WO2006042346A1 - Brennkraftmaschine - Google Patents
Brennkraftmaschine Download PDFInfo
- Publication number
- WO2006042346A1 WO2006042346A1 PCT/AT2005/000396 AT2005000396W WO2006042346A1 WO 2006042346 A1 WO2006042346 A1 WO 2006042346A1 AT 2005000396 W AT2005000396 W AT 2005000396W WO 2006042346 A1 WO2006042346 A1 WO 2006042346A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- internal combustion
- combustion engine
- exhaust
- engine 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
Definitions
- the invention relates to an internal combustion engine with an exhaust gas engine brake, with at least one exhaust valve per cylinder, with a limiting device for limiting the Auslandventilschpracticieri during the Motorbremsbe ⁇ drive.
- Engine brakes with a throttle device in the exhaust system are known and represent a retarder, wherein the throttle device is usually formed by an exhaust tailgate.
- engine brakes which are based exclusively on the throttling effect of exhaust stoppers, have the disadvantage of relatively low engine braking power.
- engine brakes which have a device which keep the exhaust valve a small gap open during the compression stroke.
- the Aus ⁇ let valve is opened again after the exhaust stroke. This ensures that the air is not compressed, but passes through the gap of the exhaust valve, which acts as a throttle in the exhaust.
- the energy is converted into heat at the throttle gap and passes partly into the exhaust pipe, and partly into the cooling water of the internal combustion engine.
- the internal combustion engine can not be overcooled even during prolonged descent.
- the braking power of such systems is about twice that of conventional exhaust brakes.
- Motor brakes of this type have been manufactured by MACK TRUCKS INC. and JACOBS MANUFACTURING COMPANY verwirk ⁇ light.
- EP 0 736 672 A2 discloses a method for engine braking of the type mentioned in the introduction, in which the outlet valve is blocked during intermediate opening movements and closing is prevented.
- the insects are caused by a pressure increase in the exhaust line, wel ⁇ cher is caused by a throttle device. It is exploited that in internal combustion engines with a switchable throttle device in the exhaust puff to high-frequency pressure pulsations in the exhaust pipe upstream of the throttle device comes in engine braking mode.
- the throttle device is activated, the exhaust gas pressure in the region of the bottom dead center after the intake stroke increases so sharply that the outlet valve is pressed open by the pressure wave of an adjacent cylinder.
- a four-stroke internal combustion engine for driving a motor vehicle with an exhaust engine brake is known, is limited in the brake operation by a limiting device, the stroke of the exhaust valves to a closing of the exhaust valves preventing measure. Due to the resulting throttle gap, the gas is throttled during the compression and expansion stroke and the engine braking performance in combination with a conventional engine exhaust brake with an exhaust gas flap is improved.
- the limiting device consists essentially of a hydraulic piston which can be acted upon by pressurized oil and which is arranged in the same axis as the outlet valve and acts on the rear side of the outlet valve lever. However, the force applied by the limiting device has to be greater than the spring force of the outlet valve spring in order to adequately brake the outlet valve and to keep a predefined gap open.
- EP 0 736 672 B1 discloses a method for engine braking with a four-stroke internal combustion engine, in which a hydraulic element follows the exhaust valve lifted off when an exhaust flap brake is actuated and blocks it, so that a gap is formed between exhaust valve and exhaust valve seat , The extended hydraulic element is supported by a fixed stop. Opening the exhaust valve to the full stroke releases the hydraulic lock.
- the fixed stop must be adjusted in addition to the valve game. Disadvantage of this method is that the internal combustion engine must be changed greatly in its valvetrain components and an additional exhaust flap is necessary.
- an internal combustion engine with an exhaust engine brake which has a limiting device for limiting the outlet valve closing movement during engine braking operation.
- the limiting device has a delimiting part, which is displaceable transversely to the direction of movement of the outlet valve in a housing between a blocking position and a position of rest, which acts on the valve stem of the outlet valve in the blocking position in the direction of the opening stroke.
- the object of the invention is to avoid the disadvantages mentioned and to reduce wear and noise in the aforementioned internal combustion engine.
- a play occurring in the valve drive train during engine braking operation can be bridged by means of a hydraulic damping device.
- the damping device is arranged in the valve drive train between the limiting device and the camshaft. It can be provided that the damping device is arranged in or on a rocker arm. Alternatively, it is possible that the damping device is integrated in a plunger.
- the arranged in the valve drive train damping device bridges the gap occurring in engine braking operation and prevents that at the beginning of the cam-related Auslasshubvorganges by the gap spaced parts in the Auslassventilstrang.
- the damping device a bumpless opening of the exhaust valve is made possible.
- the Dämpfungsein ⁇ direction comprises a piston guided in a cylinder, wherein cylinder and piston span a space, which via a flow connection, preferred wise non-return valve, is connected to an oil room.
- no check valve is provided in the oil supply channel.
- the piston and cylinder are pushed apart by a spring, whereby the piston and cylinder forming space is filled with oil.
- the opening movement resulting from the exhaust valve cam moves the piston to reduce the gap in the cylinder, forcing the oil out of the space, thereby dampening the relative movement of the parts adjacent the damping element in the exhaust valve drive train.
- the damping effect of the Dämpfungseinrich ⁇ device is defined by the cross section of the flow connection or by a throttle point in the flow connection.
- the damping device is combined with a valve lash adjuster. In this way, components and space can be saved.
- the Begrenzseinrich ⁇ device has a transversely to the direction of movement of the exhaust valve in a housing between a blocking position and a rest position sliding slider, which in the blocking position in the direction of the opening stroke on the valve stem of the exhaust valve, preferably via a rocker arm or a valve bridge, acts and blocks the closing movement of the exhaust valve.
- the limiting device it is possible for the limiting device to have a rotatably mounted eccentric, which can be rotated between a blocking position and a rest position, and which acts on the valve stem of the outlet valve in the blocking position in the direction of the opening stroke and the latter Closing movement blocked.
- an exhaust gas flap is arranged in the exhaust system.
- FIG. 1 shows the exhaust valve drive train of a combustion engine according to the invention in a first embodiment variant with a limiting device in the deactivated state
- FIG. 3 shows this exhaust valve drive train during the engine braking operation
- FIG. 4 shows an exhaust valve drive train of a combustion engine according to the invention in a second embodiment variant with a limiting device in the deactivated state
- a part of a valve drive train 2 for an outlet valve 4 indicated by the valve stem is shown in different operating positions.
- a push rod 6 actuated by an exhaust cam acts on the exhaust valve stem of the exhaust valve 4 via a rocker arm 8.
- the rocker arm 8 is prevented by a restriction device 10 after an exhaust valve stroke from returning to its rest position corresponding to the closed position of the exhaust valve 4.
- the limiting device 10 has a slide 12 which forms a stop for the rocker arm 8 and which is displaceably mounted in a housing 14. At the slider 12 facing upper side of the rocker arm 8 a Anschlag ⁇ surface 16 is provided.
- the slider 12 In the deactivated state, the slider 12 is held by a first spring 18 in the rest position shown in Fig. 1. If the limiting device 10 is activated, the slide 12 becomes pressurized in the pressure chamber in fluid communication with a pressure source 20 and supported by the second spring 22 against the force of the first spring 18 in the in Fig. 2 shown activation position, when the exhaust valve 4 is in its open position shown in Fig. 2, and thus the exhaust valve 4 prevented from closing, as shown in Fig. 3. After the end of the Auslassö Stammshubes the exhaust valve 4 is still open by the gap s. The gap s is - depending on the size of the exhaust valve - between about 1 mm to 2 mm.
- FIGS. 4 to 6 show analogous operating positions to FIGS. 1 to 3, in which case the limiting device 10 is provided by means of a WeIIe 26 rotatable eccentric 28 is formed.
- the eccentric 28 is shown in the deactivated state, in the activated state in FIGS. 5 and 6.
- the damping device 32 in this case has a displaceable piston 34 in a cylinder 36, wherein between the piston 36 and the cylinder 34, a space 38 is clamped, which communicates via a flow path 40 with an oil space formed by an oil passage 42 within the Kipphebelachse 53 , A spring 44 and the engine oil pressure in the chamber 38 push the piston 36 out of the cylinder 34 of the damping element 32 into the socket 46 of the push rod 6, so that the valve clearance 30 is bridged by the damping device 32.
- the damping element 32 between the Kipp ⁇ lever 8 and the push rod 6 is arranged.
- This has the advantage that it can also be installed with little modification effort in already existing engines, since the rocker arm bearing either already a ⁇ lversor ⁇ supply anyway needed or the oil supply can be done by the hollow push rod 6.
- the damping element 32 may be combined with a valve lash adjuster 52 formed by a valve adjusting screw.
- the damping element 32 can thus be exchanged with a valve adjusting device 52 against a conventional adjusting screw. If necessary, use a shortened push rod 6.
- the damping element 32 can also be arranged at the other end of the push rod 6, for example, it can be installed in the push rod itself. For this purpose, however, an oil supply of the plunger would be necessary.
- the illustrated embodiments show the engine brake of an engine with an exhaust valve 4.
- the same principle can be applied to internal combustion engines with two exhaust valves.
- the limiting device 10 acts on a valve bridge actuating the two exhaust valves.
- the Ab ⁇ support takes place only on one, an outlet valve associated end. Thus, only one outlet valve is kept open, while with a slight inclination of the valve bridge, the other outlet valve assumes its closed position in a conventional manner.
- an exhaust gas flow flap can additionally be arranged in the exhaust gas line.
- the limiting device 10 can be actuated completely independently of the position of the camshaft.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112005002543.8T DE112005002543B4 (de) | 2004-10-18 | 2005-10-06 | Brennkraftmaschine und ein Verfahren zum Betreiben einer Brennkraftmaschine |
CN2005800354217A CN101040103B (zh) | 2004-10-18 | 2005-10-06 | 内燃机 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0174504A AT500958B1 (de) | 2004-10-18 | 2004-10-18 | Brennkraftmaschine mit einer abgas-motorbremse |
ATA1745/2004 | 2004-10-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006042346A1 true WO2006042346A1 (de) | 2006-04-27 |
Family
ID=35636808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2005/000396 WO2006042346A1 (de) | 2004-10-18 | 2005-10-06 | Brennkraftmaschine |
Country Status (4)
Country | Link |
---|---|
CN (1) | CN101040103B (de) |
AT (1) | AT500958B1 (de) |
DE (1) | DE112005002543B4 (de) |
WO (1) | WO2006042346A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2055906A1 (de) * | 2007-10-31 | 2009-05-06 | Caterpillar Motoren GmbH & Co. KG | Vorrichtung und Verfahren zur Ventilsteuerung |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1812787A (en) * | 1929-06-05 | 1931-06-30 | Ora M Doolittle | Braking attachment for vehicle motors |
US4856474A (en) * | 1987-04-09 | 1989-08-15 | Ina Walzlager Schaeffler Kg | Valve control device |
DE4007287A1 (de) * | 1990-03-08 | 1991-09-12 | Man Nutzfahrzeuge Ag | Motorbremse fuer luftverdichtende brennkraftmaschine |
DE10116143A1 (de) * | 2001-03-30 | 2002-10-10 | Man Nutzfahrzeuge Ag | Motorbremse |
DE10134890A1 (de) * | 2001-07-18 | 2003-02-06 | Daimler Chrysler Ag | Ventilsteuerung für in einem Bremsmodus zu betreibende Brennkraftmaschinen |
JP2004084630A (ja) * | 2002-08-28 | 2004-03-18 | Nippon Piston Ring Co Ltd | 動弁装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4473047A (en) * | 1980-02-25 | 1984-09-25 | The Jacobs Mfg. Company | Compression release engine brake |
DE3428627A1 (de) * | 1984-08-03 | 1986-02-13 | Daimler-Benz Ag, 7000 Stuttgart | Viertakt-brennkraftmaschine |
US5086783A (en) * | 1990-10-31 | 1992-02-11 | Sherwood Medical Company | Blood sampling device |
SE470363B (sv) * | 1992-06-17 | 1994-01-31 | Volvo Ab | Förfarande och anordning för motorbromsning med en flercylindrig förbränningsmotor |
ATE164918T1 (de) * | 1995-04-04 | 1998-04-15 | Steyr Nutzfahrzeuge | Verfahren zur motorbremsung mit einem 4-takt- verbrennungsmotor |
AT2904U1 (de) * | 1998-08-20 | 1999-06-25 | Avl List Gmbh | Brennkraftmaschine mit einer abgas-motorbremse |
-
2004
- 2004-10-18 AT AT0174504A patent/AT500958B1/de not_active IP Right Cessation
-
2005
- 2005-10-06 DE DE112005002543.8T patent/DE112005002543B4/de not_active Expired - Fee Related
- 2005-10-06 WO PCT/AT2005/000396 patent/WO2006042346A1/de active Application Filing
- 2005-10-06 CN CN2005800354217A patent/CN101040103B/zh not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1812787A (en) * | 1929-06-05 | 1931-06-30 | Ora M Doolittle | Braking attachment for vehicle motors |
US4856474A (en) * | 1987-04-09 | 1989-08-15 | Ina Walzlager Schaeffler Kg | Valve control device |
DE4007287A1 (de) * | 1990-03-08 | 1991-09-12 | Man Nutzfahrzeuge Ag | Motorbremse fuer luftverdichtende brennkraftmaschine |
DE10116143A1 (de) * | 2001-03-30 | 2002-10-10 | Man Nutzfahrzeuge Ag | Motorbremse |
DE10134890A1 (de) * | 2001-07-18 | 2003-02-06 | Daimler Chrysler Ag | Ventilsteuerung für in einem Bremsmodus zu betreibende Brennkraftmaschinen |
JP2004084630A (ja) * | 2002-08-28 | 2004-03-18 | Nippon Piston Ring Co Ltd | 動弁装置 |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05) * |
Also Published As
Publication number | Publication date |
---|---|
AT500958B1 (de) | 2006-10-15 |
CN101040103A (zh) | 2007-09-19 |
AT500958A1 (de) | 2006-05-15 |
DE112005002543B4 (de) | 2018-01-18 |
DE112005002543A5 (de) | 2007-09-06 |
CN101040103B (zh) | 2010-05-05 |
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