GB2193262A - Valve assembly - Google Patents
Valve assembly Download PDFInfo
- Publication number
- GB2193262A GB2193262A GB08717320A GB8717320A GB2193262A GB 2193262 A GB2193262 A GB 2193262A GB 08717320 A GB08717320 A GB 08717320A GB 8717320 A GB8717320 A GB 8717320A GB 2193262 A GB2193262 A GB 2193262A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring
- snubber
- valve
- seating member
- flange
- 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
- 239000000446 fuel Substances 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 230000006835 compression Effects 0.000 claims abstract description 6
- 238000007906 compression Methods 0.000 claims abstract description 6
- 230000010349 pulsation Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
- 238000003754 machining Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
-
- 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
- F02M59/46—Valves
- F02M59/462—Delivery valves
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
Abstract
A valve assembly for a fuel injection system of a compression ignition engine includes a snubber valve member 22 biased towards a seating member 18 by a spring 23. The seating member is retained against a flange 15 which is machined during the production of a tubular body 10 housing the snubber valve member 22 and a delivery valve member 27. The snubber valve allows substantially unrestricted flow to the injection nozzle 14 of the engine but restricts the return flow to damp pressure pulsations occurring in the line 13 when the nozzle 14 closes. <IMAGE>
Description
SPECIFICATION
Valve assembly
This invention relates to a snubber and delivery valve assembly for use in a fuel injection system of a compression ignition engine.
A known form of fuel injection system comprises a rotary distributor fuel pump which incorporates a high pressure pump which delivers fuel in turn to a plurality of outlets. The outlets communicate through individual pipe lines with the injection nozzles respectively of the engine. It is known practice to locate a snubber and delivery valve between each outlet and the associated pipe line. The snubber valve is located downstream of the delivery valve in the direction of fuel flow to the engine and essentially it is a valve constructed so as to allow substantially unrestricted flow of fuel to the engine but to restrict the return flow of fuel with the particular object of damping out pressure pulsations which occur in the pipe line due to closure of the valve member of the nozzle.The delivery valve is conventional being provided with an unloading collar whereby a predetermined volume of fuel is returned to the high pressure pump after the end of fuel delivery and before the communication between the high pressure pump and the outlet is broken.
The conventional assembly comprises a tubular body in which is formed a stepped through bore. The snubber valve is formed by a seating member with a through passage and a valve member which is spring loaded into contact with the seating member, the valve member having a restricted through passage.
The snubber valve also includes a sleeve the interior surface of which forms a guide for the valve member, the sleeve at the end adjacent the seating member being slotted to permit unrestricted flow of fuel when the valve member is lifted from the seating. The aforesaid components are located within the bore in the body with the sleeve being located between a step in the body and the seating member and the seating member being secured in position by deforming or staking the material of the body into engagement with a step on the periphery of the seating member. The delivery valve spring engages a spring abutment which in turn engages with the seating member and finally the delivery valve member and its flanged sleeve are located in the bore and are held in place when the body is secured within an outlet of the pump.
It has been found that failure of the assembly tends to occur and examination has shown that the metal which is deformed to secure the seating member of the snubber valve has sheared due, it is assumed, to the high impact loading which occurs during use.
The object of the invention is to provide a snubber and delivery valve assembly in a sim ple and convenient form.
According to the invention a snubber and delivery valve assembly for use in a fuel injection system of a compression ignition engine comprises in combination, a tubular body adapted at its opposite ends to be secured in an outlet of a fuel injection pump and to a pipe line which conveys fuel to an injection nozzle, an apertured flange formed inermediate the ends of the bore defined by the body, a snubber valve seating member located against one side of the flange, a sleeve engaging the seating member and an apertured plug secured within the bore, said plug engaging the sleeve to secure the seating member against the flange, the snubber valve further including a valve member slidable within the sleeve and biased into contact with the seating member by means of a spring, the delivery valve including a spring and a spring abutment for the spring, the spring abutment engaging said flange and a delivery valve member which is engaged by the spring and is urged into contact with a delivery valve seating member by the spring.
An example of a snubber and delivery valve assembly will now be described with reference to the accompanying drawing which is a sectional side elevation through the assembly.
Referring to the drawing the assembly includes a tubular body 10 which at its opposite ends is provided with peripheral screw threads whereby the body can be engaged within the outlet 11 of a fuel injection pump the body of which is to be seen at 12. At its opposite end in use, the body will be engaged by a nut of a pipe connector which is disposed at the end of a pipe line 13 connected to a fuel injection nozzle 14.
The body defines a bore which has an internal flange 15, the flange 15 being formed during the machining of the body. One side of the flange defines a surface 16 extending at right angles to the axis of the body whilst on the other side there is defined a tapered surface 17.
Engaged with the tapered surface is a complementarily shaped surface of a snubber valve seating member 18 and this is held against the surface 17 by means of a sleeve 19 which is secured within a screw threaded portion of the bore in the body by means of a threaded plug 20. The seating member and the plug are apertured as also is the flange 1 5. The sleeve adjacent the seating member 18 is provided with at least one axially extending slot 21 and the internal surface of the sleeve serves as a guide for the snubber valve member 22. This is biased into contact with the seating member by means of a coiled compression spring 23 the opposite end of which engages the plug 20. The smaller valve member 22 has a restricted passage 24 formed therein.
Engaged with the surface 16 is a flanged spring abutment 25 the flange of which is engaged by a coiled compression spring 26 which in turn engages with a delivery valve member 27 slidable within a delivery valve body 28 which is outwardly flanged and which is held in position when the body 10 is secured within the outlet 11. The delivery valve is of conventional construction including an unloading collar 29 and a fluted guide portion. In use, when fuel is supplied by the high pressure pump it flows through the outlet and lifts in known manner, the delivery valve member against the action of its spring. Fuel flows past the delivery valve member, the extent of movement of which is limited by the abutment 25, and through the passage in the abutment 25 towards the snubber valve.
Some fuel will flow through the passage 24 of the snubber valve member but the snubber valve member itself will lift away from the seating member to allow a substantially unrestricted flow of fuel to the injection nozzle.
When the delivery of fuel by the pump ceases, the delivery valve member will move towards the closed position and in so doing will permit a predetermined volume of fuel to be returned to the high pressure fuel pump.
Moreover, the snubber valve member 22 will close onto its seating member 18 so that the return of fuel from the pipe line towards the delivery valve will be at a restricted rate. This restriction acts in known manner to damp out the pressure waves which occur in the pipe line due to the closure of the valve member of the nozzle onto its seating.
In the assembly described the flange 1 5 is formed as a result of machining the metai forming the body and it well able to withstand the impact loading during the use of the valve assembly. The plug 20 may be secured within the bore using a suitable fixing compound such as "Loctite".
Claims (3)
1. A snubber and delivery valve assembly for use in a fuel injection system of a compression ignition engine comprising a tubular body adapted at its opposite ends to be secured in an outlet of a fuel injection pump and to a pipe line which conveys fuel to an injection nozzle, an apertured flange formed intermediate the ends of the bore defined by the body, a snubber valve seating member located against one side of the flange, a sleeve engaging the seating member and an apertured plug secured within the bore, said plug engaging the sleeve to secure the seating member against the flange, the snubber valve further including a valve member slidable within the sleeve and biased into contact with the seating member by means of a spring, the delivery valve including a spring and a spring abutment for the spring, the spring abutment engaging said flange and a delivery valve member which is engaged by the spring and is urged into contact with a delivery valve seating member by the spring.
2. An assembly according to Claim 1 including interengaging screw threads formed in the body and on the plug.
3. A snubber and delivery valve assembly comprising the combination and arrangement of parts substantially as hereinbefore described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB868618839A GB8618839D0 (en) | 1986-08-01 | 1986-08-01 | Valve assembly |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8717320D0 GB8717320D0 (en) | 1987-08-26 |
| GB2193262A true GB2193262A (en) | 1988-02-03 |
| GB2193262B GB2193262B (en) | 1990-03-07 |
Family
ID=10602091
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868618839A Pending GB8618839D0 (en) | 1986-08-01 | 1986-08-01 | Valve assembly |
| GB8717320A Expired - Lifetime GB2193262B (en) | 1986-08-01 | 1987-07-22 | Valve assembly |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868618839A Pending GB8618839D0 (en) | 1986-08-01 | 1986-08-01 | Valve assembly |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE3725566A1 (en) |
| ES (1) | ES2007381A6 (en) |
| FR (1) | FR2602279B1 (en) |
| GB (2) | GB8618839D0 (en) |
| IT (1) | IT1222387B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0384882A2 (en) * | 1989-02-24 | 1990-08-29 | Ail Corporation | Rate control in accumulator type fuel injectors |
| EP0733799A2 (en) * | 1991-02-26 | 1996-09-25 | Ficht GmbH & Co. KG | Fuel injection device for internal combustion engines |
| GB2305468A (en) * | 1995-09-25 | 1997-04-09 | Bosch Gmbh Robert | Fuel injection apparatus for internal combustion engines |
| EP1163448A1 (en) * | 1999-03-18 | 2001-12-19 | Diesel Technology Company | Fuel injection pump and snubber valve assembly |
| WO2018141546A1 (en) * | 2017-02-01 | 2018-08-09 | Robert Bosch Gmbh | Check/throttle valve for a high-pressure accumulator |
| WO2019126858A1 (en) * | 2017-12-27 | 2019-07-04 | Robert Bosch Limitada | Arrangement for a fuel injection system for diesel engines |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3763698B2 (en) * | 1998-10-22 | 2006-04-05 | 株式会社日本自動車部品総合研究所 | Design method of fuel supply system that can relieve pressure pulsation |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2729169A (en) * | 1951-06-19 | 1956-01-03 | Alco Products Inc | Fuel pumping system |
| FR1529222A (en) * | 1967-06-27 | 1968-06-14 | Daimler Benz Ag | Device for injecting fuel into an internal combustion engine |
| DE2306270A1 (en) * | 1973-02-08 | 1974-08-29 | Duap Ag | INJECTION SYSTEM |
| GB2069623B (en) * | 1980-01-18 | 1983-09-21 | Lucas Industries Ltd | Valve for fuel pumping apparatus |
-
1986
- 1986-08-01 GB GB868618839A patent/GB8618839D0/en active Pending
-
1987
- 1987-07-22 GB GB8717320A patent/GB2193262B/en not_active Expired - Lifetime
- 1987-07-29 IT IT21504/87A patent/IT1222387B/en active
- 1987-07-30 ES ES8702241A patent/ES2007381A6/en not_active Expired
- 1987-07-31 FR FR878710942A patent/FR2602279B1/en not_active Expired - Lifetime
- 1987-08-01 DE DE19873725566 patent/DE3725566A1/en not_active Withdrawn
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0384882A2 (en) * | 1989-02-24 | 1990-08-29 | Ail Corporation | Rate control in accumulator type fuel injectors |
| EP0384882A3 (en) * | 1989-02-24 | 1991-04-03 | Ail Corporation | Rate control in accumulator type fuel injectors |
| EP0733799A2 (en) * | 1991-02-26 | 1996-09-25 | Ficht GmbH & Co. KG | Fuel injection device for internal combustion engines |
| EP0733799A3 (en) * | 1991-02-26 | 1996-12-04 | Ficht Gmbh & Co Kg | Fuel injection device for internal combustion engines |
| GB2305468A (en) * | 1995-09-25 | 1997-04-09 | Bosch Gmbh Robert | Fuel injection apparatus for internal combustion engines |
| GB2305468B (en) * | 1995-09-25 | 1997-12-10 | Bosch Gmbh Robert | Fuel-injection device for internal combustion engines |
| US5715795A (en) * | 1995-09-25 | 1998-02-10 | Robert Bosch Gmbh | Fuel injection apparatus for internal combustion engines |
| EP1163448A1 (en) * | 1999-03-18 | 2001-12-19 | Diesel Technology Company | Fuel injection pump and snubber valve assembly |
| EP1163448A4 (en) * | 1999-03-18 | 2004-04-07 | Diesel Tech Co | Fuel injection pump and snubber valve assembly |
| WO2018141546A1 (en) * | 2017-02-01 | 2018-08-09 | Robert Bosch Gmbh | Check/throttle valve for a high-pressure accumulator |
| WO2019126858A1 (en) * | 2017-12-27 | 2019-07-04 | Robert Bosch Limitada | Arrangement for a fuel injection system for diesel engines |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3725566A1 (en) | 1988-02-04 |
| GB8717320D0 (en) | 1987-08-26 |
| GB2193262B (en) | 1990-03-07 |
| IT1222387B (en) | 1990-09-05 |
| FR2602279B1 (en) | 1991-01-11 |
| IT8721504A0 (en) | 1987-07-29 |
| GB8618839D0 (en) | 1986-09-10 |
| FR2602279A1 (en) | 1988-02-05 |
| ES2007381A6 (en) | 1989-06-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950722 |