EP3181838B1 - Verfahren zur herstellung eines stifts für nockenfolgerrollenvorrichtung - Google Patents

Verfahren zur herstellung eines stifts für nockenfolgerrollenvorrichtung Download PDF

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Publication number
EP3181838B1
EP3181838B1 EP15307020.6A EP15307020A EP3181838B1 EP 3181838 B1 EP3181838 B1 EP 3181838B1 EP 15307020 A EP15307020 A EP 15307020A EP 3181838 B1 EP3181838 B1 EP 3181838B1
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EP
European Patent Office
Prior art keywords
pin
tempering
tempered
tappet body
hardness
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.)
Active
Application number
EP15307020.6A
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English (en)
French (fr)
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EP3181838A1 (de
Inventor
Alain Gezault
Benoit Hauvespre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF AB
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SKF AB
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Publication date
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Priority to EP15307020.6A priority Critical patent/EP3181838B1/de
Publication of EP3181838A1 publication Critical patent/EP3181838A1/de
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Classifications

    • 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
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • 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

Definitions

  • the present invention relates to the field of cam follower roller devices used in automotive or industrial applications.
  • the present invention relates to the manufacturing of a pin for cam follower roller device.
  • a pin for cam follower roller device may be used in a fuel injection pump intended for an internal combustion engine, in particular of a motor vehicle.
  • a cam follower roller device may also be used in a rocker system intended for controlling valves of an internal combustion piston engine.
  • Such a cam follower roller device generally comprises an outer tappet body, the pin mounted on the tappet body, and a roller movable in rotation relative to the pin around its axis.
  • cam followers are known from DE 196 12 969 A1 , EP 1 329 596 A2 , US 2004/000280 A1 , JP 2006 250294 A , JP 2003 343695 A or US 2008/190237 A1 .
  • the roller collaborates with a cam synchronized with the internal combustion engine camshaft or crankshaft.
  • the rotation of the camshaft, or crankshaft leads to a periodic displacement of a piston of the pump that rests against the tappet body, to allow fuel to be delivered.
  • each end of the pin may be caulked, in other words plastically deformed, to create a mechanical interference in through-holes of the tappet body in order to fix axially and/or block the pin rotation.
  • caulking steps may be provided since the pin ends are unaffected by the hardening process.
  • One aim of the present invention is to overcome these drawbacks.
  • the invention relates to a method for manufacturing a pin adapted to equip a cam follower roller device.
  • the method comprises the following successive steps of:
  • the pin may be caulked on both opposite pin ends to create a mechanical connection with the tappet body since the hardness is locally reduced at said pin ends.
  • the through-hardening treatment step may comprise the following successive operations of:
  • the tempering temperature applied to the whole pin during the through-tempering operation is lower than the tempering temperature applied during the local tempering treatment step.
  • the whole pin may tempered at a temperature within a range of 150°C to 250°C.
  • the pin ends may be tempered at a temperature and time during the local tempering treatment step which permit to get a hardness below 550 Vickers.
  • the pin ends may be tempered with induction heating during the local tempering treatment step.
  • Each pin end may be tempered with at least one inductor disposed in front of a lateral end face of said pin end.
  • the pin ends may be tempered by using any other appropriate heating means such as a liquid bath heated to the required temperature, a blowpipe, etc.
  • the invention also relates to a cam follower roller device comprising a tappet body, a pin mounted into said tappet body, and a roller mounted on said pin.
  • the pin is manufactured according to a method object of the invention.
  • the pin ends may be caulked in through-holes provided on the tappet body.
  • the device may further comprise an insert supporting the pin while the tappet body supports said insert, the pin ends being press-fitted in through-holes provided on said insert.
  • a cam follower roller device 10 comprises a tappet housing or body 12 extending along an axis 12a, a shaft or pin 14 extending along an axis 14a perpendicular to the axis 12a, and a roller 16, with an axis 16a coaxial with the axis 14, mounted on the pin and movable in rotation relative to said pin.
  • the pin 14 is mounted on the tappet body 12.
  • the tappet body 12 supports the pin 14.
  • the pin 14 comprises two opposite pin ends 14b, 14c and a central portion 14d extending between said pin ends.
  • the pin ends 14b, 14c are mounted in through-holes (not referenced) provided on the tappet body 12 and facing one another.
  • the pin ends 14b, 14c are caulked into said through-holes by push-fitting.
  • Each pin end 14b, 14c comprises a radial frontal end face. The opposite end faces axially delimit the pin 14.
  • the central portion 14d of the pin delimits a cylindrical outer bearing seat for the roller 16.
  • the pin ends 14b, 14c extend axially on either side of the roller 16.
  • the roller 16 is directly mounted on the central portion 14d of the pin.
  • a rolling bearing or a plain bearing may be radially interposed.
  • the tappet body 12 is made in one part.
  • the tappet body 12 delimits a first open cavity 18 inside which is located the roller 16.
  • the roller 16 is mounted inside the cavity 18.
  • the roller 16 axially protrudes outwards with respect to an upper face 12b of the tappet body.
  • the tappet body 12 also comprises a lower face 12c which delimits axially together with the upper face 12d said body.
  • the tappet body 12 also delimits a second open cavity 20 oriented axially on the side opposite to the cavity 18.
  • a movable element 21, such as a piston of a fuel injection pump, extends into the cavity 20. Said element 21 axially bears against a rear abutment surface of the tappet body.
  • the material of the pin 14A has a composition dedicated to through-hardening treatment, for example a steel grade made of 100 Cr6.
  • a through-hardening treatment is applied to the whole pin 14A to obtain a pin with a predetermined hardness, for example a hardness higher than 650 Vickers.
  • the pin 14A is submitted to an austenitization operation 104, for example into an oven at a predetermined temperature, for example equal to 850°C, and during a predetermined duration.
  • a through-hardening operation 106 for example in an oil bath, and a through-tempering operation 108 are successively carried out on the pin.
  • the whole pin is tempered for example at a temperature within a range of 150°C to 250°C, for example into an oven.
  • a further local tempering treatment is applied to the hardened pin. Contrary to the first step 102 where the through-hardening treatment is applied on the whole pin, in the second step 110, only pin ends are tempered in order to obtain the desired ductility for said pin ends.
  • an inductor 22, 24 is for example disposed in front of each end face of the pin.
  • Each inductor 22, 24 heats only the associated pin end in order to obtain a local tempering treatment of the pin.
  • each pin end may be tempered at a temperature and time to reach a hardness below 550 Vickers. Only the pin ends on chosen depth are tempered not the entire pin. After that, the desired pin 14 is obtained.
  • the end pins 14b, 14c are delimited by dashed lines.
  • each pin end 14b, 14c has a reduced hardness with regard to the hardness of the central part 14d of the pin. Accordingly, each pin end 14b, 14c may be easily caulked by press-fit in through-holes of the tappet body.
  • the outer surface of the central part 14d of the pin may have at least a hardness of 650 Vickers.
  • Each pin end 14b, 14c may have a hardness lower than 550 Vickers.
  • the invention has been illustrated on the basis of a cam follower roller device comprising a pin mounted directly on the tappet body.
  • the device may comprise an insert supporting the pin while the tappet body supports said insert.
  • the ends of the pin may be press-fitted in through-holes provided on said insert.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (10)

  1. Verfahren zur Herstellung eines Stifts (14) für eine Kurvenrollenvorrichtung (10), umfassend die folgenden aufeinander folgenden Schritte:
    - Durchführen einer durchgehenden Härtungsbehandlung und einer durchgehenden Vergütungsbehandlung (108), um den Stift mit einer vorgegebenen Härte zu erhalten, und
    - Durchführen einer lokalen Vergütungsbehandlung (102), bei der nur die Stiftenden (14b, 14c) des gehärteten Stifts vergütet werden, um die Härte der Stiftenden relativ zu der Härte des restlichen Stifts zu reduzieren.
  2. Verfahren nach Anspruch 1, wobei der Schritt der durchgehenden Härtungsbehandlung die folgenden aufeinander folgenden Vorgänge umfasst:
    - Durchführen eines Austenitisierungsvorgangs (104),
    - Durchführen eines durchgehenden Härtungsvorgangs (106) und
    - Durchführen eines durchgehenden Vergütungsvorgangs (108) an dem gesamten Stift.
  3. Verfahren nach Anspruch 2, wobei die während des durchgehenden Vergütungsvorgangs (108) auf den gesamten Stift (14) angelegte Vergütungstemperatur niedriger als die während des Schritts der lokalen Vergütungsbehandlung (102) angelegte Vergütungstemperatur ist.
  4. Verfahren nach Anspruch 2 oder 3, wobei der gesamte Stift (14) bei einer Temperatur im Bereich von 150 °C bis 250 °C während des durchgehenden Vergütungsvorgangs vergütet wird.
  5. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Stiftenden (14b, 14c) während des Schritts der lokalen Vergütungsbehandlung (102) vergütet werden, um eine Vickers-Härte von unter 550 zu erhalten.
  6. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Stiftenden (14b, 14c) während des Schritts der lokalen Vergütungsbehandlung (102) durch induktive Erwärmung vergütet werden.
  7. Verfahren nach Anspruch 6, wobei jedes Stiftende mit wenigstens einem Induktor (22, 24) vergütet wird, der vor einer seitlichen Endfläche des Stiftendes angeordnet ist.
  8. Kurvenrollenvorrichtung, umfassend einen Nockenkörper (12), einen in dem Nockenkörper befestigten Stift (14) und eine an dem Stift befestigte Rolle (16), dadurch gekennzeichnet, dass der Stift (14) gemäß einem Verfahren nach einem der vorhergehenden Ansprüche hergestellt ist.
  9. Vorrichtung nach Anspruch 8, wobei die Stiftenden in Durchgangsbohrungen verstemmt sind, die an dem Nockenkörper (12) vorgesehen sind.
  10. Vorrichtung nach Anspruch 8, ferner umfassend einen den Stift (14) haltenden Einsatz, während der Nockenkörper (12) den Einsatz hält, wobei die Stiftenden in Durchgangsbohrungen eingepresst sind, die an dem Einsatz vorgesehen sind.
EP15307020.6A 2015-12-16 2015-12-16 Verfahren zur herstellung eines stifts für nockenfolgerrollenvorrichtung Active EP3181838B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15307020.6A EP3181838B1 (de) 2015-12-16 2015-12-16 Verfahren zur herstellung eines stifts für nockenfolgerrollenvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15307020.6A EP3181838B1 (de) 2015-12-16 2015-12-16 Verfahren zur herstellung eines stifts für nockenfolgerrollenvorrichtung

Publications (2)

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EP3181838A1 EP3181838A1 (de) 2017-06-21
EP3181838B1 true EP3181838B1 (de) 2019-10-23

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19612969B4 (de) * 1996-04-01 2004-04-08 Ina-Schaeffler Kg Verfahren zur Herstellung eines Kipp- oder Schlepphebels eines Ventiltriebs einer Brennkraftmaschine
JP2003206708A (ja) * 2002-01-16 2003-07-25 Ntn Corp ローラ付きカムフォロア
JP2003343695A (ja) * 2002-05-28 2003-12-03 Koyo Seiko Co Ltd カムフォロワ
DE10315416A1 (de) * 2002-06-27 2004-01-22 Ina-Schaeffler Kg Lagefixierung eines Bolzens
JP4566036B2 (ja) * 2005-03-11 2010-10-20 Ｎｔｎ株式会社 転がり軸受
US7793583B2 (en) * 2006-12-06 2010-09-14 Schaeffler Kg Mechanical tappet in particular for a fuel pump of an internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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