US20110265750A1 - Switchable lever for a valve drive of an internal combustion engine - Google Patents

Switchable lever for a valve drive of an internal combustion engine Download PDF

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Publication number
US20110265750A1
US20110265750A1 US13/099,638 US201113099638A US2011265750A1 US 20110265750 A1 US20110265750 A1 US 20110265750A1 US 201113099638 A US201113099638 A US 201113099638A US 2011265750 A1 US2011265750 A1 US 2011265750A1
Authority
US
United States
Prior art keywords
rollers
lever
lever according
axle
cam
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.)
Abandoned
Application number
US13/099,638
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English (en)
Inventor
Matthias Becker
Robert Heinemann
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
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Assigned to SCHAEFFLER TECHNOLOGIES GMBH & CO. KG reassignment SCHAEFFLER TECHNOLOGIES GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BECKER, MATTHIAS, HEINEMANN, ROBERT
Publication of US20110265750A1 publication Critical patent/US20110265750A1/en
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Abandoned 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
    • 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
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L13/0005—Deactivating valves
    • 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
    • F01L13/0036—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 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
    • 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

Definitions

  • the invention relates to a switchable lever for a valve drive of an internal combustion engine.
  • the lever revealed in subsequently published DE 102010011828.1 is considered to be the closest prior art. It is noticeable that the axle has to be acted upon in a complicated manner via external means in order to be displaced. In association therewith, the abovementioned lever requires a relatively large amount of construction space laterally, and, at least in the switching state shown in FIG. 5 , an asymmetrical introduction of force occurs during the cam lift. It is also ascertained that the central region of the lever has a relatively large bulge because of the displaceable cam rollers positioned next to one another on the axle.
  • the invention is directed to a switchable lever for a valve drive of an internal combustion engine, which has two side walls with ends that are connected by a crossbar.
  • a gas-exchange valve system is present in the crossbar at one end and a bearing for the pivotable support of the crossbar is present at the other end.
  • An axle is held in the side walls between the ends with two cam rollers running on the axle.
  • the cam rollers are displaceable relative to each other into a first position via a first servo means and are displaceable away relative from each other into a second position via a second servo means.
  • One of the positions serves for a high-lift cam contact [switching to a large valve lift] and the other of the positions serves for a low-lift or zero-lift cam contact [switching to a low or 0 valve lift].
  • the object is achieved in that the axle is held axially nondisplaceably in the side walls.
  • the cam rollers can be displaced toward each other into a first position via a first servo means such that the cam rollers abut each other on a longitudinal center plane of the lever and the cam rollers can be displaced in the same manner away from each other into a second position via a second servo means.
  • a lever is therefore present without the disadvantages referred to at the beginning.
  • a particularly outstanding feature of the invention is the ultimately telescopic nesting of the cam rollers together with the support rollers, thus making it possible to save on construction space laterally.
  • forces are introduced into the lever symmetrically during the cam lift such that the lever has only an insignificant tilting tendency, if any at all.
  • the cam rollers can be physically broad such that the loading on the components by the surface pressure is minimized.
  • simple internal actuating means are proposed for the cam rollers for the displacement thereof (hydraulic medium/compression spring), and separate pressure spaces for the hydraulic medium can be omitted owing to said pressure spaces being formed axially between the support and cam rollers. It is obvious that this simultaneously provides excellent lubrication of the sealing rotary tapping between the inner annular casing of the particular cam roller and an outer casing of the support roller.
  • Hydraulic actuation of the cam rollers on both sides is optionally also possible.
  • Alternative actuating means for displacing the cam rollers counter to the pressure of hydraulic medium, such as magnetic or electromagnetic means etc., are also conceivable.
  • the support rollers proposed in a development of the invention are expediently directly adjacent to the side walls of the lever.
  • Said support rollers may be, but do not have to be, rotatable in relation to the axle.
  • the cam rollers are supported in both the positions thereof on the support rollers such that, during a cam lift, force is simultaneously introduced via the cam and support rollers.
  • Hydraulic medium from the circuit of the internal combustion engine is preferred as the servo means for producing the first position.
  • brake fluid or a separate hydraulic medium circuit may also be used.
  • At least one co-rotating helical compression spring clamped between the cam rollers is proposed as the spring means for producing the second position.
  • Said helical compression spring expediently sits in annular pockets of the inner faces of the cam rollers. It is advantageous here to place said annular pockets radially higher than the support rollers, thus providing sufficient construction depth for the latter.
  • a further embodiment relates to measures for supplying the hydraulic medium to the pressure space. It has proven particularly expedient to introduce the hydraulic medium for the lever from the bearing, which bearing can be designed as a dome for a head of a supporting element. Hydraulic medium is conducted in a simple manner via, for example, drilled transverse and longitudinal channels and a rotary tapping on the axle into the axle and from there to the pressure spaces. If the lever is not to be produced from steel sheet by punching and bending, but rather, for example, is to be cast, the channels may also be cast therein at the same time. It is also conceivable for the transverse and longitudinal channels to be formed separately and retrospectively arranged on the outer casing of the lever.
  • a center stop for the cam rollers runs on the axle.
  • Said center stop can be designed as a simple snap ring or the like sitting in an annular groove.
  • an annular collar on the axle is also possible.
  • a sliding mounting for the cam rollers on the axle is preferred, with a needle-type mounting also being possible. Should support rollers be used, the same applies thereto.
  • roller sliding system may also be used on a tilting lever or roller tappet.
  • the lever can be supported as it passes through the cam base circle such that the respective cam base circles are free from contact with the cam rollers, which minimizes the effort expended on displacing the latter.
  • Possible mating support surfaces include, for example, support cams on the earn shaft or elements which protrude from the cylinder head and project beyond the side walls.
  • FIG. 1 shows a spatial view of a lever according to the invention
  • FIG. 2 shows a top view according to FIG. 1 ;
  • FIG. 3 shows a cross section through the lever in the region of the axle with the cam rollers in a first position (low cam lift);
  • FIG. 4 shows the cross section as previously, but with the cam rollers in the second position (large cam lift).
  • a switchable lever 1 in the form of a rocker arm lever for a valve drive of an internal combustion engine is illustrated.
  • Said lever has a box-shaped geometry in top view and consists of two upright side walls 2 , the ends 3 , 4 of which are connected on their lower side by a cross bar 5 .
  • the side walls 2 have an expanded center section 30 which is adjoined by intermediate sections 31 which face each other and peter out in rectilinear end sections 32 .
  • FIG. 3 shows a first position of the cam rollers 9 , in which said cam rollers run up to each other on a longitudinal center plane of the lever 1 .
  • a snap ring on the axle 8 is shown in the form of a stop element 29 . This position serves for a low-lift cam contact [switching to a low valve lift].
  • FIG. 4 shows a second position of the cam rollers 9 , in which said cam rollers are displaced away from each other. This position serves for a high-lift can contact [switching to a high valve lift].
  • a pair of diametrically opposite support rollers 12 of smaller outside diameter than the cam rollers 9 is added, fixed axially, to the axle 8 , adjacent to the side walls 2 (see FIGS. 3 , 4 ).
  • the outer faces 13 of the cam rollers 9 each have a cylindrical pocket 14 , via the inner annular casing 15 of which said cam rollers are mounted “in a sucking manner” on an outer casing 16 of the particular support roller 12 in both positions.
  • a pressure space 19 for hydraulic medium which can be introduced via the axle 8 , is produced axially between a base 17 of the respective pocket 14 and an inner face 18 of the adjacent slideably mounted support roller 16 as a first servo means 10 (sec FIG. 3 ).
  • a mechanical spring means present in the form of a helical compression spring is clamped between the inner faces 20 of the cam rollers 9 as a second servo means 11 .
  • opposite annular pockets 21 run on the inner faces 20 of the cam rollers 9 , the spring means 11 sitting in said annular pockets and the end sides of said spring means being supported on the bottoms 22 of the said pockets.
  • the annular pockets 21 run in a radial region above the support rollers 12 , and therefore there is sufficient construction space.
  • the cam rollers 9 In order to produce the first position, the cam rollers 9 can be displaced towards each other, counter to the force of the spring means 11 , by high pressure at the hydraulic medium 10 , which can be conducted into the pressure space 19 . In order to produce the second position, the cam rollers 9 , with the high pressure at the hydraulic medium 10 switched off, can be displaced away from each other by the force of the spring means 11 .
  • the hydraulic medium 10 is introduced via a supply line 23 in the lever 1 .
  • the supply line 23 starts from the bearing 7 at the other end 4 and is fed via a head of a supporting element, on which the lever 1 lies together with the bearing 7 thereof when installed.
  • the supply line 23 consists of a transverse channel 24 in the crossbar 5 , which channel opens at an outer end into a longitudinal channel 25 of the respective side wall 2 , which longitudinal channel 25 communicates with an annular-groove/bore overflow 26 in the axle 8 .
  • the supply line 23 is conducted further from said overflow to an axial channel 27 in the axle 8 .
  • One radial passage 28 branches off from the axial channel 27 per pressure space 19 , the radial passage being positioned axially close to the inner face 18 of the corresponding support roller 12 .
  • upper sides 33 of the side walls 2 have support surfaces 34 .
  • the lever 1 can be supported, as it passes through the cam base circle, on support cams of the cam shaft, which is located thereabove upon installation, in such a manner that the cam rollers 9 of said lever, as they pass through the cam base circle, run with play with respect to the base circle of the counter running cams and can therefore be displaced relatively easily.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
US13/099,638 2010-05-03 2011-05-03 Switchable lever for a valve drive of an internal combustion engine Abandoned US20110265750A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010019065.9 2010-05-03
DE102010019065A DE102010019065A1 (de) 2010-05-03 2010-05-03 Schaltbarer Hebel für einen Ventiltrieb einer Brennkraftmaschine

Publications (1)

Publication Number Publication Date
US20110265750A1 true US20110265750A1 (en) 2011-11-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US13/099,638 Abandoned US20110265750A1 (en) 2010-05-03 2011-05-03 Switchable lever for a valve drive of an internal combustion engine

Country Status (2)

Country Link
US (1) US20110265750A1 (de)
DE (1) DE102010019065A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110265751A1 (en) * 2010-05-03 2011-11-03 Schaeffler Technologies Gmbh & Co. Kg Switchable lever for a valve drive of an internal combustion engine
USD791190S1 (en) 2015-07-13 2017-07-04 Eaton Corporation Rocker arm assembly
USD833482S1 (en) 2015-07-13 2018-11-13 Eaton Corporation Rocker arm
CN111102028A (zh) * 2019-12-20 2020-05-05 潍柴动力股份有限公司 一种摇臂组件、气门配气结构及发动机
US10648377B2 (en) 2015-08-19 2020-05-12 Volvo Truck Corporation Variable valve actuation mechanism, an internal combustion engine, and a vehicle
CN111622821A (zh) * 2020-01-23 2020-09-04 姬腾飞 一种可自行开闭滚轮轴润滑油孔的发动机摇臂

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017218372A1 (de) * 2017-10-13 2019-04-18 Mahle International Gmbh Nockenfolger eines Ventiltriebs

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3958828A (en) * 1973-02-14 1976-05-25 Fuji Kiko Kabushiki Kaisha Reclining seat device for motor car
US6439179B2 (en) * 2000-01-14 2002-08-27 Delphi Technologies, Inc. Deactivation and two-step roller finger follower having a bracket and lost motion spring
US6532920B1 (en) * 2002-02-08 2003-03-18 Ford Global Technologies, Inc. Multipositional lift rocker arm assembly
US6769387B2 (en) * 2002-10-19 2004-08-03 General Motors Corporation Compact two-step rocker arm assembly
US6976461B2 (en) * 2002-12-11 2005-12-20 Ina-Schaeffler Kg Finger lever of a valve train of an internal combustion engine
US7146948B1 (en) * 2005-09-30 2006-12-12 Clinton D Eells Valve lifting arrangement
US7201125B2 (en) * 2005-08-22 2007-04-10 Schaeffler Kg Valve train for an internal combustion engine
US20080127917A1 (en) * 2006-12-01 2008-06-05 William Riley Mode-Switching Cam Follower
US20090095241A1 (en) * 2007-10-12 2009-04-16 Schaeffler Kg Cam follower for the variable actuation of a gas-exchange valve of an internal combustion engine
US7849828B2 (en) * 2008-03-05 2010-12-14 Gm Global Technology Operations, Inc. Rocker arm assembly
US7934477B2 (en) * 2008-08-25 2011-05-03 GM Global Technology Operations LLC Rocker arm assembly
US8550047B2 (en) * 2009-06-09 2013-10-08 Honda Motor Co., Ltd. Valve control apparatus for internal combustion engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010011828A1 (de) 2010-03-18 2011-09-22 Schaeffler Technologies Gmbh & Co. Kg Schaltbarer Hebel für einen Ventiltrieb einer Brennkraftmaschine

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3958828A (en) * 1973-02-14 1976-05-25 Fuji Kiko Kabushiki Kaisha Reclining seat device for motor car
US6439179B2 (en) * 2000-01-14 2002-08-27 Delphi Technologies, Inc. Deactivation and two-step roller finger follower having a bracket and lost motion spring
US6532920B1 (en) * 2002-02-08 2003-03-18 Ford Global Technologies, Inc. Multipositional lift rocker arm assembly
US6769387B2 (en) * 2002-10-19 2004-08-03 General Motors Corporation Compact two-step rocker arm assembly
US6976461B2 (en) * 2002-12-11 2005-12-20 Ina-Schaeffler Kg Finger lever of a valve train of an internal combustion engine
US7201125B2 (en) * 2005-08-22 2007-04-10 Schaeffler Kg Valve train for an internal combustion engine
US7146948B1 (en) * 2005-09-30 2006-12-12 Clinton D Eells Valve lifting arrangement
US20080127917A1 (en) * 2006-12-01 2008-06-05 William Riley Mode-Switching Cam Follower
US20090095241A1 (en) * 2007-10-12 2009-04-16 Schaeffler Kg Cam follower for the variable actuation of a gas-exchange valve of an internal combustion engine
US7849828B2 (en) * 2008-03-05 2010-12-14 Gm Global Technology Operations, Inc. Rocker arm assembly
US7934477B2 (en) * 2008-08-25 2011-05-03 GM Global Technology Operations LLC Rocker arm assembly
US8550047B2 (en) * 2009-06-09 2013-10-08 Honda Motor Co., Ltd. Valve control apparatus for internal combustion engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110265751A1 (en) * 2010-05-03 2011-11-03 Schaeffler Technologies Gmbh & Co. Kg Switchable lever for a valve drive of an internal combustion engine
US8677958B2 (en) * 2010-05-03 2014-03-25 Schaeffler Technologies AG & Co. KG Switchable lever for a valve drive of an internal combustion engine
USD791190S1 (en) 2015-07-13 2017-07-04 Eaton Corporation Rocker arm assembly
USD833482S1 (en) 2015-07-13 2018-11-13 Eaton Corporation Rocker arm
US10648377B2 (en) 2015-08-19 2020-05-12 Volvo Truck Corporation Variable valve actuation mechanism, an internal combustion engine, and a vehicle
CN111102028A (zh) * 2019-12-20 2020-05-05 潍柴动力股份有限公司 一种摇臂组件、气门配气结构及发动机
CN111622821A (zh) * 2020-01-23 2020-09-04 姬腾飞 一种可自行开闭滚轮轴润滑油孔的发动机摇臂

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DE102010019065A1 (de) 2011-11-03

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AS Assignment

Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BECKER, MATTHIAS;HEINEMANN, ROBERT;SIGNING DATES FROM 20110415 TO 20110418;REEL/FRAME:026216/0373

AS Assignment

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, GERMANY

Free format text: CHANGE OF NAME;ASSIGNOR:SCHAEFFLER TECHNOLOGIES GMBH & CO. KG;REEL/FRAME:028533/0036

Effective date: 20120119

STCB Information on status: application discontinuation

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