US3811799A - Liquid fuel pumping apparatus - Google Patents

Liquid fuel pumping apparatus Download PDF

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Publication number
US3811799A
US3811799A US00297066A US29706672A US3811799A US 3811799 A US3811799 A US 3811799A US 00297066 A US00297066 A US 00297066A US 29706672 A US29706672 A US 29706672A US 3811799 A US3811799 A US 3811799A
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US
United States
Prior art keywords
piston
cylinder
fuel
pressure
injection pump
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
US00297066A
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English (en)
Inventor
G Jackson
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.)
CAV Ltd
Original Assignee
CAV Ltd
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 CAV Ltd filed Critical CAV Ltd
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Publication of US3811799A publication Critical patent/US3811799A/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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/16—Adjustment of injection timing
    • F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
    • F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
    • 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
    • F02M41/14—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 rotary distributor supporting pump pistons
    • F02M41/1405—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 rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
    • F02M41/1411—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 rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis characterised by means for varying fuel delivery or injection timing
    • F02M41/1416—Devices specially adapted for angular adjustment of annular cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/16—Adjustment of injection timing
    • F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
    • F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
    • F02D2001/186—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic using a pressure-actuated piston for adjustment of a stationary cam or roller support

Definitions

  • a fuel-pumping apparatus includes a member adjustable to vary the timing of injection of fuel to the engine and which is operated-by a fluid pressure operable device which comprises a first piston of cupshaped form and having its open end subjected to a speed dependent pressure which moves it against a first spring and the apparatus also includes a second piston located within the first piston and connected to said member. The second piston is also subjected to vsaid speed dependant pressure but is capable of limited movement relative to the first piston. Means is provided to control the pressure in the space between the two pistons in accordance with the setting of the throttle member of the apparatus.
  • said fluid pressure operable means comprises in combination, a cup shaped piston mounted within a first cylinder, first resilient means for urging said piston towards one end of said cylinder, said cup shaped piston defining a second cylinder having its closed end remote from said one end of said first cylinder, a second piston'mounted in said secondcylinder, second resilient means for urging said second piston away from the closed end of said second cylinder,
  • FIG. 1 is a sectional side elevation showing one form of pumping apparatus to which the invention can be applied, and 1 I FIG. 2 shows to enlarged scale a portion of the apparatus not seen in FIG. 1.
  • a body part 1 which at one end contains a feed pump 2 of the kind comprising a rotaryimpeller provided with vanes.
  • the inlet 3 and outlet 4 of this pump are interconnected through a relief valve 5 which regulates the pressure of fuel delivered to the rest of the apparatus in a manner-dependent upon the speed of this pump.
  • a fuel injection pump which comprises a rotary head 6 formed at one end of a distributor 12 which serves to interconnect the rotary parts of the feed and injection pumps.
  • Formed in the head is a transverse bore 7 containing a pair of 'reciprocable plungers 8 which through rollers 9 at their. outer ends co-operate with a surrounding annular cam 10.
  • the distributor is adapted to be driven in synchronism with an engine with which it is associated, through a drive shaft 11.
  • Fuel from the feed pump 2 is fed through a passage 13 in the body part to'an annular groove 14 in the periphery of the distributor and thence by way of a throttle valve l5to a passage 16 in the body part which registers in turn as the distributor rotates, with a plurality of radially disposed passages 17 formed in the distributor.
  • the passages 17 are in communication with. an axial passage 18 in the distributor which opens at one end into the bore 7 in the head.
  • a radial passage 19 which is adapted to register in turn and as the distributor rotates with a plurality of outlet ports 20 formed in the body part and which are adapted for connection to the injection nozzles respectively of the cylinders of the associated engine.
  • Fuel from the feed pump is fed intermittently by way of the throttle valveto the axial passage 18 in the distributor and thus serves to move the plungers of the injection pump outwardly. At appropriate instants in the cycle the plungers are moved inwardly by the action of the cam and thereby serve to discharge fuel-in turn to the engine cylinders.
  • an extension 21 in which is formed a first cylinder 22 and slidable within this cylinder is a cup shaped piston 23.
  • the piston 23 is loaded towards one end of the cylinder by a pair of coiled compression springs 24 and is movable in the opposite direction by fuel under pressure which is derived from the passage 13 and flows to the cylinder by way of a passage 13a formed in an end closure in the in the form of a plug 26.
  • the piston 23 defines a second cylinder 25 the closed end of which is remotefrom said one end of the cylinder 22, the latter being closed by the plug 26.
  • a second piston 27 Located within the cylinder 25 is a second piston 27 and this is provided with a centrally disposed recess 28 in which is engaged a projection 29 extending outwardly from the cam 10.
  • the first piston 23 is provided with a longitudinal slit in its wall.
  • the second piston 27 is loaded towards the plug 26 by means of a second coiled compression spring 30 and the extent of relative movement of the pistons underthe action of the spring 30 is limited by a stop which is in the form of a circlip' 31 mounted within a groove formed in the inner peripheral wall of the piston 23.
  • the extent of relative movement of the pistons against the action of the spring 30 is determined by a projection on the piston 27 and which abuts against the end wall of the cylinder 25.
  • the closed end of the cylinder 25 communicates by way of registering ports in the piston 23 and the casing 21, with a valve 32.
  • the valve 32 is a selector valve whereby the closed end of the cylinder may be brought into communication with the passage 13 or alternatively with a drain.
  • the valve 32 is constituted by the throttle valve 15 and the arrangement of the valve is such that when the throttle valve is set to provide the maximum amount of fuelthen the closed end of the cylinder 25 will communicate with the passage 13. When the throttle valve is moved to reduce the quantity of fuel supplied to the associated engine then the closed end of the cylinder 25 is placed in communication with the drain.
  • the srping 30 is a light spring so that relative movement of the pistons 23 and 27 can occur even at low engine speeds when the output pressure of the feed pump is relatively low.
  • a liquid fuel pumping apparatus for supplying fuel to internal combustion engines theappar atus being of the kind comprising an injection pump adapted to be driven in timed relationship with an associated engine, the injection pump including a rotary body in which is defined a bore, a fuel transfer passage communicating with said bore, reciprocable plunger in the bore, cam means surrounding said body and operable to effect inward movement to the plunger to displace fuel through said transfer passage as the body rotates, a feed pump for supplying fuel under pressure through said fuel transfer passage to the injection pump, valve means for varying the outlet pressure of the feed pump so that it varies in accordance with the speed of the associated engine, a throttle member for controlling the quantity of fuel supplied to the injection pump and thereby controlling the quantity of fuel supplied to the associated engine, and fluid pressure operable means for controlling the setting of said cam means thereby to adjust the timing of delivery of fuel by the injection pump, said fluid pressure operable means comprising in combination, a cup shaped piston mounted within a first cylinder, first resilient means for urging said piston towards one end of said cylinder,

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
  • Reciprocating Pumps (AREA)
US00297066A 1971-10-15 1972-10-12 Liquid fuel pumping apparatus Expired - Lifetime US3811799A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4801971A GB1403524A (en) 1971-10-15 1971-10-15 Liquid fuel pumping apparatus

Publications (1)

Publication Number Publication Date
US3811799A true US3811799A (en) 1974-05-21

Family

ID=10447076

Family Applications (1)

Application Number Title Priority Date Filing Date
US00297066A Expired - Lifetime US3811799A (en) 1971-10-15 1972-10-12 Liquid fuel pumping apparatus

Country Status (12)

Country Link
US (1) US3811799A (es)
JP (1) JPS5212852B2 (es)
AR (1) AR192670A1 (es)
AU (1) AU468758B2 (es)
BR (1) BR7207200D0 (es)
CA (1) CA970217A (es)
DE (1) DE2250688C3 (es)
ES (1) ES407886A1 (es)
FR (1) FR2157495A5 (es)
GB (1) GB1403524A (es)
IT (1) IT972376B (es)
ZA (1) ZA727175B (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4146003A (en) * 1976-06-26 1979-03-27 Lucas Industries Limited Fuel injection pumping apparatus with drain passage
US4508489A (en) * 1983-01-11 1985-04-02 Lucas Industries Public Limited Company Fuel injection pumps

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2648991A1 (de) * 1976-10-28 1978-05-03 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
GB8528922D0 (en) * 1985-11-23 1986-01-02 Lucas Ind Plc Fuel injection pumping apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1182525A (fr) * 1956-09-07 1959-06-25 Cav Ltd Pompe à combustible liquide pour moteurs à combustion interne
FR1319014A (fr) * 1962-04-02 1963-02-22 Bosch Gmbh Robert Pompe d'injection pour moteur à combustion interne
US3486492A (en) * 1967-11-07 1969-12-30 Allis Chalmers Mfg Co Timing advance mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4146003A (en) * 1976-06-26 1979-03-27 Lucas Industries Limited Fuel injection pumping apparatus with drain passage
US4508489A (en) * 1983-01-11 1985-04-02 Lucas Industries Public Limited Company Fuel injection pumps

Also Published As

Publication number Publication date
DE2250688C3 (de) 1978-06-15
DE2250688A1 (de) 1973-04-19
IT972376B (it) 1974-05-20
DE2250688B2 (de) 1977-10-13
JPS5212852B2 (es) 1977-04-09
AU4768072A (en) 1974-04-26
CA970217A (en) 1975-07-01
AU468758B2 (en) 1976-01-22
BR7207200D0 (pt) 1973-08-21
JPS4847603A (es) 1973-07-06
AR192670A1 (es) 1973-02-28
FR2157495A5 (es) 1973-06-01
ES407886A1 (es) 1975-11-16
GB1403524A (en) 1975-08-28
ZA727175B (en) 1973-06-27

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