GB2237074A - Injection pump for fuel supply to an engine - Google Patents
Injection pump for fuel supply to an engine Download PDFInfo
- Publication number
- GB2237074A GB2237074A GB9018810A GB9018810A GB2237074A GB 2237074 A GB2237074 A GB 2237074A GB 9018810 A GB9018810 A GB 9018810A GB 9018810 A GB9018810 A GB 9018810A GB 2237074 A GB2237074 A GB 2237074A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plunger member
- pressure
- chamber
- pump chamber
- lubricating oil
- 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- Withdrawn
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 33
- 238000002347 injection Methods 0.000 title claims abstract description 22
- 239000007924 injection Substances 0.000 title claims abstract description 22
- 239000010687 lubricating oil Substances 0.000 claims abstract description 18
- 238000002485 combustion reaction Methods 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 4
- 230000001965 increasing effect Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000002708 enhancing effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 230000007423 decrease Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
-
- 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
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/442—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers
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
An injection pump comprises a cylinder element (1) defining a cylinder bore (6) into which open an inlet duct (3), and an outlet injection duct (7), a plunger member (2) being reciprocatingly movable within the bore (6) to compress fuel in a pressure space (11) for delivery via the injection duct (7) for instance into a cylinder of an internal combustion engine. The element (1) and the plunger member (2) together define an additional chamber (4) separated from the pressure space (11) and arranged to be filled with lubricating oil. When fuel is compressed in the pressure space (11) lubricating oil fed into said additional chamber is also compressed to seal the clearance (15) between the outer surface of the plunger member (2) and the wall of the cylinder bore (6) and prevent fuel from leaking along the outer surface of the plunger member (2) into said additional chamber (4) and from there into other parts of the engine. <IMAGE>
Description
-1 1 1 INJECTION PUMP FOR FUEL The invention relates to an injection pump
for fuel or the like pressure medium according to the preamble of claim 1.
In an injection pump, usable in an internal combustion engine and in which fuel is first compressed by means of a plunger member in a pump chamber of the pump to be under high pressure so as to be fed further into a cylinder of the engine, fuel can leak due to the high pressure between the outer surface of the plunger member and the inner surface of the pump chamber causing dirt and corrosion. In addition, fuel leaks of this kind can pass into the crankcase and become mixed with the lubricating oil, as a consequence of which the properties of the lubricating oil of the engine are changed in an undesirable way.
The invention aims to achieve a solution, uncomplicated as to construction as well as function, for eliminating this problem.
What constitutes the invention is defined in claim 1 20 and further features thereof are specified in the subclaims. By means of the invention the pump chamber and the plunger member of the injection pump are arranged to define an additional chamber which is filled with lubricating oil and is separated from the pressure space of the pump chamber containing fuel, the arrangement being such that the pressure space of the pump chamber and the volume of the additional chamber are simultaneously affected by the movement of the plunger member. Thus, the plunger member compresses both fuel to be injected and the lubricating oil located in the additional chamber creating a counter pressure in the oil preventing fuel leaks along the outer surface of the plunger member. At the same time lubrication and sealing of the clearance between the plunger member and the inner surface of the pump chamber occurs.
2 By arranging a guiding edge of a step on the plunger member to shroud a feeding aperture of the duct, through which lubricating oil is fed into said additional chamber, it is possible to essentially enhance the pressure and increase the sealing effect of the oil at the very momen-when the pressure of the fuel in the pressure space of the pump chamber is at its maximum and the risk of fuel leaks is at its greatest.
A leaked oil groove can favourably be arranged between the pressure space of the pump chamber and the additional chamber for collecting and leading away redundant oil and possible leaked fuel. Optionally, another groove connected with the inlet duct for fuel can be arranged between the leaked oil groove and the pressure space of the pump chamber for reducing the effect of the high injection pressure of the fuel on the clearance between the pump chamber and the plunger member. Thus, this additicnal groove can prevent fuel from leaking further along the clearance into the leaked oil groove and thereby decreases fuel loss by leakage.
The invention will now be described in detail with reference to the accompanying drawing, the sole figure of which is a sectional view of one embodiment of fuel injection pump according to the invention.
In the drawing the reference numeral I indicates a cylinder element of the injection pump which defines a pump chamber 6 provided with an inlet duct 3 for feeding fuel into the pump and an outlet injection duct 7 for leading fuel from the pump into a pressure contrclled injection valve shown schematically at V. Located 'in the pump chamber 6 is a plunger member 2, which through its reciprocating movement causes fuel to be compressed to high pressure in a pressure space 11 of the pump chamber.
-4 3 The cylinder element 1 also defines an additional chamber 4 to which lubricating oil is fed along a duct 8, the feeding aperture of the duct 8 being designated as 12. A leaked oil groove 13 is arranged between the pressure space 11 of the pump chamber and the additional chamber 4 for collecting redundant lubricating oil and possible leaked fuel and this groove communicates with a duct 9. In addition, between the leaked oil groove 13 and the pressure space 11, an additional groove 14 is provided which is connected via a duct 10 to the-inlet duct 3 for fuel. The duct 10 acts to decrease the pressure of -Fuel in a clearance 15 between the plunger member 2 and the cylinder element 1, so that the pressure of fuel in this clearance 15 is less than the injection pressure.
As will be clear from the drawing, both the plunger member 2 and the pump chamber 6 are stepped so thaz- they jointly define the additional chamber 4. When a guiding edge 5 on the plunger member 2 passes and shrouds the feeding aperture 12 of the lubricating oil duct 8, pressure in the additional chamber 4 is substantially increased atthe same time as the fuel pressure is increasing in zhe pressure space 11. In this way a counter pressure is provided for the fuel located in the pressure space 11 and influencing from there downwards (as shown in the drawing) in the clearance 15. At the same time the lubricating oil tightens the seal between the outer surface of the plunger member 2 and the inner surface of the pump chamber 6 and provides lubrication for said. surfaces. Any fuel which leaks down can only leak as far as the leaked ci] groove 13, where it, together with redundant lubricating oil, can be led away through the duct 9. The additional groove 14 acts to prevent leakage of the fuel down to the leaked oil groove 13 by decreasing the effect of the injection pressure prevailing in the pressure space 11 on the clearance 15 between the inner surface of the pump chamber 6 and the outer surface of the plunger member 2.
-1 4 The invention is not limited to the embodiment shown, since several modifications to the arrangement shown are feasible within the scope of the following claims.
i z
Claims (6)
1. An injection pump for fuel or the like pressure medium, comprising a cylinder element, which. incluces a pump chamber provided with a pressure medium inlet duct and 5 a pressure medium outlet injection duct, and a plunger member reciprocatable within the pump chamber, movement of the plunger member causing the pressure medium to be compressed to high pressure in a pressure space of the pump chamber further to be fed via the injection duct for 10 instance into a cylinder of an internal combustion engine, wherein the pump chamber and the plunger member together define an additional chamber surrounding the out-er surface of the plunger member and formed by providing steps in the pump chamber and on the plunger member, said addiConal 15 chamber being separated from said pressure space and arranged to be filled with lubricating oil, whereby during compression of the pressure medium in said pressure space. s movement the plunger member is simultaneously through it arranged to compress also the lubricating oil fed into said additional chamber so that the lubricating oil, due to the increased pressure, lubricates and seals a clearance between the outer surface of the plunger member and the inner wall of the pump chamber and prevents the pressure medium from leaking past the outer surface of the plunger member into said additional chamber.
2. An injection Pump according to claim 1, in which an inlet duct for lubricating oil is connected to said additional chamber and said step on the plunger member defines a guiding edge arranged to shroud a feeding aper- ture of said oil inlet duct for enhancing the pressure and increasing the sealing effect of the lubricating oil when the pressure of the pressure medium in the pressure space is at its maximum.
3. An injection Pump according to claim 1 or 2, in 6 which a leaked oil groove is arranged between the pressure space of the pump chamber and said additional chamber for collecting and leading away redundant lubricating oil and possible leaked pressure medium.
4. An injection pump according to claim 3, in which another groove in communication with the inlet duct for pressure medium is arranged between said leaked oil groove and the pressure space of the pump chamber for decreasing the pressure of the pressur e medium in the clearance between the inner wall of the pump chamber and the outer surface of the plunger member.
5. An internal combustion engine injection fuel pump substantially as shown in the accompanying drawing.
Published 1991 atIbe Patent Office. State House. 66/71 H%hHoThom. London WCIR47?.FurLher copies maybe obtained from Sales Branch. Unit
6. Nine Mile Point Cwmrclinf2ch. Cross Keys. Newport. NPI 7HZ. Printed by Multiplex techniques ltd. St Mary Cray. Kent.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI894055A FI84093C (en) | 1989-08-30 | 1989-08-30 | INSPRUTNINGSPUMP FOER BRAENSLE. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9018810D0 GB9018810D0 (en) | 1990-10-10 |
| GB2237074A true GB2237074A (en) | 1991-04-24 |
Family
ID=8528911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9018810A Withdrawn GB2237074A (en) | 1989-08-30 | 1990-08-29 | Injection pump for fuel supply to an engine |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE4026689A1 (en) |
| FI (1) | FI84093C (en) |
| GB (1) | GB2237074A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6805105B2 (en) | 2001-06-19 | 2004-10-19 | Denso Corporation | Fuel supply system for alternative fuel |
| EP1881191A3 (en) * | 2006-07-20 | 2009-04-29 | Hitachi, Ltd. | High-pressure fuel pump |
| WO2009058337A1 (en) * | 2007-11-01 | 2009-05-07 | Caterpillar Inc. | High pressure pump and method of reducing fluid mixing within same |
| WO2009083641A1 (en) * | 2008-01-02 | 2009-07-09 | Wärtsilä Finland Oy | A method and apparatus for testing the piston of an injection pump |
| CN101929394A (en) * | 2009-06-17 | 2010-12-29 | 株式会社电装 | Fuel state sensing device |
| US8061328B2 (en) | 2005-03-09 | 2011-11-22 | Caterpillar Inc. | High pressure pump and method of reducing fluid mixing within same |
| EP2530315A1 (en) * | 2011-06-02 | 2012-12-05 | Delphi Technologies Holding S.à.r.l. | Fuel pump lubrication |
| CN104595075A (en) * | 2014-12-08 | 2015-05-06 | 余姚市舒春机械有限公司 | Wear-resisting oil injection pump plunger and barrel assembly of lubricating structure |
| CN104696128A (en) * | 2015-01-15 | 2015-06-10 | 东风朝阳朝柴动力有限公司 | Fuel injection pump with ventilation function |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4409555C2 (en) * | 1994-03-19 | 2003-04-17 | Caterpillar Motoren Gmbh & Co | Device for generating pressure for a pressure oil lock of an injection pump |
| DE19527719A1 (en) * | 1995-07-31 | 1997-02-06 | Woodward Governor Germany Gmbh | Fuel injection system |
| AT6427U1 (en) * | 2000-05-18 | 2003-10-27 | Avl List Gmbh | METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE OPERATING WITH LIQUID GAS |
| ITPN20000066A1 (en) * | 2000-10-20 | 2002-04-20 | Wartsila Nsd Italia Spa | POWER SUPPLIES PERFECTED IN DIESEL ENGINES NAMED "COMMON RAIL" |
| DE10134068A1 (en) * | 2001-07-13 | 2003-01-30 | Bosch Gmbh Robert | Internal combustion engine, in particular for motor vehicles |
| JP4386030B2 (en) | 2005-12-02 | 2009-12-16 | トヨタ自動車株式会社 | High pressure pump |
| DE102007019909B4 (en) * | 2007-04-27 | 2019-07-11 | Man Energy Solutions Se | Fuel pump with leakage grooves |
| DE202011108107U1 (en) * | 2011-11-19 | 2013-02-21 | Adriaan Verstallen | Stepped piston pump for pumping four different liquids with a seal and lubrication of the stepped piston exclusively by means of a lubricious liquid via grooves on the piston circumference |
| CN108533430B (en) * | 2018-05-07 | 2023-12-19 | 梁跃中 | Super-high pressure fuel pump structure of diesel engine |
| CN117267115A (en) * | 2023-11-20 | 2023-12-22 | 中船动力研究院有限公司 | Sealing structure of plunger type movement mechanism |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB285675A (en) * | 1927-03-29 | 1928-02-23 | Poul Arne Scott Iversen | Improvements in pumps |
| GB834710A (en) * | 1957-09-04 | 1960-05-11 | Su Carburetter Co Ltd | Improvements relating to fuel-injection pumps for compression-ignition internal combustion engines |
| GB852430A (en) * | 1956-12-27 | 1960-10-26 | Sigma Lutin | Piston or plunger pumps |
-
1989
- 1989-08-30 FI FI894055A patent/FI84093C/en not_active IP Right Cessation
-
1990
- 1990-08-23 DE DE4026689A patent/DE4026689A1/en not_active Withdrawn
- 1990-08-29 GB GB9018810A patent/GB2237074A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB285675A (en) * | 1927-03-29 | 1928-02-23 | Poul Arne Scott Iversen | Improvements in pumps |
| GB852430A (en) * | 1956-12-27 | 1960-10-26 | Sigma Lutin | Piston or plunger pumps |
| GB834710A (en) * | 1957-09-04 | 1960-05-11 | Su Carburetter Co Ltd | Improvements relating to fuel-injection pumps for compression-ignition internal combustion engines |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6805105B2 (en) | 2001-06-19 | 2004-10-19 | Denso Corporation | Fuel supply system for alternative fuel |
| US8061328B2 (en) | 2005-03-09 | 2011-11-22 | Caterpillar Inc. | High pressure pump and method of reducing fluid mixing within same |
| EP1881191A3 (en) * | 2006-07-20 | 2009-04-29 | Hitachi, Ltd. | High-pressure fuel pump |
| US8382458B2 (en) | 2006-07-20 | 2013-02-26 | Hitachi, Ltd. | High-pressure fuel pump |
| WO2009058337A1 (en) * | 2007-11-01 | 2009-05-07 | Caterpillar Inc. | High pressure pump and method of reducing fluid mixing within same |
| US8261718B2 (en) | 2007-11-01 | 2012-09-11 | Caterpillar Inc. | High pressure pump and method of reducing fluid mixing within same |
| CN101842579B (en) * | 2007-11-01 | 2013-04-24 | 卡特彼勒公司 | High pressure pump and method of reducing fluid mixing in a high pressure pump |
| KR101489696B1 (en) | 2008-01-02 | 2015-02-04 | 바르실라 핀랜드 오이 | A method and apparatus for testing the piston of an injection pump |
| WO2009083641A1 (en) * | 2008-01-02 | 2009-07-09 | Wärtsilä Finland Oy | A method and apparatus for testing the piston of an injection pump |
| US8220321B2 (en) | 2008-01-02 | 2012-07-17 | Wärtsilä Finland Oy | Method and apparatus for testing the piston of an injection pump |
| CN101929394A (en) * | 2009-06-17 | 2010-12-29 | 株式会社电装 | Fuel state sensing device |
| CN101929394B (en) * | 2009-06-17 | 2013-10-30 | 株式会社电装 | Fuel state sensing device |
| EP2530315A1 (en) * | 2011-06-02 | 2012-12-05 | Delphi Technologies Holding S.à.r.l. | Fuel pump lubrication |
| CN103703247A (en) * | 2011-06-02 | 2014-04-02 | 德尔福技术控股有限公司 | Improvements to fuel pumps |
| WO2012163686A3 (en) * | 2011-06-02 | 2013-12-05 | Delphi Technologies Holding S.A.R.L. | Improvements to fuel pumps |
| US9291132B2 (en) | 2011-06-02 | 2016-03-22 | Delphi International Operations Luxembourg S.A.R.L. | Fuel pump assembly |
| CN104595075A (en) * | 2014-12-08 | 2015-05-06 | 余姚市舒春机械有限公司 | Wear-resisting oil injection pump plunger and barrel assembly of lubricating structure |
| CN104595075B (en) * | 2014-12-08 | 2017-07-28 | 余姚市舒春机械有限公司 | A kind of wear-resisting type plunger and bare of injection pump with lubrication system |
| CN104696128A (en) * | 2015-01-15 | 2015-06-10 | 东风朝阳朝柴动力有限公司 | Fuel injection pump with ventilation function |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4026689A1 (en) | 1991-03-07 |
| FI894055A7 (en) | 1991-03-03 |
| GB9018810D0 (en) | 1990-10-10 |
| FI84093C (en) | 1991-10-10 |
| FI894055A0 (en) | 1989-08-30 |
| FI84093B (en) | 1991-06-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |