GB2302136A - Arrangement for fastening a fuel injection nozzle holder in an i.c. engine - Google Patents
Arrangement for fastening a fuel injection nozzle holder in an i.c. engine Download PDFInfo
- Publication number
- GB2302136A GB2302136A GB9611131A GB9611131A GB2302136A GB 2302136 A GB2302136 A GB 2302136A GB 9611131 A GB9611131 A GB 9611131A GB 9611131 A GB9611131 A GB 9611131A GB 2302136 A GB2302136 A GB 2302136A
- Authority
- GB
- United Kingdom
- Prior art keywords
- length
- injection
- nozzle holder
- cylinder head
- fastening
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
1 Device for fastening an injection-nozzle holder 2302136 The invention
relates to a device for fastening an injection-nozzle holder in a receiving hole in the cylinder head of an internal combustion engine.
Devices of this kind for fastening injection-nozzle holders on the cylinder head of internal combustion engines are sufficiently well known. Thus, for example, Fig. 3 of Austrian Patent 350,854 shows and describes a device in which the injection-nozzle holder is pressed onto its seat in a receiving hole in the cylinder head by a strap. The strap, which is of two-armed design, is supported by its lever arm pointing away from the injection-nozzle holder on the supporting location of an offset contact surface on the cylinder-head cover side of the cylinder head.
Devices of this kind are also known from German Periodical: ATZ Automobiltechnische Zeitschrift 76(1974)1, pages 1-5, especially Figure 1.
The present invention seeks to dimension the fastening of an injectionnozzle holder in such a way that differences in thermal expansion which occur when using different materials for the cylinder head and the injection-nozzle holder, caused by fluctuating operating temperatures, do not lead to any significant losses in the preloading force on the injection-nozzle holder.
According to the present invention there is provided a device for fastening an injection-nozzle holder in a receiving hole in a cylinder head of an internal combustion engine, with a fastening screw which is screwed into a threaded hole in the cylinder head and with a strap through which the said screw passes, which strap comprises a twoarmed lever with an effective length (b) and one lever arm of which, with an effective length (a), is supported on the cylinder head, on a supporting location, in a plane (A) lying perpendicular to the longitudinal axis (c) of the injection-nozzle holder, and the other lever arm of which, with the length (b-a) is supported on a force-introducing 2 supporting surface on the injection-nozzle holder, which is pressed onto a seat in the receiving hole under a def ined preloading force, a free section, with the length (LSchr), of the fastening screw lying between the plane (A) and the entry to the threaded hole, and a section with the length (LDH) being f ormed between the plane (A) and the seat end of the injection-nozzle holder, wherein the ratio of the length (a) to the length (b) is at least approximately equal to the ratio of the length (LSchr) to the length (LDH) In a preferred embodiment, that lever arm of the strap which points away from the injection-nozzle holder is supported on the cylinder head via a ball, for which matching spherical bearing locations are provided in the lever arm and on the cylinder head.
In another embodiment, a spherical washer, which rests in a correspondingly shaped recess in the strap, is placed between the strap and the head of the fastening screw.
By means of the measures according to the invention, temperature-neutral clamping of the injection-nozzle holder on the cylinder head is achieved even though the injectionnozzle holder and the cylinder head are made of different materials with different coefficients of expansion. Thus the differences in thermal expansion which occur due to fluctuating operating temperatures lead to virtually no significant losses in the preloading force on the injectionnozzle holder and consequently to virtually no impairment of the sealing effect in the seat region of the injectionnozzle holder. The preloading force is at least substantially the same in the hot state as in the cold state.
A fastening means of a similar type for the injectionnozzle holder is furthermore described in DE 44 13 415 Cl; however, this fastening means has a fastening screw without a free section and, in addition, an additional component is used, namely a clamp which reaches around the strap on one side.
An embodiment of the invention is illustrated in the 3 drawing and described in greater detail below with reference to the exemplary embodiment.
To f ix an injection-nozzle holder I in position in a receiving hole 2 in the cylinder head 3 of an internal combustion engine, a device 4 comprising a two-armed strap 5 and an elongated fastening screw 6 is provided.
That part of the injection-nozzle holder 1 which projects from the receiving hole 2 has two diametrically opposite supporting surfaces 8 which are formed by flats 7 and on which the fork-shaped nozzle-holderside lever arm 9 of the strap 5 rests by means of its spherically profiled prongs 10 and presses the injection-nozzle holder I onto a seat 11 formed by a pressure shoulder in the receiving hole 2.
Between the injection-nozzle-side end of the injectionnozzle holder 1 and the seat 11 there is a sealing washer 12.
The fastening screw 6 passes through the strap 5, first of all runs f reely through a receiving hole 13 in the cylinder head 3 and is screwed into a threaded hole 14 in the cylinder head 3, said threaded hole being situated at the end remote from the strap 5.
The receiving hole 13 accommodating the screw and the receiving hole 2 accommodating the nozzle holder are arranged parallel to one another.
That lever arm 15 of the strap 5 which points away f rom the injectionnozzle holder 1 is supported via a ball 16 on a supporting location 22 on the cylinder head 3. The supporting location 22 lies at the level of a plane A running perpendicular to the longitudinal axis "C" of the injection-nozzle holder 1.
Mounted between the head 17 of the fastening screw 6 and the strap 5 is a spherical washer 18, which rests in an annular recess 19 in the strap 5 matched to the spherical washer.
The cylinder head 3 of the internal combustion engine and the injectionnozzle holder 1 are composed of different 4 materials with different coefficients of thermal expansion. The cylinder head 3 is manufactured from aluminium and the injection-nozzle holder 1 from steel.
The coefficient of thermal expansion of the cylinder head 3 is approximately twice as great as the coefficient of thermal expansion of the injection-nozzle holder 1.
In order to achieve temperature-neutral clamping of these components with different expansions special measures are provided, and these are such as to ensure that the ratio LSchr to LDH corresponds to the ratio a to b.
These have the following specific meanings:
LSchr Screw length obtained from the first load bearing turn of the threaded hole in the cylinder head and the plane running perpendicular to the longitudinal axis of the injection-nozzle holder and intersecting the supporting location in the cylinder head.
L Nozzle-holder length measured from the seat DH end of the nozzle holder to the plane A a Length of that lever arm of the strap which points away from the nozzle holder b Length of the strap consisting of both lever arms.
In the case of components with different coefficients of thermal expansion, such relationships allow a preloading force on the injectionnozzle holder which is at least approximately constant in the hot and in the cold state. Sealing problems are substantially avoided.
Claims (4)
1. A device for fastening an injection-nozzle holder in a receiving hole in a cylinder head of an internal combustion engine, with a fastening screw which is screwed into a threaded hole in the cylinder head and with a strap through which the said screw passes, which strap comprises a twoarmed lever with an effective length (b) and one lever arm of which, with an effective length (a), is supported on the cylinder head, on a supporting location, in a plane (A) lying perpendicular to the longitudinal axis (c) of the injection-nozzle holder, and the other lever arm of which, with the length (b-a) is supported on a f orce- introducing supporting surface on the injection-nozzle holder, which is pressed onto a seat in the receiving hole under a def ined preloading force, a free section, with the length (LSchr), of the fastening screw lying between the plane (A) and the entry to the threaded hole, and a section with the length (LDH) being formed between the plane (A) and the seat end of the injection-nozzle holder, wherein the ratio of the length (a) to the length (b) is at least approximately equal to the ratio of the length (L h) to the length (LDH) L
2. A device according to Claim 1, wherein that lever arm of the strap which points away from the injection-nozzle holder is supported on the cylinder head via a ball, for which matching spherical bearing locations are provided in the lever arm and on the cylinder head.
3. A device according to Claim 1 or 2, wherein a spherical washer, which rests in a correspondingly shaped recess in the strap, is placed between the strap and the head of the fastening screw.
4. A device for fastening an injection-noZZle holder in a receiving hole in an internal combustion engine, substantially as described herein with reference to, and as illustrated in, the accompanying drawing.
4. A device for fastening an injection-nozzle holder in a receiving hole in an internal combustion engine. substantially as described herein with reference to, and as illustrated in, the accompanying drawing.
Amendments to the claims have been filed as follows Claims A device for fastening an injection-nozzle holder in a receiving hole in a cylinder head of an internal combustion engine, with a fastening screw which is screwed into a threaded hole in the cylinder head and with a lug through which the said screw passes, which lug comprises. a two-armed lever with an effective length (b) and one lever arm of which, with an effective length (a), is supported on the cylinder head, on a supporting location, in a plane (A) lying perpendicular to the longitudinal axis (c) of the injection-nozzle holder, and the other lever arm of which, with the length (b-a) is supported on a f orCe- introducing supporting surface on the injection-nozzle holder, which is pressed onto a seat in the receiving hole under a defined preloading force, a free section, with the length (LSchr), of the fastening screw lying between the plane (A) and the entry to the threaded hole, and a section with the length (LDH) being formed between the plane (A) and the seat end of the injection-nozzle holder, wherein the ratio of the length (a) to the length (b) is at least approximately equal to the ratio of the length (LSchr) to the length (LDH) 2. A device according to Claim 1, wherein that lever arm of the lug which points away from the injection-nozzle holder is supported on the cylinder head via a ball, for which matching spherical bearing locations are provided in the lever arm and on the cylinder head.
3. A device according to Claim 1 or 2, wherein a spherical washer, which rests in a correspondingly shaped recess in the lug, is placed between the lug and the head of the fastening screw.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19521363A DE19521363C1 (en) | 1995-06-12 | 1995-06-12 | Device to fasten holder for injection nozzle in engine cylinder head |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9611131D0 GB9611131D0 (en) | 1996-07-31 |
| GB2302136A true GB2302136A (en) | 1997-01-08 |
| GB2302136B GB2302136B (en) | 1997-05-28 |
Family
ID=7764199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9611131A Expired - Fee Related GB2302136B (en) | 1995-06-12 | 1996-05-29 | Device for fastening an injection-nozzle holder |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE19521363C1 (en) |
| FR (1) | FR2735184B1 (en) |
| GB (1) | GB2302136B (en) |
| IT (1) | IT1285151B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2337083A (en) * | 1998-05-09 | 1999-11-10 | Perkins Engines Co Ltd | A fuel injector clamp for an internal combustion engine |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3765132B2 (en) * | 1996-09-06 | 2006-04-12 | 日産自動車株式会社 | Fuel injection nozzle fixing device in direct injection diesel engine |
| FR2756872B1 (en) * | 1996-12-06 | 1999-01-15 | Renault | FIXING DEVICE FOR AN INJECTOR OF AN INTERNAL COMBUSTION ENGINE |
| DE10155678A1 (en) | 2001-11-13 | 2003-05-22 | Bosch Gmbh Robert | Clamp, to lock a fuel injection valve in its drilling through the cylinder head of an IC motor, has a clamp paw which presses symmetrically against a linear bearing surface without a tilting movement |
| DE10241921B3 (en) * | 2002-09-10 | 2004-01-29 | Eaton Fluid Power Gmbh | High-density connection device |
| EP1493916A1 (en) * | 2003-07-02 | 2005-01-05 | Renault s.a.s. | Engine fuel injector clamping |
| DE10340911B4 (en) * | 2003-09-05 | 2014-12-04 | Robert Bosch Gmbh | Adapter sleeve with temperature compensation |
| FR2864170B1 (en) * | 2003-12-19 | 2007-09-07 | Renault Sas | DEVICE FOR POSITIONING AN INJECTOR DOOR FLANGE |
| DE102008001533A1 (en) | 2008-05-02 | 2009-11-05 | Robert Bosch Gmbh | Injector holder assembly assembly with clamping claw |
| CN108708809A (en) * | 2018-07-26 | 2018-10-26 | 江苏农华智慧农业科技股份有限公司 | A kind of fuel injector is fixed and clamped device |
| DE102020004625A1 (en) | 2020-07-30 | 2022-02-03 | Deutz Aktiengesellschaft | injector spillage |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4571161A (en) * | 1984-03-28 | 1986-02-18 | Robert Bosch Gmbh | Pump/nozzle unit for fuel injection in internal combustion engines |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2144708A1 (en) * | 1971-09-07 | 1973-03-15 | Kloeckner Humboldt Deutz Ag | NOZZLE RETAINER SEAL |
| AT350854B (en) * | 1976-08-26 | 1979-06-25 | List Hans | DEVICE FOR FASTENING A FUEL INJECTION NOZZLE RECEIVED IN A BORE OF A CYLINDER HEAD OF A COMBUSTION MACHINE |
| DE4413415C1 (en) * | 1994-04-18 | 1995-06-08 | Daimler Benz Ag | Attachment of fuel injector to cylinder head |
-
1995
- 1995-06-12 DE DE19521363A patent/DE19521363C1/en not_active Revoked
-
1996
- 1996-05-29 GB GB9611131A patent/GB2302136B/en not_active Expired - Fee Related
- 1996-06-07 IT IT96RM000400A patent/IT1285151B1/en active IP Right Grant
- 1996-06-10 FR FR9607152A patent/FR2735184B1/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4571161A (en) * | 1984-03-28 | 1986-02-18 | Robert Bosch Gmbh | Pump/nozzle unit for fuel injection in internal combustion engines |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2337083A (en) * | 1998-05-09 | 1999-11-10 | Perkins Engines Co Ltd | A fuel injector clamp for an internal combustion engine |
| US6196194B1 (en) | 1998-05-09 | 2001-03-06 | Perkins Engines Company Limited | Injector clamp |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2735184A1 (en) | 1996-12-13 |
| GB9611131D0 (en) | 1996-07-31 |
| FR2735184B1 (en) | 1999-05-07 |
| DE19521363C1 (en) | 1996-09-05 |
| IT1285151B1 (en) | 1998-06-03 |
| ITRM960400A0 (en) | 1996-06-07 |
| ITRM960400A1 (en) | 1997-12-07 |
| GB2302136B (en) | 1997-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20030529 |