CA1188171A - Mounting device for fuel injection nozzles for internal combustion engines - Google Patents
Mounting device for fuel injection nozzles for internal combustion enginesInfo
- Publication number
- CA1188171A CA1188171A CA000414742A CA414742A CA1188171A CA 1188171 A CA1188171 A CA 1188171A CA 000414742 A CA000414742 A CA 000414742A CA 414742 A CA414742 A CA 414742A CA 1188171 A CA1188171 A CA 1188171A
- Authority
- CA
- Canada
- Prior art keywords
- hole
- fuel injection
- seal
- mounting
- engine
- 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.)
- Expired
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 99
- 238000002347 injection Methods 0.000 title claims abstract description 63
- 239000007924 injection Substances 0.000 title claims abstract description 63
- 238000002485 combustion reaction Methods 0.000 title description 3
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 238000002955 isolation Methods 0.000 abstract description 6
- 230000004308 accommodation Effects 0.000 abstract 1
- 229940090044 injection Drugs 0.000 description 38
- 238000009826 distribution Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 241000283986 Lepus Species 0.000 description 1
- 102100026933 Myelin-associated neurite-outgrowth inhibitor Human genes 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A device for mounting fuel injection systems and particularly fuel injection nozzles and a fuel supply manifold.
The device includes U-shaped structures having coaxial, spaced holes into which are mounted fuel injection nozzles. The fuel supply manifold is fixed to the structure such that it is in alignment with the nozzles to provide fuel thereto. The nozzles are mounted and sealed by resilient members positioned and compressed within the coaxial holes to provide vibration isolation, thermal isolation and accommodation of dimensional control anomolies in what is therefore allowed to be crudely fabricated components.
A device for mounting fuel injection systems and particularly fuel injection nozzles and a fuel supply manifold.
The device includes U-shaped structures having coaxial, spaced holes into which are mounted fuel injection nozzles. The fuel supply manifold is fixed to the structure such that it is in alignment with the nozzles to provide fuel thereto. The nozzles are mounted and sealed by resilient members positioned and compressed within the coaxial holes to provide vibration isolation, thermal isolation and accommodation of dimensional control anomolies in what is therefore allowed to be crudely fabricated components.
Description
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SPECIFICATION
MOUNTING DEVICE FOR FUEL INJECTION NOZZLES
FO~ INTERNAL COMBUSTION ENGINES
1,~
BACKGROUND OF THE DISCLOSURE i The field of the present invention is fuel injection systems, and more particularly, devices for mounting injector nozzles for such fuel injection systems.
Fuel injection systems generally employ nozzles which are fixed relative to the engine at either the intake manifold ; lO or the cylinder head to direct fuel received from a fuel distribution line toward the intake of the engine cylinders at appropriately timed intervals. Such nozzles are usually comprised of a solenoid valve arranged to inject in an intermit- ¦
tent manner the fuel supplied thereto through the fuel distri-bution line. The nozzle is directed to provide fuel toward the combustion chamber in the engine cylinder, often indirectly via the intake manifold.
Mounting devices for mounting injector nozzles on engines have previously been employed which include a pipe joint such as a nipple for joining the injection nozzle to the fuel distribution line and a means for directly affixing the nozzle to an engine element such as the cylinder head or the intake manifold. Such mounting devices often require close machining tolerances and close mountiny tolerances in order to maintain an appropriate seal at the joints between the injec-tion nozzles and the fuel distribution line and also betweenthe injection noæzles and the engine.
'I'he requiremen-t :for close to:lerances and effective seals is often -the result o:f the difficul-t environmen-t in which injection nozzle is located. T}le nozzle i.tself vibra-tes during the injecting operation. This vib:ra-tion is transmitted to the joints with -the engine and ~ith the fue]. distribution line causing undesirable looseni.ng o~ -the joints. Fuel is thus able to leak between componen-ts. Fur-thermore, with standard mounting systems, the injec-tion nozzle as we:ll as the fuel distribu-tion line can easily become overhea-ted from -the engine. This is parti.cularly true in a counterflow type engine in which the intake manifolcl is arranged above the exhaust manifold where heat convection adds to the adverse thermal environment. As a result, the fuel may par-tially vaporize to create adverse operating conditions.
SUMMARY OF THE INVENTION
The present invention is directed to an improved device for mounting a fuel injection system to an engine.
According to one aspect of the inven-tion there is provided a device for mounting fuel injection nozzles and a fuel supply manifold for the nozzles to an enginet -the nozzles each being of a type having upper and lower mounting surfaces perpendicular to the axis of the nozzle, comprising a mounting structure having first and second coaxial, spaced holes for receipt of one fuel injection nozzle -therein;
first attachment means for fixing said mounting structure to the engine;
second attachment means for fixing the fuel supply manifold to said mounting structure;
first and second seals posi-tioned in said first and second holes respectively on the lower and upper mounting surfaces of the nozzle, said mountirlg structure being sized to 7.~
cornpress said seals hetween -the ~uel supply manifold and -the engine when assembled therewi-th.
Accorcling -to ano-ther aspec-t oE the inven-tion -there is provided a device for moun-ting Eue:l injection nozzles and a fuel supply mani.fold for the nozzles to an engine, the nozzles each being of a type having upper and lowe:r mount.ing surfaces perpendicular ~o the axis of -the nozzle, comprising a mounting structure inc:Lucling a base capable of being fixed -to -the engine, an ups-tanding body fixed -to saicl base, and a mounting flange fixed to said body and ex-tend.ing parallel to and spaced from said base, said base and said flange having firs-t and second aligned holes respectively for receipt of one fuel injection nozzle;
a-ttachment means for fixing the fuel suppor-t manifold at said second hole on said flange;
first and second seals positioned in said firs-t and second holes respectively on the lower and upper mounting surfaces of the nozzle, said mounting structure being sized to compress said seals between the fuel supply manifold and the engine when assembled -therewith.
According to a fur-ther aspect of the invention there is provided a device for mounting a fuel injection system to an engine, comprising in combination at least one fuel injection nozzle, each said fuel injec-tion nozz:Le including an elongate body having a first end for injecting fuel into an engine, a second end for receiving fuel, a first rnoun-ting surface adjacent said first end and a second mounting surface adjacent saicl second end, said mounting surfaces being perpendicular to the axis of said nozzle and 0 facing away from the center of said nozzle;
a mounting struc-ture including a base capable of being :Eixed -to the engine, an upstanding body fixed to said hase, anc. a moun-ting flange fixed -to saicl bocdy and extending parallel to and spaced from said base, saicl base and said flange having first and second aligned holes respectively for receipt of one said fuel injection nozzle, said first end being positioned in said first hole and said second end being posi-tioned in said second hole;
a fuel supply manifold posi-tioned on said mounting flange in communication with said second hole;
firs-t and second seals positioned in said firs-t and second holes respectively on the fi.rst and second mounting surfaces of one said nozzle, said moun-ting structure being sized to compress said seals between said fuel supply manifold and the engine when assembled therewith.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a top plan view illustrating a mounting device for fuel injection nozzles on an engine, according to one embodiment of the present invention.
Figure 2 is a fragmentary vertical sectional view taken along line 2-2 of F'igure 1.
Figure 3 is a front view illustrating a mounting struc-ture forming part of the device of Figure 1.
Figure 4 is a fragmentary side view, partially broken away, illustrating the mounting of a fuel injection nozzle.
Figure 5 is a cross-sec-tional view illustrating a firs-t sealing member forming part of the device of Figure 1.
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163/2g5 Figure 6 is a cross-sectional elevation in detail of a seal ring in a deformed state but without the sealing ring or washer of the device of Figure 43 Figure 7 is a fragmentary side view~ partially broken away, illustrating a second embodiment of the device of Figure 1.
Figure 8 is a fragmentary side view, partially broken away, illustrating an additional modification of the device of Figure 1.
Figure 9 is a top plan view illustrating the device of Figure 8.
Figure 10 is a fragmentary vertical sectional view taken along line 10-10 of Figure 9.
DETAILED DESCRIPTION OF THE PREFERRED EMsoDIMENT
.
A device is disclosed for the mounting of fuel injection nozzles and a uel supply manifold for the injection nozzles on an engine. A first embodiment of this device is illustrated in Figures l~S. Specifically in Figures 1 and 2, the device of the present invention is illustrated in associa-tion with an engine. The engine is illustrated as employing a cylinder head 10, an intake manifold 12, an intake system 14 and a cylinder block 16 in a substantially conventional arrange-ment. A four-cylinder engine is illustrated with the intake passages in Figure 1 illustrated in broken lineO A fuel injectlon nozzle port 18 is illustrated as extending through the intake manifold 12 and partially throuyh the cylinder housing 10. Naturally, this port may be rearranged to accommo-date the characteristic of the particular injection system. An extended boss 20 provides a mounting surface on the engine for the injector system. Naturally, this provision for mounting of '7~ 163/2g5 the injector system rnay be provided on the intake manifold, the cylinder head or elsewhere on the engine where convenient.
A fuel supply maniold system is illustrated for supplying pressurized fuel to the injectors. This manifold includes a pipe 22 directing fuel t:o individual fuel passages 24 contained within fixtures 26. Four such passages 24 are provided in four fixtures 26 to serve each of the four cylinders in the present embodiment.
The fuel injection nozzles 28, as can best be seen in Figure 4 are of the type having a passageway 30 extending therethroughO This passageway is controlled by a solenoid valve contained within the nozzle 28 which may be electrically energized and de-energized by a conventional driving circuit.
Through the operation of the solenoid valve, fuel from the pressurized pipe 22 is appropriately injected on an intermit-tent basis into the engine~
The physical structure of each nozzle includes a main body portion 32 with a first, lower end 34 and a second, upper end 36. The body and the ends generally form cylindrical segments. Between the main body portion 32 and the end portion 34 a stepped reduction in diameter is included forming a shoulder 38. The shoulder 38 is generally perpendicular to the axis of the nozzle 28 and faces in a direction toward the fuel injection port 18 away from the center of the nozzle 280 At the other end of the nozzle 28, a shoulder is provided at the end of upper end portion 36~ A tubular member 40 is rigidly fixed within the end of the upper end portion 36 and extends outwardly past the end shoulder of the nozzle 28g The device for mounting the fuel injection nozzles 28 and the fuel supply manifold including the fittings 28 includes 163/2g5 a rigid mounting structure, generally designated 42. The mounting structure 42 includes a base 44, and upstanding body 46 and a mounting flange 48. The mcunting flange 4B may extend the length of the mounting structure 42 or may extend outwardly from the upstanding body at particular locations to accommodate the mounting of the injector nozzles 28 as typically illustrated in Figure 1. The mounting flange or 1anges 48 extend parallel to the base 44 and spaced therefrom. Connecting the base 44 and the mounting flange 48 is the upstanding body portion 46.
A generally U-shaped configuration is thus defined in which the nozzle 28 can be positioned as seen in Figures 2 and 4.
Additional strengthening elements 50 may be provided where beneficial or necessary.
The base 44 includes a hole 52 therethrough for each nozzle 28. The mounting flange 48 also includes a hole 54 therethrough, the holes 52 and 54 being coaxial and spaced apart. Both holes 52 and 54 are larger in diameter than the relevant portion of the nozzle 28. The spacing is designed such that the lower end 34 of the nozzle will extend through the hole 52 and the upper end of the nozzle 36 will extend into the hole 54. The hole 52 includes a first shoulder between two diameters of the hole. This first shoulder is in a plane perpendicular to the axis of the hole 52 and is facing away from the hole 54. The shoulder may be defined, for example, as illustrated in elther Figure 4 or Figure 6. In Figure 4, a washer 56 abutts against the step in diameters to form a wide shoulder. In Figure 6, such a washer is not present but a shoulder 58 is provided. The upper hole 54 is conveniently uniform throughout its lengthO
~ 7~ 163/29~
A first attachment means i5 employed to fix the mounting structure 42 to the engine. This means includes fasteners 60 which are threaded into the engine through the base 44, through holes 62 being provided for that purpose. A
second attachment means is providecl for fixing the fuel supply manifold and particularly the fixtures 26 to the mounting structure 42. This means includes attachment flanges 64 which are permanently fixed to the fixtures 26 and are held to the mounting flange 48 by fasteners 66. In both the case of the engine mounting and the fixture mounting~ the ho]es 52 and 54 are larger in diameter than the corresponding passageways 18 and 24. Thus, at the interface between the mounting structure 42 and each of the engines and the fixtures 26, a shoulder is defined facing toward the fuel injection nozzle 28.
To seal the engine at the fuel injection port 18, and to resiliently mount the fuel injection nozzle 28~ a first seal 68 is employed as shown in plan in Figure 5. This seal 68 is positioned between the shou~der provided by the engine and the shoulder provided by the washer 56 as configured in Figure 4.
The seal 68 is also positioned around a first diameter of the end 34 of the nozzle 28 such that it abutts against the lower mounting surface 380 The fit between the seal 68 and the fuel injection nozzle 28 is preferably one of interference for positive mounting and convenience of assembly. Additionally~
it is preerred that an interference fit exist between the seal 68 and the surrounding hole 52 in which the seal is located.
This again aids in assembly and positive mounting. Recesses 70 are provided about the periphery of the seal 68 and accommodate some deformation of material in the constrained environment ~ 7~ 163/295 of the seal 63. The seal 68 is also longer in axial length than the distance from the shoulder, in the case of Figure 4 defined by washer S6, and the end of the mounting structure 42.
Thus, when the mounting structure 42 is assembled with the engine, and the fasteners 60 are forced into position, the seal 68 will become compressed. The washer 56 aids in insuring a proper uniform deformation of the seal 68 under such compression.
Additionally, the seal 68 moves against the mounting surface 38 to fix in a resilient manner the location of the nozzle 28.
At the upper end of the fuel in]ection nozzle 28 a seal is provided to contain the pressurized fuel distributed from the fuel supply manifold. In the preferred embodiment, this seal is provided by an O-ring 72 fixed between the fixture 26 and the shoulder defined on the end 36 of the fuel injection nozzle 28~ The O-rin~ 72 cooperates with the tubular member 40 fixed in the end 36. Unlike the seal 68, the O-ring 72 is preferably sized so as to not be in interference fit with either the tubular member 40 or the surrounding hole 54 through the mounting structure 42. However~ the O-ring 72 is larger in axial dimension than the protruding pGrtion of the tubular member 40. Thus, when positioned, the O-ring 72 will be placed in compression against the surfaces to be sealed against escaping fuel~ The O-ring 72 also provides resilient mounting to isolate the vibration of the fuel injection nozzle 28 from the remainder of the system.
To position the fuel injection nozzle 28, the upper end 36 is positioned through the upper hole 54 ]ocated in the mounting flange 43. The lower end 34 of the nozzle 23 is then positioned through the lower hole 52. The washer 56 and the seal 68 are next positioned as is the O-ring 72. The fixture 26 is then fixed to the mounting flange 48 by means of the fasteners 66. Lastly, the entire assembly is positioned on the engine and fixed thereto by means of fasteners 60. This operationl and particularly the last step, results in the compression of the seals 68 and 72, As the seal 68 is compressed against the engine under the force of the fasteners 60, the seal 68 forces the nozzle 28 upwardly to compress the O-rings 72. The O-rin~ compression is controlled by means of the tubular member 40 abutting against the mounting surface of the fixture 26. This also fixes the compression of the nozzle 28 against the lower seal 68.
Because the diameters of the holes 52 and 54 are larger than the corresponding end portions 34 and 36 of the fuel injection nozzle 28, only resilient contact is established between the fuel injection nozzle 28 and the mounting structure 42. Vibration transmission is thus minimized and damped~ The clearances also result in far less rigorous machining require-ments. Anomolies in component dimensions are conveniently compensated for by the compression of one or both of the seals 68 and 72.
As referred to above, the mounting mechanism of the present invention not only provides vibration isolation but also provides thermal isolation as well. The seal members 68 and 72 are of common resilient material whlch by and large exhibit low thermal conductivity. Additionally, the nozzles and the fuel supply manifold are shielded from direct radiation rom the maniolds and the cylinder head. The upstanding body portion 46 of the mounting structure 42 along with the base 44 provide such shielding. The present arrangement also has advantage because the entire assembly may be prefabricated prior to final assembly with the engine.
Turning then to certain of the other embodiments, Figure 7 illustrates a modification deslgned primarily for reduction in thermal conductivity resulting in heating of the earlier embodiment are labelled with reference numerals corre~
sponding to the first embodiment where identical~ However, two changes are presented to improve thermal isolation. Firstl the mounting structure itself is shown to be formed of ceramic material. Ceramic materials generally provide exceptional thermal isolation and such an advantage would be provided here.
Secondly, a metallic collar 74 is fitted in a somewhat larger upper hole 54 through the mounting flange 48. The collar 74 acts to protect the ceramic material from injury at the inter~
- 15 face with the nozzle during insertion and the llke.
Figure 7 also illustrates the employment of a filter 76 which is shown to be integrally formed with the tubular member 40. The filter 76 has a hollow conical configuration and extends downwardly into the nozzle 280 The filtering material may be gauze or other suitable material which can be periodically changed as required.
Looking next to Figures 8-10, another modification of the device is illustrated. This modification is characterized by the joint between the engine and the mounting structure being of increased heat insulation. Again, a majority of the elements in this embodiment are substantially identical ;n construction with those of the preceding embodiments and identical reference numbers are employed. However, the lower portion of the mounting structure 42 has been deleted below the ~ 7~ 163/295 shoulder and instead, a ceramic or synthetic resin material is employed. This material forms a liner 78 beneath the base 44 which is resistant to heat flow therethrough. The sealing member 68 is positioned as in the first embodimentO The liner 78 is so constructed as to provide a larger hole than the hole 52 through the base 44. This creates a shoulder for mainte-nance of the seal 68. The same relative dimensions are incor-porated as with the first embodiment. Thus, the liner 7~ is slightly thinner than the axial dimension of the seal 68 to ~ place the seal 68 in compression upon assembly. The seal 68 is also in interference fit with both the fuel injection nozzle 28 and the liner 78.
Thus, a device for mounting a fuel injection system and particularly the fuel injection nozzles thereof is here disclosed. While embodiments and applications of this inven-tion have been shown and described, it would be apparent tothose skilled in the art that many more modifications are possible without departing from the inventive concepts herein.
The invention, therefore, is not to be restricted except in the ~ ~pi~ t th~ 3~perc-d ~
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SPECIFICATION
MOUNTING DEVICE FOR FUEL INJECTION NOZZLES
FO~ INTERNAL COMBUSTION ENGINES
1,~
BACKGROUND OF THE DISCLOSURE i The field of the present invention is fuel injection systems, and more particularly, devices for mounting injector nozzles for such fuel injection systems.
Fuel injection systems generally employ nozzles which are fixed relative to the engine at either the intake manifold ; lO or the cylinder head to direct fuel received from a fuel distribution line toward the intake of the engine cylinders at appropriately timed intervals. Such nozzles are usually comprised of a solenoid valve arranged to inject in an intermit- ¦
tent manner the fuel supplied thereto through the fuel distri-bution line. The nozzle is directed to provide fuel toward the combustion chamber in the engine cylinder, often indirectly via the intake manifold.
Mounting devices for mounting injector nozzles on engines have previously been employed which include a pipe joint such as a nipple for joining the injection nozzle to the fuel distribution line and a means for directly affixing the nozzle to an engine element such as the cylinder head or the intake manifold. Such mounting devices often require close machining tolerances and close mountiny tolerances in order to maintain an appropriate seal at the joints between the injec-tion nozzles and the fuel distribution line and also betweenthe injection noæzles and the engine.
'I'he requiremen-t :for close to:lerances and effective seals is often -the result o:f the difficul-t environmen-t in which injection nozzle is located. T}le nozzle i.tself vibra-tes during the injecting operation. This vib:ra-tion is transmitted to the joints with -the engine and ~ith the fue]. distribution line causing undesirable looseni.ng o~ -the joints. Fuel is thus able to leak between componen-ts. Fur-thermore, with standard mounting systems, the injec-tion nozzle as we:ll as the fuel distribu-tion line can easily become overhea-ted from -the engine. This is parti.cularly true in a counterflow type engine in which the intake manifolcl is arranged above the exhaust manifold where heat convection adds to the adverse thermal environment. As a result, the fuel may par-tially vaporize to create adverse operating conditions.
SUMMARY OF THE INVENTION
The present invention is directed to an improved device for mounting a fuel injection system to an engine.
According to one aspect of the inven-tion there is provided a device for mounting fuel injection nozzles and a fuel supply manifold for the nozzles to an enginet -the nozzles each being of a type having upper and lower mounting surfaces perpendicular to the axis of the nozzle, comprising a mounting structure having first and second coaxial, spaced holes for receipt of one fuel injection nozzle -therein;
first attachment means for fixing said mounting structure to the engine;
second attachment means for fixing the fuel supply manifold to said mounting structure;
first and second seals posi-tioned in said first and second holes respectively on the lower and upper mounting surfaces of the nozzle, said mountirlg structure being sized to 7.~
cornpress said seals hetween -the ~uel supply manifold and -the engine when assembled therewi-th.
Accorcling -to ano-ther aspec-t oE the inven-tion -there is provided a device for moun-ting Eue:l injection nozzles and a fuel supply mani.fold for the nozzles to an engine, the nozzles each being of a type having upper and lowe:r mount.ing surfaces perpendicular ~o the axis of -the nozzle, comprising a mounting structure inc:Lucling a base capable of being fixed -to -the engine, an ups-tanding body fixed -to saicl base, and a mounting flange fixed to said body and ex-tend.ing parallel to and spaced from said base, said base and said flange having firs-t and second aligned holes respectively for receipt of one fuel injection nozzle;
a-ttachment means for fixing the fuel suppor-t manifold at said second hole on said flange;
first and second seals positioned in said firs-t and second holes respectively on the lower and upper mounting surfaces of the nozzle, said mounting structure being sized to compress said seals between the fuel supply manifold and the engine when assembled -therewith.
According to a fur-ther aspect of the invention there is provided a device for mounting a fuel injection system to an engine, comprising in combination at least one fuel injection nozzle, each said fuel injec-tion nozz:Le including an elongate body having a first end for injecting fuel into an engine, a second end for receiving fuel, a first rnoun-ting surface adjacent said first end and a second mounting surface adjacent saicl second end, said mounting surfaces being perpendicular to the axis of said nozzle and 0 facing away from the center of said nozzle;
a mounting struc-ture including a base capable of being :Eixed -to the engine, an upstanding body fixed to said hase, anc. a moun-ting flange fixed -to saicl bocdy and extending parallel to and spaced from said base, saicl base and said flange having first and second aligned holes respectively for receipt of one said fuel injection nozzle, said first end being positioned in said first hole and said second end being posi-tioned in said second hole;
a fuel supply manifold posi-tioned on said mounting flange in communication with said second hole;
firs-t and second seals positioned in said firs-t and second holes respectively on the fi.rst and second mounting surfaces of one said nozzle, said moun-ting structure being sized to compress said seals between said fuel supply manifold and the engine when assembled therewith.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a top plan view illustrating a mounting device for fuel injection nozzles on an engine, according to one embodiment of the present invention.
Figure 2 is a fragmentary vertical sectional view taken along line 2-2 of F'igure 1.
Figure 3 is a front view illustrating a mounting struc-ture forming part of the device of Figure 1.
Figure 4 is a fragmentary side view, partially broken away, illustrating the mounting of a fuel injection nozzle.
Figure 5 is a cross-sec-tional view illustrating a firs-t sealing member forming part of the device of Figure 1.
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7~
163/2g5 Figure 6 is a cross-sectional elevation in detail of a seal ring in a deformed state but without the sealing ring or washer of the device of Figure 43 Figure 7 is a fragmentary side view~ partially broken away, illustrating a second embodiment of the device of Figure 1.
Figure 8 is a fragmentary side view, partially broken away, illustrating an additional modification of the device of Figure 1.
Figure 9 is a top plan view illustrating the device of Figure 8.
Figure 10 is a fragmentary vertical sectional view taken along line 10-10 of Figure 9.
DETAILED DESCRIPTION OF THE PREFERRED EMsoDIMENT
.
A device is disclosed for the mounting of fuel injection nozzles and a uel supply manifold for the injection nozzles on an engine. A first embodiment of this device is illustrated in Figures l~S. Specifically in Figures 1 and 2, the device of the present invention is illustrated in associa-tion with an engine. The engine is illustrated as employing a cylinder head 10, an intake manifold 12, an intake system 14 and a cylinder block 16 in a substantially conventional arrange-ment. A four-cylinder engine is illustrated with the intake passages in Figure 1 illustrated in broken lineO A fuel injectlon nozzle port 18 is illustrated as extending through the intake manifold 12 and partially throuyh the cylinder housing 10. Naturally, this port may be rearranged to accommo-date the characteristic of the particular injection system. An extended boss 20 provides a mounting surface on the engine for the injector system. Naturally, this provision for mounting of '7~ 163/2g5 the injector system rnay be provided on the intake manifold, the cylinder head or elsewhere on the engine where convenient.
A fuel supply maniold system is illustrated for supplying pressurized fuel to the injectors. This manifold includes a pipe 22 directing fuel t:o individual fuel passages 24 contained within fixtures 26. Four such passages 24 are provided in four fixtures 26 to serve each of the four cylinders in the present embodiment.
The fuel injection nozzles 28, as can best be seen in Figure 4 are of the type having a passageway 30 extending therethroughO This passageway is controlled by a solenoid valve contained within the nozzle 28 which may be electrically energized and de-energized by a conventional driving circuit.
Through the operation of the solenoid valve, fuel from the pressurized pipe 22 is appropriately injected on an intermit-tent basis into the engine~
The physical structure of each nozzle includes a main body portion 32 with a first, lower end 34 and a second, upper end 36. The body and the ends generally form cylindrical segments. Between the main body portion 32 and the end portion 34 a stepped reduction in diameter is included forming a shoulder 38. The shoulder 38 is generally perpendicular to the axis of the nozzle 28 and faces in a direction toward the fuel injection port 18 away from the center of the nozzle 280 At the other end of the nozzle 28, a shoulder is provided at the end of upper end portion 36~ A tubular member 40 is rigidly fixed within the end of the upper end portion 36 and extends outwardly past the end shoulder of the nozzle 28g The device for mounting the fuel injection nozzles 28 and the fuel supply manifold including the fittings 28 includes 163/2g5 a rigid mounting structure, generally designated 42. The mounting structure 42 includes a base 44, and upstanding body 46 and a mounting flange 48. The mcunting flange 4B may extend the length of the mounting structure 42 or may extend outwardly from the upstanding body at particular locations to accommodate the mounting of the injector nozzles 28 as typically illustrated in Figure 1. The mounting flange or 1anges 48 extend parallel to the base 44 and spaced therefrom. Connecting the base 44 and the mounting flange 48 is the upstanding body portion 46.
A generally U-shaped configuration is thus defined in which the nozzle 28 can be positioned as seen in Figures 2 and 4.
Additional strengthening elements 50 may be provided where beneficial or necessary.
The base 44 includes a hole 52 therethrough for each nozzle 28. The mounting flange 48 also includes a hole 54 therethrough, the holes 52 and 54 being coaxial and spaced apart. Both holes 52 and 54 are larger in diameter than the relevant portion of the nozzle 28. The spacing is designed such that the lower end 34 of the nozzle will extend through the hole 52 and the upper end of the nozzle 36 will extend into the hole 54. The hole 52 includes a first shoulder between two diameters of the hole. This first shoulder is in a plane perpendicular to the axis of the hole 52 and is facing away from the hole 54. The shoulder may be defined, for example, as illustrated in elther Figure 4 or Figure 6. In Figure 4, a washer 56 abutts against the step in diameters to form a wide shoulder. In Figure 6, such a washer is not present but a shoulder 58 is provided. The upper hole 54 is conveniently uniform throughout its lengthO
~ 7~ 163/29~
A first attachment means i5 employed to fix the mounting structure 42 to the engine. This means includes fasteners 60 which are threaded into the engine through the base 44, through holes 62 being provided for that purpose. A
second attachment means is providecl for fixing the fuel supply manifold and particularly the fixtures 26 to the mounting structure 42. This means includes attachment flanges 64 which are permanently fixed to the fixtures 26 and are held to the mounting flange 48 by fasteners 66. In both the case of the engine mounting and the fixture mounting~ the ho]es 52 and 54 are larger in diameter than the corresponding passageways 18 and 24. Thus, at the interface between the mounting structure 42 and each of the engines and the fixtures 26, a shoulder is defined facing toward the fuel injection nozzle 28.
To seal the engine at the fuel injection port 18, and to resiliently mount the fuel injection nozzle 28~ a first seal 68 is employed as shown in plan in Figure 5. This seal 68 is positioned between the shou~der provided by the engine and the shoulder provided by the washer 56 as configured in Figure 4.
The seal 68 is also positioned around a first diameter of the end 34 of the nozzle 28 such that it abutts against the lower mounting surface 380 The fit between the seal 68 and the fuel injection nozzle 28 is preferably one of interference for positive mounting and convenience of assembly. Additionally~
it is preerred that an interference fit exist between the seal 68 and the surrounding hole 52 in which the seal is located.
This again aids in assembly and positive mounting. Recesses 70 are provided about the periphery of the seal 68 and accommodate some deformation of material in the constrained environment ~ 7~ 163/295 of the seal 63. The seal 68 is also longer in axial length than the distance from the shoulder, in the case of Figure 4 defined by washer S6, and the end of the mounting structure 42.
Thus, when the mounting structure 42 is assembled with the engine, and the fasteners 60 are forced into position, the seal 68 will become compressed. The washer 56 aids in insuring a proper uniform deformation of the seal 68 under such compression.
Additionally, the seal 68 moves against the mounting surface 38 to fix in a resilient manner the location of the nozzle 28.
At the upper end of the fuel in]ection nozzle 28 a seal is provided to contain the pressurized fuel distributed from the fuel supply manifold. In the preferred embodiment, this seal is provided by an O-ring 72 fixed between the fixture 26 and the shoulder defined on the end 36 of the fuel injection nozzle 28~ The O-rin~ 72 cooperates with the tubular member 40 fixed in the end 36. Unlike the seal 68, the O-ring 72 is preferably sized so as to not be in interference fit with either the tubular member 40 or the surrounding hole 54 through the mounting structure 42. However~ the O-ring 72 is larger in axial dimension than the protruding pGrtion of the tubular member 40. Thus, when positioned, the O-ring 72 will be placed in compression against the surfaces to be sealed against escaping fuel~ The O-ring 72 also provides resilient mounting to isolate the vibration of the fuel injection nozzle 28 from the remainder of the system.
To position the fuel injection nozzle 28, the upper end 36 is positioned through the upper hole 54 ]ocated in the mounting flange 43. The lower end 34 of the nozzle 23 is then positioned through the lower hole 52. The washer 56 and the seal 68 are next positioned as is the O-ring 72. The fixture 26 is then fixed to the mounting flange 48 by means of the fasteners 66. Lastly, the entire assembly is positioned on the engine and fixed thereto by means of fasteners 60. This operationl and particularly the last step, results in the compression of the seals 68 and 72, As the seal 68 is compressed against the engine under the force of the fasteners 60, the seal 68 forces the nozzle 28 upwardly to compress the O-rings 72. The O-rin~ compression is controlled by means of the tubular member 40 abutting against the mounting surface of the fixture 26. This also fixes the compression of the nozzle 28 against the lower seal 68.
Because the diameters of the holes 52 and 54 are larger than the corresponding end portions 34 and 36 of the fuel injection nozzle 28, only resilient contact is established between the fuel injection nozzle 28 and the mounting structure 42. Vibration transmission is thus minimized and damped~ The clearances also result in far less rigorous machining require-ments. Anomolies in component dimensions are conveniently compensated for by the compression of one or both of the seals 68 and 72.
As referred to above, the mounting mechanism of the present invention not only provides vibration isolation but also provides thermal isolation as well. The seal members 68 and 72 are of common resilient material whlch by and large exhibit low thermal conductivity. Additionally, the nozzles and the fuel supply manifold are shielded from direct radiation rom the maniolds and the cylinder head. The upstanding body portion 46 of the mounting structure 42 along with the base 44 provide such shielding. The present arrangement also has advantage because the entire assembly may be prefabricated prior to final assembly with the engine.
Turning then to certain of the other embodiments, Figure 7 illustrates a modification deslgned primarily for reduction in thermal conductivity resulting in heating of the earlier embodiment are labelled with reference numerals corre~
sponding to the first embodiment where identical~ However, two changes are presented to improve thermal isolation. Firstl the mounting structure itself is shown to be formed of ceramic material. Ceramic materials generally provide exceptional thermal isolation and such an advantage would be provided here.
Secondly, a metallic collar 74 is fitted in a somewhat larger upper hole 54 through the mounting flange 48. The collar 74 acts to protect the ceramic material from injury at the inter~
- 15 face with the nozzle during insertion and the llke.
Figure 7 also illustrates the employment of a filter 76 which is shown to be integrally formed with the tubular member 40. The filter 76 has a hollow conical configuration and extends downwardly into the nozzle 280 The filtering material may be gauze or other suitable material which can be periodically changed as required.
Looking next to Figures 8-10, another modification of the device is illustrated. This modification is characterized by the joint between the engine and the mounting structure being of increased heat insulation. Again, a majority of the elements in this embodiment are substantially identical ;n construction with those of the preceding embodiments and identical reference numbers are employed. However, the lower portion of the mounting structure 42 has been deleted below the ~ 7~ 163/295 shoulder and instead, a ceramic or synthetic resin material is employed. This material forms a liner 78 beneath the base 44 which is resistant to heat flow therethrough. The sealing member 68 is positioned as in the first embodimentO The liner 78 is so constructed as to provide a larger hole than the hole 52 through the base 44. This creates a shoulder for mainte-nance of the seal 68. The same relative dimensions are incor-porated as with the first embodiment. Thus, the liner 7~ is slightly thinner than the axial dimension of the seal 68 to ~ place the seal 68 in compression upon assembly. The seal 68 is also in interference fit with both the fuel injection nozzle 28 and the liner 78.
Thus, a device for mounting a fuel injection system and particularly the fuel injection nozzles thereof is here disclosed. While embodiments and applications of this inven-tion have been shown and described, it would be apparent tothose skilled in the art that many more modifications are possible without departing from the inventive concepts herein.
The invention, therefore, is not to be restricted except in the ~ ~pi~ t th~ 3~perc-d ~
Claims (21)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for mounting fuel injection nozzles and a fuel supply manifold for the nozzles to an engine, the nozzles each being of a type having upper and lower mounting surfaces perpendicular to the axis of the nozzle, comprising a mounting structure having first and second coaxial, spaced holes for receipt of one fuel injection nozzle therein;
first attachment means for fixing said mounting structure to the engine;
second attachment means for fixing the fuel supply manifold to said mounting structure;
first and second seals positioned in said first and second holes respectively on the lower and upper mounting surfaces of the nozzle, said mounting structure being sized to compress said seals between the fuel supply manifold and the engine when assembled therewith.
first attachment means for fixing said mounting structure to the engine;
second attachment means for fixing the fuel supply manifold to said mounting structure;
first and second seals positioned in said first and second holes respectively on the lower and upper mounting surfaces of the nozzle, said mounting structure being sized to compress said seals between the fuel supply manifold and the engine when assembled therewith.
2. The device of claim 1 wherein said first hole includes a first shoulder in a plane perpendicular to the axis of said first hole facing away from said second hole, said first seal being resilient and extending from said first shoulder to beyond the end of said hole for compression of said first seal when said mounting structure is assembled with the engine.
3. The device of claim 2 wherein said first shoulder includes a step in the surface of said first hole and a washer positioned at and retained by said step, said first seal abutting against said washer.
4. The device of claim 2 wherein said first shoulder is located relative to said second hole such that said second seal is placed in compression by forced movement of said first seal against said first shoulder upon assembly.
5. The device of claim 1 wherein there are a plurality of said first holes and a plurality of said second holes to accommodate multiple fuel injection nozzles.
6. The device of claim 1 wherein said first seal is in interference fit with said first hole.
7. The device of claim 6 wherein said first seal is sized to be in interference fit with the fuel injection nozzle.
8. The device of claim 7 wherein said first seal includes recesses formed in the periphery of said seal.
9. The device of claim 1 further comprising a tubular member fixed to the end of the fuel injection nozzle positioned in said second hole, said tubular member extending from the end of the injection nozzle a distance less than the thickness of said second seal.
10. The device of claim 1 wherein said first attach-ment means includes fasteners fixing said mounting structure to the engine and said second attachment means includes attachment flanges fixed to the fuel supply manifold and fasteners for fastening said attachment flanges to said mounting structure.
11. A device for mounting fuel injection nozzles and a fuel supply manifold for the nozzles to an engine, the nozzles each being of a type having upper and lower mounting surfaces perpendicular to the axis of the nozzle, comprising a mounting structure including a base capable of being fixed to the engine, an upstanding body fixed to said base, and a mounting flange fixed to said body and extending parallel to and spaced from said base, said base and said flange having first and second aligned holes respectively for receipt of one fuel injection nozzle;
attachment means for fixing the fuel support manifold at said second hole on said flange;
first and second seals positioned in said first and second holes respectively on the lower and upper mounting surfaces of the nozzle, said mounting structure being sized to compress said seals between the fuel supply manifold and the engine when assembled therewith.
attachment means for fixing the fuel support manifold at said second hole on said flange;
first and second seals positioned in said first and second holes respectively on the lower and upper mounting surfaces of the nozzle, said mounting structure being sized to compress said seals between the fuel supply manifold and the engine when assembled therewith.
12. The device of claim 11 wherein said first hole includes a first shoulder in a plane perpendicular to the axis of said first hole facing away from said second hole, said first seal being resilient and extending from said first shoulder to beyond the end of said hole for compression of said first seal when said mounting structure is assembled with the engine.
13. The device of claim 12 wherein said first shoulder is located relative to said second hole such that said second seal is placed in compression by forced movement of said first seal against said first shoulder upon assembly.
14. The device of claim 11 wherein there are a plurality of said first holes and a plurality of said second holes to accommodate multiple fuel injection nozzles.
15. The device of claim 13 further including a tubular member fixed to the end of the fuel injection nozzle positioned in said second hole, said tubular member extending from the end of the injection nozzle a distance less than the thickness of said second seat.
16. The device of claim 11 wherein said upstanding body is substantially solid along the length of the device to define a heat shield.
17. The device of claim 11 wherein said mounting structure is of low thermal conductivity and said second hole includes a circular insert into which the fuel injection nozzle fits.
18. The device of claim 11 further comprising a filter positioned in said second hole between the fuel supply manifold and the fuel injection nozzle.
19. A device for mounting a fuel injection system to an engine, comprising in combination at least one fuel injection nozzle, each said fuel injection nozzle including an elongate body having a first end for injecting fuel into an engine, a second end for receiv-ing fuel, a first mounting surface adjacent said first end and a second mounting surface adjacent said second end, said mounting surfaces being perpendicular to the axis of said nozzle and facing away from the center of said nozzle;
a mounting structure including a base capable of being fixed to the engine, an upstanding body fixed to said base, and a mounting flange fixed to said body and extending parallel to and spaced from said base, said base and said flange having first and second aligned holes respectively for receipt of one said fuel injection nozzle, said first end being positioned in said first hole and said second end being posi-tioned in said second hole;
a fuel supply manifold positioned on said mounting flange in communication with said second hole;
first and second seals positioned in said first and second holes respectively on the first and second mounting surfaces of one said nozzle, said mounting structure being sized to compress said seals between said fuel supply manifold and the engine when assembled therewith.
a mounting structure including a base capable of being fixed to the engine, an upstanding body fixed to said base, and a mounting flange fixed to said body and extending parallel to and spaced from said base, said base and said flange having first and second aligned holes respectively for receipt of one said fuel injection nozzle, said first end being positioned in said first hole and said second end being posi-tioned in said second hole;
a fuel supply manifold positioned on said mounting flange in communication with said second hole;
first and second seals positioned in said first and second holes respectively on the first and second mounting surfaces of one said nozzle, said mounting structure being sized to compress said seals between said fuel supply manifold and the engine when assembled therewith.
20. The device of claim 19 wherein said first end of said fuel injection nozzle and said first hole in which said first end is positioned define a gap therebetween and said second end of said fuel injection nozzle positioned in said second hole in said mounting flange also define a gap there-between.
21. The device of claim 19 wherein said first hole includes a first shoulder in a plane perpendicular to the axis of said first hole facing away from said second hole, said first seal being resilient and extending from said first shoulder to beyond the end of said hole for compression of said first seal when said mounting structure is assembled with the engine and the device further comprises a tubular member fixed to said second end of said fuel injection nozzle positioned in said second hole, said tubular member extending from the end of said injection nozzle a distance less than the thickness of said second seal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPU56-163803 | 1981-11-04 | ||
| JP16380381U JPS5870455U (en) | 1981-11-04 | 1981-11-04 | Fuel nozzle mounting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1188171A true CA1188171A (en) | 1985-06-04 |
Family
ID=15780996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000414742A Expired CA1188171A (en) | 1981-11-04 | 1982-11-03 | Mounting device for fuel injection nozzles for internal combustion engines |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5870455U (en) |
| CA (1) | CA1188171A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61261662A (en) * | 1985-05-14 | 1986-11-19 | Honda Motor Co Ltd | Injector fitting device of fuel injection-type engine |
| DE502006006106D1 (en) * | 2005-03-03 | 2010-03-25 | Bosch Gmbh Robert | FUEL INJECTION EQUIPMENT |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS543226U (en) * | 1977-06-08 | 1979-01-10 | ||
| DE2908095C2 (en) * | 1979-03-02 | 1984-02-16 | Robert Bosch Gmbh, 7000 Stuttgart | Fuel injection system for internal combustion engines |
-
1981
- 1981-11-04 JP JP16380381U patent/JPS5870455U/en active Granted
-
1982
- 1982-11-03 CA CA000414742A patent/CA1188171A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5870455U (en) | 1983-05-13 |
| JPS6329874Y2 (en) | 1988-08-10 |
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| MKEC | Expiry (correction) | ||
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