WO2002040833A1 - Mechanisches ventilspielausgleichselement für einen ventiltrieb an einer kolbenbrennkraftmaschine - Google Patents
Mechanisches ventilspielausgleichselement für einen ventiltrieb an einer kolbenbrennkraftmaschine Download PDFInfo
- Publication number
- WO2002040833A1 WO2002040833A1 PCT/EP2001/012157 EP0112157W WO0240833A1 WO 2002040833 A1 WO2002040833 A1 WO 2002040833A1 EP 0112157 W EP0112157 W EP 0112157W WO 0240833 A1 WO0240833 A1 WO 0240833A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure part
- valve
- pressure
- torsion spring
- element according
- Prior art date
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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
Definitions
- valve clearance compensation element between the shaft end of the gas exchange valve on the one hand and the valve train acting on it (camshaft camshaft, valve actuation lever or the like Compensate for changes in the height of the shaft end when the gas exchange valve is closed compared to the valve train.
- a hydraulic valve lash compensation element is used, which essentially consists of a cup-shaped cylinder and a piston guided therein, the cylinder interior being pressurized with pressure oil, so that the two parts can be spread apart and each without play on
- a throttle point which is provided, for example, by a defined gap between the cylinder wall and the piston, can also change the height of the shaft end relative to the valve train during operation, be it through thermal expansion , be it by wear of the valve seat, can be compensated, since the total length of the valve clearance compensation element can be shortened via the oil drain through the throttle point.
- a throttle point which is provided, for example, by a defined gap between the cylinder wall and the piston, can also change the height of the shaft end relative to the valve train during operation, be it through thermal expansion , be it by wear of the valve seat, can be compensated, since the total length of the valve clearance compensation element can be shortened via the oil drain through the throttle point.
- Such hydraulic valve lash adjusters have proven their worth and are used today in practically all piston internal combustion engines.
- the invention is based on the object of eliminating the disadvantages described above by means of a mechanical valve lash adjuster with a simple structure and high functionality.
- a mechanical valve lash adjuster for a valve train on a piston internal combustion engine with a first pressure part which is axially displaceable relative to a second pressure part and rotatable about the displacement axis, and with one between the first pressure part and the second pressure part effective, axially flexible at least limited
- Torsion spring element furthermore with at least one spiral surface on the first pressure part, to which a corresponding spiral surface on the second pressure part is assigned on the one hand and which form a spiral surface pair, the surfaces of the spiral surface pair being designed as a rough surface and being pressed together by the torsion spring element.
- valve lash adjuster in the rest state, which corresponds to the closed position of the gas exchange valve, the action of the torsion spring element pushes the two pressure parts apart to eliminate any play, but with their spiral surfaces lie against each other.
- the valve train can be formed directly by the cam of a camshaft or via valve actuation levers (rocker arms, rocker arms or the like). This ensures that any play is compensated for by the low force between the two pressure parts during the closing time of the valve.
- the roughened surface prevents the two pressure parts from rotating relative to one another, so that a shortening of the compensating element in the form of screwing together is prevented.
- the roughened surface is designed as a form-fitting surface, for example in the form of a stair profile with inclined step surfaces, so that only an increasing valve clearance can be compensated, since the step edges each prevent the pressure parts from turning back relative to one another in order to shorten the compensating element.
- the "step height" suitably corresponds to an approved work cycle.
- a further development provides a mechanical valve lash adjuster in which a sliding sleeve comprising the first pressure part is provided and an expansion spring element which is effective between the second pressure part and the sliding sleeve, and a further parallel, vertically offset spiral surface and a corresponding spiral surface on the first pressure part is assigned to the sliding sleeve and which likewise form a spiral surface pair, the surfaces of the one spiral surface pair being designed to be slidable and pressed together by the torsion spring element, and at least one surface of the other spiral surface pair being designed as a rough surface, the surfaces of which are small and form a work cycle AS Distance from each other stand and are only brought into contact with each other during the valve opening process.
- the elements lying against each other via the spiral surface pair are displaced against the force of the spreading spring in the direction of the second pressure part, so that after bridging a distance forming a working cycle, the spiral surfaces provided with rough surfaces Chenproject comes together to the plant.
- the surface roughness of the two roughened surfaces causes a form fit when touched, so that the two pressure parts form a rigid body in spite of the actuating force acting in the opening direction against the closing force of the valve spring, since twisting of the two pressure parts in the form of "screwing together" is not possible.
- the two pressure parts are pushed apart by the spreading spring, the two pressure parts being pressed apart by the force of the spreading spring between the two surfaces of the slidably designed spiral surface pair, and any existing valve play by relative rotation against one another, that is larger than the specified working cycle balanced.
- the slope of the spiral surface pairs running parallel to one another is chosen such that no self-locking can occur on the sliding surface spiral pair.
- the force effect of the spreading spring via the sliding surfaces on the torsion spring element is dimensioned significantly larger than the restoring force of the torsion spring element.
- Ventilation openings are provided for spaces which are enclosed by the pressure parts and / or a pressure part and the sliding sleeve. This avoids, on the one hand, that air cushions and / or oil accumulations can build up in these rooms and, on the other hand, this ensures that oil mist can penetrate these rooms, albeit with little ventilation, and thus the relatively moving surfaces of the individual Parts are lubricated.
- FIG. 1 shows a first embodiment of a mechanical valve lash adjuster in vertical section
- Fig. 2 shows a further development of the valve lash adjuster according to. 1 in vertical section
- Fig. 3 shows a section. the line III-III in Fig. 2,
- 5 shows an installation example for a valve train formed by a cam
- 6 shows an installation example for a valve train designed as a rocker arm
- FIG. 7 shows an installation example for a valve train designed as a rocker arm
- Fig. 8 shows an installation example with support anchors.
- FIG. 1 The schematic representation of an exemplary embodiment of a mechanical valve lash adjuster shows in FIG. 1 a first, for example stem-shaped or piston-shaped pressure part 1, which is axially displaceable relative to a second pressure part 2 and rotatable about the displacement axis A, which is, for example, cup-shaped or cylindrical is trained.
- the free end 14 of the second pressure part 2 is supported, for example, on a rocker arm 22 to be actuated.
- the first pressure part 1 is held stationary or is connected to a valve train.
- the first pressure part 1 is provided on its side facing the second pressure part 2 with a helical surface 9.1, to which a corresponding helical surface 9.2 on the second pressure part 2 is assigned.
- the mutually assigned spiral surfaces form a spiral surface pair 9.
- at least one spiral surface is designed as a rough surface, the coefficient of friction of this rough surface should be at least 0.4 ⁇ m.
- rough surface encompasses any surface structure which prevents the surfaces from sliding freely on one another. This can be formed by roughening or targeted shaping, for example via a tooth profile, a wave profile or a step profile with sloping step surfaces that are aligned at an angle to the helical surface.
- the profile depth or "roughness depth” is up to a few 1/10 milli- meters on both helical surfaces 9.1 and 9.2, so that form-fitting surfaces are formed which reliably prevent rotation of the two pressure parts when engaged.
- the helical surfaces 9.1 and 9.2 are in contact with each other over a considerable length, the surface pressure acting between them can be significantly reduced and wear can be minimized. It is also sufficient if the length of the helical surface corresponds approximately to the circumference of the pressure part, the slope having to be selected so that there is certainly no self-locking except for the inhibition of the roughness.
- the broken right side of the first pressure part 1 shows the course of the helical surface 9.2 on the second pressure part 2.
- a torsion spring element 10 Arranged between the first pressure part 1 and the second pressure part 2 is a torsion spring element 10, which is shown here as a spiral spring and which between the two pressure parts causes a restoring force which can twist the two pressure parts if there is play that is greater than is the specified roughness depth.
- the torsion spring element 10 is designed in such a way that when it is screwed together in the axial direction it is either axially displaceable in its anchoring or is also flexible in the axial direction, for example if a round cross-section is selected instead of a rectangular cross-section for the spiral.
- the end face 11 of the first pressure part 1 lies against a fixed anchorage or, as shown in FIG. 2, against the control contour 12 of a control cam 13.
- The, for example, convexly curved end face 14 of the second pressure part 2 lies against the free end of the valve stem 15 of a gas exchange valve or an actuating element 22.
- the schematic representation acc. Fig. 2 shows another, according to the embodiment.
- Fig. 1 developed embodiment for a mechanical valve lash adjuster.
- the second pressure part 2 is surrounded on its outside by a sliding sleeve 3, which is provided at its free end 4 with an end stop 5, which is assigned a collar-shaped extension 6 on the second pressure part 2.
- an expansion spring element 7 is arranged, for example in the form of a helical compression spring, through which the second pressure part 2 with its shoulder 6 is pressed against the end stop 5.
- the first pressure part 1 is provided on its side facing the second pressure part 2 and the sliding sleeve 3 with two parallel, height-offset spiral surfaces 8.1 and 9.1, each of which has a corresponding spiral surface 8.2 on the sliding sleeve 3 and a spiral surface 9.2 on the second
- the mutually assigned helical surfaces each form a helical surface pair 8 and 9.
- the helical surfaces 8.1 and 8.2 of the helical surface pair 8 are designed to be smooth and thus slidable, the coefficient of friction should expediently not exceed 0.2 ⁇ m.
- At least one spiral surface of the spiral surfaces 9.1 and 9.2 of the spiral surface pair 9 is designed as a rough surface.
- the broken right side of the first pressure part 1 shows the course of the helical surface 8.2 on the sliding sleeve 3 and the helical surface 9.2 on the second pressure part 2.
- the torsion spring element 10 is arranged, which causes the restoring force between the two pressure parts, which rotates the two pressure parts on the spiral surface pair 8 sliding.
- the sliding sleeve 3 together with the first pressure part 1 is pressed against the control contour 12 of the cam 13 via the spreading spring 7.
- the second pressure part 2 is pressed with its end face 14 against the end of the valve stem 15. This ensures that the valve clearance compensation element is held free of play between the cam 13 on the one hand and the valve stem 15 on the other.
- the lateral fixation depends on the respective installation situation, for which exemplary embodiments are given below.
- the force effect of the torsion spring 10 connecting the first and the second pressure part to one another is now oriented such that the torsion spring 10 tries to screw the two pressure parts into one another, so that a tight fit of the helical surface pair 8 is ensured.
- the two helical surface pairs 8 and 9 are arranged offset in height from each other by a measure of a few micrometers, so that a working cycle AS is present.
- a correspondingly predetermined play S between the shoulder 6 on the second pressure part 2 and the end stop 5 on the sliding sleeve 3 ensures that the overall arrangement between the control contour of the cam 13 and the valve stem 15 is free of play.
- the working cycle AS remains in a constant size.
- the design of the individual springs is such that the force effect of the spreading spring 7 via the sliding surfaces 8 on the torsion spring element 10 is dimensioned significantly larger than the restoring force of the torsion spring element 10.
- the force of the spreading spring 7 must be significantly less than the closing force of the Valve spring 16.
- Fig. 3 is a horizontal section through the embodiment acc. 13 is shown along the line III-III in FIG. 1.
- the spiral spring 10 is made of strip material and is held with its outer free end 10.1 in a corresponding groove 10.2 in the second pressure part 2, so that the longitudinal mobility specified by the working cycle AS is ensured.
- a strip material it may be appropriate to use a
- the torsion spring 10 designed as a spiral spring can be firmly clamped with both ends, since the round material ensures sufficient deformation in the axial direction.
- the horizontal cut applies to the execution acc. Fig. 1 accordingly.
- the space 10.3 surrounding the torsion spring element 10 is vented via the groove 10.2 which is open to the outside.
- the space 7.1 surrounding the spreading spring 7 is also vented via a corresponding groove, not shown here, so that no air cushion can build up in these rooms during the movement.
- FIG. 1 is a modification of the embodiment according to. Fig. 1 and Fig. 2, which is essentially only from the embodiment according to. Fig. 1 differs that the torsion spring 10 is designed as a leg spring and is mounted on the outside of the sliding sleeve 3 and is fixed at one end to the first pressure part 1, while the other end is fixed to the sliding sleeve 3.
- valve clearance compensation element VSA is held in a bearing body 19, which is guided in the cylinder head 20 so as to be displaceable.
- the bearing body 19 is directly associated with the end of the valve stem 15 with its valve spring 16, so that the cam 13 with its control contour 12 can act directly on the end face 21 of the bearing body 19.
- Fig. 6 the arrangement of the valve lash adjuster VSA according to the invention is shown schematically in a rocker arm 22 which rests with its one end via the valve lash adjuster VSA on the valve stem 15 and with its other end via a roller 23 on the cam 13 of the camshaft.
- Fig. 7 shows schematically the arrangement on a rocker arm 24, which is supported with one end directly on the valve stem 15 and with its other end on a valve lash adjuster VSA mounted in the cylinder head 20.
- the rocker arm 24 in turn rests on the control contour 12 of the cam 13 via a roller 23.
- the control contour 12 of the cam 13 can now be designed such that it is provided with a pre-cam at the beginning 12.1 of the opening stroke, which ensures that the working cycle AS is quickly overcome.
- Fig. 8 shows a modification of the arrangement according to. Fig. 6 with a valve lash adjuster according. Fig. 1.
- the rocker arm 22 is pivotally mounted on the valve lash adjuster VSA, which is supported on the engine block via a support anchor 25. The movement is initiated via the cam 13 or a plunger.
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
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10194642T DE10194642D2 (de) | 2000-11-14 | 2001-10-22 | Mechanisches Ventilspielausgleichselement für einen Ventiltrieb an einer Kolbenbrennkraftmaschine |
JP2002543130A JP2004514084A (ja) | 2000-11-14 | 2001-10-22 | 内燃ピストン機関の弁駆動用の機械的弁間隙補償要素 |
US10/181,222 US6834628B2 (en) | 2000-11-14 | 2001-10-22 | Mechanical valve play compensation element for a valve drive on a piston combustion engine |
US11/002,310 US7146953B2 (en) | 2000-11-14 | 2004-12-03 | Mechanical valve play compensation element for a valve drive on a piston combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10056423A DE10056423A1 (de) | 2000-11-14 | 2000-11-14 | Mechanisches Ventilspielausgleichselement für einen Ventiltrieb an einer Kolbenbrennkraftmaschine |
DE10056423.2 | 2000-11-14 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/002,310 Continuation US7146953B2 (en) | 2000-11-14 | 2004-12-03 | Mechanical valve play compensation element for a valve drive on a piston combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002040833A1 true WO2002040833A1 (de) | 2002-05-23 |
Family
ID=7663277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/012157 WO2002040833A1 (de) | 2000-11-14 | 2001-10-22 | Mechanisches ventilspielausgleichselement für einen ventiltrieb an einer kolbenbrennkraftmaschine |
Country Status (4)
Country | Link |
---|---|
US (2) | US6834628B2 (de) |
JP (1) | JP2004514084A (de) |
DE (2) | DE10056423A1 (de) |
WO (1) | WO2002040833A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10056423A1 (de) * | 2000-11-14 | 2002-05-29 | Fev Motorentech Gmbh | Mechanisches Ventilspielausgleichselement für einen Ventiltrieb an einer Kolbenbrennkraftmaschine |
KR101264641B1 (ko) * | 2006-12-28 | 2013-05-24 | 니탄 밸브 가부시키가이샤 | 기계식 어저스터 |
DE102007045194B3 (de) * | 2007-09-21 | 2009-02-19 | Mtu Friedrichshafen Gmbh | Verfahren zur Steuerung einer Brennkraftmaschine |
DE112009000693T5 (de) * | 2008-03-24 | 2011-03-24 | NTN Corporation, Osaka-shi | Spielausgleichsvorrichtung |
WO2017216946A1 (ja) | 2016-06-17 | 2017-12-21 | 日鍛バルブ株式会社 | 機械式ラッシュアジャスタ |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1445118A (en) * | 1921-01-17 | 1923-02-13 | Charles B Ware | Automatic valve-rod-adjusting device |
US1757721A (en) * | 1928-09-10 | 1930-05-06 | Jr Emil R Klemm | Tappet |
GB805729A (en) * | 1956-05-28 | 1958-12-10 | Gen Motors Corp | Improvements in or relating to valve gears for internal combustion engines |
US2933074A (en) * | 1953-09-21 | 1960-04-19 | B C Skinner | Length compensating device |
FR2209396A5 (de) * | 1972-12-04 | 1974-06-28 | Ustav Pro Vyzkum Motorovych Vo | |
EP0032284A1 (de) | 1980-01-12 | 1981-07-22 | Gkn Technology Limited | Nachstellbarer Ventilstössel mit Schraube |
DE3607170A1 (de) | 1986-03-05 | 1987-09-10 | Volkswagen Ag | Mechanischer ventilspielausgleich |
WO1990010787A1 (en) | 1989-03-10 | 1990-09-20 | Gkn Technology Limited | Automatic length adjuster |
JPH0861020A (ja) * | 1994-08-11 | 1996-03-05 | Akira Sakamoto | バルブクリアランスの自動調整構造 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2308858A (en) * | 1940-03-04 | 1943-01-19 | Thompson Prod Inc | Hydromechanical clearance regulator |
US3805753A (en) * | 1972-02-24 | 1974-04-23 | Johnson Products Inc | Hydraulic lash adjuster for overhead cam engines |
US4200081A (en) * | 1975-12-15 | 1980-04-29 | Eaton Corporation | Valve selector |
DE3101305A1 (de) * | 1980-01-28 | 1981-11-19 | Aisin Seiki K.K., Kariya, Aichi | Hydraulische stuetzvorrichtung fuer ein hebellager eines ventilantriebs einer brennkraftmaschine |
JPH0717765Y2 (ja) * | 1988-10-29 | 1995-04-26 | 富士重工業株式会社 | 油圧式ハイドロリックラッシュアジャスタ装置 |
US5570665A (en) * | 1995-04-04 | 1996-11-05 | Chrysler Corporation | Valve train for internal combustion engine |
WO2001020150A1 (en) * | 1999-09-17 | 2001-03-22 | Diesel Engine Retarders, Inc. | Captive volume accumulator for a lost motion system |
DE10056423A1 (de) * | 2000-11-14 | 2002-05-29 | Fev Motorentech Gmbh | Mechanisches Ventilspielausgleichselement für einen Ventiltrieb an einer Kolbenbrennkraftmaschine |
-
2000
- 2000-11-14 DE DE10056423A patent/DE10056423A1/de not_active Withdrawn
-
2001
- 2001-10-22 DE DE10194642T patent/DE10194642D2/de not_active Expired - Fee Related
- 2001-10-22 US US10/181,222 patent/US6834628B2/en not_active Expired - Fee Related
- 2001-10-22 WO PCT/EP2001/012157 patent/WO2002040833A1/de active Application Filing
- 2001-10-22 JP JP2002543130A patent/JP2004514084A/ja not_active Withdrawn
-
2004
- 2004-12-03 US US11/002,310 patent/US7146953B2/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1445118A (en) * | 1921-01-17 | 1923-02-13 | Charles B Ware | Automatic valve-rod-adjusting device |
US1757721A (en) * | 1928-09-10 | 1930-05-06 | Jr Emil R Klemm | Tappet |
US2933074A (en) * | 1953-09-21 | 1960-04-19 | B C Skinner | Length compensating device |
GB805729A (en) * | 1956-05-28 | 1958-12-10 | Gen Motors Corp | Improvements in or relating to valve gears for internal combustion engines |
FR2209396A5 (de) * | 1972-12-04 | 1974-06-28 | Ustav Pro Vyzkum Motorovych Vo | |
EP0032284A1 (de) | 1980-01-12 | 1981-07-22 | Gkn Technology Limited | Nachstellbarer Ventilstössel mit Schraube |
DE3607170A1 (de) | 1986-03-05 | 1987-09-10 | Volkswagen Ag | Mechanischer ventilspielausgleich |
WO1990010787A1 (en) | 1989-03-10 | 1990-09-20 | Gkn Technology Limited | Automatic length adjuster |
JPH0861020A (ja) * | 1994-08-11 | 1996-03-05 | Akira Sakamoto | バルブクリアランスの自動調整構造 |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 07 31 July 1996 (1996-07-31) * |
Also Published As
Publication number | Publication date |
---|---|
US20050092277A1 (en) | 2005-05-05 |
JP2004514084A (ja) | 2004-05-13 |
US7146953B2 (en) | 2006-12-12 |
US20030089324A1 (en) | 2003-05-15 |
DE10056423A1 (de) | 2002-05-29 |
DE10194642D2 (de) | 2003-07-03 |
US6834628B2 (en) | 2004-12-28 |
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