EP2529088B1 - Cam follower for actuating a gas exchange valve - Google Patents

Cam follower for actuating a gas exchange valve Download PDF

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Publication number
EP2529088B1
EP2529088B1 EP10779830.8A EP10779830A EP2529088B1 EP 2529088 B1 EP2529088 B1 EP 2529088B1 EP 10779830 A EP10779830 A EP 10779830A EP 2529088 B1 EP2529088 B1 EP 2529088B1
Authority
EP
European Patent Office
Prior art keywords
cam
roller
bearing
characterized
cam follower
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
EP10779830.8A
Other languages
German (de)
French (fr)
Other versions
EP2529088A1 (en
Inventor
Stephan Möck
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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
Priority to DE102010005606A priority Critical patent/DE102010005606A1/en
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to PCT/EP2010/068277 priority patent/WO2011088924A1/en
Publication of EP2529088A1 publication Critical patent/EP2529088A1/en
Application granted granted Critical
Publication of EP2529088B1 publication Critical patent/EP2529088B1/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12Transmitting gear between valve drive and valve
    • F01L1/18Rocking arms or levers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12Transmitting gear between valve drive and valve
    • F01L1/18Rocking arms or levers
    • F01L1/185Overhead end-pivot rocking arms
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015Modifications 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
    • F01L13/0036Modifications 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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2105/00Valve arrangements comprising rollers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/20Control lever and linkage systems
    • Y10T74/20576Elements
    • Y10T74/20882Rocker arms
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/21Elements
    • Y10T74/2101Cams
    • Y10T74/2107Follower

Description

    Field of the invention
  • The invention relates to a cam follower for actuating a gas exchange valve of an internal combustion engine, comprising a housing and a cam roller mounted in a recess of the housing for tapping a cam of a camshaft. The cam roller is radially supported by means of a needle bearing running in its bearing bore on a pin spanning the recess and supported on the housing, and the width of the needle bearing is significantly greater than the width of the cam roller in the region of the cam tappet.
  • Background of the invention
  • A cam follower with such a cam roller is considered from the generic DE 101 21 798 A1 is known and is particularly suitable for use in variable stroke valve trains with axially displaceable cam groups whose different cam lobes are selectively transmitted by means of the cam follower on the gas exchange valve. In order to ensure the necessary clearance of an adjacent, ie not currently engaged with the cam roller cam against the cam roller and at the same time that the Hertzian pressure in the needle bearing does not exceed the allowable load limits, corresponds to the width of the cam roller in the region of the cam tap in the essentially the width of a cam and in the region of the needle bearing whose width is significantly greater than the width of a cam. In other words, the known from the cited prior art cam follower is provided with a stepped on both sides in diameter cam roller whose diameter stages have a correspondingly large width.
  • Object of the invention
  • Object of the present invention is to provide a cam follower of the type mentioned with a manufacturing technology favorable cam roller.
  • Summary of the invention
  • The solution of this problem arises from the characterizing features of claim 1, while advantageous developments and refinements of the invention are the dependent claims can be removed. Accordingly, the width of the needle bearing should be clearly and expediently 30% to 60% greater than the width of the cam roller in the bearing bore and significantly larger than the clear distance of Rollenanlaufflächen which limit the recess and where the cam roller starts axially with their faces. Unlike in the cited prior art, it is thus envisaged that the cageless full complement or cage-guided needle bearing protrudes from the bearing bore. The basis for this embodiment according to the invention is the fact that the Hertzian stresses on the comparatively strongly curved inner race are significantly greater than on the comparatively slightly curved outer race of the needle bearing, so that the width of the cam roller in the region of the bearing bore, i. the width of the outer race, significantly smaller than the width of the needle bearing, which is decisive for the Hertzian pressure, i. the width of the inner race, can be dimensioned.
  • In the manufacturing technology particularly preferred case, the cam roller should have flat end faces. This means that the cam roller has the same width in the area of the cam tap and in the area of the bearing bore and, apart from transitional chamfers or fillets to the cam tap face and the bearing bore, has no production-consuming diameter steps.
  • The axial guidance of the cam roller within the recess takes place by roller contact surfaces, whose clear distance is significantly smaller than the width of the needle bearing and is selected so that the cam roller is mounted with predetermined axial play in the recess. The roller abutment surfaces are preferably positioned so that the cam roller and the needle bearing have a common transverse symmetry plane. Neglecting the axial play of the needle bearing and the cam roller means that the axial projection of the needle bearing from the bearing bore is identical on both faces of the cam roller. Alternatively, however, the roller contact surfaces can also be positioned so that the cam roller eccentrically rotates with respect to the needle bearing, so that, for example, the needle bearing protrudes from the bearing bore only on that end side of the cam roller on which clearance for an adjacent cam is required.
  • The needle bearing can roll either directly on the bearing pin or on a recorded on the bearing pin bearing bush, which is preferably received radially slidably on the bearing pin.
  • The cam follower is a linearly guided ram or a tilting, oscillating or drag lever mounted centrally or end pivotally mounted. In the case of the rocker arm whose elongated housing at its first end portion a socket for receiving a condyle of the rocker pivotally supporting support member, at its second end portion an actuating surface for the gas exchange valve and in its central portion of the recess two limiting and the bearing pin supporting housing sections should where the roller contact surfaces run.
  • With regard to favorable production costs, the housing should be a sheet-metal forming part with a U-shaped cross-sectional profile which is composed of side walls extending on both sides of the cam roller and a bottom connecting the side walls with the joint socket and the actuating surface. In this case, the bottom is provided with an opening for the cam roller, and the Rollenanlaufflächen are formed by extending in the longitudinal direction of the housing portions inner edges of the opening. In an alternative embodiment, the roller contact surfaces are by punctual elevations on the facing each other Inner sides of the side walls formed. While a survey for the axial guidance of the cam roller is sufficient per side wall, more surveys per side wall can be provided. The elevations expediently produced by embossing the side walls can be in point or surface contact with the end faces of the cam roller.
  • The U-shaped cross-sectional profile is preferably oriented such that, with respect to the bottom, the side walls and the socket rise in the same direction. In other words, the U-profile of the cam follower is closed to the gas exchange valve. Alternatively, it is also possible to provide a U-profile (inverse U-profile) which is open toward the gas exchange valve, in which the side walls and the socket rise in opposite directions.
  • Brief description of the drawings
  • Further features of the invention will become apparent from the following description and from the drawings, in which the invention is illustrated by the example of two rocker arms. Show it:
  • FIG. 1
    the first rocker arm in a perspective view obliquely from above;
    FIG. 2
    the first rocker arm in a perspective view obliquely from below;
    FIG. 3
    the first drag lever in bottom view;
    FIG. 4
    the cam roller bearing of the finger follower as a detail in perspective view;
    FIG. 5
    the cam roller bearing according to FIG. 4 in plan view and
    FIG. 6
    the housing of the second rocker arm in cross section.
    Detailed description of the drawings
  • In the FIGS. 1 to 3 a first embodiment of a cam follower according to the invention for a gas exchange valve drive of an internal combustion engine is disclosed in various views. Trained as a follower lever 1 cam follower comprises an elongated housing 2, which is made of sheet metal material in a cold forming process, and a cam roller 3, which is mounted in a recess 4 of the housing 2 and serves for low-friction picking a cam of a camshaft. The housing 2 has at its first end portion a dome-shaped socket 5 for receiving a spherical condyle of a rocker arm 1 pivotally supporting support member at its second end portion an actuating surface 6 for a gas exchange valve and in its central portion two the recess 4 limiting housing sections 7, in which a bearing pin 8 spanning the recess 4 and supporting the cam roller 3 radially is supported by means of end caulking.
  • The housing 2 has a U-shaped cross-sectional profile, which consists of both sides of the cam roller 3 extending side walls 9 and the side walls 9 connecting bottom 10 with the joint socket 5 and the actuating surface 6. The cross-sectional profile is closed to the gas exchange valve and thus oriented so that rise with respect to the bottom 10, the side walls 9 and the socket 5 in the same direction. The bottom 10 is provided with an opening 11 for the cam roller 3.
  • According to FIG. 4 takes place the bearing of the cam roller 3 on the bearing pin 8 both by means of a full complement, ie cageless needle bearing 12 whose outer race is formed by the bearing bore 13 of the cam roller 3, as well as by means of a bearing bush 14 which is radially slidably received on the bearing pin 8 and the Inner raceway of the needle bearing 12 forms. Out FIG. 5 It is clear that the width B1 of the needle bearing 12 is not only significantly greater than the width B2 of the cam roller 3 in the region of the Nockenabgriffs, ie the width of its outer circumferential surface 15, but also significantly greater than the same width B2 of the cam roller 3 in the region of its bearing bore 13 , so that the needle bearing 12 and the bearing bush 14 with respect to the end faces 16 of the cam roller formed just here 3 protruding. In the present case, B1 is about 40% larger than B2.
  • In the FIG. 3 shown dimensioning shows that the width B1 of the inside of the side walls 9 incoming needle bearing 12 is also significantly larger than the clear distance B3 of Rollenanlaufflächen 17 at which the cam roller 3 starts axially with their end faces 16. The roller contact surfaces 17 are formed by the longitudinal edges of the housing sections 7 extending inner edges of the opening 11 and positioned so that the cam roller 3, the needle bearing 12 and the bearing bush 14 have a common transverse symmetry plane. Neglecting the respective axial play (the axial play of the cam roller 3 in the recess 4 is given by the difference B3-B2), this means that the projection of the needle bearing 12 and the bearing bush 14 from the bearing bore 13 at both end faces 16 of the cam roller 3 is identical ,
  • A second embodiment of a cam follower according to the invention is made FIG. 6 shows, in which only the housing 2 'of the cam follower also designed as a follower lever 1' is shown in cross section. The drag lever 1 'differs from the drag lever 1 only by the Rollenanlaufflächen 17', which are formed in this case by embossed punctiform elevations on the mutually facing inner sides of the side walls 9 '.
  • A further, but not shown alternative with respect to the roller contact surfaces is that the distance of the side walls 9 not at the second end portion of the housing 2, (as in FIG. 3 shown), but already in its middle section to the width B3 to zoom out. In this case, the end faces 16 of the cam roller 3 would start axially against the converging inner sides of the side walls.
  • List of reference numbers
  • 1
    Cam follower / drag lever
    2
    casing
    3
    cam roller
    4
    recess
    5
    socket
    6
    actuating surface
    7
    housing section
    8th
    bearing bolt
    9
    Side wall
    10
    ground
    11
    opening
    12
    needle roller bearings
    13
    bearing bore
    14
    bearing bush
    15
    Outer lateral surface of the cam roller
    16
    Face of the cam roller
    17
    Role stop face
    B1
    Width of the needle bearing
    B2
    Width of the cam roller
    B3
    clear distance of the roller contact surfaces

Claims (10)

  1. Cam follower (1, 1') for actuating a gas exchange valve of an internal combustion engine with a housing (2, 2') and a cam roller (3) mounted in a recess (4) of the housing (2, 2') for disengaging a cam of a cam shaft, wherein the cam roller (3) is mounted radially by means of a needle bearing (12) running in the bearing bore (13) thereof on a bearing journal (8) which spans the recess (4) and rests on the housing (2, 2'), and the width (B1) of the needle bearing (12) is significantly greater than the width (B2) of the cam roller (3) in the legion of the cam disengagement, characterized in that the width (B1) of the needle bearing (12) is significantly greater than the width (B2) of the cam roller (3) in the region of the bearing bore (13) and significantly greater than the clear space (B3) between the roller contact surfaces (17, 17') which delimit the recess (4) and on which the cam roller (3) runs axially with its end faces (16).
  2. Cam follower according to Claim 1, characterized in that the end faces (16) of the cam roller (3) are formed flat.
  3. Cam follower according to Claim 1, characterized in that the roller contact surfaces (17, 17') are positioned so that the cam roller (3) and the needle bearing (12) have a common transverse plane of symmetry,
  4. Cam follower according to Claim 1, characterized in that the width (B1) of the needle bearing (12) is 30% to 60% greater than the width (B2) of the cam roller (3) in the region of the bearing bore (13).
  5. Cam follower according to Claim 1, characterized in that the needle bearing (12) rolls on a bearing bush (14) held on the bearing journal (8).
  6. Cam follower according to Claim 5, characterized in that the bearing bush (14) is held radially sliding on the bearing journal (8).
  7. Cam follower according to Claim 1, characterized in that the cam follower is formed as a finger follower (1), the linear housing (2) of which on its first end segment comprises a ball socket (5) for holding a ball head of a supporting element pivotably supporting the finger follower (1), on its second end segment an actuating surface (6) for the gas exchange valve and in its middle segment two housing segments (7) which delimit the recess (4) and support the bearing journal (8) and on which run the roller contact surfaces (17).
  8. Cam follower according to Claim 7, characterized in that the housing (2) is a sheet metal molding with a U-shaped cross section profile which is composed of side walls (9) running on both sides of the cam roller (3) and a base (10) connecting the side walls (9), with the ball socket (5) and the actuating surface (6), wherein the base (10) has an opening (11) for the cam roller (3) and the roller contact surfaces (17) are formed by the inner edges of the opening (11) running in the longitudinal direction of the housing segments (7).
  9. Cam follower according to Claim 7, characterized in that the housing (2') is a sheet metal molding with a U-shaped cross section profile which is composed of side walls (9') running on both sides of the cam roller (3) and a base (10) connecting the side walls (9'), with the ball socket (5) and the actuating surface (6), wherein the roller contact surfaces (17') are formed by spot protrusions on the mutually facing insides of the side walls (9').
  10. Cam follower according to Claim 8 or 9, characterized in that the U-shaped cross section profile is oriented so that in relation to the base (10), the side walls (9, 9') and the ball socket (5) protrude in the same direction.
EP10779830.8A 2010-01-25 2010-11-26 Cam follower for actuating a gas exchange valve Active EP2529088B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102010005606A DE102010005606A1 (en) 2010-01-25 2010-01-25 Cam follower for actuating a gas exchange valve
PCT/EP2010/068277 WO2011088924A1 (en) 2010-01-25 2010-11-26 Cam follower for actuating a gas exchange valve

Publications (2)

Publication Number Publication Date
EP2529088A1 EP2529088A1 (en) 2012-12-05
EP2529088B1 true EP2529088B1 (en) 2015-01-07

Family

ID=43479260

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10779830.8A Active EP2529088B1 (en) 2010-01-25 2010-11-26 Cam follower for actuating a gas exchange valve

Country Status (8)

Country Link
US (1) US8656878B2 (en)
EP (1) EP2529088B1 (en)
JP (1) JP5808343B2 (en)
KR (1) KR101701550B1 (en)
CN (1) CN102725484B (en)
DE (1) DE102010005606A1 (en)
MX (1) MX2012007777A (en)
WO (1) WO2011088924A1 (en)

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US9581058B2 (en) 2010-08-13 2017-02-28 Eaton Corporation Development of a switching roller finger follower for cylinder deactivation in internal combustion engines
US10415439B2 (en) 2008-07-22 2019-09-17 Eaton Intelligent Power Limited Development of a switching roller finger follower for cylinder deactivation in internal combustion engines
US9194261B2 (en) 2011-03-18 2015-11-24 Eaton Corporation Custom VVA rocker arms for left hand and right hand orientations
US9938865B2 (en) 2008-07-22 2018-04-10 Eaton Corporation Development of a switching roller finger follower for cylinder deactivation in internal combustion engines
US10087790B2 (en) 2009-07-22 2018-10-02 Eaton Corporation Cylinder head arrangement for variable valve actuation rocker arm assemblies
US9016252B2 (en) 2008-07-22 2015-04-28 Eaton Corporation System to diagnose variable valve actuation malfunctions by monitoring fluid pressure in a hydraulic lash adjuster gallery
US9885258B2 (en) 2010-03-19 2018-02-06 Eaton Corporation Latch interface for a valve actuating device
US9291075B2 (en) 2008-07-22 2016-03-22 Eaton Corporation System to diagnose variable valve actuation malfunctions by monitoring fluid pressure in a control gallery
US9228454B2 (en) 2010-03-19 2016-01-05 Eaton Coporation Systems, methods and devices for rocker arm position sensing
US9284859B2 (en) 2010-03-19 2016-03-15 Eaton Corporation Systems, methods, and devices for valve stem position sensing
US8985074B2 (en) 2010-03-19 2015-03-24 Eaton Corporation Sensing and control of a variable valve actuation system
US9874122B2 (en) 2010-03-19 2018-01-23 Eaton Corporation Rocker assembly having improved durability
US9708942B2 (en) 2010-03-19 2017-07-18 Eaton Corporation Rocker arm assembly and components therefor
DE102011087557A1 (en) 2011-12-01 2013-06-06 Schaeffler Technologies AG & Co. KG follower
DE102012211525A1 (en) * 2012-07-03 2014-01-09 Schaeffler Technologies AG & Co. KG Cam follower for the valve train of an internal combustion engine
DE102012215654A1 (en) * 2012-09-04 2014-03-06 Schaeffler Technologies AG & Co. KG Lever-like cam follower i.e. rocker arm, for operating charge-cycle valve of internal combustion engine, has base body comprising base that has contact surface for spindle end of valve, where height of side walls is shortened
USD750670S1 (en) * 2013-02-22 2016-03-01 Eaton Corporation Rocker arm
WO2015134466A1 (en) 2014-03-03 2015-09-11 Eaton Corporation Valve actuating device and method of making same
US8991351B2 (en) 2013-03-15 2015-03-31 Roller Bearing Company Of America, Inc. Needle roller cam follower for higher mileage applications of light, medium and heavy duty vehicles
DE102014202349A1 (en) 2014-02-10 2015-08-13 Schaeffler Technologies AG & Co. KG Lever-like cam follower
DE102015202042A1 (en) * 2015-02-05 2016-03-03 Schaeffler Technologies AG & Co. KG cam follower
CN106014524B (en) * 2016-06-06 2018-08-07 陕西科技大学 Cage construction controls engine variable-valve
WO2019045740A1 (en) * 2017-08-31 2019-03-07 Koyo Bearings North America Llc Finger follower assembly
DE102017128931B3 (en) 2017-12-04 2019-05-29 Schaeffler Technologies AG & Co. KG Rocker arm for a valve train of an internal combustion engine and method for chipless production of a lever body made of sheet steel

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Also Published As

Publication number Publication date
US8656878B2 (en) 2014-02-25
KR20120118017A (en) 2012-10-25
EP2529088A1 (en) 2012-12-05
CN102725484B (en) 2015-06-24
DE102010005606A1 (en) 2011-07-28
US20120291736A1 (en) 2012-11-22
JP5808343B2 (en) 2015-11-10
WO2011088924A1 (en) 2011-07-28
MX2012007777A (en) 2012-08-01
CN102725484A (en) 2012-10-10
JP2013518207A (en) 2013-05-20
KR101701550B1 (en) 2017-02-01

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