough portion 52 placed between two smooth portions 54.
  • the fitting cylinder 50 is hollow, comprising a cavity 56 extending along a longitudinal direction D of the fitting cylinder 50, between a first end and a second end of the fitting cylinder 50.
  • the cavity 56 comprises a first portion 57 and a second portion 58.
  • the first portion 57 has a substantially frustoconical shape.
  • the second portion 58 has a substantially cylindrical shape.
  • a length L5 of the first portion 57 is shorter than a length L6 of the second portion 58.
  • the length L5 of the first portion 57 is between 40% and 50% shorter than the length L6 of the second portion 58.
  • a diameter d8 of a first end of the first portion 57 of the cavity 56 is larger than a diameter d9 of a second end of the first portion 57.
  • the diameter d9 of the second end of the first portion 57 is substantially equal to a diameter dlO of the second portion 58.
  • the diameter d9 of the second end of the first portion 57 and the diameter dlO of the second portion 58 are substantially equal to the diameter d2 of the nose 14. Therefore, the nose 14 of the GDI fuel injector 10 can be inserted inside the cavity 56 of the fitting cylinder 50.
  • the fitting cylinder 50 further comprises a seal 59 arranged at an end of the second portion 58.
  • the seal 59 protects the nose 14 when the nose 14 is inside the cavity 56.
  • the fitting cylinder 50 is made of a metallic material, in particular aluminium.
  • the tip seal 18 is placed around the outer surface 26 of the first mounting cone 20 at the second end 24 of the mounting cone 20.
  • the first mounting cone 20 is introduced inside the tip seal pusher 30 such that the direction A of the first mounting cone coincides with the direction of the tip seal pusher 30.
  • the second end 24 is inserted in the first hole 35.
  • the contact between the tip seal 18 and the front face 36 of the tip seal pusher 30 provokes a displacement of the tip seal 18 along the outer surface 26 towards the first end 22 of the first mounting cone 20.
  • the first end 22 of the first mounting cone 20 and the first end of the nose 14 are put in contact, which advantageously provokes a portion of the first end of the nose 14 to be inserted in the hollow 28.
  • a force substantially parallel to a longitudinal direction A of the first mounting cone is applied to the tip seal pusher 30.
  • the force provokes a displacement of the tip seal pusher 30 along the longitudinal direction A of the first mounting cone 20, inducing the displacement of the tip seal 18 along the outer surface 26 of the first mounting cone in the direction of the first end 22 because of the contact between the tip seal 18 and the front face 36.
  • the diameter d5 of the first hole 35 increases gradually, such that the diameter d5 is substantially equal to a diameter of the first mounting cone 20 at every moment.
  • the pushing of the tip seal 18 by the force applied to the tip seal pusher 30 is finished when the second end 24 contacts the cap 39.
  • the length L of the first mounting cone is chosen such that when the second end 24 of the first mounting cone 20 contacts the cap 39, the tip seal 18 is placed in a final position in which the tip seal 18 must be installed.
  • the first mounting cone 20 is integrally inside the cavity 38.
  • the cap 39 is then removed from the cavity 38 to extract the first mounting cone 20 from the cavity 38.
  • the method also comprises a step for extracting the nose 14 of the GDI fuel injector 10 from the tip seal pusher 30.
  • the nose 14 is inserted in the cavity 56 of the tip seal fitting cylinder 50 in order to adapt the internal diameter of the tip seal 18 to the diameter dl of the nose 14 at the level of the slot 16.
  • the longitudinal direction D and the longitudinal direction L are coincident when the nose 14 is inserted in the cavity 56.
  • Adapting the internal diameter of the tip seal 18 to the diameter dl is possible by applying a rotational movement along the longitudinal direction D to the tip seal fitting cylinder 50. Since the diameter dlO of the second portion 58 of the tip seal fitting cylinder 50 is substantially equal to the diameter d2 of the nose 14, the rotational movement applied to the fitting cylinder 50 further provokes that an external diameter of the tip seal 18 is substantially equal to the diameter d2 of the nose 14.
  • the same steps are applied in order to install the second tip seal 19 on the nose 14, but in this case the second mounting cone 20 is employed instead of the first mounting cone 20.
  • the first and the second mounting cones 20 differ in length.
  • the second mounting cone 20 is shorter than the first mounting cone 20.
  • a section of a first end 22 of the first mounting cone 20 is substantially equal to a section of a first end 22 of the second mounting cone 20
  • a section of a second end 24 of the first mounting cone 20 is substantially equal to a section of a second end 24 of the second mounting cone 20.
  • the GDI fuel injector 10 comprises a plurality of slots 16 for installing a tip seal therein
  • a plurality of mounting cones 20 is employed. The method previously described is then applied separately for each mounting cone 20 of the plurality of mounting cones 20.
  • Each mounting cone 20 of the plurality of cones has a length adapted such that when the second end 24 of each mounting cone 20 and the cap 39 are in contact, the tip seal associated to each mounting cone 20 is placed at the level of the slot 16 in which said tip seal must be installed.
  • the method previously described is firstly applied with the mounting cone having a shorter length L. Consequently, the first tip seal 18 installed on the nose 14, is the tip seal positioned closer from the main body 12 of the GDI fuel injector 10.
  • the invention is not limited to the illustrated embodiments and method.
  • the first tip seal 18 to be installed can be the tip seal associated to the longest mounting cone 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A kit for installing a tip seal (18,19) on a nose (14) of a gasoline direct-injection (GDI) fuel injector (10), the nose having a substantially cylindrical shape and comprising at least one slot shaped to be covered by the tip seal (18,19), the tip seal (18,19) being deformable, the kit comprising at least one between: • - at least one mounting cone (20); or • - a tip seal pusher (30); or • - a tip seal fitting cylinder (50).

Description

KIT FOR INSTALLING A TIP SEAL ON A NOSE OF A GDI FUEL INJECTOR
TECHNICAL FIELD
The present invention relates to a kit for installing a tip seal on a nose of a GDI fuel injector, as well as to a method for installing the tip seal on the nose of the GDI fuel injector.
BACKGROUND OF THE INVENTION
It is known that in a gasoline direct-injection (GDI) system of a vehicle fuel engine, a GDI fuel injector injects fuel under high pressure directly into a combustion chamber placed inside a cylinder. Generally, the GDI fuel injector is mounted near an air intake valve, into a cylinder’s hole placed on a cylinder’s head or on a cylinder’s lateral wall. Thus, fuel is directly received inside the combustion chamber.
A gap remaining between the GDI fuel injector and an inner wall of the cylinder’s hole is classically filled with a tip seal arranged around a portion of a nose of the GDI fuel injector.
The tip seal allows holding back the high pressures and the high temperatures that exist inside the combustion chamber, so that they are retained in the combustion chamber. Thus, a damage of other elements in the vehicle fuel engine is avoided. The tip seal has therefore an essential role in the functioning of the fuel engine, a correct installation of the tip seal around the nose of the GDI fuel injector being necessary.
Nevertheless, the tools currently available for installing the tip seal are not satisfactory or accurate in order to install the tip seal directly on a correct position around the nose of the GDI fuel injector.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to resolve the above- mentioned problem in providing a kit for installing a tip seal on a nose of a gasoline direct-injection (GDI) fuel injector, the nose having a substantially cylindrical shape and comprising at least one slot shaped to be covered by the tip seal, the tip seal being deformable, the kit comprising at least one between:
- at least one mounting cone; or
- a tip seal pusher; or
- a tip seal fitting cylinder.
Thanks to the claimed kit, when the tip seal is placed around the at least one mounting cone, the tip seal is pushed by the tip seal pusher to a final position in which the tip seal must be installed. Hence, the risk of inaccuracy or error while positioning the tip seal around the nose of the GDI fuel injector is drastically reduced.
In an embodiment of the kit, the kit comprises a first mounting cone and a second mounting cone, the first mounting cone receiving a first tip seal around an outer surface, the second mounting cone receiving a second tip seal around an outer surface, a length of the first mounting cone being longer than a length of the second mounting cone.
In an embodiment of the kit, a section of a first end of the first mounting cone is substantially equal to a section of a first end of the second mounting cone, and a section of a second end of the first mounting cone is substantially equal to a section of a second end of the second mounting cone.
The invention further extends to a mounting cone of the kit as previously described, the mounting cone comprising an outer surface configured to receive a tip seal, the mounting cone having a length such that the tip seal is placed in a final position on the GDI fuel injector when a first end of the mounting cone contacts a first end of the nose of the GDI fuel injector and a second end of the mounting cone contacts a cap inserted in the tip seal pusher.
The invention further extends to a tip seal pusher of the kit as previously described, the tip seal pusher comprising a front face and a rear face, the front face comprising a first hole adapted to receive the mounting cone having a tip seal on an outer surface, the rear face comprising a second hole, the second hole being adapted to receive a cap.
In an embodiment of the tip seal pusher, the first hole is sized such that the front face of the tip seal pusher pushes the tip seal along the outer surface of the mounting cone when the mounting cone is received in the first hole. In an embodiment of the tip seal pusher, the tip seal pusher comprises a longitudinal cavity extending between the first hole and the second hole.
The invention further extends to a tip seal fitting cylinder of the kit as previously described, the tip seal fitting cylinder comprising a longitudinal cavity adapted to receive the nose of the GDI fuel injector, the longitudinal cavity being shaped to adapt a diameter of at least one tip seal installed on the nose of the GDI fuel injector.
In an embodiment of the tip seal fitting cylinder the longitudinal cavity comprises a first portion and a second portion, the first portion having a substantially frustoconical shape, the second portion having a substantially cylindrical shape, a diameter of the second portion being substantially equal to a diameter of the nose of the GDI fuel injector.
The invention further extends to a method for installing a first tip seal and a second tip seal on a nose of a GDI fuel injector by means of a first and a second mounting cones as previously described, the tip seal pusher as previously described and the tip seal fitting cylinder as previously described, a length of the second mounting cone being shorter than a length of the first mounting cone, the method comprising the following steps for installing said first tip seal: a) placing the first tip seal around the outer surface of the first mounting cone; b) partially inserting the first mounting cone in the first hole of the tip seal pusher; c) establishing a contact between the first end of the first mounting cone and the first end of the nose of the GDI fuel injector; d) pushing the first tip seal along the outer surface of the first mounting cone by applying a force on the tip seal pusher until the second end of the first mounting cone contacts the cap in the tip seal pusher, the force being substantially parallel to a longitudinal axis of the first mounting cone; e) extracting the nose of the GDI fuel injector from the tip seal pusher; f) inserting the nose of the GDI fuel injector in the tip seal fitting cylinder; g) applying a rotational movement to the tip seal fitting cylinder; and h) extracting the nose of the GDI fuel injector from the tip seal fitting cylinder.
The method as previously described further comprises the following steps for installing the second tip seal (19): a) placing the second tip seal around the outer surface of the second mounting cone; b) partially inserting the second mounting cone in the first hole of the tip seal pusher; c) establishing a contact between the first end of the second mounting cone and the first end of the nose of the GDI fuel injector; d) pushing the second tip seal along the outer surface of the second mounting cone by applying a force on the tip seal pusher until the second end of the second mounting cone contacts the cap on the tip seal pusher, the force being substantially parallel to a longitudinal axis of the second mounting cone; e) extracting the nose of the GDI fuel injector from the tip seal pusher; f) inserting the nose of the GDI fuel injector in the tip seal fitting cylinder; g) applying a rotational movement to the tip seal fitting cylinder; and h) extracting the nose of the GDI fuel injector from the tip seal fitting cylinder.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which: Figure 1 shows a perspective view of a GDI fuel injector in a first configuration.
Figure 2 shows a perspective view of the GDI fuel injector of figure 1 in a second configuration.
Figure 3 shows a schematic front view of a mounting cone as per the present invention.
Figure 4 shows a schematic front view of a tip seal pusher as per the present invention. Figure 5 shows a schematic longitudinal section of the tip seal pusher of figure 4.
Figure 6 shows a perspective view of the tip seal pusher of figure 4.
Figure 7 shows a schematic longitudinal view of a cap for the tip seal pusher of figure 4.
Figure 8 shows a schematic front view of a tip seal fitting cylinder as per the present invention.
Figure 9 shows a schematic longitudinal section of the tip seal fitting cylinder of figure 8.
Figure 10 shows a nose of the GDI fuel injector in contact with the mounting cone of figure 3, the mounting cone being inserted in the tip seal pusher of figure 4.
Figure 11 shows the nose of the GDI fuel injector of figure 1 inserted in the tip seal fitting cylinder of figure 8.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
As shown in figure 1, a GDI fuel injector 10 comprises a body 12 and a nose 14. The nose 14 extends from the body 12, forming an end of the GDI fuel injector 10. The body 12 and the nose 14 have a substantially cylindrical shape, a section of the body 12 being larger than a section of the nose 14. The nose 14 is hollow.
The nose 14 comprises at least one slot 16 disposed over an external surface 15 of the nose 14. A diameter dl of the nose 14 at the level of the at least one slot 16 is therefore smaller than a diameter d2 of the nose 14.
The at least one slot 16 is shaped to be covered by a tip seal 18. In particular, the at least one slot 16 has an annular shape, extending along a whole perimeter of a portion of the nose 14. Preferably, the nose 14 comprises one or two slots 16, each slot 16 being covered by a tip seal 18.
In the embodiment of figure 1, the GDI fuel injector 10 comprises two slots 16, such that a first tip seal 18 and a second tip seal 19 are installed around the nose 14.
Advantageously, the first and the second tip seals 18, 19 are identical. As shown in figure 2, the tip seals 18, 19 have an annular shape. Advantageously, the tip seals 18, 19 are made of an elastic or deformable material, such that an internal diameter of the tip seals 18, 19 can be adapted to the diameter dl of the nose 14 at the level of the at least one slot 16. For example, the tip seal 18, 19 can be made of nitrile having a hardness of 70 shore.
The present invention relates to a kit for installing the tip seals 18, 19 on the nose 14 of the fuel injector 10. Hereafter, the kit is going to be described in relation to the first tip seal 18, but the same is applicable to the second tip seal 19.
The kit comprises at least one between a tip seal pusher 30, or a tip seal fitting cylinder 50 or at least one mounting cone 20. Preferably, the kit comprises at least one mounting cone 20, the tip seal pusher 30 and the tip seal fitting cylinder 50.
Figure 3 shows the mounting cone 20 for installing the tip seal 18. The mounting cone 20 has a substantially frustoconical shape, a section of a first end 22 of the mounting cone 20 being larger than a section of a second end 24. Preferably, the section of the first end 22 is between 35% and 45% larger than the section of the second end 24, more preferably between 38% and 42%.
The mounting cone 20 has an outer surface 26 adapted to receive the tip seal 18. The tip seal 18 is in particular received by the second end 24 of the mounting cone 20. Advantageously, the outer surface 26 of the mounting cone 20 is substantially smooth.
The first end 22 of the mounting cone 20 is hollow. A hollow 28 arranged in the first end 22 is shaped such that a first end of the nose 14 of the fuel injector 10 can be inserted in the hollow 28.
The hollow 28 is a blind slot having a substantially conical shape. A base of the hollow 28 corresponds to the first end 22.
The base of the hollow 28 has an internal diameter d3 and an external diameter d4. Advantageously, the internal diameter d3 is smaller than the diameter d2 of the nose 14, while the external diameter d4 is equal or larger than the diameter d2 of the nose 14. Preferably, the external diameter d4 of the hollow 28 is between 1% and 2% larger than the diameter d2 of the nose 14.
A length L of the mounting cone 20 is selected such that when the second end 24 of the mounting cone 20 contacts a cap 39 inserted in the tip seal pusher 30, the tip seal 18 is placed at the level of the slot 16 in which the tip seal 18 must be installed. The cap 39 will be described later.
A length LI of the first end 24 and a length L2 of the second end are preferably equal. Advantageously, the length LI and the length L2 are comprised in a range from 2% to 15% of the length L of the mounting cone 20, preferably from 5% to 10% of the length L of the mounting cone 20. A section of the mounting cone 20 between the first end 22 and the second end 24 gradually decreases.
Preferably, the mounting cone 20 is made of a metallic material, in particular aluminium.
Figure 4 shows the tip seal pusher 30 for installing the tip seal 18 on the nose 14 of the GDI fuel injector 10. The tip seal pusher 30 has a substantially cylindrical shape extending along a longitudinal direction B of the tip seal pusher 30. In particular, the tip seal pusher 30 extends from a front face 36 to a rear face 37.
The tip seal pusher 30 comprises three portions extending along the longitudinal direction B, namely a first portion 31 and a second portion 32, the first portion 31 and the second portion 32 being joined between them by a third portion 33. Preferably, the first portion 31, the second portion 32 and the third portion 33 have a substantially cylindrical shape.
An outer surface of the second portion 32 can be partially or totally rough, while an outer surface of the first portion 31 and an outer surface of the third portion 33 are preferably smooth.
A section S3 of the first portion 31 is substantially equal to a section S4 of the second portion 32. A section S5 of the third portion 33 is smaller than the section S3 of the first portion 31 and than the section S4 of the second portion 32. Advantageously, the section S5 is between 20% and 30% smaller than the sections S3, S4 of the first and the second portions 31, 32, preferably between 23% and 27% smaller.
As shown in figure 5, the front face 36 comprises a first hole 35. The first hole 35 is placed at a centre of the front face 36. The first hole 35 has preferably a circular section. The rear face 37 comprises a second hole 44. Preferably, the second hole 44 is placed at a center of the rear face 37. The second hole 44 has advantageously a circular section. In figure 5, a diameter d6 of the second hole 44 is larger than a diameter d5 of the first hole 35. Advantageously, the diameter d6 of the second hole 44 is between 45% to 55% larger than the diameter d5 of the first end, preferably between 48% to 52% larger.
A cavity 38 extends from the first hole 35 to the second hole 44. In particular, the cavity 38 extends inside the tip seal pusher 30 along the longitudinal direction B, between the first hole 35 and the second hole 44. The cavity 38 has advantageously a circular section. A diameter d7 of the cavity is substantially equal to the diameter d6 of the second hole 44.
At least one groove 34 extends along the first portion 31 and the third portion 33 in a longitudinal direction B of the tip seal pusher 30. Preferably, the tip seal pusher 30 comprises three grooves 34 angularly distributed along a surface of the first portion 31 and the third portion 33. Advantageously, two consecutive grooves 34 form an angle between them substantially equal to 120°.
As clearly seen from figure 6, the three grooves 34 intersect in the first hole 35. The grooves 34 allow the diameter d5 of the first hole 35 to radially expand when a force is applied to the first hole 35 in a radial direction of said first hole 35.
The first hole 35 is adapted to receive the mounting cone 20 when the tip seal 18 is positioned around the outer surface 26. In particular, the diameter d5 of the first hole 35 is larger than a diameter of the second end 24 of the mounting cone 20. Advantageously, the diameter d5 of the first hole 35 is between 20% and 30% larger than the diameter of the second end 24 of the mounting cone 20. Preferably, the diameter d5 of the first hole 35 is between 23% and 27% larger than the diameter of the second end 24 of the mounting cone 20.
The diameter d5 of the first hole 35 is nevertheless smaller than a sum of the diameter of the second end 24 of the mounting cone 20 and a thickness of the tip seal 18. Hence, when the mounting cone 20 provided with the tip seal 18 is inserted in the hole 35, the tip seal 18 is displaced along the outer surface 26 because of a contact with the front face 36 of the tip seal pusher 30. The second hole 44 is adapted to receive a cap 39. As shown in figure 7, the cap 39 has a main body 40 and a base 41.
The main body 40 comprises a first portion 42 and a second portion 43 extending along a longitudinal direction C. The first portion 42 has a substantially cylindrical shape, while the second portion 43 has a substantially hemi-spherical shape. A diameter of the first portion 42 is equal to a diameter of the second portion 43.
Advantageously, the diameter of the first portion 42 and the diameter of the second portion 43 are equal or smaller to the diameter d7 of the cavity 38 and the diameter d6 of the second hole 44. Therefore, the cap 39 can be inserted inside the cavity 38 by the second hole 44. Preferably, the diameter of the first portion 42 and the diameter of the second portion 43 are substantially equal to the diameter d7 of the cavity 38 and the diameter d6 of the second hole 44. Advantageously, a length L4 of the main body 40 is equal or shorter than a length L3 of the second portion 32 of the tip seal pusher 30.
The base 41 extends in a direction substantially perpendicular to the longitudinal direction C of the main body 40 of the cap 39. The base 41 is in particular adapted to contact the rear face 37 of the tip seal pusher 30 when the cap 39 is totally inserted in the cavity 38.
Advantageously, the tip seal pusher 30 and the cap 39 are made of a polymeric material. In particular, the tip seal pusher 30 is made of polyamide 6 (PA6), commonly known under the name of nylon 6.
Figure 8 shows the tip seal fitting cylinder 50 for installing the tip seal 18 on the nose 14 of the GDI fuel injector 10. The fitting cylinder 50 allows adapting a diameter of the tip seal 18 installed on the nose 14, to the diameter dl of the nose 14.
The fitting cylinder 50 comprises an outer surface comprising a rough portion 52 placed between two smooth portions 54.
As shown in figure 9, the fitting cylinder 50 is hollow, comprising a cavity 56 extending along a longitudinal direction D of the fitting cylinder 50, between a first end and a second end of the fitting cylinder 50. The cavity 56 comprises a first portion 57 and a second portion 58. The first portion 57 has a substantially frustoconical shape. The second portion 58 has a substantially cylindrical shape.
A length L5 of the first portion 57 is shorter than a length L6 of the second portion 58. Advantageously, the length L5 of the first portion 57 is between 40% and 50% shorter than the length L6 of the second portion 58.
A diameter d8 of a first end of the first portion 57 of the cavity 56 is larger than a diameter d9 of a second end of the first portion 57. The diameter d9 of the second end of the first portion 57 is substantially equal to a diameter dlO of the second portion 58. Advantageously, the diameter d9 of the second end of the first portion 57 and the diameter dlO of the second portion 58 are substantially equal to the diameter d2 of the nose 14. Therefore, the nose 14 of the GDI fuel injector 10 can be inserted inside the cavity 56 of the fitting cylinder 50.
The fitting cylinder 50 further comprises a seal 59 arranged at an end of the second portion 58. The seal 59 protects the nose 14 when the nose 14 is inside the cavity 56.
Advantageously, the fitting cylinder 50 is made of a metallic material, in particular aluminium.
Now is described a method for installing the first tip seal 18 and the second tip seal 19 on the nose 14 of the GDI fuel injector 10 by means of a first and a second mounting cones 20, the tip seal pusher 30 and the tip seal fitting cylinder 50.
Firstly, the tip seal 18 is placed around the outer surface 26 of the first mounting cone 20 at the second end 24 of the mounting cone 20.
Secondly, the first mounting cone 20 is introduced inside the tip seal pusher 30 such that the direction A of the first mounting cone coincides with the direction of the tip seal pusher 30.
In particular, the second end 24 is inserted in the first hole 35. The contact between the tip seal 18 and the front face 36 of the tip seal pusher 30 provokes a displacement of the tip seal 18 along the outer surface 26 towards the first end 22 of the first mounting cone 20. Thirdly, as shown in figure 10, the first end 22 of the first mounting cone 20 and the first end of the nose 14 are put in contact, which advantageously provokes a portion of the first end of the nose 14 to be inserted in the hollow 28.
Once the first mounting cone 20 and the nose 14 are in contact, a force substantially parallel to a longitudinal direction A of the first mounting cone is applied to the tip seal pusher 30. The force provokes a displacement of the tip seal pusher 30 along the longitudinal direction A of the first mounting cone 20, inducing the displacement of the tip seal 18 along the outer surface 26 of the first mounting cone in the direction of the first end 22 because of the contact between the tip seal 18 and the front face 36.
While displacing the tip seal pusher 30 along the longitudinal direction A of the first mounting cone 20, the diameter d5 of the first hole 35 increases gradually, such that the diameter d5 is substantially equal to a diameter of the first mounting cone 20 at every moment.
The pushing of the tip seal 18 by the force applied to the tip seal pusher 30 is finished when the second end 24 contacts the cap 39. As previously explained, the length L of the first mounting cone is chosen such that when the second end 24 of the first mounting cone 20 contacts the cap 39, the tip seal 18 is placed in a final position in which the tip seal 18 must be installed.
In the final position of the tip seal 18 on the nose 14, the first mounting cone 20 is integrally inside the cavity 38. The cap 39 is then removed from the cavity 38 to extract the first mounting cone 20 from the cavity 38.
When the tip seal 18 attains the final position, a portion of the nose 14 is disposed inside the cavity 38 of the tip seal pusher 30.
The method also comprises a step for extracting the nose 14 of the GDI fuel injector 10 from the tip seal pusher 30.
Then, as shown in figure 12, the nose 14 is inserted in the cavity 56 of the tip seal fitting cylinder 50 in order to adapt the internal diameter of the tip seal 18 to the diameter dl of the nose 14 at the level of the slot 16. Advantageously, the longitudinal direction D and the longitudinal direction L are coincident when the nose 14 is inserted in the cavity 56.
Adapting the internal diameter of the tip seal 18 to the diameter dl is possible by applying a rotational movement along the longitudinal direction D to the tip seal fitting cylinder 50. Since the diameter dlO of the second portion 58 of the tip seal fitting cylinder 50 is substantially equal to the diameter d2 of the nose 14, the rotational movement applied to the fitting cylinder 50 further provokes that an external diameter of the tip seal 18 is substantially equal to the diameter d2 of the nose 14.
Finally, the nose 14 is extracted from the tip seal fitting cylinder 50.
The same steps are applied in order to install the second tip seal 19 on the nose 14, but in this case the second mounting cone 20 is employed instead of the first mounting cone 20. The first and the second mounting cones 20 differ in length. For example, the second mounting cone 20 is shorter than the first mounting cone 20. On the contrary, a section of a first end 22 of the first mounting cone 20 is substantially equal to a section of a first end 22 of the second mounting cone 20, and a section of a second end 24 of the first mounting cone 20 is substantially equal to a section of a second end 24 of the second mounting cone 20.
Therefore, when, as in the embodiment of figure 2, the GDI fuel injector 10 comprises a plurality of slots 16 for installing a tip seal therein, a plurality of mounting cones 20 is employed. The method previously described is then applied separately for each mounting cone 20 of the plurality of mounting cones 20. Each mounting cone 20 of the plurality of cones has a length adapted such that when the second end 24 of each mounting cone 20 and the cap 39 are in contact, the tip seal associated to each mounting cone 20 is placed at the level of the slot 16 in which said tip seal must be installed.
Preferably, the method previously described is firstly applied with the mounting cone having a shorter length L. Consequently, the first tip seal 18 installed on the nose 14, is the tip seal positioned closer from the main body 12 of the GDI fuel injector 10.
Please note that the invention is not limited to the illustrated embodiments and method. In particular, when a plurality of mounting cones 20 are employed, the first tip seal 18 to be installed can be the tip seal associated to the longest mounting cone 20. LIST OF REFERENCES
A longitudinal direction of the mounting cone B longitudinal direction of the of the tip seal pusher
C longitudinal direction of the main body of the cap
D longitudinal direction of the fitting cylinder L longitudinal direction of the GDI fuel injector LI length of the of the first end of the mounting cone L2 length of the second end of the mounting cone L3 length of the second portion of the tip seal pusher L4 length of the main body of the cap L5 length of the first portion of the fitting cylinder L6 length of the second portion of the fitting cylinder dl diameter of the nose at the level of the slot d2 diameter of the nose d3 internal diameter of the mounting cone at the hollow d4 external diameter of the mounting cone at the hollow d5 diameter of the first hole d6 diameter of the second hole d7 diameter of the cavity d8 diameter of a first end of the first portion of the cavity d9 diameter of the second end of the first portion of the tip seal cylinder dlO diameter of the second portion of the tip seal fitting cylinder
10 GDI fuel injector
12 body of the GDI fuel injector
14 nose of the GDI fuel injector
15 external surface of the nose
16 slot
18 first tip seal
19 second tip seal
20 mounting cone
22 first end of the mounting cone
24 second end of the mounting cone
26 outer surface of the mounting cone
27 first portion of the first end of the JET filter pushing rod
28 hollow
30 tip seal pusher
31 first portion of the tip seal pusher
32 second portion of the tip seal pusher
33 third portion of the tip seal pusher
34 groove first hole of the tip seal pusher front face of the tip seal pusher rear face of the tip seal pusher cavity of the tip seal pusher cap main body of the cap base of the cap first portion of the main body of the cap second portion of the main body of the cap second hole of the tip seal pusher tip seal fitting cylinder rough portion of the tip seal fitting cylinder smooth portions of the tip seal fitting cylinder cavity of the tip seal fitting cylinder first portion of the cavity of the tip seal fitting cylinder second portion of the cavity of the tip seal fitting cylinder seal

Claims

CLAIMS:
1. A kit for installing a tip seal (18, 19) on a nose (14) of a gasoline direct- injection (GDI) fuel injector (10), the nose having a substantially cylindrical shape and comprising at least one slot (16) shaped to be covered by the tip seal (18, 19), the tip seal (18, 19) being deformable, the kit comprising at least one between:
- at least one mounting cone (20); or
- a tip seal pusher (30); or
- a tip seal fitting cylinder (50).
2. The kit as per claim 1, comprising a first mounting cone (20) and a second mounting cone (20), the first mounting cone (20) receiving a first tip seal (18) around an outer surface (26), the second mounting cone (20) receiving a second tip seal (19) around an outer surface (26), wherein a length (L) of the first mounting cone (20) is longer than a length (L) of the second mounting cone (20).
3. The kit as per claim 2, wherein a section of a first end (22) of the first mounting cone (20) is substantially equal to a section of a first end (22) of the second mounting cone (20), and a section of a second end (24) of the first mounting cone (20) is substantially equal to a section of a second end (24) of the second mounting cone (20).
4. The mounting cone (20) of the kit of anyone of claims 1 to 3, the mounting cone (20) comprising an outer surface (26) configured to receive a tip seal (18, 19), the mounting cone (20) having a length (L) such that the tip seal (18, 19) is placed in a final position on the GDI fuel injector (10) when a first end (22) of the mounting cone (20) contacts a first end of the nose (14) of the GDI fuel injector (10) and a second end (24) of the mounting cone (20) contacts a cap (39) inserted in the tip seal pusher (30).
5. The tip seal pusher (30) of the kit of anyone of claims 1 to 3, the tip seal pusher (30) comprising a front face (36) and a rear face (37), the front face (36) comprising a first hole (35) adapted to receive the mounting cone (20) having a tip seal (18, 19) on an outer surface (26), the rear face (37) comprising a second hole (44), the second hole (44) being adapted to receive a cap (39).
6. The tip seal pusher (30) as per claim 5, wherein the first hole (35) is sized such that the front face (36) of the tip seal pusher (30) pushes the tip seal (18, 19) along the outer surface (26) of the mounting cone (20) when the mounting cone (20) is received in the first hole (35).
7. The tip seal pusher (30) as per anyone of claims 5 or 6, comprising a longitudinal cavity (38) extending between the first hole (35) and the second hole (44).
8. The tip seal fitting cylinder (50) of the kit of anyone of claims 1 to 3, the tip seal fitting cylinder (50) comprising a longitudinal cavity (56) adapted to receive the nose (14) of the GDI fuel injector (10), the longitudinal cavity (56) being shaped to adapt a diameter of at least one tip seal (18, 19) installed on the nose (14) of the GDI fuel injector (10).
9. The tip seal fitting cylinder (50) as per claim 8, wherein the longitudinal cavity (56) comprises a first portion (57) and a second portion (58), the first portion (57) having a substantially frustoconical shape, the second portion (58) having a substantially cylindrical shape, a diameter (dlO) of the second portion (58) being substantially equal to a diameter of the nose (d2) of the GDI fuel injector (10).
10. A method for installing a first tip seal (18) and a second tip seal (19) on a nose (14) of a GDI fuel injector (10) by means of a first and a second mounting cones (20) as per claim 4, the tip seal pusher (30) as per anyone of claims 5 to 7 and the tip seal fitting cylinder (50) as per anyone of claims 8 or 9, a length (L) of the second mounting cone (20) being shorter than a length (L) of the first mounting cone (20), the method comprising the following steps for installing said first tip seal (18): a) placing the first tip seal (18) around the outer surface (26) of the first mounting cone (20); b) partially inserting the first mounting cone (20) in the first hole (35) of the tip seal pusher (30); c) establishing a contact between the first end (22) of the first mounting cone (20) and the first end of the nose (14) of the GDI fuel injector (10); d) pushing the first tip seal (18) along the outer surface (26) of the first mounting cone (20) by applying a force on the tip seal pusher (30) until the second end (24) of the first mounting cone (20) contacts the cap (39) in the tip seal pusher (30), the force being substantially parallel to a longitudinal axis (A) of the first mounting cone (20); e) extracting the nose (14) of the GDI fuel injector (10) from the tip seal pusher (30); f) inserting the nose (14) of the GDI fuel injector (10) in the tip seal fitting cylinder (50); g) applying a rotational movement to the tip seal fitting cylinder (50); and h) extracting the nose (14) of the GDI fuel injector (10) from the tip seal fitting cylinder (50).
11. The method for installing a first tip seal (18) and second tip seal (19) as per claim 10, the method further comprising the following steps for installing the second tip seal (19): a) placing the second tip seal (19) around the outer surface (26) of the second mounting cone (20); b) partially inserting the second mounting cone (20) in the first hole (35) of the tip seal pusher (30); c) establishing a contact between the first end (22) of the second mounting cone (20) and the first end of the nose (14) of the GDI fuel injector (10); d) pushing the second tip seal (19) along the outer surface (26) of the second mounting cone (20) by applying a force on the tip seal pusher (30) until the second end (24) of the second mounting cone (20) contacts the cap (39) in the tip seal pusher (30), the force being substantially parallel to a longitudinal axis (A) of the second mounting cone (20); e) extracting the nose (14) of the GDI fuel injector (10) from the tip seal pusher (30); f) inserting the nose (14) of the GDI fuel injector (10) in the tip seal fitting cylinder (50); g) applying a rotational movement to the tip seal fitting cylinder (50); and h) extracting the nose (14) of the GDI fuel injector (10) from the tip seal fitting cylinder (50).
PCT/EP2021/050101 2020-01-07 2021-01-06 Kit for installing a tip seal on a nose of a gdi fuel injector WO2021140106A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21700256.7A EP4088018A1 (en) 2020-01-07 2021-01-06 Kit for installing a tip seal on a nose of a gdi fuel injector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2000168.1A GB2590930B (en) 2020-01-07 2020-01-07 Kit for installing a tip seal on a nose of a GDI fuel injector
GB2000168.1 2020-01-07

Publications (1)

Publication Number Publication Date
WO2021140106A1 true WO2021140106A1 (en) 2021-07-15

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PCT/EP2021/050101 WO2021140106A1 (en) 2020-01-07 2021-01-06 Kit for installing a tip seal on a nose of a gdi fuel injector

Country Status (3)

Country Link
EP (1) EP4088018A1 (en)
GB (1) GB2590930B (en)
WO (1) WO2021140106A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022383A1 (en) * 2000-05-08 2001-11-29 Guenther Schulz Appliance for pulling on sealing rings onto pipe ends has conical pin with wide and tapered end, sleeve and aligning holder.
JP2002364494A (en) * 2001-05-31 2002-12-18 Toyota Motor Corp Outer diameter correction method and outer diameter correction tool of combustion gas seal for injector
US20050109325A1 (en) * 2003-11-25 2005-05-26 Yukiharu Tomita Installation procedure and correction jig for a combustion gas seal for an injector
US20080314365A1 (en) * 2007-06-21 2008-12-25 Freudenberg-Nok General Partnership Gas Direct Injector Tip Seal
US20120216781A1 (en) * 2009-10-14 2012-08-30 Thilo Beckmann Method for installing a sealing ring
EP3453866A1 (en) * 2017-09-12 2019-03-13 Robert Bosch GmbH Push device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022383A1 (en) * 2000-05-08 2001-11-29 Guenther Schulz Appliance for pulling on sealing rings onto pipe ends has conical pin with wide and tapered end, sleeve and aligning holder.
JP2002364494A (en) * 2001-05-31 2002-12-18 Toyota Motor Corp Outer diameter correction method and outer diameter correction tool of combustion gas seal for injector
US20050109325A1 (en) * 2003-11-25 2005-05-26 Yukiharu Tomita Installation procedure and correction jig for a combustion gas seal for an injector
US20080314365A1 (en) * 2007-06-21 2008-12-25 Freudenberg-Nok General Partnership Gas Direct Injector Tip Seal
US20120216781A1 (en) * 2009-10-14 2012-08-30 Thilo Beckmann Method for installing a sealing ring
EP3453866A1 (en) * 2017-09-12 2019-03-13 Robert Bosch GmbH Push device

Also Published As

Publication number Publication date
GB2590930A (en) 2021-07-14
EP4088018A1 (en) 2022-11-16
GB2590930B (en) 2022-05-25
GB202000168D0 (en) 2020-02-19

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