EP1963625A1 - Camshaft - Google Patents
CamshaftInfo
- Publication number
- EP1963625A1 EP1963625A1 EP06828664A EP06828664A EP1963625A1 EP 1963625 A1 EP1963625 A1 EP 1963625A1 EP 06828664 A EP06828664 A EP 06828664A EP 06828664 A EP06828664 A EP 06828664A EP 1963625 A1 EP1963625 A1 EP 1963625A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- outer shaft
- inner shaft
- camshaft
- annular groove
- 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
- 238000007789 sealing Methods 0.000 claims description 31
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
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
- F01L1/047—Camshafts
-
- 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
-
- 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
-
- 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
- the invention relates to a camshaft for in particular motor vehicle engines with about the camshaft axis over limited circumferential angle against each other rotatable cams according to the preamble of patent claim 1.
- camshafts are known as adjustable or phase-adjustable camshafts. They allow a change in the timing of the gas exchange valves of an internal combustion engine.
- camshafts are used with slidingly mounted shaft elements, wherein first cam elements are connected to an inner shaft member and second cam elements with an outer shaft member.
- the outer shaft member to the cam elements of the inner shaft member associated with wall openings through which the cam elements with the inner shaft member connecting pins pass.
- the cam elements of the one shaft member, the actuation of the intake valves and the cam elements of the other shaft member can control the actuation of the exhaust valves of the cylinder, whereby a valve overlap is variable, while the valve opening times are not influenced.
- Such a camshaft is known for example from DE 39 43 426 Cl.
- the invention is concerned with the problem of improving a camshaft of the type mentioned in that neither during assembly of the camshaft nor in a subsequent transport thereof, a displacement of the inner shaft with respect to the outer shaft may occur.
- the invention is based on the general idea, in a camshaft having an inner shaft and a coaxially arranged outer shaft to support the inner shaft via at least one arranged on an axial end portion of the shaft securing device directly against a stepless inner lateral surface of the outer shaft and thereby secure.
- the stepless inner circumferential surface is formed by the formation of the outer shaft as a circular cylindrical tube with a continuous same inner diameter.
- the at least one axial end of the inner shaft arranged securing device fixes the inner shaft radially in such a way in the outer shaft, that even under unfavorable transport conditions or during assembly of the two shafts, the coaxiality between the inner and outer shaft is maintained.
- securing means In the axial longitudinal direction spaced from the end of the inner shaft arranged securing means is provided between an outer circumferential surface of the inner shaft and an inner circumferential surface of the outer shaft, an annular space which is filled for lubrication of the inner shaft with respect to the outer shaft, for example, with oil.
- Two such axially arranged end side of the inner shaft securing devices allow easy insertion of mounting pins in the inner shaft, whereby the friction occurring between the mounting pins and the inner shaft does not lead to a radial displacement between the inner shaft and the outer shaft.
- a displacement between the inner shaft and the outer shaft is reliably prevented by the safety devices even at a later transport of the camshaft.
- the securing device has a fixedly connected to the inner shaft, annular securing element, which is arranged in the region of an axially on the inner shaft end side arranged and radially inwardly set back circumferential extent.
- the recessed radially inward circumferential step forms a seat for the fuse element, which is firmly connected, for example via a shrink fit with the stage.
- the fuse element can thus be connected in manufacturing technology simple manner with the inner shaft, at the same time a high manufacturing quality can be achieved or guaranteed.
- annular sealing element Expediently axially adjacent between the peripheral stage on the one hand and the securing element on the other hand an outwardly open annular groove is formed, in which an annular sealing element is arranged, which seals the annular space between the inner and the outer shaft.
- the annular sealing element is formed for example as an outer clamping ring and applies self-tensioning to the inner circumferential surface of the outer shaft. With its directed towards the axis of the inner shaft, radially inner region engages the annular sealing element in the annular groove and forms together with this a kind of labyrinth seal, which the annulus reliably seals between the inner and outer shaft.
- annular surface extending in the circumferential direction and outwardly open annular groove is formed on an outer circumferential surface of the inner shaft, in which an annular securing element is provided which on the one hand supports the inner shaft against the inner lateral surface of the outer shaft and thereby secures and on the other hand also formed as a sealing element is, which seals the annulus between the inner and the outer shaft.
- This embodiment has the advantage of providing a combined securing and sealing element, which, on the one hand, can reduce material costs by eliminating an additional sealing element and, on the other hand, reduces the production outlay.
- the securing element is formed physically separated from the sealing element, wherein the securing element is arranged in the same annular groove axially adjacent to the sealing element. It is also conceivable that the sealing element separately formed by the securing element is arranged in an axially spaced, second annular groove. This alternative offers the advantage that with physically separate sealing or securing elements An arrangement of the two can be adapted to individual requirements of the camshaft and thus a more flexible handling is achieved.
- the inner shaft axially end has a radially expanded region, with which the inner shaft is secured against the inner mantle surface of the outer shaft.
- Such an axially widened area can for example be generated on a lathe, so that the securing device is formed integrally with the inner shaft.
- a safety device produced in this way can be produced particularly accurately on the lathe.
- annular groove in which a sealing element is arranged, which seals the annular space between the inner and the outer shaft.
- Such an annular groove can also be manufactured on the lathe in one step with the manufacture of the securing device, so that not only the securing device itself, but at the same time a seat for an annular sealing element can be produced by means of the lathe.
- other manufacturers processing such as upsetting with subsequent processing on the lathe conceivable.
- FIG. 1 shows a camshaft having an axially end arranged and radially inwardly set back stage for receiving the safety device
- FIG. 2 shows a camshaft with a locking device designed as a head bolt
- FIG. 3 shows a camshaft as in FIG. 1, but with a different securing device, FIG.
- FIG. 4 shows a representation as in FIG. 3, but with a physically separate securing and sealing element
- Fig. 5 is a representation as in Fig. 3, but with a securing device in the form of a radially expanded portion of the inner shaft.
- the 1 has a camshaft 1, which is used in particular in motor vehicle engines, with the camshaft axis 2 at a limited circumferential angle against each other. the rotatable cam 3, 4 on.
- the mutually rotatable cam first cam 3 which are fixedly connected to an inner shaft 5
- second cam 4 which are fixedly connected to an outer shaft 6.
- the inner shaft 5 is coaxial with and mounted within the outer shaft 6.
- the outer shaft 6 is preferably formed as a circular cylindrical tube with a continuous same inner diameter d and thereby has a stepless inner circumferential surface 9.
- the outer shaft 6 has for this purpose in the circumferential direction slot-like openings 8, which allow the pin 7 can be adjusted in the circumferential direction.
- intake valves and exhaust valves of cylinders can be controlled in a known manner via cams 3 and 4 which can be adjusted to one another in this way, wherein, for example, valve overlap times can be changed while simultaneously changing the valve opening time of the intake valves.
- the inner shaft 5 is now supported directly against the stepless inner circumferential surface 9 of the outer shaft 6 via at least one securing device 10 arranged axially at the end of the inner shaft 5 and thereby secured.
- the securing device 10 has a fixedly connected to the inner shaft 5 and annularly formed securing element 11, which is arranged in the region of an axially on the inner shaft 5 arranged end and radially inwardly recessed peripheral stage 12.
- the fuse element 11 can be shrunk onto the inner shaft 5, for example by means of a shrink fit, and thereby firmly connected thereto.
- annular sealing element 14 is arranged, which seals an annular space 15 between the inner shaft 5 and the outer shaft ⁇ .
- the annular space 15 is filled, for example, with a lubricant, so that a sliding mounting of the inner shaft 5 is achieved against the outer shaft 6.
- the safety device 10 ensures the coaxiality between the inner shaft 5 and the outer shaft 6 both during insertion of the pins 7 in the inner shaft 5 and in a subsequent transport operation of the camshaft 1.
- the coaxiality between the two shafts 5, ⁇ is for trouble-free operation of the camshaft 1 essential, so that the safety device 10 makes a high contribution to quality assurance.
- the inner shaft 5 is arranged coaxially with the outer shaft 6, wherein for the attachment of the first cam 3 via the pins 7 already in Fig. 1 should apply.
- the securing device 10 ' according to FIG. 2 has a head bolt-like securing element 16, which is fixed axially endwise in the inner shaft 5 with a partial region of its shank 17 and which the inner shaft 5 via an outer peripheral surface 19 of its head region 18 secured against the inner circumferential surface 9 of the outer shaft 6.
- the shaft region 17 is connected to the inner shaft 5, for example via a press fit, and thereby fixes the securing element 11 'both in the axial direction and in the radial direction with respect to the inner shaft 5.
- annular space 15 between the inner shaft 5 and Outer shaft 6 seals. Also by the securing device 10 'according to FIG. 2, a coaxiality between the inner shaft 5 and the outer shaft 6 can be reliably ensured both during assembly of the camshaft 1 and during a subsequent transport thereof.
- a camshaft 1 is shown, in which with respect to the structure and the arrangement of the inner shaft 5, the outer shaft 6 and the cams 3 and 4 is referred to the statements made to Fig. 1.
- On an outer circumferential surface of the inner shaft 5 of FIG. 3 is a circumferentially extending and outwardly open annular groove 13 '', in which an annular securing element H '' is provided, which secures the inner shaft 5 against the inner circumferential surface 9 of the outer shaft 6.
- the securing element H '' either at the same time as a sealing element 14 '' be formed and in addition to its security tasks, the sealing of the annular space 15 between the inner shaft 5 and the outer shaft 6 take over.
- the fuse element H '''as shown in Fig. 4 may be physically separated from the sealing element 14''' and adjacent to this in the annular groove 13 '''of FIG. 4, which is then formed axially wider, arranged , It is also conceivable that the sealing element 14 '''in an adjacent to the annular groove 13''' arranged annular groove 13 '''' is embedded, which is indicated in FIG. 4 only with broken line drawn.
- an axially extending channel 20 may be provided, which is formed between a bearing 24 of the outer shaft 6 and an outer circumferential surface 21 of the outer shaft 6 by a recess in the outer circumferential surface 21.
- the channel 20 serves as a lubricant channel in order to reduce, for example, an axially end of the inner shaft 5 pending oil pressure and thereby reduce axial load on the inner shaft 5 can.
- a lubricant channel in order to reduce, for example, an axially end of the inner shaft 5 pending oil pressure and thereby reduce axial load on the inner shaft 5 can.
- the inner shaft 5 has a radially widened region 22 at the axial end, with which the inner shaft 5 is secured against the inner circumferential surface 9 of the outer shaft 6.
- the radially expanded region 22 can be produced on a lathe, in which respect, for example, an adjacent region 23 is radially tapered.
- the annular space 15 between the outer shaft 6 and the inner shaft 5 is created.
- the radially widened region 22 of the inner shaft 5 has an outwardly open annular groove 13 '''''on. In this annular groove 13 '"" is the sealing element 14 "" and seals the annular space 15 between the inner shaft 5 and the outer shaft 6 from.
- Each of the sealing elements 14 to 14 '''' is preferably formed as an outer clamping ring and thus firmly adheres to the inner circumferential surface 9 of the outer shaft 6 and engages with its sealing lip radially inwardly into the annular groove 13 to 13 '''' of the respective embodiment 1 to 5.
- each of the sealing elements 14 to 14 "'forms a labyrinth seal with the respectively associated annular groove 13 and thus reliably seals the annular space 15.
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 (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005062207A DE102005062207A1 (en) | 2005-12-24 | 2005-12-24 | Camshaft especially for motor vehicle engines has coaxial inner and outer camshafts with inner shaft being secured on inner surface of outer shaft |
PCT/DE2006/002229 WO2007076797A1 (en) | 2005-12-24 | 2006-12-13 | Camshaft |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1963625A1 true EP1963625A1 (en) | 2008-09-03 |
EP1963625B1 EP1963625B1 (en) | 2010-07-28 |
Family
ID=37905857
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06828664A Expired - Fee Related EP1963625B1 (en) | 2005-12-24 | 2006-12-13 | Camshaft |
Country Status (5)
Country | Link |
---|---|
US (1) | US7802549B2 (en) |
EP (1) | EP1963625B1 (en) |
BR (1) | BRPI0620617B1 (en) |
DE (3) | DE202005021716U1 (en) |
WO (1) | WO2007076797A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10352199B2 (en) | 2015-11-06 | 2019-07-16 | Mahle International Gmbh | Camshaft |
EP3633157A1 (en) * | 2018-10-04 | 2020-04-08 | Mechadyne International Limited | Concentric camshaft axial position control |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006226400A (en) * | 2005-02-17 | 2006-08-31 | Jtekt Corp | Shaft device |
US8459220B2 (en) | 2007-10-16 | 2013-06-11 | Magna Powertrain Inc. | Concentric phaser camshaft and a method of manufacture thereof |
DE102009009664A1 (en) * | 2009-02-19 | 2010-08-26 | Mahle International Gmbh | camshaft |
DE102009049218A1 (en) * | 2009-10-13 | 2011-04-28 | Mahle International Gmbh | Camshaft for an internal combustion engine |
IN2012DN01814A (en) * | 2009-12-07 | 2015-06-05 | Mitsubishi Motors Corp | |
EP2386729A1 (en) * | 2010-05-10 | 2011-11-16 | Fiat Powertrain Technologies S.p.A. | Multi-cylinder internal combustion engine with variable actuation of the engine valves |
DE102011052819A1 (en) | 2011-08-18 | 2013-02-21 | Thyssenkrupp Presta Teccenter Ag | Camshaft, in particular for motor vehicle engines |
DE102011052823A1 (en) * | 2011-08-18 | 2013-02-21 | Thyssenkrupp Presta Teccenter Ag | Camshaft, in particular for motor vehicle engines |
DE102011052822A1 (en) * | 2011-08-18 | 2013-02-21 | Thyssenkrupp Presta Teccenter Ag | Camshaft, in particular for motor vehicle engines |
DE102012203145A1 (en) | 2012-02-29 | 2013-08-29 | Mahle International Gmbh | Adjustable camshaft |
DE102012207076A1 (en) * | 2012-04-27 | 2013-10-31 | Mahle International Gmbh | Method for manufacturing hollow outer shaft for cam shaft, involves repeating rotating step and extending step until oblong hole is punched in outer shaft in which pin is guided, where pin connects cam with inner shaft |
DE102012106856B4 (en) | 2012-07-27 | 2019-05-29 | Thyssenkrupp Presta Teccenter Ag | Adjustable camshaft |
DE102012220652A1 (en) | 2012-11-13 | 2014-05-15 | Mahle International Gmbh | camshaft |
DE102013211159A1 (en) | 2013-06-14 | 2014-12-31 | Mahle International Gmbh | Adjustable camshaft |
DE102015215292A1 (en) * | 2015-08-11 | 2017-02-16 | Thyssenkrupp Ag | Method and device for mounting an adjustable camshaft |
DE102016224040A1 (en) * | 2016-12-02 | 2018-06-07 | Thyssenkrupp Ag | Method for mounting at least one sealing ring on a camshaft in a bearing lane of an internal combustion engine, and a camshaft with at least one sealing ring mounted in this way |
EP3575014A1 (en) | 2018-05-28 | 2019-12-04 | Vincenz Wiederholt GmbH | Shock absorber tube and method for its production |
US20210277256A1 (en) * | 2018-07-13 | 2021-09-09 | Akzo Nobel Coatings International B.V. | Tie-coat composition |
USD903413S1 (en) | 2018-08-09 | 2020-12-01 | Sharkninja Operating Llc | Cooking basket |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3803685A1 (en) * | 1988-02-07 | 1989-08-17 | Emitec Emissionstechnologie | CAMSHAFT |
DE3943426C1 (en) * | 1989-12-22 | 1991-04-11 | Gkn Automotive Ag, 5200 Siegburg, De | |
DE4201473C2 (en) | 1991-02-01 | 1994-06-30 | Volkswagen Ag | Control device for charge exchange valves of an internal combustion engine with at least one deactivatable cam on a camshaft |
DE9320451U1 (en) * | 1993-03-03 | 1994-09-15 | Amborn, Peter, Dr.-Ing., 53819 Neunkirchen-Seelscheid | Camshaft arrangement with interlocking shaft elements |
US5664463A (en) * | 1993-03-03 | 1997-09-09 | Amborn; Peter | Camshaft assembly with shaft elements positioned one inside the other and method of producing same |
JPH07224617A (en) * | 1994-02-09 | 1995-08-22 | Unisia Jecs Corp | Valve timing control device for internal combustion engine |
DE19802484C2 (en) * | 1998-01-23 | 2000-06-08 | Daimler Chrysler Ag | Method and device for producing assembled camshafts |
DE19934405B4 (en) * | 1999-07-22 | 2005-10-20 | Daimler Chrysler Ag | Hollow shaft with internal channels, in particular oil channels |
ATE331121T1 (en) | 1999-12-30 | 2006-07-15 | Thyssenkrupp Presta Ag | SHAFT AS A MACHINE COMPONENT WITH INTEGRATED CABLES |
GB2369175A (en) * | 2000-11-18 | 2002-05-22 | Mechadyne Plc | Variable phase coupling |
DE102004020124A1 (en) | 2004-04-24 | 2005-11-17 | Aft Atlas Fahrzeugtechnik Gmbh | Device for adjusting valve timing and internal combustion engine with such a device |
DE102005014680A1 (en) * | 2005-02-03 | 2006-08-10 | Mahle International Gmbh | Camshaft with mutually rotatable cam for motor vehicles in particular |
-
2005
- 2005-12-24 DE DE202005021716U patent/DE202005021716U1/en not_active Expired - Lifetime
- 2005-12-24 DE DE102005062207A patent/DE102005062207A1/en not_active Withdrawn
-
2006
- 2006-12-13 DE DE502006007559T patent/DE502006007559D1/en active Active
- 2006-12-13 US US12/158,878 patent/US7802549B2/en active Active
- 2006-12-13 BR BRPI0620617A patent/BRPI0620617B1/en not_active IP Right Cessation
- 2006-12-13 WO PCT/DE2006/002229 patent/WO2007076797A1/en active Application Filing
- 2006-12-13 EP EP06828664A patent/EP1963625B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2007076797A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10352199B2 (en) | 2015-11-06 | 2019-07-16 | Mahle International Gmbh | Camshaft |
EP3633157A1 (en) * | 2018-10-04 | 2020-04-08 | Mechadyne International Limited | Concentric camshaft axial position control |
WO2020070597A1 (en) * | 2018-10-04 | 2020-04-09 | Mechadyne International Limited | Concentric camshaft axial position control |
Also Published As
Publication number | Publication date |
---|---|
DE202005021716U1 (en) | 2009-07-02 |
BRPI0620617B1 (en) | 2018-11-27 |
DE102005062207A1 (en) | 2007-06-28 |
US7802549B2 (en) | 2010-09-28 |
US20100000477A1 (en) | 2010-01-07 |
WO2007076797A1 (en) | 2007-07-12 |
BRPI0620617A2 (en) | 2011-11-16 |
EP1963625B1 (en) | 2010-07-28 |
DE502006007559D1 (en) | 2010-09-09 |
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