US3363574A - Fuel injection pump - Google Patents

Fuel injection pump Download PDF

Info

Publication number
US3363574A
US3363574A US564633A US56463366A US3363574A US 3363574 A US3363574 A US 3363574A US 564633 A US564633 A US 564633A US 56463366 A US56463366 A US 56463366A US 3363574 A US3363574 A US 3363574A
Authority
US
United States
Prior art keywords
piston
regulating
fuel
throttle
regulating spool
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
US564633A
Other languages
English (en)
Inventor
Aldinger Ulrich
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3363574A publication Critical patent/US3363574A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/123—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor characterised by means for varying fuel delivery or injection timing
    • F02M41/125—Variably-timed valves controlling fuel passages
    • F02M41/127—Variably-timed valves controlling fuel passages valves being fluid-actuated slide-valves, e.g. differential rotary-piston pump

Definitions

  • the present invention relates to fuel injection pumps for internal combustion engines wherein the amount of fuel delivered is varied as a function of the engine speed.
  • the average force of the regulating spring changes after the occurrence of the liquid stop from a minimum value to a higher value, which increases with the increase of the liquid stop, until a stable speed has been reached for the corresponding opening of the control throttle and the vehicle load.
  • the change in the mean spring force corresponds to a certain degree of nonuniformity. In order to produce a satisfactory regulation, i.e., to reach quickly a stable speed under load or regulating throttle changes, this degree of non-uniformity should be as small as possible. However, it must not be too small, because in this case the regulation will be unstable.
  • the invention has the object of improving the degree of non-uniformity so that the regulation period between two stable speeds is as short as possible and so that the regulation remains stable at these speeds.
  • this object is realized in that the abutment supporting the side of the regulating spring remote from the regulating spool is displaceable by the regulating spring against an elastic means, and in that this displacement is hydraulically damped.
  • This elastic means comprises preferably a biased return spring.
  • a particularly good control may be obtained in that the abutment rests, under the bias of the return spring, against a stop until such time, as the liquid stop and with it the rise in the mean force of the regulating spring occurs.
  • a piston 1 of a fuel injection pump operates in a cylinder 2 and is actuated by a variable speed drive D operated by the internal combustion engine E so that it carries out a reciprocating axial movement and a rotating movement about its axis.
  • the piston serves as distributor by supplying fuel during the delivery stroke successively to individual conduits 3, arranged in equidistant spacing about the cylinder 2.
  • Each conduit 3, of which only one is shown in the drawing, contains a nonretum valve 4.
  • the peripheral surface of the piston 1 is provided with a distributing groove 5 which during 3,363,574 Patented Jan. 16, 1968 each successive delivery stroke of the piston connects the pump chamber 6 to a corresponding one of the delivery conduits 3.
  • This pump chamber is supplied with fuel through a passage 7, an annular groove 8, one of several longitudinal grooves 9 in the peripheral surface of the piston 1 and a supply bore 10 from a suction chamber 11.
  • This suction chamber 11 is supplied with fuel by a feed pump 12, for example, a gear pump, driven by the engine supplied with fuel by the injection pump.
  • the suction chamber 11 is connected to the inlet conduit 13 of the feed pump by a by-pass passage 14, which is provided with a restriction 15, the cross-section of which is controlled by a valve spool 16.
  • the valve spool 16 is subjected on one side to the fuel pressure in the suction chamber 11 and is displaced with increasing speed against the pressure of a return spring 17, causing the flow cross-section of the restriction 15 to be increased.
  • a regulating spool 13 serves for the quantity regulation of the fuel delivered to the engine during each delivery stroke of the piston 1.
  • This regulating spool controls the connection between the two sections 19a and 19b of a spill passage leading from the pump chamber.
  • the section 19b of the spill passage communicates through .a passage 20 with the suction chamber 11.
  • a spring 21 (regulating spring) tends to hold the regulating spool 12 in the inoperative position, determined by a flange 22 of the regulating spool and a fixed abutment stop 23. In this inoperative position, the regulating spool closes the spill passage 19a, 1%.
  • Advance of the regulating spool 18 is obtained by a piston 24, working in synchronism with the piston 1, and being preferably constructed as a stepped piston of the piston 1, and a cylinder 25 which receives fuel from the suction chamber 11 through a passage 10a whose opening into the cylinder is controlled by the piston 24.
  • the piston displaces fuel from its cylinder 25 through one of several longitudinal grooves 26 formed in the periphery of the piston 24 and through a passage 27 containing a non-return valve 28 into a cylinder 29.
  • the cylinder 29 contains the regulating spool 18 which is advanced against the force of the spring 21 by the fuel displaced by the auxiliary pump 24, 25 to interconnect the sections 19a and 19b of the spill passage.
  • the regulating spool 18 During the period between two delivery strokes of the piston 24, the regulating spool 18 returns into its inoperative position. During this return movement, the regulating spool, acted upon by the regulating spring 21, displaced a part of the fuel from the cylinder 29 through a throttle 39 (regulating throttle), provided in a passage 31 so that the return movement of the regulating spool is braked.
  • the flow cross-section of the regulating throttle 30 is preferably adjustable by means of a throttle needle 32.
  • the liquid stop i.e., the regulating spool no longer has time to return to its starting position and the extremities of its to and fro movement move in the direction of the regulating spring 21.
  • the amount of fuel delivered with each delivery stroke of the pump to one of the injection nozzles is reduced.
  • This displacement of the starting and finishing points of the travel of the regulating spool towards the regulating spring has the result that the mean force of the regulating spring 21 is increased. This also increases the degree of non-uniformity.
  • the end of the regulating spring 21 remote from the regulating spool 18 rests against an abutment piston 33, arranged in a cylinder 34 to be displaceable against the force of a return spring 35.
  • the cylinder 34 is connected by a passage 36 to the passage 20, terminatspeed of the pump,
  • the abutment piston 33 forces fuel during its movement, so that its movement is damped.
  • the blow cross-section of the damping throttle 37 is preferably adjustable (by means not shown in the drawing) whereby the damping throttle is adjusted as a function of the adjustment of the regulating throttle 30. At low speeds, the damping throttle 37 is closed so that the abutment piston 33 is retained in its initial position illustrated.
  • the chamber 38 which contains the regulating spring 21 and accommodates flange 22 of the regulating spool 18, communicates through a passage 39 with the passage 20.
  • the bias of the return spring 35 and the diameter of the abutment piston 33 are so chosen that the abutment piston 33 rests on an abutment stop 40 at low speeds, i.e., prior to the occurrence of the liquid stop, that is, so long as the mean force of the regulating spring 21 is at a minimum.
  • the abutment piston 33 has preferably a larger diameter than the regulating spool 18 so that the return spring can be made soft and the cross-section of the damping throttle 37 can be comparatively large.
  • the stifiness of the return spring 35 determines the reduced degree of non-uniformity
  • the cross-section of the damping throttle 37 determines the period of time which expires until the degree of non-uniformity has adjusted itself to a new value.
  • the regulating spool is to be rotated for starting and stopping the engine, it is provided with a shaft 41 which, as shown in the drawing, passes through the chamber 38, the abutment piston 33 and the chamber 34 towards the outside.
  • the shaft may alternatively be mounted on the other end of the regulating spool.
  • a fuel injection pump for an internal combustion engine having an injection piston and a regulating spool for terminating each fuel delivery stroke of said piston by advancing until it opens a spill passage, an auxiliary pump adapted to operate in synchronism with said piston for advancing the regulating spool during each pumping stroke against the force of a regulating spring, the regulating spring resting against an elastically yieldable abutment whose movement is hydraulically damped, and a throttle through which fuel is displaced by the regulating spool upon its return movement, said throttle braking such return movement so that when a certain speed is reached the regulating spool is prevented from returning to its initial position prior to beginning of the subsequent pumping stroke of said injection piston owing to the liquid stop phenomenon, and the amount of fuel delivered by the injection piston during each working stroke is reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US564633A 1965-07-12 1966-07-12 Fuel injection pump Expired - Lifetime US3363574A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR24399A FR1450727A (fr) 1965-07-12 1965-07-12 Perfectionnements apportés aux moyens de régulation des pompes d'injection de combustible

Publications (1)

Publication Number Publication Date
US3363574A true US3363574A (en) 1968-01-16

Family

ID=8584344

Family Applications (1)

Application Number Title Priority Date Filing Date
US564633A Expired - Lifetime US3363574A (en) 1965-07-12 1966-07-12 Fuel injection pump

Country Status (5)

Country Link
US (1) US3363574A (de)
AT (1) AT265749B (de)
DE (1) DE1253515B (de)
FR (1) FR1450727A (de)
GB (1) GB1154577A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403629A (en) * 1966-07-19 1968-10-01 Bosch Gmbh Robert Fuel injection pump for internal combustion engines
US3625638A (en) * 1969-02-12 1971-12-07 Bosch Gmbh Robert Timing and output control device for fuel injection pumps
US3627450A (en) * 1970-09-18 1971-12-14 Caterpillar Tractor Co Fuel control valve
US3796206A (en) * 1971-05-28 1974-03-12 Bosch Gmbh Robert Pump-and-nozzle assembly for injecting fuel in internal combustion engines
WO2001009513A1 (en) * 1999-07-30 2001-02-08 Crs Services, Inc. Hydraulic pump manifold

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449382A (en) * 1945-10-22 1948-09-14 Raul Pateras Pescara Fuel injection device
US3044404A (en) * 1959-12-01 1962-07-17 Bessiere Pierre Etienne Self-regulating reciprocating pumps, in particular for the injection of fuel into internal combustion engines
US3099219A (en) * 1958-05-19 1963-07-30 Bessiere Pierre Etienne Self-regulating reciprocating piston pumps, in particular for the injection of fuel into internal combustion engines
US3122099A (en) * 1960-10-27 1964-02-25 Expl Des Procedes Chimiques Et Self-regulating reciprocating pumps
US3122100A (en) * 1957-12-24 1964-02-25 Expl Des Procedes Chimiques Et Self-regulating pumps in particular for the injection of fuel into internal combustion engines
US3292546A (en) * 1964-02-11 1966-12-20 Cav Ltd Apparatus for supplying fuel to internal combustion engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT227480B (de) * 1959-12-01 1963-05-27 Pierre Etienne Bessiere Mit einer hin- und hergehenden Bewegung arbeitende Pumpe mit Selbstregelung der Förderleistung, insbesondere zur Brennstoffeinspritzung in Motoren

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449382A (en) * 1945-10-22 1948-09-14 Raul Pateras Pescara Fuel injection device
US3122100A (en) * 1957-12-24 1964-02-25 Expl Des Procedes Chimiques Et Self-regulating pumps in particular for the injection of fuel into internal combustion engines
US3099219A (en) * 1958-05-19 1963-07-30 Bessiere Pierre Etienne Self-regulating reciprocating piston pumps, in particular for the injection of fuel into internal combustion engines
US3044404A (en) * 1959-12-01 1962-07-17 Bessiere Pierre Etienne Self-regulating reciprocating pumps, in particular for the injection of fuel into internal combustion engines
US3122099A (en) * 1960-10-27 1964-02-25 Expl Des Procedes Chimiques Et Self-regulating reciprocating pumps
US3292546A (en) * 1964-02-11 1966-12-20 Cav Ltd Apparatus for supplying fuel to internal combustion engines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403629A (en) * 1966-07-19 1968-10-01 Bosch Gmbh Robert Fuel injection pump for internal combustion engines
US3625638A (en) * 1969-02-12 1971-12-07 Bosch Gmbh Robert Timing and output control device for fuel injection pumps
US3627450A (en) * 1970-09-18 1971-12-14 Caterpillar Tractor Co Fuel control valve
US3796206A (en) * 1971-05-28 1974-03-12 Bosch Gmbh Robert Pump-and-nozzle assembly for injecting fuel in internal combustion engines
WO2001009513A1 (en) * 1999-07-30 2001-02-08 Crs Services, Inc. Hydraulic pump manifold
US6568919B1 (en) * 1999-07-30 2003-05-27 Crs Services, Inc. Hydraulic pump manifold
US20030143085A1 (en) * 1999-07-30 2003-07-31 Fletcher Peter C. Hydraulic pump manifold
US6729854B2 (en) 1999-07-30 2004-05-04 Crs Services, Inc. Hydraulic pump manifold

Also Published As

Publication number Publication date
AT265749B (de) 1968-10-25
GB1154577A (en) 1969-06-11
FR1450727A (fr) 1966-06-24
DE1253515B (de) 1967-11-02

Similar Documents

Publication Publication Date Title
US1974851A (en) Governor for internal combustion engines
US3699939A (en) Fuel injection pump for internal combustion engines and method of fuel control
US1967101A (en) Fuel feed mechanism
US4211203A (en) Fuel injection pump
US3638631A (en) R.p.m. regulator for fuel injection pumps
US2055578A (en) Fuel supply and regulating system for internal combustion engines
US4125104A (en) Fuel injection pump for internal combustion engines
US2657631A (en) Liquid fuel pump
US3363574A (en) Fuel injection pump
US3620648A (en) Fuel injection system for internal combustion engines
GB2076075A (en) A fuel injection pump for internal combustion engines
US3827832A (en) Means for reducing fuel delivery of fuel injection pumps in the low rpm range
US4271805A (en) Fuel injection pump
US4652221A (en) Fuel injection pump for internal combustion engines
US3403629A (en) Fuel injection pump for internal combustion engines
US5007400A (en) Hydraulic control device for fuel injection systems of internal combustion engines
US3644064A (en) Fuel injection pump for internal combustion engines
US2253454A (en) Fuel injection apparatus for diesel and other internal combustion engines
US4685870A (en) Fuel injection pump for internal combustion engines
US2947257A (en) Reciprocating piston pumps, in particular for the injection of fuel
GB1594006A (en) Fuel injection system
US5263457A (en) Fuel injection pump for internal combustion engines
US2946287A (en) Self-regulating piston pumps, in particular fuel injection pumps for internal combustion engines
US3044404A (en) Self-regulating reciprocating pumps, in particular for the injection of fuel into internal combustion engines
US3505984A (en) Fuel injection systems for internal combustion engines