US3767123A - Fuel injection nozzle holder seal - Google Patents
Fuel injection nozzle holder seal Download PDFInfo
- Publication number
- US3767123A US3767123A US00229455A US3767123DA US3767123A US 3767123 A US3767123 A US 3767123A US 00229455 A US00229455 A US 00229455A US 3767123D A US3767123D A US 3767123DA US 3767123 A US3767123 A US 3767123A
- Authority
- US
- United States
- Prior art keywords
- nozzle holder
- differential valve
- adjusting screw
- fuel injection
- bore
- 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 - Lifetime
Links
Images
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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
Definitions
- ABSTRACT A fuel injection nozzle holder assembly and a differential valve pressure adjusting screw for accurately maintaining the differential valve opening pressure and lift.
- the conventional fuel injection nozzle assembly includes a nozzle holder connected to a nozzle containing the differential valve.
- the nozzle holder is threaded on its internal periphery and threadedly receives an adjusting screw.
- a lock nut and a nozzle holder cap also threadedly engage the external periphery of the adjusted screw.
- the conventional construction includes a seal on the external periphery of the adjusting screw and spaced between the nozzle holder and the lock nut, as well as between the locknut and the nozzle cap to seal the low pressure side of the nozzle assembly.
- the adjusting screw can be adjusted to vary the force of the spring biasing the spindle against the differential valve to control the opening pressure of the differential valve.
- the low pressure or drain side of the nozzle assembly transmits fluid around the spindle and through the spring chamber to a drain passage.
- the spring exerts a considerable downward force counteracting the hydraulic pressure on the nozzle needle. This force can be on the order of eighty pounds or more.
- the exact amount of the force is regulated by means of a pressure adjusting screw which is threaded in and out of the holder assembly in order to achieve the same nominal nozzle. opening pressure for all assemblies of the given model.
- the space surrounding the spindle and spring is filled with low pressure fuel which has leaked by the nozzle needle and flows through the nozzle holder cap and appropriate tubing back to the fuel tank.
- the fuel usually flushes the small metal particles generated by the screw adjustment away from the walls and the force of gravity causes them to settle in the lowest point of the nozzle interior.
- the nozzle is directed downward and consequently the metal particles finally settle on the top of the needle shoulder.
- the nozzle needle lift is limited by the clearance between the'needle shoulder and the lower face of the holder body'against which it abuts.
- the needle lift can be typically as small as 0.01 of an inch and a small chip of, for example, 0.005 of an inch thickness can cut the effective nozzle lift by half, causing undue restriction during the injection of fuel and resulting in a lower power output from the corresponding engine cylinder, usually accompanied by increased smoke;
- this invention proposes to eliminate a possibility of metal chips interfering with the nozzle lift.
- a sealing ring has been placed below the threads of the pressure adjusting screw.
- the pressure adjusting screw has an extended portion below the threads with a smooth outside diameter which cooperates with the seal ring.
- the objects of this invention are accomplished by providing a nozzle holder with a differential valve in a nozzle assembly connected to the lower end of the nozzle holder and forming a bore extending centrally through the holder forreceiving a spindle.
- An enlarged spring chamber is formed by the adjusting screw which is threadedly received in an enlarged counterbored portion of the nozzle holder.
- a lock nut similarly threadedly engages the external periphery of the adjusting screw and locks against the upper surface of the nozzle holder to lock the nozzle assembly and retain the spring length and force at the desired differential valve opening pressure.
- a smooth cylindrical portion of the nozzle holder and the adjusting screw immediately below the threaded portion engage a seal to seal the spring chamber from the outside of the nozzle holder.
- the seal prevents foreign material from the threaded portion of adjusting screw from entering the return passages which return fuel from the nozzle assembly. This permits maintaining a constant differential valve lift and closing pressure.
- FIG. 1 illustrates a cross section view of the fuel injection nozzle.
- FIG. 2 illustrates a side view of the fuel injection nozzle shown in FIG. 1.
- FIG. 3 is an enlarged cross section view of the adjusting screw, the nozzle holder, and the differential valve closing spring assemblies.
- FIG. 4 is an enlarged cross section view of the lower portion of the nozzle assembly including the differential valve.
- FIG. 1 and FIG. 2 illustrate two views of the fuel injection nozzle assembly.
- the nozzle holder 1 is formed with an inlet passage 2 adapted for connection to the fuel supply.
- the drain passage 3 is adapted for connection to a drain conduit to return fuel to the fuel tank.
- Low pressure fuel is sup plied through the inlet passage 2 and 4 to the differential valve chamber 5.
- the differential valve 6 controls the discharge of fluid through the orifices 7 of the nozzle tip.
- the differential valve 6 opens to permit discharge of high pressure fuel when the pressure in the chamber 5 reaches a predetermined value.
- the nozzle assembly 8 is fastened to the lower portion of the nozzle holder 1 by a nozzle retaining nut 9 and is aligned by the dowel pin 10.
- the nozzle holder 1 is formed with a central bore 11 which receives the spindle 12 which seats on the upper end of the differential valve needle 13.
- the spindle 12 forms a spring seat 14 which seats the spring 15.
- a washer 16 engages the upper end of the spring 15 of the adjusting screw 17.
- the adjusting screw 17 is threaded on its external periphery and threadedly engages the threaded portion 18 of the nozzle holder in the enlarged opening 19 of its upper end.
- the enlarged opening 19 of the nozzle holder also has a cylindrical lower surface 20.
- the annular groove 21 receives the seal 22.
- the screw 17 also has a lower cylindrical surface 23 which engages the seal 21 to seal the drain passage 3 and spring chamber 24.
- the adjusting screw 17 is threaded on its external periphery and threadedly engages the threaded portion of the nozzle holder to provide adjustment of the length of spring 15 for controlling the opening pressure of the differential valve 6.
- the lock nut 25 also threadedly engages adjusting screw l7 and locks the screw 17 with the holder 1 to set the opening pressure of the differential valve at a predetermined value.
- Low pressure fuel is supplied through the inlet passage 2 which in turn is supplied to the chamber in the differential valve 6.
- the pressure in the chamber 5 drastically increases causing the differential valve needle 13 to lift permitting the discharge of high pressure fuel through the orifices 7 of the nozzle assembly 8.
- Fuel injection continues only for the period at which the pressure in the chamber 5 is sufficient to overcome the force of the spring biasing the differential valve needle 13 toward a closed position.
- the spring 15 is compressively positioned between the washer 16 in the adjusting screw 17 and the spindle 12 to produce a heavy force on the spindle to bias the differential valve 6 to a closed position when there is no fuel injection.
- the adjusting screw 17 extends downwardly into the chamber 24 and can be adjustably screwed upwardly or downwardly by the hexagon head 26.
- the lock nut 25 is tightened against the upper surface 27 of the holder 1.
- the opening of the differential valve is limited by the shoulder 28 of the differential valve needle 13 which abuts against the abutting surface 29 of the nozzle holder.
- the clearance between the shoulder 28 and the surface 29 is in the order of 0.010 of an inch. Accordingly, it is necessary that foreign material such as shavings, burrs, and so on, are prevented from falling into i in the drain passage 3 or spring chamber 24 and depositing into the lower portion of the bore 11.
- the seal 22 below the threaded portions of the screw 17 and the nozzle holder I prevent chips, burrs and shavings generated by the screw threads from falling into the bore 11 and depositing on the differential valve shoulder 28.
- a fuel injection nozzle holder assembly comprising a nozzle holder defining a central bore having a threaded internal portion on its upper end, a nozzle including a differential valve connected to the lower end of said nozzle holder with said differential valve connected with said bore, a differential valve opening pressure adjusting screw having a cylindrical lower portion and a threaded upper portion threadedly engaging the threaded portion of said holder, a differential valve needle in said differential valve, a spindle and differential valve closing spring compressively positioned between said adjusting screw and said differential valve needle, a valve movement limiting means limiting the opening movement of said differential valve including a shoulder defined by said differential valve needle, an abutting surface on said nozzle holder for engaging said shoulder when said valve is open, a seal positioned between the threaded portion of said adjusting screw and said valve movement limiting means, said seal engaging the bore of said holder and the cylindrical surface of said adjusting screw and providing a fluid tight seal preventing particles loosened from the threaded portion of said nozzle holder when
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
Description
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US22945572A | 1972-02-25 | 1972-02-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3767123A true US3767123A (en) | 1973-10-23 |
Family
ID=22861321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00229455A Expired - Lifetime US3767123A (en) | 1972-02-25 | 1972-02-25 | Fuel injection nozzle holder seal |
Country Status (3)
Country | Link |
---|---|
US (1) | US3767123A (en) |
CA (1) | CA967845A (en) |
GB (1) | GB1363614A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4783009A (en) * | 1987-04-27 | 1988-11-08 | Brunswick Corporation | Calibration adjustment of electromagnetic fuel injectors |
US4957085A (en) * | 1989-02-16 | 1990-09-18 | Anatoly Sverdlin | Fuel injection system for internal combustion engines |
US5271566A (en) * | 1992-10-21 | 1993-12-21 | D. B. Smith & Company, Inc. | Self-orienting spray nozzle system |
US20180306156A1 (en) * | 2015-10-08 | 2018-10-25 | Continental Automotive Gmbh | Valve Assembly For An Injection Valve |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19611872A1 (en) * | 1996-03-26 | 1997-10-02 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
DE19913286A1 (en) * | 1999-03-24 | 2000-10-12 | Man B & W Diesel Ag | Injector |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3093310A (en) * | 1962-11-13 | 1963-06-11 | Jemnco Corp | Compression pressure fuel injector |
US3146949A (en) * | 1961-10-16 | 1964-09-01 | Cummins Engine Co Inc | Fuel injector |
US3511443A (en) * | 1967-05-23 | 1970-05-12 | Cav Ltd | Liquid fuel injection nozzle units |
GB1215584A (en) * | 1967-06-27 | 1970-12-09 | Bryce Berger Ltd | Liquid fuel injection pumps |
-
1972
- 1972-02-25 US US00229455A patent/US3767123A/en not_active Expired - Lifetime
- 1972-09-18 CA CA151,989A patent/CA967845A/en not_active Expired
-
1973
- 1973-02-16 GB GB776273A patent/GB1363614A/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3146949A (en) * | 1961-10-16 | 1964-09-01 | Cummins Engine Co Inc | Fuel injector |
US3093310A (en) * | 1962-11-13 | 1963-06-11 | Jemnco Corp | Compression pressure fuel injector |
US3511443A (en) * | 1967-05-23 | 1970-05-12 | Cav Ltd | Liquid fuel injection nozzle units |
GB1215584A (en) * | 1967-06-27 | 1970-12-09 | Bryce Berger Ltd | Liquid fuel injection pumps |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4783009A (en) * | 1987-04-27 | 1988-11-08 | Brunswick Corporation | Calibration adjustment of electromagnetic fuel injectors |
US4957085A (en) * | 1989-02-16 | 1990-09-18 | Anatoly Sverdlin | Fuel injection system for internal combustion engines |
USRE35079E (en) * | 1989-02-16 | 1995-11-07 | Sverdlin; Anatoly | Fuel injection system for internal combustion engines |
US5271566A (en) * | 1992-10-21 | 1993-12-21 | D. B. Smith & Company, Inc. | Self-orienting spray nozzle system |
US20180306156A1 (en) * | 2015-10-08 | 2018-10-25 | Continental Automotive Gmbh | Valve Assembly For An Injection Valve |
Also Published As
Publication number | Publication date |
---|---|
DE2309134A1 (en) | 1973-09-06 |
GB1363614A (en) | 1974-08-14 |
DE2309134B2 (en) | 1975-05-22 |
CA967845A (en) | 1975-05-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: WOODS KATHLEEN D., AS TRUSTEE Free format text: SECURITY INTEREST;ASSIGNOR:ALLIS-CHALMERS CORPORATION A DE CORP.;REEL/FRAME:004149/0001 Effective date: 19830329 Owner name: CONNECTICUT NATIONAL BANK THE, A NATIONAL BANKING Free format text: SECURITY INTEREST;ASSIGNOR:ALLIS-CHALMERS CORPORATION A DE CORP.;REEL/FRAME:004149/0001 Effective date: 19830329 |
|
AS | Assignment |
Owner name: DEUTZ-ALLIS CORPORATION BOX 933, MILWAUKEE, WI 53 Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ALLIS-CHALMER CORPORATION A DE CORP;REEL/FRAME:004434/0722 Effective date: 19850627 |
|
AS | Assignment |
Owner name: WHIRLPOOL FINANCIAL CORPORATION, A DE CORP., MICHI Free format text: SECURITY INTEREST;ASSIGNOR:DEUTZ-ALLIS CORPORATION;REEL/FRAME:005356/0744 Effective date: 19900621 |