US3804559A - Support and guide means for the fuel rack contained in a fuel injection pump - Google Patents

Support and guide means for the fuel rack contained in a fuel injection pump Download PDF

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Publication number
US3804559A
US3804559A US00291181A US29118172A US3804559A US 3804559 A US3804559 A US 3804559A US 00291181 A US00291181 A US 00291181A US 29118172 A US29118172 A US 29118172A US 3804559 A US3804559 A US 3804559A
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United States
Prior art keywords
fuel rack
guide rail
pump housing
pump
guide
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
Application number
US00291181A
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English (en)
Inventor
H Staudt
E Hofmann
P Knorreck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE19712149362 external-priority patent/DE2149362C3/de
Priority claimed from DE19722234197 external-priority patent/DE2234197C3/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3804559A publication Critical patent/US3804559A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • F02M59/28—Mechanisms therefor
    • 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/13—Special devices for making an explosive mixture; Fuel pumps
    • F02M2700/1317—Fuel pumpo for internal combustion engines
    • F02M2700/1388—Fuel pump with control of the piston relative to a fixed cylinder

Definitions

  • This invention relates to a fuel injection pumpfor internal combustion engines and is particularly concerned with a multicylinder serial pump which includes cylinder sleeves inserted into the pump housing and a pump piston reciprocating in each cylinder sleeve.
  • Each pump piston is adapted to be angularly adjusted for varying the effective delivery stroke by means of a longitudinally shiftable fuel rack which is supported in the pump housing parallel to the longitudinal axis of the pump.
  • the fuel rack projectsoutwardly from one side of the pump housing to be connected with a fuel quantity regulator.
  • the fuel rack supported in the aforeoutlined known manner has to be sufficiently rigid so that a buckling thereof will notoccur in case of rapid changesin the load.
  • Such a design of the fuel rack has the disadvantage that its weight is significant and thus, its inertia adversely affects the fuel regulation.
  • at least one additional intermediate support has to be provided, the mounting of which, however, is difficult and in case of laterally closed pump housings, cannot be effected at all.
  • the fuel rack is supported in a guide rail whichextends over the entire length of the pump housing and which has an inner wall configuration that is complemental to the cross-sectional outline of the fuel rack.
  • the guide rail surrounds the fuel rack at least. at three normally adjoining sides, while its side oriented towards the pump piston is open.
  • a guide rail according to the invention results in a support which is insensitive to wear and loads and which makes it possible to provide a fuel rack of extremely light weight.
  • FIG. 1 is a cross-sectional view on an enlarged scale 2 of the first embodiment of the invention taken along line I-l of FIG. 2;
  • FIG. 2 is a side elevational view of the first embodiment shown partially in section taken along line .lI-II of FIG. 1;
  • FIG. 3 is a perspective view of a guide rail according to the first embodiment
  • FIG. 4 is a perspective view of afuel rack used with the first embodiment
  • FIG. 5 is a view of two further components in the direction of arrow A in FIG. 2;
  • FIG. 6 is a sectional view of a structural group taken along line VI-Vl of FIG. 2;
  • FIG. 7 is a view similar to FIG. 6 illustrating a structural group of a second embodiment of the invention.
  • FIGS; 1 and 2 inan only partially shown pump housing 10 of a multicylinder serial injection pump there are provided a plurality of parallel spaced mounting bores 11.
  • a cylinder sleeve 12 in the cylinder bore 13 of which there is disposed a slidable pump piston 15 provided with an oblique control edge 14.
  • Each pump piston 15 is, in a known manner, angularlyadjustable by means of a longitudinally shiftable fuel rack 16 for altering the effective delivery stroke.
  • the terminus 16a of the fuel rack 16 projects outwardly from the end face 10a of the pump housing 10 to be connected ina known manner with a regulator, not shown.
  • the other terminus 16b of the fuel rack 16 which is adjacent the pump drive means (not shown) is supported within the pump housing 10 and does not project, at any time, beyond the end face 10b of the pump housing; 10;
  • the fuel rack 16 (see also FIG. 4) is a stamped sheet metal component which has a substantially rectangular cross section and from which, in the zone of the pump piston 15 there project, normal to the axis of the pump piston, bent coupling tabs 17, each having a slot-like opening 18 oriented toward the associated pump piston 15. Into the opening 18 there extends, as a force transmitting member, asphere 21 which is soldered to a connecting arm 19 attached to the pump piston 15.
  • the connecting arm 19 forms part of a regulator sleeve 22 which is rotatably guided on a lower bearing surface 23 of the cylinder sleeve 2 and which is axially immobilized between a shoulder 24 of the housing 10 and a spring seat disc 25.
  • the spring seat disc 25 which is supported by a shoulder 26 of the housing 10, is engaged by one end of a tappet spring 27 which, with'its other end, engages a tappet in a known manner (not illustrated).
  • the tap pet in turn, is driven by a cam shift in a known manner, also not illustrated, and, as a result, :a reciprocating motion is imparted to the pump piston 15.
  • the fuel rack 16 is supported in a guide rail 31 (see also FIG. 3) which is inserted into a longitudinal bore 29 of the pump housing 10.
  • the guide rail 31 extends over the entire length L of the pump housing10 and has a U-shaped cross section 32. It surrounds the fuel rack 16 at three normally adjoining sides; the fourth side of the guide rail oriented towards the pump piston 15 is open with the exception of two inwardly bent guide flaps 33 which surround the terminus 16b of the fuel rack 16 in a jaw-like manner and thus prevent the fuel rack 16 from deflecting in the direction of the pump piston 15.
  • the guide flaps 33 are, as viewed from the driven side of the pump, disposed between the two first pump elements formed of the cylinder sleeve 12 and the pump piston 15.
  • the first support guide 35 which is tightened against the end face 10a of the pump housing 10, or, more precisely, against a slightly recessed surface within said end face, by means of two bolts 37, is formed of two substantially identical support plates 38, 39 (see also FIG.
  • the first plate 38 has a throughgoing opening 41 which snugly surrounds one terminus 31a of the guide rail 31.
  • the terminus 31a (see also FIG. 3) of the guide rail 31 has three rectangularly outwardly bent flange-shaped portions 42 and 42a which, for the purpose of axial immobilization of the guide rail 31, are tightened by means of the second support plate 39 against an outwardly projecting edge face 43 of the first support plate 38.
  • the second support plate 39 has a throughgoing opening 44 which corresponds to the rectangular cross section of the fuel rack 16 and which is offset at such a distance a (see FIGS. 2 and 5) that a portion 45 of the plate 39 projects into a cutout 46 of the fuel rack 16 and serves as an abutment.
  • the second support plate 39 may be shifted by the distance a above the terminus 16a of the fuel rack 16.
  • the portion 45 projects into the cutout 46 and serves as an abutment for limiting the maximum displacement of the fuel rack 16.
  • the second support guide (FIG. 2) is constituted by a deep drawn sheet metal cap 36 which is inserted with its cylindrical edge portion 47 in the zone of the end face b of the pump housing 10 and into the longitudinal bore 29 in a fluid tight manner.
  • the second support guide 36 receives the terminus 31b of the guide rail 31 I in a pocket-shaped depression 48 of rectangular configuration with such a clearance that the guide rail 31 may be inserted from the side of the end face 100 with ease and after assembly it is secured against rotation and held in its inserted position.
  • the outermost end 36a of the sheet metal cap 36 does not project beyond the outermost axial portion of the pump housing 10. In the shown embodiment this outermost'axial portion is the end face 10b with the mounting flange 51 which, as known, form a contiguous surface.
  • The. end face 10b of the housing 10, as illustrated with dash-dot lines 10b in FIG. 2, may be setback with respect to the mounting flange 51; in this manner material may be saved in the manufacture.
  • the receded sheet metal cap 36 is of substantial advantage, since it is not necessary to provide openings or depressions (which often have to be rendered fluid tight) for the fuel rack closure cap or to provide a longitudinally ex tended flange as it has been conventionally required.
  • the terminus 16a of the fuel rack 16 has to be only of such a length that it is adapted to carry the actuating tab 17 associated with the first pump elements l2, 15 as seen from the driven side of the pump. Without the guide rail 31 (which along its entire length serves as a bearing), the fuel rack 16 should be extended to such a tension spring having a small outer diameter and is,
  • the play compensating spring 61 serves to move the fuel rack 16 towards and maintain it in the arrested position, that is, in the present case, adjacent its terminus 16a with a slight spring force which does not affect the regulation.
  • the play compensating spring 61 is suspended at two support points: one spring terminus 61a is hooked to a pin 62 affixed to the fuel rack 16 and its other terminus 61b is hooked to a component 63 affixed to the web 34 of the guide rail 31.
  • the part 63 is formed as a hook-like extension or sheet metal ear of the base 34 of the guide rail 31.
  • the component connected with the web or base 34 of the guide rail 31' is formed as a flangeshaped extension 42a provided with an opening 64 into which the spring terminus 61b may be hooked.
  • the aforedescribed arrangement results in an inexpensive, preassembled, easily insertable and removable structural group in which the tension spring 61 may be of soft structure. It is noted that play compensating springs which in conventional fuel rack guide means are arranged about that terminus of the fuel rack which is adjacent the regulator, cannot have an arbitrarily soft structure because of their given inner diameter. Furthermore, since these conventional springs are compression springs, they may buckle and then obstruct regulation.
  • the pin 62 connected with the fuel rack 16 by means of a snap ring 65 extends through a slot 66 in the web 34 of the guide rail 31 and is provided with an annular groove 67 into which there is hooked the terminus 61a of the play compensating spring 61, so that the latter is disposed in the intermediate space between the wall of the longitudinal bore 29 of the housing 10 and the external side of the web 34 of the guide rail 31 without being in contact with either of these parts.
  • the fuel rack guiding means according to the invention has, when combined with the aforedescribed regulating mechanism which is characterized essentially by the actuating arm 19 coupled to the pump piston 15, the additional advantage that it is largely insensitive to tolerances and clearances which in the mass production of these components is a particularly economical feature.
  • a support and guide means for a fuel rack contained in a multicylinder serial fuel injection pump being of known type that has (a) a pump housing having two end faces spaced at a distance that defines a length dimension of said pump housing, (b) a plurality of cylinder sleeves inserted in said pump housing along the length dimensionthereof, (c) a pump piston positioned in each said cylinder sleeve, (d) a longitudinal bore provided in said pump housing for receiving said fuel rack (e) means connecting said fuel rack with each pump piston for altering its angular position in its cylinder sleeve upon longitudinal displacement of said fuel rack for changing effective delivery stroke of each pump piston, (f) a terminus forming a part of said fuel rack and projecting from one of said end faces of said pump housing, the improvement comprising,
  • said guide rail has a U-shaped section and said fuel rack, at least inthe zone of said guide rail, has a substantially rectangular configuration
  • said guide rail has at least one pair of oppositely inwardly bent guide flaps extending at least partially across said open side oriented towards said pump pistons, and
  • said fuel. rack has angularly bent coupling tabs, one associated with each pump piston, each coupling tab having an opening into which extends a connecting arm, said coupling tabs and said connecting arms forming part of said means connecting said fuel rack with each pump piston.
  • said first rail support guide includes means for axially andradially immobilizing oneend of said guide rail and one coupled to each pump pissaid second railsupport guide includes means for preventing the other end 'of said guide displacement.
  • first rail-support guide is formed of a first and a second support plate, said first support plate having an aperture closely surrounding one end portion of said guide rail, said last-named end portion projecting through said aperture and having outwardly bent flange-shaped portions clamped between said first and second support plates for an axial immobilization of said guide rail.
  • said second support plate has an aperture of a shape corresponding to the cross section of said fuel rack, said fuel rack extending through said last-named aperture and having-a cutout portion along its zone cooperating with the last-named aperture, a portion of said second support plate bounding said last-named aperture projects into said cutout to constitute an abutment determining an extreme position of said fuel rack.
  • said second rail support guide is formed of a cap-like component having a cylindrical edge portion fitted fluid tight into said longitudinal bore adjacent one end face of said pump housing, said cap-like component further having a pocket-shaped depression receiving one terminus of said fuel rack and constituting said means for preventing rotational displacement thereof.
  • a support and guide m'eans fora fuel rack contained in a multicylinder serial fuel injection pump being of known type that has (a) a pump housing having two end faces spaced at a distance that defines a length dimension of said pump housing, (b) a plurality of cylinder sleeves inserted in said pump housing along the length dimension thereof, (c) a pump piston positioned in each said cylinder sleeve, (d) a longitudinal bore provided in said pump housing for receiving said fuel rack (e) means connecting said fuel rack with each pump piston for altering its angular position in its cylinder sleeve upon longitudinal displacement of said fuel rack for changing effective delivery stroke of each pump piston, .(f) a terminus forming a part of said fuel rack and projecting from one of said end faces of said pump housing, the improvement comprising,
  • said first rail support guide includes means for axially and radially immobilizing one end of said guide rail, said means being formed of a first and a second support plate, said first support plate having an aperture closely surrounding one end portion of said guide rail, said last-named endportion projecting through said aperture and having outwardly bent flange-shaped portions clamped between said first and second support plates for axial immobilization of said guide rail, and
  • said second rail support guide includes means for preventing the other end of said guide rail from rotational displacement.
  • said second support plate has an aperture of a shape corresponding to the cross section of said fuel rack, said fuel rack extending through said last-named aperture and having a cutout portion along its zone cooper ating with the last-named aperture, a portion of said second support plate bounding said last-named aperture projects into said cutout to constitute an abutment determining an extreme position of said fuel rack.
  • a support and guide means for a fuel rack contained in a multicylinder serial fuel injection pump being of known type that has (a) a pump housing having two end faces spaced at a distance that defines a length dimension of said pump housing, (b) a plurality of cylinder sleeves inserted in said pump housing along the length dimension thereof, (c) a pump piston positioned in each said cylinder sleeve, (d) a longitudinal bore provided in said pump housing for receiving said fuel rack, (e) means connecting said fuel rack with each pump piston for altering its angular position in its cylinder sleeve upon longitudinal displacement of said fuel rack for changing effective delivery stroke of each pump piston, (f) a terminus forming a part of said fuel rack and projecting from said pump housing, the improvement comprising, 1
  • said fuel rack has another terminus remaining entirely within said guide rail in any operational position of said'fuel rack
  • a support and guide means for a fuel rack contained in a multicylinder serial fuel injection pump being of known type that has (a) a pump housing having two end faces spaced at a distance that defines a length dimension of said pump housing, (b) a plurality of cylinder sleeves inserted in said pump housing along the length dimension thereof, (0) a pump piston positioned in each said cylinder sleeve, (d) a longitudinal bore provided in said pump housing for receiving said fuel rack, (e) means connecting said fuel rack with each pump piston for altering its angular position in its cylinder sleeve upon longitudinal displacement of said fuel rack for changing effective delivery stroke of each pump piston, (f) a terminus forming a part of said fuel rack and projecting from said pump housing, the improvement comprising,
  • said guide rail has a U-shaped section with at least one pair of oppositely inwardly bent guide flaps extending at least partially across said open side oriented toward said pump pistons, said guide flap being located at least in the zone of that terminus of said fuel rack that is remote from the terminus that projects outwardly from said pump-housing, and wherein said fuel rack, at least in the zone of said guiderail, has a substantially rectangular configuration.
  • a support and guide means for a fuel'rack contained in a multicylinder serial fuel injection pump being of known type that has (a) a pump housing having two end faces spaced at a distance that defines a length dimension of said pump housing, (b) a plurality of cylinder sleeves inserted in said pump housing along the length dimension thereof, (c) a pump piston positioned in each said cylinder sleeve, (d) a longitudinal bore provided in said pump housing for receiving said fuel rack, (e) means connecting said fuel rack with each pump piston for altering its angular position in its cylinder sleeve upon longitudinal displacement of said fuel rack for changing effective delivery stroke of each pump position, (f) a terminus forming a part of said fuel rack and projecting from said pump housing, the improvement comprising,
  • said guide rail has a U-shaped section including a base forming part of said guide rail, a longitudinally extending slot provided in said base, a component affixed to said base, a pin affixed to said said component is formed of an eyelet bent outwardly from said base in a hook-like manner.
  • said guide rail having outwardly bent flange-shaped portions clamped in said first rail support guide, one of said flange-shaped portions constitutes said component, said last-named flange-shaped portion is provided with an opening into which one end of said tension spring is hooked.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)
US00291181A 1971-10-02 1972-09-22 Support and guide means for the fuel rack contained in a fuel injection pump Expired - Lifetime US3804559A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19712149362 DE2149362C3 (de) 1971-10-02 Kraftstoffeinspritzpumpe für Brennkraftmaschinen
DE19722234197 DE2234197C3 (de) 1972-07-12 1972-07-12 Kraftstoffeinspritzpumpe für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3804559A true US3804559A (en) 1974-04-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00291181A Expired - Lifetime US3804559A (en) 1971-10-02 1972-09-22 Support and guide means for the fuel rack contained in a fuel injection pump

Country Status (12)

Country Link
US (1) US3804559A (enExample)
JP (1) JPS545057B2 (enExample)
AT (1) AT313649B (enExample)
BE (1) BE789559A (enExample)
CS (1) CS158748B2 (enExample)
ES (1) ES407184A1 (enExample)
FR (1) FR2155298A5 (enExample)
GB (1) GB1346009A (enExample)
IT (1) IT968521B (enExample)
PL (1) PL82144B1 (enExample)
RO (1) RO60608A (enExample)
SU (1) SU822768A3 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945773A (en) * 1973-09-05 1976-03-23 Sigma Diesel Hydraulic heads for injection pumps and the injection pumps themselves
US3985474A (en) * 1973-09-12 1976-10-12 Sigma Diesel Hydraulic heads for injection pumps and the injection pumps themselves
US4208998A (en) * 1976-10-15 1980-06-24 Robert Bosch Gmbh Fuel injection pump for internal combustion engines

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54106423U (enExample) * 1978-01-12 1979-07-26
IT8223142V0 (it) * 1982-10-11 1982-10-11 Same Spa Gruppo di comando regolazione mandata per pompe di iniezione disposte in linea.
DE4143040C1 (enExample) * 1991-12-24 1993-07-08 Robert Bosch Gmbh, 7000 Stuttgart, De
WO2020254864A1 (en) 2019-06-21 2020-12-24 Lyeshukova Viktoriia Lotion for hair growth inhibition

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1184664A (fr) * 1957-08-13 1959-07-24 Bosch Gmbh Robert Pompe d'injection de combustible pour moteur à combustion interne
FR1374341A (fr) * 1963-02-07 1964-10-09 Fetok Gmbh Perfectionnement aux groupes de pompage à pistons multiples, notamment pour fours de l'industrie céramique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1184664A (fr) * 1957-08-13 1959-07-24 Bosch Gmbh Robert Pompe d'injection de combustible pour moteur à combustion interne
FR1374341A (fr) * 1963-02-07 1964-10-09 Fetok Gmbh Perfectionnement aux groupes de pompage à pistons multiples, notamment pour fours de l'industrie céramique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945773A (en) * 1973-09-05 1976-03-23 Sigma Diesel Hydraulic heads for injection pumps and the injection pumps themselves
US3985474A (en) * 1973-09-12 1976-10-12 Sigma Diesel Hydraulic heads for injection pumps and the injection pumps themselves
US4208998A (en) * 1976-10-15 1980-06-24 Robert Bosch Gmbh Fuel injection pump for internal combustion engines

Also Published As

Publication number Publication date
ES407184A1 (es) 1976-02-01
PL82144B1 (enExample) 1975-10-31
RO60608A (enExample) 1976-10-15
SU822768A3 (ru) 1981-04-15
JPS545057B2 (enExample) 1979-03-13
JPS4842224A (enExample) 1973-06-20
FR2155298A5 (enExample) 1973-05-18
IT968521B (it) 1974-03-20
CS158748B2 (enExample) 1974-11-25
GB1346009A (en) 1974-02-06
AT313649B (de) 1974-02-25
BE789559A (fr) 1973-01-15

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