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
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
• • 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
  • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
  • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
  • F02M59/102—Mechanical drive, e.g. tappets or cams
• • 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
  • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
  • F02M2200/8015—Provisions for assembly of fuel injection apparatus in a certain orientation, e.g. markings, notches or specially shaped sleeves other than a clip

Definitions

• the invention relates to a fuel injection pump, particularly at high pressure, in the context of application related to an internal combustion engine, in particular for a motor vehicle engine.
• the injection pump comprises on the one hand a pusher including a pusher body and a roller rotatably mounted on the pusher body and adapted to cooperate with a cam integral with a rotary shaft of the motor to induce a translational movement of the pusher, on the other hand a guiding casing guiding the pusher body during the translational movement of the pusher intended to be induced by the cam.
• the invention also relates to a system, in particular an internal combustion engine or a motor vehicle, including such an injection pump.
• the cam is integral with a camshaft or a crankshaft, or any other rotary shaft intended to ensure, among other things, an actuating function of the fuel pump. injection for the strategy of implementation and control of the fuel injection necessary for the operation of the internal combustion engine.
• the guiding casing is formed by the cylinder block of the engine block or by a pump body attached to the engine block.
• the fuel to be injected may in particular be gas oil, for example for use in the field of motor vehicles.
• the pusher comprises at one end the roller, while its opposite end, in the direction in which the translational movement of the pusher back and forth, comprises elements dedicated to the pressurization of the fuel.
• the rotational speed of the roller is important and it is necessary to provide effective lubrication of the bearing disposed between the roller and its mounting axis relative to the pusher body.
• the injection pump must also include lubrication elements ensuring effective lubrication of the sliding contact between the guide housing and the pusher body and the mechanical contact between the cam and the roller.
• it must comprise locking elements in rotation of the pusher body relative to the guide housing.
• the object of the present invention is to provide an injection pump which overcomes the disadvantages listed above.
• an object of the invention is to provide a fuel injection pump which is simple and compact, while being effective and robust. This object can be achieved by means of a fuel injection pump, in particular at high pressure, for an internal combustion engine, in particular an internal combustion engine of a motor vehicle, comprising on the one hand a pusher including a pusher body and a roller.
• a guide housing guiding the pusher body during the translational movement a pusher intended to be induced by the cam, comprising a feed part of the inside of the guide casing in a lubricating fluid, said part being able to cooperate with the body of the pusher to eliminate the degree of freedom in rotation of the pusher around the axis of translation according to which the displacement in translation of the pusher is practiced.
• the piece blocks the pusher body in rotation regardless of the position occupied by the pusher during its movement in translation relative to the guide housing.
• the part may comprise a first portion locally traversing the thickness of a wall of the guide casing to ensure fluid communication of the outside of the guide casing towards the inside of the guide casing for the lubricating fluid and a second part arranged. protruding from the guiding casing inside the guiding casing and penetrating at least partially into a cavity in the pusher body.
• the cavity in the pusher body may be in the form of a groove or groove directed parallel to said translation axis.
• the first part and the second part of the part internally delimit preferably a supply duct for the lubricating fluid opening towards the outside of the guiding casing and opening, at the level of the second part of the part, towards the inside of the the cavity formed in the pusher body, for ejecting the lubricating fluid supplied by the supply conduit at least partially in the cavity formed in the pusher body.
• the cavity may be formed in an outer face for guiding the pusher body cooperating by sliding contact with an inner face for guiding the guide housing, the second part of the part being projecting with respect to the internal guiding face of the housing of guiding, so that the lubricant fluid supplied by the workpiece at least partially lubricates said internal and external guiding faces during their relative sliding.
• the cavity in the pusher body may open into a chamber in which the pusher roll is disposed.
• the injection pump may comprise feed elements making it possible to at least partially drive the lubricating fluid supplied inside the guide casing by the piece to an outer face of the roller intended to cooperate with the cam.
• the feed elements may comprise a distribution channel pierced in the pusher body, opening into the cavity provided in the pusher body and opening at a contact interface between the outer face of the roller and the pusher body.
• a system in particular an internal combustion engine or a motor vehicle, may then include such an injection pump.
• FIG. 1 is a sectional view along the sectional plane A-A of FIG. 2 of an exemplary fuel injection pump according to the invention
• FIG. 2 is a sectional view of the injection pump of Figure 1, along a cutting plane passing through the axis of translation of the pusher relative to the guide housing. Description of preferred modes of the invention
• the injection pump comprises a pusher including a pusher body 10 and a roller 1 1 rotatably mounted on the pusher body, for example by means of an axis of rotation 12.
• the roller 1 1 is adapted to cooperate with a cam (not shown) integral with a rotary shaft of the motor to induce a displacement in translation of the pusher.
• the displacement of the pusher is of the round-trip type along a translation axis marked X along which the translational movement of the pusher is practiced.
• the injection pump also comprises a guide casing 13 guiding the translation of the pusher body 10 during the displacement in translation of the pusher intended to be induced by the cam.
• the axis of rotation 12 provides a degree of freedom in rotation of the roll 1 1 with respect to the pusher body 10 oriented perpendicularly to the translation axis X.
• the invention also relates to any system including such an injection pump, this system may be in particular an internal combustion engine or a motor vehicle.
• the displacement of the pusher resulting from the application of a force by the cam on the roller 1 1 is practiced in opposition to a return force oriented along the X axis applied by a spring 14 disposed in the guide housing 13, disposed the opposite side to the roller 1 1 relative to the pusher body 10 along the axis X.
• the pusher thus comprises at a first end the roller 1 1, while its second end opposite the first end, along the translation axis X, comprises elements configured to ensure a pressure of the fuel (not shown) under the effect of displacement of the pusher.
• high pressure preferably means in this document that the injection pressure of the fuel, which may in particular be gas oil, is for example of the order of 2000 bar.
• the effort between the roll 1 1 and the cam is for example of the order of 10 KN for the case of a motor speed of 4000tr / min.
• the cam is integral with a camshaft or a crankshaft, or any other rotary shaft intended to ensure, among other things, an actuating function of the injection pump for the implementation and control strategy of the injecting the fuel necessary for the operation of the internal combustion engine.
• the fuel injection pump comprises a feed member from the interior of the guide housing 13 into a lubricating fluid.
• This part 15 is adapted to cooperate with the body of the pusher to eliminate the degree of freedom in rotation of the pusher around the translation axis X in which the translational movement of the pusher is practiced.
• the piece 15 thus simultaneously provides the function of supplying the inside of the guiding casing 13 with lubricating fluid and the blocking function of the pusher body 10 in rotation with respect to the guiding casing 13 to eliminate the degree of freedom. in rotation of the pusher around the translation axis X.
• the piece 15 may for example be in the form of a peg pierced from one side, a through cannula or any other equivalent form or at least adapted to the desired function. For attachment, it can in particular be fitted into the guide housing 13, although any other fastening means can be used.
• the part 15 has the advantage of providing the two rotational locking and lubrication functions on the pusher in an integrated manner on the guide casing 13, which can be either a cylinder block of the engine block either a pump body in the case where the pump body is separate element of the engine block.
• the piece 15 blocks the pusher body 10 in rotation regardless of the position occupied by the pusher during its movement in translation relative to the guide housing 13. This allows to mount and simplify the mounting of the pusher body 10 relative to the guide housing 13, only providing the part 15 for the rotational locking function.
• the part 15 may comprise a first part locally traversing the thickness of a wall of the guide casing 13 to ensure fluid communication of the outside of the guide casing towards the inside of the guide casing for the lubricating fluid and a second a portion protruding from the guide casing 13 inside the guide casing 13 and penetrating at least partially into a cavity 16 formed in the pusher body 10.
• the part 15 may also comprise a third portion disposed outside the guiding casing 13, especially in the extension of the first and second parts.
• the first and second parts of the part 15 are offset relative to each other in a direction substantially or exactly perpendicular to the translation axis X, allowing an efficient supply of lubricating fluid from the inside of the guiding casing .
• the cavity 16 makes it possible to form a lubrication gallery both for the sliding contact between the guiding casing 13 and the pusher body 10 and for the mechanical contact between the cam and the roller 11.
• the cavity 16 formed in the pusher body 10 is in particular in the form of a groove or directed groove parallel to said translation axis X.
• the cavity 16 may take any other form.
• the first part and the second part mentioned above of the part 15 internally delimit a supply duct 17 for the lubricating fluid opening towards the outside of the guiding casing 13 and opening, at the level of the second part of the part 15, towards the inside of the cavity 16 formed in the pusher body 10.
• the supply marked F of the supply duct 17 with lubricant fluid outside the guiding casing 13 can be obtained by any means and provides no application limitation.
• the cavity 16 may be formed in an outer face for guiding the pusher body 10 cooperating by sliding contact with an inner face for guiding the guide casing 13, the second part of the part 15 projecting from the inner face of the guiding the guide casing 13, so that the lubricating fluid supplied by the part 15 at least partially lubricates these internal and external guiding faces during their relative sliding. This makes it possible to confer a lubrication function on the sliding contact zone between the pusher body 10 and the guide casing 13.
• the cavity 16 formed in the pusher body 10 can also open into a chamber 18 in which the roller 1 1 of the pusher is arranged, in order to facilitate the distribution of lubricant fluid to the contact zone between the cam and the roller January 1.
• the injection pump also comprises feed elements making it possible to at least partially drive the lubricant fluid supplied inside the guiding casing 13 by the component 15 to an outer face of the roller 1 1 designed to cooperate with the cam.
• the feed elements may comprise a single distribution channel 19 pierced in the pusher body 10 so as to open on one side into the cavity 16 formed in the pusher body 10 and on the other side at a contact interface between the outer face of the roller 1 1 and the pusher body 10. This contributes to the distribution of lubricant fluid to the contact area between the cam and the roller 1 1.
• the injection pump thus has the advantage of being simple, compact, efficient and robust.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=50933404

Family Applications (1)

Country Status (3)

Cited By (2)

Citations (11)

Family Cites Families (1)

• 2014
  • 2014-04-18 FR FR1453549A patent/FR3020095B1/fr active Active
• 2015
  • 2015-04-09 WO PCT/FR2015/050944 patent/WO2015158994A1/fr active Application Filing
  • 2015-04-09 EP EP15725722.1A patent/EP3132134A1/de not_active Withdrawn

Patent Citations (11)

Non-Patent Citations (1)

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