US3834184A - Centrifugal injection timing control device for fuel injection pumps in diesel engines - Google Patents

Centrifugal injection timing control device for fuel injection pumps in diesel engines Download PDF

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Publication number
US3834184A
US3834184A US00376186A US37618673A US3834184A US 3834184 A US3834184 A US 3834184A US 00376186 A US00376186 A US 00376186A US 37618673 A US37618673 A US 37618673A US 3834184 A US3834184 A US 3834184A
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United States
Prior art keywords
stub
return spring
bolt
flyweight
camshaft
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Expired - Lifetime
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US00376186A
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English (en)
Inventor
E Hofmann
H Lehmann
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • F02D1/162—Adjustment of injection timing by mechanical means dependent on engine speed for angular adjustment of driving and driven shafts
    • 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

Definitions

  • PAIENIEU str1 01914 SHEET 10F 2 1 CENTRIFUGAL INJECTION TiMiNG CONTROL DEVICE FOR FUEL INJECTION PUMPS IN DIESEL ,ENGINES BACKGROUND OF THE INVENTION sel engi-nes which device comprises (a) at least one flyweight which swivels against the force of at leastone compressible return spring and which changes, by its vswivelling movements and in dependence on the rpm of the engine, the mutual rotary position of two coaxially arranged shafts, one of which is a camshaft of the fuel injection pump'and serves as the driven shaft and the other of which serves as -the drivingshaft, and which lyweight is supported on a bolt being connected to the driving shaft and having an' axis which is parallel thereto; (b) first abutment means for the return spring, associated with' the driven shaft, and (c) second abutment means for the return spring being supported articulatedly on a stub of the
  • pressed by an angle of adjustment QS is controllable from a cam track which is built into a'lever-shap'ed motion transmitting member being rigidly connected to the camshaft for movement with the latter.
  • the rpm range in which the device operates, and the angle of adjustment by which the rotary positions of the two shafts are adjusted to each other can be adapted to the fuel injection system in which the timing device is used, and to the engine to which the system pertains, by a corresponding adjustment ofthe force of the return spring.
  • This is achieved in a known manner by replacing the return spring with another having a different resilience and/or by the insertion of washers at the abutments ofthe spring. In the latter case, the initial tension of the spring is altered, thereby determining the rpm at which the timing device begins to operate.
  • centrifugal timing devices of the initially described type with a device for limiting the changes in the mutual rotary position of the driving and the driven shafts to several predetermined angles of adjustment.
  • This device is, for example, needed when using a timing device in a series of engines which can be adjusted to different full-load performance values by limiting the full-load rpm without requiring any other essential changes.
  • Such rpms also require corresponding angles of adjustment d.
  • the most important reason for this limitation of the angles of adjustment da resides in the need for ceasing or stopping the adjusting motion when the fullload rpm has been attained. If no such limitation is provided the timing device tends to vibrate when fluctuations occur in the moment of rotation or the rpm.
  • the initially described known centrifugal timing device is provided with a bolt projecting from the flyweight thereon which bolt is inserted in a slot of -a limiting disc, the length of which slot limits the motion of the flyweight, thereby limiting also the arbitrarily determin able change in the mutual rotary position of the two shafts;
  • this previously suggested timing device is furthermore provided with a ring mounted on the bolt portion projecting from under the flyweight which ring abuts an inner edge remote from the rotational axis of the timing device of a recess provided in the driving shaft, and the external diameter of which ring is dimensioned in correspondence with the determinable change in the mutual rotary position of the two shafts.
  • the driving shaft In order to be able to exchange the aforesaid ring or the limiting disc, the driving shaft must be detached from the camshaft of the pump, which is only possible by removing the return springs. For this purpose, it is therefore necessary to disassemble the camshaft at least partly or entirely.
  • the device for limiting changes in the mutual rotary positions of the shafts and/or the return springs become freely accessible.
  • the bridge is provided with a semi-circular interior boundary face, having a radius equal to the radius of vexemplary embodiments takenin conjunction with the drawings.
  • FIG. l shows a preferred embodiment of the timing device according tothe invention in a sectional view, taken in the'planesd'efined Iby line I'-l in FIG. 2;
  • FIG. 2 shows a sectional view of the same embodiment, taken in a plane along line lII.-II, in FIG. 1;
  • FIG. 3 shows an enlarged view in perspective of a y designated by 46 in FIGS. 1
  • the camshaft l'of an injection pump l1' bears a centrifugal timing device 12 which comprises a driving flange 13 serving as driving shaft, which is supported on a vshaft member 14 of .camshaft 10, and which bears a number of pins 15 whose axes are parallel to the axis of the camshaft 10, on which pins flyweights 18 are mounted for swivelling movement.
  • Camshaft 10 serves as the driven shaft of the timing device.
  • a clutch disc 22 provided with claws 21 is mounted on a protruding stub 20 of driving -flange 13, and is connected with the driving flange 13 by means of screws entered into bores from the frontal face of flange 13.
  • the timing device l2 is coupled to the driving members (not shown) of an internal combustion engine by means of a second clutch member (also not shown) which engages the claws 21 of clutch disc 22.
  • a pinion may be used when a gear drive is employed.
  • Each of the flyweights 18 is provided with a bolt 25, spaced from its swiveling point about pin l5; the bolt bears a roller 26 engaging a cam track 27 which is provided on a lever-shaped motiontransmitting member 28; member 28 is rigidly mounted on camshaft 10 as an undetachable part of the latter.
  • Roller 26 is secured against axial shifting by means of a retaining ring 29 fastened on bolt at its terminal portion 25a, and by a collar 30 mounted on the other terminal portion 25b of bolt 25 projecting beyond flyweight 18 which terminal portion 25h extends into a recess 31 of the discshaped part 32 of the driving flange 13v and is guidedl therein during swivelling displacements of the fly weights 18.
  • the crosssectional configuration of recess 31 in the illustrated embodiment is of round shape (see FIG. 2), but it may also have any other shape', as long as the full swivelling rotation of bolt 25 or of bolt-portion 25b and collar 30 thereon is not impeded.
  • the collars 30 limit the swivelling path of the flyweights 18 to a size which determines a given, arbitrarilyadjustable change in the pivoting position (angle of adjustment rbf) of driving flangel 13 relative to the camshaft 10; consequently, the angle of adjustment of the timing device-can be alteredby replacing the collars 30 by others' havinga different diameter.
  • the timing device is provided with lubricating bores 41, 41a and 41b, for lubricating the bearings4 of flange 13 and the othervparts of thetiming device, and is surrounded, as a protection against loss of lubricant, by a casing 42 ⁇ which is rigidly mounted on the injection pump 11'.
  • Casing42 is provided with agasket 43 which seals the timing device 12, also when the latter rotates during operation, against the outside.
  • the centrifugal forces of the flyweights 18 which occur during operation of the timing device 12, are counteracted by pairs of compression springs 45 which are supported on two abutments 46 and 48, thefirst of which, 4 6', is provided on the lever-shaped member 28, in the form of trunnions for centering the springs 45.
  • the second abut- 4ment is constituted by a bracket 48 and is mounted articulatedly on stub 15a of flyweight-bearing pin l5 which protrudes in axial direction from the flyweight 18 thereon.
  • the spring-bearing bracket 48 is provided with a Bridge 51 and groove 52 together position bracket 48 in the axial direction.
  • Bridge 5l has an inner face 53 of circular cross-section theradius of which is equal to the radius of the bearing face 50, and the circular arc described by the bridge face 53 is displaced relative to the circular arc of face 50 by almost the depth t of the annular groove 52 in the direction towards the aperture of U-shaped bearing face 50, i.e., toward the end faces 49 of bracket 48.
  • the displacement is slightly smaller than the depth t of the annular groove 52 in order to ensure that the bridge 51 does not rest on the bottom of annular groove 52.
  • the compression springs 45 serve to press the free end portions 18a of flyweights 18 inwardly, which is, in particular, attained by a corresponding shape of cam track 27 on the lever-'shaped member 28'.
  • the flyweights 18 swivel outwardly against the force of the compression springs 45 in the direction indicated by arrow 60, and turn the driven elements 28 and 10 from their positions with regard to the driving elements 13 and 22 of the timing device until the collars 30 contact the inner edges 33 of the recesses 31.
  • an adjustment of the angle d, to 3, 4, 5, 6 or 7 between the driving flange 13 and the camshaft 5 l of the injection pump l 1 may be effected.
  • the maximalangle of adjustment ibmax, e.g. 8, is attained, when the flyweights 18 follow their largest possible path of swivelling motion. This is, for instance, achieved when removing the collars 30, so that the bolt 25, or its stub 25b, contacts itself the inner edge 33 of the recess 3l, thereby, at the same time preventing the rotating weights 18 from abutting against the stationary housing 42.
  • the collars 30 must be exchanged. For this purpose, the
  • bracket 48 By means of a special tool, such as for example pliers, which on the one hand grips the bracket 48, and on the other hand engages a recess 28a (see FIG. 2) of the levershaped member 28, springs 45 are compressed and the 'bracket 48 is moved so close to the abutment 46 that the bridge 51 is disengaged from the annular groove 52 at the stub 15a of pin 15, and the driving flange 13 can be drawn off, whereby the collars 30 become accessible.
  • a special tool such as for example pliers, which on the one hand grips the bracket 48, and on the other hand engages a recess 28a (see FIG. 2) of the levershaped member 28, springs 45 are compressed and the 'bracket 48 is moved so close to the abutment 46 that the bridge 51 is disengaged from the annular groove 52 at the stub 15a of pin 15, and the driving flange 13 can be drawn off, whereby the collars 30 become accessible.
  • the pressure springs 45 Due to the above-described shape of driving ange 13, the pressure springs 45 also become accessible, so that they can be exchanged, if necessary, against others having a different compressibility, whenever this should be desired in order to change the timing characteristics.
  • the'washers 54 underlying the ends of the pressure springs 45 can be exchanged in this same operation, in order to change the initial tension of the pressure springs, and consequently the rpm, at which the timing device begins its adjusting operation.
  • bracket 48 the abovedescribed exchanges of elements in the timing device according to the invention are greatly facilitated as they can be carried out without disassembling entirely or partly the camshaft 10 of the injection pump 1 1, thus affording a significant saving in time and expenses.
  • a surface 18b of the one flyweight 18 serves as a stop for the free end position 18a of the other flyweight 18.
  • a centrifugal injection timing control device for use with a fuel injection pump in a diesel engine, which device comprises a. at least one flyweight which swivels against the force of at least one compressible return spring and which changes by its swivelling movements and in dependence on the rpm of the engine, the mutual rotary position of two coaxially arranged shafts, one of which is a camshaft and serves as the driven shaft, and the other of which serves as the driving shaft, the flyweight being supported on a bolt which is connected tothe driving shaft and which defines an axis parallel to the axis of the driving shaft; b. first abutment means for said return spring, associated with said driven shaft, and c.
  • second abutment means for said return spring being supported articulatedly on a stub of said bolt, which stub protrudes in axial direction from said flyweight on said bolt; and wherein the rpm-dependent characteristic of the relative rotary positions of said two shafts expressed by an adjustment angle is controllable from a cam track provided on a lever-shapecl motion-transmitting member being rigidly connected to said camshaft for movement with the latter,
  • the improvement comprising, as said second abutment means, a bracket having on its side facing away from said return spring a recess having a bearing face of U-shaped cross section, and means for securing said bracket on said stub against displacement in the axial direction.
  • bracket comprises a bridge extending in said recess across the bottom part of said bearing face of U-shaped cross section, andsaid stub has an annular groove engaged by said bridge.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Fuel-Injection Apparatus (AREA)
US00376186A 1972-07-27 1973-07-03 Centrifugal injection timing control device for fuel injection pumps in diesel engines Expired - Lifetime US3834184A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2236832A DE2236832B2 (de) 1972-07-27 1972-07-27 Fliehkraftversteller zur Änderung des Einspritzzeitpunktes bei Kraftstoffeinspritzpumpen für Dieselmotoren

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US3834184A true US3834184A (en) 1974-09-10

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US00376186A Expired - Lifetime US3834184A (en) 1972-07-27 1973-07-03 Centrifugal injection timing control device for fuel injection pumps in diesel engines

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US (1) US3834184A (US20100170793A1-20100708-C00006.png)
JP (1) JPS4945224A (US20100170793A1-20100708-C00006.png)
AT (1) AT326419B (US20100170793A1-20100708-C00006.png)
DE (1) DE2236832B2 (US20100170793A1-20100708-C00006.png)
FR (1) FR2194882B1 (US20100170793A1-20100708-C00006.png)
GB (1) GB1441415A (US20100170793A1-20100708-C00006.png)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877252A (en) * 1974-04-29 1975-04-15 Saburo Kobayashi Centrifugal torque converter
US3942492A (en) * 1974-02-15 1976-03-09 Hitachi, Ltd. Centrifugal ignition advancer device for an ignition system of an internal combustion engine
US3951118A (en) * 1974-12-19 1976-04-20 Caterpillar Tractor Co. Engine timing device
DE2725414A1 (de) * 1977-06-04 1978-12-14 Bosch Gmbh Robert Fliehkraftversteller, insbesondere zur aenderung des zuend- bzw. einspritzzeitpunktes bei brennkraftmaschinen
US4250859A (en) * 1977-06-16 1981-02-17 Daimler-Benz Aktiengesellschaft Adjusting mechanism for the rotational speed-dependent control of the injection instant of an injection pump of internal combustion engines

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5196783A (en) * 1975-02-24 1976-08-25 Jukikasankabutsuno kyujokahoho
JPS58101231A (ja) * 1981-12-11 1983-06-16 Nippon Denso Co Ltd 内燃機関用燃料噴射時期調整装置
JPS59176424A (ja) * 1983-03-26 1984-10-05 Nippon Denso Co Ltd 内燃機関用燃料噴射時期調整装置
US5030657A (en) * 1989-10-23 1991-07-09 University Of Georgia Research Foundation, Inc. L-carnitine supplemented catfish diet
DE4120496A1 (de) * 1991-06-21 1992-12-24 Kloeckner Humboldt Deutz Ag Verstellvorrichtung
NZ575156A (en) 2006-10-04 2011-03-31 Ajinomoto Kk Feed additive composition for ruminants and method of producing the same
JP5267553B2 (ja) 2008-04-03 2013-08-21 味の素株式会社 反芻動物用飼料添加組成物及びその製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589496A (en) * 1949-12-27 1952-03-18 Kloeckner Humboldt Deutz Ag Centrifugal regulator for automatically controlling the action moment of apparatus of variable rotating speed
US2722813A (en) * 1952-02-09 1955-11-08 Bosch Gmbh Robert Automatic phase alteration couplings for shafts
US2743593A (en) * 1952-05-23 1956-05-01 Bosch Arma Corp Hydraulic automatic timer
US3654776A (en) * 1970-06-11 1972-04-11 Diesel Kiki Co Centrifugal-type injection timing adjusting device for internal combustion engines
US3791171A (en) * 1971-07-14 1974-02-12 Bosch Gmbh Robert Centrifugal governor particularly for altering the moment of injection start in diesel engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE646653A (US20100170793A1-20100708-C00006.png) * 1964-04-16 1964-08-17

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589496A (en) * 1949-12-27 1952-03-18 Kloeckner Humboldt Deutz Ag Centrifugal regulator for automatically controlling the action moment of apparatus of variable rotating speed
US2722813A (en) * 1952-02-09 1955-11-08 Bosch Gmbh Robert Automatic phase alteration couplings for shafts
US2743593A (en) * 1952-05-23 1956-05-01 Bosch Arma Corp Hydraulic automatic timer
US3654776A (en) * 1970-06-11 1972-04-11 Diesel Kiki Co Centrifugal-type injection timing adjusting device for internal combustion engines
US3791171A (en) * 1971-07-14 1974-02-12 Bosch Gmbh Robert Centrifugal governor particularly for altering the moment of injection start in diesel engines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942492A (en) * 1974-02-15 1976-03-09 Hitachi, Ltd. Centrifugal ignition advancer device for an ignition system of an internal combustion engine
US3877252A (en) * 1974-04-29 1975-04-15 Saburo Kobayashi Centrifugal torque converter
US3951118A (en) * 1974-12-19 1976-04-20 Caterpillar Tractor Co. Engine timing device
DE2725414A1 (de) * 1977-06-04 1978-12-14 Bosch Gmbh Robert Fliehkraftversteller, insbesondere zur aenderung des zuend- bzw. einspritzzeitpunktes bei brennkraftmaschinen
US4227498A (en) * 1977-06-04 1980-10-14 Robert Bosch Gmbh Centrifugal governor, particularly applicable for the alteration of ignition or injection timing in internal combustion engines
US4250859A (en) * 1977-06-16 1981-02-17 Daimler-Benz Aktiengesellschaft Adjusting mechanism for the rotational speed-dependent control of the injection instant of an injection pump of internal combustion engines

Also Published As

Publication number Publication date
DE2236832C3 (US20100170793A1-20100708-C00006.png) 1979-01-18
GB1441415A (en) 1976-06-30
ATA654773A (de) 1975-02-15
JPS4945224A (US20100170793A1-20100708-C00006.png) 1974-04-30
DE2236832A1 (de) 1974-02-07
FR2194882B1 (US20100170793A1-20100708-C00006.png) 1976-09-17
AT326419B (de) 1975-12-10
DE2236832B2 (de) 1978-05-24
FR2194882A1 (US20100170793A1-20100708-C00006.png) 1974-03-01

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