EP1307637A1 - Kolbenbrennkraftmaschine mit deaktivierbaren, mechanisch betätigten gaswechselventilen - Google Patents
Kolbenbrennkraftmaschine mit deaktivierbaren, mechanisch betätigten gaswechselventilenInfo
- Publication number
- EP1307637A1 EP1307637A1 EP01969516A EP01969516A EP1307637A1 EP 1307637 A1 EP1307637 A1 EP 1307637A1 EP 01969516 A EP01969516 A EP 01969516A EP 01969516 A EP01969516 A EP 01969516A EP 1307637 A1 EP1307637 A1 EP 1307637A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- partial
- piston
- roller
- lever
- gas exchange
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
-
- 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
- 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
- F01L2001/186—Split rocking arms, e.g. rocker arms having two articulated parts and means for varying the relative position of these parts or for selectively connecting the parts to move in unison
-
- 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
-
- 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
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
- Y10T74/2107—Follower
Definitions
- the invention has for its object to provide a piston internal combustion engine with deactivatable gas exchange valves, which has a simple structure of the valve trains.
- a piston internal combustion engine with deactivatable, mechanically operated gas exchange valves each of which is actuated by at least one camshaft via a roller rocker arm with roller, which consists of two partial levers which are articulated to one another via an articulated axis, on which the roller assigned to a cam of the camshaft is rotatably mounted, and with a roller acting between the two partial levers same switchable locking means by which the power transmission between the camshaft and the gas exchange valve can be activated or deactivated, the free end of the one partial lever being supported on the gas exchange valve and a support being provided for the free end of the other partial lever on the engine block, and with a between the return spring, which presses the roller on the cams when the partial levers are unlocked.
- the part of the gas exchange valve associated with the support has an extension, which extends over the hinge axis and covers a region of the part of the lever associated with the support, and that the locking means covers the region of the two that overlaps with the scissors Partial lever is assigned.
- the locking means is formed by a piston-cylinder unit which can be pressurized with oil, which is arranged in the partial lever assigned to the support and which has a locking element which can be displaced parallel to the joint axis and has a piston part and a locking part having.
- the locking part and the piston part can be derte components be formed or connected in one piece in an advantageous embodiment of the invention. It is useful here if a return spring is provided, which holds the locking element in its locked position, so that in normal operation the two partial levers are locked together and are only unlocked when the piston-cylinder unit is pressurized with pressure oil, thus deactivating the corresponding gas exchange valve ,
- the supply of the piston-cylinder unit with pressure oil takes place via a hydraulic lash adjuster forming the support.
- a hydraulic lash adjuster is already present in the arrangement of roller rocker arms, so that for the pressure oil supply to the piston-cylinder unit, only a corresponding pressure oil channel is to be provided in the partial lever resting on the compensating element, which with the cylinder of the piston cylinder -Unit is connected.
- the spring force of the return spring of the piston-cylinder unit is dimensioned so that it is not compressed at the pressure level required for the play compensation and the given piston area, so that the role of the roller finger follower is always in contact with the cam.
- At least the one associated with the gas exchange valve te partial lever is claw-shaped and overlaps the roller in the area of the hinge axis, with a claw part forming the extension.
- Fig. 1 in a side view of a cam
- Fig. 2 shows the gas exchange valve. 5 in the deactivated state
- Fig. 3 shows a horizontal section. the line III-III through the roller rocker arm in Fig. 1 on a larger scale
- Fig. 6 shows a section through the locking area acc. the line VI-V in Fig. 5,
- Fig. 8 shows a partial longitudinal section. the line VIII-VIII in Fig. 7 in the locked position, Fig. 9 in partial longitudinal section. Fig. 8 the unlocked position.
- FIG. 1 shows a mechanical cam valve train for actuating a gas exchange valve 1.
- the gas exchange valve is provided on its shaft 2 with a spring plate 3, by means of which it is supported on a valve spring 4 and is held by the latter in the closed position.
- a roller rocker arm 5 is provided, which is essentially formed by a partial lever 5.1 and a partial lever 5.2.
- the two partial levers 5.1 and 5.2 are connected to one another in an articulated manner via an articulated axis 6, on which a roller 7 is freely rotatably supported, which abuts the cam 8 of the associated camshaft.
- the roller rocker arm 5 is supported with its free end assigned to the partial lever 5.1 on the valve stem 2. With its free end assigned to the partial lever 5.2, the roller rocker arm 5 is supported by a calotte on the movable part 9 of a hydraulic lash adjuster 10 of a known type, which is firmly connected to the engine block 11 and via a corresponding channel arrangement 12 in the engine block with a pressurized oil supply in Connection is established.
- a switchable locking means 13 is provided between the two partial levers 5.1 and 5.2, the structure and mode of operation of which will be explained in more detail below.
- the two partial levers 5.1 and 5.2 form a rigid unit, so that when the cam 8 rotates, the gas exchange valve is opened and closed in accordance with the lifting height of the cam 8.
- a return spring 14 arranged between the two partial levers 5.1 and 5.2 shown here only schematically as a helical compression spring, ensures that the two partial levers are pressed apart about the articulation axis 6 and thus the roller 7 when the two partial levers are unlocked with the control contour of the cam 8 remains in contact and is tracked on this.
- the two partial levers can swing both about the articulation axis 6 and about their supports at the end 2.1 of the valve stem on the one hand and on the support, here the movable part 9 of the hydraulic compensating element on the other hand.
- the locking means is correspondingly depressurized, so that the locking means can come into engagement again in the phase when the roller 7th is present via an existing return spring rests on area 8.1 of base circle area 8.1 of cam 8.
- the roller rocker arm 5 is shown in a horizontal section on a larger scale.
- the partial levers 5.1 and 5.2 are claw-like and encompasses the articulated axis 6 and the roller 7.
- An extension 5.3 on the partial lever 5.1 covers the partial lever 5.2 laterally, so that the two partial levers are relatively scissors-like in the unlocked state can pivot to each other.
- the locking means 13 is mounted in the partial lever 5.2.
- this consists of a cylinder 15 in which a piston part 16 is slidably mounted.
- a locking part 18 is slidably mounted against the force of a return spring 19.
- the cylinder 15 is connected to a pressure oil supply via a supply duct 20. If the cylinder 15 is pressurized by a correspondingly high pressure oil, then the piston part 16 pushes the locking part 18 against the force of the return spring 19 as far as it will go into its recess 17.
- the length of the locking part 18 is such that, in the unlocked state, as shown here, it enables the scissors-like relative movement of the two partial levers 5.1 and 5.2, the end faces of the locking part 18 on the one hand and the piston part 16 sliding on the other.
- the return spring 19 pushes the locking part 18 and the piston part 16 back into the cylinder 15 during the rolling time of the roller 7 on the base circle 8.1 of the cam, the locking part 18 in the part of the cylinder 15 that is then released engages and the two partial levers 5.1 and 5.2 are locked together.
- the restoring force must be large enough to push back that of the locking element very quickly.
- the locking element can be modified in such a way that the locking element also acts as a piston. For this it is necessary to change the direction of the force of the return spring and the oil pressure and to design the piston differently accordingly.
- a return spring arranged in the cylinder 15 presses the piston into the recess 17 in the depressurized state or at low oil pressure and locks the two partial levers against one another. If the part of the locking element designed as a piston is then pressurized in the opposite direction to the force of this spring, it is pushed back into the cylinder 15 and the locking part firmly connected to the piston is removed from the recess 17. pulled and releases the partial lever 5.1 compared to the partial lever 5.2.
- the play compensation element 10 consists essentially of a cylinder part 10.1, in which the hollow support part 9 is guided like a piston. Via the supply line 12, the interior of the movable part 9 is pressurized with a predetermined low pressure oil, so that in each temperature position the roller 7 rests against the cam 8 and the free end of the partial lever 5.1 rests on the end at point 1 of the valve stem 2 is guaranteed.
- the partial element 9 has a through hole 21 which is connected to the feed channel 20 and which, as shown in FIG. 3, opens into the cylinder 15.
- the play compensation element 10 is subjected to a correspondingly increased pressure which is so great that the return spring 17 of the type according to FIG. 3 is compressed and the locking part 18 is completely in its receptacle 17 in the extension 5.3 of the partial lever 5.1 is inserted and so the two partial levers are disengaged.
- roller rocker arm 5 is a modification of the embodiment according to. Fig. 1 shown.
- the roller rocker arm 5 is firmly supported on the engine block via a support bolt 10.1.
- the support bolt 10.1 is with a flow channel 11.1 provided, which is connected to the channel arrangement 12 of the pressure oil supply.
- the roller finger follower 5 is supported and the locking means 13 is acted upon as in the embodiment described above in accordance with FIG. 1 ff. Structure and function are so far identical, so that reference is made to the above description, the same components being provided with the same reference numerals.
- the arrangement of the return spring 14 makes it possible to dispense with a hydraulic valve play compensation element and thus to implement a valve train with mechanical play without using a rocker arm axis.
- the arrangement of the return spring 14 makes it possible for a contact closure between the roller 7 and the cam to be maintained both in the base circle and in the area of the cam ramp, even when the partial levers are locked against one another.
- the end region of the cylinder 15 is provided with a groove-shaped extension 15.1, which extends in the direction of the pivoting movement of the two partial lifts 5.1 and 5.2.
- Fig. 6 shows this arrangement in a section acc. the line VI-VI in Fig. 5, the arrangement being shown in the locked position.
- the locking part 18 engages in the groove-shaped extension 15.1 and is held in the locking position via the return spring 19, as described for FIG. 3. Due to the groove-like extension 15.1, the length of which approximately corresponds to the size of the valve clearance to be expected, it is possible that the two partial levers 5.1 and 5.2 can move relative to one another in the direction of the arrows 21 and 22.
- the return spring 14 ensures that the roller 7 always bears against the control contour 8.1 of the cam 8. Nonetheless, thermal or wear-related changes in length of the valve stem are compensated for, so that the valve is held reliably in the closed position by its valve spring as long as the roller 7 rolls on the base circle area 8.1 of the cam 8. As soon as the roller 7 runs onto the cam contour, the locking part 18 arrives at the end the groove-shaped extension 15.1 to the system so that the valve can be opened against the force of the valve spring 4 via the cams.
- valve in question If the valve in question is to be deactivated, the piston 16, as described above with reference to FIG. 3, is advanced via the oil pressure against the force of the return spring 19, so that the locking between the two partial levers 5.1 and 5.2 is released.
- FIG. 7 shows an embodiment of the locking means 13 which is modified compared to FIG. 3.
- the modification essentially consists in that the locking part 18.1 is integrally connected to the piston part 16.1 via a web part 16.2.
- the partial lever 5.1 has at its end facing the locking element 13 a locking lug 5.4, the width of which is dimensioned such that in the unlocking position shown in FIG. 7, the cylinder 15 is pressurized with oil, through the space between the piston part 16.1 and can pivot the locking part 18.1. If the cylinder 15 is depressurized, the return spring 19 presses the locking part 18.1 together with the piston back into the cylinder 15, so that the locking part 18.1 can engage under the locking nose 5.4 as soon as the roller 7 passes through the base circle area 8.1 in the cam 8.
- Fig. 8 shows how in the locked position the locking lug 5.4 is supported on the locking part 18.1. It can easily be seen that when the locking part 18.1 is moved into the position shown in FIG. 7, the locking nose 5.4 is released and the two partial levers 5.1 and 5.2 can pivot downwards in the direction of the two arrows, as shown in FIG. 9 is shown.
- the return spring is not shown here to simplify the drawing.
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)
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10038917 | 2000-08-09 | ||
DE10038917A DE10038917A1 (de) | 2000-08-09 | 2000-08-09 | Kolbenbrennkraftmaschine mit deaktivierbaren, mechanisch betätigbaren Gaswechselventilen |
PCT/EP2001/008624 WO2002012685A1 (de) | 2000-08-09 | 2001-07-26 | Kolbenbrennkraftmaschine mit deaktivierbaren, mechanisch betätigten gaswechselventilen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1307637A1 true EP1307637A1 (de) | 2003-05-07 |
EP1307637B1 EP1307637B1 (de) | 2006-03-01 |
Family
ID=7651888
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01969516A Expired - Lifetime EP1307637B1 (de) | 2000-08-09 | 2001-07-26 | Kolbenbrennkraftmaschine mit deaktivierbaren, mechanisch betätigten gaswechselventilen |
Country Status (5)
Country | Link |
---|---|
US (1) | US6655331B2 (de) |
EP (1) | EP1307637B1 (de) |
AT (1) | ATE318996T1 (de) |
DE (2) | DE10038917A1 (de) |
WO (1) | WO2002012685A1 (de) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10156646A1 (de) * | 2001-11-17 | 2003-05-28 | Volkswagen Ag | Ventiltrieb für Brennkraftmaschinen |
JP4026410B2 (ja) * | 2002-05-24 | 2007-12-26 | 三菱自動車工業株式会社 | 内燃機関の動弁装置 |
DE10226822A1 (de) * | 2002-06-15 | 2004-01-08 | Ina-Schaeffler Kg | Schlepphebel eines Ventiltriebs einer Brennkraftmaschine |
DE10226821A1 (de) | 2002-06-15 | 2003-12-24 | Ina Schaeffler Kg | Schlepphebel eines Ventiltriebs einer Brennkraftmaschine |
DE102004005594A1 (de) | 2004-02-04 | 2005-08-25 | Fev Motorentechnik Gmbh | Schlepphebel zur Hubumschaltung |
DE102005006954A1 (de) * | 2005-02-16 | 2006-08-17 | Schaeffler Kg | Schaltbarer Schlepphebel eines Ventiltriebs einer Brennkraftmaschine |
DE102005031241A1 (de) * | 2005-07-01 | 2007-01-04 | Fev Motorentechnik Gmbh | Variabler Ventiltrieb einer Kolben-Brennkraftmaschine |
DE102006033403A1 (de) * | 2006-07-19 | 2008-01-24 | Mahle International Gmbh | Nockentrieb |
JP5110690B2 (ja) | 2006-12-15 | 2012-12-26 | 現代自動車株式会社 | 気筒休止用ロッカーアーム装置 |
CN101225759B (zh) * | 2008-01-25 | 2010-06-09 | 许小法 | 可变气门升程装置 |
DE102008034092A1 (de) | 2008-07-21 | 2010-01-28 | Fev Motorentechnik Gmbh | Schaltbarer Ventilhebel für Ventiltriebe mit Ventilschaltfunktion mit einer gebogenen Schraubenfeder |
DE102008034090A1 (de) | 2008-07-21 | 2010-01-28 | Fev Motorentechnik Gmbh | Schaltbarer Ventilhebel für Ventiltriebe mit Ventilabschaltung mit einer Flachformfeder |
DE102014205813A1 (de) * | 2014-03-28 | 2015-10-01 | Aktiebolaget Skf | Ventilsteuerung und Verfahren zur Ventilsteuerung |
CN107060936A (zh) * | 2017-02-10 | 2017-08-18 | 中国第汽车股份有限公司 | 一种发动机闭缸机构 |
US10605126B2 (en) * | 2018-04-17 | 2020-03-31 | Delphi Technologies Ip Limited | Switchable rocker arm |
US11300014B2 (en) * | 2018-12-06 | 2022-04-12 | Jacobs Vehicle Systems, Inc. | Valve actuation system comprising finger follower for lobe switching and single source lost motion |
US11208921B2 (en) * | 2018-12-06 | 2021-12-28 | Jacobs Vehicle Systems, Inc. | Finger follower for lobe switching and single source lost motion |
CN113167144B (zh) * | 2018-12-06 | 2023-01-24 | 雅各布斯车辆***公司 | 用于凸角切换和单源空动的指状随动件 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH027204Y2 (de) * | 1984-12-25 | 1990-02-21 | ||
US4768467A (en) * | 1986-01-23 | 1988-09-06 | Fuji Jukogyo Kabushiki Kaisha | Valve operating system for an automotive engine |
US5022360A (en) * | 1990-10-15 | 1991-06-11 | Chrysler Corporation | Valve actuator for overhead camshaft engine |
JP3268847B2 (ja) * | 1992-09-19 | 2002-03-25 | マツダ株式会社 | エンジンのバルブ駆動装置 |
US5544626A (en) * | 1995-03-09 | 1996-08-13 | Ford Motor Company | Finger follower rocker arm with engine valve deactivator |
US5660153A (en) * | 1995-03-28 | 1997-08-26 | Eaton Corporation | Valve control system |
US5657726A (en) * | 1996-01-16 | 1997-08-19 | Ford Global Technologies, Inc. | Rocker arm assembly for an internal combustion engine |
US5653198A (en) * | 1996-01-16 | 1997-08-05 | Ford Motor Company | Finger follower rocker arm system |
GB2322410B (en) * | 1997-02-21 | 2000-06-14 | T & N Technology Ltd | Valve operating mechanisms |
-
2000
- 2000-08-09 DE DE10038917A patent/DE10038917A1/de not_active Withdrawn
-
2001
- 2001-07-26 WO PCT/EP2001/008624 patent/WO2002012685A1/de active IP Right Grant
- 2001-07-26 DE DE50109098T patent/DE50109098D1/de not_active Expired - Lifetime
- 2001-07-26 EP EP01969516A patent/EP1307637B1/de not_active Expired - Lifetime
- 2001-07-26 AT AT01969516T patent/ATE318996T1/de not_active IP Right Cessation
-
2003
- 2003-02-10 US US10/361,012 patent/US6655331B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0212685A1 * |
Also Published As
Publication number | Publication date |
---|---|
US6655331B2 (en) | 2003-12-02 |
EP1307637B1 (de) | 2006-03-01 |
WO2002012685A1 (de) | 2002-02-14 |
DE10038917A1 (de) | 2002-02-21 |
ATE318996T1 (de) | 2006-03-15 |
DE50109098D1 (de) | 2006-04-27 |
US20030159669A1 (en) | 2003-08-28 |
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