GB2089903A - Device for adjustment of the quantities of fuel delivered by the pump units of a fuel injection pump - Google Patents
Device for adjustment of the quantities of fuel delivered by the pump units of a fuel injection pump Download PDFInfo
- Publication number
- GB2089903A GB2089903A GB8137701A GB8137701A GB2089903A GB 2089903 A GB2089903 A GB 2089903A GB 8137701 A GB8137701 A GB 8137701A GB 8137701 A GB8137701 A GB 8137701A GB 2089903 A GB2089903 A GB 2089903A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pump
- recess
- fuel injection
- injection pump
- adjusting
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 29
- 239000007924 injection Substances 0.000 title claims abstract description 29
- 239000000446 fuel Substances 0.000 title claims abstract description 28
- 239000004411 aluminium Substances 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012858 resilient material 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
- 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
- F02M59/48—Assembling; Disassembling; Replacing
-
- 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
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 comprising pump units each including a piston 3 slidable in a cylinder 2 has at least one adjusting element (15) which is rotatable in a bore 12 of the pump housing (1) and which has a pin (16) formed eccentrically thereon. The pin (16) enters a first recess (17) located in the pump cylinder (2) whereby the delivery quantity is adjusted by turning of the adjusting element (15). After adjustment has been effected the element (15) is permanently secured against turning and displacement by means of a plastically deformable retaining element (14) e.g. of aluminium. A further recess (13) is disposed in the housing (1) directly contiguous to the bore (12). The recess (13) accommodates the retaining element. The adjusting element (15) extends up to the retaining element (14) which is pressed in between the housing (1) and the adjusting element. To ensure that the adjusting device is not displaced even under the action of large forces, a head (26) having a polygonal cross section is formed on the adjusting element in the region of the retaining element (14). <IMAGE>
Description
SPECIFICATION
Device for adjustment of the quantities of fuel delivered by the pump elements of fuel injection pumps
The invention relates to a fuel injection pump having several pump units and at least one device for pre-adjusting the quantities of fuel delivered by the individual pump units.
In a known adjusting device (British Patent
Specification 1 273 018), adjusting elements are fitted in bores located in a pump housing and are secured against turning relative to the pump housing by means of O-ring seals which are made from resilient material and which are subjected to initial stress. The bores are closed by means of closure discs. The closure discs prevent the adjusting elements from dropping out of the pump housing and prevent them from being unintentionally adjusted from the outside. The individual pump elements are occasionally removed from the pump housing and refitted in order to service the fuel injection pump.When fitting the pump elements, it is quite possible that, when a pump element is incorrectly angularly aligned relative to the adjusting bolt, the adjusting bolt will be displaced, unintentionally and unnoticed, from the inside by the pump element against the frictional forces produced by the
O-ring seal.
A fuel injection pump in accordance with the invention comprises pump units each having a pump piston with an oblique control edge and a pump cylinder rotatably disposed in a bore in the housing of the injection pump and at least one device for individually pre-adjusting the delivery quantities of the pump units, which device comprises a recess incorporated in the periphery of the pump cylinder, an adjusting element having a cylindrical shank which is aligned at right angles to the pump cylinder and is rotatably disposed in a bore in the pump housing, and a pin which is formed eccentrically on the shank and engages the recess in the pump cylinder for the purpose of adjusting the pump cylinder by rotation of the adjusting element and a retaining element for securing the adjusting pin in position, at least one further recess being provided in the housing of the pump directly contiguously to the respective bore therein so that the adjusting element extends into the said second recess, and the retaining element being pressed into the second recess between the housing and the adjusting element.
This has the advantage that the adjusting element or elements of the adjusting device are additionally secured against unintentional displacement when inserting pump elements into the pump housing.
If the retaining elements are made of a material, such as metal and particularly aluminium which is soft compared with the materials of the housing and the adjusting element, the efficacy of the adjusting device is not impaired even after the fuel injection pump has been in operation for a long period of time. A space-saving type of construction is rendered possible if the retaining element is of substantially disc-like shape and has an edge region which is substantially adapted to the cross section of the adjusting element and a further edge region which is located opposite to the aforesaid edge region and which is substantially adapted to the cross section of the second recess. If the retaining element is dished, it can be fitted into the fuel injection pump without difficulty.
The adjusting element preferably has an enlarged head disposed in the recess and having a roughened or non-circular periphery so that the adjusting element is reliably secured against turning and displacement even when it is subjected to very large forces.
The invention is further described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a longitudinal section through one embodiment of injection pump according to the invention;
Fig. 2 is a cross section taken along the line Il-Il of Fig. 1;
Fig. 3 is a fragmentary side elevation of the adjusting device of Figs. 1 and 2;
Fig. 4 is an elevation of a component of the embodiment of Fig. 1 in its starting or initial state; and
Fig. 5 is a sectional view taken along the line V-V of Fig. 4.
A pump unit is disposed in a housing 1, only partially illustrated, of a fuel injection pump which is suitable for fitting into a bore in an engine housing M. The pump assembly comprises a pump cylinder 2 and a pump piston 3. The injection end of the pump cylinder 2 is closed by a pressure valve having a valve body 4 and a movable valve member 5. The pump piston 3 is driven by a cam (not illustrated) against the force of a return spring 6.
A transverse member 7 is mounted on the pump piston and engages slots 8 in a control sleeve 9. The control sleeve 9 has peripheral teeth 10 which engage a toothed rack 1 The toothed rack 11 is at right angles to the longitudinal axis of the pump cylinder 2.
The housing has a radial bore 12 whose end remote from the pump cylinder 2 has a recess 13.
A retaining element 14 is fitted in the said recess.
The bore 1 2 receives an adjusting element 1 5 which has a pin 1 6 formed eccentrically thereon.
The pin 1 6 engages a recess 17, in the form of a longitudinal groove, in the pump cylinder 2.
The cylindrical shank 25 of the adjusting element 1 5 has an annular groove 18 in which an
O-ring seal 1 9 is disposed under initial stress.
Furthermore, the adjusting element 1 5 has a slot 20 for the insertion of an adjusting tool which serves to turn the adjusting element. The O-ring seal 1 9 serves as a retaining element for temporarily securing the adjusting element 1 5 in position after the adjusting tool has been removed. A head 26 having a hexagonal cross section is contiguous to the shank 25 at the end thereof remote from the eccentric pin 1 6.
Alternatively, any optional polygonal cross section, such as a corrugated cross section, can be provided instead of the hexagonal cross section.
Alternatively, it is sufficient, in itself, to roughen the head. The cross section of the head 26 is larger than that of the shank 25. The flank of the head facing the shank abuts against the bottom surface 27 of the recess 1 3, this bottom surface being aligned substantially transversely of the bore 12. A pilot 28 incorporating the slot 8 is formed on the head 26. The pilot 28 subsequently serves as an aid for aligning and inserting the retaining element 14 into the recess 1 3. In order to facilitate manufacture, the recess 13 is of cylindrical configuration and is disposed eccentrically of the bore 12 and has a rough surface.
The retaining element 14 is of substantially disc-like construction. It has an approximately crescent-shaped contour adapted to the recess 1 3 offset relative to the bore 12. The element 14 has an edge region 29 which is aligned with the contour of the recess 13, and an edge region 30 which faces the head 26 and the pilot 28. In order to be able conveniently to insert the retaining element 14 into the recess and to guide it to the pilot 28, the retaining element when in its initial or starting state is of cup-shape or is dished in some other manner (Fig. 5). The retaining element 14 is made from a plastically deformable material, such as aluminium, which has a yield point which is lower than that of the adjusting element 1 5 and of the housing 1 of the pump.
The pump piston 3 has a control surface 22 which is defined by an oblique control edge and which cooperates with a control port (spill port) 23 in the pump cylinder 2. The delivery quantity is varied in a known manner by angularly displacing the pump piston about its longitudinal axis. The quantities to be delivered leave the pump cylinder 2 along the valve member 5.
After loosening a pipe closure 24, partially illustrated in Fig.1, located above the pump cylinder 2, the pump cylinder 2 can be turned relative to the pump piston 3 by rotating the adjusting element 1 5. For a given position of the toothed rack 11 , the delivery quantity of the pump piston can thereby be matched to the delivery quantities of other pump pistons which are disposed behind the pump piston illustrated in
Fig. 1 and which belong to other pump units controlled by the rack 11. After the adjustment has been made, the pump cylinder 2 is clamped in the housing by tightening the pipe closure 24. The adjusting element 1 5 secured in position by the resilient O-ring seal thereby prevents the pump cylinder 2 from turning.After the clamping operation, the edge region 30 of the retaining element 14 is applied to the pilot 28, and the retaining element is brought into register with the recess 1 3 and is inserted into the latter. The retaining element 14 is pressed in around the pilot 28 and around the head 26 by means of a stamping tool (not illustrated). The edge region 30 of the retaining element 1 4 is thereby applied to the head, the edge region 29 is applied to the recess 13, and one side of the retaining element 14 is applied to the bottom 27 of the recess 13.
When in the pressed-in state, a portion of the rim region 30 partly embraces the head 26, and another portion of the rim region 30 partly embraces the head 26 (Figs. 1,2, 3). The adjusting element 1 5 is thereby permanently secured against turning and dropping out of the housing 1. The adjusting element is secured in the opposite direction by means of the head 26 and the bottom 27 of the recess 13. Alternatively, an annular retaining element which embraces the head 26 and the pilot 28 can be used instead of the crescent-shaped retaining element 14. For this purpose, it is only necessary for the diameter of the recess 13 to be larger and concentric to the bore 12. It is also pointed out that the O-ring seal 1 8 can be omitted if the injection pump is not fitted directly into an engine in the manner illustrated and is fitted in a bottom portion (not illustrated) of the housing and the said bottom portion is connected to a fuel return-flow line.
Claims (15)
1. A fuel injection pump comprising pump units each having a pump piston with an oblique control edge and a pump cylinder rotatably disposed in a bore in the housing of the injection pump, and at least one device for individually pre-adjusting the delivery quantities of the pump units, which device comprises a recess incorporated in the periphery of the pump cylinder, an adjusting element having a cylindrical shank which is aligned at right angles to the pump cylinder and is rotatably disposed in a bore in the pump housing, and a pin which is formed eccentrically on the shank and engages the recess in the pump cylinder for the purpose of adjusting the pump cylinder by rotation of the adjusting element and a retaining element for securing the adjusting pin in position, at least one further recess being provided in the housing of the pump directly contiguously to the respective bore therein so that the adjusting element extends into the said second recess, and the retaining element being pressed into the second recess between the housing and the adjusting element.
2. A fuel injection pump as claimed in claim 1, in which the retaining element is made from a material whose yield point is lower than that of the materials of the adjusting element and of the housing.
3. A fuel injection pump as claimed in claim 1 or 2, in which the retaining element is made from metal, such as aluminium.
4. A fuel injection pump as claimed in claim 1, 2 or 3, in which the retaining element is of substantially disc-like shape and has an edge region which is substantially adapted to the cross section of the adjusting element and a further edge region which is located opposite to the aforesaid edge region and which is substantially adapted to the cross section of the second recess.
5. A fuel injection pump as claimed in claim 4, in which the disc-like retaining element is dished when in its initial state.
6. A fuel injection pump as claimed in claim 4 or 5, in which the second recess is of cylindrical configuration.
7. A fuel injection pump as claimed in claim 6, in which the recess is disposed eccentrically of the bore which receives the adjusting element, and the retaining element has a substantially crescentshaped configuration.
8. A fuel injection pump as claimed in any of claims 1 to 7, in which the adjusting element has a rough circumferential surface in the region which lies adjacent to the second recess when viewed in the axial direction of the adjusting element.
9. A fuel injection pump as claimed in any of claims 1 to 7, in which the adjusting element has a polygonal cross section in the region which lies adjacent to the second recess when viewed in the axial direction of the adjusting element.
10. A fuel injection pump as claimed in claim 9, in which the polygonal cross section is a regular hexagonal cross section.
11. A fuel injection pump as claimed in any of claims 1 to 10, in which the second recess has a bottom whose surface extends substantially transversely of the bore and forms a stop for the retaining element.
12. A fuel injection pump as claimed in claim 11 when appendant to claim 8, 9 or 10, in which that end of the adjusting element which extends into the second recess is in the form of a head and projects beyond the diameter of the bore so as to abut against the bottom of the recess in the housing.
13. A fuel injection pump as claimed in claim 12, in which a pilot is formed on the head of the retaining element to facilitate insertion and pressing in of the retaining element around the head of the retaining element.
14. A fuel injection pump as claimed in claim 13, in which the thickness of the retaining element is chosen to be greater than the height of the head of the retaining element.
15. A fuel injection pump having a delivery quantity adjusting device constructed substantially as herein described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803048205 DE3048205A1 (en) | 1980-12-20 | 1980-12-20 | DEVICE FOR ADJUSTING THE FLOW RATE OF THE PUMP ELEMENTS OF FUEL INJECTION PUMPS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2089903A true GB2089903A (en) | 1982-06-30 |
| GB2089903B GB2089903B (en) | 1984-05-23 |
Family
ID=6119763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8137701A Expired GB2089903B (en) | 1980-12-20 | 1981-12-15 | Device for adjustment of the quantities of fuel delivered by the pump units of a fuel injection pump |
Country Status (5)
| Country | Link |
|---|---|
| JP (2) | JPS57129252A (en) |
| DE (1) | DE3048205A1 (en) |
| GB (1) | GB2089903B (en) |
| IN (1) | IN154194B (en) |
| IT (1) | IT1142133B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD1011181S1 (en) * | 2020-11-09 | 2024-01-16 | Saris Equipment, Llc | Nut and tool set |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0181402B1 (en) * | 1984-05-08 | 1990-05-30 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Fuel injection pump |
| DE3546930C2 (en) * | 1984-05-08 | 2003-10-30 | Bosch Automotive Systems Corp | Fuel injection pump |
| JPH0322549Y2 (en) * | 1985-11-28 | 1991-05-16 | ||
| JP5942962B2 (en) * | 2013-11-12 | 2016-06-29 | 株式会社デンソー | High pressure pump |
-
1980
- 1980-12-20 DE DE19803048205 patent/DE3048205A1/en not_active Withdrawn
-
1981
- 1981-11-26 IN IN1332/CAL/81A patent/IN154194B/en unknown
- 1981-12-15 GB GB8137701A patent/GB2089903B/en not_active Expired
- 1981-12-18 JP JP56203816A patent/JPS57129252A/en active Pending
- 1981-12-18 IT IT25682/81A patent/IT1142133B/en active
-
1991
- 1991-03-04 JP JP1991010956U patent/JPH0531262Y2/ja not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD1011181S1 (en) * | 2020-11-09 | 2024-01-16 | Saris Equipment, Llc | Nut and tool set |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0489856U (en) | 1992-08-05 |
| IT8125682A0 (en) | 1981-12-18 |
| JPS57129252A (en) | 1982-08-11 |
| JPH0531262Y2 (en) | 1993-08-11 |
| DE3048205A1 (en) | 1982-07-29 |
| IT1142133B (en) | 1986-10-08 |
| GB2089903B (en) | 1984-05-23 |
| IN154194B (en) | 1984-09-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |