EP1770261B1 - Fuel injection pump control linkage. - Google Patents

Fuel injection pump control linkage. Download PDF

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Publication number
EP1770261B1
EP1770261B1 EP06121455A EP06121455A EP1770261B1 EP 1770261 B1 EP1770261 B1 EP 1770261B1 EP 06121455 A EP06121455 A EP 06121455A EP 06121455 A EP06121455 A EP 06121455A EP 1770261 B1 EP1770261 B1 EP 1770261B1
Authority
EP
European Patent Office
Prior art keywords
operating lever
fuel injection
injection pump
control linkage
arm
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.)
Not-in-force
Application number
EP06121455A
Other languages
German (de)
French (fr)
Other versions
EP1770261A1 (en
Inventor
Frances Raphael Gressani
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.)
CNH UK Ltd
Original Assignee
CNH UK 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 CNH UK Ltd filed Critical CNH UK Ltd
Publication of EP1770261A1 publication Critical patent/EP1770261A1/en
Application granted granted Critical
Publication of EP1770261B1 publication Critical patent/EP1770261B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • 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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements

Definitions

  • the present invention relates to a fuel injection pump and is particularly concerned with the design of an operating lever used to control the fuel injection pump.
  • Fuel injection pumps of a diesel engine are controlled by rotating a spindle.
  • An operating lever mounted on the control spindle is connected to a mechanical control linkage, such as a Bowden cable, to enable the pump to be controlled remotely by the operator of the vehicle or construction machine.
  • the control linkage When the injection pump is installed in a tractor, the control linkage enters the engine compartment from the rear and requires an inboard configuration of the operating lever, that is to say the operating lever should point towards the side of the pump that is mounted on the engine. On the other hand, when the injection pump is installed in a construction machine, the control linkage comes into the engine compartment from the front and the operating lever needs to point towards the outboard side of the pump.
  • DE 34 02 934 discloses a mechanism for interrupting the fuel supply to selected cylinders of an engine.
  • the mechanism includes a spindle carrying gear pinions driving other pinions on the spindles of fuel injection pumps.
  • On the end of the spindle is an arm with a spring attached, rotated by a double arm connected on a first end by a lever to a centrifugal governor.
  • the other end of the double arm is connected by a hinge pin to a sliding lever attached to a piston operated by oil pressure.
  • the invention therefore seeks to provide a fuel injection pump that will accept a control linkage entering the engine compartment from either end without the need for adaptation during assembly.
  • a fuel injection pump having a control spindle and an operating lever for rotating the control spindle, the operating lever being a two armed lever having a connector on each of its two arms for enabling a control linkage to be connected to the operating lever, characterised in that the control linkage is connected to the first arm of the operating lever when the control linkage enters an engine compartment from a first end, and the control linkage is connected to the second arm of the operating lever when the control linkage enters the engine compartment from a second end.
  • the control linkage is preferably a Bowden cable having an inner cable connected to one of the arms of the throttle lever and an outer sheath.
  • a single fixed abutment is provided on the body of the fuel injection pump to limit movement of the end of the outer sheath of the Bowden cable when the inner cable is connected to one of the two arms of the operating lever.
  • a second stop for the outer sheath may be releasably secured to the fuel injection pump when the inner cable of the Bowden cable is to be connected to the other arm of the operating lever.
  • FIG. 1 shows a known form of fuel injection pump which is generally designated 10.
  • the internal workings of the fuel injection pump 10 are immaterial for the purposes of the present invention and they will not therefore be described.
  • the fuel injection pump receive diesel fuel under low pressure and compresses it for injection into the cylinders of the engine.
  • the quantity of fuel injected during each operating cycle of the engine is adjustable by rotating a spindle 12 which is connected to an operating lever 14.
  • the power generated by a diesel engine is determined by the injected quantity of fuel and the lever 14 therefore performs a function analogous to that of an intake throttle in a spark ignition engine.
  • the fuel injection pump is bolted onto the side of an engine, and the side of the pump shown in the drawing is the outboard side that is to say the side facing away from the engine.
  • the lever 14 has a single arm which may be oriented to point either towards the outboard side of the pump or towards the inboard side. If the lever is to be operated by a Bowden cable that reaches the pump from the right-hand side of the drawing, as viewed, then the arm of the operating lever would point towards the outboard side of the pump.
  • the outer sheath of the cable is engaged by an adjustable stop 16 while the inner cable passes through the adjustable stop 16 and is connected to a nipple on the operating lever 14.
  • a lever oriented in this manner would however be unsuitable in the case where the cable approaches the fuel injection pump from the left, as viewed. For such a situation, an inboard pointing lever is required.
  • the operating lever 14 is formed with two arms which in Figure 1 are labelled as an inboard arm and outboard arm, respectively.
  • the operating lever is shown on its own more clearly in Figure 2 in which the inboard arm is designated 14a and outboard arm 14b.
  • a non-circular hole 14c engages the spindle 12 and nipples 14d and 14e are provided on both arms of the operating lever, each capable of connection to the inner cable of a Bowden cable.
  • the stop 16 is used as an adjustable abutment for the outer sheath of the cable. It would be possible to form a second such stop permanently on the body of the injection pump but in the illustrated embodiment a bracket 18 is bolted onto the body of the fuel injection pump to receive within a slot 20 and adjustable stop for the outer sheath of the cable.
  • a spring 22 acts on an upturned flange 14f of the operating lever to bias the spindle 12 into the idling position while a downturned flange 14g serves as a stop to limit the range of movement of the operating lever 14.
  • the operating lever 14 of the invention allows the same pump to be used without modification regardless of the positioning of the engine within the vehicle and thereby avoids the need to stock separate items or to have to modify the pump during the course of its installation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)

Abstract

A fuel injection pump 10 is described having a control spindle 12 and an operating lever 14 for rotating the control spindle 12. The operating lever 14 is a two armed lever having a connector 14d, 14e on each of its two arms 14a, 14b for enabling a control linkage to be connected to the operating lever 14.

Description

  • The present invention relates to a fuel injection pump and is particularly concerned with the design of an operating lever used to control the fuel injection pump.
  • Fuel injection pumps of a diesel engine, as used in agricultural vehicles and construction machines, are controlled by rotating a spindle. An operating lever mounted on the control spindle is connected to a mechanical control linkage, such as a Bowden cable, to enable the pump to be controlled remotely by the operator of the vehicle or construction machine.
  • When the injection pump is installed in a tractor, the control linkage enters the engine compartment from the rear and requires an inboard configuration of the operating lever, that is to say the operating lever should point towards the side of the pump that is mounted on the engine. On the other hand, when the injection pump is installed in a construction machine, the control linkage comes into the engine compartment from the front and the operating lever needs to point towards the outboard side of the pump.
  • If a pump is manufactured with different variants (inboard and outboard configurations of the operating lever), the documentation and workshop manuals are complicated by the need to allow for both variants and it becomes necessary for the vehicle manufacturer to stock and store two separate items with different part numbers.
  • An alternative solution would be to provide a reversible operating lever but this requires additional work to be carried out at the assembly stage to reverse the orientation of the operating lever when necessary.
  • DE 34 02 934 discloses a mechanism for interrupting the fuel supply to selected cylinders of an engine. The mechanism includes a spindle carrying gear pinions driving other pinions on the spindles of fuel injection pumps. On the end of the spindle is an arm with a spring attached, rotated by a double arm connected on a first end by a lever to a centrifugal governor.
    The other end of the double arm is connected by a hinge pin to a sliding lever attached to a piston operated by oil pressure.
  • The invention therefore seeks to provide a fuel injection pump that will accept a control linkage entering the engine compartment from either end without the need for adaptation during assembly.
  • According to the present invention, there is provided a fuel injection pump having a control spindle and an operating lever for rotating the control spindle, the operating lever being a two armed lever having a connector on each of its two arms for enabling a control linkage to be connected to the operating lever, characterised in that the control linkage is connected to the first arm of the operating lever when the control linkage enters an engine compartment from a first end, and the control linkage is connected to the second arm of the operating lever when the control linkage enters the engine compartment from a second end.
  • The control linkage is preferably a Bowden cable having an inner cable connected to one of the arms of the throttle lever and an outer sheath.
  • When using a Bowden cable, it is necessary to provide a stop for the outer sheath of the cable. The outer sheath stop will often incorporate an adjustment screw to take up free play in the cable.
  • In the preferred embodiment of the invention, a single fixed abutment is provided on the body of the fuel injection pump to limit movement of the end of the outer sheath of the Bowden cable when the inner cable is connected to one of the two arms of the operating lever. A second stop for the outer sheath, may be releasably secured to the fuel injection pump when the inner cable of the Bowden cable is to be connected to the other arm of the operating lever.
  • The invention will now be described further, by way of example, with reference to the accompanying drawing, in which :
    • Figure 1 is a perspective view of a fuel injection pump of the invention, and
    • Figure 2 is a perspective view of the operating lever of the fuel injection pump shown in Figure 1.
  • Figure 1 shows a known form of fuel injection pump which is generally designated 10. The internal workings of the fuel injection pump 10 are immaterial for the purposes of the present invention and they will not therefore be described. The fuel injection pump receive diesel fuel under low pressure and compresses it for injection into the cylinders of the engine. The quantity of fuel injected during each operating cycle of the engine is adjustable by rotating a spindle 12 which is connected to an operating lever 14. The power generated by a diesel engine is determined by the injected quantity of fuel and the lever 14 therefore performs a function analogous to that of an intake throttle in a spark ignition engine.
  • In use, the fuel injection pump is bolted onto the side of an engine, and the side of the pump shown in the drawing is the outboard side that is to say the side facing away from the engine.
  • Conventionally, the lever 14 has a single arm which may be oriented to point either towards the outboard side of the pump or towards the inboard side. If the lever is to be operated by a Bowden cable that reaches the pump from the right-hand side of the drawing, as viewed, then the arm of the operating lever would point towards the outboard side of the pump. The outer sheath of the cable is engaged by an adjustable stop 16 while the inner cable passes through the adjustable stop 16 and is connected to a nipple on the operating lever 14. A lever oriented in this manner would however be unsuitable in the case where the cable approaches the fuel injection pump from the left, as viewed. For such a situation, an inboard pointing lever is required.
  • Hitherto, it has been proposed either to make the fuel injection pump with two different variants or to provide an operating lever that is reversible. Both these solutions present problems as has already been mentioned above.
  • In the present invention, the operating lever 14 is formed with two arms which in Figure 1 are labelled as an inboard arm and outboard arm, respectively. The operating lever is shown on its own more clearly in Figure 2 in which the inboard arm is designated 14a and outboard arm 14b. A non-circular hole 14c engages the spindle 12 and nipples 14d and 14e are provided on both arms of the operating lever, each capable of connection to the inner cable of a Bowden cable.
  • If the Bowden cable enters the engine compartment from the right-hand side, as viewed in figure 1, then the stop 16 is used as an adjustable abutment for the outer sheath of the cable. It would be possible to form a second such stop permanently on the body of the injection pump but in the illustrated embodiment a bracket 18 is bolted onto the body of the fuel injection pump to receive within a slot 20 and adjustable stop for the outer sheath of the cable.
  • A spring 22 acts on an upturned flange 14f of the operating lever to bias the spindle 12 into the idling position while a downturned flange 14g serves as a stop to limit the range of movement of the operating lever 14.
  • By virtue of its double ended configuration, the operating lever 14 of the invention allows the same pump to be used without modification regardless of the positioning of the engine within the vehicle and thereby avoids the need to stock separate items or to have to modify the pump during the course of its installation.
  • Although it is most common to use a Bowden cable as the control linkage connected to one of the arms of the operating lever 14, it will be appreciated by the person skilled in the art that it is alternatively possible to use rigid control rods for the same purpose.

Claims (4)

  1. A fuel injection pump (10) having a control spindle (12) and an operating lever (14) for rotating the control spindle (12), the operating lever (14) being a two armed lever having a connector (14d, 14e) on each of its two arms (14a, 14b) for enabling a control linkage to be connected to the operating lever (14), characterised in that the control linkage is connected to the first arm (14a) of the operating lever (14) when the control linkage enters an engine compartment from a first end, and the control linkage is connected to the second arm (14b) of the operating lever (14) when the control linkage enters the engine compartment from a second end.
  2. A fuel injection pump as claimed in claim 1, wherein the control linkage is a Bowden cable having an inner cable connected to one of the arms (14a, 14b) of the operating lever (14) and an outer sheath.
  3. A fuel injection pump as claimed in claim 2, wherein at least one stop (16) is provided on the body of the fuel injection pump (10) to limit movement of the end of the outer sheath of a Bowden cable of which the inner cable is connected to one of the two arms (14a, 14b) of the operating lever (14).
  4. A fuel injection pump as claimed in claim 3, wherein a single stop (16) is provided on the body of the fuel injection pump (10) for use when a Bowden cable is attached to a first arm (14b) of the operating lever (14) and a second stop (18) is releasably secured to the fuel injection pump (10) for use when a Bowden cable is attached to the second arm (14a) of the operating lever (14).
EP06121455A 2005-10-03 2006-09-28 Fuel injection pump control linkage. Not-in-force EP1770261B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0520049.8A GB0520049D0 (en) 2005-10-03 2005-10-03 Fuel injection pump control linkage

Publications (2)

Publication Number Publication Date
EP1770261A1 EP1770261A1 (en) 2007-04-04
EP1770261B1 true EP1770261B1 (en) 2010-07-21

Family

ID=35395144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06121455A Not-in-force EP1770261B1 (en) 2005-10-03 2006-09-28 Fuel injection pump control linkage.

Country Status (4)

Country Link
EP (1) EP1770261B1 (en)
AT (1) ATE475008T1 (en)
DE (1) DE602006015579D1 (en)
GB (1) GB0520049D0 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2036587A6 (en) * 1969-03-25 1970-12-24 Sigma
DE3402934A1 (en) 1984-01-28 1985-08-08 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 7990 Friedrichshafen Device for a lever linkage
JPH0692744B2 (en) * 1985-09-10 1994-11-16 株式会社ゼクセル Governor startup increase mechanism

Also Published As

Publication number Publication date
GB0520049D0 (en) 2005-11-09
DE602006015579D1 (en) 2010-09-02
EP1770261A1 (en) 2007-04-04
ATE475008T1 (en) 2010-08-15

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