GB1587794A - Fuel injection pumps for internal combustion engines - Google Patents
Fuel injection pumps for internal combustion engines Download PDFInfo
- Publication number
- GB1587794A GB1587794A GB18180/78A GB1818078A GB1587794A GB 1587794 A GB1587794 A GB 1587794A GB 18180/78 A GB18180/78 A GB 18180/78A GB 1818078 A GB1818078 A GB 1818078A GB 1587794 A GB1587794 A GB 1587794A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bore
- pump
- delivery
- piston
- sleeve
- 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
Links
- 238000002347 injection Methods 0.000 title claims description 37
- 239000007924 injection Substances 0.000 title claims description 37
- 239000000446 fuel Substances 0.000 title claims description 15
- 238000002485 combustion reaction Methods 0.000 title claims description 5
- 230000001154 acute effect Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910000760 Hardened steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 210000002445 nipple Anatomy 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
- F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing
-
- 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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
(54) FUEL INJECTION PUMPS FOR INTERNAL COMBUSTION ENGINES
(71) We, ROBERT BOSCH GmbH, a
German company of Postfach 50, 7 Stuttgart 1, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to fuel injection pumps.
In a known fuel injection pump, in order to measure the pre-stroke, that is the travel of the pump piston from its bottom dead centre position until it closes the control bore and the delivery stroke commences, the pressure valve fitted in the extension of the cylinder which receives the piston, and the associated pipe connection, have to be removed in order to be able to apply the feeler pin of a prestroke measuring device to the end face of the pump piston. This method is necessary particularly when the associated pump housing does not allow the measurement to be made by applying a measuring device to the pump piston drive. Similar considerations obtain when the pump is made as a plug-in construction which is plugged into the engine housing.
The present invention provides a fuel injection pump for an internal combustion engine, having a pump piston which is axially and rotatably movably guided in a cylindrical sleeve and, for the purpose of varying the delivery quantity, is provided with an oblique control edge which cooperates with at least one control bore in the wall of the cylindrical sleeve, and a pressure valve which is fitted into the connection between the pump working chamber and the injection nozzle and whose valve body is clamped by means Qf a pipe connection, serving for connection of the pressure line leading to the injection nozzle, against a shoulder of a widened portion of a delivery bore connecting the pump working chamber to the pressure line, wherein the bore portion receiving the valve body of the pressure valve is disposed in a second portion of the delivery bore which branches laterally, from a first portion of the said delivery bore and which extends coaxially of the longitudinal axis of the cylindrical sleeve, and wherein a screw plug, removable for measuring the prestroke, is screwed into an extension of the first portion of the delivery bore.
By removing the screw plug screwed into the extension of the first portion of the delivery bore, the fuel injection pump in accordance with the invention, renders it possible to obtain simple access for the feeler pin of a pre-stroke measuring device without having to remove any important parts such as the pipe connection and the pressure valve of the injection pump. Furthermore, a very small overall height of the injection pump ensues when the second portion of the delivery bore branches at right angles to the longitudinal axis of the cylindrical sleeve.
This may be advantageous in the case of cramped conditions on the engine.
In an injection pump in which the part of the injection pump which accommodates the pressure valve, the pipe connection and the delivery bore, is combined with the cylindrical sleeve to form a flanged sleeve, the components can be arranged in a manner which facilitates manufacture and which, nevertheless, reduces the dead space, when the first portion of the delivery bore extends within a filling piece inserted into the widened bore portion, wherein a cylindrical portion of the screw plug advantageously acts as a filling piece.
A preferred arrangement of all the components, which enables the injection pump to be constructed in a compact manner, ensues when the two portions of the delivery bore together with the screw plug, pressure valve and pipe connection are arranged within a flange-shaped pump housing accommodating the suction chamber of the pump, and when the cylinder liner is inserted into the pump housing from the drive side and is clamped by means of an annular screw against a shoulder of a widened bore portion in the first portion of the delivery bore.
Pumps of this type are fitted as plug-in pumps into the engine housing. By virtue of the arrangement, in accordance with the invention, of the screw plug in line with the axis of the pump piston, it is particularly advantageous in pumps of this type when only the screw plug has to be removed in order to measure the pre-stroke, the pressure valve being left in its fitted state.
The present invention is further described hereinafter, by way of example, with reference to the accompanying drawings, in which:
Figure 1 shows the first embodiment of a fuel injection pump in the form of a plug-in pump; and
Figure 2 shows the second embodiment of an in-line injection pump provided with a flanged sleeve.
Figure 1 shows the first embodiment of a fuel injection pump which is in the form of a plug-in pump and whose pump housing 10 is fitted into a bore 11 in the engine housing 12 indicated by dash-dot lines. A plug-in pump of this type is driven in a known manner by means of a roller shaft (not illustrated) which is fitted in the engine housing and which is in turn driven by a camshaft of the engine. A cylindrical sleeve 14 for guiding an axially and rotatably movable pump piston 13 has a top portion 15 of larger diameter inserted from the drive side into a reception bore 17 of the pump housing 11. An annular screw 16 screwed into the housing 12 secures the sleeve in position, the cylindrical sleeve thereby being clamped against a shoulder 21 at the end of the reception bore 17 and a pressure shoulder 19 of the annular screw 16.
The pressure shoulder 19 is formed by a widened bore portion 22 which is machined into the annular screw 16 from that end face 18 thereof disposed in a suction chamber 23.
A widened annular-chamber-like portion of the reception bore 17 constitutes the suction chamber 23 and is connected to a feed pump (not illustrated) by way of a bore 24, or directly to the fuel tank which, if required, may be located at a higher level.
The suction chamber 23 surrounds the top portion 15 of the cylindrical sleeve 14 in the region of a control bore 26 which is incorporated in the wall of the cylindrical portion 15 and which at the same time serves to feed and discharge the fuel to and from a pump working chamber 25. The pump piston 13 is rotatable, for the purpose of varying the delivery quantity, by means of a regulating lever 27 and a regulating sleeve 28 connected to the regulating lever 27, and is provided with an oblique control edge 29 which cooperates with the control bore 26 in a known manner.
In order to prevent destruction of the inner wall of the suction chamber 23 upon the termination of delivery by the fuel jet emerging with high energy from the pump working chamber 25 through the control bore 26, the end of the annular screw 16 which faces the suction chamber 23 is provided with an annular extension 31 which surrounds the top portion 15 of the cylindrical sleeve 14 in the region of the control bore 26. The distance between the annular extension 31 and the outer surface of the top portion 15 of the cylindrical sleeve 14 is such that the flow of fuel between the suction chamber 23 and the pump working chamber 25 is not obstructed, although the inner wall 32 of the extension 31 forms a baffle for protection against the jet of fuel emerging from the control bore 26 upon the termination of delivery.The inner wall 32 is made from hardened steel or, alternatively, can be in the form of an inserted hardened steel ring in the case of very large pumps. In order to be able to screw in the annular screw 16 in a satisfactory manner, the end of the annular screw at the drive side is provided with an internal profile 33 which is adjacent to the pressure shoulder 19 and which is in the form of an hexagonal recess, and a sealing ring 34 is fitted into an annular groove 35 to ensure external sealing of the suction chamber 23.
A first portion 36a of a delivery bore 36 is incorporated in the pump housing 10 in line with the cylindrical bore 14a of the cylindrical sleeve 14, and a second portion 36b of the delivery bore 36 branches at right angles from the first portion 36a and accommodates a pressure valve 37 in the form of a pressure relief valve. A pipe connection 38 in the form of a screw nipple serves to connect the pressure line leading to the injection nozzle to the pump and also clamps a valve body 37a of the pressure valve 37 against a shoulder 40a of a widened portion 40 of the second portion 36b of the delivery bore 36. A screw plug 39 for closing the delivery bore 36 is screwed in a pressure-tight manner into an extension 36c, of larger diameter, of the first portion 36a of the delivery bore 36, the screw plug 39 being removable for the purpose of measuring the pre-stroke of the pump piston 13. This arrangement of the screw plug 39 shown in Figure 1 permits direct access to the pump piston 13 by means of a measuring device without having to remove the pressure valve 37, since, advantageously, the pressure valve is fitted in the second portion 36b of the delivery bore 37 which is arranged at right angles to the first portion 36a.
The second embodiment illustrated in
Figure 2 constitutes a cross section through an in-line injection pump in the region of one of its pump elements. Parts which are the same as those of the first embodiment described with reference to Figure 1 are provided with the same reference numerals, and parts which are modified with respect to their function and construction are provided with an index mark.
A flange-shaped member 41 of the injection pump accommodates the pressure valve 37, the pipe connection 38 and the delivery bore 36' and is combined with the cylindrical sleeve 14' accommodating the pump piston 13 to form a flanged sleeve 42. The cylindrical sleeve 14' of the flange sleeve 42 is inserted into the reception bore 17' of the pump housing 10' from an end face 43 ofthe pump housing 10' which is remote from the drive of the pump piston 13. Washers 45 of differing thicknesses for adjusting the prestroke of the pump piston 13 can be interposed between the end face 43 of the pump housing 10' and the flange 41 of the flange sleeve 42. This pre-stroke is designated a' in
Figure 2 and, when the piston 13 is in its bottom dead centre position, constitutes the distance between the top end face 46 of the piston 13 and the top edge of the control bore 26.A widened portion 36c' of a delivery bore 36' leading away from the pump working chamber is disposed in line with the cylindrical bore 14a' receiving the pump piston 13, and the end of the bore portion 36' which faces the pump piston 13 forms a portion -of the pump working chamber 25, and its end remote from the pump piston 13 receives a screw plug 39' provided with a cylindrical portion 48 which acts as a filling piece and which is inserted into the widened bore portion 36c' to an extent where it fills the greater part of the bore portion 36c' and its end face 49 facing the pump piston 13 defines the pump working chamber 25 at the delivery end.A first portion 36a' of the delivery bore 36' is incorporated as a blind bore in the filling piece 48 and communicates with a second portion 36b' of the delivery bore 36' by way of a transverse bore 51 and an annular groove 52. In the same manner as in the first embodiment, the valve body 37a of the pressure valve 37 is clamped by the pipe connection 38 against the shoulder 40a of the widened bore portion 40 of the second portion 36b' of the delivery bore 36'.
The screw plug 39' can be removed for the purpose of measuring the pre-stroke, and the end face 46 of the pump piston 13 is accessible for the purpose of sensing by means of a feeler pin of the pre-stroke measuring device.
A small overall height of the pump is rendered possible by the horizontal arrangement of the pipe connection 38 and the portion 36b and 36b' respectively of the delivery bores 36 and 36' shown in the two embodiments of Figures 1 and 2. If a small overall height of the pump is not essential, the pipe connection 38 may be fitted into the pump housing or the flanged sleeve parallel to, and offset relative to, the longitudinal axis of the pump piston.The accessibility, in accordance with the invention, of the pump piston 13 for the purpose of measuring the pre-stroke after removing the screw plug 39 or 39' can also be obtained when the portion 36b, 36b' of the delivery bore 36, 36' branches from the first portion 36a, 36a' at an acute angle, and the pipe connection 38 and the pressure valve 37 are fitted in a bore (not illustrated) which extends parallel to the cylindrical bore 14a, 14a' and which is offset laterally relative thereto.
WHAT WE CLAIM IS:
1. A fuel injection pump for an internal combustion engine, having a pump piston which is axially and rotatably movably guided in a cylindrical sleeve and, for the purpose of varying the delivery quantity, is provided with an oblique control edge which co-operates with at least one control bore in the wall of the cylindrical sleeve, and a pressure valve which is fitted into the connection between the pump working chamber and the injection nozzle and whose valve body is clamped by means of a pipe connection, serving for connection of the pressure line leading to the injection nozzle, against a shoulder of a widened portion of a delivery bore connecting the pump working chamber to the pressure line, wherein the bore portion receiving the valve body of the pressure valve is disposed in a second portion of the delivery bore which branches laterally from a first portion of the delivery bore and which extends coaxially of the longitudinal axis of the cylindrical sleeve, and wherein a screw plug, removable for measuring the prestroke, is screwed into an extension of the first portion of the delivery bore.
2. An injection pump as claimed in claim 1 in which a flange-shaped member accommodating the pressure valve, the pipe connection and the delivery bore, is combined with the cylindrical sleeve to form a flanged sleeve, and wherein the first portion of the delivery bore extends within a filling piece fitted into the widened bore portion.
3. An injection pump as claimed in claim 2, wherein a cylindrical portion of the screw plug acts as the filling piece.
4. An injection pump as claimed in claim 2 or 3, wherein the delivery end of the pump working chamber is defined by an end face of the filling piece which faces the pump piston.
5. An injection pump as claimed in any of claims 2 to 4, wherein the first portion of the delivery bore is incorporated in the form of a blind bore in the filling piece and is connected to the second portion of the delivery bore by way of a transverse bore and an annular groove.
6. An injection pump as claimed in claim 1, wherein the two portions of the delivery bore, together with the screw plug, the pressure valve and the pipe connection, are arranged within a preferably flange-shaped pump housing, and that the cylindrical sleeve is inserted into a reception bore in the pump housing from the drive side and is clamped by means of an annular screw against a
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
1. A fuel injection pump for an internal combustion engine, having a pump piston which is axially and rotatably movably guided in a cylindrical sleeve and, for the purpose of varying the delivery quantity, is provided with an oblique control edge which co-operates with at least one control bore in the wall of the cylindrical sleeve, and a pressure valve which is fitted into the connection between the pump working chamber and the injection nozzle and whose valve body is clamped by means of a pipe connection, serving for connection of the pressure line leading to the injection nozzle, against a shoulder of a widened portion of a delivery bore connecting the pump working chamber to the pressure line, wherein the bore portion receiving the valve body of the pressure valve is disposed in a second portion of the delivery bore which branches laterally from a first portion of the delivery bore and which extends coaxially of the longitudinal axis of the cylindrical sleeve, and wherein a screw plug, removable for measuring the prestroke, is screwed into an extension of the first portion of the delivery bore.
2. An injection pump as claimed in claim 1 in which a flange-shaped member accommodating the pressure valve, the pipe connection and the delivery bore, is combined with the cylindrical sleeve to form a flanged sleeve, and wherein the first portion of the delivery bore extends within a filling piece fitted into the widened bore portion.
3. An injection pump as claimed in claim 2, wherein a cylindrical portion of the screw plug acts as the filling piece.
4. An injection pump as claimed in claim 2 or 3, wherein the delivery end of the pump working chamber is defined by an end face of the filling piece which faces the pump piston.
5. An injection pump as claimed in any of claims 2 to 4, wherein the first portion of the delivery bore is incorporated in the form of a blind bore in the filling piece and is connected to the second portion of the delivery bore by way of a transverse bore and an annular groove.
6. An injection pump as claimed in claim 1, wherein the two portions of the delivery bore, together with the screw plug, the pressure valve and the pipe connection, are arranged within a preferably flange-shaped pump housing, and that the cylindrical sleeve is inserted into a reception bore in the pump housing from the drive side and is clamped by means of an annular screw against a
shoulder of the reception bore to which is contiguous the first portion of the delivery bore which has an extension accommodating the screw plug.
7. An injection pump as claimed in any of claims 1 to 6 wherein said second portion of the delivery bore branches at right angles from said first portion thereof.
8. A fuel injection pump substantially as hereinbefore described with reference to Fig.
I or 2 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782806477 DE2806477A1 (en) | 1978-02-16 | 1978-02-16 | FUEL INJECTION PUMP FOR COMBUSTION ENGINE, IN PARTICULAR FOR DIESEL ENGINES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1587794A true GB1587794A (en) | 1981-04-08 |
Family
ID=6032077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18180/78A Expired GB1587794A (en) | 1978-02-16 | 1978-05-08 | Fuel injection pumps for internal combustion engines |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS54117823A (en) |
| DE (1) | DE2806477A1 (en) |
| GB (1) | GB1587794A (en) |
| IT (1) | IT1110615B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016133058A (en) * | 2015-01-20 | 2016-07-25 | 株式会社デンソー | High pressure pump and method for manufacturing the same |
-
1978
- 1978-02-16 DE DE19782806477 patent/DE2806477A1/en not_active Ceased
- 1978-05-08 GB GB18180/78A patent/GB1587794A/en not_active Expired
-
1979
- 1979-02-09 IT IT20056/79A patent/IT1110615B/en active
- 1979-02-14 JP JP1513279A patent/JPS54117823A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| IT1110615B (en) | 1985-12-23 |
| DE2806477A1 (en) | 1979-08-23 |
| JPS54117823A (en) | 1979-09-12 |
| IT7920056A0 (en) | 1979-02-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930508 |