EP3064758B1 - Hochdruckdieselkraftstoffpumpen und schlittenanordnung - Google Patents

Hochdruckdieselkraftstoffpumpen und schlittenanordnung Download PDF

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Publication number
EP3064758B1
EP3064758B1 EP16153707.1A EP16153707A EP3064758B1 EP 3064758 B1 EP3064758 B1 EP 3064758B1 EP 16153707 A EP16153707 A EP 16153707A EP 3064758 B1 EP3064758 B1 EP 3064758B1
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EP
European Patent Office
Prior art keywords
plunger
shoe
engaging surface
engaging
roller
Prior art date
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Active
Application number
EP16153707.1A
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English (en)
French (fr)
Other versions
EP3064758A1 (de
Inventor
Steven Richard Smith
Laurence Samuel MCLAUCHLAN
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Delphi International Operations Luxembourg SARL
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Delphi International Operations Luxembourg SARL
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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
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0408—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0413—Cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam

Definitions

  • the present invention relates generally to the field of high pressure diesel fuel pumps. More particularly, but not exclusively, the present invention concerns shoe arrangements for high pressure diesel fuel pumps.
  • Known high pressure diesel fuel pumps comprise one or more plungers movable within plunger bores, to pressurise fuel within respective pumping chambers, for delivery to a fuel injection system of an engine.
  • Each plunger is reciprocally movable along a pumping axis by a cam arrangement (driven by a drive shaft) to perform a fuel-pressurising pumping stroke and a plunger return spring to effect a plunger return stroke as described in JP H09 228923 A .
  • each of the plungers may be coupled to a cylindrical tappet member which serves to drive movement of the associated plunger within its bore.
  • these arrangements can be difficult to assemble, require a relatively large accommodation space and are relatively expensive.
  • An alternative to the tappet arrangement comprises a roller and shoe arrangement (a cam follower or "roller-shoe” drive arrangement), in which a shoe is arranged to contact a plunger and a roller is co-operable with the shoe and the cam surface of the cam arrangement so as to impart reciprocal movement to the shoe upon rotation of the drive shaft.
  • a roller and shoe arrangement a cam follower or "roller-shoe” drive arrangement
  • Shoes are subjected to high forces in the pumping cycle and as such, need to be able to resist the stresses.
  • Known shoe designs comprise a single component comprising a suitable metal, typically steel.
  • a suitable metal typically steel.
  • the roller and the cam components also need to be capable of withstanding and resisting said vibrations which may otherwise cause unacceptable wear and malfunction of the drive assembly. Accordingly, the known shoe designs and materials have a significant impact on the mechanical properties of the materials which can then be used for at least the roller, which are often high-cost materials.
  • Adding materials to the shoe also increases size of the shoe. Restrictions on component size are a high priority in fuel pumps where packing spaces are crowded, which means that any increase in size is generally considered to be disadvantageous. Furthermore, an increase in size of the shoe increases the mass of the shoe, which in turn increases dynamic stresses on the driveshaft and the plunger return spring.
  • a high pressure diesel fuel pump comprising a pumping assembly and a drivetrain assembly, the pumping assembly comprising a pump housing and a plunger mounted along a pumping axis, the drivetrain assembly comprising a drive shaft and a cam arrangement having a cam and a cam follower mounted within a drivetrain housing, the cam follower comprising a shoe and a roller, the plunger being driven in reciprocating linear movement along the pumping axis upon rotation of the cam arrangement, wherein the shoe comprises at least one vibration damping layer disposed below a plunger-engaging surface.
  • .By 'vibration damping layer' what is meant is a layer capable of damping vibration/ having energy dissipation properties under cyclic stress.
  • the vibration damping layer(s) does/ do not form the plunger-engaging surface, but is(are) disposed below the plunger-engaging surface.
  • the shoe comprises a body extending between the plunger-engaging surface and a roller-engaging surface.
  • the roller-engaging surface forms a cavity in a lower portion of said body to receive and retain said roller.
  • the damping layer(s) comprise(s) a resin.
  • the resin preferably comprises a thermosetting polymer.
  • the polymer comprises one or more of a phenolic resin, and epoxy resin and a polyester resin.
  • the damping layer(s) comprise(s) a reinforced resin.
  • the resin may be reinforced with fibres.
  • the fibres may comprise one or more of cellulose fibres (such as paper or cotton), glass fibres and carbon fibres.
  • the damping layer(s) comprise(s) a laminate of one or more fibre layers and one or more resin layers.
  • the damping layer(s) may comprise(s) a laminate of cotton sheets and phenolic chemical resin layers, e.g. Tufnol ®.
  • the damping layer(s) may comprise(s) a thickness or depth of approximately up to 50% of a depth of the shoe (as measured from said plunger-engaging surface to the roller-engaging surface).
  • the damping layer(s) comprise(s) a thickness or depth of approximately from 1% to approximately 15% of a depth of the shoe (from said plunger-engaging surface to the roller-engaging surface).
  • the damping layer(s) comprise(s) a thickness or depth of approximately from 1 % to approximately 10% of a depth of the shoe. Most preferably, approximately 4% of a depth of the shoe.
  • the damping layer(s) is(are) disposed below a plunger-engaging layer.
  • the damping layer(s) is(are) disposed between the plunger-engaging layer and the roller-engaging surface.
  • the damping layer(s) is(are) disposed at least partially above the cavity.
  • One or more damping layer(s) may partially surround the cavity, but most preferably, at least one damping layer is disposed above the cavity.
  • the damping layer(s) is(are) preferably disposed within an upper half (plunger-engaging half) of the shoe. More preferably, the damping layer(s) is(are) disposed within an upper 25% of the shoe, most preferably within an upper 15% of the shoe.
  • the damping layer(s) extends across substantially the whole of the body, e.g. between side walls of the body.
  • the shoe comprises a single damping layer, although multiple separate layers may be provided disposed throughout the body.
  • the plunger-engaging layer comprises load distribution characteristics.
  • the plunger-engaging layer comprises a stiff material.
  • the plunger-engaging layer preferably comprises a suitable metal, such as steel.
  • the plunger-engaging layer comprises a thickness or depth of approximately from 1% to approximately 25% of the depth of the shoe (from said plunger-engaging surface to the roller-engaging surface). More preferably, the plunger-engaging layer comprises a thickness or depth of approximately from 1% to approximately 15% of the depth of the shoe, most preferably, approximately 5-10% of the depth of the shoe.
  • the plunger-engaging layer is disposed close to the plunger-engaging surface, and most preferably forms said plunger-engaging surface.
  • the plunger-engaging layer extends across substantially the whole of the body, e.g. between side walls of the body.
  • the shoe body may comprise any suitable material. Therefore, the shoe body may comprise any suitable metal, such as steel.
  • the damping layer(s) may, or may not be bonded to the plunger-engaging layer and/or the remaining body of the shoe.
  • the damping layer(s) may be adhered to the plunger-engaging layer and/or the remaining body of the shoe using a suitable adhesive, for example, an acrylic adhesive, polyurethane adhesive, an epoxy adhesive or other contact adhesive.
  • a suitable adhesive for example, an acrylic adhesive, polyurethane adhesive, an epoxy adhesive or other contact adhesive.
  • the damping layer(s) are unbonded to the plunger-engaging layer and/or the remaining body of the shoe.
  • the roller may comprise any suitable material. Therefore, the roller may comprise a suitable metal, such as steel, or a ceramic.
  • an improved shoe for a cam follower of a high pressure diesel fuel pump comprising a plunger-engaging surface and a roller-engaging surface, wherein the shoe comprises at least one vibration damping layer disposed below the plunger-engaging surface.
  • Figure 1 shows a high pressure diesel fuel pump (not shown) comprising a pumping assembly and a drivetrain assembly, the pumping assembly comprising a pump housing (not shown) and a plunger 10 mounted along a pumping axis A-A', the drivetrain assembly comprising a drive shaft (not shown) and a cam arrangement 20 having a cam 22 and a cam follower 23 mounted within a drivetrain housing (not shown), the cam follower 23 comprising a shoe 25 and a roller 24, the plunger 10 being driven in reciprocating linear movement along the pumping axis A-A' upon rotation of the cam arrangement 20, wherein the shoe 25 comprises at least one vibration damping layer 31 disposed below a plunger-engaging surface 27.
  • the shoe 25 comprises a body 26 having the plunger-engaging surface 27 and a roller-engaging surface 29.
  • the vibration damping layer 31 of the shoe 25 comprises a material capable of damping vibration as the shoe 25 is subjected to cyclic stress by the plunger 10. Accordingly, the damping layer 31 comprises a suitable resin and in a preferred embodiment, comprises a resin reinforced with one or more fibre types.
  • the damping layer 31 comprises a resin comprising one or more of the following: a phenolic resin, an epoxy resin or a polyester resin, reinforced with one or more of the following: cellulose fibres (e.g. paper or cotton), glass fibres or carbon fibres.
  • a laminate of fibre sheets and resin layers is anticipated to provide a good option.
  • sheet Tufnol ® is used, which is a laminate of cotton fibre sheets and phenolic chemical resin layers.
  • the damping layer 31 comprises a thickness or depth that is relative to a depth of the shoe body 26.
  • the damping layer 31 comprises a depth of approximately 1-15% of the depth of the shoe body 26.
  • the damping layer 31 may comprise up to 50% of the depth of the body 26 in order to have a vibration damping effect.
  • the damping layer 31 is disposed within an upper 15% of the shoe body 26 measured from the plunger-engaging surface 27.
  • the damping layer 31 may be disposed at any location above, and/or around the roller-engaging surface 29 to have a vibration damping effect.
  • the vibration damping layer 31 is disposed below a plunger-engaging layer 28.
  • the plunger-engaging layer 28 forms the plunger-engaging surface 27 of the shoe body 26.
  • the plunger-engaging layer 28 of the shoe 25 comprises a stiff material capable of imparting load distribution across the body 26. Accordingly, the plunger-engaging layer 28 comprises a suitable material and in a preferred embodiment, comprises a suitably stiff material, for example a suitable metal, such as steel.
  • the plunger-engaging layer 28 comprises a thickness or depth that is relative to a depth of the shoe body 26.
  • the plunger-engaging layer 28 comprises a depth of approximately 1-15% of the depth of the shoe body 26.
  • the damping layer 31 may comprise up to 25% of the depth of the body 26 in order to have an acceptable load distribution effect.
  • the shoe body 26 comprises a suitable metal, such steel.
  • the roller-engaging surface 29 comprises a profiled surface 29a forming a cavity 30 to receive and compliment the roller 24 disposed therein.
  • the plunger-engaging layer 28 and the damping layer 31 cooperate to (a) distribute the load across the body 26 of the shoe 25 and (b) dissipate vibrations within the shoe body 26. This is turn minimises the distortion of the shoe body 26 and the effects of the vibrations on the roller 24.
  • the roller 24 need not be formed from a material that imparts as much resilience or ductility as has been previously required with prior art shoes.
  • the roller 24 may be made from a wider range of materials since the vibration damping characteristics of the improved shoe 25 is more tolerant with otherwise harder or more brittle materials, such as ceramics.
  • the construction of the shoe 25 is a sandwich of one or more damping layers 31 between body 26 layers and topped with the plunger-engaging layer 28.
  • the damping layer(s) can be bonded to the plunger-engaging layer 28 and/or the remaining body 28 of the shoe 25, although it is to be appreciated that due to the tight clearance distances between a shoe 25 and a shoe guide (not shown) in the drive housing (not shown), there would be little lateral movement of the components if they were to remain unbonded. Furthermore, due to the downward action of the plunger spring (not shown), the various components would unlikely be found to dissemble in the housing.
  • the damping layer(s) 31 may be adhered to the plunger-engaging layer 28 and/or the remaining body 26 of the shoe 25 using a suitable adhesive, for example, an acrylic adhesive, polyurethane adhesive, an epoxy adhesive or other contact adhesive.

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

Claims (11)

  1. Hochdruck-Dieselkraftstoffpumpe mit einer Pumpanordnung und einer Antriebsstranganordnung, wobei die Pumpanordnung ein Pumpengehäuse und einen Kolben (10) aufweist, der entlang einer Pumpachse (A-A') angebracht ist, wobei die Antriebsstranganordnung eine Antriebswelle und eine Nockenanordnung (20) mit einem Nocken (22) und einem Nockenfolger (23), in einem Antriebsstranggehäuse angebracht, aufweist, wobei der Nockenfolger (23) einen Schuh (25) und eine Rolle (24) aufweist, wobei der Kolben (10) in einer linearen Hin- und Herbewegung entlang der Pumpachse A-A' bei Rotation der Nockenanordnung (20) angetrieben wird, wobei der Schuh einen Körper (26) aufweist, der sich zwischen der Kolben-Kontaktoberfläche (27) und einer Rolle-Kontaktoberfläche (29) erstreckt, und wobei eine Rolle-Kontaktoberfläche (29) einen Hohlraum (30) in dem Körper (26) bildet, um die Rolle (24) aufzunehmen und zu halten, wobei der Schuh (25) zumindest eine Vibrationsdämpfungsschicht (31) aufweist, die unter einer Kolben-Kontaktoberfläche (27) angeordnet ist,
    dadurch gekennzeichnet, dass die Dämpfungsschicht(en) (31) zwischen einer Kolben-Kontaktschicht (28) und der Rolle-Kontaktoberfläche (29) über dem Hohlraum (30) angeordnet ist/sind.
  2. Die Pumpe gemäß Anspruch 1, wobei die Dämpfungsschicht(en) (31) ein Harz aufweist/aufweisen.
  3. Die Pumpe gemäß Anspruch 2, wobei das Harz ein wärmehärtbares Polymer aufweist, das ein oder mehrere aus einem Phenolharze, einem Epoxidharz und einem Polyesterharz aufweist.
  4. Die Pumpe gemäß einem der Ansprüche 2 oder 3, wobei das Harz mit Fasern verstärkt ist, die eines oder mehrere aus Zellulosefasern, Glasfasern und Kohlenstofffasern aufweisen.
  5. Die Pumpe gemäß Anspruch 4, wobei die Dämpfungsschicht(en) (31) ein Laminat aus einer oder mehreren Faserschichten und einer oder mehreren Harzschichten aufweist/aufweisen.
  6. Die Pumpe gemäß einem der Ansprüche 1-5, wobei die Dämpfungsschicht (31) bis zu 50% der Tiefe des Körpers 26 aufweist, um einen Vibrationsdämpfungseffekt zu haben (gemessen von der Kolben-Kontaktoberfläche (27) bis zu der Rolle-Kontaktoberfläche (29)).
  7. Die Pumpe gemäß einem der Ansprüche 1-6, wobei die oder alle Dämpfungsschichten (31) in einer den Plungerkolben kontaktierenden Hälfte der Tiefe des Schuhs (25) (von der Kolben-Kontaktoberfläche (27)) angeordnet sind.
  8. Die Pumpe gemäß einem der Ansprüche 1-7, wobei die Kolben-Kontaktschicht (28) ein steifes Material aufweist, das eine Lastverteilung über den Körper 26 bewirken kann.
  9. Die Pumpe gemäß Anspruch 8, wobei die Kolben-Kontaktschicht (28) eine Dicke oder Tiefe von 1% bis 25% der Tiefe des Schuhs (25) (gemessen von der Kolben-Kontaktoberfläche (27) zu der Rolle-Kontaktoberfläche (29)) aufweist.
  10. Die Pumpe gemäß einem der Ansprüche 6-9, wobei die Kolben-Kontaktschicht (28) die Kolben-Kontaktoberfläche (27) bildet.
  11. Die Pumpe gemäß einem der Ansprüche 6-10, wobei die Dämpfungsschicht(en) (31) mit der Kolben-Kontaktschicht (28) und/oder dem verbleibenden Körper (26) des Schuhs (25) verbunden ist/sind.
EP16153707.1A 2015-03-03 2016-02-01 Hochdruckdieselkraftstoffpumpen und schlittenanordnung Active EP3064758B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201503591A GB201503591D0 (en) 2015-03-03 2015-03-03 High pressure diesel fuel pumps and shoe arrangements

Publications (2)

Publication Number Publication Date
EP3064758A1 EP3064758A1 (de) 2016-09-07
EP3064758B1 true EP3064758B1 (de) 2018-10-10

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EP16153707.1A Active EP3064758B1 (de) 2015-03-03 2016-02-01 Hochdruckdieselkraftstoffpumpen und schlittenanordnung

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EP (1) EP3064758B1 (de)
GB (1) GB201503591D0 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09228923A (ja) * 1996-02-26 1997-09-02 Isuzu Motors Ltd 列型燃料噴射ポンプのタペット
US7610902B2 (en) * 2007-09-07 2009-11-03 Gm Global Technology Operations, Inc. Low noise fuel injection pump
DE102010038468A1 (de) * 2010-07-27 2012-02-02 Robert Bosch Gmbh Hochdruckpumpe

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Publication number Publication date
GB201503591D0 (en) 2015-04-15
EP3064758A1 (de) 2016-09-07

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