EP3502436A1 - Connecting rod for a combustion engine with variable compression with a switching valve - Google Patents
Connecting rod for a combustion engine with variable compression with a switching valve Download PDFInfo
- Publication number
- EP3502436A1 EP3502436A1 EP19150637.7A EP19150637A EP3502436A1 EP 3502436 A1 EP3502436 A1 EP 3502436A1 EP 19150637 A EP19150637 A EP 19150637A EP 3502436 A1 EP3502436 A1 EP 3502436A1
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- EP
- European Patent Office
- Prior art keywords
- connecting rod
- valve
- switching valve
- valve housing
- locking pin
- 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
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- 230000006835 compression Effects 0.000 title claims abstract description 16
- 238000007906 compression Methods 0.000 title claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 description 9
- 238000010079 rubber tapping Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
Definitions
- the invention relates to a connecting rod with a switching valve for controlling a hydraulic fluid flow.
- a high compression ratio has a positive effect on the efficiency of the internal combustion engine.
- compression ratio is generally understood the ratio of the entire cylinder space before compression to the remaining cylinder space after compression.
- the compression ratio may only be selected so high that a so-called "knocking" of the internal combustion engine is avoided during full load operation.
- the compression ratio could be selected with higher values without "knocking" occurring.
- the important part load range of an internal combustion engine can be improved if the compression ratio is variably adjustable.
- systems with variable connecting rod length known which operate by means of hydraulically or mechanically actuated changeover valves an eccentric adjustment of a connecting rod.
- a generic connecting rod is for example from the DE 10 2012 112 461 A1 refer to.
- a tapping element of the switching element described therein can be locked by means of a detent ball and a spring in two switching positions, wherein the detent ball cooperates with two locking grooves formed in the tapping element.
- the structure of the known switching valve is considered to be expensive and therefore expensive.
- An object of the invention is to provide a connecting rod with an improved changeover valve.
- a connecting rod for an internal combustion engine with variable compression is proposed, with an eccentric adjusting device in the connecting rod cover for adjusting an effective connecting rod length.
- An adjustment of the eccentric adjusting device is adjustable by means of a switching valve.
- a valve housing of the changeover valve is provided secured by means of one or more securing elements axially in a bore of the connecting rod.
- the securing of the changeover valve according to the invention by means of one or more securing elements axially in a bore of the connecting rod proves to be advantageous compared to the prior art, in which it is customary to press a change-over valve in a parallel to Pleuelaugen introduced bore in the connecting rod.
- the interference fit seals external grooves and bores on the changeover valve from each other and prevents a hydraulic short circuit.
- the press fit secures the switching valve against falling out in the axial direction.
- the press fit must be designed so that there is always a sufficiently large press-in force for all tolerances, wherein the press-in force is approximately equal to the extrusion force, and the material load limits are not exceeded.
- the maximum insertion force is additionally reduced by the material load during operation. It is best to install the changeover valve in a low loaded area, such as above conrod bolts, but this is not always possible due to the geometry of the engine.
- the changeover valve may be arranged, for example, centrally below the connecting rod in the connecting rod cover.
- tensile forces it comes at this point to strong deformations, which can also deform the bore for the switching valve oval.
- Excessively high insertion forces could lead to material fatigue and thus cause plastic deformation, which weakens the press fit over the service life.
- Another negative effect with excessive combined load could be that the deformation clamps the tapping element, which is very tight due to low leakage, and higher loads occur during the switching process.
- a transition fit or very small interference fit can be used in combination with a positive connection between the valve housing and the connecting rod.
- a transitional fit it is advantageous if play and thus leakage between the valve housing and connecting rod is possible. This can be kept as low as possible, but can conveniently due to the Leakage of Tap element to valve housing have a relatively small impact on the system behavior.
- a locking pin can be pressed together as a fuse element through the connecting rod cover and the valve housing.
- the locking pin in the connecting rod cover has minimal play.
- the connecting rod and the valve housing may have bores in which one or more locking pins are provided as a fuse elements are provided.
- the pressing of one or more locking pins as securing elements, preferably transversely to a press-in direction of the changeover valve, can ensure in a favorable manner that the changeover valve is secured against falling out of the connecting rod cover.
- the switching valve may be formed as described above and preferably be used sealless in the connecting rod cover.
- the interference fit can thereby seal out external grooves and bores on the changeover valve and prevent a hydraulic short circuit.
- the locking pin can be additionally provided as a locking pin as axial securing the switching valve in the connecting rod. This can be conveniently avoided to provide an additional locking pin, which simplifies the manufacture and installation of the connecting rod.
- a bore in the connecting rod cover for mounting the locking element may be provided in the valve housing of the changeover valve. This allows the locking element through the hole in the connecting rod in a simple Way are mounted in the valve housing and the tap element of the changeover valve.
- the holes may be provided as blind holes, which is advantageous in terms of residual dirt.
- the pressing-in process can be simplified in that the pressing-in process can take place in a block and no longer has to be monitored with respect to the path.
- the holes may have a clearance in which the one or more locking pins can be secured by forming against falling out.
- a backup of the locking pins is possible in a simple manner. Forming can be done, for example, by crimping the ends of the locking pins or similar suitable processes.
- the valve housing can be fixed by means of a frontal weld as a securing element to the connecting rod cover.
- a transition fit can be provided for the press-in operation of the change-over valve in the connecting rod cover.
- a weld on one or both end sides of the changeover valve and the connecting rod cover permanently fixes the changeover valve in the connecting rod cover.
- FIGS. 2 to 12 show various views and sections of a first embodiment of a switching valve 11, or of individual parts of the switching valve 11 of an inventive, in FIG. 1 shown connecting rod 1.
- connecting rod 1 has a connecting rod 34, comprising a Pleuel Sciences 29 and a connecting rod cover 30, and arranged at least partially in a Pleuellagerauge 2 adjustable eccentric adjustment device 6 with an eccentric 10.
- the eccentric adjusting device 6 is used to adjust an effective connecting rod length.
- As the connecting rod length of the distance of a central axis of a Hublagerauges 3 is defined to a central axis of the Pleuellagerauges 2.
- a rotation of the adjustable eccentric adjusting device 6 is initiated by the action of mass and load forces of the internal combustion engine, which act on the eccentric adjusting device 6 at a power stroke of the internal combustion engine.
- the rotary movement or adjustment is supported by hydraulic fluid, in particular engine oil, acted upon in the connecting rod 1 integrated piston 4, 5.
- the pistons 4, 5 thereby prevent the eccentric adjusting device 6 from being reset due to varying directions of force acting on the eccentric adjusting device 6.
- the pistons 4, 5 are operatively connected by means of eccentric rods 7, 8 on both sides with a lever 9 of the eccentric adjusting device 6.
- the pistons 4, 5 are arranged displaceably in hydraulic chambers and are acted upon by hydraulic fluid, not shown, with hydraulic fluid via non-visible check valves.
- the check valves prevent a backflow of the hydraulic fluid from the hydraulic chambers back into the hydraulic fluid lines and allow a Nachsaugen hydraulic fluid in the hydraulic chambers.
- the check valves may advantageously be integrated into the changeover valve 11, for example as ball or disc check valves or as band check valves. In the execution as a band check valves, for example, a position securing such as a bolt o.ä. be provided.
- the hydraulic fluid conduits connected to the hydraulic chambers all or at least partially interact with the switching valve 11.
- a first switching position S1 of the switching valve 11 which corresponds to a position of high compression of the connecting rod 1 (shown in FIG. 1 )
- a second switching position S2 of the changeover valve 11 which corresponds to a position of low compression of the connecting rod 1, the second hydraulic chamber connected to the discharge line.
- the discharge line is the connection to a supply of the connecting rod 1 with hydraulic fluid, for example via a groove in the Hublagerauge 3 of the connecting rod 1.
- the reversing valve 11 described in more detail below can also be provided for any other connecting rod for an internal combustion engine with variable compression, which has an eccentric adjusting device for adjusting an effective connecting rod length and at least one hydraulic chamber.
- the eccentric adjusting the connecting rod may be formed with a so-called swing motor system.
- FIG. 2 shows a plan view of the switching valve 11 with drawn sectional planes AA and BB.
- Figure 4 shows a longitudinal section through the switching valve 11 in the sectional plane AA, while FIG. 5 represents a longitudinal section in the sectional plane BB.
- the changeover valve 11 is arranged axially in a bore 23 of the connecting rod 1, for example, pressed.
- the valve housing 12 of the changeover valve 11 may be axially secured in the bore 23 of the connecting rod 1 by means of one or more locking pins.
- the one or more locking pins are in the cut in FIG. 2 not to be seen, since the locking pin is arranged in a different cutting plane.
- the connecting rod 1 holes 32 which in the second embodiment in FIG. 14 can be seen while the valve housing 12 corresponding thereto respectively bores 27 (in FIG. 9 shown), in which a locking pin can be provided pressed.
- the holes 32 of the connecting rod 1 are designed for ease of manufacture, for example, as through holes.
- FIG. 2 In cross section in FIG. 2 is the in the bore 23 of the connecting rod cover 30 pressed valve housing 12 of the switching valve with the guided inside the tap element 13 can be seen. Transverse to the axis of the valve housing 12 of the latching pin 18 is disposed in the bores 20, 21.
- the switching valve 11 has a tap body 12 disposed in a tap member 13, which in an axial direction L (see FIG. 4 ) displaceable either in a first switching position S1 or a second switching position S2 displaceable and by means of a spring-loaded locking element 14 either in the first or the second switching position S1, S2 can be locked.
- the latching element 14 has a spring element 15 arranged in a latching sleeve 33.
- a first hydraulic port 22 of the changeover valve 11 with a discharge port 26 and in the second shift position S2 a second hydraulic port 24 is connected to the discharge port 26, in particular FIG. 4 can be seen.
- the arranged in the valve housing 12 tap element 13 is selectively locked in the first switching position S1 or the second switching position S2.
- the latching element 14 and arranged in the latching element 14 spring element 15 are at least partially disposed in a transverse recess 16 of the tap element 13.
- the valve housing 12 has to in the axial Direction L to an axially limited first groove 17, in which the locking element 14 is arranged axially displaceable for limiting the switching path and for preventing rotation of the tapping element 13.
- the at least partial arrangement of the latching element 14 in the recess 16 is advantageous, since the guide length of the movable latching element 14 can be significantly increased in comparison to the known switching valves. The canting tendency and self-locking tendency can be reduced and a safe achievement of the end positions can be improved on their own.
- the spring design of the spring element 15 is not critical because of greater installation length compared to the prior art.
- the locking element 14 additionally serves as a stop element, which limits a displacement path of the tapping element 13 in the valve housing 12. As a result, the stop element can be omitted as an additional component.
- the locking element 14 is provided with the tapping element 13 axially displaceable together.
- the latching element 14 cooperates with a latching pin 18, which is arranged in the valve housing 12 in the region of the first groove 17.
- the latching element 14 In order to lock the reversing valve 11 in the two switching positions S1 and S2, the latching element 14 has a latching contour 19 which, in interaction with the latching pin 18, allows two latching positions for the latching element 14. As FIG. 4 can be seen, the latching element 14 can engage with its catch contour 19 on both sides of the locking pin 18 during axial displacement of the tapping element 13.
- FIG. 6 shows an isometric view of the switching valve 11 according to FIG. 3 while in the FIGS. 7, 8, 9 different side views of the switching valve 11 are shown.
- FIG. 9 is a sectional plane CC drawn, the cross section of the switching valve 11 in FIG. 10 is shown.
- FIG. 11 shows a further isometric view of the switching valve 11 and
- FIG. 12 a plan view of the switching valve 11th
- valve housing 12 in the region of the first groove 17 holes 20, 21, in which the locking pin 18 is provided pressed. Also, the discharge port 26 can be seen.
- FIG. 7 shows the arrangement of the two hydraulic ports 22, 24, while FIG. 8 shows the discharge port 26 as a slot.
- the connecting rod 1 For receiving a locking pin, the connecting rod 1 holes 32, as in the embodiment in FIG. 14 shown, while the valve housing 12 corresponding thereto respectively bores 27 (in FIG. 9 shown), in which a locking pin can be provided pressed.
- the holes 32 of the connecting rod 1 are designed for ease of manufacture, for example, as through holes.
- a bore of the connecting rod 1 could alternatively be formed as a blind hole, whereby advantageous residual dirt can be avoided. Furthermore, the pressing-in process can be simplified in that the pressing-in process no longer has to be monitored with respect to the path.
- FIG. 9 is further recognized by the groove 17 of the locking pin 18.
- FIGS. 13 to 17 shows a further embodiment of a connecting rod 1 according to the invention, which differs in that the locking pin 18 additionally serves as a locking pin.
- the locking pin 18 as a locking pin is provided as axial securing the switching valve 11 in the connecting rod 1.
- FIG. 13 shows a longitudinal section through the connecting rod 1, while in FIG. 14 an enlarged section Z of the longitudinal section according to FIG. 13 is shown with a focus on the switching valve 11 in a cross section.
- FIG. 15 shows an isometric view of the switching valve 11 according to FIG. 13
- FIG. 16 is a plan view of the switching valve 11 with marked Sectional plane AA shown while FIG. 17 shows a longitudinal section through the switching valve 11 in the sectional plane AA.
- the locking pin 18 is pressed by the connecting rod cover 30 and the valve housing 12.
- a bore 32 preferably a through hole is provided in the connecting rod cover 30, through which the locking pin 18 are inserted as a securing element and can be passed through holes 20, 21 in the valve housing 12.
- the locking pin 18 may protrude on both sides over the valve housing 12 so that it is anchored as a securing element in the bore 32 of the connecting rod cover 30.
- the holes 32 may be provided as blind holes.
- the holes 32 may conveniently have a clearance in which the one or more locking pins is secured by forming the ends, such as flanging, against falling out.
- the locking pin 18 is pressed only after pressing the valve housing 12.
- the assembly of the locking pin 18 is thus carried out after pressing the valve housing 12 into the bore 23 in the connecting rod 30.
- the connecting rod 30 is therefore advantageously at least one bore 31 is introduced, through which the locking element 14 can be introduced into the valve housing 12.
- a Langlochnut is conceivable.
- a temporary locking pin in the valve housing 12 which does not consist of the valve housing 12th protrudes and is pushed out by means of the final locking pin 18 during its assembly.
- the temporary detent pin may have an interference fit, a transition fit, or a clearance fit.
- valve housing 12 may also be fixed to the connecting rod cover 30 as a securing element by means of a frontal weld.
- locking pin 18 In the isometric representation in FIG. 15 is the longer than in the previous embodiment formed locking pin 18 can be seen, which passes transversely through the groove 17 of the valve housing 12 and extends beyond the valve housing 12 on both sides. Also, the discharge port 26 can be seen. The length of the locking pin 18 is also the top view in FIG. 16 refer to.
- FIG. 17 shows in longitudinal section the switching valve, which is substantially the representation of the first embodiment in FIG. 4 like. The difference is that no additional holes 27 are required for mounting an additional locking pin, so that the manufacture of the valve housing 12 can be simplified.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Multiple-Way Valves (AREA)
Abstract
Die Erfindung betrifft ein einen Pleuel (1) für eine Brennkraftmaschine mit variabler Verdichtung mit einer Exzenter-Verstelleinrichtung (6) im Pleuelkörper (29) zur Verstellung einer effektiven Pleuelstangenlänge, wobei ein Verstellweg der Exzenter-Verstelleinrichtung (6) mittels eines Umschaltventils (11) verstellbar ist, wobei ein Ventilgehäuse (12) des Umschaltventils (11) mittels einem oder mehreren Sicherungselementen axial in einer Bohrung (23) des Pleuels (1) gesichert vorgesehen ist.The invention relates to a connecting rod (1) for an internal combustion engine with variable compression with an eccentric adjusting device (6) in Pleuelkörper (29) for adjusting an effective connecting rod length, wherein a displacement of the eccentric adjusting device (6) by means of a switching valve (11). is adjustable, wherein a valve housing (12) of the changeover valve (11) by means of one or more securing elements axially in a bore (23) of the connecting rod (1) is provided secured.
Description
Die Erfindung betrifft einen Pleuel mit einem Umschaltventil zum Steuern eines Hydraulikflüssigkeitsstroms.The invention relates to a connecting rod with a switching valve for controlling a hydraulic fluid flow.
Bei Brennkraftmaschinen wirkt sich ein hohes Verdichtungsverhältnis positiv auf den Wirkungsgrad des Verbrennungsmotors aus. Unter Verdichtungsverhältnis wird im Allgemeinen das Verhältnis des gesamten Zylinderraumes vor der Verdichtung zum verbliebenen Zylinderraum nach der Verdichtung verstanden. Bei Brennkraftmaschinen mit Fremdzündung, insbesondere Ottomotoren, die ein festes Verdichtungsverhältnis aufweisen, darf das Verdichtungsverhältnis jedoch nur so hoch gewählt werden, dass bei Volllastbetrieb ein sogenanntes "Klopfen" der Brennkraftmaschine vermieden wird. Jedoch könnte für den weitaus häufiger auftretenden Teillastbereich der Brennkraftmaschine, also bei geringer Zylinderfüllung, das Verdichtungsverhältnis mit höheren Werten gewählt werden, ohne dass ein "Klopfen" auftreten würde. Der wichtige Teillastbereich einer Brennkraftmaschine kann verbessert werden, wenn das Verdichtungsverhältnis variabel einstellbar ist. Zur Verstellung des Verdichtungsverhältnisses sind beispielsweise Systeme mit variabler Pleuelstangenlänge bekannt, welche mit Hilfe von hydraulisch oder mechanisch betätigbaren Umschaltventilen eine Exzenter-Verstelleinrichtung eines Pleuels betätigen.In internal combustion engines, a high compression ratio has a positive effect on the efficiency of the internal combustion engine. Under compression ratio is generally understood the ratio of the entire cylinder space before compression to the remaining cylinder space after compression. In internal combustion engines with spark ignition, in particular gasoline engines, which have a fixed compression ratio, the compression ratio, however, may only be selected so high that a so-called "knocking" of the internal combustion engine is avoided during full load operation. However, for the much more frequently occurring partial load range of the internal combustion engine, that is to say with low cylinder filling, the compression ratio could be selected with higher values without "knocking" occurring. The important part load range of an internal combustion engine can be improved if the compression ratio is variably adjustable. To adjust the compression ratio For example, systems with variable connecting rod length known which operate by means of hydraulically or mechanically actuated changeover valves an eccentric adjustment of a connecting rod.
Ein gattungsgemäßer Pleuel ist beispielsweise aus der
Eine Aufgabe der Erfindung ist es, einen Pleuel mit einem verbesserten Umschaltventil zu schaffen.An object of the invention is to provide a connecting rod with an improved changeover valve.
Die vorgenannte Aufgabe wird mit den Merkmalen des unabhängigen Anspruchs gelöst.The above object is achieved with the features of the independent claim.
Günstige Ausgestaltungen und Vorteile der Erfindung ergeben sich aus den weiteren Ansprüchen, der Beschreibung und der Zeichnung.Favorable embodiments and advantages of the invention will become apparent from the other claims, the description and the drawings.
Nach einem Aspekt der Erfindung wird ein Pleuel für eine Brennkraftmaschine mit variabler Verdichtung vorgeschlagen, mit einer Exzenter-Verstelleinrichtung im Pleueldeckel zur Verstellung einer effektiven Pleuelstangenlänge. Ein Verstellweg der Exzenter-Verstelleinrichtung ist mittels eines Umschaltventils verstellbar. Dabei ist ein Ventilgehäuse des Umschaltventils mittels einem oder mehreren Sicherungselementen axial in einer Bohrung des Pleuels gesichert vorgesehen.According to one aspect of the invention, a connecting rod for an internal combustion engine with variable compression is proposed, with an eccentric adjusting device in the connecting rod cover for adjusting an effective connecting rod length. An adjustment of the eccentric adjusting device is adjustable by means of a switching valve. In this case, a valve housing of the changeover valve is provided secured by means of one or more securing elements axially in a bore of the connecting rod.
Die erfindungsgemäße Sicherung des Umschaltventils mittels einem oder mehreren Sicherungselementen axial in einer Bohrung des Pleuels erweist sich als vorteilhaft gegenüber dem Stand der Technik, bei dem es üblich ist, ein Umschaltventil in eine parallel zu Pleuelaugen eingebrachte Bohrung im Pleuel einzupressen. Der Pressverband dichtet dabei außenliegende Nuten und Bohrungen am Umschaltventil zueinander ab und verhindert einen hydraulischen Kurzschluss. Außerdem sichert der Pressverband das Umschaltventil gegen Herausfallen in Axialrichtung. Der Pressverband muss dabei so ausgelegt werden, dass bei allen Toleranzen immer eine genügend große Einpresskraft vorhanden ist, wobei die Einpresskraft ungefähr gleich der Auspresskraft ist, und auch die Materialbelastungsgrenzen nicht überschritten werden. Die maximale Einpresskraft wird zusätzlich durch die Materialbelastung während des Betriebs verringert. Am günstigsten ist es, das Umschaltventil in einem niedrig belasteten Bereich anzubringen, wie z.B. oberhalb von Pleuelschrauben, was aber aufgrund der Motorgeometrie nicht immer möglich ist.The securing of the changeover valve according to the invention by means of one or more securing elements axially in a bore of the connecting rod proves to be advantageous compared to the prior art, in which it is customary to press a change-over valve in a parallel to Pleuelaugen introduced bore in the connecting rod. The interference fit seals external grooves and bores on the changeover valve from each other and prevents a hydraulic short circuit. In addition, the press fit secures the switching valve against falling out in the axial direction. The press fit must be designed so that there is always a sufficiently large press-in force for all tolerances, wherein the press-in force is approximately equal to the extrusion force, and the material load limits are not exceeded. The maximum insertion force is additionally reduced by the material load during operation. It is best to install the changeover valve in a low loaded area, such as above conrod bolts, but this is not always possible due to the geometry of the engine.
Aus Gründen der Konstruktion des Kurbeltriebs kann das Umschaltventil so beispielsweise mittig unterhalb des Pleuels im Pleueldeckel angeordnet sein. Durch Zugkräfte kommt es an dieser Stelle zu starken Verformungen, die die Bohrung für das Umschaltventil ebenfalls oval verformen können. Zu hohe Einpresskräfte könnten zu Materialermüdung führen und damit plastische Verformungen verursachen, durch die der Pressverband über die Lebensdauer geschwächt wird. Im ungünstigsten Fall kann es zum Bruch des Umschaltventils kommen oder das Umschaltventil kann aus der Bohrung herausfallen. In beiden Fällen wäre ein Motorschaden die Folge. Ein weiterer negativer Effekt bei zu großer kombinierter Belastung könnte sein, dass die Verformung das Abgriffselement, welches wegen niedriger Leckage sehr eng geführt ist, einklemmt und im Schaltvorgang an sich höhere Belastungen auftreten.For reasons of construction of the crank mechanism, the changeover valve may be arranged, for example, centrally below the connecting rod in the connecting rod cover. By tensile forces it comes at this point to strong deformations, which can also deform the bore for the switching valve oval. Excessively high insertion forces could lead to material fatigue and thus cause plastic deformation, which weakens the press fit over the service life. In the worst case, it may lead to breakage of the changeover valve or the changeover valve may fall out of the bore. In both cases, an engine failure would result. Another negative effect with excessive combined load could be that the deformation clamps the tapping element, which is very tight due to low leakage, and higher loads occur during the switching process.
Erfindungsgemäß kann daher eine Übergangspassung oder sehr geringe Presspassung in Kombination mit einem Formschluss zwischen Ventilgehäuse und Pleuel eingesetzt werden. Bei einer Übergangspassung ist es vorteilhaft, wenn Spiel und dadurch Leckage zwischen Ventilgehäuse und Pleuel möglich ist. Diese kann so gering wie möglich gehalten werden, kann aber günstigerweise aufgrund der Leckagestelle von Abgriffselement zu Ventilgehäuse einen relativ geringen Einfluss auf das Systemverhalten haben.According to the invention, therefore, a transition fit or very small interference fit can be used in combination with a positive connection between the valve housing and the connecting rod. In a transitional fit, it is advantageous if play and thus leakage between the valve housing and connecting rod is possible. This can be kept as low as possible, but can conveniently due to the Leakage of Tap element to valve housing have a relatively small impact on the system behavior.
Vorteilhaft kann deshalb beispielsweise ein Rastpin als Sicherungselement zusammen durch den Pleueldeckel als auch das Ventilgehäuse gepresst werden. Vorteilhafterweise befindet sich nur ein Pressverband in dem Ventilgehäuse, während der Rastpin im Pleueldeckel minimales Spiel hat. Dadurch erhält man an dieser Stelle keine zusätzlichen Spannungen im Ventilgehäuse und Toleranzen bezüglich Konzentrizität der Bohrungen können ausgeglichen werden.Advantageously, therefore, for example, a locking pin can be pressed together as a fuse element through the connecting rod cover and the valve housing. Advantageously, there is only one interference fit in the valve housing, while the locking pin in the connecting rod cover has minimal play. As a result, no additional stresses in the valve housing and tolerances with respect to concentricity of the holes can be compensated at this point.
Gemäß einer vorteilhaften Ausgestaltung können der Pleuel und das Ventilgehäuse Bohrungen aufweisen, in welche ein oder mehrere Sicherungsstifte als Sicherungselemente eingepresst vorgesehen sind. Das Einpressen von ein oder mehreren Sicherungsstiften als Sicherungselemente, vorzugsweise quer zu einer Einpressrichtung des Umschaltventils, kann auf günstige Weise gewährleisten, dass das Umschaltventil gegen ein Herausfallen aus dem Pleueldeckel gesichert ist.According to an advantageous embodiment of the connecting rod and the valve housing may have bores in which one or more locking pins are provided as a fuse elements are provided. The pressing of one or more locking pins as securing elements, preferably transversely to a press-in direction of the changeover valve, can ensure in a favorable manner that the changeover valve is secured against falling out of the connecting rod cover.
Gemäß einer vorteilhaften Ausgestaltung kann das Umschaltventil wie vorstehend beschrieben ausgebildet sein und vorzugsweise dichtungslos im Pleueldeckel eingesetzt sein. Der Pressverband kann dabei außenliegende Nuten und Bohrungen am Umschaltventil zueinander abdichten und einen hydraulischen Kurzschluss verhindern. Durch die Montage im Pressverband kann auf eine zusätzliche Dichtung verzichtet werden.According to an advantageous embodiment, the switching valve may be formed as described above and preferably be used sealless in the connecting rod cover. The interference fit can thereby seal out external grooves and bores on the changeover valve and prevent a hydraulic short circuit. By mounting in the press fit can be dispensed with an additional seal.
Gemäß einer vorteilhaften Ausgestaltung kann der Rastpin als Sicherungsstift zusätzlich als Axialsicherung des Umschaltventils im Pleuel vorgesehen sein. Dadurch kann günstigerweise vermieden werden, einen zusätzlichen Sicherungsstift vorzusehen, was die Herstellung und Montage des Pleuels vereinfacht.According to an advantageous embodiment, the locking pin can be additionally provided as a locking pin as axial securing the switching valve in the connecting rod. This can be conveniently avoided to provide an additional locking pin, which simplifies the manufacture and installation of the connecting rod.
Gemäß einer vorteilhaften Ausgestaltung kann eine Bohrung im Pleueldeckel zur Montage des Rastelements in das Ventilgehäuse des Umschaltventils vorgesehen sein. Dadurch kann das Rastelement durch die Bohrung im Pleueldeckel in einfacher Weise in das Ventilgehäuse bzw. das Abgriffselement des Umschaltventils montiert werden.According to an advantageous embodiment, a bore in the connecting rod cover for mounting the locking element may be provided in the valve housing of the changeover valve. This allows the locking element through the hole in the connecting rod in a simple Way are mounted in the valve housing and the tap element of the changeover valve.
Gemäß einer vorteilhaften Ausgestaltung können die Bohrungen als Sacklochbohrungen vorgesehen sein, was vorteilhaft hinsichtlich Restschmutzes ist. Ferner kann der Einpressvorgang dadurch vereinfacht werden, dass der Einpressvorgang auf Block erfolgen kann und nicht mehr bezüglich des Weges überwacht werden muss.According to an advantageous embodiment, the holes may be provided as blind holes, which is advantageous in terms of residual dirt. Furthermore, the pressing-in process can be simplified in that the pressing-in process can take place in a block and no longer has to be monitored with respect to the path.
Gemäß einer vorteilhaften Ausgestaltung können die Bohrungen eine Spielpassung aufweisen, in welcher die ein oder mehrere Sicherungsstifte durch Umformen gegen Herausfallen gesichert sein können. Dadurch ist auf einfache Weise eine Sicherung der Sicherungsstifte möglich. Umformen kann beispielsweise durch Bördeln der Enden der Sicherungsstifte oder ähnliche geeignete Prozesse erfolgen.According to an advantageous embodiment, the holes may have a clearance in which the one or more locking pins can be secured by forming against falling out. As a result, a backup of the locking pins is possible in a simple manner. Forming can be done, for example, by crimping the ends of the locking pins or similar suitable processes.
Gemäß einer vorteilhaften Ausgestaltung kann das Ventilgehäuse mittels einer stirnseitigen Schweißnaht als Sicherungselement an dem Pleueldeckel fixiert sein. Günstigerweise kann eine Übergangspassung für den Einpressvorgang des Umschaltventils in den Pleueldeckel vorgesehen sein. Eine Schweißnaht an einer oder beiden Stirnseiten des Umschaltventils und dem Pleueldeckel fixiert das Umschaltventil dauerhaft im Pleueldeckel.According to an advantageous embodiment, the valve housing can be fixed by means of a frontal weld as a securing element to the connecting rod cover. Conveniently, a transition fit can be provided for the press-in operation of the change-over valve in the connecting rod cover. A weld on one or both end sides of the changeover valve and the connecting rod cover permanently fixes the changeover valve in the connecting rod cover.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In den Zeichnungen sind Ausführungsbeispiele der Erfindung dargestellt. Die Zeichnungen, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
- Fig. 1Fig. 1
- einen Längsschnitt durch ein erstes Ausführungsbeispiel eines erfindungsgemäßen Pleuels;a longitudinal section through a first embodiment of a connecting rod according to the invention;
- Fig. 2Fig. 2
-
einen vergrößerten Ausschnitt Z des Längsschnitts gemäß
Fig. 1 mit Fokus auf das Umschaltventil in einem Querschnitt;an enlarged section Z of the longitudinal section according toFig. 1 with focus on the switching valve in a cross section; - Fig. 3Fig. 3
- eine Draufsicht auf das Umschaltventil gemäß einem Ausführungsbeispiel der Erfindung mit eingezeichneten Schnittebenen A-A und B-B;a plan view of the switching valve according to an embodiment of the invention with marked sectional planes A-A and B-B;
- Fig. 4Fig. 4
-
einen Längsschnitt durch das Umschaltventil in der Schnittebene A-A gemäß
Fig. 3 ;a longitudinal section through the switching valve in the sectional plane AA according toFig. 3 ; - Fig. 5Fig. 5
-
einen weiteren Längsschnitt durch das Umschaltventil in der Schnittebene B-B gemäß
Fig. 3 ;a further longitudinal section through the switching valve in the sectional plane BB according toFig. 3 ; - Fig. 6Fig. 6
-
eine isometrische Darstellung des Umschaltventils gemäß
Fig. 3 ;an isometric view of the switching valve according toFig. 3 ; - Fig. 7Fig. 7
-
eine Seitenansicht des Umschaltventils gemäß
Fig. 3 ;a side view of the switching valve according toFig. 3 ; - Fig. 8Fig. 8
-
eine weitere Seitenansicht des Umschaltventils gemäß
Fig. 3 ;another side view of the switching valve according toFig. 3 ; - Fig. 9Fig. 9
-
eine weitere Seitenansicht des Umschaltventils gemäß
Fig. 3 mit eingezeichneter Schnittebene C-C;another side view of the switching valve according toFig. 3 with marked section plane CC; - Fig. 10Fig. 10
-
einen Querschnitt durch das Umschaltventil in der Schnittebene C-C gemäß
Fig. 9 ;a cross section through the switching valve in the sectional plane CC according toFig. 9 ; - Fig. 11Fig. 11
-
eine weitere isometrische Darstellung des Umschaltventils gemäß
Fig. 3 ;a further isometric view of the switching valve according toFig. 3 ; - Fig. 12Fig. 12
-
eine Draufsicht auf das Umschaltventil gemäß
Fig. 3 ;a plan view of the switching valve according toFig. 3 ; - Fig. 13Fig. 13
- einen Längsschnitt durch ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Pleuels;a longitudinal section through a further embodiment of a connecting rod according to the invention;
- Fig. 14Fig. 14
-
einen vergrößerten Ausschnitt Z des Längsschnitts gemäß
Fig. 13 mit Fokus auf das Umschaltventil in einem Querschnitt;an enlarged section Z of the longitudinal section according toFig. 13 with focus on the switching valve in a cross section; - Fig. 15Fig. 15
-
eine isometrische Darstellung des Umschaltventils gemäß
Fig. 13 ;an isometric view of the switching valve according toFig. 13 ; - Fig. 16Fig. 16
-
eine Draufsicht auf das Umschaltventil gemäß
Fig. 13 mit eingezeichneter Schnittebene A-A; unda plan view of the switching valve according toFig. 13 with marked section plane AA; and - Fig. 17Fig. 17
-
einen Längsschnitt durch das Umschaltventil in der Schnittebene A-A gemäß
Fig. 16 .a longitudinal section through the switching valve in the sectional plane AA according toFig. 16 ,
In den Figuren sind gleiche oder gleichartige Komponenten mit gleichen Bezugszeichen beziffert. Die Figuren zeigen lediglich Beispiele und sind nicht beschränkend zu verstehen.In the figures, the same or similar components are numbered with the same reference numerals. The figures are merely examples and are not intended to be limiting.
Die
Der in
Eine Verdrehung der verstellbaren Exzenter-Verstelleinrichtung 6 wird durch Einwirken von Massen- und Lastkräften der Brennkraftmaschine eingeleitet, die bei einem Arbeitstakt der Brennkraftmaschine auf die Exzenter-Verstelleinrichtung 6 wirken. Während eines Arbeitstaktes verändern sich die Wirkungsrichtungen der auf die Exzenter-Verstelleinrichtung 6 wirkenden Kräfte kontinuierlich. Die Drehbewegung oder Verstellbewegung wird durch mit Hydraulikflüssigkeit, insbesondere mit Motoröl, beaufschlagte, im Pleuel 1 integrierte Kolben 4, 5 unterstützt. Die Kolben 4, 5 verhindern dabei ein Rückstellen der Exzenter-Verstelleinrichtung 6 aufgrund variierender Kraftwirkungsrichtungen der auf die Exzenter- Verstelleinrichtung 6 wirkenden Kräfte.A rotation of the adjustable
Die Kolben 4, 5 sind mittels Exzenterstangen 7, 8 beidseitig mit einem Hebel 9 der Exzenter-Verstelleinrichtung 6 wirkverbunden. Die Kolben 4, 5 sind in Hydraulikkammern verschiebbar angeordnet und über nicht gezeigte Hydraulikflüssigkeitsleitungen mit Hydraulikflüssigkeit über nicht sichtbare Rückschlagventile beaufschlagt. Die Rückschlagventile verhindern dabei ein Rückfließen der Hydraulikflüssigkeit aus den Hydraulikkammern zurück in die Hydraulikflüssigkeitsleitungen und ermöglichen ein Nachsaugen von Hydraulikflüssigkeit in die Hydraulikkammern.
Die Rückschlagventile können vorteilhafterweise in das Umschaltventil 11 beispielsweise als Kugel- oder Tellerrückschlagventile oder als Bandrückschlagventile integriert sein. Bei der Ausführung als Bandrückschlagventile kann beispielsweise eine Lagesicherung wie ein Bolzen o.ä. vorgesehen sein. Die mit den Hydraulikkammern verbundenen Hydraulikflüssigkeitsleitungen wirken alle oder wenigstens teilweise mit dem Umschaltventil 11 zusammen. In einer ersten Schaltstellung S1 des Umschaltventils 11, welche einer Stellung hoher Verdichtung des Pleuels 1 entspricht (dargestellt in
The check valves may advantageously be integrated into the
Das nachfolgend näher beschriebene Umschaltventil 11 kann aber auch für jeden anderen Pleuel für eine Brennkraftmaschine mit variabler Verdichtung vorgesehen sein, welche eine Exzenter-Verstelleinrichtung zur Verstellung einer effektiven Pleuelstangenlänge und wenigstens einer Hydraulikkammer aufweist. Beispielsweise kann die Exzenter-Verstelleinrichtung des Pleuels mit einem sogenannten Schwenkmotor-System ausgebildet sein.However, the reversing
Das Umschaltventil 11 ist in
Wie in
Zur Aufnahme des nicht gezeigten Sicherungsstiftes weist der Pleuel 1 Bohrungen 32 auf, welche im zweiten Ausführungsbeispiel in
Im Querschnitt in
Im Längsschnitt des Umschaltventils 11 in
Das Umschaltventil 11 weist ein in einem Ventilgehäuse 12 angeordnetes Abgriffselement 13 auf, welches in einer axialen Richtung L (siehe
Das in dem Ventilgehäuse 12 angeordnete Abgriffselement 13 ist wahlweise in der ersten Schaltstellung S1 oder der zweiten Schaltstellung S2 arretierbar. Hierfür sind das Rastelement 14 und das in dem Rastelement 14 angeordnete Federelement 15 wenigstens teilweise in einer quer ausgebildeten Ausnehmung 16 des Abgriffselements 13 angeordnet. Das Ventilgehäuse 12 weist dazu in der axialen Richtung L eine axial begrenzte erste Nut 17 auf, in welcher das Rastelement 14 zur Begrenzung des Schaltweges und zur Verdrehsicherung des Abgriffselements 13 axial verschiebbar angeordnet ist. Die zumindest teilweise Anordnung des Rastelementes 14 in der Ausnehmung 16 ist von Vorteil, da die Führungslänge des beweglichen Rastelementes 14 im Vergleich zu den bekannten Umschaltventilen entscheidend vergrößert werden kann. Die Verkantungsneigung und Selbsthemmungsneigung kann verringert und ein sicheres Erreichen der Endlagen aus eigener Kraft verbessert werden. Zudem ist die Federauslegung des Federelements 15 wegen größerer Einbaulänge im Vergleich zum Stand der Technik nicht kritisch.The arranged in the
Das Rastelement 14 dient zusätzlich als Anschlagelement, welches einen Verschiebeweg des Abgriffselements 13 im Ventilgehäuse 12 begrenzt. Dadurch kann das Anschlagelement als zusätzliches Bauteil entfallen. Das Rastelement 14 ist mit dem Abgriffselement 13 zusammen axial verschiebbar vorgesehen. Das Rastelement 14 wirkt mit einem Rastpin 18 zusammen, welcher im Ventilgehäuse 12 im Bereich der ersten Nut 17 angeordnet ist.The locking
Um das Umschaltventil 11 in den beiden Schaltstellungen S1 und S2 zu arretieren, weist das Rastelement 14 eine Rastkontur 19 auf, welche im Zusammenspiel mit dem Rastpin 18 zwei Rastpositionen für das Rastelement 14 ermöglicht. Wie
Wie
Die Seitenansicht in
Zur Aufnahme eines Sicherungsstiftes weist der Pleuel 1 Bohrungen 32 auf, wie bei dem Ausführungsbeispiel in
Eine Bohrung des Pleuels 1 könnte alternativ als Sacklochbohrung ausgebildet sein, wodurch vorteilhaft Restschmutz vermieden werden kann. Ferner kann der Einpressvorgang dadurch vereinfacht werden, dass der Einpressvorgang nicht mehr bezüglich des Weges überwacht werden muss.A bore of the connecting
In
Den
Wie insbesondere dem vergrößerten Ausschnitt in
Alternativ können die Bohrungen 32 auch als Sacklochbohrungen vorgesehen sein. Die Bohrungen 32 können günstigerweise eine Spielpassung aufweisen, in welcher der ein oder mehrere Sicherungsstifte durch Umformen der Enden, beispielsweise Umbördeln, gegen Herausfallen gesichert ist.Alternatively, the
Für die Montage ergibt sich die Situation, dass das Umschaltventil 11 nicht mehr vormontiert werden kann, da der Rastpin 18 erst nach Einpressen des Ventilgehäuses 12 eingepresst wird. Die Montage des Rastpins 18 erfolgt also nach dem Einpressen des Ventilgehäuses 12 in die Bohrung 23 im Pleueldeckel 30. Im Pleueldeckel 30 ist daher zweckmäßigerweise mindestens eine Bohrung 31 eingebracht, durch welche das Rastelement 14 in das Ventilgehäuse 12 eingebracht werden kann. Alternativ ist eine Langlochnut denkbar.For assembly results in the situation that the switching
Als weitere alternative Ausführung kann vorgesehen sein, einen temporären Rastpin in das Ventilgehäuse 12 zu montieren, welcher nicht aus dem Ventilgehäuse 12 heraussteht und mittels des endgültigen Rastpins 18 bei dessen Montage herausgestoßen wird. Der temporäre Rastpin kann eine Presspassung, eine Übergangspassung oder eine Spielpassung haben.As a further alternative embodiment can be provided to mount a temporary locking pin in the
In einer alternativen Ausführungsform kann das Ventilgehäuse 12 jedoch auch mittels einer stirnseitigen Schweißnaht als Sicherungselement an dem Pleueldeckel 30 fixiert sein.In an alternative embodiment, however, the
In der isometrischen Darstellung in
Claims (8)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017120255 | 2017-09-04 | ||
DE102018107108.6A DE102018107108A1 (en) | 2017-09-04 | 2018-03-26 | Switching valve for controlling a hydraulic fluid flow and connecting rod for a variable compression internal combustion engine with a switching valve |
EP18189918.8A EP3450720A3 (en) | 2017-09-04 | 2018-08-21 | Switching valve for controlling a hydraulic fluid stream and connecting rod for a combustion engine with variable compression with a switching valve |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18189918.8A Division EP3450720A3 (en) | 2017-09-04 | 2018-08-21 | Switching valve for controlling a hydraulic fluid stream and connecting rod for a combustion engine with variable compression with a switching valve |
EP18189918.8A Division-Into EP3450720A3 (en) | 2017-09-04 | 2018-08-21 | Switching valve for controlling a hydraulic fluid stream and connecting rod for a combustion engine with variable compression with a switching valve |
Publications (2)
Publication Number | Publication Date |
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EP3502436A1 true EP3502436A1 (en) | 2019-06-26 |
EP3502436B1 EP3502436B1 (en) | 2020-11-04 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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EP18189918.8A Withdrawn EP3450720A3 (en) | 2017-09-04 | 2018-08-21 | Switching valve for controlling a hydraulic fluid stream and connecting rod for a combustion engine with variable compression with a switching valve |
EP19150637.7A Active EP3502436B1 (en) | 2017-09-04 | 2018-08-21 | Connecting rod for a combustion engine with variable compression with a switching valve |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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EP18189918.8A Withdrawn EP3450720A3 (en) | 2017-09-04 | 2018-08-21 | Switching valve for controlling a hydraulic fluid stream and connecting rod for a combustion engine with variable compression with a switching valve |
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Families Citing this family (1)
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DE102019121107A1 (en) * | 2019-08-05 | 2021-02-11 | ECO Holding 1 GmbH | Connecting rod for an internal combustion engine with variable compression |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012112461A1 (en) | 2012-12-18 | 2014-06-18 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Reversing valve for controlling engine oil of internal combustion engine i.e. petrol engine, in motor car, has groove connecting first and second hydraulic fluid lines to vent channel in first and second switch positions, respectively |
WO2014166636A1 (en) * | 2013-04-12 | 2014-10-16 | Fev Gmbh | Switching valve and internal combustion engine having such a switching valve and a method for a switching valve |
DE102015202056A1 (en) * | 2015-02-05 | 2016-08-11 | Schaeffler Technologies AG & Co. KG | Valve housing for a bivalent switching valve |
US20160245331A1 (en) * | 2015-02-25 | 2016-08-25 | Fev Gmbh | Internal combustion engine with settable variable compression ratio and with a switching module |
DE102015111175A1 (en) * | 2015-03-26 | 2016-09-29 | Hilite Germany Gmbh | Hydraulic valve and connecting rod with a hydraulic valve |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013105389B4 (en) * | 2013-05-27 | 2021-12-23 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Changeover valve and internal combustion engine with such a changeover valve |
DE102015100662A1 (en) * | 2014-12-19 | 2016-06-23 | Hilite Germany Gmbh | Hydraulic valve for switching a control piston of a connecting rod |
DE102015202065A1 (en) * | 2015-02-05 | 2016-08-11 | Schaeffler Technologies AG & Co. KG | Reversing valve with reset function for an internal combustion engine |
DE102015202051A1 (en) * | 2015-02-05 | 2016-08-11 | Schaeffler Technologies AG & Co. KG | switching valve |
DE102015203417B4 (en) * | 2015-02-26 | 2016-09-15 | Schaeffler Technologies AG & Co. KG | switching valve |
-
2018
- 2018-08-21 EP EP18189918.8A patent/EP3450720A3/en not_active Withdrawn
- 2018-08-21 EP EP19150637.7A patent/EP3502436B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012112461A1 (en) | 2012-12-18 | 2014-06-18 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Reversing valve for controlling engine oil of internal combustion engine i.e. petrol engine, in motor car, has groove connecting first and second hydraulic fluid lines to vent channel in first and second switch positions, respectively |
WO2014166636A1 (en) * | 2013-04-12 | 2014-10-16 | Fev Gmbh | Switching valve and internal combustion engine having such a switching valve and a method for a switching valve |
DE102015202056A1 (en) * | 2015-02-05 | 2016-08-11 | Schaeffler Technologies AG & Co. KG | Valve housing for a bivalent switching valve |
US20160245331A1 (en) * | 2015-02-25 | 2016-08-25 | Fev Gmbh | Internal combustion engine with settable variable compression ratio and with a switching module |
DE102015111175A1 (en) * | 2015-03-26 | 2016-09-29 | Hilite Germany Gmbh | Hydraulic valve and connecting rod with a hydraulic valve |
Also Published As
Publication number | Publication date |
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EP3502436B1 (en) | 2020-11-04 |
EP3450720A3 (en) | 2019-04-24 |
EP3450720A2 (en) | 2019-03-06 |
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