US20160281553A1 - Sliding cam system having an extended engagement region - Google Patents

Sliding cam system having an extended engagement region Download PDF

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Publication number
US20160281553A1
US20160281553A1 US15/035,594 US201415035594A US2016281553A1 US 20160281553 A1 US20160281553 A1 US 20160281553A1 US 201415035594 A US201415035594 A US 201415035594A US 2016281553 A1 US2016281553 A1 US 2016281553A1
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US
United States
Prior art keywords
shifting
sliding cam
region
groove
extended
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
US15/035,594
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English (en)
Inventor
Harald Elendt
Jan Pfannenmuller
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 AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ELENDT, HARALD, PFANNENMULLER, JAN
Publication of US20160281553A1 publication Critical patent/US20160281553A1/en
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
    • 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
    • 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
    • F01L1/047—Camshafts
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
    • 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
    • F01L2013/0052—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 with cams provided on an axially slidable sleeve

Definitions

  • the invention relates to a sliding cam system, having at least one sliding cam, which is arranged in a manner which prevents relative rotation but allows axial shifting on at least one axially fixed base shaft of a reciprocating-piston internal combustion engine in order to form a camshaft, having at least one actuating device for adjusting the sliding cam into different axial positions by at least one actuating pin that can be made to engage in at least one shifting groove on the periphery of the sliding cam, wherein the actuating device has a housing fixed to the engine and the shifting groove is machined into a top circle surface of the sliding cam down to a groove bottom and is of helical design and has an entry region, a shifting region having an accelerating flank and a braking flank, and an exit region for the actuating pin.
  • a sliding cam system of this kind corresponding to the preamble, is known from DE 10 2009 009 080 A1.
  • Two shifting grooves are arranged in series on the top circle surface of the sliding cams of this system, said grooves having cam tracks extending axially in opposite directions on the periphery of the top circle surface and being designed as double S grooves.
  • the exit speed of the respective actuating pin from the housing can be too low to engage correctly in the respective shifting groove. This can lead to incorrect switching, incorrect positioning and partial overlaps.
  • the intention is to ensure that incorrect switching, incorrect positioning and partial overlaps do not occur and that reliable and precise shifting of the sliding cam takes place under all operating conditions.
  • this object is achieved by virtue of the fact that the shifting groove is assigned an extended engagement region and that the extended engagement region at least partially has a material removal from the level of the top circle or top circle surface in the direction of the groove bottom.
  • the extension of the engagement region essentially follows the entry region, counter to the direction of rotation of the sliding cam. This ensures that the actuating pin can already exit completely from the actuating device in this region without being hindered by top circle regions. High exit speeds of the actuating pin are therefore not required, with the result that slow, simple and low-cost actuating devices can be used.
  • Each shifting groove is advantageously assigned an extended engagement region, allowing the proposed measures also to be used for both grooves of a double S groove.
  • the material removal is embodied in such a way that it extends as far as the level of the groove bottom and has the same peripheral extent as the extended engagement region.
  • the extended shifting region and the material removal for the first shifting groove is between about 145° and about 290° of cam angle and the extended engagement region for the second shifting groove amounts to about 75° to about 290° of cam angle.
  • the extended engagement region having a material removal can correspond to the complete sliding cam periphery minus the shifting region, thus ensuring that long peripheral distances are available for the entry of the actuating pins.
  • the braking flank is partially cut away, depending on the embodiment of the extended engagement region, it is provided that the braking flank of the shifting region is offset outward into the wall of the shifting groove.
  • the retaining device Since a retaining device, which has a spring-loaded retaining element that is in operative connection with a respective retaining recess assigned to each of the axial positions, is generally effective on the sliding cam, the retaining device can also be used to contribute to the braking of the sliding cam in the respective shifted position.
  • FIG. 1 shows a dual diagram showing a development of the periphery over 900° of cam angle, wherein the shifting of the sliding cam is plotted in the upper half and the groove bottom depth is plotted in the lower part;
  • FIGS. 2, 3 and 4 each show a view of a top circle region and sections through the latter for a first groove arrangement
  • FIGS. 5, 6 and 7 each show a view of a top circle region and sections through the latter for a modified groove arrangement
  • FIGS. 8 and 9 show views of top circle regions of sliding cams for modified groove arrangements.
  • 1 denotes the shifting path of a sliding cam in one direction and 2 denotes the shifting path of the sliding cam in the opposite direction.
  • 3 a denotes the entry distance of an actuating pin, which leads at the end to the shifting of the sliding cam along the shifting path 1 .
  • the entry distance 3 a of the actuating pin relates to the first shifting groove.
  • a corresponding entry distance for a second shifting groove, denoted by 3 b, begins at about 270° of cam angle and ends at about 560° of cam angle.
  • FIG. 2 which shows a top circle region
  • the top circle surface is denoted by 4 .
  • a shifting groove which is denoted by 5 .
  • Section E-E in FIG. 4 passes through the shifting groove 5 and shows that a large extended engagement region, denoted by 9 , is provided, into which a material removal is machined as far as a groove bottom 7 .
  • the extended engagement region 9 comprises a cam angle of somewhat more than 145°.
  • Section D-D shown in FIG. 3 which passes through the shifting groove 6 and the top circle surface 4 , shows an extended engagement region 10 , which amounts to about 75° of cam angle.
  • the material removal as far as a groove bottom 8 is embodied in a corresponding manner.
  • the view of the top circle surface 4 in FIG. 5 shows a modified embodiment of the double S groove, wherein the shifting groove denoted by 5 a and the shifting groove with the reference sign 6 a can be seen.
  • the extended engagement region 11 of shifting groove 5 a amounts to more than about 290° of cam angle and the extended engagement region 12 of shifting groove 6 a likewise to more than about 290° of cam angle.
  • Modified double S grooves are once again shown in FIGS. 8 and 9 together with the top circle surfaces 4 .
  • a braking flank offset 13 is provided and, in the case of shifting groove 6 a, a braking flank offset 14 is provided, these being machined into the wall of the shifting groove since the braking flanks that are normally present in the absence of the inventive features are removed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Gears, Cams (AREA)
US15/035,594 2013-11-15 2014-11-03 Sliding cam system having an extended engagement region Abandoned US20160281553A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102013223299.3 2013-11-15
DE102013223299.3A DE102013223299A1 (de) 2013-11-15 2013-11-15 Schiebenockensystem mit verlängertem Einspurbereich
PCT/DE2014/200615 WO2015070862A1 (de) 2013-11-15 2014-11-03 Schiebenockensystem mit verlängertem einspurbereich

Publications (1)

Publication Number Publication Date
US20160281553A1 true US20160281553A1 (en) 2016-09-29

Family

ID=52133753

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/035,594 Abandoned US20160281553A1 (en) 2013-11-15 2014-11-03 Sliding cam system having an extended engagement region

Country Status (4)

Country Link
US (1) US20160281553A1 (de)
CN (1) CN105723057A (de)
DE (1) DE102013223299A1 (de)
WO (1) WO2015070862A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180320566A1 (en) * 2015-11-06 2018-11-08 Borgwarner Inc. Valve operating system providing variable valve lift and/or variable valve timing
US20220341351A1 (en) * 2019-09-18 2022-10-27 thyssenkrupp Dynamic Components TecCenter AG Shift gate, sliding cam system and camshaft
US12031461B2 (en) * 2019-09-18 2024-07-09 thyssenkrupp Dynamic Components TecCenter AG Shift gate, sliding cam system and camshaft

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015221116A1 (de) 2015-10-29 2017-05-04 Schaeffler Technologies AG & Co. KG Axialkulisse mit einer Abbremseinrichtung zum Abbremsen eines Schiebenockenstückes in einem Schiebenockensystem
CN108708791B (zh) * 2018-04-27 2020-05-05 姬腾飞 一种凸轮滑动式发动机制动装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070178731A1 (en) * 2004-02-21 2007-08-02 Schaeffler Kg Valve train with cam switching for the gas exchange valves of a four-cycle internal combustion engine
US20100251982A1 (en) * 2009-04-04 2010-10-07 Schaeffler Technologies Gmbh & Co. Kg Valve drive of an internal combustion engine
US20130228039A1 (en) * 2010-12-03 2013-09-05 Schaeffler Technologies AG & Co. KG Sliding cam system havnig slide grooves and locking means
US20130247711A1 (en) * 2012-03-22 2013-09-26 Schaeffler Technologies AG & Co. KG Cam part for a variable sliding cam valve drive

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502004008185D1 (de) * 2003-07-19 2008-11-20 Porsche Ag Ventiltrieb für eine Brennkraftmaschine
DE102004024219B4 (de) * 2004-05-15 2019-01-31 Audi Ag Ventiltrieb einer Brennkraftmaschine
DE102007037745A1 (de) * 2007-08-10 2009-02-12 Daimler Ag Brennkraftmaschinenventiltriebumschaltvorrichtung
DE102009006632B4 (de) * 2009-01-29 2015-12-31 Audi Ag Ventiltrieb einer Brennkraftmaschine sowie Verfahren zum Betreiben einer Brennkraftmaschine
DE102009009080A1 (de) 2009-02-14 2010-08-19 Schaeffler Technologies Gmbh & Co. Kg Ventiltrieb einer Brennkraftmaschine
DE102011080267A1 (de) * 2011-08-02 2013-02-07 Schaeffler Technologies AG & Co. KG Verschiebenutkontur von Schiebenockeneinheiten einer Hubkolbenbrennkraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070178731A1 (en) * 2004-02-21 2007-08-02 Schaeffler Kg Valve train with cam switching for the gas exchange valves of a four-cycle internal combustion engine
US20100251982A1 (en) * 2009-04-04 2010-10-07 Schaeffler Technologies Gmbh & Co. Kg Valve drive of an internal combustion engine
US20130228039A1 (en) * 2010-12-03 2013-09-05 Schaeffler Technologies AG & Co. KG Sliding cam system havnig slide grooves and locking means
US20130247711A1 (en) * 2012-03-22 2013-09-26 Schaeffler Technologies AG & Co. KG Cam part for a variable sliding cam valve drive

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180320566A1 (en) * 2015-11-06 2018-11-08 Borgwarner Inc. Valve operating system providing variable valve lift and/or variable valve timing
US10539051B2 (en) * 2015-11-06 2020-01-21 Borgwarner Inc. Valve operating system providing variable valve lift and/or variable valve timing
US20220341351A1 (en) * 2019-09-18 2022-10-27 thyssenkrupp Dynamic Components TecCenter AG Shift gate, sliding cam system and camshaft
US12031461B2 (en) * 2019-09-18 2024-07-09 thyssenkrupp Dynamic Components TecCenter AG Shift gate, sliding cam system and camshaft

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Publication number Publication date
CN105723057A (zh) 2016-06-29
WO2015070862A1 (de) 2015-05-21
DE102013223299A1 (de) 2015-05-21

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Date Code Title Description
AS Assignment

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

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ELENDT, HARALD;PFANNENMULLER, JAN;REEL/FRAME:038658/0253

Effective date: 20160224

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION