EP1500797A1 - Arbre à cames - Google Patents

Arbre à cames Download PDF

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Publication number
EP1500797A1
EP1500797A1 EP03102263A EP03102263A EP1500797A1 EP 1500797 A1 EP1500797 A1 EP 1500797A1 EP 03102263 A EP03102263 A EP 03102263A EP 03102263 A EP03102263 A EP 03102263A EP 1500797 A1 EP1500797 A1 EP 1500797A1
Authority
EP
European Patent Office
Prior art keywords
cam
camshaft
partial
profile
cams
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.)
Withdrawn
Application number
EP03102263A
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German (de)
English (en)
Inventor
Michael Georg Figura
Torsten Kluge
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.)
Ford Global Technologies LLC
Original Assignee
Ford Global Technologies LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Priority to EP03102263A priority Critical patent/EP1500797A1/fr
Publication of EP1500797A1 publication Critical patent/EP1500797A1/fr
Withdrawn legal-status Critical Current

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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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0057—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by splittable or deformable 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
    • F01L1/08—Shape of cams

Definitions

  • the present invention relates to a camshaft having at least one two sub-cam comprehensive cam.
  • Task of a camshaft in an internal combustion engine is to open and closing the intake and exhaust valves of the cylinders cause.
  • the cams of the camshaft act directly or indirectly on valve tappets of the valves to this against the force of valve springs to open.
  • the opening time of the valves and their valve lift depend on the shape of the cams.
  • the opening and hanging hang Closing times of different valves relative to each other from the relative Arrangement of the cam on the camshaft, in particular the on and descending cam flanks, from.
  • DE 100 30 904 describes a camshaft with an axial bore, in which a second shaft is arranged.
  • a rotational movement of second wave can be the stroke of a cam of the camshaft targeted adjust.
  • the opening duration of the valve Simultaneously with the adjustment of the stroke, the opening duration of the valve.
  • the at least two mutually rotatable Part cam includes, the partial cam of a cam in each case a profile, the a profile range with a constant stroke, wherein the constant Hub for the profile areas of all partial cams of a cam is the same and especially the maximum stroke can correspond.
  • the twistability the partial cam against each other and the arrangement of the partial cams on the Camshaft are designed such that the partial cam of a cam between a relative position in which the profile areas with constant Stroke seen in the axial direction of the camshaft arranged one behind the other are, and a relative position in which the profile areas with constant Stroke seen in the axial direction of the camshaft substantially are arranged next to each other, let move.
  • the camshaft according to the invention makes it possible to open the duration of the Valves, d. H. the time of opening and / or closing, as well as the Duration of valve overlap to be influenced at constant stroke. If a long opening period is desired, the partial cams in the Position brought to each other, in the profile areas with constant stroke lie side by side in the axial direction of the camshaft. Thereby can the effect of a "broad” or “steeper” d. H. in Achieve circumferential direction of extended cam. The "widening" of the Cam also leads to a greater overlap of intake and Exhaust valve.
  • the Part cam in the position brought to each other, in the profile areas with constant stroke seen in the axial direction of the camshaft substantially arranged one behind the other. This can be the effect of a "narrow", d. H. achieve circumferentially narrow cam.
  • the constant same stroke of the profile areas of the partial cams of a cam can be realized in a structurally simple way by the fact that the Partial cams have a common axis of rotation to the one against the other Twisting takes place, and that the profile areas with constant stroke have a constant radius with respect to the common axis of rotation.
  • this includes at least one hollow shaft and one inside the at least one Hollow shaft arranged inner shaft.
  • Each partial cam is with one of the Firmly connected waves, and the at least one hollow shaft and the Inner shaft can be rotated against each other.
  • camshaft according to the invention have in the partial cams of a cam, the profile areas with constant Hub each at least one, in the circumferential direction of the camshaft projecting profile tab on.
  • the profile projections of the partial cams are in such a way matched to each other that they in the position in which the Profile areas seen with constant stroke in the axial direction of the camshaft lie one behind the other, interlock.
  • an inventive Camshaft with a cam comprising at least two sub-cams at least one hollow shaft and one inside the at least one Hollow shaft arranged inside shaft, whereby each partial cam with one of the Waves is firmly connected and wherein the at least one hollow shaft and the Inner shaft and thus the partial cams are rotated against each other.
  • the Camshaft according to this aspect of the invention is characterized from that the hollow shaft and the inner shaft in the axial direction against each other are displaceable, and that the partial cams designed and to the Shafts are fixed, that an axial displacement of the hollow shaft and the Inner shaft against each other a twisting of the waves and thus the Part cam caused against each other.
  • Camshaft can be the position of the part cam by a targeted axial Move the hollow and inner shaft relative to each other influence.
  • a rotary drive for example, a Variable timing camshaft structure (Variable Camshaft Timing, VCT), to adjust the phase relationship, i. the relative Twist, of hollow and inner shaft against each other, use.
  • VCT Variable Camshaft Timing
  • One Such drive usually rotates together with the camshaft.
  • the Attaching a rotating with the camshaft drive makes however major and costly changes in the head area of the engine or in the Cylinder head needed.
  • the contact surfaces have a shape which is designed such that they in an axial displacement of the hollow shaft and the inner shaft against each other cause a twisting of the partial cams against each other.
  • a helical formation of the contact surfaces is particularly suitable, for example, a helical formation of the contact surfaces.
  • the hollow shaft for the passage of the attached to the inner shaft part cam or a fastening element which fixes the partial cam to the inner shaft have a helical slot, which in particular as Guiding the attached to the inner shaft part cam can serve.
  • Figures 1 to 4 show a first embodiment of the invention
  • Camshaft which has a hollow shaft 3 and one inside the Hollow shaft 3 arranged inner shaft 4 includes and a cam with two having mutually pivotable part cam 1, 2.
  • the one Part cam 1 is connected to the hollow shaft 3 and the other part cam 2 with the Internal shaft 4 firmly connected, wherein the connected to the inner shaft 4 Part cam 2 or a part cam 2 with the inner shaft 4 fixed connecting fastener through a recess in the Circumferential wall of the hollow shaft 3 passes.
  • the partial cams can also be integral with the Be formed waves.
  • Hollow shaft 3 and inner shaft 4 can not by means of a in the figures shown rotary drive, about a common longitudinal axis A. be twisted against each other. The twisting of hollow shaft 3 and Inner shaft 4 by a certain angle leads to a Swiveling the two partial cams 1, 2 by this angle.
  • the one part cam 1 represents the opening of a valve enabling opening portion of the cam formed from the two part cam and the other part cam 2 whose closing the valve enabling closing section.
  • the two partial cams are therefore referred to below as the opening cam 1 and 2 closing cam.
  • the opening cam 1 has a cam profile with a rising edge 5
  • the closing cam 2 has a cam profile with a descending edge 6.
  • the cam profiles of the two partial cams also each have a subsequent to the rising or falling edge profile section 7, 8, the profile surface corresponds to a section of the lateral surface of a cylinder with a coincident with the longitudinal axis A of the camshaft cylinder axis.
  • this profile surface therefore corresponds to a circular section of the angle ⁇ 2 with a constant radius and the longitudinal axis A of the camshaft as the center (see FIG. 2).
  • the constant radius, which represents a constant stroke, and the angle ⁇ 2 of the circular section are the same for both partial cams 1, 2 of the cam.
  • the partial cams 1, 2 in the axial direction ie in the direction of the longitudinal axis A, a three-part structure.
  • the opening cam 1 has a centrally arranged in the axial direction and in the circumferential direction of the cam shaft over the entire circular section ⁇ 2 of the profile section 7 extending recess 9.
  • the recess extends in the axial direction approximately over a third of the opening cam 1.
  • the profile of the opening cam 1 at its axial ends in each case a profile projection, wherein the area between the profile projections forms the recess.
  • the closing cam 2 has two circumferentially over the entire circular section ⁇ 2 of the profile section 8 extending recesses 11, which are arranged at the two axial ends of the closing cam 8 and extend over approximately one third of its axial length, so that the Profile section 8 actually consists only of the projecting middle third of the closing cam 2.
  • the profile of the closing cam 2 has a profile projection which is arranged centrally in the axial direction of the cam and forms the profile section 8.
  • opening and closing cams 1, 2 are arranged relative to one another such that the tooth-like projecting middle third of the closing cam 2 engages completely in the recess 9 of the opening cam 1, then in that the profile sections 7, 8 are located one behind the other in the direction of the longitudinal axis A.
  • the cam formed from the opening and closing cams 1, 2 then has a profile section whose profile surface in the circumferential direction corresponds to a circular section of the angle ⁇ 2 with a constant radius and a center located on the longitudinal axis A of the camshaft.
  • the profile section, the profile surface in the circumferential direction of the camshaft is a circular section with a constant radius corresponds to a constant maximum stroke, wherein the angle ⁇ defines the duration of the maximum stroke at a constant rotational speed of the camshaft.
  • the angle ⁇ defines the duration of the maximum stroke at a constant rotational speed of the camshaft.
  • each partial cam can be over half of its own axial length extending bay and one over the other half having its axial length extending projection, wherein the bays and projections of partial cams of a cam so matched are that they can mesh.
  • the projections and recesses not to be rectangular, but can also have other geometric shapes, such as triangles or Hemispheres.
  • FIGS 6 to 9 show a second embodiment of the Camshaft according to the invention.
  • the camshaft again comprises a Hollow shaft 30 and disposed inside the hollow shaft 30 inner shaft 40 and has two mutually pivotable part cam 10, 20, the together form a cam.
  • the inner shaft 40 is opposite to the Hollow shaft 30 mounted both rotatable and displaceable.
  • the inner shaft 40 is connected to a translational drive, with the help of the Inner shaft 30 is to be moved relative to the hollow shaft 40.
  • translatory drive can be all common types of translational Drives, eg. Pneumatic or hydraulic actuating cylinder or Stellzylinderglobe, electric servomotors, artificial muscles or similar, find use.
  • As a drive for moving back the Inner shaft to the starting position can also spring elements come into use.
  • a partial cam 10 is the Opening a valve enabling opening portion of the two Part cam formed cam and the other part cam 20 of the Closing section.
  • the two partial cams 10, 20 are therefore again as Opening cam 10 and closing cam 20 denotes.
  • the closing cam 20 in the second embodiment not with the inner shaft 40 but with the hollow shaft 30th firmly connected or integrally formed with this.
  • the opening cam 10 with the inner shaft 40th firmly connected or formed in one piece Alternatively, however, could also as in the first embodiment, the closing cam 20 on the inner shaft 40 and the opening cam 10 may be arranged on the hollow shaft 30.
  • the hollow shaft 30 has in the region in which the lock cam 20 at the Inner shaft 40 is fixed, a recess 32 through which the Opening cam 10 or a fastener, with which he at the Inner shaft 40 is fixed, passes through the wall of the hollow shaft 30 therethrough.
  • the extent of the recess both in the axial direction and in Circumferential direction of the camshaft is greater than the extent of through they pass through cam portion or fastener, so in that it moves the cam in both axial and circumferential directions the hollow shaft 30 allows.
  • Opening and closing cam 10, 20 point in the circumferential direction of Camshaft on a profile that substantially the profile of the part cam in the first embodiment corresponds (Fig. 7 and 9). Both cams stand in the area of their cam profile, which is the maximum constant Hub corresponds, via contact surfaces 15, 25 with each other in sliding contact.
  • the Contact surfaces 15, 25 of the two partial cams 10, 20 are helical formed so that they at an axial displacement of the partial cam 10, 20th against each other a rotation of the partial cams 10, 20 against each other cause ( Figures 6 and 8).
  • the helical contact surfaces 15, 25 each extend in the maximum stroke of a sub-cam representing profile section over its entire axial extent.
  • the maximum stroke of Opening cam 10 and closing cam 20 represent, in the axial direction seen in the camshaft arranged one behind the other (Fig. 7), so that in the formed by the two partial cams 10, 20 cam profile section of maximum stroke has a small extent in the circumferential direction.
  • the Extension corresponds to the extent that the profile section with maximum stroke of a partial cam in the circumferential direction.
  • the hollow shaft 30 and the inner shaft 40 are in their in Axial direction maximum shifted position (Fig. 8), so are the two Part cam 10, 20 maximum rotated against each other (Fig. 9). It is the maximum possible displacement by suitable choice of dimensions the recess 32 is set such that in the rotated position of the Part cam 10, 20 their profile representing the maximum stroke profile sections 70, 80 seen in the axial direction almost completely next to each other are arranged (Fig. 9). In the of the two partial cam 10, 20 formed cam, the profile section with maximum stroke therefore in Circumferential direction of the camshaft on a large extent. The Expansion corresponds to almost twice the extent that the profile section with maximum stroke of a part cam in the circumferential direction having.
  • the camshaft described in the second embodiment can in the Most engines without major changes in the head area of the engine Application come.
  • the camshaft can be designed in this way be that the hollow shaft performs no axial movement.
  • To the axial Moving the inner shaft relative to the hollow shaft i.e., for lengthening the opening duration of the valve) can in the housing of the valve gear on whose rear end a hydraulic cylinder be arranged, the piston acting on the inner shaft.
  • the flow of oil into and out of the hydraulic cylinder can be controlled by means of a solenoid valve.
  • To reset the Inner shaft (or to shorten the opening time) can in the front end the hollow shaft may be arranged a return spring.
  • the axial extent of the formed from the cam parts Total cam should therefore preferably be greater than the axial Extension of an integrally formed cam.
  • the axial extent be chosen so that even at maximum rotation the partial cam against each other, the axial overlap is sufficient to a to achieve safe actuation of the valve stem.
  • a movement of the arranged on the inner shaft 40 part cam allows both in the axial and in the circumferential direction and at the same time as Guiding the partial cam is used.
EP03102263A 2003-07-23 2003-07-23 Arbre à cames Withdrawn EP1500797A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03102263A EP1500797A1 (fr) 2003-07-23 2003-07-23 Arbre à cames

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03102263A EP1500797A1 (fr) 2003-07-23 2003-07-23 Arbre à cames

Publications (1)

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EP1500797A1 true EP1500797A1 (fr) 2005-01-26

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EP03102263A Withdrawn EP1500797A1 (fr) 2003-07-23 2003-07-23 Arbre à cames

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EP (1) EP1500797A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7819100B2 (en) * 2006-12-20 2010-10-26 C.R.F. Societa Consortile Per Azioni Internal combustion engine with intake valves having a variable actuation and a lift profile including a constant lift boot portion
WO2011032632A1 (fr) 2009-09-16 2011-03-24 Thyssenkrupp Presta Teccenter Ag Arbre à cames à durée d'ouverture de soupapes variable
DE102010023571A1 (de) 2010-06-12 2011-12-15 Thyssenkrupp Presta Teccenter Ag Gebaute Nockenwelle
EP2574744A1 (fr) 2011-09-30 2013-04-03 Thyssenkrupp Presta Teccenter Ag Commande de soupape pour moteurs à combustion interne avec arbre à came réglable
DE102013020923A1 (de) * 2013-12-11 2015-06-11 Daimler Ag Kolbenmotor und zugehöriges Betriebsverfahren
DE102014225054A1 (de) * 2014-12-05 2016-06-09 Mahle International Gmbh Verstellbare Nockenwelle
DE102015203391A1 (de) * 2015-02-25 2016-08-25 Mahle International Gmbh Verstellbare Nockenwelle
CN107559062A (zh) * 2017-09-06 2018-01-09 陆逸钧 可变气门开启时长机构
DE102011051353B4 (de) * 2010-12-06 2021-03-04 Hyundai Motor Co. Variable Ventiltriebvorrichtung
CN114148738A (zh) * 2021-12-10 2022-03-08 广东华工环源环保科技有限公司 一种蛋托输送挡料装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR517937A (fr) * 1920-06-25 1921-05-17 Placide Leon Chion Perfectionnements aux cames particulièrement applicables au réglage de la distribution des moteurs à explosions
US1757046A (en) * 1929-02-27 1930-05-06 Int Motor Co Variable nose cam
DE4215057A1 (de) * 1992-05-07 1993-11-11 Audi Ag Nockenwelle
DE4403426A1 (de) * 1993-02-13 1994-08-18 Audi Ag Verstellvorrichtung für zumindest einen Nocken
JPH0754623A (ja) * 1993-08-09 1995-02-28 Toyota Motor Corp 可変バルブタイミング装置
WO1999036677A1 (fr) * 1998-01-19 1999-07-22 Darut Pty. Ltd. Cames et suiveurs de cames de moteurs

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR517937A (fr) * 1920-06-25 1921-05-17 Placide Leon Chion Perfectionnements aux cames particulièrement applicables au réglage de la distribution des moteurs à explosions
US1757046A (en) * 1929-02-27 1930-05-06 Int Motor Co Variable nose cam
DE4215057A1 (de) * 1992-05-07 1993-11-11 Audi Ag Nockenwelle
DE4403426A1 (de) * 1993-02-13 1994-08-18 Audi Ag Verstellvorrichtung für zumindest einen Nocken
JPH0754623A (ja) * 1993-08-09 1995-02-28 Toyota Motor Corp 可変バルブタイミング装置
WO1999036677A1 (fr) * 1998-01-19 1999-07-22 Darut Pty. Ltd. Cames et suiveurs de cames de moteurs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 05 30 June 1995 (1995-06-30) *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7819100B2 (en) * 2006-12-20 2010-10-26 C.R.F. Societa Consortile Per Azioni Internal combustion engine with intake valves having a variable actuation and a lift profile including a constant lift boot portion
US8820281B2 (en) 2009-09-16 2014-09-02 Thyssenkrupp Presta Teccenter Ag Camshaft with variable valve opening period
CN102575536B (zh) * 2009-09-16 2014-11-05 蒂森克虏伯普里斯塔技术中心股份公司 具有可变化的阀门开启时长的凸轮轴
DE102009041426A1 (de) 2009-09-16 2011-05-19 Thyssenkrupp Presta Teccenter Ag Nockenwelle mit variierbarer Ventilöffnungsdauer
WO2011032632A1 (fr) 2009-09-16 2011-03-24 Thyssenkrupp Presta Teccenter Ag Arbre à cames à durée d'ouverture de soupapes variable
CN102575536A (zh) * 2009-09-16 2012-07-11 蒂森克虏伯普里斯塔技术中心股份公司 具有可变化的阀门开启时长的凸轮轴
DE102010023571A1 (de) 2010-06-12 2011-12-15 Thyssenkrupp Presta Teccenter Ag Gebaute Nockenwelle
DE102010023571B4 (de) * 2010-06-12 2016-09-15 Thyssenkrupp Presta Teccenter Ag Gebaute Nockenwelle
US8631776B2 (en) 2010-06-12 2014-01-21 Thyssenkrupp Presta Teccenter Ag Assembled camshaft
DE102011051353B4 (de) * 2010-12-06 2021-03-04 Hyundai Motor Co. Variable Ventiltriebvorrichtung
DE102011114588A1 (de) 2011-09-30 2013-04-04 Thyssenkrupp Presta Teccenter Ag Ventiltrieb für Brennkraftmaschinen mit verstellbarer Nockenwelle
EP2574744A1 (fr) 2011-09-30 2013-04-03 Thyssenkrupp Presta Teccenter Ag Commande de soupape pour moteurs à combustion interne avec arbre à came réglable
DE102013020923A1 (de) * 2013-12-11 2015-06-11 Daimler Ag Kolbenmotor und zugehöriges Betriebsverfahren
US9903240B2 (en) 2014-12-05 2018-02-27 Mahle International Gmbh Adjustable camshaft
DE102014225054A1 (de) * 2014-12-05 2016-06-09 Mahle International Gmbh Verstellbare Nockenwelle
DE102015203391A1 (de) * 2015-02-25 2016-08-25 Mahle International Gmbh Verstellbare Nockenwelle
CN107559062A (zh) * 2017-09-06 2018-01-09 陆逸钧 可变气门开启时长机构
CN107559062B (zh) * 2017-09-06 2020-04-07 陆逸钧 可变气门开启时长机构
CN114148738A (zh) * 2021-12-10 2022-03-08 广东华工环源环保科技有限公司 一种蛋托输送挡料装置

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