EP2853699B1 - Tappet, injection pump and valve actuator comprising such a tappet and manufacturing method for such a tappet - Google Patents
Tappet, injection pump and valve actuator comprising such a tappet and manufacturing method for such a tappet Download PDFInfo
- Publication number
- EP2853699B1 EP2853699B1 EP13186518.0A EP13186518A EP2853699B1 EP 2853699 B1 EP2853699 B1 EP 2853699B1 EP 13186518 A EP13186518 A EP 13186518A EP 2853699 B1 EP2853699 B1 EP 2853699B1
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- EP
- European Patent Office
- Prior art keywords
- axis
- mechanical system
- support element
- tappet
- pin
- Prior art date
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Links
- 238000002347 injection Methods 0.000 title claims description 9
- 239000007924 injection Substances 0.000 title claims description 9
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 4
- 238000002788 crimping Methods 0.000 claims description 4
- 229920002530 polyetherether ketone Polymers 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 230000000284 resting effect Effects 0.000 claims description 3
- 229920002994 synthetic fiber Polymers 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 description 6
- 229910000906 Bronze Inorganic materials 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000003466 welding Methods 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
- F01L1/14—Tappets; Push rods
-
- 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
- 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
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/445—Selection of particular materials
-
- 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
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/48—Assembling; Disassembling; Replacing
-
- 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
-
- 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
- F01L2307/00—Preventing the rotation of tappets
-
- 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
- F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit
-
- 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
- F02M2200/90—Selection of particular materials
- F02M2200/9015—Elastomeric or plastic materials
-
- 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
- F02M2200/90—Selection of particular materials
- F02M2200/9053—Metals
Definitions
- the invention concerns a mechanical system.
- the invention also concerns an injection pump and a valve actuator for a motor vehicle, by example for a gasoline engine car, each comprising such a mechanical system.
- the invention also concerns a method for manufacturing such a mechanical system.
- a cam follower belonging to an injection pump comprises at least a tappet, a roller and a pin in bronze or steel.
- the roller and the pin are centered on a transverse axis, while the tappet extends along a longitudinal axis.
- the tappet is formed with two lateral flanges, delimiting an intermediate gap between them and each comprising a cylindrical bore, possibly beveled.
- the roller is positioned in the intermediate gap, between both flanges and bores.
- the pin is fitted in the two bores, such that the roller is movable in rotation relative to the pin around its axis.
- the pin might be then caulked, in other words plastically deformed, on both opposite ends to create a mechanical connection by press-fit in the tappet bores.
- the roller collaborates with a cam synchronized with the internal combustion engine camshaft.
- the rotation of the camshaft leads to a periodic displacement of a piston of the pump that rests against the tappet, to allow fuel to be delivered.
- the tappet is movable back and forth along the longitudinal axis.
- the aim of the invention is to provide an improved mechanical system, such as a cam follower, provided with an anti-rotation function.
- the invention concerns a mechanical system, comprising a tappet including a body, a support element defining two bores centered on a first axis, the support element being distinct from the body and fixed thereto, a pin comprising two opposite ends each adapted to be fitted in one of the two bores, and a roller element positioned between the two bores along the first axis and movable in rotation relative to the pin around the first axis.
- the support element is fixed to the body by local deformations of the body and the support element also comprises at least one antirotation device integrally formed thereto.
- the mechanical system is provided with anti-rotation function and a pin support function on the same part, without using an additional part.
- Design of the mechanical system and its assembly are simplified. Position of the antirotation device relative to the pin axis and is more accurate.
- the antirotation device prevents the support element from rotating in a bore surrounding this support element, which is for example the tappet of a cam follower.
- such a mechanical system may incorporate one or several of the following features:
- the invention also concerns an injection pump for a motor vehicle, equipped with a mechanical system as mentioned here-above.
- the invention also concerns a valve actuator for a motor vehicle, equipped with a mechanical system as mentioned here-above.
- the invention also concerns a method for manufacturing a mechanical system as mentioned here-above, wherein the antirotation device is integrally formed with the support element by stamping, then the support element is mounted with a play inside the body, then fixed to the body by crimping.
- the mechanical system 1 represented on figures 1 to 6 is of the cam follower type, adapted to equip an injection pump for a motor vehicle, preferably for a gasoline engine car, not shown.
- the system 1 comprises a tappet 10, an insert 20, a pin 30, a roller 40 and a bearing 50.
- Pin 30, roller 40 and bearing 50 are centered on a transverse axis X1, while tappet 10 is centered on a longitudinal axis Y1.
- Axis X1 and Y1 are perpendicular.
- the bearing 50 consists of needles 52. Alternatively, it may consist of cylindrical rollers or a sliding bushing.
- Tappet 10 comprises a cylindrical body 11 centered on axis Y1 and extending between an upper edge 12 and a lower edge 13.
- Body 11 has a cylindrical outer surface 14 and a cylindrical inner bore 15 delimiting a cavity 16 inside tappet 10.
- This cavity 16 is adapted to receive a plunger or a push rod, not shown, following tappet 10 along axis Y1.
- This cavity 16 is also adapted to receive insert 20.
- Tappet 10 is movable back and forth along axis Y1, in a non-represented bore belonging to the injection pump or motor, with surface 14 sliding in this bore.
- Tappet 10 can be made of synthetic material, by example polyamide 6,6 (PA) or polyether-ether-ketone (PEEK), or made of metal, by example steel. Material of the tappet 10 is chosen resistant to oil and its additives and temperature variations.
- Insert 20 comprises a central core 21 and four lateral tab 22, 23, 25 and 26 extending from central portion 21 opposite axis Y1, then partly along a direction parallel to axis Y1.
- Each tab 22, 23, 25 and 26 comprises a curved portion, respectively 221, 231, 251 and 261, extending from core 21 opposite axis Y1 then curved from radial direction to upper direction; and an axial portion, respectively 222, 232, 252 and 262, extending along a direction parallel to axis Y1.
- Portions 222 and 223 are curved around axis Y1 and adapted to rest against bore 15 of tappet 10.
- Portion 252 is a lateral flange comprising a curved upper surface 253, two plane lower surfaces 254 and a cylindrical bore 258.
- Portion 262 is a lateral flange comprising a curved upper surface 263, two plane lower surfaces 264 and a cylindrical bore 268.
- Insert 20 forms a support element for pin 30, roller 40 and bearing 50.
- bores 258 and 268 of insert 20 are adapted to receive pin 30, on which roller 40 and bearing 50 are mounted.
- the two lateral flanges 252 and 262 extend parallel to axis Y1 in a bifurcated manner, on both side of axis Y1, with surfaces 254 and 264 resting against edge 12.
- the flanges 252 and 262 delimit between them an intermediate gap 27.
- Both bores 258 and 268 extend through flanges 252 and 262 along same axis X1 and have the same diameter.
- an antirotation device 24 is integrally formed with insert 20.
- Device 24 is a pin protruding from tab 23 along a direction parallel to an axis Z1 perpendicular to axes X1 and Y1.
- Pin 24 has a curved portion 241 and a radial portion 242.
- Portion 241 extends from tab 23 along axis Y1 then is curved opposite axis Y1 along axis Z1.
- Portion 242 extends along axis Z1, opposite axis Y1.
- Portion 242 comprises two lateral faces 243 and upper and lower faces 244.
- pin 24 and more precisely faces 243 cooperates with a non-represented guiding groove, formed in the bore surrounding tappet 10.
- pin 24 prevents tappet 10 from rotating in this bore around axis Y1.
- lower and upper faces 244 of pin 24 may form end stops adapted to abut against extremities of the guiding groove or of another part.
- Insert 20 is preferably made of metal, by example steel such as XC75. Material of insert 20 is chosen resistant to oil flow, temperature variations and mechanical strains. Insert 20 is preferably formed by stamping. In other words, elements 21 to 26 are delimited in a plane metal sheet, and then formed by stamping. Holes 28 are delimited between portions 221, 231, 251 and 261, in order to save material and avoid cracks when insert 20 is deformed by stamping. Insert 20 is clamped inside body 11, preferably force-fitted. Alternatively, insert 20 is mounted inside body 11 with a play radially to axis Y1, and then fixed to body 11, for instance by crimping, welding or soldering.
- Pin 30 comprises a cylindrical surface 32 extending between two pin ends 35 and 36.
- pin ends 35 and 36 are adapted to be caulked, respectively in bores 258 and 268.
- Pin 30 is made of metal, such as steel or bronze. If made of steel, pin 30 is preferably subjected to heat treatment before the caulking step. More precisely, pin ends 35 and 36 may be subjected to an induction hardening step just before the caulking step.
- Roller 40 has an outer cylindrical surface 41 and an inner cylindrical bore 42 centered on axis X1.
- Surface 41 is intended to bear against an outer surface of a non-represented cam, synchronized with the internal combustion engine camshaft.
- Surface 41 is preferably subjected to heat treatment to increase its resistance to load and/or wear.
- Needle bearing 50 comprises a series of needles 52 extending parallel to axis X1 and distributed regularly around axis X1. Needles 52 are interposed between surface 32 of pin 30 and surface 42 of roller 40.
- roller 40 and rolling bearing 50 are positioned before pin 30 in the intermediate gap 27 between the two flanges 252 and 262. Then pin 30 is inserted inside bores 258 and 268 of insert 20 and inside rolling bearing 50. Finally pin ends 35 and 36 are caulked in bores 258 and 268.
- roller 40 is movable in rotation relative to pin 30 around axis X1. Pin axis, roller axis and rolling bearing axis merge with axis X1. Roller 40 is then adapted to roll, more precisely its surface 41 can roll, on an outer surface of the non-represented cam.
- the load applied on surface 41 of roller 40 is transmitted to rolling bearing 50, then to pin 30, then to insert 20, then to tappet 10 and to the non-represented plunger or push rod located inside cavity 16 of tappet 10.
- Core 21 of insert 20 rests in contact against this part.
- the surfaces 254 and 264 rest in contact against the surface of edge 12, such that the load applied on the roller 40 is at least partly transmitted via these surfaces from the support element 20 to the body 11.
- most of the load applied on roller 40 is received by insert 20 instead of tappet 10, then is transmitted to the plunger or push rod.
- Tappet 10 slides back and forth but bears few mechanical strains along axis Y1.
- Insert 20 has three different functions. Insert 20 forms a support element for pin 30. Insert 20 comprises an antirotation device 24 integrally formed thereto. Insert 20 is in contact with the plunger or push rod located inside cavity 16 for load transmission.
- FIGS 7 and 8 show a mechanical system 1 according to the invention. Only the differences with respect to the first embodiment are described hereafter.
- Body 11 comprises local deformations 120 and 140 for fixing insert 20 to tappet 10.
- Deformations 120 are made after deformations 140.
- body 11 includes five deformations 120 distributed on edge 12 and four deformation 140 regularly distributed around axis Y1.
- Deformations 140 may be made by punching outer surface 14 of body 11, thus including a recess 141 formed on outer surface 14 and a protrusion 142 formed on inner surface 15 toward axis Y1.
- Portions 221, 231, 251 and 261 of insert 20 come in bearing contact with protrusion 142 inside cavity 16, thus preventing insert 20 to move inside cavity 16 toward edge 13.
- Deformations 140 can be made before or after mounting insert 20 inside body 11.
- Deformations 120 are made by punching material of edge 12 against insert 20 along axis Y1, thus preventing insert 20 to move outside cavity 16 at edge 12. Thanks to deformations 120 and 140, insert 20 is fixed to body 11 by crimping.
- tappet 10, insert 20 and/or roller element 40 may have different configurations, by example depending on the intended application of system 1.
- number, shape and position of device(s) 24 may vary without leaving the scope of the invention.
- system 1 may constitute a rocker arm, wherein the support element 10 is not a tappet and wherein the roller element 40 is secured to an arm and a tappet, for example acting on a valve stem.
- system 1 comprises no rolling bearing 50, while pin 30 and roller 40 form together a plain bearing.
- bearing 50 may be replaced by a bushing.
- system 1 comprises two antirotation devices 24.
- both antirotation devices 24 may be formed on tab 23 and be aligned parallel to axis Y1, so that they can be positioned in the same groove formed in bore surrounding tappet 10.
- the two antirotation devices 24 may be diametrically opposed relative to axis Y1, with a first device formed on tab 23 and a second device formed on tab 24.
- system 1 is such that the support element 20 is distinct from the body 11 and fixed thereto.
- the support element 20 comprises at least one antirotation device 24 integrally formed thereto. This antirotation device 24 is adapted to fit and slide in a groove surrounding the body 11.
Description
- The invention concerns a mechanical system. The invention also concerns an injection pump and a valve actuator for a motor vehicle, by example for a gasoline engine car, each comprising such a mechanical system. The invention also concerns a method for manufacturing such a mechanical system.
- Classically, a cam follower belonging to an injection pump comprises at least a tappet, a roller and a pin in bronze or steel. The roller and the pin are centered on a transverse axis, while the tappet extends along a longitudinal axis. The tappet is formed with two lateral flanges, delimiting an intermediate gap between them and each comprising a cylindrical bore, possibly beveled. The roller is positioned in the intermediate gap, between both flanges and bores. The pin is fitted in the two bores, such that the roller is movable in rotation relative to the pin around its axis. The pin might be then caulked, in other words plastically deformed, on both opposite ends to create a mechanical connection by press-fit in the tappet bores.
- When the cam follower is in service, the roller collaborates with a cam synchronized with the internal combustion engine camshaft. The rotation of the camshaft leads to a periodic displacement of a piston of the pump that rests against the tappet, to allow fuel to be delivered. The tappet is movable back and forth along the longitudinal axis.
- In practice, the angular orientation of the cam follower around its longitudinal axis induces the angular orientation of the transverse axis, pin and roller relative to this longitudinal axis. In case of incorrect orientation, the collaboration between roller and cam is improper and the roller rotation may be obstructed. In other words, an incorrect orientation around the longitudinal axis would cause malfunction of cam follower, injection pump and motor.
- It is known to provide the cam follower with an anti-rotation function by fixing an additional part to the tappet. Documents
WO-A-2010/048 968 ,DE 43 31 694 A1 ,US-B-7 210 437 andUS-A-2008/190 237 describe examples of such cam followers provided with an anti-rotation device. The device slides in a guide of a bore surrounding the tappet, thus ensuring correct orientation of the cam follower and preventing its accidental rotation around its longitudinal axis. However, that increases the number of subcomponents of these cam followers. Their assembly is made more complex and longer. - The aim of the invention is to provide an improved mechanical system, such as a cam follower, provided with an anti-rotation function.
- To this end, the invention concerns a mechanical system, comprising a tappet including a body, a support element defining two bores centered on a first axis, the support element being distinct from the body and fixed thereto, a pin comprising two opposite ends each adapted to be fitted in one of the two bores, and a roller element positioned between the two bores along the first axis and movable in rotation relative to the pin around the first axis.
- According to the invention, the support element is fixed to the body by local deformations of the body and the support element also comprises at least one antirotation device integrally formed thereto.
- Thanks to the invention, the mechanical system is provided with anti-rotation function and a pin support function on the same part, without using an additional part. Design of the mechanical system and its assembly are simplified. Position of the antirotation device relative to the pin axis and is more accurate. The antirotation device prevents the support element from rotating in a bore surrounding this support element, which is for example the tappet of a cam follower.
- According to further aspects of the invention which are advantageous but not compulsory, such a mechanical system may incorporate one or several of the following features:
- The body is cylindrical and centered on a second axis perpendicular to the first axis, the body having a cylindrical outer surface and a cylindrical inner surface delimiting a cavity, a first deformation of the local deformations including a recess formed on the outer surface of the body and a protrusion formed on the inner surface...
- The support element comprises a central core and four lateral tabs extending from the central core, each lateral tab comprising a curved portion, extending from the central core, and an axial portion, extending along a direction parallel to the second axis, the curved portions of the support element coming in bearing contact with protrusion inside the cavity.
- The body extends between an upper edge and a lower edge, second deformations of the local deformations being made by punching material of the upper edge against the support element, along the second axis.
- The antirotation device is a pin protruding from one of the tabs of the support element along a direction parallel to a third axis perpendicular to the first axis and to the second axis, the antirotation device being adapted for cooperation with a guiding groove.
- The mechanical system comprises at least two antirotation devices integrally formed with the support element.
- The support element comprises at least one surface resting against at least one surface of the body, such that a load applied on the roller element is at least partly transmitted via these surfaces from the support element to the body.
- The body is made of synthetic material, for example of polyamide or polyether-ether-ketone.
- The body is made of metal, for example of steel.
- The support element is made of metal, for example of steel, and stamped to form the antirotation device and flanges including the bores.
- The mechanical system comprises a bearing interposed between the pin and the roller element.
- The mechanical system constitutes a cam follower, the tappet is movable along a translation axis perpendicular to the first axis and the roller element is adapted to roll on an outer surface of a cam.
- The invention also concerns an injection pump for a motor vehicle, equipped with a mechanical system as mentioned here-above.
- The invention also concerns a valve actuator for a motor vehicle, equipped with a mechanical system as mentioned here-above.
- The invention also concerns a method for manufacturing a mechanical system as mentioned here-above, wherein the antirotation device is integrally formed with the support element by stamping, then the support element is mounted with a play inside the body, then fixed to the body by crimping.
- The invention will now be explained in correspondence with the annexed figures, as an illustrative example, without restricting the object of the invention. In the annexed figures:
-
Figure 1 is a side view of a mechanical system, of the cam follower type, comprising a tappet, an insert and a roller; -
Figure 2 is a top view, along arrow II offigure 1 ; -
Figures 3 and 4 are a sectional views, respectively along line III-III and along line IV-IV offigure 2 , showing a pin and a bearing supporting the roller; -
Figure 5 is a perspective view showing the tappet and the insert belonging to the mechanical system offigures 1 to 4 , without the pin, the bearing and the roller; -
Figure 6 is a side view of the insert, along arrow VI offigure 5 ; -
Figure 7 is a perspective view, showing a mechanical system according the invention; and -
Figure 8 is a sectional view similar tofigure 4 , showing the mechanical system offigure 7 . - The
mechanical system 1 represented onfigures 1 to 6 is of the cam follower type, adapted to equip an injection pump for a motor vehicle, preferably for a gasoline engine car, not shown. - The
system 1 comprises atappet 10, aninsert 20, apin 30, aroller 40 and abearing 50.Pin 30,roller 40 and bearing 50 are centered on a transverse axis X1, whiletappet 10 is centered on a longitudinal axis Y1. Axis X1 and Y1 are perpendicular. In the embodiment offigures 1 to 6 , thebearing 50 consists ofneedles 52. Alternatively, it may consist of cylindrical rollers or a sliding bushing. -
Tappet 10 comprises acylindrical body 11 centered on axis Y1 and extending between anupper edge 12 and alower edge 13.Body 11 has a cylindricalouter surface 14 and a cylindricalinner bore 15 delimiting acavity 16 inside tappet 10. Thiscavity 16 is adapted to receive a plunger or a push rod, not shown, following tappet 10 along axis Y1. Thiscavity 16 is also adapted to receiveinsert 20.Tappet 10 is movable back and forth along axis Y1, in a non-represented bore belonging to the injection pump or motor, withsurface 14 sliding in this bore.Tappet 10 can be made of synthetic material, by example polyamide 6,6 (PA) or polyether-ether-ketone (PEEK), or made of metal, by example steel. Material of thetappet 10 is chosen resistant to oil and its additives and temperature variations. -
Insert 20 comprises acentral core 21 and fourlateral tab central portion 21 opposite axis Y1, then partly along a direction parallel to axis Y1. Eachtab core 21 opposite axis Y1 then curved from radial direction to upper direction; and an axial portion, respectively 222, 232, 252 and 262, extending along a direction parallel to axis Y1.Portions 222 and 223 are curved around axis Y1 and adapted to rest against bore 15 oftappet 10.Portion 252 is a lateral flange comprising a curvedupper surface 253, two planelower surfaces 254 and acylindrical bore 258.Portion 262 is a lateral flange comprising a curvedupper surface 263, two planelower surfaces 264 and acylindrical bore 268. -
Insert 20 forms a support element forpin 30,roller 40 andbearing 50. Specifically, bores 258 and 268 ofinsert 20 are adapted to receivepin 30, on whichroller 40 andbearing 50 are mounted. Wheninsert 20 is fixed totappet 10, the twolateral flanges surfaces edge 12. Theflanges intermediate gap 27. Both bores 258 and 268 extend throughflanges - Moreover, an
antirotation device 24 is integrally formed withinsert 20.Device 24 is a pin protruding fromtab 23 along a direction parallel to an axis Z1 perpendicular to axes X1 and Y1.Pin 24 has acurved portion 241 and aradial portion 242.Portion 241 extends fromtab 23 along axis Y1 then is curved opposite axis Y1 along axis Z1.Portion 242 extends along axis Z1, opposite axis Y1.Portion 242 comprises twolateral faces 243 and upper and lower faces 244. Whensystem 1 is operated,pin 24 and more precisely faces 243 cooperates with a non-represented guiding groove, formed in thebore surrounding tappet 10. Thus,pin 24 preventstappet 10 from rotating in this bore around axis Y1. Depending on configuration of the injection pump, lower andupper faces 244 ofpin 24 may form end stops adapted to abut against extremities of the guiding groove or of another part. -
Insert 20 is preferably made of metal, by example steel such as XC75. Material ofinsert 20 is chosen resistant to oil flow, temperature variations and mechanical strains.Insert 20 is preferably formed by stamping. In other words,elements 21 to 26 are delimited in a plane metal sheet, and then formed by stamping.Holes 28 are delimited betweenportions insert 20 is deformed by stamping.Insert 20 is clamped insidebody 11, preferably force-fitted. Alternatively, insert 20 is mounted insidebody 11 with a play radially to axis Y1, and then fixed tobody 11, for instance by crimping, welding or soldering. -
Pin 30 comprises acylindrical surface 32 extending between two pin ends 35 and 36. In practice, pin ends 35 and 36 are adapted to be caulked, respectively inbores Pin 30 is made of metal, such as steel or bronze. If made of steel,pin 30 is preferably subjected to heat treatment before the caulking step. More precisely, pin ends 35 and 36 may be subjected to an induction hardening step just before the caulking step. -
Roller 40 has an outercylindrical surface 41 and an inner cylindrical bore 42 centered on axis X1.Surface 41 is intended to bear against an outer surface of a non-represented cam, synchronized with the internal combustion engine camshaft.Surface 41 is preferably subjected to heat treatment to increase its resistance to load and/or wear. - Needle bearing 50 comprises a series of
needles 52 extending parallel to axis X1 and distributed regularly around axis X1.Needles 52 are interposed betweensurface 32 ofpin 30 andsurface 42 ofroller 40. - During the assembly of
system 1,roller 40 and rollingbearing 50 are positioned beforepin 30 in theintermediate gap 27 between the twoflanges bores insert 20 and inside rollingbearing 50. Finally pin ends 35 and 36 are caulked inbores roller 40 is movable in rotation relative to pin 30 around axis X1. Pin axis, roller axis and rolling bearing axis merge with axis X1.Roller 40 is then adapted to roll, more precisely itssurface 41 can roll, on an outer surface of the non-represented cam. - In practice, the load applied on
surface 41 ofroller 40 is transmitted to rollingbearing 50, then to pin 30, then to insert 20, then totappet 10 and to the non-represented plunger or push rod located insidecavity 16 oftappet 10.Core 21 ofinsert 20 rests in contact against this part. Thesurfaces edge 12, such that the load applied on theroller 40 is at least partly transmitted via these surfaces from thesupport element 20 to thebody 11. However, most of the load applied onroller 40 is received byinsert 20 instead oftappet 10, then is transmitted to the plunger or push rod.Tappet 10 slides back and forth but bears few mechanical strains along axis Y1. -
Insert 20 has three different functions.Insert 20 forms a support element forpin 30.Insert 20 comprises anantirotation device 24 integrally formed thereto.Insert 20 is in contact with the plunger or push rod located insidecavity 16 for load transmission. -
Figures 7 and 8 show amechanical system 1 according to the invention. Only the differences with respect to the first embodiment are described hereafter. -
Body 11 compriseslocal deformations insert 20 totappet 10.Deformations 120 are made afterdeformations 140. On the example offigures 7 and 8 ,body 11 includes fivedeformations 120 distributed onedge 12 and fourdeformation 140 regularly distributed around axis Y1.Deformations 140 may be made by punchingouter surface 14 ofbody 11, thus including arecess 141 formed onouter surface 14 and aprotrusion 142 formed oninner surface 15 toward axis Y1.Portions insert 20 come in bearing contact withprotrusion 142 insidecavity 16, thus preventinginsert 20 to move insidecavity 16 towardedge 13.Deformations 140 can be made before or after mountinginsert 20 insidebody 11.Deformations 120 are made by punching material ofedge 12 againstinsert 20 along axis Y1, thus preventinginsert 20 to move outsidecavity 16 atedge 12. Thanks todeformations body 11 by crimping. - Other non-shown embodiments can be implemented without leaving the scope of the invention. For example,
tappet 10, insert 20 and/orroller element 40 may have different configurations, by example depending on the intended application ofsystem 1. According to another example, number, shape and position of device(s) 24 may vary without leaving the scope of the invention. - According to a non-shown embodiment,
system 1 may constitute a rocker arm, wherein thesupport element 10 is not a tappet and wherein theroller element 40 is secured to an arm and a tappet, for example acting on a valve stem. - According to another non-shown embodiment,
system 1 comprises no rollingbearing 50, whilepin 30 androller 40 form together a plain bearing. Indeed, in heavy duty applications such as in diesel truck engines, there is a lack of space and/or excessive loads involved for the implementation of the rollingbearing 50, thus justifying the use of a plain bearing. Alternatively, bearing 50 may be replaced by a bushing. - According to another non-shown embodiment,
system 1 comprises twoantirotation devices 24. By example, bothantirotation devices 24 may be formed ontab 23 and be aligned parallel to axis Y1, so that they can be positioned in the same groove formed inbore surrounding tappet 10. Alternatively, the twoantirotation devices 24 may be diametrically opposed relative to axis Y1, with a first device formed ontab 23 and a second device formed ontab 24. - Whatever the embodiment,
system 1 is such that thesupport element 20 is distinct from thebody 11 and fixed thereto. Moreover, thesupport element 20 comprises at least oneantirotation device 24 integrally formed thereto. Thisantirotation device 24 is adapted to fit and slide in a groove surrounding thebody 11. - In addition, technical features of the different embodiments can be, in whole or part, combined with each other. Thus, the
mechanical system 1 and its manufacturing method can be adapted to the specific requirements of the application.
Claims (15)
- A mechanical system (1), comprising:- a tappet (10) including a body (11),- a support element (20) defining two bores (258, 268) centered on a first axis (X1), the support element being distinct from the body and fixed thereto, - a pin (30) comprising two opposite ends (35, 36) each adapted to be fitted in one of the two bores (258, 268), and- a roller element (40) positioned between the two bores (258, 268) along the first axis (X1) and movable in rotation relative to the pin (30) around the first axis (X1),characterised in that
the support element (20) is fixed to the body (11) by local deformations (120 ; 140) of the body (11) and wherein the support element (20) also comprises at least one antirotation device (24) integrally formed thereto. - The mechanical system (1) according to claim 1, wherein the body (11) is cylindrical and centered on a second axis (Y1) perpendicular to the first axis (X1), the body (11) having a cylindrical outer surface (14) and a cylindrical inner surface (15) delimiting a cavity (16), a first deformation (140) of the local deformations (120, 140) including a recess (141) formed on the outer surface (14) of the body (11) and a protrusion (142) formed on the inner surface (15).
- The mechanical system (1) according to claim 2, wherein the support element (20) comprises a central core (21) and four lateral tabs (22, 23, 25, 26) extending from the central core (21), each lateral tab (22, 23, 25, 26) comprising a curved portion (221, 231, 251, 261), extending from the central core (21), and an axial portion (222, 232, 252, 262), extending along a direction parallel to the second axis (Y1), the curved portions (221, 231, 251, 261) of the support element (20) coming in bearing contact with protrusion (142) inside the cavity (16).
- The mechanical system (1) according to any one of claims 2 or 3, wherein the body (11) extends between an upper edge (12) and a lower edge (13), second deformations (120) of the local deformations (120, 140) being made by punching material of the upper edge (12) against the support element (20), along the second axis (Y1).
- The mechanical system (1) according to any one of the claims 3 or 4, wherein the antirotation device (24) is a pin protruding from one of the tabs (23) of the support element (20) along a direction parallel to a third axis (Z1) perpendicular to the first axis (X1) and to the axis (Y1), the antirotation device (24) being adapted for cooperation with a guiding groove.
- The mechanical system (1) according to any one of the previous claims, comprising at least two antirotation devices (24) integrally formed with the support element (20).
- The mechanical system (1) according to any one of the previous claims, wherein the support element (20) comprises at least one surface (254, 264 ; 221, 231, 251, 261) resting against at least one surface (12 ; 142) of the body (11), such that a load applied on the roller element (40) is at least partly transmitted via these surfaces (12, 254, 264; 142, 221, 231, 251, 261) from the support element (20) to the body (11).
- The mechanical system (1) according to any one of the previous claims 1 to 7, wherein the body (11) is made of synthetic material, for example of polyamide or polyether-ether-ketone.
- The mechanical system (1) according to any one of the previous claims 1 to 7, wherein the body (11) is made of metal, for example of steel.
- The mechanical system (1) according to any one of the previous claims, wherein the support element (20) is made of metal, for example of steel, and stamped to form the antirotation device (24) and flanges (252, 262) including the bores (258, 268).
- The mechanical system (1) according to any one of the previous claims, comprising a bearing (50) interposed between the pin (30) and the roller element (40).
- The mechanical system (1) according to any one of the previous claims, wherein it constitutes a cam follower, wherein the tappet (10) is movable along a translation axis (Y1) perpendicular to the first axis (X1) and wherein the roller element (40) is adapted to roll on an outer surface of a cam.
- An injection pump for a motor vehicle, wherein it comprises a mechanical system (1) according to any one of claims 1 to 12.
- A valve actuator for a motor vehicle, wherein it comprises a mechanical system (1) according to any one of claims 1 to 12.
- Method for manufacturing a mechanical system (1) according to any one of claims 1 to 12, wherein the antirotation device (24) is integrally formed with the support element (20) by stamping, then the support element (20) is mounted with a play inside the body (11), then fixed to the body (11) by crimping.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13186518.0A EP2853699B1 (en) | 2013-09-27 | 2013-09-27 | Tappet, injection pump and valve actuator comprising such a tappet and manufacturing method for such a tappet |
CN201410510117.4A CN104514655B (en) | 2013-09-27 | 2014-09-28 | Mechanical system, syringe pump and valve actuator and manufacturing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP13186518.0A EP2853699B1 (en) | 2013-09-27 | 2013-09-27 | Tappet, injection pump and valve actuator comprising such a tappet and manufacturing method for such a tappet |
Publications (2)
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EP2853699A1 EP2853699A1 (en) | 2015-04-01 |
EP2853699B1 true EP2853699B1 (en) | 2016-05-25 |
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EP13186518.0A Active EP2853699B1 (en) | 2013-09-27 | 2013-09-27 | Tappet, injection pump and valve actuator comprising such a tappet and manufacturing method for such a tappet |
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EP (1) | EP2853699B1 (en) |
CN (1) | CN104514655B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102015218754B4 (en) | 2015-09-29 | 2018-08-30 | Continental Automotive Gmbh | high pressure pump |
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JP6411275B2 (en) | 2015-04-10 | 2018-10-24 | 株式会社オティックス | Lifter detent structure |
EP3124759A1 (en) * | 2015-07-30 | 2017-02-01 | Aktiebolaget SKF | Roller device, pin for use in a roller device and method for locking a pin |
GB2542349A (en) * | 2015-09-15 | 2017-03-22 | Gm Global Tech Operations Llc | Fuel unit pump and internal combustion engine comprising it |
US10119607B2 (en) | 2016-04-15 | 2018-11-06 | Koyo Bearings North America Llc | Follower mechanism |
US20190309658A1 (en) * | 2018-04-04 | 2019-10-10 | GM Global Technology Operations LLC | Cam follower assembly |
US11149593B2 (en) | 2019-10-03 | 2021-10-19 | Koyo Bearings North America Llc | Tappet assembly with formed anti-rotation alignment device |
US11143059B2 (en) | 2019-10-03 | 2021-10-12 | Koyo Bearings North America Llc | Tappet assembly with unground outer cup |
Family Cites Families (8)
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US5307769A (en) * | 1993-06-07 | 1994-05-03 | General Motors Corporation | Low mass roller valve lifter assembly |
US5553512A (en) * | 1993-09-14 | 1996-09-10 | Ntn Corporation | Roller tappet having yoke member with flat top plate |
JP2002332809A (en) * | 2001-05-07 | 2002-11-22 | Fuji Oozx Inc | Valve system in internal combustion engine |
DE102004036106A1 (en) | 2004-07-24 | 2006-03-16 | Ina-Schaeffler Kg | Periodically actuated plunger for a valve or pump drive |
US7793583B2 (en) | 2006-12-06 | 2010-09-14 | Schaeffler Kg | Mechanical tappet in particular for a fuel pump of an internal combustion engine |
JP4930478B2 (en) * | 2008-09-04 | 2012-05-16 | トヨタ自動車株式会社 | Roller lifter, roller lifter manufacturing method, and liquid pump |
US20120111140A1 (en) | 2008-10-27 | 2012-05-10 | Hans-Joachim Buechelmaier | Antirotation Device |
KR101627956B1 (en) * | 2012-02-08 | 2016-06-07 | 코요 베어링즈 노쓰 아메리카 엘엘씨 | Follower mechanism |
-
2013
- 2013-09-27 EP EP13186518.0A patent/EP2853699B1/en active Active
-
2014
- 2014-09-28 CN CN201410510117.4A patent/CN104514655B/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015218754B4 (en) | 2015-09-29 | 2018-08-30 | Continental Automotive Gmbh | high pressure pump |
Also Published As
Publication number | Publication date |
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CN104514655A (en) | 2015-04-15 |
CN104514655B (en) | 2019-01-29 |
EP2853699A1 (en) | 2015-04-01 |
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