EP3673157A1 - Valve drive for an internal combustion engine - Google Patents
Valve drive for an internal combustion engineInfo
- Publication number
- EP3673157A1 EP3673157A1 EP18742452.8A EP18742452A EP3673157A1 EP 3673157 A1 EP3673157 A1 EP 3673157A1 EP 18742452 A EP18742452 A EP 18742452A EP 3673157 A1 EP3673157 A1 EP 3673157A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- camshaft
- cam
- cam curve
- valve drive
- valve
- 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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- 239000000969 carrier Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004381 surface treatment 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
- 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
-
- 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
- F01L1/053—Camshafts overhead type
-
- 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
- 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
-
- 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
- F01L2001/0476—Camshaft bearings
-
- 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 valve drive for a cylinder head of a
- the technical environment is referred to, for example, the European
- Patent Application EP 0 595 060 A1 From this
- a valve train of an internal combustion engine which has axially displaceable on a camshaft preloaded sliding cam.
- the sliding cams are in a first position in which you act on a first elevation curve intake valves can be moved to a second position in which you act on the inlet valves with a second survey curve.
- the shift cams engage positively against a stop of a transmission element connected between the intake valves and the shift cams as long as they run with a section in the area of the stop.
- Upon reaching the base circle of the sliding cam these are moved to the second position.
- Another example of sliding cam is for example from the
- German Offenlegungsschrift DE 10 2005 006 489 A1 It is a camshaft arrangement which has a basic shaft and arranged thereon, axially displaceable but non-rotatably held cam carrier. There are cams with several on the cam carriers
- the cams actuate valve actuators of associated cylinders.
- actuators for performing switching operations wherein in the switching operations by axial displacement of cam carriers on the fundamental shaft another of the cam curves of the cam comes into contact with the valve actuating means.
- German Offenlegungsschrift DE 10 2004 022 833 A1 discloses a further valve drive for an internal combustion engine.
- This valvetrain comprises a camshaft having a sliding cam device which has adjacent cam-acting camshafts having different cam shapes and lift curves, which cam curves cooperate with control pins having control pins for adjusting the cam means.
- German patent DE 10 2009 057 633 B3 a method for producing a built camshaft, and a camshaft main body and a built camshaft are known.
- This patent protects a method for producing a built-up camshaft with at least one rotationally fixed, axially displaceably arranged on a camshaft base body cam member and at least one rotationally fixed and axially not
- Cam element comprising the following method steps: Providing a rod-shaped camshaft main body,
- Camshaft body to an enlarged outside diameter
- Camshaft base is dimensioned
- Object of the present invention is to avoid the above-mentioned disadvantages.
- Another object of the present invention is to prevent axial displacement of the camshaft during operation of the internal combustion engine.
- the embodiment of the Axialarret ist according to claim 2 is a preferred embodiment.
- the angular range according to claim 4 is a particularly preferred angular range. With the embodiment according to claim 5, the friction is minimized again.
- the switching process is significantly simplified and minimized wear.
- FIG. 1 shows a plan view of a valve drive according to the invention.
- Figure 2 shows a plan view of the valve gear according to the invention with a locking device.
- FIG. 3 shows a section through a locking element of FIG
- Figure 4 shows a section through the Axialarret mich.
- Figure 5 shows a section through the locking element in operative connection with the Axialarret ist.
- FIG. 1 shows a plan view of a valve drive 1 according to the invention for a cylinder head of an internal combustion engine. The not numbered
- Cylinder head is shown without valve cover, so that the valve gear 1 is visible.
- the valve drive 1 is arranged on the inlet side and is for two cylinders with four gas chambers acting equally, shown in Fig. 2
- valve train 1 has one in a first and a second camshaft bearing 2, 3 and others, not numbered
- Camshaft bearings rotatably mounted first camshaft 4.
- the first camshaft 4 has in the present embodiment, four cams 5 for four gas exchange valves, not shown, for two cylinders of the internal combustion engine, wherein only one cam 5 is numbered.
- the cam 5 has a first cam curve 6 and a second cam curve 7 different from the first cam curve 6.
- the gas exchange valve via an intermediate element, such. B. a
- a camshaft section 8 is provided, with radially outwardly encircling control grooves in which a non-visible pin of an actuating means 9 engages, so that the camshaft 4 with the cam 5 is displaceable such that the gas exchange valve either via the first or the second
- Cam curve 6, 7 is actuated.
- the camshaft 4 and the cam 5 are preferably of uniform material and in one piece.
- the cam can also be shrunk or joined to the camshaft 4.
- a spur gear 17 is provided, which is drivable by a further, not numbered gear.
- an axial locking 10 shown in the following figures is for the axially displaceable
- FIG. 2 shows a plan view of the Axialarret ist 10 for the first
- Camshaft 4 The first camshaft 4 has two cams 5 in Figure 2, again only a single cam 5 is numbered. Clearly visible in Figure 2 are the first cam curve 6 and the second, from the first
- Cam curve 6 different cam curve 7.
- a drive gear, the spur gear, for the camshaft 4 is in turn numbered 17.
- the Axialarret ist 10 is shown in Figure 4 radially around the camshaft 4 circumferential gate 1 1 with a first and a second, axially adjacent cam track 12, 13, in which a biased by a spring element 14 locking member 15 engages.
- the biased by the spring element 14 locking element 15 is arranged in a bracket 21.
- the Axialarret réelle 10 is mounted with a screw 18 to the first camshaft 4.
- Figure 3 shows a section through the bracket 21 with the through the
- the bracket 21 has two mounting holes 23.
- the locking element 15 is biased by the spring 14 pin, wherein the bias is adjustable by a cap nut 22.
- FIG. 4 shows a section through the Axialarret ist 10 without the
- the link 1 1 with the first and the second axially adjacent link track 12, 13 is radially mounted on the camshaft 4 in the present embodiment via a rolling bearing 25, in the present embodiment, a ball bearing. In another embodiment, it may also be a sliding bearing.
- a camshaft axis is numbered 16.
- An angle between the second slide track 13 and the camshaft axis 16 is designated by ⁇ .
- the first and the second slide track 12, 13 axially spaced from each other by a cylindrical portion 24.
- the first and the second form Sliding link 12, 13 with the camshaft axis 16 an angle between
- FIG. 5 shows a section through the locking element 15 and the link 11.
- the bias by the spring element 14 is shown by an arrow on the locking element 15 in the direction of backdrop 1 1.
- a displacement of the locking element 15 via the gate 1 1 is numbered at 26. This displacement path 26 corresponds to the width of a cam curve 6, 7.
- An angle between the slide tracks 12, 13 is denoted by ß.
- the link 1 1 via the slide tracks 12, 13 and the cylindrical portion 24 has an axial groove in which the locking element 15 is axially displaceable.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017214793.8A DE102017214793A1 (en) | 2017-08-24 | 2017-08-24 | Valve train for an internal combustion engine |
PCT/EP2018/069085 WO2019037945A1 (en) | 2017-08-24 | 2018-07-13 | Valve drive for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3673157A1 true EP3673157A1 (en) | 2020-07-01 |
EP3673157B1 EP3673157B1 (en) | 2024-05-29 |
Family
ID=62948103
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18742452.8A Active EP3673157B1 (en) | 2017-08-24 | 2018-07-13 | Valve drive for an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US11002162B2 (en) |
EP (1) | EP3673157B1 (en) |
CN (1) | CN110753784B (en) |
DE (1) | DE102017214793A1 (en) |
WO (1) | WO2019037945A1 (en) |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5129407A (en) * | 1991-06-10 | 1992-07-14 | J. D. Phillips Corporation | Variable camshaft |
DE4236655A1 (en) | 1992-10-30 | 1994-05-05 | Porsche Ag | Valve drive for an internal combustion engine |
DE102004022833A1 (en) | 2004-05-08 | 2005-12-01 | Dr.Ing.H.C. F. Porsche Ag | Valve train for internal combustion engine, has valves with respective cam units having cam tracks, tappets provided between cam tracks and valves and transmission pivots made of single piece with housings of tappets |
DE102005006489B4 (en) | 2005-02-12 | 2015-11-19 | Audi Ag | camshaft arrangement |
DE102007061353A1 (en) * | 2007-12-21 | 2009-06-25 | Audi Ag | Valve drive unit for improving the thermodynamics of combustion engines comprises units for axially moving cam supports on a camshaft and having a peripheral endless groove and a meshing element which moves along the groove |
DE102009057633B3 (en) | 2009-12-09 | 2011-03-31 | Thyssenkrupp Presta Teccenter Ag | Method of making a built camshaft, camshaft body and camshaft |
DE102010063389A1 (en) * | 2010-12-17 | 2012-06-21 | Schaeffler Technologies Gmbh & Co. Kg | Adjustment system for gas exchange valves of reciprocating internal combustion engines |
DE102011011456A1 (en) * | 2011-02-17 | 2012-08-23 | Daimler Ag | Internal combustion engine valve train device |
DE102011101400B4 (en) * | 2011-05-13 | 2013-02-07 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Valve train for internal combustion engines for actuating gas exchange valves |
US9745875B2 (en) * | 2012-08-22 | 2017-08-29 | Toyota Jidosha Kabushiki Kaisha | Variable valve gear for internal combustion engine |
DE102013111410A1 (en) * | 2013-10-16 | 2015-04-16 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Valve train for an internal combustion engine and internal combustion engine |
KR101461906B1 (en) * | 2013-10-16 | 2014-11-17 | 현대자동차주식회사 | Connecting structure of mutiple variable valve lift appratus |
JP6331926B2 (en) * | 2014-09-26 | 2018-05-30 | スズキ株式会社 | Variable valve operating device for internal combustion engine |
KR101619251B1 (en) * | 2014-09-30 | 2016-05-10 | 현대자동차 주식회사 | Engine practicable cda |
US9500104B2 (en) * | 2014-09-30 | 2016-11-22 | Hyundai Motor Company | Variable valve lift apparatus |
DE102015103761A1 (en) * | 2015-03-13 | 2016-09-29 | Kendrion (Villingen) Gmbh | Control element for the axial displacement of a camshaft slidably mounted along a camshaft axis |
DE102015012287A1 (en) * | 2015-09-23 | 2017-03-23 | Audi Ag | Valve train for an internal combustion engine |
JP6686454B2 (en) * | 2016-01-12 | 2020-04-22 | いすゞ自動車株式会社 | Cam switching device |
DE102016200424A1 (en) * | 2016-01-15 | 2017-07-20 | Schaeffler Technologies AG & Co. KG | Variable valve train |
DE102016206060A1 (en) * | 2016-04-12 | 2017-10-12 | Schaeffler Technologies AG & Co. KG | Variable valve train |
DE102016208392A1 (en) * | 2016-05-17 | 2017-11-23 | Schaeffler Technologies AG & Co. KG | camshaft |
-
2017
- 2017-08-24 DE DE102017214793.8A patent/DE102017214793A1/en active Pending
-
2018
- 2018-07-13 CN CN201880040499.5A patent/CN110753784B/en active Active
- 2018-07-13 EP EP18742452.8A patent/EP3673157B1/en active Active
- 2018-07-13 WO PCT/EP2018/069085 patent/WO2019037945A1/en unknown
-
2020
- 2020-02-21 US US16/797,169 patent/US11002162B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US11002162B2 (en) | 2021-05-11 |
EP3673157B1 (en) | 2024-05-29 |
WO2019037945A1 (en) | 2019-02-28 |
US20200191025A1 (en) | 2020-06-18 |
CN110753784B (en) | 2021-09-03 |
DE102017214793A1 (en) | 2019-02-28 |
CN110753784A (en) | 2020-02-04 |
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