US3609070A - Fuel injection pumps - Google Patents
Fuel injection pumps Download PDFInfo
- Publication number
- US3609070A US3609070A US856369A US3609070DA US3609070A US 3609070 A US3609070 A US 3609070A US 856369 A US856369 A US 856369A US 3609070D A US3609070D A US 3609070DA US 3609070 A US3609070 A US 3609070A
- Authority
- US
- United States
- Prior art keywords
- spill port
- fuel
- pump
- barrel
- plunger
- 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
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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
- F02M55/001—Pumps with means for preventing erosion on fuel discharge
-
- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
- F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
- F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston
Definitions
- a fuel injection pump includes a pump barrel in which is reciprocably mounted a plunger which has a helical or like groove communicating with a pumping chamber defined at the end of the plunger, there being provided in the pump barrel a spill port through which fuel can escape from the pumping chamber when the port is exposed by the groove, the spill port being fonned in such a manner as to define a wall which is presented to the flow of fuel through the spill port whereby the velocity of such flow is minimized.
- This invention relates to fuel injection pumps of the kind comprising a pump body, a pump barrel mounted within the pump body, a reciprocable plunger slidable within the barrel, a spill groove formed on the plunger, and a spill port formed in the barrel, the spill port opening into a gallery in the pump body and serving when placed in communication with the groove to allow surplus fuel to escape from the pumping chamber of the injection pump.
- the object of the invention is to provide such a pump in a simple and convenient form.
- the spill port is staggered in the form thereby defining a wall presented towards the inner ends of the port, the action of the staggered port being to reduce the velocity at which fuel escapes through the spill port into the gallery.
- FIG. 1 is a sectional side elevation of one example of a fuel injection pump in accordance with the invention.
- a pump body 9 in which is mounted a pump barrel 8.
- the pump body defines a gallery extending around the barrel 8 and the gallery is in communication with a fuel inlet (not shown) formed in the pump body.
- a fuel inlet (not shown) formed in the pump body.
- the barrel is formed an axial bore which accommodates a reciprocable pumping plunger 10 and in use, the plunger is arranged to be moved inwardly by the action of a rotary cam 7 in timed relationship with an associated engine and to be moved outwardly by the action of a coiled compression spring 17.
- the plunger 10 is provided with a helical or like groove 16 which communicates with the pumping chamber and which at some point during the inward movement of the plunger communicates with the port 14 (hereinafter called the spill port) to allow fuel to escape from the pumping chamber into the gallery 15.
- the relative angular setting of the plunger 10 and pump barrel 8 can be adjusted so that the quantity of fuel delivered at each inward stroke of the plunger can be varied. This may be achieved by adjustment of either the plunger or the pump barrel but as shown, the plunger is movable angularly by means of a rack bar 29.
- the spill port 14 is formed in staggered fashion so that the flow of fuel is turbulent.
- the turbulent flow causes restriction to the flow of fuel thereby minimizing the erosion of the wall of the gallery.
- the spill port is defined by inner and outer blind bores the axes of which are offset.
- the inner blind bore is aligned with the spill port 14a and the blind bores communicate with each other to enable fuel flow to occur through the port.
- a wall is provided which faces the inner end of the spill port, the wall acting to promote the turbulent flow of fuel.
- FIGS. 1 and 2 show alternative ways of positioning the outer blind bore relative to the inner bore.
- a fuel injection pump of the kind comprising a pump body, a pump barrel mounted within the pump body, a reciprocable plunger slidable within the barrel and defining a pumping chamber, a spill groove formed on the plunger, a spill port formed in the barrel, a gallery surrounding the pump barrel and into which the spill port opens, said gallery having a wall defined by the body part said spill port serving when placed in communication with the groove to allow surp us fuel to escape from the pumping chamber, said spill port being formed by inner and outer blind bores the axes of which are offset, the blind bores communicating with each other to define a flow-restricting wall presented towards the inner end of the spill port, the action of the wall being to restrict the rate and reduce the velocity at which fuel escaping through the spill port impinges on the wall of the gallery.
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 fuel injection pump includes a pump barrel in which is reciprocably mounted a plunger which has a helical or like groove communicating with a pumping chamber defined at the end of the plunger, there being provided in the pump barrel a spill port through which fuel can escape from the pumping chamber when the port is exposed by the groove, the spill port being formed in such a manner as to define a wall which is presented to the flow of fuel through the spill port whereby the velocity of such flow is minimized.
Description
United States Patent Inventor Stanley Robert Bagshaw Hemel Hempstead, England Appl. No. 856,369 Filed Sept. 9, 1969 Patented Sept. 28, 1971 Assignee C.A.V. Llmlted Warple Way, Acton, London, England Priority Sept. 24, 1968 Great Britain 45242/68 FUEL INJECTION PUMPS 1 Claim, 2 Drawing Figs.
us. Cl 417/494, 417/498 Int. Cl F04b 7/04, F04b 39/10 Field of Search 103/2.l,
References Clted UNITED STATES PATENTS 2,044,814 6/1936 Rothrock 103/154 X 2,325,524 7/1943 Links 103/154 X 2,713,310 7/1955 Muraszew 103/154 X FOREIGN PATENTS 1,033,798 6/1966 Great Britain 103/21 1,238,121 6/1960 France l03/2.1
Primary Examiner-Carlton R. Croyle Assistant Examiner-R. E. Gluck Attorney-Holman & Stern ABSTRACT: A fuel injection pump includes a pump barrel in which is reciprocably mounted a plunger which has a helical or like groove communicating with a pumping chamber defined at the end of the plunger, there being provided in the pump barrel a spill port through which fuel can escape from the pumping chamber when the port is exposed by the groove, the spill port being fonned in such a manner as to define a wall which is presented to the flow of fuel through the spill port whereby the velocity of such flow is minimized.
Q S l2 IAa I Q44 8 7 I |6 9 29 S 1/ I 'g, x 17 FUEL INJECTION PUMPS This invention relates to fuel injection pumps of the kind comprising a pump body, a pump barrel mounted within the pump body, a reciprocable plunger slidable within the barrel, a spill groove formed on the plunger, and a spill port formed in the barrel, the spill port opening into a gallery in the pump body and serving when placed in communication with the groove to allow surplus fuel to escape from the pumping chamber of the injection pump.
The object of the invention is to provide such a pump in a simple and convenient form.
According to the invention in a pump of the kind specified the spill port is staggered in the form thereby defining a wall presented towards the inner ends of the port, the action of the staggered port being to reduce the velocity at which fuel escapes through the spill port into the gallery.
In the accompanying drawings:
FIG. 1 is a sectional side elevation of one example of a fuel injection pump in accordance with the invention, and
FIG. 2 is a view showing a modified part of the pump of FIG. 1.
With reference to FIG. 1 there is provided a pump body 9 in which is mounted a pump barrel 8. The pump body defines a gallery extending around the barrel 8 and the gallery is in communication with a fuel inlet (not shown) formed in the pump body. In the barrel is formed an axial bore which accommodates a reciprocable pumping plunger 10 and in use, the plunger is arranged to be moved inwardly by the action of a rotary cam 7 in timed relationship with an associated engine and to be moved outwardly by the action of a coiled compression spring 17.
During inward movement of the plunger fuel is displaced from the pumping chamber defined by the bore and the end of the plunger 10 past a nonretum valve 12 to an outlet 11 and to an associated injection nozzle 13. During outward movement of the plunger fuel is admitted to the pumping chamber through a pair of diametrical ports 14, 14a formed in the barrel 8 and communicating with the aforesaid gallery. The fuel flows into the pumping chamber when the ports 14, 140 are uncovered during the outward movement of the plunger.
In known manner the plunger 10 is provided with a helical or like groove 16 which communicates with the pumping chamber and which at some point during the inward movement of the plunger communicates with the port 14 (hereinafter called the spill port) to allow fuel to escape from the pumping chamber into the gallery 15. The relative angular setting of the plunger 10 and pump barrel 8 can be adjusted so that the quantity of fuel delivered at each inward stroke of the plunger can be varied. This may be achieved by adjustment of either the plunger or the pump barrel but as shown, the plunger is movable angularly by means of a rack bar 29.
It is well known that the velocity at which the fuel travels through the spill port 14 is very high and erosion of the wall of the gallery can be caused. In order to reduce the velocity the spill port 14 is formed in staggered fashion so that the flow of fuel is turbulent. The turbulent flow causes restriction to the flow of fuel thereby minimizing the erosion of the wall of the gallery. In one example the spill port is defined by inner and outer blind bores the axes of which are offset. The inner blind bore is aligned with the spill port 14a and the blind bores communicate with each other to enable fuel flow to occur through the port. By the provision of the staggered bores a wall is provided which faces the inner end of the spill port, the wall acting to promote the turbulent flow of fuel. FIGS. 1 and 2 show alternative ways of positioning the outer blind bore relative to the inner bore.
I claim:
1. A fuel injection pump of the kind comprising a pump body, a pump barrel mounted within the pump body, a reciprocable plunger slidable within the barrel and defining a pumping chamber, a spill groove formed on the plunger, a spill port formed in the barrel, a gallery surrounding the pump barrel and into which the spill port opens, said gallery having a wall defined by the body part said spill port serving when placed in communication with the groove to allow surp us fuel to escape from the pumping chamber, said spill port being formed by inner and outer blind bores the axes of which are offset, the blind bores communicating with each other to define a flow-restricting wall presented towards the inner end of the spill port, the action of the wall being to restrict the rate and reduce the velocity at which fuel escaping through the spill port impinges on the wall of the gallery.
Claims (1)
1. A fuel injection pump of the kind comprising a pump body, a pump barrel mounted within the pump body, a reciprocable plunger slidable within the barrel and defining a pumping chamber, a spill groove formed on the plunger, a spill port formed in the barrel, a gallery surrounding the pump barrel and into which the spill port opens, said gallery having a wall defined by the body part, said spill port serving when placed in communication with the groove to allow surplus fuel to escape from the pumping chamber, said spill port being formed by inner and outer blind bores the axes of which are offset, the blind bores communicating with each other to define a flow-restricting wall presented towards the inner end of the spill port, the action of the wall being to restrict the rate and reduce the velocity at which fuel escaping through the spill port impinges on the wall of the gallery.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB45242/68A GB1271799A (en) | 1968-09-24 | 1968-09-24 | Fuel injection pumps |
Publications (1)
Publication Number | Publication Date |
---|---|
US3609070A true US3609070A (en) | 1971-09-28 |
Family
ID=10436450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US856369A Expired - Lifetime US3609070A (en) | 1968-09-24 | 1969-09-09 | Fuel injection pumps |
Country Status (5)
Country | Link |
---|---|
US (1) | US3609070A (en) |
DE (1) | DE1947763C3 (en) |
ES (1) | ES371949A1 (en) |
FR (1) | FR2018738A1 (en) |
GB (1) | GB1271799A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4090819A (en) * | 1975-11-05 | 1978-05-23 | Societe D'etudes De Machines Thermiques | Fuel injection pump with cavitation preventing steps along the fuel return flow path |
US4118156A (en) * | 1976-12-01 | 1978-10-03 | Sulzer Brothers Limited | Fuel injection pump having choke means in overflow line |
US4355546A (en) * | 1979-08-09 | 1982-10-26 | Lucas Industries Limited | Reciprocable plunger fuel injection pump |
WO1998048166A1 (en) * | 1997-04-21 | 1998-10-29 | Man B & W Diesel A/S | A fuel injection pump for internal combustion engines, in particular big, slow marine diesel engines |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT362199B (en) * | 1979-04-17 | 1981-04-27 | Friedmann & Maier Ag | INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
AT378243B (en) * | 1982-03-30 | 1985-07-10 | Friedmann & Maier Ag | INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
DE3633899A1 (en) * | 1986-10-04 | 1988-04-07 | Bosch Gmbh Robert | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2044814A (en) * | 1934-03-29 | 1936-06-23 | Addison M Rothrock | Fuel injection system |
US2325524A (en) * | 1940-04-16 | 1943-07-27 | Links Heinz | Fuel injection pump |
US2713310A (en) * | 1951-11-20 | 1955-07-19 | Cav Ltd | Liquid fuel injection pumps |
FR1238121A (en) * | 1958-10-21 | 1960-08-05 | Burmeister & Wains Mot Mask | Improvements to injection systems for internal combustion engines |
GB1033798A (en) * | 1963-09-28 | 1966-06-22 | Bosch Gmbh Robert | Improvements in fuel injection pumps |
-
1968
- 1968-09-24 GB GB45242/68A patent/GB1271799A/en not_active Expired
-
1969
- 1969-09-09 US US856369A patent/US3609070A/en not_active Expired - Lifetime
- 1969-09-16 ES ES371949A patent/ES371949A1/en not_active Expired
- 1969-09-20 DE DE1947763A patent/DE1947763C3/en not_active Expired
- 1969-09-22 FR FR6932123A patent/FR2018738A1/fr not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2044814A (en) * | 1934-03-29 | 1936-06-23 | Addison M Rothrock | Fuel injection system |
US2325524A (en) * | 1940-04-16 | 1943-07-27 | Links Heinz | Fuel injection pump |
US2713310A (en) * | 1951-11-20 | 1955-07-19 | Cav Ltd | Liquid fuel injection pumps |
FR1238121A (en) * | 1958-10-21 | 1960-08-05 | Burmeister & Wains Mot Mask | Improvements to injection systems for internal combustion engines |
GB1033798A (en) * | 1963-09-28 | 1966-06-22 | Bosch Gmbh Robert | Improvements in fuel injection pumps |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4090819A (en) * | 1975-11-05 | 1978-05-23 | Societe D'etudes De Machines Thermiques | Fuel injection pump with cavitation preventing steps along the fuel return flow path |
US4118156A (en) * | 1976-12-01 | 1978-10-03 | Sulzer Brothers Limited | Fuel injection pump having choke means in overflow line |
US4355546A (en) * | 1979-08-09 | 1982-10-26 | Lucas Industries Limited | Reciprocable plunger fuel injection pump |
WO1998048166A1 (en) * | 1997-04-21 | 1998-10-29 | Man B & W Diesel A/S | A fuel injection pump for internal combustion engines, in particular big, slow marine diesel engines |
Also Published As
Publication number | Publication date |
---|---|
FR2018738A1 (en) | 1970-06-26 |
ES371949A1 (en) | 1971-11-16 |
DE1947763B2 (en) | 1974-08-29 |
DE1947763C3 (en) | 1975-04-17 |
DE1947763A1 (en) | 1970-04-02 |
GB1271799A (en) | 1972-04-26 |
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