EP1518042A1 - Camshaft, especially for an internal combustion engine of a motor vehicle, comprising shiftable cams - Google Patents
Camshaft, especially for an internal combustion engine of a motor vehicle, comprising shiftable camsInfo
- Publication number
- EP1518042A1 EP1518042A1 EP04738567A EP04738567A EP1518042A1 EP 1518042 A1 EP1518042 A1 EP 1518042A1 EP 04738567 A EP04738567 A EP 04738567A EP 04738567 A EP04738567 A EP 04738567A EP 1518042 A1 EP1518042 A1 EP 1518042A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- camshaft
- cam segment
- segment
- segments
- 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
Links
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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/08—Shape of 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
- 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
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49293—Camshaft making
Definitions
- Camshaft in particular a motor vehicle internal combustion engine, with switchable cams
- the invention relates to a camshaft, in particular a motor vehicle internal combustion engine with adjustable cam segments of at least one cam according to the preamble of patent claim 1.
- Such a camshaft is the subject of WO 2004 / 001199A2, which has not been prepublished with regard to the priority of the application.
- WO 2004 / 001199A2 For larger radial adjustment paths of the cam segments against each other and the second movable cam segment opposite the first cam fixed to the camshaft segment, there is required for reasons of strength, a relatively large camshaft base body area between the legs of the second cam segment • for its guide. This limits the radial adjustment path in a compact camshaft design.
- the invention is primarily concerned with the problem of creating an improvement here. This problem is solved in a generic camshaft by an embodiment according to the characterizing features of patent claim 1.
- the invention is based on the general idea of allowing the second, horseshoe-shaped cam segment to run out radially freely on the free U-legs. This makes it possible to radially guide the second cam segment on the camshaft main body, which lies between the U-legs, and / or in a tongue and groove guide between the first and second cam segments. A maximum displacement path of the first cam segment directed radially inwards and outwards can be ensured by end stops.
- Part A of FIG. 1 shows, in an axial section, a camshaft with a camshaft main body 1 and a cam with cam segments that can be adjusted relative to one another, namely a first cam segment 2 that is immovable with respect to the camshaft main body 1 and a switchable, radially displaceable second cam segment 3.
- the two cam segments 2 and 3 can be out of phase with one another by an amount of rotation X (part B of FIG. 1).
- An oil supply channel 7 is provided within the base body 1 of the camshaft.
- the second cam segment 3 can assume a position (parts C and E of FIG. 1) which is radially extended relative to the main body 1 of the camshaft or a position which is retracted in the opposite direction (part D of FIG. 1). In both of the aforementioned positions, which are each switchable, the second cam segment 3 can be locked.
- locking elements 5 and 6 are provided, which are each mounted in the base body 1 of the camshaft and can engage in abutments on the second cam segment 3.
- the wi- in the simplest case, the bearings are bores in the second cam segment 3.
- the locking means 5, 6 can be switched by pressure changes in the oil supply in the oil supply channel 7.
- the locking elements 5 and 6 are each spring-loaded pistons. For easy-to-reach, good guidance of the pistons 6, these can interact with guide rings 6 '.
- the sections B and C of FIG. 1 run axially centrally through the base body 1 of the camshaft between two spaced-apart adjacent first cam segments 2.
- lateral, radially extending grooves 9 within the base body of the camshaft 1 can be seen in this section E.
- Pin-shaped stops 8 inserted into the second cam segment create an extension limit for the second cam segment compared to the first cam segment.
- FIG. 2 shows partial views A through E of a variant of the camshaft of Figure 1 •.
- a view of a cam shows how a radially displaceable
- the second cam segment 3 can be switched between two adjacent first cam segments 2.
- the common cam profile of the first cam segments is active.
- the second cam segment 3 is in the extended position, only the base circle of the first cam segments 2 is active, while the “pointed” region of the cam is formed by the extended second cam segment 3.
- the locking elements 5, 6 in FIG. 2 correspond to those in FIG. 1 and are only shown larger in sections here. In this enlarged view, the springs 10, 11 of this locking element 5, 6 are also clearly visible.
- FIG. 3 shows an embodiment shown in partial areas A to C, in which the same locking elements as in the previously described embodiments are used in principle, but positioned differently.
- a spring 4 is provided in order to to shift the second cam segment 3 into its extended position in an unlocked state.
- Fig. 4 shows a further alternative embodiment of the No- 'ckenwelle of FIG. 1.
- This enlarged guidance consists in that, for example, a type of tongue and groove guidance N / F is provided between the respective first cam segment 2 and the second cam segment 3 slidably mounted between them.
- the abutments for a stop of the second cam segment 3 against the end stops of a groove 9 provided in the camshaft main body 1 are formed here by parts of the locking elements 5 and 6.
- One of these stop elements is given the reference number 8.
- a bearing sleeve 16 inserted into the camshaft base body 1 also serves as a stop for the second cam segment 3 with respect to the groove 9.
- the locking bolt 5 is designed as a taper bolt 12 in its front region. guided. This simplifies the locking of the locking.
- 13 denotes a reset element for locking the second cam segment 3 in its extended position.
- Fig. 6 shows various sections of a large representation of the locking elements associated with a second cam. Basically, these locking elements 5 and 6 are constructed as in the exemplary embodiments described above.
- a guide sleeve 19 has not yet been mentioned in sub-area A of FIG. 6. The same applies with regard to a vent opening 17 in locking element 5.
- a and C in FIG. 6 each show how the relevant locking elements 5, 6 engage ,
- the locking individual part 5 is mounted together with its components assigned to the second cam segment 3 in a cup-shaped sleeve 20.
- FIG. 7 shows an exploded view of the locking device according to, for example, in particular FIG. 6.
- Fig. 9 shows embodiments for camshaft main body with first cam segments, namely A: a built-up camshaft with an inner tube element produced, for example, by IHU (inner high-pressure forming process) and joined first cam segments 2,
- E a sectional view of a camshaft, which can be a blank, for example, by casting or is produced from the full by forging or machining.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10325042 | 2003-06-02 | ||
DE10325042 | 2003-06-02 | ||
PCT/DE2004/001098 WO2004109068A1 (en) | 2003-06-02 | 2004-05-26 | Camshaft, especially for an internal combustion engine of a motor vehicle, comprising shiftable cams |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1518042A1 true EP1518042A1 (en) | 2005-03-30 |
EP1518042B1 EP1518042B1 (en) | 2008-11-26 |
Family
ID=33494804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04738567A Expired - Fee Related EP1518042B1 (en) | 2003-06-02 | 2004-05-26 | Camshaft, especially for an internal combustion engine of a motor vehicle, comprising shiftable cams |
Country Status (6)
Country | Link |
---|---|
US (1) | US7069889B2 (en) |
EP (1) | EP1518042B1 (en) |
JP (1) | JP4843484B2 (en) |
CN (1) | CN100476165C (en) |
DE (2) | DE112004000030D2 (en) |
WO (1) | WO2004109068A1 (en) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006004750A1 (en) | 2005-04-11 | 2006-10-12 | Schaeffler Kg | Valve drive component (sic) for transfer of stroke by cam projections on gas change valve, internal combustion engines has protection layer of at least one metal-free amorphous hydrocarbon layer with sp2 and sp3 carbon |
GB2434404B (en) * | 2006-01-18 | 2010-11-03 | Powertrain Technology Ltd | Improvements to variable valve actuation using slideable, latching cam lobes |
DE102006012358A1 (en) * | 2006-03-17 | 2007-09-27 | Mahle International Gmbh | Driving part e.g. cam, press-fit connection producing method, involves mounting driving part in press-fit connection, where part is heated up to reaching joining temperature and thus expanded, and part is moved on shaft in force-free manner |
GB0613727D0 (en) * | 2006-07-11 | 2006-08-23 | Powertrain Technology Ltd | Improvements to 2-step variable timing mechanisms |
KR101305829B1 (en) | 2007-11-20 | 2013-09-06 | 현대자동차주식회사 | Variable cam device |
DE102008060167B4 (en) * | 2008-11-27 | 2021-05-27 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Valve train of an internal combustion engine |
KR101209733B1 (en) * | 2010-09-01 | 2012-12-07 | 현대자동차주식회사 | Variable valve lift appratus |
US9745875B2 (en) * | 2012-08-22 | 2017-08-29 | Toyota Jidosha Kabushiki Kaisha | Variable valve gear for internal combustion engine |
JP2014092128A (en) * | 2012-11-06 | 2014-05-19 | Toyota Motor Corp | Variable valve gear of internal combustion engine |
JP5920177B2 (en) * | 2012-11-14 | 2016-05-18 | トヨタ自動車株式会社 | Variable valve operating device for internal combustion engine |
JP2014152694A (en) * | 2013-02-07 | 2014-08-25 | Toyota Motor Corp | Variable valve gear for internal combustion engine |
JP5924305B2 (en) * | 2013-05-13 | 2016-05-25 | トヨタ自動車株式会社 | Variable valve operating device for internal combustion engine |
JP5962603B2 (en) * | 2013-07-04 | 2016-08-03 | トヨタ自動車株式会社 | Variable valve operating device for internal combustion engine |
JP5991289B2 (en) * | 2013-09-05 | 2016-09-14 | トヨタ自動車株式会社 | Variable valve operating apparatus for internal combustion engine and variable valve operating system for internal combustion engine |
JP6107976B2 (en) | 2014-01-22 | 2017-04-05 | トヨタ自動車株式会社 | Variable valve operating device for internal combustion engine |
US9581294B2 (en) | 2014-02-07 | 2017-02-28 | Curtis Roys | Replaceable sleeves used in distribution blocks |
DE102014111354A1 (en) * | 2014-08-08 | 2016-02-25 | Karl Storz Gmbh & Co. Kg | Sterile sleeve for a medical observation instrument and method for operating a medical observation instrument |
DE102015101337A1 (en) * | 2015-01-29 | 2016-08-04 | Thyssenkrupp Presta Teccenter Ag | Camshaft for valve actuation with variable valve lift |
CN105863738A (en) * | 2015-04-30 | 2016-08-17 | 熵零股份有限公司 | Radial compensating mechanism and device applying same |
CN105909313A (en) * | 2015-04-30 | 2016-08-31 | 熵零股份有限公司 | Sliding type radial compensation mechanism and device applying same |
CN108026792B (en) * | 2015-09-30 | 2020-03-27 | 本田技研工业株式会社 | Cam shaft |
CN112282882A (en) * | 2020-11-30 | 2021-01-29 | 一汽解放汽车有限公司 | Camshaft assembly for controlling engine cylinder valve and vehicle |
FR3117540B1 (en) * | 2020-12-14 | 2022-12-16 | Renault | Camshaft of an internal combustion engine. |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01178710A (en) | 1988-01-06 | 1989-07-14 | Mazda Motor Corp | Valve driving device for engine |
US5404770A (en) * | 1991-08-14 | 1995-04-11 | Volkswagen Ag | Variable cam arrangement for a lift valve |
DE4222477A1 (en) | 1991-08-14 | 1993-02-18 | Volkswagen Ag | Cam mechanism for IC engine valve - has radially adjustable cam component to adjust amount of valve lift obtained |
IT1256558B (en) | 1992-12-18 | 1995-12-07 | Francesco Giulio Di | CAM DEVICE, TO VARY THE VALVE TIMING OF MOTORS, USING INCOMPRESSABLE FLUID AS A STRUCTURAL ELEMENT TO REALIZE THE DEFORMATION AND / OR THE MOVEMENT OF THE CAM PROFILE |
JPH074217A (en) * | 1993-04-14 | 1995-01-10 | Toyota Autom Loom Works Ltd | Camshaft with variable valve lift mechanism |
DE69421170T2 (en) | 1993-12-17 | 2000-07-06 | Christos Valasopoulos | CAM TIP WITH Eccentric Rotation |
JPH09256827A (en) * | 1995-11-07 | 1997-09-30 | Yamaha Motor Co Ltd | Valve gear for engine |
DE19802484C2 (en) * | 1998-01-23 | 2000-06-08 | Daimler Chrysler Ag | Method and device for producing assembled camshafts |
DE10030904A1 (en) | 2000-06-23 | 2002-01-31 | Audi Ag | Variable geometry camshaft for IC engine has radially adjustable cam segment to vary valve stroke |
GB2385888B (en) | 2002-06-21 | 2004-05-05 | Jean-Pierre Pirault | Improvements to latchable cam lobe systems for poppet valve motion control |
-
2004
- 2004-05-26 CN CNB2004800069957A patent/CN100476165C/en not_active Expired - Fee Related
- 2004-05-26 DE DE112004000030T patent/DE112004000030D2/en not_active Expired - Fee Related
- 2004-05-26 WO PCT/DE2004/001098 patent/WO2004109068A1/en active Application Filing
- 2004-05-26 DE DE502004008517T patent/DE502004008517D1/en not_active Expired - Lifetime
- 2004-05-26 EP EP04738567A patent/EP1518042B1/en not_active Expired - Fee Related
- 2004-05-26 JP JP2006508113A patent/JP4843484B2/en not_active Expired - Fee Related
- 2004-05-26 US US10/536,277 patent/US7069889B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2004109068A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1518042B1 (en) | 2008-11-26 |
US20060011161A1 (en) | 2006-01-19 |
JP2006526727A (en) | 2006-11-24 |
WO2004109068A1 (en) | 2004-12-16 |
CN100476165C (en) | 2009-04-08 |
JP4843484B2 (en) | 2011-12-21 |
DE112004000030D2 (en) | 2005-05-12 |
CN1774563A (en) | 2006-05-17 |
DE502004008517D1 (en) | 2009-01-08 |
US7069889B2 (en) | 2006-07-04 |
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