EP0711915A1 - Connecting structure for injection nozzle pipe - Google Patents
Connecting structure for injection nozzle pipe Download PDFInfo
- Publication number
- EP0711915A1 EP0711915A1 EP95117470A EP95117470A EP0711915A1 EP 0711915 A1 EP0711915 A1 EP 0711915A1 EP 95117470 A EP95117470 A EP 95117470A EP 95117470 A EP95117470 A EP 95117470A EP 0711915 A1 EP0711915 A1 EP 0711915A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pipe
- injection nozzle
- nozzle
- fuel
- set forth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Definitions
- the present invention relates generally to an injection nozzle employed in a diesel engine or the like. More particularly, it pertains to a structure for connecting a pipe, which extends from a pump to an injection nozzle to convey pressurized fluid such as fuel therebetween, to the injection nozzle.
- Injection nozzles that inject fuel in, for instance, diesel engines, have conventionally been fixed to the engine cylinder head.
- a fuel pipe extending from a fuel injection pump is connected to the nozzle to convey pressurized fuel to the nozzle. Since the fuel in the pipe is under high pressure, sealing the connection between the nozzle and the pipe is important.
- Japanese Unexamined Utility Model Publication 6-18044 discloses a structure that is used to connect a nozzle and a fuel pipe.
- an injection nozzle 21 is secured in a hole 23 defined in a cylinder head 22, as shown in Fig. 4.
- a fuel pipe 25 extending from a fuel injection pump 24 is separably connected to the nozzle 21 by a coupler 26.
- the fuel pipe 25 is separably secured to a manifold 27, which is fastened to a cylinder head 22, by a clip 28 and a bolt 29.
- the fuel pipe 25 is connected to the nozzle 21 by the coupler 26 in the proximity of the nozzle 21.
- the coupler 26 is provided proximal to the nozzle 21, high fuel pressure acts on the joint of the coupler 26. As a result, there is a possibility that fuel may leak from that joint.
- a connecting structure between a pipe member and an injection nozzle which is secured to a body is provided. Fluid is supplied to the injection nozzle from a pump through the pipe member.
- the pipe member includes a first pipe and a second pipe respectively connected to the pump and the injection nozzle. At least one of opposed ends of the first pipe and the second pipe is secured to the body. The first pipe and the second pipe are detachably coupled to each other at a portion secured to the body.
- a cylinder head 1 includes a hole 2 which receives an injection nozzle 5, a hole 3 which receives an intake and exhaust valve (not shown), and a bearing portion 4, which a cam shaft (not shown) is mounted to.
- the injection nozzle 5, which injects fuel is made of a metal cylinder with its diameter varying at different positions along its axial direction.
- a guide pipe 6 extending from the nozzle 5 is made of material having a predetermined flexibility, and is integrally prefixed to the nozzle 5 at one end.
- the pipe 6 and the nozzle 5 are inseparably fastened to each other.
- a securing block 7 is connected to the other end of the pipe 6 as shown in Fig. 2.
- a first joint member 8 is integrally fixed to the block 7.
- the pipe 6 is fixed to the inside of the block 7.
- the pipe 6 is inseparably fastened to the joint member 8.
- the members 5 through 8 constitute an integral assembly.
- the nozzle 5 may be of a type that is opened according to alterations in fluid pressure or of a type that is opened by electrically controlled electromagnetic valves.
- the former type is generally used in diesel engines.
- the nozzle 5 is first fit into the hole 2 and then fastened to the cylinder head 1.
- a hole 9, defined in the block 7, is used to fasten the block 7 to the cylinder head 1.
- a rib 10 formed on the cylinder head 1 has a bolt hole 11. As shown in Fig. 2, by inserting a bolt 12 into the hole 9 with the block 7 positioned above the rib 10 and then tightly screwing the bolt 12, the block 7 becomes fastened to the cylinder head 1. In this fixed state, the guide pipe 6 extends above and curves around the cam shaft (not shown).
- a second joint member 15 is attached to the distal end of the fuel pipe 14 extending from the fuel injection pump 13.
- the joint member 15 cooperates with the first joint member 8 provided on the block 7.
- the fuel pipe 14 is connected to the guide pipe 6 by coupling the two joint members 8, 15 together and then tightening a nut 16 around the outer side of the connection.
- the end of the guide pipe 6 extending from the nozzle 5 is secured to the cylinder head 1 by the block 7.
- the guide pipe 6 and the fuel pipe 14 are separably linked to each other by the coupling of the joint members 8, 15 at the location of the block 7.
- the fuel pipe 14 is separably connected to the first joint member 8 at the outer side of the cylinder head 1.
- a cover 17 surrounding the nozzle 5 is attached to the cylinder head 1.
- the two coupled joint members 8, 15 are fixed to the cylinder head 1. This reduces vibration of the two joint members 8, 15 and suppresses a decline in the sealing performance of the connection due to vibration. This also reduces the possibility of fuel leakage.
- a flexible guide pipe 6 is employed. Therefore, the guide pipe 6 does not transmit forces to the connection between the guide pipe 6 and the nozzle 5. Accordingly, more reliable sealing between the pipe 6 and the nozzle 5 is ensured.
- the fuel pipe 14 may be connected with or disconnected from the guide pipe 6 at the outside of the cylinder head 1 without taking off the cover 17 for conducting maintenance. Hence, workability during maintenance of the diesel engine is improved.
- only the guide pipe 6 is secured to the cylinder head 1 by the block 7.
- the guide pipe 6 and the fuel pipe 14 may both be secured to the cylinder head 1 by the block 7.
- only the fuel pipe 14 may be secured to the cylinder head 1 by the block 7.
- the guide pipe 6 and the nozzle 5 are made of different materials in the illustrated embodiment, they may be made of the same material. In this case, the nozzle and the guide pipe may be integrally diecast.
- the connecting structure is embodied in a fuel injection system.
- the connecting structure may be used when connecting an oil pipe, which extends from a hydraulic pump, to an injection nozzle or when connecting other fluid pipes used with other types of fluids that extend from a fluid pump to an injection nozzle.
- a connecting structure for pipes (6, 14) used to convey fluids to an injection nozzle (5) of a diesel engine or the like is disclosed.
- a block (7) is provided at an end portion of the guide pipe (6), which extends from the injection nozzle (5).
- the block (7) is secured to a cylinder head (1) by a bolt (12).
- the guide pipe (6) and the fuel pipe (14) are separably connected to each other by two joint members (8, 15) at the location of the block (7).
- the connecting portion of the two pipes (6, 14) is separated from the nozzle (5) by a distance equal to the length of the guide pipe (6).
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A connecting structure for pipes (6, 14) used to convey fluids to an injection nozzle (5) of a diesel engine or the like is disclosed. A block (7) is provided at an end portion of the guide pipe (6), which extends from the injection nozzle (5). The block (7) is secured to a cylinder head (1) by a bolt (12). The guide pipe (6) and the fuel pipe (14) are separably connected to each other by two joint members (8, 15) at the location of the block (7). In this structure, the connecting portion of the two pipes (6, 14) is separated from the nozzle (5) by a distance equal to the length of the guide pipe (6).
Description
- The present invention relates generally to an injection nozzle employed in a diesel engine or the like. More particularly, it pertains to a structure for connecting a pipe, which extends from a pump to an injection nozzle to convey pressurized fluid such as fuel therebetween, to the injection nozzle.
- Injection nozzles that inject fuel in, for instance, diesel engines, have conventionally been fixed to the engine cylinder head. Typically, a fuel pipe extending from a fuel injection pump is connected to the nozzle to convey pressurized fuel to the nozzle. Since the fuel in the pipe is under high pressure, sealing the connection between the nozzle and the pipe is important.
- Japanese Unexamined Utility Model Publication 6-18044 discloses a structure that is used to connect a nozzle and a fuel pipe. In the connecting structure of this publication, an
injection nozzle 21 is secured in ahole 23 defined in acylinder head 22, as shown in Fig. 4. Afuel pipe 25 extending from afuel injection pump 24 is separably connected to thenozzle 21 by acoupler 26. Thefuel pipe 25 is separably secured to amanifold 27, which is fastened to acylinder head 22, by aclip 28 and abolt 29. - However, in the above connecting structure, the
fuel pipe 25 is connected to thenozzle 21 by thecoupler 26 in the proximity of thenozzle 21. In this type of fuel injecting system, the further the distance from the pump is, the higher the fluid pressure becomes. That is, the pressure is highest in the proximity of the injection nozzle. Consequently, since thecoupler 26 is provided proximal to thenozzle 21, high fuel pressure acts on the joint of thecoupler 26. As a result, there is a possibility that fuel may leak from that joint. - Accordingly, it is a primary objective of the present invention to provide a structure which connects a pipe extending from a pump to convey pressurized fluid, such as fuel, to an injection nozzle fixed to a machine body, such as an engine cylinder head or the like, in which the connecting structure reduces the possibility of fuel leakage.
- To achieve the foregoing and other objects and in accordance with the purpose of the present invention, a connecting structure between a pipe member and an injection nozzle which is secured to a body is provided. Fluid is supplied to the injection nozzle from a pump through the pipe member. The structure characterized by that the pipe member includes a first pipe and a second pipe respectively connected to the pump and the injection nozzle. At least one of opposed ends of the first pipe and the second pipe is secured to the body. The first pipe and the second pipe are detachably coupled to each other at a portion secured to the body.
- The features of the present invention that are believed to be novel are set forth with particularity in the appended claims. The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:
- Fig. 1 is a partial perspective view of a cylinder, a nozzle, etc., according to the present invention;
- Fig. 2 is a diagrammatic side view showing a connecting structure of a guide pipe, which leads to the nozzle, and a fuel pipe, which leads to a fuel injection pipe;
- Fig. 3 is a graph and diagram indicating the relation between distance from the fuel injection pump and fuel pressure; and
- Fig. 4 is a partial cross-sectional view showing a prior art connecting structure.
- An embodiment of a connecting structure for an injection nozzle pipe in a diesel engine according to the present invention will hereinafter be described with reference to the drawings.
- As shown in Fig. 1, a
cylinder head 1 includes a hole 2 which receives aninjection nozzle 5, ahole 3 which receives an intake and exhaust valve (not shown), and abearing portion 4, which a cam shaft (not shown) is mounted to. Theinjection nozzle 5, which injects fuel, is made of a metal cylinder with its diameter varying at different positions along its axial direction. Aguide pipe 6 extending from thenozzle 5 is made of material having a predetermined flexibility, and is integrally prefixed to thenozzle 5 at one end. Thepipe 6 and thenozzle 5 are inseparably fastened to each other. Asecuring block 7 is connected to the other end of thepipe 6 as shown in Fig. 2. A first joint member 8 is integrally fixed to theblock 7. Thepipe 6 is fixed to the inside of theblock 7. Thepipe 6 is inseparably fastened to the joint member 8. Themembers 5 through 8 constitute an integral assembly. - The
nozzle 5 may be of a type that is opened according to alterations in fluid pressure or of a type that is opened by electrically controlled electromagnetic valves. The former type is generally used in diesel engines. - The
nozzle 5 is first fit into the hole 2 and then fastened to thecylinder head 1. A hole 9, defined in theblock 7, is used to fasten theblock 7 to thecylinder head 1. Arib 10 formed on thecylinder head 1 has a bolt hole 11. As shown in Fig. 2, by inserting abolt 12 into the hole 9 with theblock 7 positioned above therib 10 and then tightly screwing thebolt 12, theblock 7 becomes fastened to thecylinder head 1. In this fixed state, theguide pipe 6 extends above and curves around the cam shaft (not shown). - As shown in Fig. 2, a second
joint member 15 is attached to the distal end of thefuel pipe 14 extending from thefuel injection pump 13. Thejoint member 15 cooperates with the first joint member 8 provided on theblock 7. As shown in Fig. 2, thefuel pipe 14 is connected to theguide pipe 6 by coupling the twojoint members 8, 15 together and then tightening anut 16 around the outer side of the connection. Thus, the end of theguide pipe 6 extending from thenozzle 5 is secured to thecylinder head 1 by theblock 7. Theguide pipe 6 and thefuel pipe 14 are separably linked to each other by the coupling of thejoint members 8, 15 at the location of theblock 7. Furthermore, thefuel pipe 14 is separably connected to the first joint member 8 at the outer side of thecylinder head 1. Acover 17 surrounding thenozzle 5 is attached to thecylinder head 1. - As shown in Fig. 3, fuel pressure in the
fuel pipe 14 increases as the distance from thefuel injection pump 13 increases. As a result, the fuel pressure reaches its highest value in the proximity of thenozzle 5. However, with the connecting structure of the present invention, the connection between theguide pipe 6 and thefuel pipe 14, or the coupling location of the twojoint members 8, 15, is upstream from thenozzle 5 by a distance equal to the length of theguide pipe 6. As shown in Fig. 3, the difference in fuel pressure between the coupling location of the present invention and the conventional coupling portion is apparent. In other words, fuel pressure at the coupling location of the twojoint members 8, 15 is lower than that in close proximity to thenozzle 5. Accordingly, the relatively low fuel pressure at the coupling location of the twojoint members 8, 15 reduces the possibility of fuel leakage. - In this embodiment, the two coupled
joint members 8, 15 are fixed to thecylinder head 1. This reduces vibration of the twojoint members 8, 15 and suppresses a decline in the sealing performance of the connection due to vibration. This also reduces the possibility of fuel leakage. - Furthermore, in this embodiment, a
flexible guide pipe 6 is employed. Therefore, theguide pipe 6 does not transmit forces to the connection between theguide pipe 6 and thenozzle 5. Accordingly, more reliable sealing between thepipe 6 and thenozzle 5 is ensured. - In addition, the
fuel pipe 14 may be connected with or disconnected from theguide pipe 6 at the outside of thecylinder head 1 without taking off thecover 17 for conducting maintenance. Hence, workability during maintenance of the diesel engine is improved. - Although only one embodiment of the present invention has been described herein, it should be apparent to those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit or scope of the invention. Particularly, it should be understood that the present invention may be embodied in the forms described below.
- In the illustrated embodiment, only the
guide pipe 6 is secured to thecylinder head 1 by theblock 7. However, theguide pipe 6 and thefuel pipe 14 may both be secured to thecylinder head 1 by theblock 7. Alternatively, only thefuel pipe 14 may be secured to thecylinder head 1 by theblock 7. - Although the
guide pipe 6 and thenozzle 5 are made of different materials in the illustrated embodiment, they may be made of the same material. In this case, the nozzle and the guide pipe may be integrally diecast. - Furthermore, in the illustrated embodiment, the connecting structure is embodied in a fuel injection system. Alternatively, the connecting structure may be used when connecting an oil pipe, which extends from a hydraulic pump, to an injection nozzle or when connecting other fluid pipes used with other types of fluids that extend from a fluid pump to an injection nozzle.
- Therefore, the present examples and embodiments are to be considered as illustrative and not restrictive and the invention is not to be limited to the details given herein, but may be modified within the scope of the appended claims.
- A connecting structure for pipes (6, 14) used to convey fluids to an injection nozzle (5) of a diesel engine or the like is disclosed. A block (7) is provided at an end portion of the guide pipe (6), which extends from the injection nozzle (5). The block (7) is secured to a cylinder head (1) by a bolt (12). The guide pipe (6) and the fuel pipe (14) are separably connected to each other by two joint members (8, 15) at the location of the block (7). In this structure, the connecting portion of the two pipes (6, 14) is separated from the nozzle (5) by a distance equal to the length of the guide pipe (6).
Claims (10)
- A connecting structure between a pipe member (14) and an injection nozzle (5) which is secured to a body (1), wherein fluid is supplied to the injection nozzle (5) from a pump (13) through said pipe member (14), said structure characterized by that:
said pipe member includes a first pipe (14) and a second pipe (6) respectively connected to the pump (13) and the injection nozzle (5), wherein at least one of opposed ends of the first pipe (14) and the second pipe (6) is secured to the body (1), and wherein said first pipe (14) and the second pipe (6) are detachably coupled to each other at a portion secured to the body (1). - The structure as set forth in Claim 1, characterized by that at least one of said opposed ends of the first pipe (14) and the second pipe (6) is secured to the body (1) by a bolt (12) screwed into a bolt hole (11) by way of a block (7).
- The structure as set forth in Claims 1 or 2, characterized by that said first pipe (14) and said second pipe (6) are detachably coupled to each other via a first joint (8) and a second joint (15).
- The structure as set forth in Claim 3, characterized by that said first and second joints (8,15) are disposed outside of the body (1).
- The structure as set forth in Claims 3 or 4, characterized by that said first pipe (14) and said second pipe (6) are fastened by a nut (16) at coupling portions of the pipes (14,6).
- The structure as set forth in Claim 3, characterized by that the distal end of the second pipe (6) is secured to the body (1) by a bolt (12) screwed into a bolt hole (11) by way of a block (7), wherein said first pipe (14) and said second pipe (6) are coupled to each other by the first joint (8) and the second joint (15) respectively mounted to the block (7) and the distal end of the first pipe (14).
- The structure as set forth in Claim 6, characterized by that said injection nozzle (5), said second pipe (6), said block (7) and said first joint (8) are attached to one another to form an assembly.
- The structure as set forth in any one of the preceding claims, characterized by that said second pipe (6) is made of a material having a predetermined flexibility.
- The structure as set forth in any one of the preceding claims, characterized by that said injection nozzle (5) is arranged to open in accordance with pressure of the fluid.
- A diesel engine using the connection structure as set forth in any one of the preceding claims, characterized by the cylinder head (1), the fuel injection nozzle (5) and the fuel injection pump (13), wherein fuel is supplied from the fuel injection pump (13) to the fuel injection nozzle (5) to be injected to the engine from the nozzle (5).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27402494A JPH08135539A (en) | 1994-11-08 | 1994-11-08 | Connecting structure of pipe for injection nozzle |
JP274024/94 | 1994-11-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0711915A1 true EP0711915A1 (en) | 1996-05-15 |
Family
ID=17535902
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95117470A Withdrawn EP0711915A1 (en) | 1994-11-08 | 1995-11-07 | Connecting structure for injection nozzle pipe |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0711915A1 (en) |
JP (1) | JPH08135539A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2317646A (en) * | 1996-09-27 | 1998-04-01 | Nissan Motor | Fuel supply piping structure for a direct-injection diesel engine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100411805B1 (en) * | 2001-01-30 | 2003-12-24 | 엘지칼텍스가스 주식회사 | Preventive device of loss and leakage in fuel |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62101879A (en) * | 1985-10-29 | 1987-05-12 | Sanshin Ind Co Ltd | Fuel feed piping connection structure in fuel injection engine |
EP0472515A1 (en) * | 1990-08-22 | 1992-02-26 | AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List | Internal combustion engine with pipeline passage from the oil space |
JPH0618044U (en) | 1992-08-07 | 1994-03-08 | 小松ゼノア株式会社 | Fuel tank for construction machinery |
-
1994
- 1994-11-08 JP JP27402494A patent/JPH08135539A/en active Pending
-
1995
- 1995-11-07 EP EP95117470A patent/EP0711915A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62101879A (en) * | 1985-10-29 | 1987-05-12 | Sanshin Ind Co Ltd | Fuel feed piping connection structure in fuel injection engine |
EP0472515A1 (en) * | 1990-08-22 | 1992-02-26 | AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List | Internal combustion engine with pipeline passage from the oil space |
JPH0618044U (en) | 1992-08-07 | 1994-03-08 | 小松ゼノア株式会社 | Fuel tank for construction machinery |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 11, no. 318 (M - 632) 16 October 1987 (1987-10-16) * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2317646A (en) * | 1996-09-27 | 1998-04-01 | Nissan Motor | Fuel supply piping structure for a direct-injection diesel engine |
GB2317646B (en) * | 1996-09-27 | 1998-11-11 | Nissan Motor | Fuel supply piping structure of direct-injection type diesel engine |
US5950602A (en) * | 1996-09-27 | 1999-09-14 | Nissan Motor Cq., Ltd. | Fuel supply piping structure of direct-injection type diesel engine |
Also Published As
Publication number | Publication date |
---|---|
JPH08135539A (en) | 1996-05-28 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 19951107 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB |
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Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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18W | Application withdrawn |
Withdrawal date: 19960531 |