EP1421261A1 - Valve mechanism with a variable valve opening cross-section - Google Patents
Valve mechanism with a variable valve opening cross-sectionInfo
- Publication number
- EP1421261A1 EP1421261A1 EP02732390A EP02732390A EP1421261A1 EP 1421261 A1 EP1421261 A1 EP 1421261A1 EP 02732390 A EP02732390 A EP 02732390A EP 02732390 A EP02732390 A EP 02732390A EP 1421261 A1 EP1421261 A1 EP 1421261A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- valve mechanism
- mechanism according
- gas exchange
- slide
- 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.)
- Withdrawn
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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
-
- 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
-
- 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
- F01L1/28—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of coaxial valves; characterised by the provision of valves co-operating with both intake and exhaust ports
-
- 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
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
- F01L1/462—Valve return spring arrangements
-
- 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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/06—Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
-
- 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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
- F01L3/085—Valve cages
-
- 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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/10—Connecting springs to valve members
-
- 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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the electrohydraulic valve control comprises a hydraulically actuated control valve, the control valve piston of which actuates a valve body of the intake and exhaust valves and leads against a valve seat (valve seat ring) (closing the valve) or moves it away (opening the valve).
- the control valve can be actuated by pressure control of a hydraulic medium. The pressure is controlled via solenoid valves integrated in the hydraulic circuit. In order to achieve the best possible gas exchange, the highest possible switching speeds of the control valve are desirable. Due to these high switching speeds, the valve body of the intake and exhaust valves hits the valve seat ring at high speed. This results in noise on the one hand and the valve partners are subject to relatively high wear.
- EP 0 455 761 B1 relates to a hydraulic valve control device for an internal combustion engine.
- the basic technical principle of this solution is to move an engine valve by means of a controlled pressure of a hydraulic fluid.
- an electronic control device controls a solenoid valve, which in turn controls the movement of a storage piston, via which the stroke of the engine valve is changed.
- a disadvantage of these known solutions for valve control is, in particular, the high outlay in the manufacture and assembly of the valve mechanism due to its complicated structure. This has a negative impact on the costs of production and assembly. Furthermore, extremely high speeds and large forces are required for valve control in these solutions, so that an increased susceptibility to failure of the valve control due to heavy wear of the parts of the valve mechanism is the inevitable result.
- valve mechanism with the characterizing features of the main claim, on the other hand, offers the advantage of creating a variable valve opening cross section with simple means.
- a Diclt slide is arranged coaxially to the gas exchange valve, which is acted upon by the force of a coupling spring and can be moved back and forth by the valve control in the axial direction, the position of the seal slide relative to the gas exchange valve being changeable in the axial direction by an adjusting unit , which essentially consists of a control slide adjustable in the axial direction of the gas exchange valve, each of which is coaxial with the gas exchange valve and the sealing slide is arranged, a valve mechanism is created which has a simple structure and functions safely and permanently.
- valve disk has a conical shape Has circumferential surface that forms the sealing seat of the gas exchange valve.
- the sealing slide consists of a bush-shaped bearing body, which is arranged so as to be axially displaceable back and forth within a guide of the cylinder head.
- the supply of air to the 0 'internal combustion engine are achieved or the air-fuel mixture controlled with a high accuracy and thus a high efficiency.
- control slide is connected via an external thread to a corresponding internal thread of a gear wheel surrounding it, which is connected to a toothed rack by means of which a longitudinal movement can be carried out.
- FIG. 1 is a side view of the valve mechanism according to the invention with a camshaft
- FIG. 2 shows a plan view of the valve mechanism according to the invention and the camshaft according to FIG. 1;
- Figure 3 shows a section A-A of Figure 2 through a cylinder head with the valve mechanism according to the invention and with a camshaft, which is a first embodiment of the invention
- Figure 4 shows a detail X of Figure 3
- Cylinder head with the valve mechanism according to the invention and without the camshaft which is a first exemplary embodiment of the invention
- Figure 6 shows a section C-C of Figure 5
- Figure 7 shows a section D-D of Figure 5
- FIG 8 a detail Y according to Figure 5;
- FIG. 9 shows a perspective view of a control slide of the valve mechanism according to the invention according to a first exemplary embodiment of the invention.
- FIG. 10 shows a section AA according to FIG. 2 through a cylinder head with the valve mechanism according to the invention and with a camshaft, which is a second embodiment of the invention
- FIG. 11 shows a detail X according to FIG. 10
- FIG. 12 shows a section B-B according to FIG. 1 through a cylinder head with the valve mechanism according to the invention and without the camshaft, which is a second exemplary embodiment of the invention
- Figure 13 shows a section C-C of Figure 12
- Figure 15 is a perspective view of a sealing slide! 0 of the valve mechanism according to the invention.
- FIGS. 1 and 2 show the valve mechanism according to the invention with a camshaft 44 as a valve control unit in its arrangement on the cylinder head 18 of an internal combustion engine, each in a side view and a top view. According to FIG. 2, two cams are arranged on the camshaft 44, each of which controls the axial displacement movement of a gas exchange valve 12.
- FIG. 3 shows the valve mechanism according to the invention with its essential components in a sectional view, which is a first embodiment of the invention.
- the valve mechanism includes a cylinder valve 12 which acted upon by the force of a valve spring 16 is.
- the gas exchange valve 12 can be displaced axially back and forth within a guide, the displacement movement being generated by a valve control unit.
- a camshaft 44 is provided as the valve control unit.
- the gas exchange valve 12 has a rotationally symmetrical basic structure and consists of a valve stem 14, at the lower end of which a valve disk 20 is arranged.
- FIG. 3 shows the valve mechanism in the closed position of the gas exchange valve 12.
- the sealing seat 28 of the gas exchange valve 12 is in each case in direct contact with a sealing seat 30 of the sealing slide 10 and with a valve seat ring 22 of the cylinder head 18.
- the structure and mode of operation of gas exchange valves 12 per se are generally known, so that this will not be discussed in more detail in the context of the present description.
- the invention provides that a sealing slide 10 is arranged coaxially with the gas exchange valve 12.
- the sealing slide 10 is acted upon by the force of a coupling spring 24 and can be displaced axially back and forth.
- the displacement movement of the sealing slide 10 is also generated by the camshaft 40, by which the displacement movement of the gas exchange valve 12 is controlled.
- a stop disk 26 is fastened to the bearing body 40 near its upper end. To facilitate the rotation
- this stop disc 26 consists of two
- the two parts of the stop disk 26 are surrounded by a clamping ring 36, by which they are held together.
- connection between the sealing body 38 and the bearing body 40 is designed such that sufficient space remains for the air flowing through or for the air-fuel mixture. Both for the inlet and for the outlet of air or the air-fuel mixture is therefore advantageously within the sealing slide 10, a sufficiently large passage opening for ungehin- ⁇ derten flowing through said medium exists ..
- FIG. 8 shows a detail Y according to FIG. 5. It can be clearly seen in this illustration that a control slide 34 is arranged coaxially with the gas exchange valve 12 and with the sealing slide 10.
- the control slide valve 34 (FIG. 9) is provided with an external thread 46, by means of which it is connected to a corresponding internal thread 48 of a toothed wheel 50 surrounding it.
- a locking washer 58 is arranged above the gearwheel 50, by means of which the position of the control slide 34 can be adjusted.
- FIG. 7 shows in a sectional representation D-D according to FIG. 5 the engagement of the toothing 56 of the toothed rack 52 in the toothing 54 of the toothed wheel 50.
- FIG.0 shows a detail X of Figure 3 shows a preferred embodiment of the invention, with which a rotationally fixed connection of the locking washer 58 can be made with the housing of the cylinder head 18.
- FIG. 12 shows the arrangement of a toothed rack 58 on the valve mechanism, which is connected to the toothed wheel 50.
- the rack 58 is displaceable in its longitudinal direction and is in engagement with the toothing 54 of the toothed wheel 50 via its toothing 56.
- FIG. 13 shows, in a sectional illustration according to FIG. 5, the engagement of the toothing 60 of the gearwheel 50 in the toothing 62 of the rack 58.
- valve control unit which in a preferred embodiment of the invention is a camshaft 44, the gas exchange valve 12 can either be opened or
- the camshaft 4 " 4 works against the restoring force
- valve spring 16 which is on the cylinder head 18 and on the valve plate 20, which is with the gas exchange valve
- the sealing slide 10 is moved along via the coupling spring 24, which is under a certain pretension.
- the coupling spring 24 is supported on the valve plate 20 and on the stop disk 26, which is connected to the sealing slide 10.
- the sealing seat 30 of the sealing slide 10 is pressed onto the sealing seat 28 of the gas exchange valve 12. Since there is an annular gap seal between the sealing body 38 and the valve seat ring 22, only a very small amount of air (leakage) can get into the combustion chamber 32.
- the regulating slide 34 is adjustable in the axial direction of the valve stem 14 in its starting position relative to the gas exchange valve 12.
- the control slide 34 can only be adjusted via a corresponding adjustment unit, two preferred embodiments of which are shown in detail in FIGS. 4 to 9 and 11 to 14. Otherwise, the position of the control slide 34 remains fixed within the valve mechanism, even if external forces act on it.
- the adjusting units can each be actuated electrically, hydraulically or pneumatically.
- the sealing slide 10 can no longer move in the opening direction 'of the gas exchange valve 12. Since the gas exchange valve 12 is moved further by the camshaft, the sealing seat 28 of the gas exchange valve 12 lifts off from the sealing seat 30 of the sealing slide 10, air being able to penetrate into the combustion chamber 32.
- the coupling spring 24 is compressed.
- the gas exchange valve 12 follows the closing flank of the camshaft 40, it is pressed in the closing direction by the valve spring 16. , '' The 'sealing seat 28 of the gas exchange valve 12 lies against the sealing seat 30 of the sealing slide 10. The sealing slide 10 is carried along until the sealing seat 28 of the gas exchange valve 12 bears against the valve seat ring 22 and the gas exchange valve 12 is closed.
- control slide 34 By axially shifting the position of the control slide 34 via an adjusting unit, it can be set when the sealing seat 28 of the gas exchange valve 12 lifts off from the sealing seat 30 of the sealing slide 10. In this advantageous manner, the opening cross section of the gas exchange valve 12 and thus also the amount of air entering the combustion chamber 32 can be regulated.
- the control slide valve 34 shown in FIG. 9 has an external thread 46 with a certain pitch.
- the internal thread 48 of the gearwheel 50 engages in the external thread 46 of the regulating slide 34.
- a groove 62 is incorporated into the control slide 34, into which the web 60 of the locking washer 58 engages. If the locking washer 58 is connected to the housing of the cylinder head 18 in a rotationally fixed manner, a rotary movement of the gearwheel 50 is converted via the thread 48 into a displacement movement of the control slide 34 in the axial direction.
- the rotational movement of the gear 48 is generated with the aid of a longitudinal movement of the rack 52.
- the longitudinal movement of the toothed rack 52 can take place, for example, via a hydraulic or pneumatic cylinder, or via an electric motor which drives a toothed wheel 50 which engages in the toothing 56 of the toothed rack 52.
- the invention advantageously makes it possible to regulate the opening cross section of a plurality of gas exchange valves 12 with a rack 58.
- the locking disk 58 can be rotated, the rack 52 being prevented from moving at the same time.
- the gearwheel 50 will also perform a rotational movement due to the friction of the internal thread 48, namely until the toothing 54 of the gearwheel 50 bears against the toothing 56 of the rack 52.
- the lock washer 58 continues to rotate, the control slide 34 performs a stroke movement tion in the axial direction, since the rack 52 is prevented from longitudinal movement and thus the gear 50 is prevented from rotating. The rotary movement of the locking washer 58 continues until the control slide 34 has assumed the position to be set.
- a rotationally fixed connection between the locking washer and the housing 58 of the cylinder head '18 is prepared.
- the rotationally fixed connection is achieved by means of the embossing of knobs 64 on the locking washer 58, which protrude into bores 66 made in the housing of the cylinder head 18.
- valve mechanism! 0 The basic operation of the valve mechanism! 0 is analogous to the operation of the valve mechanism described in the first embodiment. There are differences in certain details, which are described in the further explanations.
- the control slide 34 of the adjustment unit shown in FIG. 14 has an external thread 46 with a certain pitch.
- the internal thread 48 of the gear wheel 50 engages in the external thread 46 of the regulating slide 34.
- the opening cross section of the gas exchange valve 12 can be regulated in an advantageous manner by the longitudinal movement of the rack 58.
- the longitudinal movement of the rack 58 can preferably take place via a hydraulic or pneumatic cylinder, or via an electric motor that drives a gear wheel 50 which engages in the toothing 62 of the rack 58.
- the invention advantageously makes it possible to regulate the opening cross section of a plurality of gas exchange valves 12 with only one rack 58. This makes the solution according to the invention particularly cost-effective. 0
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10140952A DE10140952A1 (en) | 2001-08-21 | 2001-08-21 | Valve mechanism with a variable valve opening cross section |
DE10140952 | 2001-08-21 | ||
PCT/DE2002/001364 WO2003018966A1 (en) | 2001-08-21 | 2002-04-12 | Valve mechanism with a variable valve opening cross-section |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1421261A1 true EP1421261A1 (en) | 2004-05-26 |
Family
ID=7696129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02732390A Withdrawn EP1421261A1 (en) | 2001-08-21 | 2002-04-12 | Valve mechanism with a variable valve opening cross-section |
Country Status (6)
Country | Link |
---|---|
US (1) | US6766778B2 (en) |
EP (1) | EP1421261A1 (en) |
JP (1) | JP2005500461A (en) |
KR (1) | KR100826465B1 (en) |
DE (1) | DE10140952A1 (en) |
WO (1) | WO2003018966A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10140919A1 (en) * | 2001-08-21 | 2003-03-20 | Bosch Gmbh Robert | Valve mechanism with a variable valve opening cross section |
FR2853011B1 (en) * | 2003-03-26 | 2006-08-04 | Melchior Jean F | ALTERNATIVE ENGINE FOR RECIRCULATING BURNED GASES FOR PROPULSION OF MOTOR VEHICLES AND METHOD OF TURBOCOMPRESSING THE SAME |
DE102005050777A1 (en) * | 2005-10-24 | 2007-04-26 | Robert Bosch Gmbh | Cylinder head for an internal combustion engine |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US477915A (en) | 1892-06-28 | Island | ||
DE2612430A1 (en) * | 1976-03-24 | 1977-10-06 | Daimler Benz Ag | Supplementary mixture:inflow control device for IC engines - using an electromagnetically operated sleeve to shorten inflow period |
DE2636519A1 (en) * | 1976-08-13 | 1978-02-16 | Daimler Benz Ag | IC engine inlet valve with back-up valve for charge variation - has hydraulic advance and spring retraction by operating units in port wall |
DE3939065A1 (en) | 1989-11-25 | 1991-05-29 | Bosch Gmbh Robert | HYDRAULIC VALVE CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINES |
US5253621A (en) * | 1992-08-14 | 1993-10-19 | Group Lotus Plc | Valve control means |
GB2248471A (en) * | 1990-10-04 | 1992-04-08 | Ford Motor Co | I.c.engine poppet valve guide and variable throttle |
US5159906A (en) | 1991-05-03 | 1992-11-03 | Ford Motor Company | Adjustable valve system for an internal combustion engine |
JPH08189319A (en) * | 1994-12-28 | 1996-07-23 | Aisin Seiki Co Ltd | Valve system for engine |
DE19712668C1 (en) * | 1997-03-26 | 1998-05-07 | Daimler Benz Ag | Actuator for valves of internal combustion engine |
-
2001
- 2001-08-21 DE DE10140952A patent/DE10140952A1/en not_active Ceased
-
2002
- 2002-04-12 WO PCT/DE2002/001364 patent/WO2003018966A1/en active Application Filing
- 2002-04-12 US US10/399,662 patent/US6766778B2/en not_active Expired - Fee Related
- 2002-04-12 KR KR1020047002507A patent/KR100826465B1/en not_active IP Right Cessation
- 2002-04-12 JP JP2003523801A patent/JP2005500461A/en active Pending
- 2002-04-12 EP EP02732390A patent/EP1421261A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO03018966A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10140952A1 (en) | 2003-03-20 |
KR100826465B1 (en) | 2008-05-02 |
US6766778B2 (en) | 2004-07-27 |
WO2003018966A1 (en) | 2003-03-06 |
KR20040030158A (en) | 2004-04-08 |
JP2005500461A (en) | 2005-01-06 |
US20040025820A1 (en) | 2004-02-12 |
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