EP2672116A1 - Cam follower roller device, notably for a fuel injection pump - Google Patents
Cam follower roller device, notably for a fuel injection pump Download PDFInfo
- Publication number
- EP2672116A1 EP2672116A1 EP12305653.3A EP12305653A EP2672116A1 EP 2672116 A1 EP2672116 A1 EP 2672116A1 EP 12305653 A EP12305653 A EP 12305653A EP 2672116 A1 EP2672116 A1 EP 2672116A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- coating
- roller
- coated
- diamond
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 11
- 238000002347 injection Methods 0.000 title claims abstract description 8
- 239000007924 injection Substances 0.000 title claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 80
- 239000011248 coating agent Substances 0.000 claims abstract description 76
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 39
- 229910052799 carbon Inorganic materials 0.000 claims description 39
- 229910003460 diamond Inorganic materials 0.000 claims description 36
- 239000010432 diamond Substances 0.000 claims description 36
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 239000010410 layer Substances 0.000 description 8
- 239000011229 interlayer Substances 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
-
- 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
-
- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
- F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
- F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2301/00—Using particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
- F01L2305/02—Mounting of rollers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/02—Lubrication
-
- 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
- F02M2200/02—Fuel-injection apparatus having means for reducing wear
-
- 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
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2203/00—Non-metallic inorganic materials
- F05C2203/08—Ceramics; Oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2203/00—Non-metallic inorganic materials
- F05C2203/08—Ceramics; Oxides
- F05C2203/0804—Non-oxide ceramics
- F05C2203/0808—Carbon, e.g. graphite
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2251/00—Material properties
- F05C2251/14—Self lubricating materials; Solid lubricants
Definitions
- the present invention relates to the field of mechanical cam follower roller devices for actuating a reciprocating movement used in automotive or industrial applications, such as fuel injection pumps, ICE valve timing systems, valvetrain cam followers or rocker arm bearings.
- An advantageous application of the invention is the use of the device in a fuel injection pump intended for an internal combustion engine, notably of a motor vehicle.
- Such a device generally comprises an outer sleeve or casing and a roller mounted on said casing and adapted to collaborate with a cam synchronized with the internal combustion engine camshaft so that the rotation of the camshaft leads to a periodic displacement of a piston of the pump which is in contact against the casing of the device.
- Patent application US2008/0190237 discloses such a conventional mechanical device.
- One aim of the present invention is to overcome these drawbacks.
- the cam follower roller device notably for fuel injection pump of an internal combustion engine, comprises a body, a shaft mounted on the body and a roller rotatably mounted on said shaft. At least one of the shaft and the roller is coated with an antifriction and/or wear resistance coating.
- Each of the shaft and the roller may be coated with an antifriction and/or wear resistance coating.
- at least the outer surface of the shaft and the bore of the roller are coated with an antifriction and/or wear resistance coating.
- one of the shaft and the roller is coated with a diamond like carbon coating, the other being coated with a black oxide coating.
- the shaft is coated with the diamond like carbon coating and the roller is coated with the black oxide coating.
- the thickness of the diamond like carbon coating is from 1 to 4 ⁇ m.
- the thickness of the black oxide coating may be from 0.5 to 1.5 ⁇ m, and preferably from 0.8 to 1.2 ⁇ m.
- the device comprises a bushing radially interposed between the roller and the shaft.
- the outer surface of the bushing in contact with the roller and the bore of said bushing in contact with the shaft are each coated with an antifriction and/or wear resistance coating.
- One of the outer surface and the bore of the bushing may be coated with a diamond like carbon coating, the other being coated with a black oxide coating.
- the outer surface of the bushing is coated with the diamond like carbon coating and the bore is coated with the black oxide coating.
- a first embodiment of a cam follower roller device 10 is illustrated on Figure 1 , said device may for example be used in a fuel injection pump intended for an internal combustion engine.
- the device 10 comprises an outer body or casing 12, a pin or shaft 14 extending along an axis 14a and mounted on the casing, and a roller 16 supported on the shaft and adapted to press against a cam (not shown) synchronized with the internal combustion engine camshaft or directly against a cam of the said camshaft.
- the outer casing 12 has a tubular form and may be made of stamped metal sheet.
- the ends of the shaft 14 are fixed for example by push-fitting in through-holes formed on the casing 12 and facing on another.
- the shaft 14 may be fixed to the casing by any other appropriate means.
- the roller 16 is rotatably mounted on an outer cylindrical surface 14b of the shaft 14 and has a bore 16a of cylindrical shape which comes radially into direct contact with said outer surface.
- the outer surface 14b of the shaft 14 is coated with a diamond like carbon (DLC) coating.
- the diamond like carbon coating may be a metal-mixed diamond like carbon coating comprising alternating layers of predominantly diamond like carbon but containing some metal carbide, and layers of predominantly metal carbide but containing some diamond like carbon, each of the order of 1 to 50 nanometre thickness for instance.
- the metal carbide can be in the form of clusters disposed throughout a layer of diamond like carbon.
- Such layers consist of a matrix of predominantly diamond like carbon with a dispersion of particles of metal carbide. Said particles can have clustered morphology regions of metal carbide up to 100 nm in extent.
- the clusters may be composed of carbides of one or more metals.
- the metal mixed diamond like carbon coating may be formed on a metallic interlayer of Cr, W, Mo, or A1, which is pre-deposited onto the outer surface 14b of the shaft 14.
- the diamond like carbon coating, applied to the metallic interlayer may also contain one or more metallic carbide forming elements such as W, Mo or Ti.
- W, Mo metallic carbide forming elements
- the diamond like carbon coating may be a doped diamond like carbon coating, such as a metal doped hydrogenated diamond-like carbon coating a-C:H:Me or metal doped diamond like carbon coating Me-DLC.
- a-C:H:Me the hydrogen concentration may be from 10 to 40% of hydrogen, and preferably from 20 to 30 %.
- Said coating may be doped with elements such as W or Ti.
- the concentration of the metal may be from 5 to 30%, preferably from 15 to 25%.
- the doped diamond like carbon coating may have a multilayer structure with one layer rich in metal and another layer rich in carbon.
- the thickness of each layer may be from 2 to 10 nm, and preferably from 10 to 50 nm.
- the multilayer structure increases the toughness of the coating and gives rise to reduced residual stresses in the coating and therefore enhanced adhesion. In fact, a reduced residual stresses increase the resistance of the coating to indentation damage and reduce the risk of coating cracks and delamination.
- the total thickness of the doped diamond like carbon coating may be from 1 to 4 ⁇ m.
- the hardness of said coating may be from 8 to 25 GPa, and preferably from 10 to 15GPa.
- the doped diamond like carbon coating may be formed on a metallic interlayer of W or Ti which is pre-deposited onto the outer surface of the shaft 14.
- the thickness of the metallic interlayer may be from 0.05 to 0.5 ⁇ m.
- a bond layer of W may be provided between the metallic interlayer and the doped diamond-like carbon coating.
- the bore 16a of the roller 16 in contact with the diamond like carbon coating of the shaft 14 is coated with a black oxide coating such as magnetite Fe 3 O 4 .
- the thickness of the black oxide coating may be from 0.5 to 1.5 ⁇ m, and preferably from 0.8 to 1.2 ⁇ m.
- all the surfaces of the roller 16 may be coated with the black oxide coating.
- the black oxide coating With the black oxide coating, the adhesive wear or seizure is limited during an oil-free operation even in highly loaded conditions. Such coating acts as a wear resistance coating.
- Light preservative oil can be applied on both the black oxide coating of the roller and the diamond like carbon coating of the shaft to improve the ability to work in the oil-free condition and the resistance to rust.
- the diamond like carbon coating is provided on the shaft 14 and the black oxide coating on the roller 16.
- a device 10 with a diamond like carbon coating on the roller and a black oxide coating on the shaft may be possible to have a device 10 with a diamond like carbon coating on the roller and a black oxide coating on the shaft.
- the device 10 further comprises a sleeve or bushing 18 radially disposed between the outer surface 14b of the pin 14 and the bore 16a of the roller 16.
- An outer cylindrical surface 18a of the bushing comes radially into contact with the bore 16a of the roller and a bore 18b of said bushing comes radially into contact with the outer surface 14b of the shaft.
- the bushing 18 is coated with at least an antifriction and/or wear resistance coating.
- the bushing 18 may be coated with a diamond like carbon coating or a black oxide coating as previously described.
- the outer surface 18a of the bushing 18 is coated with the diamond like carbon coating when the black oxide coating is provided on the bore 16a of the roller 16, and the bore 18b of said bushing is coated with the black oxide coating when the diamond like carbon coating is provided on the outer surface 14b of the shaft 14.
- the disposition on the bushing of the black oxide and diamond like carbon coatings is inverted.
- a third embodiment of a cam follower roller device 10 is illustrated on Figure 3 , said device being used to control a valve 22 of an internal combustion engine 24.
- the device 10 comprises a rocker body or arm 26, a pin 27 and a shaft 28 each extending along an axis 27a, 28a and being mounted on the arm, and a roller 30 supported on the shaft 28 and adapted to press against a cam 32 of the internal combustion engine camshaft so that rotation of the camshaft causes a periodic pivoting of the rocker arm in order to open and close the valve 22.
- the roller 30 is rotatably mounted on an outer cylindrical surface 28b of the shaft and has a bore 30a of cylindrical shape which comes radially into direct contact with said outer surface.
- the rocker arm 26 comprises two identical and spaced walls 26a which are assembled together to support therebetween the pin 27 and the shaft 28. One end of each wall 26a presses against a plate 34 provided on the top of the control valve 22. A spring 35 is mounted between said plate and the combustion engine 24.
- the shaft 28 is mounted at the opposite end of each wall 26a.
- the rocker arm 26 may pivot around the axis 27a of the transversal pin 27 which is parallel to the axis 28a of the shaft.
- the shaft 28 and the roller 30 are identical to those described is the first embodiment and comprise coatings as previously disclosed.
- a bushing may radially be interposed between the roller 30 and the shaft 28 as disclosed in the second embodiment.
- lubricated device since it will take a few seconds for the lubricant to reach the contact zone, in addition to the coating(s), it is advantageous to apply some lubricant on the roller and/or pin, e.g. by dipping, either before or after assembly of the device. It is particularly advantageous to apply the lubricant on the component(s) with the black oxide coating because the latter is able to retain a quantity of lubricant higher than a non-coated surface or the diamond like carbon coating.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
- The present invention relates to the field of mechanical cam follower roller devices for actuating a reciprocating movement used in automotive or industrial applications, such as fuel injection pumps, ICE valve timing systems, valvetrain cam followers or rocker arm bearings.
- An advantageous application of the invention is the use of the device in a fuel injection pump intended for an internal combustion engine, notably of a motor vehicle.
- Such a device generally comprises an outer sleeve or casing and a roller mounted on said casing and adapted to collaborate with a cam synchronized with the internal combustion engine camshaft so that the rotation of the camshaft leads to a periodic displacement of a piston of the pump which is in contact against the casing of the device. Patent application
US2008/0190237 discloses such a conventional mechanical device. - With increasing demand on fuel efficiency, the pressure of the fuel pump has raised significantly last years. With a higher fuel pump pressure, the load applied on the cam follower roller device increases as well.
- Otherwise, automotive engine manufactures are looking for an oil-free operation. This means that the use of the lubricating oil shall be limited or even avoided for the cam follower roller device. Besides, some time is necessary for the engine oil to reach the device. Accordingly, there will be a period of time without lubrication for the device.
- Currently, the conventional mechanical cam follower roller devices are not adapted to meet these two major requirements: a higher contact pressure and an increased service life under conditions where lubrication is poor or absent.
- One aim of the present invention is to overcome these drawbacks.
- It is a particular object of the present invention to provide a cam follower roller device, notably for a fuel injection pump, which has an increased service life.
- In one embodiment, the cam follower roller device, notably for fuel injection pump of an internal combustion engine, comprises a body, a shaft mounted on the body and a roller rotatably mounted on said shaft. At least one of the shaft and the roller is coated with an antifriction and/or wear resistance coating.
- Each of the shaft and the roller may be coated with an antifriction and/or wear resistance coating. Advantageously, at least the outer surface of the shaft and the bore of the roller are coated with an antifriction and/or wear resistance coating.
- In one embodiment, one of the shaft and the roller is coated with a diamond like carbon coating, the other being coated with a black oxide coating. Preferably, the shaft is coated with the diamond like carbon coating and the roller is coated with the black oxide coating.
- In one embodiment, the thickness of the diamond like carbon coating is from 1 to 4 µm. The thickness of the black oxide coating may be from 0.5 to 1.5 µm, and preferably from 0.8 to 1.2 µm.
- In one embodiment, the device comprises a bushing radially interposed between the roller and the shaft. Advantageously, the outer surface of the bushing in contact with the roller and the bore of said bushing in contact with the shaft are each coated with an antifriction and/or wear resistance coating. One of the outer surface and the bore of the bushing may be coated with a diamond like carbon coating, the other being coated with a black oxide coating. Preferably, the outer surface of the bushing is coated with the diamond like carbon coating and the bore is coated with the black oxide coating.
- The present invention and its advantages will be better understood by studying the detailed description of specific embodiments given by way of non-limiting examples and illustrated by the appended drawings on which:
-
Figures 1 and2 are sections of cam follower roller devices according to first and second examples of the invention, and -
Figure 3 is a side view of a cam follower roller device according to a third example of the invention. - A first embodiment of a cam
follower roller device 10 is illustrated onFigure 1 , said device may for example be used in a fuel injection pump intended for an internal combustion engine. - The
device 10 comprises an outer body orcasing 12, a pin orshaft 14 extending along anaxis 14a and mounted on the casing, and aroller 16 supported on the shaft and adapted to press against a cam (not shown) synchronized with the internal combustion engine camshaft or directly against a cam of the said camshaft. Theouter casing 12 has a tubular form and may be made of stamped metal sheet. - The ends of the
shaft 14 are fixed for example by push-fitting in through-holes formed on thecasing 12 and facing on another. Alternatively, theshaft 14 may be fixed to the casing by any other appropriate means. - The
roller 16 is rotatably mounted on an outercylindrical surface 14b of theshaft 14 and has abore 16a of cylindrical shape which comes radially into direct contact with said outer surface. In order to obtain both low friction and high wear resistance, theouter surface 14b of theshaft 14 is coated with a diamond like carbon (DLC) coating. The diamond like carbon coating may be a metal-mixed diamond like carbon coating comprising alternating layers of predominantly diamond like carbon but containing some metal carbide, and layers of predominantly metal carbide but containing some diamond like carbon, each of the order of 1 to 50 nanometre thickness for instance. Alternatively, the metal carbide can be in the form of clusters disposed throughout a layer of diamond like carbon. Such layers consist of a matrix of predominantly diamond like carbon with a dispersion of particles of metal carbide. Said particles can have clustered morphology regions of metal carbide up to 100 nm in extent. The clusters may be composed of carbides of one or more metals. - The metal mixed diamond like carbon coating may be formed on a metallic interlayer of Cr, W, Mo, or A1, which is pre-deposited onto the
outer surface 14b of theshaft 14. The diamond like carbon coating, applied to the metallic interlayer, may also contain one or more metallic carbide forming elements such as W, Mo or Ti. For more detail on such diamond like carbon coating, it could be referred toEP-B1-1 015 780 (SKF) which is hereby incorporated by reference. - Alternatively, the diamond like carbon coating may be a doped diamond like carbon coating, such as a metal doped hydrogenated diamond-like carbon coating a-C:H:Me or metal doped diamond like carbon coating Me-DLC. For the coating a-C:H:Me, the hydrogen concentration may be from 10 to 40% of hydrogen, and preferably from 20 to 30 %. Said coating may be doped with elements such as W or Ti. For the coating Me-DLC, the concentration of the metal may be from 5 to 30%, preferably from 15 to 25%.
- The doped diamond like carbon coating may have a multilayer structure with one layer rich in metal and another layer rich in carbon. The thickness of each layer may be from 2 to 10 nm, and preferably from 10 to 50 nm. The multilayer structure increases the toughness of the coating and gives rise to reduced residual stresses in the coating and therefore enhanced adhesion. In fact, a reduced residual stresses increase the resistance of the coating to indentation damage and reduce the risk of coating cracks and delamination. The total thickness of the doped diamond like carbon coating may be from 1 to 4 µm. The hardness of said coating may be from 8 to 25 GPa, and preferably from 10 to 15GPa. The doped diamond like carbon coating may be formed on a metallic interlayer of W or Ti which is pre-deposited onto the outer surface of the
shaft 14. The thickness of the metallic interlayer may be from 0.05 to 0.5 µm. A bond layer of W may be provided between the metallic interlayer and the doped diamond-like carbon coating. - The
bore 16a of theroller 16 in contact with the diamond like carbon coating of theshaft 14 is coated with a black oxide coating such as magnetite Fe3O4. The thickness of the black oxide coating may be from 0.5 to 1.5 µm, and preferably from 0.8 to 1.2 µm. For the sake of the coating process, all the surfaces of theroller 16 may be coated with the black oxide coating. With the black oxide coating, the adhesive wear or seizure is limited during an oil-free operation even in highly loaded conditions. Such coating acts as a wear resistance coating. Light preservative oil can be applied on both the black oxide coating of the roller and the diamond like carbon coating of the shaft to improve the ability to work in the oil-free condition and the resistance to rust. - In the described embodiment, the diamond like carbon coating is provided on the
shaft 14 and the black oxide coating on theroller 16. Alternatively, it may be possible to have adevice 10 with a diamond like carbon coating on the roller and a black oxide coating on the shaft. - The embodiment shown on
Figure 2 , in which identical parts are given identical references, differs from the previous embodiment in that thedevice 10 further comprises a sleeve or bushing 18 radially disposed between theouter surface 14b of thepin 14 and thebore 16a of theroller 16. An outercylindrical surface 18a of the bushing comes radially into contact with thebore 16a of the roller and abore 18b of said bushing comes radially into contact with theouter surface 14b of the shaft. Advantageously, thebushing 18 is coated with at least an antifriction and/or wear resistance coating. Thebushing 18 may be coated with a diamond like carbon coating or a black oxide coating as previously described. Preferably, theouter surface 18a of thebushing 18 is coated with the diamond like carbon coating when the black oxide coating is provided on thebore 16a of theroller 16, and thebore 18b of said bushing is coated with the black oxide coating when the diamond like carbon coating is provided on theouter surface 14b of theshaft 14. Alternatively, for a device having the diamond like carbon coating on the roller and the black oxide coating on the shaft, the disposition on the bushing of the black oxide and diamond like carbon coatings is inverted. - A third embodiment of a cam
follower roller device 10 is illustrated onFigure 3 , said device being used to control avalve 22 of aninternal combustion engine 24. Thedevice 10 comprises a rocker body orarm 26, apin 27 and ashaft 28 each extending along anaxis roller 30 supported on theshaft 28 and adapted to press against acam 32 of the internal combustion engine camshaft so that rotation of the camshaft causes a periodic pivoting of the rocker arm in order to open and close thevalve 22. Theroller 30 is rotatably mounted on an outercylindrical surface 28b of the shaft and has abore 30a of cylindrical shape which comes radially into direct contact with said outer surface. - The
rocker arm 26 comprises two identical and spacedwalls 26a which are assembled together to support therebetween thepin 27 and theshaft 28. One end of eachwall 26a presses against aplate 34 provided on the top of thecontrol valve 22. Aspring 35 is mounted between said plate and thecombustion engine 24. Theshaft 28 is mounted at the opposite end of eachwall 26a. Therocker arm 26 may pivot around theaxis 27a of thetransversal pin 27 which is parallel to theaxis 28a of the shaft. In this embodiment, theshaft 28 and theroller 30 are identical to those described is the first embodiment and comprise coatings as previously disclosed. Similarly, a bushing may radially be interposed between theroller 30 and theshaft 28 as disclosed in the second embodiment. - With the combination of two coatings applied separately on the shaft and the roller, and possibly on the bushing, and coming into contact one another, the service life of the device is enhanced even under highly loaded conditions and conditions where lubrication is poor or absent.
- Otherwise, in the case of a lubricated device, since it will take a few seconds for the lubricant to reach the contact zone, in addition to the coating(s), it is advantageous to apply some lubricant on the roller and/or pin, e.g. by dipping, either before or after assembly of the device. It is particularly advantageous to apply the lubricant on the component(s) with the black oxide coating because the latter is able to retain a quantity of lubricant higher than a non-coated surface or the diamond like carbon coating.
Claims (11)
- Cam follower roller device, notably for fuel injection pump of an internal combustion engine, comprising a body (12; 26), a shaft (14; 28) mounted on the body and a roller (16; 30) rotatably mounted on said shaft, characterized in that at least one of the shaft and the roller is coated with an antifriction and/or wear resistance coating.
- Device according to claim 1, wherein each of the shaft and the roller is coated with an antifriction and/or wear resistance coating.
- Device according to claim 2, wherein at least the outer surface (14b; 28b) of the shaft and the bore (16a; 30a) of the roller are coated with an antifriction and/or wear resistance coating.
- Device according to claim 2 or 3, wherein one of the shaft and the roller is coated with a diamond like carbon coating, the other being coated with a black oxide coating.
- Device according to claim 4, wherein the shaft is coated with the diamond like carbon coating and the roller is coated with the black oxide coating.
- Device according to claim 4 or 5, wherein the thickness of the diamond like carbon coating is from 1 to 4 µm.
- Device according to any of the preceding claims 4 to 6, wherein the thickness of the black oxide coating is from 0.5 to 1.5 µm, and preferably from 0.8 to 1.2 µm.
- Device according to any of the preceding claims, further comprising a bushing (18) radially interposed between the roller (16; 30) and the shaft (14; 28).
- Device according to claim 8, wherein the outer surface of the bushing (18) in contact with the roller and the bore of said bushing in contact with the shaft are each coated with an antifriction and/or wear resistance coating.
- Device according to claim 9, wherein one of the outer surface and the bore of the bushing (18) is coated with a diamond like carbon coating, the other being coated with a black oxide coating.
- Device according to claim 10, wherein the outer surface of the bushing (18) is coated with the diamond like carbon coating and the bore is coated with the black oxide coating.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12305653.3A EP2672116B1 (en) | 2012-06-07 | 2012-06-07 | Cam follower roller device, notably for a fuel injection pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12305653.3A EP2672116B1 (en) | 2012-06-07 | 2012-06-07 | Cam follower roller device, notably for a fuel injection pump |
Publications (2)
Publication Number | Publication Date |
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EP2672116A1 true EP2672116A1 (en) | 2013-12-11 |
EP2672116B1 EP2672116B1 (en) | 2017-10-18 |
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ID=46298325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12305653.3A Active EP2672116B1 (en) | 2012-06-07 | 2012-06-07 | Cam follower roller device, notably for a fuel injection pump |
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EP (1) | EP2672116B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3015597A1 (en) * | 2013-12-23 | 2015-06-26 | Skf Ab | FOLLOWING ROLL DEVICE OF A CAM |
FR3015598A1 (en) * | 2013-12-23 | 2015-06-26 | Skf Ab | FOLLOWING ROLL DEVICE OF A CAM |
US20160208902A1 (en) * | 2015-01-16 | 2016-07-21 | Aktiebolaget Skf | Cam follower |
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FR3015597A1 (en) * | 2013-12-23 | 2015-06-26 | Skf Ab | FOLLOWING ROLL DEVICE OF A CAM |
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US9562600B2 (en) | 2013-12-23 | 2017-02-07 | Aktiebolaget Skf | Cam follower roller device |
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US20160208902A1 (en) * | 2015-01-16 | 2016-07-21 | Aktiebolaget Skf | Cam follower |
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EP3045777B1 (en) * | 2015-01-16 | 2024-08-14 | Aktiebolaget SKF | Cam follower |
Also Published As
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