US2545664A - Fuel injection pump mechanism - Google Patents

Fuel injection pump mechanism Download PDF

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Publication number
US2545664A
US2545664A US742778A US74277847A US2545664A US 2545664 A US2545664 A US 2545664A US 742778 A US742778 A US 742778A US 74277847 A US74277847 A US 74277847A US 2545664 A US2545664 A US 2545664A
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United States
Prior art keywords
gear
plunger
pump
housing
pump assembly
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Expired - Lifetime
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US742778A
Inventor
Lloyd E Johnson
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Caterpillar Inc
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Caterpillar Tractor Co
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Priority to US742778A priority Critical patent/US2545664A/en
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Publication of US2545664A publication Critical patent/US2545664A/en
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    • 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
    • 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

  • Lam BY ATTURNEY its rotation with relation thereto. 45,is cut away or notched as indicated at 49 and the control gear 34, as shown in Fig. 2, is relieved as at 50.
  • the plunger gear 32 is retained against rotation away from its no fuel position by the following mechanism. Referring to Figs. 1 and 3 the cup shaped member 26 surrounding the "plunger gear 32 is shown as held against rotation with relation to the sleeve 22 within which it in the edge of the washer 25 so that in assembly [the top surface of the key is engaged and the key retained against vertical displacement by v-pressure .of the spring 23 where it seats on the Qiwasher 25.
  • a dished washer 45 (Figs. 1, 4 and 5) is retained in, and serves as an end member for the sleeve 22 by means of a snap ring 46.
  • This washer has ears 41 projecting radially and engageable with notches 48 in the bottom of the sleeve to prevent The washer It is, therefore, only when the notched portion 45 of the washer properly registers with the control gear in its no fuel position that the fuel pump assembly can be withdrawn from the bore II in the pump housing.
  • the gear 32 is held against rotation by the following means.
  • An upwardly projecting ear 52 is bent from the washer 45 and adapted to register with a perforation 53 (see Fig. 5) in the bottom gear 32 is in its no fuel position, the spring 23 urges the plunger, together with its gear and cup 26, downwardly because upon withdrawal the lower end of the plunger I5 is no longer restrained by the cam 30.
  • the downward movement of the cup 26 under influence of the spring 23 is limited at the position illustrated in Fig. 5 wherein'the cup engages the washer45, and in this position the ear 52 extends through the perforations 53 and into the slot 54 to prevent rotation of the gear 32 and thus to retain the gear in its proper phase position for re-assembly.
  • the washer member prevents removal of the pump assembly from its housing except when the meshing gears "are both in a pre-determined phase position. Furthermore, it prevents re-assembly unless'the gears are in this position and it serves, through its upwardly bent ear 52, to prevent rotation of the pump plunger away from this pre-determined position while the parts are disassembled.
  • control gear 34 herein illustrated is representative of any control member adapted to register or mesh with the plunger gear 32 and may be varied in its construction without forfeiting the advantages of the present invention.
  • a straight rack-bar is employed for registry with the plunger gears of a plurality of aligned fuel injection pumps and the invention herein described will apply in such construction so long as means are provided for establishing a definite no fuel position of the rack-bar.
  • a pump housing a pump assembly removably disposed in the housing, means for adjusting the pump including parts carried by the housing and parts carried by the pump assembly and registering with each other, and means to prevent removal or replacement of the pump assembly except when the registering parts are in a predetermined phase position, and means operable upon removal of the pump assembly to retain said parts carried by the pum 2.
  • a pump housing a pump assembly removably disposed in the housing and including a plunger adjustable by rotation for metering fuel delivered by the pump, a gear like part on the plunger, a gear like part in the housing meshing therewith and adapted to be controlled by an engine governor, and means to prevent removal of the pump assembly from the housing except when said meshing gear parts are in a predetermined phase position, and means effective upon removal of the pump assembly to lock the plunger against rotation in the pump assembly.
  • a fuel injection pump for an internal combustion engine, a pump housing, a pump assembly removably disposed in the housing and including a plunger adjustable by rotation for metering fuel delivered by the pump, a gear on the plunger, a control gear in the housing meshing therewith and associated with an engine governor, means to stop the control gear in a predetermined phase position, said control gear having a relieved portion in its periphery, and means on the pump assembly preventing its removal except through said relief when the control gear is'in said position.
  • a fuel injection pump for an internal combustion engine, a pump housing, a pump assembly removably disposed in the housing and including a plunger adjustable by rotation for metering fuel delivered by the pump, a gear on the plunger, a control gear in the housing meshing therewith and associated with an engine governor, means to stop the control gear in a predetermined phase position, said control gear having a relieved portion in its periphery, and means on the pump assembly preventing its removal except through said relief when the control gear is in said position, and means for locking the plunger gear against rotation in the pump assembly in a corresponding phase position when the pump assembly is removed from the housing, and releasing the plunger gear when the pump assembly is replaced in the housing.
  • a fuel injection pump assembly adapted to be contained by a pump housing and having a plunger of the metering type with a gear for imparting metering adjustment thereto, a sleeve surrounding the plunger and having an end member through which the plunger extends for engagement with an actuating cam, spring means in the sleeve urging the plunger into contact with said cam and tending when the assembly is removed from the housing to position the gear on the plunger adjacent the end member of the sleeve. and means carried by said end member and engageable with the gear to prevent its rotation in the pump assembly while the pump assembly is removed from the housing.
  • a fuel injection pump for an internal combustion engine, a pump housing, a pump assembly removably disposed in the housing and including a plunger adjustable by rotation for metering fuel delivered by the pump, a gear like part on the plunger, a gear like part in the housing meshing therewith and adapted to be controlled by an engine governor, means to prevent removal of the pump assembly from the housing except When said meshing gear parts are in a predetermined phase position, a spring for retracting the plunger, and means actuated by said spring upon removal of the pump assembly to hold said first named gear like part against rotation in the assembly.

Description

March 20, 1951 L. E. JOHNSON 2,545,564
FUEL INJECTION PUMP MECHANISM Filed April 21, 1947 2 Sheets-Sheet l IN VEN TOR.
A/0,15 54m W ATTORNEY March 20, 1951 E. JOHNSON 2,545,664
FUEL INJECTION PUMP MECHANISM Filed April 21, 1947 2 Sheets-Sheet 2 INVENTOR.
1/ /44 Lam BY ATTURNEY its rotation with relation thereto. 45,is cut away or notched as indicated at 49 and the control gear 34, as shown in Fig. 2, is relieved as at 50.
3. in Fig. 2, and meshes with a control gear 34 fixed to and rotatable with a shaft 35. The shaft 35 is connected through mechanism, not illustrated, with similar shafts for other pumps of multicylinder engines and with the engine governor control for rotatable adjustment related to the fuel requirements of the engine as is common practice. Thus, as the governor responds to the demands of the engine for more or less fuel, the shaft 35 is rotated. Through the meshing gears 32 and 34 the plunger is rotatably adjusted to efiect metering of the required amount of fuel through its scroll shape relief Hi. It is apparent, therefore, that in placing the pump assembly into the pump housing, it is essential that the gears 32 and 34 come into meshing engagement in their proper phase positions in order to maintain the required relationship between plunger positions of the several pumps and the governor setting.
This is accomplished by a construction of the pump assembly designed to prevent its removal from or insertion into the pumphousing except when both of the gears 32 and 34 are in a certain position. For convenience, this position has been taken as the shut-off or no fuel position of the governor and the plunger. of the drawings, this position is established on the gear 34 by a shoulder 38 engageable with a stop As shown in Fig. 2
screw 39 arranged to project through the housing enclosing the gear.
The plunger gear 32 is retained against rotation away from its no fuel position by the following mechanism. Referring to Figs. 1 and 3 the cup shaped member 26 surrounding the "plunger gear 32 is shown as held against rotation with relation to the sleeve 22 within which it in the edge of the washer 25 so that in assembly [the top surface of the key is engaged and the key retained against vertical displacement by v-pressure .of the spring 23 where it seats on the Qiwasher 25.
A dished washer 45 (Figs. 1, 4 and 5) is retained in, and serves as an end member for the sleeve 22 by means of a snap ring 46. This washer has ears 41 projecting radially and engageable with notches 48 in the bottom of the sleeve to prevent The washer It is, therefore, only when the notched portion 45 of the washer properly registers with the control gear in its no fuel position that the fuel pump assembly can be withdrawn from the bore II in the pump housing.
"To prevent rotation of the pump plunger and the plunger gear 32 after the assembly has been withdrawn and, therefore, to insure that the v gears 32 and 34 will be in their proper phase positions upon re-insertion of the pump assembly,
the gear 32 is held against rotation by the following means. An upwardly projecting ear 52 is bent from the washer 45 and adapted to register with a perforation 53 (see Fig. 5) in the bottom gear 32 is in its no fuel position, the spring 23 urges the plunger, together with its gear and cup 26, downwardly because upon withdrawal the lower end of the plunger I5 is no longer restrained by the cam 30. The downward movement of the cup 26 under influence of the spring 23 is limited at the position illustrated in Fig. 5 wherein'the cup engages the washer45, and in this position the ear 52 extends through the perforations 53 and into the slot 54 to prevent rotation of the gear 32 and thus to retain the gear in its proper phase position for re-assembly.
When the construction described the washer member prevents removal of the pump assembly from its housing except when the meshing gears "are both in a pre-determined phase position. Furthermore, it prevents re-assembly unless'the gears are in this position and it serves, through its upwardly bent ear 52, to prevent rotation of the pump plunger away from this pre-determined position while the parts are disassembled. I
The control gear 34 herein illustrated is representative of any control member adapted to register or mesh with the plunger gear 32 and may be varied in its construction without forfeiting the advantages of the present invention. For example, in some installations a straight rack-bar is employed for registry with the plunger gears of a plurality of aligned fuel injection pumps and the invention herein described will apply in such construction so long as means are provided for establishing a definite no fuel position of the rack-bar.
' I claim:
1. In a fuel injection pump for an internal combustion engine, a pump housing, a pump assembly removably disposed in the housing, means for adjusting the pump including parts carried by the housing and parts carried by the pump assembly and registering with each other, and means to prevent removal or replacement of the pump assembly except when the registering parts are in a predetermined phase position, and means operable upon removal of the pump assembly to retain said parts carried by the pum 2. In a fuel injection pump for an internal combustion engine, a pump housing, a pump assembly removably disposed in the housing and including a plunger adjustable by rotation for metering fuel delivered by the pump, a gear like part on the plunger, a gear like part in the housing meshing therewith and adapted to be controlled by an engine governor, and means to prevent removal of the pump assembly from the housing except when said meshing gear parts are in a predetermined phase position, and means effective upon removal of the pump assembly to lock the plunger against rotation in the pump assembly.
3. In a fuel injection pump for an internal combustion engine, a pump housing, a pump assembly removably disposed in the housing and including a plunger adjustable by rotation for metering fuel delivered by the pump, a gear on the plunger, a control gear in the housing meshing therewith and associated with an engine governor, means to stop the control gear in a predetermined phase position, said control gear having a relieved portion in its periphery, and means on the pump assembly preventing its removal except through said relief when the control gear is'in said position.
4. In a fuel injection pump for aninternal means on the pump assembly preventing its removal except through said relief when the control gear is in said position, and means for looking the plunger gear against rotation in the pump assembly in a corresponding phase position when the pump assembly is removed from the housing.
5. In a fuel injection pump for an internal combustion engine, a pump housing, a pump assembly removably disposed in the housing and including a plunger adjustable by rotation for metering fuel delivered by the pump, a gear on the plunger, a control gear in the housing meshing therewith and associated with an engine governor, means to stop the control gear in a predetermined phase position, said control gear having a relieved portion in its periphery, and means on the pump assembly preventing its removal except through said relief when the control gear is in said position, and means for locking the plunger gear against rotation in the pump assembly in a corresponding phase position when the pump assembly is removed from the housing, and releasing the plunger gear when the pump assembly is replaced in the housing.
6. In a fuel injection pump assembly adapted to be contained by a pump housing and having a plunger of the metering type with a gear for imparting metering adjustment thereto, a sleeve surrounding the plunger and having an end member through which the plunger extends for engagement with an actuating cam, spring means in the sleeve urging the plunger into contact with said cam and tending when the assembly is removed from the housing to position the gear on the plunger adjacent the end member of the sleeve. and means carried by said end member and engageable with the gear to prevent its rotation in the pump assembly while the pump assembly is removed from the housing.
7. In a fuel injection pump for an internal combustion engine, a pump housing, a pump assembly removably disposed in the housing and including a plunger adjustable by rotation for metering fuel delivered by the pump, a gear like part on the plunger, a gear like part in the housing meshing therewith and adapted to be controlled by an engine governor, means to prevent removal of the pump assembly from the housing except When said meshing gear parts are in a predetermined phase position, a spring for retracting the plunger, and means actuated by said spring upon removal of the pump assembly to hold said first named gear like part against rotation in the assembly.
LLOYD E. JOHNSON.
REFERENCES orrEn The following references are of record in the iile of this patent:
UNITED STATES PATENTS Number Name Date 1,974,858 Baur et al Sept. 25, 1934 2,185,144 Edwards Dec. 26, 1939 2,187,732 De Juhasz Jan. 23, 1940 2,372,694 Tabb Apr. 3, 1945
US742778A 1947-04-21 1947-04-21 Fuel injection pump mechanism Expired - Lifetime US2545664A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2849997A (en) * 1954-09-10 1958-09-02 Licencia Talalmany Okat Erteke Fuel injection pumps for internal combustion engines
DE1132382B (en) * 1960-12-02 1962-06-28 Friedmann & Maier Ag Injection pump for internal combustion engines
US4023916A (en) * 1975-03-27 1977-05-17 Vysoke Uceni Technicke Cylinder-cylinder head mounting arrangement for diesel-type fuel injection pumps
US4286931A (en) * 1978-02-16 1981-09-01 Robert Bosch Gmbh Fuel injection pump for internal combustion engines, particularly for diesel engines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1974858A (en) * 1931-04-28 1934-09-25 Bosch Robert Centrifugal governor for internal combustion engines
US2185144A (en) * 1937-05-27 1939-12-26 Timken Roller Bearing Co Fuel injection pump
US2187732A (en) * 1936-02-14 1940-01-23 Juhasz Kalman John De Fuel injection pump for diesel engines
US2372694A (en) * 1942-02-04 1945-04-03 Reconstruction Finance Corp High-pressure fluid pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1974858A (en) * 1931-04-28 1934-09-25 Bosch Robert Centrifugal governor for internal combustion engines
US2187732A (en) * 1936-02-14 1940-01-23 Juhasz Kalman John De Fuel injection pump for diesel engines
US2185144A (en) * 1937-05-27 1939-12-26 Timken Roller Bearing Co Fuel injection pump
US2372694A (en) * 1942-02-04 1945-04-03 Reconstruction Finance Corp High-pressure fluid pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2849997A (en) * 1954-09-10 1958-09-02 Licencia Talalmany Okat Erteke Fuel injection pumps for internal combustion engines
DE1132382B (en) * 1960-12-02 1962-06-28 Friedmann & Maier Ag Injection pump for internal combustion engines
US4023916A (en) * 1975-03-27 1977-05-17 Vysoke Uceni Technicke Cylinder-cylinder head mounting arrangement for diesel-type fuel injection pumps
US4286931A (en) * 1978-02-16 1981-09-01 Robert Bosch Gmbh Fuel injection pump for internal combustion engines, particularly for diesel engines

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