EP2492489A1 - Fuel injector fixing structure of fuel rail of vehicle - Google Patents
Fuel injector fixing structure of fuel rail of vehicle Download PDFInfo
- Publication number
- EP2492489A1 EP2492489A1 EP12156854A EP12156854A EP2492489A1 EP 2492489 A1 EP2492489 A1 EP 2492489A1 EP 12156854 A EP12156854 A EP 12156854A EP 12156854 A EP12156854 A EP 12156854A EP 2492489 A1 EP2492489 A1 EP 2492489A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fixing
- fuel injector
- injector
- fuel
- holding part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 201
- 238000013016 damping Methods 0.000 claims abstract description 35
- 230000002265 prevention Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 239000003502 gasoline Substances 0.000 description 3
- 238000005219 brazing Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
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- 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
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
- F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
-
- 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
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
-
- 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
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
-
- 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
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8023—Fuel injection apparatus manufacture, repair or assembly the assembly involving use of quick-acting mechanisms, e.g. clips
-
- 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
- F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa
Definitions
- the present invention relates to a fuel rail of a vehicle, and more particularly, to a fuel injector fixing structure of a fuel rail of a vehicle, capable of fixing fuel injectors for injecting fuel into cylinders onto a main pipe of the fuel rail at predetermined intervals by using additional fixing members, so as to sufficiently absorbing a high pressure applied to the fuel injectors when the fuel injectors inject fuel and to appropriately replace the fuel injectors.
- gasoline engines mainly include indirect multi point injection (MPI) engines and port fuel injection (PFI) engines.
- MPI indirect multi point injection
- PFI port fuel injection
- GDI gasoline direct injection
- a gasoline indirect MPI engine has a fuel injection pressure of only 4 to 5bar
- a GDI engine requires a fuel injection pressure of about 120 to 200bar.
- a GDI engine includes a fuel rail including a plurality of fuel injectors for receiving fuel supplied from a fuel tank and for injecting the fuel.
- FIG. 1 A conventional fuel rail 10 having the above-described structure is illustrated in FIG. 1 .
- a plurality of mounting lugs 30 and injector holders 40 are fixed onto a main pipe 20 at predetermined intervals, and fuel injectors 50 are detachably fixed into the injector holders 40, and the pressure applied to fuel injectors 50 is absorbed by damping members 60.
- the mounting lugs 30 and the injector holders 40 are welded and fixed onto an outer surface of the main pipe 20, correspond to the number of cylinders included in an engine, and fix the fuel injectors 50 for injecting fuel into the cylinders.
- the fuel injectors 50 are inserted and fixed into lower portions of the injector holders 40, and each includes an insertion part formed at an upper portion of the fuel injector 50 and inserted into the injector holder 40, and an injection part formed at a lower portion of the fuel injector 50 and for injecting fuel.
- a connection unit connected to a power source is formed at a side of the fuel injector 50.
- Each of the damping members 60 mainly includes a fixing part surrounding and fixing the fuel injector 50, and damping parts integrally formed at a side of the fixing part, having elasticity, and absorbing the pressures transferred from the fuel injector 50.
- the damping member 60 for fixing the fuel injector 50 is fixed onto a body part of the fuel injector 50 before being elastically supported under the injector holder 40, and absorbs a high pressure applied to the fuel injector 50 when the fuel injectors 50 injects fuel.
- a space for fixing the fuel injector 50 onto the main pipe 20 of the fuel rail 10 may be insufficient. As such, when a product is transferred, assembled, removed, or replaced, the fuel injector 50 may be departed from the injector holder 40.
- the present invention provides a fuel injector fixing structure of a fuel rail of a vehicle, in which an additional fixing member for fixing a fuel injector is added so as to prevent departure of the fuel injector when the fuel rail is transferred, assembled, removed, and replaced, while the role and function of a damping member for absorbing a high pressure applied to the fuel injector when the fuel injector injects fuel is maintained, thereby easily replacing the fuel injector.
- the present invention also provides a fuel injector fixing structure of a fuel rail of a vehicle, in which a fuel injector is elastically supported by a damping member and then a fixing member is fixed onto the fuel injector through a via hole formed in the damping member, thereby fixing the fuel injector.
- the present invention also provides a fuel injector fixing structure of a fuel rail of a vehicle, in which, when a mounting lug and an injector holder fixed onto a main pipe are connected by a connection unit, a fixing member for fixing a fuel injector is variously modifiable by fixing a portion of the fixing member onto the fuel injector and fixing another portion of the fixing member onto the connection unit.
- a fuel injector fixing structure of a fuel rail of a vehicle including a main pipe having two ends connected to a plug and an end cap; a plurality of injector holders fixed onto an outer surface of the main pipe at predetermined intervals; a mounting lug disposed adjacent to the injector holder; a fuel injector detachably fixed into the injector holder; a damping member detachably attached to the fuel injector and elastically supporting the fuel injector with respect to the injector holder; and a fixing member for detachably fixing the fuel injector fixing member.
- the fixing member may include a holding part surrounding and attached to an outer surface of the fuel injector; and a fixing part extending upwardly from the holding part and detachably fixed onto the injector holder.
- a fixing groove for fixing the holding part may be formed on the outer surface of the fuel injector.
- the holding part may include a departure prevention part engaged with the outer surface of the fuel injector and for preventing departure of the fixing member from the fuel injector.
- the departure prevention part may be formed as an engaging bump protruding toward a center of the holding part at an end portion of the holding part.
- a step portion may be formed on the injector holder, a fixing hole may be formed in the fixing part, and the fixing hole of the fixing part may be engaged with the step portion.
- the damping member may include a fixing ring engaged with an outer surface of the fuel injector; and a supporting part extending from the fixing ring and having an end portion, which is bent and elastically contacted to the injector holder.
- a via hole corresponding to the fixing groove may be formed in the fixing ring.
- the fixing member may include a holding part surrounding and attached to an outer surface of the fuel injector; and a fixing part extending upwardly from the holding part and detachably fixed onto a connection unit formed between the injector holder and the mounting lug.
- a protrusion may be formed on the connection unit, and a fixing bump engaged with the protrusions may be formed on the fixing part.
- the holding part may include upper and lower members having elasticity and vertically spaced apart from each other by a predetermined distance, a bent part may be formed in at least one of the upper and lower members, and, the holding part is inserted into the fixing groove of the fuel injector as the bent part is deformed.
- a fuel injector is elastically supported by a damping member and is fixed by an additional fixing member, a high pressure applied to the fuel injector when the fuel injector injects fuel may be absorbed and departure of the fuel injector when a fuel rail is transferred, assembled, removed, or replaced may be prevented while the role and function of the damping member is maintained.
- engaging bumps are formed on a holding part of a fixing member for surrounding and fixing a fuel injector, departure of the fixing member from the fuel injector may be prevented.
- a fixing member for fixing a fuel injector may be variously modified by fixing a portion of the fixing member onto the fuel injector and fixing another portion of the fixing member onto the connection unit.
- FIG. 2 is a perspective view showing a fuel injector fixing structure of a fuel rail 100 of a vehicle, according to an embodiment of the present invention.
- FIG. 3 is an exploded perspective view of a main portion of FIG. 2 .
- FIG. 4 is a perspective view of a fixing member 700 in the fuel injector fixing structure illustrated in FIG. 2 .
- the fuel rail 100 includes a main pipe 200, injector holders 300, mounting lugs 400, fuel injectors 500, damping members 600, and fixing members 700.
- the main pipe 200 has a through hole (not shown) formed along a length direction of the main pipe 200, and includes one end fixed to a plug 210 to be connected to a fuel supply pipe and another end fixed to an end cap 220 for blocking one end of the through hole.
- a plurality of injector holders 300 for detachably fixing the fuel injectors 500 to be described below are formed on an outer surface of the main pipe 200 at predetermined intervals so as to be connected to the through hole.
- connection holes connected to the through hole are formed in the outer surface of the main pipe 200, the injector holder 300 is fixed around the connection hole, and thus fuel in the main pipe 200 is supplied to the fuel injector 500 through the injector holder 300.
- the mounting lug 400 for fixing the fuel rail 100 to an engine or a component around the engine is fixed adjacent to the injector holder 300.
- the injector holder 300 and the mounting lug 400 are fixed on the outer surface of the main pipe 200 by using a laser welding or arc welding method.
- the laser welding or arc welding method for fixing the injector holder 300 and the mounting lug 400 is well known, and thus will not be described in detail here.
- the injector holder 300 includes an open lower part into which the fuel injector 500 is detachably inserted and fixed, and has a side via hole connected to the connection hole of the main pipe 200 so as to allow fuel in the main pipe 200 to be supplied to the fuel injector 500 through the injector holder 300.
- the fuel injector 500 internally includes various components such as a value and a valve operating means in order to receive fuel supplied from the main pipe 200 and to inject the fuel into a cylinder.
- the internal structure of the fuel injector 500 is well known, and thus will not be described in detail here.
- the fuel injector 500 mainly includes an insertion part 510 inserted and fixed into the lower part of the injector holder 300, a body part 520 integrally formed with the insertion part 510 and including various components for injecting fuel, and an injection part 530 formed under the body part 520 and exposed toward a combustion chamber of the cylinder in order to inject fuel.
- the fuel injector 500 is supported under the injector holder 300 by the damping member 600 that holds the body part 520 and absorbs a high pressure generated when the fuel injector 500 injects fuel, and is completely fixed by the fixing member 700 that surrounds and fixes an outer circumference of the body part 520 and is engaged and fixed onto the injector holder 300.
- the fuel injector 500 is formed in such a way that a high pressure generated when the fuel injector 500 injects fuel is absorbed by the damping member 600 and that departure of the fuel injector 500 from the injector holder 300 is prevented by the fixing member 700.
- the damping member 600 includes a fixing ring 610 engaged with an outer surface of the fuel injector 500, and a supporting part 620 extending upwardly from the fixing ring 610 and including upper portions bent and elastically contacted to the injector holder 300.
- the damping member 600 may be formed of an elastic material capable of absorbing an impact caused by a high pressure generated when the fuel injector 500 injects fuel, while the supporting parts 620 elastically contacted to the injector holder 300 and supported under the injector holder 300 are bent due to the impact and then are restored to their original state.
- the fixing member 700 includes a holding part 710 surrounding and attached to the outer surface of the fuel injector 500, and a fixing part 720 extending upwardly from the holding part 710 and detachably fixed onto the injector holder 300.
- the holding part 710 is formed in a "C" shape having a side opening, is engaged around an outer surface of the body part 520 of the fuel injector 500, and includes a departure prevention part 730 engaged with the outer surface of the fuel injector 500, i.e., the body part 520, so as to prevent departure of the holding part 710, at end portions of the holding part 710.
- the departure prevention part 730 is formed as an engaging bump at the end portion of the holding part 710, and the engaging bumps are formed by partially cutting the end portion of the holding part 710 so as to protrude toward the center of the holding part 710.
- the holding part 710 is formed in a ring shape having an opening, and includes cuts 711 formed at the end portions of the holding part 710, and the engaging bumps formed at end portions of the cuts 711 and protruding toward the center of the holding part 710.
- the fixing part 720 extends upwardly from the holding part 710, has an almost " ⁇ "-shaped fixing hole, and is engaged with a step portion 310 formed on the injector holder 300.
- the step portion 310 of the injector holder 300 may be formed between a flat part 311 formed by vertically cutting a portion of the injector holder 300, and a curved part 312 remaining at a lower portion of the injector holder 300 to a certain height.
- the holding part 710 of the fixing member 700 is inserted and fixed into a fixing groove 540 formed on the body part 520 of the fuel injector 500.
- the fixing groove 540 is connected to a via hole 611 formed in the fixing ring 610 of the damping member 600, when the fixing member 700 is fixed onto the body part 520.
- the via hole 611 is formed in the fixing ring 610 of the damping member 600 such that the holding part 710 of the fixing member 700 is fixed onto the body part 520 by the fixing ring 610 while the fixing ring 610 of the damping member 600 is fixed onto the body part 520 of the fuel injector 500.
- the fuel injector 500 is formed in such a way that the holding part 710 of the fixing member 700 is passed through the via hole 611 of the damping member 600 and is inserted and fixed into the fixing groove 540 of the body part 520 while the damping member 600 is fixed onto the body part 520 and supports the fuel injector 500 with respect to the injector holder 300.
- the fixing ring 610 of the damping member 600 may be formed to surround and fix a lower portion of the fixing groove 540 of the fuel injector 500.
- FIG. 5 shows a fuel injector fixing structure of the fuel rail 100 when the injector holder 300 and the mounting lug 400 are connected to each other by a connection unit 350, according to another embodiment of the present invention.
- the injector holder 300 and the mounting lug 400 are connected by the connection unit 350, and protrusions 351 are formed at two sides of the connection unit 350.
- connection unit 350 is formed between the injector holder 300 and the mounting lug 400, as illustrated in FIG. 6 , another fixing member 700' is used to fix the fuel injector 500 to the connection unit 350.
- the fixing member 700' includes a holding part 710' surrounding and attached to the fuel injector 500, and a fixing part 720' extending upwardly from the holding part 710' and fixed to the connection unit 350 formed between the injector holder 300 and the mounting lug 400.
- the holding part 710' of the fixing member 700' is the same as the holding part 710 of the fixing member 700 illustrated in FIG. 4 , and thus will not be described in detail here.
- the fixing part 720' is formed in a "U" shape having a top opening, and includes fixing bumps 721' formed at an upper portion of the fixing part 720' so as to be engaged and fixed onto the protrusions 351 formed at a lower portion of the connection unit 350.
- the fuel injector 500 may be completely fixed by engaging the fixing bumps 721' of the fixing part 720' of the fixing member 700' onto the protrusions 351 while the holding part 710' of the fixing member 700' is engaged onto the body part 520.
- a holding part 710" of a fixing member 700" includes upper and lower members 711" and 712" having elasticity, facing each other, and vertically spaced apart from each other by a predetermined distance.
- a bent part 713" is formed in one of the upper and lower members 711” and 712", and the holding part 710" is inserted into the fixing groove 540 of the fuel injector 500 as the bent part 713" is deformed.
- the fixing part 720 of the fixing member 700 or the fixing part 720' of the fixing member 700' may be selected and used.
- the end cap 220 and the plug 210 are individually fixed onto two ends of the main pipe 200 of the fuel rail 100 by using a brazing method.
- the brazing method for fixing the end cap 220 and the plug 210 onto the main pipe 200 will not be described in detail here.
- a plurality of injector holders 300 and a plurality of mounting lugs 400 are welded and fixed onto an outer surface of the main pipe 200.
- the insertion part 510 of the fuel injector 500 is inserted into an open lower portion of the injector holder 300.
- the fixing ring 610 of the damping member 600 is placed under the injection part 530 of the fuel injector 500 and then is raised to be fixed around the body part 520 of the fuel injector 500 such that the supporting parts 620 of the damping member 600 contact and are supported under the injector holder 300.
- the fuel injector 500 may also be fixed into the injector holder 300 after the damping member 600 is fixed onto the fuel injector 500.
- the fuel injector 500 is fixed by the fixing member 700 and thus is detachably and completely fixed into the injector holder 300.
- the fuel injector 500 is completely fixed by inserting and fixing the holding part 710 of the fixing member 700 into the fixing groove 540 of the fuel injector 500, and then engaging the fixing part 720 of the fixing member 700 with the step portion 310 of the injector holder 300.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
- The present invention relates to a fuel rail of a vehicle, and more particularly, to a fuel injector fixing structure of a fuel rail of a vehicle, capable of fixing fuel injectors for injecting fuel into cylinders onto a main pipe of the fuel rail at predetermined intervals by using additional fixing members, so as to sufficiently absorbing a high pressure applied to the fuel injectors when the fuel injectors inject fuel and to appropriately replace the fuel injectors.
- In general, gasoline engines mainly include indirect multi point injection (MPI) engines and port fuel injection (PFI) engines.
- However, exhaust gas regulations currently tightened to prevent global warming and air pollution may not be satisfied by using only indirect MPI engines.
- In order to satisfy such exhaust gas regulations, gasoline direct injection (GDI) engines capable of directly injecting fuel into engine cylinders as in diesel engines have been developed.
- Although a gasoline indirect MPI engine has a fuel injection pressure of only 4 to 5bar, a GDI engine requires a fuel injection pressure of about 120 to 200bar.
- A GDI engine includes a fuel rail including a plurality of fuel injectors for receiving fuel supplied from a fuel tank and for injecting the fuel.
- Meanwhile, in a GDI engine, since a high fuel pressure and a combustion pressure in combustion chambers of cylinders are directly applied to fuel injectors of a fuel rail when the fuel injectors directly injects fuel into the combustion chambers, the pressures should be absorbed to prevent impacts applied to the fuel injectors toward the fuel rails.
- A
conventional fuel rail 10 having the above-described structure is illustrated inFIG. 1 . - As illustrated in
FIG. 1 , in theconventional fuel rail 10, a plurality ofmounting lugs 30 andinjector holders 40 are fixed onto amain pipe 20 at predetermined intervals, andfuel injectors 50 are detachably fixed into theinjector holders 40, and the pressure applied tofuel injectors 50 is absorbed by dampingmembers 60. - The
mounting lugs 30 and theinjector holders 40 are welded and fixed onto an outer surface of themain pipe 20, correspond to the number of cylinders included in an engine, and fix thefuel injectors 50 for injecting fuel into the cylinders. - The
fuel injectors 50 are inserted and fixed into lower portions of theinjector holders 40, and each includes an insertion part formed at an upper portion of thefuel injector 50 and inserted into theinjector holder 40, and an injection part formed at a lower portion of thefuel injector 50 and for injecting fuel. A connection unit connected to a power source is formed at a side of thefuel injector 50. - Each of the damping
members 60 mainly includes a fixing part surrounding and fixing thefuel injector 50, and damping parts integrally formed at a side of the fixing part, having elasticity, and absorbing the pressures transferred from thefuel injector 50. - That is, a high pressure generated when the
fuel injector 50 injects fuel is absorbed by the dampingmember 60 such that an impact applied to thefuel injector 50 toward thefuel rail 10 is prevented. - In the above-described
conventional fuel rail 10, thedamping member 60 for fixing thefuel injector 50 is fixed onto a body part of thefuel injector 50 before being elastically supported under theinjector holder 40, and absorbs a high pressure applied to thefuel injector 50 when thefuel injectors 50 injects fuel. - However, in order to maintain the form and function of the
damping member 60 for preventing an impact caused by a fuel injection pressure and a combustion pressure, a space for fixing thefuel injector 50 onto themain pipe 20 of thefuel rail 10 may be insufficient. As such, when a product is transferred, assembled, removed, or replaced, thefuel injector 50 may be departed from theinjector holder 40. - The present invention provides a fuel injector fixing structure of a fuel rail of a vehicle, in which an additional fixing member for fixing a fuel injector is added so as to prevent departure of the fuel injector when the fuel rail is transferred, assembled, removed, and replaced, while the role and function of a damping member for absorbing a high pressure applied to the fuel injector when the fuel injector injects fuel is maintained, thereby easily replacing the fuel injector.
- The present invention also provides a fuel injector fixing structure of a fuel rail of a vehicle, in which a fuel injector is elastically supported by a damping member and then a fixing member is fixed onto the fuel injector through a via hole formed in the damping member, thereby fixing the fuel injector.
- The present invention also provides a fuel injector fixing structure of a fuel rail of a vehicle, in which, when a mounting lug and an injector holder fixed onto a main pipe are connected by a connection unit, a fixing member for fixing a fuel injector is variously modifiable by fixing a portion of the fixing member onto the fuel injector and fixing another portion of the fixing member onto the connection unit.
- According to an aspect of the present invention, there is provided a fuel injector fixing structure of a fuel rail of a vehicle, including a main pipe having two ends connected to a plug and an end cap; a plurality of injector holders fixed onto an outer surface of the main pipe at predetermined intervals; a mounting lug disposed adjacent to the injector holder; a fuel injector detachably fixed into the injector holder; a damping member detachably attached to the fuel injector and elastically supporting the fuel injector with respect to the injector holder; and a fixing member for detachably fixing the fuel injector fixing member.
- The fixing member may include a holding part surrounding and attached to an outer surface of the fuel injector; and a fixing part extending upwardly from the holding part and detachably fixed onto the injector holder.
- A fixing groove for fixing the holding part may be formed on the outer surface of the fuel injector.
- The holding part may include a departure prevention part engaged with the outer surface of the fuel injector and for preventing departure of the fixing member from the fuel injector.
- The departure prevention part may be formed as an engaging bump protruding toward a center of the holding part at an end portion of the holding part.
- A step portion may be formed on the injector holder, a fixing hole may be formed in the fixing part, and the fixing hole of the fixing part may be engaged with the step portion.
- The damping member may include a fixing ring engaged with an outer surface of the fuel injector; and a supporting part extending from the fixing ring and having an end portion, which is bent and elastically contacted to the injector holder.
- A via hole corresponding to the fixing groove may be formed in the fixing ring.
- The fixing member may include a holding part surrounding and attached to an outer surface of the fuel injector; and a fixing part extending upwardly from the holding part and detachably fixed onto a connection unit formed between the injector holder and the mounting lug.
- A protrusion may be formed on the connection unit, and a fixing bump engaged with the protrusions may be formed on the fixing part.
- The holding part may include upper and lower members having elasticity and vertically spaced apart from each other by a predetermined distance, a bent part may be formed in at least one of the upper and lower members, and, the holding part is inserted into the fixing groove of the fuel injector as the bent part is deformed.
- According to the present invention, since a fuel injector is elastically supported by a damping member and is fixed by an additional fixing member, a high pressure applied to the fuel injector when the fuel injector injects fuel may be absorbed and departure of the fuel injector when a fuel rail is transferred, assembled, removed, or replaced may be prevented while the role and function of the damping member is maintained.
- Also, since engaging bumps are formed on a holding part of a fixing member for surrounding and fixing a fuel injector, departure of the fixing member from the fuel injector may be prevented.
- Furthermore, when a mounting lug and an injector holder are connected by a connection unit and are integrally fixed onto a main pipe, a fixing member for fixing a fuel injector may be variously modified by fixing a portion of the fixing member onto the fuel injector and fixing another portion of the fixing member onto the connection unit.
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FIG. 1 is a perspective view of a conventional fuel rail. -
FIG. 2 is a perspective view showing a fuel injector fixing structure of a fuel rail of a vehicle, according to an embodiment of the present invention. -
FIG. 3 is an exploded perspective view of a main portion ofFIG. 2 . -
FIG. 4 is a perspective view of a fixing member in the fuel injector fixing structure illustrated inFIG. 2 . -
FIG. 5 is a perspective view of another fixing member in the fuel injector fixing structure illustrated inFIG. 2 . -
FIG. 6 is a side cross-sectional view showing a fixed state of the fixing member in the fuel injector fixing structure illustrated inFIG. 5 . -
FIG. 7 is a perspective view of the fixing member in the fuel injector fixing structure illustrated inFIG. 5 . -
FIG. 8 is a perspective view of another fixing member in the fuel injector fixing structure illustrated inFIG. 5 . - Hereinafter, the present invention will be described in detail by explaining embodiments of the invention with reference to the attached drawings. In the drawings, the thicknesses of lines or the sizes of elements may be exaggerated for clarity and convenience of explanation. Also, the terms used in the specification are defined in consideration of functions used in the present invention, and can be changed according to the intent or conventionally used methods of operators and users. Accordingly, definitions of the terms should be understood on the basis of the entire description of the present specification.
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FIG. 2 is a perspective view showing a fuel injector fixing structure of afuel rail 100 of a vehicle, according to an embodiment of the present invention.FIG. 3 is an exploded perspective view of a main portion ofFIG. 2 .FIG. 4 is a perspective view of afixing member 700 in the fuel injector fixing structure illustrated inFIG. 2 . - As illustrated in
FIGS. 2 ,3 , and4 , thefuel rail 100 includes amain pipe 200,injector holders 300,mounting lugs 400,fuel injectors 500, dampingmembers 600, and fixingmembers 700. - The
main pipe 200 has a through hole (not shown) formed along a length direction of themain pipe 200, and includes one end fixed to aplug 210 to be connected to a fuel supply pipe and another end fixed to anend cap 220 for blocking one end of the through hole. - A plurality of
injector holders 300 for detachably fixing thefuel injectors 500 to be described below are formed on an outer surface of themain pipe 200 at predetermined intervals so as to be connected to the through hole. - That is, connection holes connected to the through hole are formed in the outer surface of the
main pipe 200, theinjector holder 300 is fixed around the connection hole, and thus fuel in themain pipe 200 is supplied to thefuel injector 500 through theinjector holder 300. - Also, the
mounting lug 400 for fixing thefuel rail 100 to an engine or a component around the engine is fixed adjacent to theinjector holder 300. - Here, the
injector holder 300 and themounting lug 400 are fixed on the outer surface of themain pipe 200 by using a laser welding or arc welding method. The laser welding or arc welding method for fixing theinjector holder 300 and themounting lug 400 is well known, and thus will not be described in detail here. - The
injector holder 300 includes an open lower part into which thefuel injector 500 is detachably inserted and fixed, and has a side via hole connected to the connection hole of themain pipe 200 so as to allow fuel in themain pipe 200 to be supplied to thefuel injector 500 through theinjector holder 300. - The
fuel injector 500 internally includes various components such as a value and a valve operating means in order to receive fuel supplied from themain pipe 200 and to inject the fuel into a cylinder. The internal structure of thefuel injector 500 is well known, and thus will not be described in detail here. - The
fuel injector 500 mainly includes aninsertion part 510 inserted and fixed into the lower part of theinjector holder 300, abody part 520 integrally formed with theinsertion part 510 and including various components for injecting fuel, and aninjection part 530 formed under thebody part 520 and exposed toward a combustion chamber of the cylinder in order to inject fuel. - The
fuel injector 500 is supported under theinjector holder 300 by the dampingmember 600 that holds thebody part 520 and absorbs a high pressure generated when thefuel injector 500 injects fuel, and is completely fixed by the fixingmember 700 that surrounds and fixes an outer circumference of thebody part 520 and is engaged and fixed onto theinjector holder 300. - That is, the
fuel injector 500 is formed in such a way that a high pressure generated when thefuel injector 500 injects fuel is absorbed by the dampingmember 600 and that departure of thefuel injector 500 from theinjector holder 300 is prevented by the fixingmember 700. - Here, the damping
member 600 includes a fixingring 610 engaged with an outer surface of thefuel injector 500, and a supportingpart 620 extending upwardly from the fixingring 610 and including upper portions bent and elastically contacted to theinjector holder 300. - The damping
member 600 may be formed of an elastic material capable of absorbing an impact caused by a high pressure generated when thefuel injector 500 injects fuel, while the supportingparts 620 elastically contacted to theinjector holder 300 and supported under theinjector holder 300 are bent due to the impact and then are restored to their original state. - Also, the fixing
member 700 includes a holdingpart 710 surrounding and attached to the outer surface of thefuel injector 500, and a fixingpart 720 extending upwardly from the holdingpart 710 and detachably fixed onto theinjector holder 300. - The holding
part 710 is formed in a "C" shape having a side opening, is engaged around an outer surface of thebody part 520 of thefuel injector 500, and includes adeparture prevention part 730 engaged with the outer surface of thefuel injector 500, i.e., thebody part 520, so as to prevent departure of the holdingpart 710, at end portions of the holdingpart 710. - Here, the
departure prevention part 730 is formed as an engaging bump at the end portion of the holdingpart 710, and the engaging bumps are formed by partially cutting the end portion of the holdingpart 710 so as to protrude toward the center of the holdingpart 710. - Also, the holding
part 710 is formed in a ring shape having an opening, and includescuts 711 formed at the end portions of the holdingpart 710, and the engaging bumps formed at end portions of thecuts 711 and protruding toward the center of the holdingpart 710. - Furthermore, the fixing
part 720 extends upwardly from the holdingpart 710, has an almost "□"-shaped fixing hole, and is engaged with astep portion 310 formed on theinjector holder 300. - The
step portion 310 of theinjector holder 300 may be formed between aflat part 311 formed by vertically cutting a portion of theinjector holder 300, and acurved part 312 remaining at a lower portion of theinjector holder 300 to a certain height. - Also, the holding
part 710 of the fixingmember 700 is inserted and fixed into a fixinggroove 540 formed on thebody part 520 of thefuel injector 500. The fixinggroove 540 is connected to a viahole 611 formed in the fixingring 610 of the dampingmember 600, when the fixingmember 700 is fixed onto thebody part 520. - Meanwhile, the via
hole 611 is formed in the fixingring 610 of the dampingmember 600 such that the holdingpart 710 of the fixingmember 700 is fixed onto thebody part 520 by the fixingring 610 while the fixingring 610 of the dampingmember 600 is fixed onto thebody part 520 of thefuel injector 500. - That is, the
fuel injector 500 is formed in such a way that the holdingpart 710 of the fixingmember 700 is passed through the viahole 611 of the dampingmember 600 and is inserted and fixed into the fixinggroove 540 of thebody part 520 while the dampingmember 600 is fixed onto thebody part 520 and supports thefuel injector 500 with respect to theinjector holder 300. - As described above, since the holding
part 710 of the fixingmember 700 is fixed into the fixinggroove 540 of thefuel injector 500 through the viahole 611 formed in the fixingring 610 of the dampingmember 600 fixed onto thebody part 520, departure of the dampingmember 600 from thefuel injector 500 is prevented. - Alternatively, the fixing
ring 610 of the dampingmember 600 may be formed to surround and fix a lower portion of the fixinggroove 540 of thefuel injector 500. - Meanwhile,
FIG. 5 shows a fuel injector fixing structure of thefuel rail 100 when theinjector holder 300 and the mountinglug 400 are connected to each other by aconnection unit 350, according to another embodiment of the present invention. - As illustrated in
FIG. 5 , theinjector holder 300 and the mountinglug 400 are connected by theconnection unit 350, andprotrusions 351 are formed at two sides of theconnection unit 350. - If the
connection unit 350 is formed between theinjector holder 300 and the mountinglug 400, as illustrated inFIG. 6 , another fixing member 700' is used to fix thefuel injector 500 to theconnection unit 350. - As illustrated in
FIG. 7 , the fixing member 700' includes a holding part 710' surrounding and attached to thefuel injector 500, and a fixing part 720' extending upwardly from the holding part 710' and fixed to theconnection unit 350 formed between theinjector holder 300 and the mountinglug 400. - Here, the holding part 710' of the fixing member 700' is the same as the holding
part 710 of the fixingmember 700 illustrated inFIG. 4 , and thus will not be described in detail here. - The fixing part 720' is formed in a "U" shape having a top opening, and includes fixing bumps 721' formed at an upper portion of the fixing part 720' so as to be engaged and fixed onto the
protrusions 351 formed at a lower portion of theconnection unit 350. - That is, the
fuel injector 500 may be completely fixed by engaging the fixing bumps 721' of the fixing part 720' of the fixing member 700' onto theprotrusions 351 while the holding part 710' of the fixing member 700' is engaged onto thebody part 520. - Also, as illustrated in
FIG. 8 , a holdingpart 710" of a fixingmember 700" includes upper andlower members 711" and 712" having elasticity, facing each other, and vertically spaced apart from each other by a predetermined distance. Abent part 713" is formed in one of the upper andlower members 711" and 712", and the holdingpart 710" is inserted into the fixinggroove 540 of thefuel injector 500 as thebent part 713" is deformed. Here, as a fixingpart 720", the fixingpart 720 of the fixingmember 700 or the fixing part 720' of the fixing member 700' may be selected and used. - Operation of the above-described
fuel rail 100 will now be described in brief. - Initially, the
end cap 220 and theplug 210 are individually fixed onto two ends of themain pipe 200 of thefuel rail 100 by using a brazing method. Here, the brazing method for fixing theend cap 220 and theplug 210 onto themain pipe 200 will not be described in detail here. - Then, a plurality of
injector holders 300 and a plurality of mountinglugs 400 are welded and fixed onto an outer surface of themain pipe 200. - After that, the
insertion part 510 of thefuel injector 500 is inserted into an open lower portion of theinjector holder 300. Then, the fixingring 610 of the dampingmember 600 is placed under theinjection part 530 of thefuel injector 500 and then is raised to be fixed around thebody part 520 of thefuel injector 500 such that the supportingparts 620 of the dampingmember 600 contact and are supported under theinjector holder 300. - Here, the
fuel injector 500 may also be fixed into theinjector holder 300 after the dampingmember 600 is fixed onto thefuel injector 500. - As described above, since the
fuel injector 500 is elastically supported by the dampingmember 600, an impact applied to thefuel injector 500 toward themain pipe 200 due to a high pressure generated when thefuel injector 500 injects fuel may be efficiently reduced and prevented. - Then, the
fuel injector 500 is fixed by the fixingmember 700 and thus is detachably and completely fixed into theinjector holder 300. - That is, the
fuel injector 500 is completely fixed by inserting and fixing the holdingpart 710 of the fixingmember 700 into the fixinggroove 540 of thefuel injector 500, and then engaging the fixingpart 720 of the fixingmember 700 with thestep portion 310 of theinjector holder 300. - As such, since the
fuel injector 500 is completely fixed into theinjector holder 300 by the additional fixingmember 700, departure of thefuel injector 500 from theinjector holder 300 when thefuel rail 100 is used, transferred, assembled, or replaced may be prevented. - While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by one of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (10)
- A fuel injector fixing structure of a fuel rail of a vehicle, comprising:a main pipe having two ends connected to a plug and an end cap;a plurality of injector holders fixed onto an outer surface of the main pipe at predetermined intervals;a mounting lug disposed adjacent to the injector holder;a fuel injector detachably fixed into the injector holder;a damping member detachably attached to the fuel injector and elastically supporting the fuel injector with respect to the injector holder; anda fixing member for detachably fixing the fuel injector onto the injector holder.
- The fuel injector fixing structure of claim 1, wherein the fixing member comprises a holding part surrounding and attached to an outer surface of the fuel injector, and a fixing part extending upwardly from the holding part and detachably fixed onto the injector holder, and wherein a fixing groove for fixing the holding part is formed on the outer surface of the fuel injector.
- The fuel injector fixing structure of claim 2, wherein the holding part comprises a departure prevention part, which is engaged with the outer surface of the fuel injector, for preventing departure of the fixing member from the fuel injector.
- The fuel injector fixing structure of claim 3, wherein the departure prevention part is formed as a engaging bump protruding toward a center of the holding part at an end portion of the holding part.
- The fuel injector fixing structure of claim 2, wherein a step portion is formed on the injector holder, wherein a fixing hole is formed in the fixing part, and wherein the fixing hole of the fixing part is engaged with the step portion.
- The fuel injector fixing structure of claim 3, wherein the damping member comprises:a fixing ring engaged with an outer surface of the fuel injector; anda supporting part extending from the fixing ring and having an end portion, which is bent and elastically contacted to the injector holder.
- The fuel injector fixing structure of claim 6, wherein a via hole corresponding to the fixing groove is formed in the fixing ring.
- The fuel injector fixing structure of claim 1, wherein the fixing member comprises a holding part surrounding and attached to an outer surface of the fuel injector, and a fixing part extending upwardly from the holding part and detachably fixed onto a connection unit formed between the injector holder and the mounting lug, and wherein a fixing groove for fixing the holding part is formed in the outer surface of the fuel injector.
- The fuel injector fixing structure of claim 8, wherein a protrusion is formed on the connection unit, and wherein a fixing bump engaged with the protrusions is formed on the fixing part.
- The fuel injector fixing structure of claim 2 or 8, wherein the holding part comprises upper and lower members having elasticity and vertically spaced apart from each other by a predetermined distance, wherein a bent part is formed in at least one of the upper and lower members, and wherein the holding part is inserted into the fixing groove of the fuel injector as the bent part is deformed.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020110017424A KR101199642B1 (en) | 2011-02-25 | 2011-02-25 | Fuel injector fixing structure of fuel rail for vehicle |
Publications (2)
Publication Number | Publication Date |
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EP2492489A1 true EP2492489A1 (en) | 2012-08-29 |
EP2492489B1 EP2492489B1 (en) | 2015-07-08 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12156854.7A Active EP2492489B1 (en) | 2011-02-25 | 2012-02-24 | Fuel injector fixing structure of a fuel injection valve of a common rail of a vehicle |
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EP (1) | EP2492489B1 (en) |
KR (1) | KR101199642B1 (en) |
Cited By (8)
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US20130220277A1 (en) * | 2012-02-27 | 2013-08-29 | Keihin Corporation | Fuel injection valve supporting structure |
US20130220276A1 (en) * | 2012-02-27 | 2013-08-29 | Keihin Corporation | Fuel injection valve supporting structure |
US20140123952A1 (en) * | 2012-11-05 | 2014-05-08 | Keihin Corporation | Support structure for fuel injection valve |
JP2015034533A (en) * | 2013-08-09 | 2015-02-19 | マルヤス工業株式会社 | High pressure fuel delivery pipe for direct-injection engine |
EP2896817A1 (en) * | 2014-01-15 | 2015-07-22 | Robert Bosch Gmbh | Fuel injection system with a fuel conveying component, a fuel injector valve and a connector |
US9938948B2 (en) | 2013-10-10 | 2018-04-10 | Continental Automotive Gmbh | Fluid injection assembly for a combustion engine |
CN107965407A (en) * | 2016-10-19 | 2018-04-27 | 东宝株式会社 | The structure of GDI fuel rails |
US10047712B2 (en) | 2013-07-31 | 2018-08-14 | Continental Automotive Gmbh | Fluid injection assembly for a combustion engine |
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US20130220276A1 (en) * | 2012-02-27 | 2013-08-29 | Keihin Corporation | Fuel injection valve supporting structure |
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US10047712B2 (en) | 2013-07-31 | 2018-08-14 | Continental Automotive Gmbh | Fluid injection assembly for a combustion engine |
JP2015034533A (en) * | 2013-08-09 | 2015-02-19 | マルヤス工業株式会社 | High pressure fuel delivery pipe for direct-injection engine |
US9938948B2 (en) | 2013-10-10 | 2018-04-10 | Continental Automotive Gmbh | Fluid injection assembly for a combustion engine |
EP2896817A1 (en) * | 2014-01-15 | 2015-07-22 | Robert Bosch Gmbh | Fuel injection system with a fuel conveying component, a fuel injector valve and a connector |
CN107965407A (en) * | 2016-10-19 | 2018-04-27 | 东宝株式会社 | The structure of GDI fuel rails |
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Also Published As
Publication number | Publication date |
---|---|
KR20120097887A (en) | 2012-09-05 |
KR101199642B1 (en) | 2012-11-08 |
EP2492489B1 (en) | 2015-07-08 |
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