GB2595275A

GB2595275A - Kit for replacing filter and a jet installed into a GDI fuel injector or into a GDI fuel pump

Info

Publication number: GB2595275A
Application number: GB2007530.5A
Authority: GB
Inventors: Hoarau Yann; Corboeuf Cyrille
Original assignee: Delphi Technologies IP Ltd
Current assignee: Delphi Technologies IP Ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2021-11-24
Anticipated expiration: 2040-05-20
Also published as: GB2595275B; GB202007530D0

Abstract

A kit for replacing a filter 44 or jet 46 assembly in an inlet of a GDI fuel injector 10 or GDI fuel pump comprising a set of one of; a set of extraction tools such as a drill or screwdriver 70 shaped to cooperate with the filter or jet, a set of installation tools such as a mounting pin and mounting socket, and a set of guiding tools comprising a guide 100 shaped to cooperate with the screwdriver or mounting pin. The kit prevents contamination of the inlet during changing of the filter. The embodied kit comprises all of the above tools, the drill used to remove the jet, the screwdriver used to remove the filter, the mounting pin and socket to install the assembly. The mounting pin and screwdriver fit snugly within the guide.

Description

MT FOR REPLACING A FILTER AND A JET INSTALLED INTO A GDI

FUEL INJECTOR OR INTO A GDI FUEL PUMP

TECHNICAL FIELD

The present invention relates to a kit for replacing an assembly comprising at least one of a filter and a jet installed into a head of a gasoline direct-injection (GDI) fuel injector or into fuel inlet of a GDI fuel pump, and associated methods

BACKGROUND OF THE INVENTION

It is known that a gasoline direct-injection (GDI) system of a vehicle fuel engine comprises a GDI fuel injector and a GDI fuel pump. The GDI fuel injector and the GDI fuel pump are crossed by fuel travelling from a fuel tank to a combustion chamber of the vehicle fuel engine.

Fuel arriving to the GDI fuel injector or the GDI fuel pump brings impurities. These impurities come from different elements of the motor vehicle engine that are crossed by the fuel before arriving at the GDI fuel injector or the GDI fuel pump. These elements are for example the fuel tank, a fuel heater or other parts of the fuel pump. Impurities can also appear because of a low quality fuel.

In order to prevent said impurities from entering the GDI fuel injector or the GDI fuel pump an assembly comprising at least one of a filter and a jet is provided into a head of a GDI fuel injector or into a fuel inlet of a GDI fuel pump. Thus, impurities are accumulated in the filter and the jet.

The accumulation of these impurities impacts the functioning of the filter and the jet, which must be replaced by new ones when the quantity of accumulated impurities is important. Also, the filter and the jet must be extracted from the GDI fuel injector and the GDI fuel pump when a diagnosis of the state of the GDI fuel injector or of the GDI fuel pump is required. The extraction of the filter and the jet must be as cleanly as possible, without affecting the functionality of the GDI fuel injector or of the GDI fuel pump, and limiting the introduction of residues therein. Nevertheless, several designs of GDI fuel injectors, GDI fuel pumps, filters and jets exist. Then, the devices employed to replace the filter and the jet must be suitable for each of said designs. Otherwise, the filter and the jet cannot be replaced, or the GDI fuel injector or the GDI fuel pump risk of being damaged.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to resolve the above-mentioned problem in providing a kit for replacing an assembly comprising at least one of a filter and a jet installed into a head of a gasoline direct-injection (GDI) fuel injector or into a fuel inlet of a GDI fuel pump, the filter comprising a first portion and a second portion, the first portion being substantially cylindrical, the second portion being substantially prismatic, the jet being ring-shaped, a bore being provided in a substantially central position of the jet, the kit comprising at least one between: - a set of extraction tools for extracting the assembly, the set of extraction tools comprising at least one between a drill bit or a screwdriver shaped to cooperate with the assembly; or - a set of installation tools for installing the assembly, the set of installation tools comprising a mounting socket and at least one mounting pin, the at least one mounting pin being shaped to cooperate with the assembly; or - a set of guiding tools comprising at least one guide shaped to cooperate with the screwdriver or the at least one mounting pin. Thanks to the claimed kit, the at least one guide is adapted to cooperate with a specific design of the head of the GDI fuel injector or of the fuel inlet of the GDI fuel pump, and the at least one mounting pin is adapted to cooperate with a specific design of the filter or of the jet, as well as with the at least one guide. Then, the filter and the jet can be replaced regardless of the designs of the GDI fuel injector, the GDI fuel pump, the filter or the jet.

The invention further extends to the set of extraction tools of the kit as previously described, wherein the drill bit comprises a bar and a block, the block being crossed by a longitudinal cavity, the bar being shaped to be partially installed in the longitudinal cavity of the block, a first end and a second end of the bar remaining outside said longitudinal cavity, and wherein the screwdriver comprises a holder and a bar, the bar having a threaded end.

In an embodiment of the set of extraction tools, the first end of the bar of the drill bit is shaped to drill over the bore of the jet such that a diameter of said bore is increased.

In an embodiment of the set of extraction tools, the bar of the screwdriver is shaped to cooperate with the at least one guide of the set of guiding tools, the threaded end of the bar being shaped to cooperate with the assembly.

The invention further extends to the set of installation tools of the kit as previously described, wherein the mounting socket comprises a longitudinal cavity, the longitudinal cavity comprising a first portion and a second portion, the first portion being shaped to cooperate with a first end of the at least one mounting pin, the second portion being shaped to cooperate with the at least one guide.

In an embodiment of the set of installation tools, the mounting socket comprises a transversal cavity extending in a substantially perpendicular direction with respect to the first portion of the longitudinal cavity of the mounting socket, the transversal cavity being provided with a spring stopper such that the first end of the at least one mounting pin is fastened in the longitudinal cavity of the mounting socket.

In an embodiment of the set of installation tools, the second portion of the longitudinal cavity of the mounting socket comprises a threaded lateral wall. The invention further extends to the set of guiding tools of the kit as previously described, wherein the at least one guide comprises a first portion and a second portion, the first portion and the second portion being crossed by a longitudinal cavity, the first portion comprising a lateral aperture shaped to install the at least one guide surrounding the head of the GDI fuel injector or the fuel inlet of GDI fuel pump, the second portion comprising a threaded external wall.

The invention further extends to a method for extracting an assembly comprising at least one of a filter and a jet installed into a head of a gasoline direct-injection (GDI) fuel injector or into a fuel inlet of a GDI fuel pump by means of the set of extraction tools as previously described and the set of guiding tools as previously described, the method for extracting comprising the following steps: a) installing the at least one guide on the head of the GDI fuel injector or on the fuel inlet of the GDI fuel pump; d) inserting the bar of the screwdriver in the longitudinal cavity of the at least one guide while applying a rotational movement to the screwdriver; c) screwing the threaded end of the screwdriver to the assembly; and d) extracting the screwdriver with the assembly from the longitudinal cavity of the at least one guide (100).

The invention further extends to a method for installing an assembly comprising at least one of a filter and a jet into a head of a gasoline direct-injection (GDI) fuel injector or into a fuel inlet of a GDI fuel pump by means of the set of installation tools as previously described and the set of guiding tools as previously described, the method for extracting comprising the following steps: a) fastening the first end of the at least one mounting pin in the first portion of the longitudinal cavity of the mounting socket; b) installing the at least one guide on the head of the GDI fuel injector or on the fuel inlet of the GDI fuel pump, c) pushing the assembly with the at least one mounting pin along the longitudinal cavity of the at least one guide, a first rotational movement being applied to the at least one mounting pin; d) screwing the second portion of the longitudinal cavity of the mounting socket to the threaded external wall of the second portion of the at least one guide; e) installing the assembly into the head of the GD1 fuel injector or into the fuel inlet of the GDI fuel pump; f) unscrewing the second portion of the longitudinal cavity of the mounting socket from the threaded external wall of the second portion of the at least one guide by applying a second rotational movement to the at least one mounting pin; and g) extracting the at least one mounting pin from the longitudinal cavity of the guide.

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 and a detail of a GDI fuel injector. Figure 2 shows a perspective view and a detail of the CDT fuel pump.

Figure 3 shows a schematic front view of a drill bit as per the present invention.

Figure 4 shows a perspective view of the drill bit of figure 3.

Figure 5 shows a schematic front view of a screwdriver as per the present invention.

Figure 6 shows a perspective view of the screwdriver of figure 5 Figure 7 shows a perspective view of a mounting socket as per the present invention.

Figure 8 shows a schematic longitudinal section of the mounting socket of figure 7 Figure 9 shows a schematic longitudinal view of a mounting pin as per a first embodiment of the present invention.

Figure 10 shows a perspective view of the mounting pin of figure 9.

Figure 11 shows a perspective view of a mounting pin as per a second embodiment the present invention.

Figure 12 shows a schematic longitudinal view of a guide as per a first embodiment of the present invention.

Figure 13 shows a schematic longitudinal view of a guide as per a second embodiment of the present invention.

Figure 14 shows the drill bit of figure 3 and the GD1 fuel injector of figure 1 before interaction between them.

Figure 15 shows the screwdriver of figure 5 in contact with the guide of figure 12, the guide being mounted on the GDI fuel injector of figure 1.

Figure 16 shows the mounting pin of figure 12 mounted on the mounting socket of figure 7 and interacting with the guide of figure 12, the guide being mounted on the GDI fuel injector of figure 1.

Figure 17 shows the guide of figure 13 mounted on the GDI fuel pump of figure 2.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

As shown in figure 1, a GDI fuel injector 10 comprises a body 12, a head 14, a nose 16 and an electrical connector 18. The head 14 allows an entry of fuel in 30 the GDI fuel injector 10 The nose 16 allows an exit of fuel from the GDI fuel injector 10.

The head 14 extends from a first end of the body 12, forming a first end of the GM fuel injector 10. The nose 16 extends from a second end of the body 12, forming a second end of the GDI fuel injector 10. The body 12, the head 14 and the nose 16 extend along a longitudinal direction A of the GDI fuel injector 10.

The body 12 and the nose 16 have a substantially cylindrical shape. A section of the body 12 is larger than a section of the nose 16. The head 14 comprises a first portion 20 and a second portion 22. The first portion 20 and the second portion 22 are substantially cylindrical, a section of the first portion 20 being larger than a section of the second portion 22. The section of the first portion is smaller than the section of the body 12. The section of the second portion 22 is substantially equal to the section of the nose 16.

Advantageously, the head 14 and the nose 16 are hollow such that fuel can flow therein.

As shown in figure 2, a GDI fuel pump 30 comprises a chamber 32, a fuel inlet 34 and a fuel outlet 36. The fuel inlet 34 allows an entry of fuel in the fuel pump 30. The fuel outlet 36 allows fuel to exit from the fuel pump 30.

The chamber 32 has a substantially cylindrical shape extending along a longitudinal direction B of the GDI fuel pump 30. The chamber 32 comprises a lateral wall 38. The fuel inlet 34 and the fuel outlet 36 extend from the lateral wall 38. The the] inlet 34 extends along a first direction and the fuel outlet 36 extends along a second direction. In the embodiment shown in figure 2, the first direction and the second direction are substantially perpendicular between them, but they could form any other angle between them. For example, the fuel inlet 34 and the fuel outlet 36 can extend along a same direction, forming an angle between them substantially equal to 180°. Advantageously, the first direction and the second direction are comprised in a plane substantially perpendicular to the longitudinal direction B. The fuel inlet 34 and the fuel outlet 36 are hollow.

The fuel inlet 34 has a substantially cylindrical shape comprising a lateral wall 40. An annular protrusion 42 is provided around a portion of the lateral wall 40 The head 14 of the GDI fuel injector 10 and the fuel inlet 34 of the GDI fuel pump 30 are provided with an assembly comprising at least one of a filter 44 and a jet 46.

The filter 44 is placed into the head 14 or into the fuel inlet 34. In particular, the filter 44 is placed into a free end of the head 14 or into a free end of the fuel inlet 34.

Advantageously, a size and a shape of the filter 44 are such that the filter 44 is fitted into the head 14 or into the fuel inlet 34. As particularly shown in figures and 16, the filter 44 comprises a first portion 48 and a second portion 50. The first portion 48 has a substantially cylindrical shape. The second portion 50 has a substantially prismatic shape. Advantageously, the first portion 48 and the second portion 50 are hollow.

Alternatively, the head 14 is also provided with the jet 46. As shown in figures 1 and 16, the jet 46 is placed over the first portion 48 of the filter 44. The fuel inlet 34 can also be provided with a jet 46.

The jet 46 is substantially ring shaped. Advantageously, a size of the jet 46 is such that the jet 46 is fitted into the head 14 or into the fuel inlet 34. The jet 46 comprises a bore 52 such that fuel can enter into the filter 44. The bore 52 is preferably placed in a substantially central position of the jet 46.

The present invention relates to a kit for replacing the filter 44 and the jet 46 installed into the head 14 or into the fuel inlet 34.

The kit comprises at least one between a set of extraction tools, a set of installation tools or a set of guiding tools.

The set of extraction tools allows extracting the filter 44 and the jet 46 from the head 14 or from the fuel inlet 34. The set of extraction tools comprises at least one between a drill bit 60 or a screwdriver 70.

As shown in figures 3 and 4, the drill bit 60 comprises a bar 62 and a block 64. The drill bit 60 also comprises a screw 61.

The bar 62 and the block 64 have a substantially cylindrical shape extending along a longitudinal direction C of the drill bit 60. A section of the block 64 is larger than a section of the bar 62.

The block 64 comprises a front face 66, a rear face 67 and a lateral wall 68. The block 64 is crossed by a longitudinal cavity 65. The longitudinal cavity 65 extends along the longitudinal direction C between the front face 66 and the rear face 67. Advantageously, the longitudinal cavity 65 is placed at a substantially central position of the block 64. For example, the longitudinal cavity 65 is cylindrically-shaped.

As clearly shown in figure 4, the block 64 further comprises a blind groove 69. The blind groove 69 goes into the block 64 from the lateral wall 68. The blind groove 69 extends in a radial direction of the block 64 at least until the longitudinal cavity 65 is intersected. Preferably, the blind groove 69 goes beyond the longitudinal cavity 65. Advantageously, in the longitudinal direction C, the blind groove 69 extends between the front face 66 and the rear face 67.

The blind groove 69 confers flexibility to the block 64, such that a diameter of the longitudinal cavity 65 can be adjusted in order to receive the bar 62.

At least one recess 73 is provided in the lateral wall 68. The at least one recess 73 is placed laterally on a side of the blind groove 69. Advantageously, a first recess 73 is provided on a first lateral side of the blind groove 69 and a second recess 73 is provided on a second lateral side of the blind groove 69.

Advantageously, a bottom of each recess 73 comprises a through hole (not shown) connecting with the blind groove 69. The at least one recess and the associated through hole are shaped to receive the screw 61 Advantageously, the block 64 is made of steel. Particularly, the block 64 is made of medium carbon steel, as for example C35. Advantageously, the screw 61 is also made of steel.

The bar 62 is shaped to be received in the longitudinal cavity 65, as previously said. In particular, the bar 62 is partially installed in the longitudinal cavity 65. A first end 71 and a second end 72 of the bar 62 remain outside the longitudinal cavity 65. The first end 71 of the bar comprises a tip 63. The tip 63 is shaped to drill over the bore 52 when the tip 63 contacts the jet 46 and a rotational movement is applied to the drill bit 60. For example, the tip 63 has a substantially conical shape. By drilling over the bore 52 with the tip 63, a diameter of the bore 52 is increased.

A length of the first end 71 and a length of the second end 72 can be adjusted by displacing the bar inside the longitudinal cavity 65. For example, the length of the first end 71 is comprised in a range from 1 mm to 5 mm, preferably from 2 mm to 3.5 mm.

Preferably, the length of the first end 71 is shorter than the length of a second end 72. In order to fix the length of the first end '71 and the second end 72, the screw 61 is tightened such that the bar 62 installed in the longitudinal cavity 65 is prevented from moving along the longitudinal direction C. Figures 5 and 6 show the screwdriver 70. The screwdriver 70 comprises a holder 74 and a bar 75. The holder 74 and the bar 75 extend along a longitudinal direction D of the screwdriver 70.

The holder 74 is substantially cylindrically-shaped. An external surface of the holder 74 can be substantially smooth or rough. Preferably, at least a portion of the external surface of the holder 74 is rough.

As clearly shown in figure 5, the bar 75 comprises a narrowed end 76, a central part 77 and a threaded end 78. The narrowed end 76 is fixed to the holder 74. The central part 77 connects the narrowed end 76 and the threaded end 78.

The narrowed end 76 and the central part 77 are substantially cylindrically-shaped, a section of the central part 77 being larger than a section of the narrowed end 76. The section of the central part 77 is smaller than a section of the holder 74. The threaded end 78 has a substantially conical shape. An external surface of the threaded end 78 is threaded.

The threaded end 78 is shaped to cooperate with the assembly comprising at least one of the filter 44 and the jet 46. For example, the threaded end is shaped to cooperate with the first portion 48 of the filter 44. The threaded end 78 is also shaped to cooperate with the bore 52 of the jet 46.

The screwdriver 70 further comprises a block 79. The block 79 is substantially ring shaped. For example, a section of the block 79 is substantially larger than the section of the holder 74.

The block 79 comprises a front face 81, a rear face 82, a lateral wall 83 and a bore 84. The front face 81 is substantially parallel to the rear face 82. Advantageously, the front face 81 and the rear face 82 are substantially smooth. The lateral wall 83 can be smooth or rough. Preferably, at least a portion of the lateral wall 83 is rough.

The bore 84 crosses the block 79 from the rear face 82 to the front face 81. The bore 84 extends along a direction substantially parallel to the longitudinal direction D. Advantageously, the bore 84 is provided in a central part of the block 79. A shape and a dimension of the bore 84 are chosen such that the block 79 can be installed surrounding a portion of the central part 77 of the bar 75. Advantageously, a position of the block 79 along the central part 77 can be adjusted depending on a design of the set of guiding tools as it will later described.

Advantageously, the screwdriver 70 is made of steel. Particularly, the screwdriver 70 is made of medium carbon steel, as for example C45. Advantageously, the block 79 is made of steel. Particularly, the block 79 is made of medium carbon steel, as for example C35 The set of installation tools allows installing the filter 44 and the jet 46 into the head 14 or into the fuel inlet 34. The set of installation tools comprises a mounting socket 80 and at least one mounting pin 90.

As shown in figure 7, the mounting socket 80 has a substantially cylindrical shape extending along a longitudinal direction E. The mounting socket 80 comprises a front face 85, a rear face 86 and a lateral wall 87. The lateral wall 87 can be smooth or rough. Preferably, at least a portion of the lateral wall 87 is rough Advantageously, the mounting socket 80 is made of steel. Particularly, the mounting socket 80 is made of medium carbon steel, as for example E45.

A longitudinal cavity 88 extends in the longitudinal direction E from the rear face 86 to the front face 85. As clearly shown in figure 8, the longitudinal cavity 88 comprises a first portion 89 and a second portion 91. The first portion 89 extends from the rear face 86 to the second portion 91. The second portion 91 extends from the first portion 89 to the front face 85.

A section of the first portion 89 is smaller than a section of the second portion 91. For example, the first portion 89 and the second portion 91 are substantially cylindrically-shaped.

A transversal cavity 92 extends from the lateral wall 87 to the first portion 89 of the longitudinal cavity 88. The transversal cavity 92 extends in a substantially perpendicular direction with respect to the first portion 89.

A spring stopper 93 is provided in the transversal cavity 92. The spring stopper 93 comprises a spring 94 and a stop 95. The stop 95 projects in the first portion 89 of the longitudinal cavity 88. The spring 94 is able to compress when a pressure is exerted over the stop 95. Advantageously, the spring stopper 93 is totally or partially made of a metallic material. For example, the spring stopper 93 is totally or partially made of stainless steel A protrusion 96 projects in the first portion 89 of the longitudinal cavity 88. The protrusion 96 is placed substantially in front of the spring stopper 93.

Advantageously, a lateral wall 97 of the second portion 91 is threaded.

As shown in figures 9 to I I, the at least one mounting pin 90 comprises a first end 98, a second end 99 and a central portion 101. The first end 98, the second end 99 and the central portion 101 extend along a longitudinal direction F of the mounting pin 90. Advantageously, a surface of the mounting pin 90 is substantially 10 smooth.

The first end 98 has a shape and dimensions suitable for cooperate with the first portion 89 of the longitudinal cavity 88. For example, the first end 98 has a substantially cylindrical shape, a section of the first end 98 being substantially equal to the section of the first portion 89.

The first end 98 is installed inside the first portion 89 of the longitudinal cavity 88. An annular recess 102 is placed at a substantially central part of the first end 98. Advantageously, when the first end 98 is installed inside the first portion 89, the spring stopper 93 and the protrusion 96 lie in the annular recess 102. In particular, since the section of the first end 98 is substantially equal to the section of the first portion 89, when the first end 98 is inserted in the first portion 89, the spring stopper 93 is firstly compressed. When the annular recess 102 lies in front of the spring stopper 93, the spring stopper 93 is relaxed and elongates. The stop 95 is then at least partially inserted in the annular recess 102. Then, the mounting pin 90 is fastened in the longitudinal cavity 88 such that the mounting pin 90 is fixedly assembled in the mounting socket 80.

The central portion 101 has a substantially cylindrical shape. A section of the central portion 101 is larger than a section of the first end 98. Advantageously, the section of the central portion 101 is substantially equal to the section of the central part 77 of the screwdriver's bar 75.

The second end 99 is shaped to cooperate with the assembly comprising at least one of the filter 44 and the jet 46. The second end 99 is substantially cylindrically-shaped. A section of the second end 99 is smaller than a section of the central portion 101. In the embodiment of figures 9 and 10, the second end 99 further comprises a tip 103. The tip 103 has for example a substantially frustoconical shape extending along the longitudinal direction F. Advantageously, the mounting pin 90 is made of steel. Particularly, the mounting pin 90 is made of medium carbon steel, as for example C45.

The set of installation tools can comprise several mounting pins 90, each mounting pin 90 being adapted to a design of GDI fuel injector 10 or a design of GDI fuel pump 30. For example, each mounting pin 90 differs from the other mounting pins 90 in length. Additionally, each mounting pin 90 differs from the other mounting pins 90 in a shape of the second end 99. For example, some mounting pins 90 can comprise the tip 103, each mounting pin 90 differing from the others in a size of tip 103.

Advantageously, the mounting pin 90 comprises the tip 103 when the assembly comprises only the filter 44. In this case, the tip 103 is shaped to be at least partially inserted in the filter 44. Nevertheless, the mounting pin 90 can comprise the tip 130 when the assembly comprises the filter 44 and the jet 46.

The set of guiding tools allows guiding the extraction of the filter 44 and the jet 46 from the head 14 or from the fuel inlet 34. The set of guiding tools further allows guiding the installation of the filter 44 and the jet 46 into the head 14 or into the fuel inlet 34. The set of extraction tools comprises at least one guide 100.

As shown in figures 12 and 13, the guide 100 comprises a first portion 104 and a second portion 105. The first portion 104 and the second portion 105 have a substantially cylindrical shape extending along a longitudinal direction G of the guide 100. A section of the first portion 104 is larger than a section of the second portion 105 As better shown in figures 16 and 17, the first portion 104 and the second portion 105 are crossed by a longitudinal cavity 106. The longitudinal cavity 106 extends along the longitudinal direction G. A shape and a size of a first end of the longitudinal cavity 106 are chosen in order to receive the central part 77 of the screwdriver's bar 75 or the central portion 101 of the mounting pin 90. For example, a section of the first end of the longitudinal cavity 106 is substantially equal to the section of the central part 77 of the bar 75 and the section of the central portion 101 of the mounting pin 90. In addition, as previously said, the position of the block 79 along the bar 75 is adjusted depending on the length of the first end of the longitudinal cavity 106, such that when the front face 81 of the block 79 contacts the guide 100, the assembly comprising at least one of the filter 44 and the jet 46 is screwed in the threaded end 78.

A shape and a size of a second end of the longitudinal cavity 106 are chosen such that the guide 100 is able to be installed surrounding the head 14 of the GDI fuel injector 10 or the fuel inlet 34 of the GDI fuel pump 30.

In order to insert the head 14 of the GDI fuel injector 10 or the fuel inlet 34 of the GDI fuel pump 30 in the longitudinal cavity 106, a lateral aperture 107 is provided in the first portion 104. The lateral aperture 107 has a shape and dimensions adapted to the shape and dimensions of the head 14 of the GDI fuel injector 10 or the fuel inlet 34 of the GDI fuel pump 30.

For example, in the embodiment of figure 12 the guide 100 is adapted to receive the GDI fuel injector 10. The lateral aperture 107 comprises a first part 108 and a second part 109. The first part 108 and the second part 109 have a substantially parallelepiped shape, the first part 108 being larger than the second part 109. The first part 108 is shaped to receive the first portion 20 of the head 14, while the second part 109 is shaped to receive the second portion 22 of the head 14.

In the embodiment of figure 13, the guide 100 is adapted to receive the fuel inlet 34 of the GDI fuel pump 34. The lateral aperture 107 comprises a first part 110, a second part 111 and a third part 112. The first part 110, the second part 1H and the third part 112 have a substantially parallelepiped shape. The third part 112 is placed between the first part 110 and the second part 111.

A width of the first part 110 and a width of the second part 111 are substantially equal. A width of the third part 112 is larger than the width of the first part 110 and the width of the second part 111. The third part 112 is shaped to receive the annular protrusion 42 of the fuel inlet 34.

The second portion 105 is shaped such that the second portion 105 can be inserted in the second portion 91 of the mounting socket's longitudinal cavity 88.

Advantageously, the second portion 105 comprises a threaded external surface. The threaded external surface of the second portion 105 has a complementary form to the threaded surface of the second portion 91, such that the guide 100 and the mounting socket 80 can be fixed.

Advantageously, the length of the mounting pin 90 and the length of the first end of the longitudinal cavity 106 are chosen such that when the mounting socket 80 is screwed to the guide 100, the filter 44 and the jet 46 are installed in the final position into the head 14 or into the fuel inlet 34.

Advantageously, the guide 100 is made of steel. Particularly, the guide 100 is made of medium carbon steel, as for example C35.

The set of guiding tools can comprise several guides 100, each guide 100 being adapted to a design of GDI fuel injector 10 or a design of GDI fuel pump 30. For example, each guide 100 differs from the other guides 100 in length.

Additionally, each guide 100 differs from the other guides 100 in a shape and a size of the lateral aperture 107.

Now is described a method for extracting the assembly comprising at least one of the filter 44 and the jet 46 installed into the head 14 of the GDI fuel injector 10 or into the fuel inlet 34 of the GDI fuel pump 30. Said method is applied by means of the set of extraction tools and the set of guiding tools as previously described.

As shown in figure 14, when the assembly comprises the jet 46, the method of extracting the assembly includes a first step of drilling with the first end 71 of the bar 62 of the drill bit 60 over the bore 52 of the jet 46. Advantageously, the drilling over the bore 52 is done until the block 64 of the drill bit 60 contacts the jet Then, the guide 100 is installed on the head 14 of the GDI fuel injector 10 or the fuel inlet 34 of the GDI fuel pump 30. As previously explained, the guide 100 is installed surrounding the head 14 of the GDI fuel injector 10 or the fuel inlet 34 of the GDI fuel pump 30.

As shown in figure 15, once the guide 100 is installed on the head 14, the bar 75 of the screwdriver 70 is inserted in the longitudinal cavity 106 of the guide 100. The bar 75 is inserted in the longitudinal cavity 106 by applying a first force to the screwdriver 70. The first force is substantially parallel to the longitudinal direction G such that the screwdriver 70 moves forward inside the longitudinal cavity 106. While the first force is applied, a rotational movement is also applied to the screwdriver 70. Advantageously, the rotational movement is applied until the block 79 contacts the guide 100, as previously explained. A same operation is applied when the guide 100 is installed on the fuel inlet 34.

Then, the threaded end 78 of the screwdriver 70 is screwed to the first portion 48 of the filter 44 thanks to the rotational movement applied to the screwdriver 70. If the assembly comprises the jet 46, the threaded end 78 is also screwed to the bore 52 of the jet 46.

Finally, the screwdriver 70 is extracted from the guide 100 by applying a rotational movement to the screwdriver 70, together with a second force. The second force is substantially parallel to the longitudinal direction G. The second force has an opposite direction to the first force. Since the screwdriver 70 is screwed to the filter 44 and to the jet 46, the filter 44 and the jet 46 are also extracted. Now is described a method for installing the assembly comprising at least one of the filter 44 and the jet 46 into the head 14 of the GDI fuel injector 10 or into the fuel inlet 34 of the GDI fuel pump 30. Said method is applied by means of the set of installation tools and the set of guiding tools as previously described.

Firstly, the first end 98 of the mounting pin is fastened to the first portion 89 of the longitudinal cavity 88 of the mounting socket 80. As previously explained, when the first end 98 is inserted in the first portion 89, the stop 95 of the spring stopper 93 is at least partially inserted in the annular recess 102, such that the mounting pin 90 is fixedly assembled in the mounting socket 80.

Then, the guide 100 is installed on the head 14 of the GDI fuel injector 10 or the fuel inlet 34 of the GDI fuel pump 30. As previously explained, the guide 100 is installed surrounding the head 14 of the GDI fuel injector 10 or the fuel inlet 34 of the GDI fuel pump 30.

Then, the assembly comprising at least one of the filter 44 and the jet 46 is positioned in the cavity 106 of the guide 100.

Then, as shown in figure 16, the central portion 101 and the second end 99 of the mounting pin 90 are inserted in the longitudinal cavity 106 of the guide 100. The central portion 101 and the second end 99 are inserted in the longitudinal cavity 106 by applying a first force to the mounting pin 90. The first force is substantially parallel to the longitudinal direction G such that the mounting pin 90 moves forward inside the longitudinal cavity 106 and pushes the assembly along said longitudinal cavity 106. While the first force is applied, a first rotational movement is also applied to the mounting pin 90. More specifically, the first force and the first rotational movement are applied to the mounting socket 80. Since the mounting socket 80 and the mounting pin 90 are fixedly assembled, the first force and the first rotational movement are also applied to the mounting pin 90.

The first rotational movement is applied until the second portion 91 of the longitudinal cavity 88 of the mounting socket 80 is screwed to the threaded external surface of the second portion 105 of the guide 100. In this position, the second portion 105 of the guide 100 is completely inserted in the second portion 91 of the longitudinal cavity 88.

Then, the filter 44 is installed into the head 14 of the GDI fuel injector 10 or into the fuel inlet 34 of the GDI fuel pump 30. If the assembly also comprises the jet 46, the jet 46 is also installed therein. As previously explained, the length of the mounting pin 90 and the length of the first end of the longitudinal cavity 106 are chosen such that when the mounting socket 80 is screwed to the guide 100, the filter 44 and the jet 46 are installed in the final position into the head 14 or into the fuel inlet 34.

Then, the second portion 91 of the longitudinal cavity 88 of the mounting socket 80 is unscrewed from the second portion 105 of the guide 100 by applying a second rotational movement. The second rotational movement has an opposite direction to the first rotational movement.

Finally, the mounting pin 90 is extracted from the longitudinal cavity 106 by applying a second force, together with the second rotational movement. The second force is substantially parallel to the longitudinal direction G. The second force has an opposite direction to the first force.

Please note that the invention is not limited to the illustrated embodiments and methods.

LIST OF REFERENCES

A longitudinal direction of the GDI fuel injector B longitudinal direction of the GDI fuel pump * longitudinal direction of the drill bit * longitudinal direction of the screwdriver * longitudinal direction of the mounting socket * longitudinal direction of the mounting pin longitudinal direction of the guide GDI fuel injector 12 body of the GDI fuel injector 14 head of the GDI fuel injector 16 nose of the GDI fuel injector 18 electrical connector of the GDI fuel injector first portion of the head 22 second portion of the head 24 second spring GDI fuel pump 32 chamber of the GDI fuel pump 34 fuel inlet of the GDI fuel pump 36 fuel outlet of the GDI fuel pump 38 lateral wall of the chamber lateral wall of the fuel inlet 42 annular protrusion of the lateral wall of the fuel inlet 44 filter 46 jet 48 first portion of the filter second portion of the filter 52 bore of the jet drill bit 61 screw 62 bar of the drill bit 63 tip of the bar 64 block of the drill bit longitudinal cavity of the block of the drill bit 66 front face of the block of the drill bit 67 rear face of the block of the drill bit 68 lateral wall of the block of the drill bit 69 blind groove screwdriver 71 first end of the bar of the drill bit 72 second end of the bar of the drill bit 73 recess 74 holder of the screwdriver bar of the screwdriver 76 narrowed end of the bar of the screwdriver 77 central part of the bar of the screwdriver 78 threaded end of the bar of the screwdriver 79 block of the screwdriver mounting socket 81 front face of the block of the screwdriver 82 rear face of the block of the screwdriver 83 lateral wall of the block of the screwdriver 84 bore of the block of the screwdriver 85 front face of the mounting socket 86 rear face of the mounting socket 87 lateral wall of the mounting socket 88 longitudinal cavity of the mounting socket 89 first portion of the longitudinal cavity of the mounting socket 90 mounting pin 91 second portion of the longitudinal cavity of the mounting socket 92 transversal cavity of the mounting socket 93 spring stopper 94 spring 95 stop 96 protrusion 97 lateral wall of the second portion of the longitudinal cavity of the mounting socket 98 first end of the mounting pin 99 second end of the mounting pin Guide 101 central portion of the mounting pin 102 annular recess 103 tip of the mounting pin 104 first portion of the guide second portion of the guide 106 longitudinal cavity of the guide 107 lateral aperture of the first portion of the guide 108 first part of the lateral aperture 109 second part of the lateral aperture first part of the lateral aperture Ill second part of the lateral aperture 112 third part of the lateral aperture

Claims

CLAIMS: A kit for replacing an assembly comprising at least one of a filter (44) and a jet (46) installed into a head (14) of a gasoline direct-injection (GDI) fuel injector (10) or into a fuel inlet (34) of a GDI fuel pump (30), the filter (44) comprising a first portion (48) and a second portion (50), the first portion (48) being substantially cylindrical, the second portion (50) being substantially prismatic, the jet (46) being ring-shaped, a bore (52) being provided in a substantially central position of the jet (46), the kit comprising at least one between: -a set of extraction tools for extracting the assembly, the set of extraction tools comprising at least one between a drill bit (60) or a screwdriver (70) shaped to cooperate with the assembly; or -a set of installation tools for installing the assembly, the set of installation tools comprising a mounting socket (80) and at least one mounting pin (90), the at least one mounting pin (90) being shaped to cooperate with the assembly; or -a set of guiding tools comprising at least one guide (100) shaped to cooperate with the screwdriver (70) or the at least one mounting pin (90).
2. The set of extraction tools of the kit of claim 1, wherein the drill bit (60) comprises a bar (62) and a block (64), the block (64) being crossed by a longitudinal cavity (65), the bar (62) being shaped to be partially installed in the longitudinal cavity (65) of the block (64), a first end (71) and a second end (72) of the bar (62) remaining outside said longitudinal cavity (65), and wherein the screwdriver (70) comprises a holder (74) and a bar (75), the bar (75) having a threaded end (78).
3. The set of extraction tools as per claim 2, wherein the first end (71) of the bar (62) of the drill bit (60) is shaped to drill over the bore (52) of the jet (46) such that a diameter of said bore (52) is increased.
4 The set of extraction tools as per any one of claims 2 or 3, wherein the bar (75) of the screwdriver (70) is shaped to cooperate with the at least one guide (100) of the set of guiding tools, the threaded end (78) of the bar (75) being shaped to cooperate with the assembly.
5. The set of installation tools of the kit of claim 1, wherein the mounting socket (80) comprises a longitudinal cavity (88), the longitudinal cavity (88) comprising a first portion (89) and a second portion (91), the first portion (88) being shaped to cooperate with a first end (98) of the at least one mounting pin (90), the second portion (91) being shaped to cooperate with the at least one guide (100).
6. The set of installation tools as per claim 5, wherein the mounting socket (80) comprises a transversal cavity (92) extending in a substantially perpendicular direction with respect to the first portion (89) of the longitudinal cavity (88) of the mounting socket (80), the transversal cavity (92) being provided with a spring stopper (93) such that the first end (98) of the at least one mounting pin (90) is fastened in the longitudinal cavity (88) of the mounting socket (80).
7. The set of installation tools as per any one of claims 5 or 6, wherein the second portion (91) of the longitudinal cavity (88) of the mounting socket (80) comprises a threaded lateral wall (97).
8. The set of guiding tools of the kit of claim 1, wherein the at least one guide (100) comprises a first portion (104) and a second portion (105), the first portion (104) and the second portion (105) being crossed by a longitudinal cavity (106), the first portion (104) comprising a lateral aperture (107) shaped to install the at least one guide (100) surrounding the head (14) of the GDI fuel injector (10) or the fuel inlet (34) of GDI fuel pump (30), the second portion (105) comprising a threaded external wall.
9 A method for extracting an assembly comprising at least one of a filter (44) and a jet (46) installed into a head (14) of a gasoline direct-injection (GDI) fuel injector (10) or into a fuel inlet (34) of a GDI fuel pump (30) by means of the set of extraction tools as per any one of claims 2 to 4 and the set of guiding tools as per claim 8, the method for extracting comprising the following steps: a) installing the at least one guide (100) on the head (14) of the GDI fuel injector (10) or on the fuel inlet (34) of the GDI fuel pump (30); d) inserting the bar (75) of the screwdriver (70) in the longitudinal cavity (106) of the at least one guide (100) while applying a rotational movement to the screwdriver (70); c) screwing the threaded end (78) of the screwdriver (70) to the assembly; and d) extracting the screwdriver (70) with the assembly from the longitudinal cavity (106) of the at least one guide (100)
10. A method for installing an assembly comprising at least one of a filter (44) and a jet (46) into a head (14) of a gasoline direct-injection (GDI) fuel injector (10) or into a fuel inlet (34) of a GDI fuel pump (30) by means of the set of installation tools as per any one of claims 5 to 7 and the set of guiding tools as per claim 8, the method for extracting comprising the following steps: a) fastening the first end (98) of the at least one mounting pin (90) in the first portion (89) of the longitudinal cavity (88) of the mounting socket (80); b) installing the at least one guide (100) on the head of the GDI fuel injector (10) or on the fuel inlet (34) of the GDI fuel pump (30); c) pushing the assembly with the at least one mounting pin (90) along the longitudinal cavity (106) of the at least one guide (100), a first rotational movement being applied to the at least one mounting pin (90); d) screwing the second portion (91) of the longitudinal cavity (88) of the mounting socket (80) to the threaded external wall of the second portion (105) of the at least one guide (100); e) installing the assembly into the head (14) of the GDI fuel injector (10) or into the fuel inlet (34) of the GDI fuel pump (30); f) unscrewing the second portion (91) of the longitudinal cavity (88) of the mounting socket (80) from the threaded external wall of the second portion (105) of the at least one guide (100) by applying a second rotational movement to the at least one mounting pin (90); and g) extracting the at least one mounting pin (90) from the longitudinal cavity (106) of the guide (100).