EP2853697A1 - Mechanisches System, Einspritzpumpe und Ventilaktor mit einem solchen mechanischen System und Herstellungsverfahren - Google Patents

Mechanisches System, Einspritzpumpe und Ventilaktor mit einem solchen mechanischen System und Herstellungsverfahren Download PDF

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Publication number
EP2853697A1
EP2853697A1 EP13186504.0A EP13186504A EP2853697A1 EP 2853697 A1 EP2853697 A1 EP 2853697A1 EP 13186504 A EP13186504 A EP 13186504A EP 2853697 A1 EP2853697 A1 EP 2853697A1
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EP
European Patent Office
Prior art keywords
mechanical system
axis
support element
pin
previous
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
Application number
EP13186504.0A
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English (en)
French (fr)
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EP2853697B1 (de
Inventor
Nicolas Berruet
Charles Chambonneau
Benoît HAUVESPRE
Samuel Viault
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SKF AB
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SKF AB
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Priority to EP13186504.0A priority Critical patent/EP2853697B1/de
Publication of EP2853697A1 publication Critical patent/EP2853697A1/de
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Publication of EP2853697B1 publication Critical patent/EP2853697B1/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
    • F01L1/14—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
    • 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
    • F01L1/143—Tappets; Push rods for use with overhead camshafts

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 an 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 support element defining two bores centered on first axis, 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 mechanical system comprises at least one antirotation device integrally formed with the support element.
  • the mechanical system is provided with anti-rotation function without using an additional part.
  • Design of the mechanical system and its assembly are simplified.
  • 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 moulding, stamping or machining.
  • the mechanical system 1 represented on figures 1 to 5 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, a pin 30, a roller 40, a bearing 50 and an insert 60.
  • 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.
  • the tappet 10 comprises a first cylindrical portion 11, a second cylindrical portion 12 and a central radial portion 13 interposed between portions 11 and 12.
  • Tappet 10 also comprises a bearing portion 20 extending from portion 12 opposite portions 11 and 13.
  • Cylindrical portion 11 has a cylindrical inner bore 16 delimiting a cavity 17 inside tappet 10. This cavity 17 is adapted to receive a shaft, not shown, for moving tappet 10 along axis Y1.
  • Cylindrical portion 12 delimits another cavity 19 inside tappet 10, partly receiving pin 30, roller 40 and bearing 50.
  • Portion 13 comprises plane surfaces 14a and curved surfaces 14b surrounding insert 60.
  • Four holes 15 extend through portion 13 parallel to axis Y1, connecting cavities 17 and 19, to allow a flow of lubricant therebetween.
  • Tappet 10 has a cylindrical outer surface 18, with a circular basis, centered on axis Y1 and extending along both portions 11 and 12.
  • Tappet 10 is movable back and forth along axis Y1, in a non-represented bore belonging to the injection pump, with surface 18 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 flow and temperature variations.
  • tappet 10 forms a support element for pin 30, roller 40 and bearing 50.
  • bearing portion 20 of tappet 10 is adapted to receive pin 30, on which roller 40 and bearing 50 are mounted.
  • bearing portion 20 comprises two lateral flanges 24 and 25 extending from portion 12 parallel to axis Y1 in a bifurcated manner, on both side of axis Y1.
  • the flanges 24 and 25 delimit between them an intermediate gap 23 joining cavity 19.
  • each lateral flange 24 and 25 includes a cylindrical bore, respectively 26 and 27. Both bores 26 and 27 extend through flanges 24 and 25 along same axis X1. Bores 26 and 27 are centered on axis X1 and have the same diameter.
  • Hollow sections 28 and 29 are formed on portion 12, in the prolongation of bores 26 and 27 on the outside of flange 24 and 25, to facilitate insertion of pin 30 into bores 26 and 27.
  • Pin 30 comprises a cylindrical surface 32 extending between two pin ends 36 and 37.
  • pin ends 36 and 37 are adapted to be caulked by press-fit, respectively in bores 26 and 27.
  • 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 36 and 37 may be subjected to an electromagnetic induction heating 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.
  • Rolling bearing 50 comprises a series of needles 52 extending parallel to axis X1 and distributed regularly around axis X1. Rolls 52 are interposed between surface 32 of pin 30 and surface 42 of roller 40.
  • insert 60 is preferably made of stamped metal sheet and assembled with tappet 10 by overmolding.
  • Insert 60 comprises a plane central portion 61 and two plane lateral portions 62 and 63.
  • Insert 60 comprises a curved portion 64 connecting portions 61 and 62 and a curved portion 65 connecting portions 61 and 63.
  • Curved portions 64 and 65 are in contact with curved surfaces 14b of central portion 13.
  • Insert 60 comprises a half-cylindrical section 66 which is formed on portion 62 in the prolongation of section 28 and which supports end 36 of pin 30 together with bore 26.
  • Insert 60 comprises a half-cylindrical section 67 which is formed on portion 63 in the prolongation of section 29 and which supports end 37 of pin 30 together with bore 27.
  • Central portion 61 comprises lateral plane surfaces 68 in contact with plane surfaces 14a of central portion 13.
  • Roller 40 and rolling bearing 50 are positioned in mechanical system 1 before pin 30, more precisely in the intermediate gap 23 between the two flanges 24 and 25. Then pin 30 is inserted inside bores 26 and 27 of tappet 10, inside sections 66 and 67 of insert 60 and inside rolling bearing 50. Finally pin ends 36 and 37 are caulked by press-fit in bores 26 and 27. At this stage, 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.
  • Insert 60 is more resistant than flanges 24 and 25 to load transmitted from roller 40, in other words insert 60 increases mechanical resistance of system 1.
  • system 1 comprises an antirotation device 80 integrally formed with tappet 10, on its outer surface 18.
  • Device 80 is a pin protruding from surface 18 along a direction parallel to an axis Z1 perpendicular to axes X1 and Y1.
  • Pin 80 has an outer surface 82 having a rounded shape in a sectional plane perpendicular to axis Y1, as shown on figure 2 .
  • Surface 82 cooperates with a non-represented guiding groove, formed in the bore surrounding the tappet.
  • pin 80 prevents tappet 10 from rotating in this bore around axis Y1.
  • Pin 80 extends along axis Y1 between two extremities 84 and 86, each having a rounded shape in a sectional plane comprising axis Y1 and Z1.
  • extremities 84 and 86 may form end stops adapted to abut against extremities of the guiding groove or of another part.
  • pin 80 is closer to aperture of cavity 19 than to aperture of cavity 17.
  • pin 80 is moulded as one single part together with tappet 10.
  • pin 80 may be formed by plastic deformation of tappet 10, for example by punching from inside cavity 17 of tappet 10, with a punch applied to bore 16 and deforming part 11.
  • pin 80 may be machined in the mass tappet 10.
  • Tappet 110 comprises an antirotation pin 180 which is closer to aperture of cavity 17 than to aperture of cavity 19.
  • position of the antirotation pin depends on position and extent of the guiding groove formed in bore surrounding the tappet.
  • Tappet 210 comprises two antirotation pins 80 and 180 which are aligned parallel to axis Y1. Thus, pins 80 and 180 can be positioned in the same groove formed in bore surrounding tappet 210.
  • a fourth embodiment of the invention is represented on figure 8 .
  • Tappet 210 comprises an antirotation pin 380 which is a bar extending parallel to axis Y1.
  • bar 380 extends along almost 80% of the length of outer surface 18 of tappet 310, measured parallel to axis Y1.
  • bar 380 extends along at least 50% of the length of outer surface 18.
  • support element 10 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) 80 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.
  • insert 60 is machined then positioned inside tappet 10.
  • system 1 comprises two antirotation devices 80 protruding from surface 18 and diametrically opposed relative to axis Y1.
  • surface 82 may have a triangular or rectangular shape in a sectional plane perpendicular to axis Y1.
  • system 1 comprises at least one antirotation device integrally formed with a support element such as the tappet 10, 110, 210 or 310.
  • This antirotation device is adapted to fit and slide in a groove surrounding the support element.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP13186504.0A 2013-09-27 2013-09-27 Mechanisches System, Einspritzpumpe und Ventilaktor mit einem solchen mechanischen System und Herstellungsverfahren Active EP2853697B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13186504.0A EP2853697B1 (de) 2013-09-27 2013-09-27 Mechanisches System, Einspritzpumpe und Ventilaktor mit einem solchen mechanischen System und Herstellungsverfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13186504.0A EP2853697B1 (de) 2013-09-27 2013-09-27 Mechanisches System, Einspritzpumpe und Ventilaktor mit einem solchen mechanischen System und Herstellungsverfahren

Publications (2)

Publication Number Publication Date
EP2853697A1 true EP2853697A1 (de) 2015-04-01
EP2853697B1 EP2853697B1 (de) 2016-04-27

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107345491A (zh) * 2016-05-04 2017-11-14 斯凯孚公司 凸轮从动辊设备
WO2017181002A3 (en) * 2016-04-15 2017-11-23 Koyo Bearings North America Llc Tappet with inner cup received on pallet
US11143059B2 (en) 2019-10-03 2021-10-12 Koyo Bearings North America Llc Tappet assembly with unground outer cup
US11149593B2 (en) 2019-10-03 2021-10-19 Koyo Bearings North America Llc Tappet assembly with formed anti-rotation alignment device

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191119321A (en) * 1910-09-09 Leis Roman Improvements in and relating to Ball Bearings.
US3668945A (en) * 1969-03-18 1972-06-13 Bosch Gmbh Robert Roller tappet guard
JP2001329809A (ja) * 2000-05-22 2001-11-30 Otics Corp バルブリフタ及び動弁機構
WO2002020953A1 (de) * 2000-09-09 2002-03-14 Mahle Ventiltrieb Gmbh Rollenstössel für einen verbrennungsmotor
US20050235932A1 (en) * 2004-04-23 2005-10-27 Albertson William C Hybrid metal-composite valve lifter guide
EP1669556A1 (de) * 2004-11-17 2006-06-14 JTEKT Corporation Wälzlager eines Kipphebels
WO2006083102A1 (en) * 2005-02-02 2006-08-10 Seok Ki Yun Inline skates having straight drive type joint structure
US7210437B2 (en) 2004-07-24 2007-05-01 Ina-Schaeffler Kg Periodically actuable tappet for a valve train or a pump drive
US20080190237A1 (en) 2006-12-06 2008-08-14 Schaeffler Kg Mechanical tappet in particular for a fuel pump of an internal combustion engine
WO2010048968A1 (en) 2008-10-27 2010-05-06 Ab Skf Antirotation device
EP2607636A1 (de) * 2011-12-23 2013-06-26 Aktiebolaget SKF Mechanisches System, Einspritzpumpe mit solch einem mechanischen System und Verfahren zur Herstellung solch eines mechanischen Systems

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191119321A (en) * 1910-09-09 Leis Roman Improvements in and relating to Ball Bearings.
US3668945A (en) * 1969-03-18 1972-06-13 Bosch Gmbh Robert Roller tappet guard
JP2001329809A (ja) * 2000-05-22 2001-11-30 Otics Corp バルブリフタ及び動弁機構
WO2002020953A1 (de) * 2000-09-09 2002-03-14 Mahle Ventiltrieb Gmbh Rollenstössel für einen verbrennungsmotor
US20050235932A1 (en) * 2004-04-23 2005-10-27 Albertson William C Hybrid metal-composite valve lifter guide
US7210437B2 (en) 2004-07-24 2007-05-01 Ina-Schaeffler Kg Periodically actuable tappet for a valve train or a pump drive
EP1669556A1 (de) * 2004-11-17 2006-06-14 JTEKT Corporation Wälzlager eines Kipphebels
WO2006083102A1 (en) * 2005-02-02 2006-08-10 Seok Ki Yun Inline skates having straight drive type joint structure
US20080190237A1 (en) 2006-12-06 2008-08-14 Schaeffler Kg Mechanical tappet in particular for a fuel pump of an internal combustion engine
WO2010048968A1 (en) 2008-10-27 2010-05-06 Ab Skf Antirotation device
EP2607636A1 (de) * 2011-12-23 2013-06-26 Aktiebolaget SKF Mechanisches System, Einspritzpumpe mit solch einem mechanischen System und Verfahren zur Herstellung solch eines mechanischen Systems

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017181002A3 (en) * 2016-04-15 2017-11-23 Koyo Bearings North America Llc Tappet with inner cup received on pallet
EP3734028A1 (de) * 2016-04-15 2020-11-04 Koyo Bearings North America LLC Stössel mit innenschale auf einer palette
US11215269B2 (en) 2016-04-15 2022-01-04 Koyo Bearings North America Llc Tappet with inner cup received on pallet
CN107345491A (zh) * 2016-05-04 2017-11-14 斯凯孚公司 凸轮从动辊设备
CN107345491B (zh) * 2016-05-04 2021-04-16 斯凯孚公司 凸轮从动辊设备
US11143059B2 (en) 2019-10-03 2021-10-12 Koyo Bearings North America Llc Tappet assembly with unground outer cup
US11149593B2 (en) 2019-10-03 2021-10-19 Koyo Bearings North America Llc Tappet assembly with formed anti-rotation alignment device

Also Published As

Publication number Publication date
EP2853697B1 (de) 2016-04-27

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