WO2016083592A1 - Moteur à combustion interne à taux de compression réglable et bielle pour un tel moteur à combustion interne - Google Patents

Moteur à combustion interne à taux de compression réglable et bielle pour un tel moteur à combustion interne Download PDF

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Publication number
WO2016083592A1
WO2016083592A1 PCT/EP2015/077953 EP2015077953W WO2016083592A1 WO 2016083592 A1 WO2016083592 A1 WO 2016083592A1 EP 2015077953 W EP2015077953 W EP 2015077953W WO 2016083592 A1 WO2016083592 A1 WO 2016083592A1
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WO
WIPO (PCT)
Prior art keywords
connecting rod
switching element
hydraulic
switch
inlet
Prior art date
Application number
PCT/EP2015/077953
Other languages
German (de)
English (en)
Inventor
Uwe Schaffrath
Original Assignee
Fev Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fev Gmbh filed Critical Fev Gmbh
Priority to DE112015005354.9T priority Critical patent/DE112015005354A5/de
Publication of WO2016083592A1 publication Critical patent/WO2016083592A1/fr

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/06—Adjustable connecting-rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/10—Bearings, parts of which are eccentrically adjustable with respect to each other

Definitions

  • the invention relates to an internal combustion engine with an adjustable compression ratio and a connecting rod for such an internal combustion engine.
  • the invention relates to a reciprocating piston engine and a connecting rod for a reciprocating piston engine, in particular for a reciprocating internal combustion engine.
  • Such reciprocating engines have z.
  • B. a connecting rod with an adjusting mechanism by means of which compression ratio of the reciprocating engine can be adjusted.
  • the connecting rod furthermore has a first hydraulic line, a second hydraulic line, a hydraulic outlet and a switch for switching the adjusting mechanism, wherein the switch is arranged on the connecting rod.
  • the first hydraulic line In a first position of the switch, the first hydraulic line is fluid-conductively connected to the hydraulic drain.
  • a fluid connection between the second hydraulic line and the hydraulic outlet is interrupted.
  • the second hydraulic line is fluid-conductively connected to the hydraulic drain, while a fluid connection between the first hydraulic line and the hydraulic outlet is interrupted.
  • Such an internal combustion engine is known from DE-A-10 2005 055 199, DE-A-10 2011 108 709, WO-A-2014/019684 and WO-A-2014/019683.
  • the adjustable variable compression ratio is controlled by alternately releasing and locking a first and a second hydraulic line within a connecting rod.
  • the release of the first hydraulic line releases the blockage of the movement of the adjustment mechanism to a first position of the adjustment mechanism (preventing its return movement) corresponding to the first compression ratio of the internal combustion engine
  • Release of the second hydraulic line the blockage of the movement of the adjusting mechanism to the second position lifts (and prevents its return movement), which corresponds to the second compression ratio.
  • the blocking and releasing of the respective hydraulic lines takes place according to DE-A-10 2011 108 790 by means of a slide valve. To avoid excessive leakage losses between the hydraulic lines and the spool valve recesses for the spool valve within the connecting rod are very precise. Such demands on the precision of production entails a comparatively complicated production process for the connecting rod.
  • Object of the present invention is therefore to provide an internal combustion engine, which allows a comparatively simple production of a connecting rod with an adjustment mechanism for an adjustable variable compression ratio of an internal combustion engine.
  • a reciprocating piston engine having an adjustable compression ratio, in particular an internal combustion engine is proposed which is provided with
  • a housing in which at least one cylinder cavity is formed and a crankshaft is arranged
  • At least one compression piston which is guided in the cylinder cavity movable back and forth, and
  • connecting rod which has a connecting rod body for connecting the crankshaft to the at least one compression piston
  • connecting rod body is provided with
  • an adjusting element for adjusting the first and / or the second bearing in order to change the distance between the two bearings for adjusting one of at least two different compression ratios
  • a hydraulically operating adjusting mechanism operatively connected to the adjusting element for selectively blocking or releasing the adjusting element
  • the adjusting mechanism further comprises a first and a second hydraulic channel respectively formed in the connecting rod body,
  • a switching element which is arranged movably between a first end position and a second end position in a receiving space formed in the connecting rod body and has a first inlet bore, a second inlet bore and an outlet bore, which are in fluid communication with one another via a chamber formed in the switching element,
  • the invention proposes a connecting rod for a reciprocating piston engine having an adjustable compression ratio, in particular for an internal combustion engine,
  • connecting rod body is provided with
  • a second bearing for the crankshaft an adjusting element for adjusting the first and / or the second bearing in order to change the distance between the two bearings for adjusting one of at least two different compression ratios and
  • a hydraulically operating adjusting mechanism operatively connected to the adjusting element for selectively blocking or releasing the adjusting element
  • the adjusting mechanism further comprises
  • a switching element which is arranged movably between a first end position and a second end position in a receiving space formed in the connecting rod body and has a first inlet bore, a second inlet bore and an outlet bore, which are in fluid communication with one another via a chamber formed in the switching element,
  • the switching element forms a switching valve for selectively connecting the first hydraulic channel with the hydraulic drainage channel (with simultaneous foreclosure of the second hydraulic channel) or for connecting the second hydraulic channel with the hydraulic drainage channel (with simultaneous foreclosure of the first hydraulic channel).
  • the switching element was previously the optional mechanical activation or deactivation of switching valves, which, for example, via the switching element actuated plunger odgl. Controls took place.
  • the channels for the hydraulic circuit were thus formed in the Pleuel Sciences itself, which is especially for blinds or the like. Flow throttling was applied, which were necessary to limit the maximum flow velocities in the hydraulic circuit, so that damage to the hydraulic circuit through cavities, washouts or the like. could be prevented.
  • the switching element according to the invention is flow-through component of the hydraulic circuit, the panels can be integrated into the switching element, so no longer need to be formed in the connecting rod body. This leads to manufacturing advantages and thus the reduction of manufacturing costs.
  • the effective length of the connecting rod adjusting adjusting element is released in a direction of movement, ie unidirectional.
  • the adjustment can be adjusted in one direction, so for example, from the small effective connecting rod length to the large effective connecting rod length.
  • this adjustment movement ung a return movement of the adjustment is not possible.
  • the adjusting element is used to change the effec- moving the length of the connecting rod from the smallest effective length to the largest effective length.
  • the adjusting mechanism expediently has hydraulically operating piston / cylinder support units, as described by way of example in the abovementioned documents. In that regard, reference is made to these documents, with their content belongs to the subject of the present application.
  • the two inlet bores of the switching element each have a cross-sectional area whose size is selected to limit the flow rate of hydraulic fluid through the hydraulic channel in fluid communication with one of the two inlet bores of the switching element in the two end positions of the switching element is.
  • a latching mechanism is provided for latching fixing the switching element in each of its two end positions against unwanted movements from the respective end position in an advantageous continuation of the invention.
  • This locking mechanism expediently has a spring-loaded latching element which is received in a bore in the connecting rod body. After the locking element so a hole in the connecting rod body should be present, it is advantageous, instead of an additional hole to use the hydraulic drain channel for receiving the spring-loaded locking element.
  • the locking element emerges in the two end positions of the switch in each case another one of two detents. In each case, an outlet bore of the switching element ends in each detent recess. This makes it possible to use the hydraulic outlet channel of the connecting rod body twice, on the one hand for the discharge of hydraulic oil and on the other hand for receiving the locking element.
  • the latching mechanism comprises a spring-loaded detent element which is arranged in the hydraulic drainage channel and biased towards the receiving space of the connecting rod body and partially protrudes into this, that the switching element has on its outside two detent recesses, of which one receiving the latching element in the first end position of the switching element and the other the latching element in the second end position of the switching element, and that in each latching recess ends in fluid communication with the chamber of the switching element outlet bore of the switching element.
  • the latching element does not seal the outlet bores in the respective latching recesses with its substantially spherical front side when the latching element is immersed in the latching recess.
  • Seen from the detent recess behind the locking element is expediently a coil spring, the odgl in the hydraulic drainage channel on a shoulder. supported.
  • the latching element is provided with at least one hydraulic bore which extends from the front side of the latching element to its rear side and ends there in a region of the rear side which is surrounded by the coil spring.
  • the fluid flowing through the hydraulic drainage channel passes through the interior of the coil spring so that it is as little as possible influenced by the hydraulic fluid flow.
  • the latching element has a structure which allows a fluid transfer from the front to the back of the latching element, preferably (even) into the area of the rear side surrounded by the coil spring.
  • either the switching element or the connecting rod body has a slot in which a movement limiting pin to limit the movement of the switching element protrudes in its two end positions, wherein movement limiting pin projecting either over the inside of the receiving space of the connecting rod or on the outside of the switching element.
  • the movement limiting pin also has the function of preventing rotation.
  • the switching element does not necessarily have to perform a translatory movement during its movement between the two end positions; It is also possible that the switching element is guided pivotably or in another manner movable between the two end positions in the receiving bore.
  • the receiving space of Pleuel stressess is formed hollow cylindrical and with open end faces and that the switching element is designed as a bolt which is arranged laterally displaceable back and forth in the hollow cylindrical receiving space, wherein the switching element in each of its both end positions with another of its two axial ends projecting beyond the connecting rod body.
  • the hydraulic outlet channel ends in one of the two bearings of the connecting rod body.
  • the bearing of the connecting rod body, with which the connecting rod is mounted on the crankshaft offers itself.
  • the switching element is arranged in the connecting rod or in the connecting rod cover, which together form the crankshaft bearing of the connecting rod. Basically, however, that the switching element can be arranged at any point of the connecting rod body; The preferred location to be selected on the connecting rod may depend inter alia on the type of engine (inline, V or boxer engine).
  • an internal combustion engine with an adjustable variable compression ratio and a connecting rod is proposed.
  • the connecting rod has an adjusting mechanism for adjusting the adjustable variable compression ratio, a first hydraulic line, a second hydraulic line, a hydraulic outlet and a switch for switching the adjusting mechanism.
  • the switch is arranged on the connecting rod and has a first inlet, a second inlet and a drain.
  • the first hydraulic line In a first position of the switch, the first hydraulic line is fluid-conductively connected to the hydraulic outlet via the first inlet and the outlet, and a fluid connection between the second hydraulic line and the hydraulic outlet is interrupted. In a second position of the switch, the second hydraulic line is fluid-conductively connected to the hydraulic outlet via the second inlet and the outlet, and a fluid connection between the first hydraulic line and the hydraulic outlet is interrupted.
  • first inlet has a first passage and the second inlet has a second passage.
  • the switch has a sealing surface
  • Sealing surface delimits the first inlet of the second inlet.
  • the sealing surface preferably directly adjoins a contact surface of the connecting rod.
  • only a lubricant film is formed between the sealing surface and the contact surface, wherein the lubricant film does not form a hydraulic supply for the switch or connecting rod.
  • the switch and the connecting rod are movable relative to each other, wherein the first passage and the second passage when switching from the first position to the second position and vice versa with the switch moves.
  • the relative movement between the switch and the connecting rod can be realized for example by means of a clearance fit.
  • the adjusting mechanism of the connecting rod may be formed, for example, as described in DE-A-10 2005 055 199.
  • the connecting rod has a large connecting rod bearing eye and a small connecting rod eye, wherein in the small connecting rod eye an eccentric is arranged, which is rotatably mounted.
  • the eccentric is connected to a lever system, whereby individual levers of the lever system can be actuated by means of rods.
  • the rods each terminate a first and a second working space, wherein the working spaces are subjected to a fluid pressure, which is built up via a fluid supply via a crankshaft of the internal combustion engine and a connecting rod bearing of the large connecting rod bearing eye.
  • the two working chambers are further connected to a respective first and a second hydraulic line, wherein depending on the desired direction of rotation of the eccentric, the first or the second hydraulic line can be released.
  • a hydraulic line is released, then fluid pressure in the associated working space can not build up as much as in the other working space, the hydraulic line of which is not released.
  • the switch which releases either the first or the second hydraulic line, so that fluid can flow out of the respective hydraulic lines, a respectively different pressure in the respective work spaces are built up and thus a different force on the respective rods or individual lever, which move the eccentric, be exercised.
  • the eccentric can move in a first or in an opposite second direction, whereby the effective length of the connecting rod is either increased or decreased.
  • a first compression ratio or a second compression ratio of the internal combustion engine can be established.
  • the first position of the switch corresponds to the first compression ratio of the internal combustion engine and the second position of the switch corresponds to the second of the first different compression ratio of the internal combustion engine.
  • the connecting rod has a Pleuel Sciences with a connecting rod shank, a connecting rod and a connecting rod bearing cap, the connecting rod and the connecting rod bearing cap together form a connecting rod of the connecting rod.
  • the switch for switching the adjusting mechanism on the connecting rod bearing cover is arranged, preferably in the lower region in the vicinity of a central axis of the connecting rod bearing cap.
  • the first hydraulic line and the second hydraulic line are also arranged in the connecting rod bearing cap.
  • the hydraulic outlet to which the first or the second hydraulic line is connected depending on the switch position via the first and second inlet and the outlet of the switch, has an opening which is directed downwards, ie away from the crankshaft in one direction from the cylinder head of the internal combustion engine.
  • the switch is designed in such a way that a first channel, which connects the first passage to the drain, is separated from a second passage, which connects the second passage to the drain, ie. is formed at least at one point fluid-tight relative to the second channel.
  • the sealing surface preferably adjoins the first inlet from the second inlet on the outer side (surface) of the switch. Between the two inlets and the outflow of the switch, there are outer side (surface) areas that form the sealing surface.
  • the first channel extends from the first passage to the outlet through the interior of the switch and the second channel from the second passage to the outlet through the interior of the switch.
  • the switch has a first and a second outflow, wherein the first passage from the first passage to the first outflow and the second passage from the second passage to the second outflow, in this embodiment, the first channel from the second channel completely through the Inside the switch is disconnected.
  • the interior of the switch has a first and a second outflow, wherein the first passage from the first passage to the first outflow and the second passage from the second passage to the second outflow, in this embodiment, the first channel from the second channel completely through the Inside the switch is disconnected.
  • Switch may in one embodiment be a cast steel, in another embodiment an aluminum die-cast product and in another embodiment a sintered component.
  • first and / or second passage is lowered relative to the sealing surface.
  • first and / or second passage may be formed as a hole machined in a round planar surface which is lowered relative to the sealing surface.
  • Passage ie, the second inlet bore on a second, opposite the first side lying, is arranged.
  • Such an arrangement causes a comparatively higher sealing length in contrast to an arrangement in which the first passage is arranged adjacent to the second passage and not on an opposite side of the second passage.
  • sealing length is to be understood as the length of a path along which fluid should flow from the first passage to reach the second passage. It should be noted that the sealing surface against the contact surface of the connecting rod obstructs a fluid flow, but preferably does not completely seal, so that a slight fluid movement between the first passage and the second passage may be present.
  • This fluid movement has a fluid mass flow in the first or second passage, which is preferably less than one hundredth of a fluid mass flow, which averaged when releasing the first and second hydraulic line via a cycle of the internal combustion engine.
  • the fluid travels a certain distance, the sealing length being defined as a length of the shortest possible path between the first passage and the second passage.
  • a higher sealing length can cause a higher sealing of the first hydraulic line with respect to the second hydraulic line, in particular in the case of tolerance values between the sealing surface and the contact surface of the connecting rod given by a production.
  • An embodiment of the first or second passage as a first or second surface lowered in relation to the sealing surface, respectively
  • the second hole preferably favors a simple production of the first or second passage, particularly advantageously taking into account a predetermined first cross-sectional area of the first passage and a predetermined second cross-sectional area of the second passage.
  • the predetermined cross-sectional areas are particularly advantageously oriented towards the predetermined outflow rate of the fluid from the first or second hydraulic line, whereby the cross-sectional areas perform the function of flow orifices or restrictors.
  • the first and the second passage are each in the form of a flow-through orifice, which ensures targeted braking of the fluid flowing out of the respective working space, and preferably of the rods during adjustment. causes the variable compression ratio.
  • a respective flow aperture is formed by means of the first and / or second cross-sectional area of the first and / or second passage opposite the diameters of the first and the second hydraulic line.
  • the first cross-sectional area of the first passage and / or the second cross-sectional area of the second passage of the switch a first flow rate or a second flow rate of a fluid from the first and second hydraulic line through the first and second passage in adjusting the Adjusting mechanism in front.
  • the accuracy of a flow rate of a fluid from the corresponding hydraulic lines through the respective passages is preferably predetermined by the respective tolerance of the first or second cross-sectional area, for example by a tolerance of a first diameter value of the first cross-sectional area and / or a tolerance of a second diameter value of a second cross-sectional area ,
  • the inventive design of the internal combustion engine, the connecting rod and the switch with the first and the second passage, the first and the second hydraulic line can be made simpler, while no special requirements in terms of tolerance or surface quality must be met. All precision machining For example, for setting the first or second flow rate of the fluid from the first and the second hydraulic line through the first and second passage, limited to the switch or on the first and / or second passage. This can be achieved particularly advantageously if the first and the second passage is not a static part of the connecting rod, but the switch that moves during switching has the first passage and the second passage itself, but it must be ensured that the sealing surface delimits the first inlet from the second inlet, so that the first inlet is sealed by the second inlet during a movement of the switch.
  • the switch has the first inlet with the first passage and the second inlet with the second passage and the sealing surface, wherein the sealing surface delimits the first inlet from the second inlet and the first passage and the second passage when switching from the first position moved to the second position and vice versa with the switch.
  • first passage and the second passage move synchronously when switching from the first position to the second position of the switch with the switch. Particularly advantageous moves the entire switch when switching from the first
  • Position to the second position i. all components associated with the switch, such as the first passage, the second passage and the drain.
  • the passages recessed with respect to the sealing surface allow movement of the passages with the switch when switching from the first position to the second position and vice versa.
  • the first passage has a different cross-sectional area with respect to the second passage.
  • the second passage may be made smaller in diameter than the first passage. This can be advantageous, for example, due to a first pressure in the first working space whose volume is changed by utilizing inertial forces of the internal combustion engine compared with a higher second pressure in the second working space compared to the first pressure whose volume is changed by utilizing gas forces be.
  • the sealing surface directly adjacent to the connecting rod and cooperating with a sliding surface of the connecting rod, a sliding direction of the switch when switching from the first to the second position and vice versa may be formed as a sliding surface.
  • the switch has a fixing element for fixing the switch in the first position and preferably in the second position.
  • the fixation element has a blockage for a rotation of the switch about an axis, which preferably runs parallel to the direction of movement of the switch when switching from the first position to the second position and vice versa.
  • Rastianssvortechnische has for fixing the switch.
  • the Rast réellesvortechnik is disposed within the connecting rod bearing cap.
  • the connecting rod has an adjusting mechanism for adjusting the adjustable variable compression ratio, a first hydraulic line, a second hydraulic line, a hydraulic outlet and a switch for switching the adjusting mechanism.
  • the switch is arranged on the connecting rod and has a first inlet, a second inlet and a drain, wherein in a first position of the switch the first hydraulic line is hydraulically connected to the hydraulic drain via the first inlet and via the drain and a fluid connection between the second hydraulic line and the hydraulic flow is interrupted. In a second position of the switch, the second hydraulic line is connected to the hydraulic outlet via the second inlet and the outlet is fluid-tight. tend connected and a fluid connection between the first hydraulic line and the hydraulic flow interrupted.
  • the proposed method includes, for. For example, the following steps: In a first step, the switch with the first inlet, a first passage, the second inlet and a second passage is inserted into the connecting rod bearing cap. In a further second step, the connecting rod is inserted into the internal combustion engine. In a further third step, the big end of the connecting rod is assembled with the connecting rod bearing cap.
  • the individual steps can be carried out in the order mentioned but also in a different order. These can also be carried out immediately after one another as well as one or more further intermediate steps can be executed therebetween.
  • the insertion of the switch takes place by means of pushing the switch into an opening (receiving space) of the connecting rod bearing cover.
  • the opening may for example be designed as a bore.
  • a particular embodiment of the method provides that the connecting rod bearing cap is separated before insertion of the switch in the connecting rod bearing cap of the connecting rod foot.
  • Another step may provide that at least a first bearing shell in the large connecting rod eye and / or at least a second bearing shell in the small connecting rod eye of the connecting rod is inserted and then the switch is inserted into the connecting rod bearing cap.
  • a step may be provided in which the connecting rod root is applied to the crankshaft.
  • the steps can be carried out in the following order:
  • a first step the connecting rod is inserted into the internal combustion engine.
  • the switch with the first inlet, a first passage, the second inlet and a second passage is inserted into the connecting rod bearing cap.
  • the connecting rod foot is assembled with the connecting rod bearing cap.
  • a first bore is incorporated as a receptacle for the switch.
  • This first bore can be worked into the connecting rod bearing cover particularly advantageously if the connecting rod bearing cap is already separated from the big end of the connecting rod.
  • a second bore is incorporated as a receptacle for a Rast michsvorraum.
  • the second bore forms a bore system with the first bore, in which the first bore and the second bore cross each other.
  • the second bore may open into the first bore.
  • a detent device can be inserted into the second bore in a particularly advantageous manner and held in place with a fastening pin, which is inserted within the first bore.
  • the mounting pin may be inserted on one side of the first bore while the switch is inserted on the other side of the first bore.
  • the fastening pin can be pushed out, wherein the
  • a further advantageous embodiment of the method provides that the first passage and the second passage are adapted to the internal combustion engine as a function of at least one operating parameter, preferably an engine oil pressure.
  • the connecting rod described above can be manufactured as a so-called base connecting rod for various internal combustion engines, in which depending on the predetermined engine oil pressure in operation of each different internal combustion engines, a different switch, each with a different first and / or second cross-sectional area of the first and / or second passage becomes.
  • the inventive method therefore simplifies the production of a larger number of different connecting rods, preferably of at least 100 connecting rods of a first type and at least 100 further connecting rods of a second type, wherein the first connecting rod of the second connecting rod by a differently shaped switch, each with different first and / or second passage.
  • FIG. 1 shows a sectional view of an internal combustion engine with an adjustable variable compression ratio
  • FIG. 2 shows a connecting rod with an adjustable effective length
  • FIG. 3 is a sectional view of the connecting rod of Fig. 2,
  • FIG. 6 is a perspective view taken on the line II - II in FIG.
  • Fig. 7 is a perspective view of the through the section line III-III in
  • FIG. 3 cut connecting rod
  • Fig. 8 shows a latching head in a perspective view
  • FIG. 9 shows a coil spring, a latching head, the switch of FIG. 4 in one
  • FIG. 10 is a sectional view of a connecting rod body with supported by this
  • FIG. 11 is an enlarged view of the area XI of FIG. 10, Fig. 12 shows the hydraulic circuit for adjusting the effective length of
  • FIG. 13 is a sectional view along the line XIII-XIII through the lower part of the connecting rod body, in which the switching element is arranged, but without showing this in section,
  • FIG. 17 is a further enlarged view of the receiving space with switching element in Pleuel Sciences in section
  • 18 is a bottom view of the connecting rod body with representation of the switching element in its first end position
  • FIGS. 19 and 20 are further enlarged views of the receiving space with switching element in Pleuel Sciences in section.
  • FIGS. 22 and 23 are identical to FIGS. 22 and 23.
  • Fig. 1 shows an internal combustion engine 1 with an adjustable compression ratio
  • the u. a.mit a connecting rod 2 is provided, which has an adjusting mechanism 3 for adjusting the compression ratio.
  • the connecting rod 2 has a first working space 29.1 and a second working space 29.2.
  • Fig. 1 shows a crank pin 4 of a crankshaft of the internal combustion engine 1, wherein the connecting rod 2 is mounted by means of bearings 4.2 in a large connecting rod eye of the connecting rod 2 on the crank pin 4.
  • the crank pin 4 has a fluid channel 4.1 for supplying fluid from the crankshaft to the connecting rod 2 via the crank pin 4 and the bearing shells 4.2.
  • Fig. 2 shows the connecting rod 2, by means of which an adjustable change of a compression ratio in the internal combustion engine 1 is made possible.
  • the connecting rod 2 has a large connecting rod bearing eye 9 and a small connecting rod eye 6.
  • an eccentric element 5 is arranged, which is rotatably mounted.
  • the eccentric 5 has an eccentric to the axis of the small connecting rod bearing eye 6 extending bore 18 for receiving a piston pin.
  • the eccentric 5 has a toothing 19. With this toothing 19, the eccentric element 5 is connected to a lever system 20 which, together with the toothing 19, acts as a support mechanism and preferably also as a reverse rotation lock for the eccentric element 5.
  • the He- The lever system 20 has a first lever 21 and a second lever 22.
  • the two levers 21, 22 are fixedly coupled together.
  • the lever system 20 with the levers 21, 22 is arranged in a recess 23 in the connecting rod 2 at the small connecting rod eye 6.
  • the lever system 20 is axially guided in the recess 23. Furthermore, the lever system 20 connection joints 24. About the connecting joints 24 rods 25 are hinged. In the connecting rod 2 support cylinder bores 26 are preferably arranged. In this can be performed according to a piston 27.1 and a piston 27.2, where the rods 25 are articulated. By means of this arrangement, a respective stroke of the two pistons 27. 1 and 27. 2 is directly related to an angle of rotation of the eccentric element 5. By turning the eccentric element 5, the effective length of the connecting rod 2 can be changed, thereby variably setting the compression ratio of the internal combustion engine 1.
  • the support cylinder bores 26 in the connecting rod 2 are closed by check valves 28 to the large connecting rod eye 9 (second bearing of the connecting rod 2), so that in each case the first working space 29.1 and the second working space 29.2 is limited.
  • the work spaces 29.1 and 29.2 can thus serve as a damping volume as well as a support in the case of the reverse rotation lock.
  • the work spaces 29.1 and 29.2 can thus form support chambers.
  • connecting rod bearing shells 30 are arranged.
  • the connecting rod bearing shells 30 are provided with openings 31. Since the bearing shells 30 are provided with a circumferential groove which is in communication with a fluid supply via the crankshaft, a fluid pressure is present in the groove at any time. This fluid pressure is transmitted to the check valves 28 at all times. These open or are respectively closed depending on the working pressure present in the first working space 29.1 or the second working space 29.2.
  • FIG. 3 shows a sectional view along the connecting rod 2 represented by the section line IV-IV in FIG. 2.
  • FIG. 3 shows, in addition to the first working space 29.1 and the second working space 29.2 also has a first hydraulic line 34.1 and a second hydraulic line 34.2.
  • the hydraulic lines 34.1 and 34.2 are connected in fluid-conducting manner via connection channels 35 in each case to the first working space 29.1 and the second working space 29.2.
  • FIG. 4 shows a switch 41 which has a first inlet 42 and a second inlet 43 and a drain 44.
  • the first inlet 42 has a first passage 45
  • the second inlet 43 has a second passage 46.
  • the switch 41 has a sealing surface 47, which delimits the first inlet 42 from the second inlet 43.
  • FIG. 5 shows a perspective view of the connecting rod 2 cut through the section line I-I in FIG. 3.
  • FIG. 5 also shows the first hydraulic line 34.1, which extends from a connecting rod 51 of the connecting rod 2, which is shown in FIG. 1, towards a connecting rod bearing cap 52 of the connecting rod 2 is formed.
  • Fig. 5 shows the switch 41 in a first position, in which the switch 41 connects the first hydraulic line 34.1 via the first inlet 42 with the first passage 45 and the outlet 44 in a fluid-conducting manner with a hydraulic outlet of the connecting rod 2.
  • the hydraulic drain can be formed by the outlet 44 of the switch 41.
  • FIG. 6 shows a perspective view of the section line II-II in Fig. 3 cut connecting rod 2.
  • Fig. 6 also shows the second hydraulic line 34.2, which, starting from a connecting rod 51 of the connecting rod 2 towards a connecting rod bearing cap 52 of the connecting rod 2 trains.
  • FIG. 6 shows the switch 41 in a second position in which the switch 41 connects the second hydraulic line 34. 2 via the second inlet 43 to the passage 46 and the drain 44 in a fluid-conducting manner to a hydraulic outlet of the connecting rod 2.
  • the switch 41 is preferably switchable via an actuating element 49, as shown schematically in FIG. 1, from the first position to the second position and vice versa.
  • the actuating element 49 can be designed, for example, as a U-shaped cam disk element, as described in WO-A-2014/019684 and WO-A-2014/019683.
  • the switch 41 is moved by means of the actuating element 49 into the second position, as shown in FIG. In those engine phases in which compressive forces load on the connecting rod 2, a pressure builds up in the second working space 29.2. The switch 41 releases the second hydraulic line 34.2 in the second position. As a result, the fluid located in the second working space 29.2 can be displaced. At the same time, fresh fluid is sucked into the first working space 29.1. The eccentric 5 can thus in the direction of arrow 37 in FIG. 2 twist.
  • a reverse rotation of the eccentric 5 opposite to the arrow 37 can be initiated by a state in which the switch 41 is in the first position, as shown in Fig. 5.
  • the hydraulic resistance is preferably formed through the second passage 46 and, when set counter to a high compression ratio, through the first passage 45.
  • the switch 41 is an adjustment of the internal combustion engine to the first compression ratio and in the second position of the switch 41, an adjustment of the internal combustion engine to the second compression ratio provided.
  • the switch can also have a third position, in which the first hydraulic line 34.1 and the second hydraulic line 34.2 are closed by means of the switch 41, ie. are not fluidly connected to the drain 44.
  • a compression ratio of the internal combustion engine is preferably adjustable, which is between the first, high, and the second, low compression ratio.
  • FIG. 7 shows a perspective view of the connecting rod 2 cut along the section line III-III from FIG. 2.
  • FIG. 7 also shows the first hydraulic line 34.1 and the second hydraulic line 34.2, which extend from the connecting rod end to the connecting rod bearing cover.
  • a latching mechanism 61 is shown in Fig. 7.
  • the latching mechanism 61 has a coil spring 62, a rounded latching head 63 which is pressed against the switch 41 by means of the coil spring 62.
  • the switch 41 has a fixing element 64, which is arranged on the switch 41.
  • the fixing element 64 is in this embodiment as a multi-rounded surface which bulges for fixing the locking head 63 in the first or second position of the switch 41 respectively in the direction of the interior of the switch 41.
  • the fixing element 64 has, as shown in Fig. 4, a first detent recess 65 for fixing the switch 41 in the first position by means of the locking head 63 and a second detent recess 66 for fixing the switch 41 by means of the locking head 63 in the second position.
  • the connecting rod bearing cover 52 a fluid passage 67 which connects a space 68 bounded by the coil spring 62 and the catch head 63 to a fluid film 69 formed between the large connecting rod eye 9 and the connecting rod bearing shells 30.
  • a permanent fluid pressure can rest on the latching head 63. This fluid pressure may assist a force of the coil spring 62 urging the latching head 63 onto the fixation member 64.
  • FIG. 7 further shows how a first fluid passage 70 and a second fluid passage 71 of the switch 41 are fluid-conductively connected to the drain 44. Furthermore, the second passage 46 of the switch 41 is shown in FIG.
  • the connecting rod bearing cap 52 has a stop 73, which prevents slippage of the switch 41 by the connecting rod bearing cap 52 when switching from the first position to the second position and vice versa.
  • Fig. 8 shows the locking head 63 in a perspective view.
  • Fig. 9 shows the coil spring 62, the latching head 63, the switch 41 and the stopper 73 in a sectional view.
  • the first inlet 42 by means of which the fluid is supplied from the first hydraulic line 34.1 to the switch 41.
  • the fluid flows, provided that the switch 41 is in the first position, through the first passage 45 of the first inlet 42.
  • the first passage 45 is formed as a bore within the first inlet 42.
  • the first inlet 42 may have a first surface 48 sunk into the switch 41.
  • the surface 48 may be particularly advantageous angular, for example, as six, eight, ten or twelve-edged surface executed.
  • the surface 48 may also have a circular boundary.
  • the lowered surface 48 within the first inlet 42 may advantageously accommodate a drilling device for drilling the first passage 45, which facilitates fabrication of the first passage 45.
  • the second inlet 43 may be formed.
  • the switch 41 is made in one piece, ie. made for example from one piece.
  • An integrally executed switch 41 may be cast, for example.
  • the integrally formed switch 41 may be milled, rotated and / or drilled from a piece of metal.
  • FIG. 4 further shows how the first fluid passage 70 and the second fluid passage 71 pass into the drain 44.
  • provision can be made for fluid to flow from the large connecting-rod bearing eye via the latching mechanism 61 through the outlet 44.
  • Such a flow can advantageously a negative pressure at the first passage 45 or the second passage 46 and also at the first inlet 42 and the second inlet 43, depending on whether the switch 41 in the first position or in the second Stel - ment, effect.
  • This negative pressure can in particular accelerate an outflow from the first hydraulic line 34.1 or the second hydraulic line 34.2 and thus also an outflow of the fluid from the first working space 29.1 or 29.2.
  • Such an accelerated outflow of the fluid from the hydraulic lines 34 and the working spaces 29 can accelerate an adjustment of the adjusting mechanism 3, ie in particular the number of required working cycles of the internal combustion engine 1 for switching the adjusting mechanism from the first to the second position, ie from a first compression ratio towards a second compression ratio, and vice versa.
  • the flow can be particularly advantageous by the centrifugal forces, which at the lower end of the connecting rod 2, d. H. on the connecting rod bearing cap 52, act, be reinforced.
  • a reciprocating piston engine 110 which is exemplified as a reciprocating internal combustion engine 110, in which the compression ratio is variable, in two stages, wherein it should be noted that the invention is not limited to the number of adjustable compression ratios is. Furthermore, the invention is not limited to internal combustion engines, but also includes, inter alia, compressors, pumps or the like. in the form of reciprocating engines.
  • the internal combustion engine 110 has a housing 112, in which at least one cylinder 114 is formed. In cylinder 114, a compressor moves tion piston 116 which is mounted on a connecting rod 118 with connecting rod body 119.
  • the compression piston 116 is the combustion chamber into which an inlet channel and an outlet channel open (not shown in FIG. 1).
  • the connecting rod 118 drives a crankshaft in a known manner.
  • This crankshaft has counterweights (both not shown) with crank pins 130, on which the individual connecting rods 118 are mounted.
  • the Kurbelwellenpleuellager 132 is acted upon in a known manner with pressurized engine oil and has a lubricant path 133.
  • the corresponding lubricant system has a pump that draws engine oil from the oil sump of the housing (not shown). In addition to lubrication, the engine oil also serves to cool, for example, the bearings of the internal combustion engine 110.
  • FIG. 10 is located at the upper end of the connecting rod 118, d. H. on its compression piston bearing 134 a (eg eccentric (adjusting element 138) in the form of an adjusting lever 139 which is pivotally mounted on the connecting rod 118. Eccentric to the pivot point 140 of the adjusting element 138, the pin 142 is mounted, which carries the compression piston 116. Der Center of the pin 142 is shown at 144.
  • the adjusting lever 139 has a first end 146 and a second end 148 remote therefrom, on each of which piston rods 150, 152 are articulated.
  • the piston rods 150, 152 are part of two cylinder / piston support units 154, 156, of which the first support unit 154 has a first support cylinder 158 formed in the connecting rod 118 with a first support piston 160 displaceably guided therein, while the second support unit 156 has a second support cylinder 162 having guided in this second support piston 164.
  • These two support units 154, 156 serve to lock the adjusting element 138 in its two
  • a hydraulic channel 174 or 176 opens into each of the two working chambers 170, 172.
  • a hydraulic circuit 180 with, for example, throttles or orifices 182, 184, check valves 186, 188 and a switching element 190, the two working chambers 170, 172 are interconnected, so that the desired adjustment of the compression ratio from a high to a low value or can be reversed.
  • the hydraulic circuit is connected via the hydraulic drainage channel 192 to the connecting rod bearing 132 and thus to the lubricant path 133 of the connecting rod bearing 132.
  • the hydraulic circuit is ultimately supplied with engine oil.
  • the switching element 190 is a 2/3-way valve, ie a valve which can assume two switching positions and has three connections. The three connections are connected to each other in the two switch positions in different ways or blocked with each other.
  • the actuation of the switching element 190 takes place, for example, mechanically, electrically, magnetically or hydraulically, and indeed whenever the compression ratio is to be changed from one value to the other value.
  • the constructive solution for adjusting the switching element 190 is not the subject of the invention and should therefore not be further described here. Examples of related constructions are described in WO-A-2014/019683 and WO-A-2014/019684.
  • the peculiarity of the connecting rod 118 is that the hydraulic fluid flows through the switching element 190, corresponding to the hydraulic fluid flows through the hydraulic circuit 180 according to FIG. 12.
  • the two hydraulic channels 174, 176 are formed in the connecting rod body 119, which open at the lower end of the connecting rod body 119 into a receiving space 193 which, as a cylindrical bore, extends transversely through the connecting rod body 119 is formed extending.
  • the switching element 190 is guided displaceably.
  • the outer side 194 of the switching element 190 is fluid-tight against the inside 196 of the receiving space 193.
  • connection channels 200, 202 are the check valves 186, 188 of the hydraulic circuit 180 (see FIG. 12).
  • the switching element 190 now has the task, depending on its movement position (first or second end position) either to connect the first hydraulic channel 174 to the hydraulic outlet channel 198 and to block the second hydraulic channel 176 or to supply the second hydraulic channel 176 to the hydraulic outlet channel 198 connect and block the first hydraulic channel 174.
  • the switching element 190 is provided with a first and a second inlet bore and at least one outlet bore, which is described below with reference to FIGS. 15 to 17 will be explained.
  • the switching element 190 has an internal chamber 204, into which the first and the second inlet bore 206, 208 opens. From the chamber 204 extend in this embodiment, two outlet holes 210, each of which ends in a different of two detent recesses 212, 214.
  • the switching element 190 has, in this embodiment, below the chamber 204, a recess 216 which is open toward the outside 194 of the switching element 190 and in which there is a movement limiting pin 218 which projects beyond the outside 194 of the switching element 190. This movement limiting pin 218 restricts the lateral movement of the switching element 190 in its two end positions and is arranged in a groove or recess 220 at the lower end of the connecting rod body 119 (see also FIGS. 18 to 23).
  • a latching mechanism 222 ensures the locking of the switching element 190 in the respective end position.
  • a locking element 224 with a spherical front side 226, with which the locking element 224 dips into the receiving space 193.
  • a helical spring 228 which bears against the rear side 229 of the detent element 224 and presses it against the outer side 194 of the switching element 190.
  • the latching element 224 dips into one of the two latching recesses 212, 214.
  • the spherical front side 226 of the latching element 224 does not seal off the outlet bore 210 that opens into the relevant latching recess 212, 214, so that a fluid connection exists between the respective outlet bore 210 and the hydraulic outlet channel 198 laterally past the latching element 224.
  • This fluid connection is further assisted or improved by hydraulic bores 230 introduced into the latching element 224, which terminate on the rear side of the latching element 224 in a region which is flush with or surrounded by the inner region of the spiral spring 228.
  • the sealing lengths must be dimensioned accordingly.
  • the sealing lengths describe the length of the fluid passages around the switching element 190 and within the cylindrical receiving space 192 along which fluid can flow from the fluid channels 174, 176.
  • the inlet bores 206, 208 are narrowed, that is, provided in sections with a cross-section of a size that ensures compliance with the maximum allowable flow rate of fluid through the hydraulic circuit 180, depending on, through which of the two inlet bores 206, 208 in response to the position of the switching element 190 fluid flows.
  • the switching element 190 not only fulfills the function of an element designed as a two / three-way valve in this embodiment, but also takes over the functions of the two orifices 182, 184 and the passage of fluid in the hydraulic circuit 180 to the crankshaft splitter 132.
  • FIGS. 10 to 23 two variants of the design of a switch or a switching element are shown and disclosed in the associated figure description parts, which are flowed through by fluid of the hydraulic circuit and are provided with diaphragm functions.
  • the sealing effect through the interaction of the outside of the switch / switching element with the inside of the opening or the receiving space in the connecting rod, into or into which the switch or the switching element is inserted.
  • the fluid passes out of the drain 44, which is open towards the outside of the switch and into which the movement limiting pin projects (see stop 73 in FIG. 7), which limits the switch movement in the two end positions.
  • the switching element 190 of the connecting rod according to FIGS. 10 to 23 the movement limiting pin 218, which dips accordingly into the groove 220 formed in the connecting rod.
  • the drain of the fluid from the switching element 190 away z. B. also take place via an (axial) bore of the movement limiting pin 218; This hole then forms the hydraulic drainage channel.
  • the peculiarities of the locking mechanism for the switching element 190 of the connecting rod according to FIGS. 10 to 23, in particular the hydraulic holes in the locking element can also be used in the locking mechanism of the connecting rod according to FIGS. 1 to 9 realize.
  • the invention can also be described alternatively by one of the following feature groups, wherein the feature groups can be combined with one another as desired and also individual features of a feature group can be combined with one or more features of one or more other feature groups and / or one or more of the previously described embodiments are.
  • Internal combustion engine 1 with an adjustable variable compression ratio and a connecting rod 2 comprising an adjusting mechanism 3 for adjusting the adjustable variable compression ratio, with a first hydraulic line 34.1, a second hydraulic line 34.2, with a hydraulic drain and a switch 41 for switching the adjusting mechanism 3, wherein the switch 41 is arranged on the connecting rod 2 and a first inlet 42, a second inlet 43 and a drain 44 and in a first position of the switch 41, the first hydraulic line 34.1 is fluidly connected to the hydraulic drain via the first inlet and the drain and a fluid connection between the second hydraulic line 34.2 and the hydraulic flow is interrupted and in a second position of the switch, the second hydraulic line 34.2 with the hydraulic flow via the second inlet 43 and the drain 44 is fluidly connected and a fluid connection between d the first hydraulic line 34.1 and the hydraulic sequence is interrupted, characterized in that the switch 41 has a sealing surface 47 and the first inlet 42 a first passage 45 and the second inlet 43 has a second passage 46, wherein the sealing surface 47, the first inlet 42 of
  • the switch 41 has a fixing element 64 for fixing the switch 41 in the first position and preferably in the second position.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

L'invention concerne un moteur à combustion interne (1) pourvu d'un taux de compression variable réglable et d'une bielle (2) équipée d'un mécanisme de réglage (3) destiné à régler le taux de compression variable réglable, d'un premier conduit hydraulique (34.1), d'un second conduit hydraulique (34.2), d'une sortie hydraulique et d'un commutateur (41) destiné à commuter le mécanisme de réglage (3) ; le commutateur (41) est disposé sur la bielle (2) et comporte une première entrée (42), une seconde entrée (43) et une sortie (44), et, dans une première position du commutateur (41), le premier conduit hydraulique (34.1) est en communication fluidique avec la sortie hydraulique par le biais de la première entrée et de la sortie et une communication fluidique entre le second conduit hydraulique (34.2) et la sortie hydraulique est interrompue et, dans une seconde position du commutateur, le second conduit hydraulique (34.2) est en communication fluidique avec la sortie hydraulique par le biais de la seconde entrée (43) et de la sortie (44) et une communication fluidique entre le premier conduit hydraulique (34.1) et la sortie hydraulique est interrompue ; le commutateur (41) possède une surface d'étanchéité (47) et la première entrée (42) possède un premier passage (45) et la seconde entrée (43) possède un second passage (46) ; la surface d'étanchéité (47) sépare la première entrée (42) de la seconde entrée (43) et le commutateur (41) et la bielle (2) sont mobiles l'une par rapport à l'autre et le premier passage (45) et le second passage (46) se déplace conjointement avec le commutateur (41), lors de la commutation, de la première position à la seconde position et vice versa.
PCT/EP2015/077953 2014-11-27 2015-11-27 Moteur à combustion interne à taux de compression réglable et bielle pour un tel moteur à combustion interne WO2016083592A1 (fr)

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DE102017116014A1 (de) 2016-07-29 2017-08-31 FEV Europe GmbH Hubkolbenmaschine mit einstellbarem Verdichtungsverhältnis, insbesondere Hubkolbenbrennkraftmaschine, und Pleuel für eine derartige Hubkolbenmaschine
WO2018007534A1 (fr) * 2016-07-06 2018-01-11 Avl List Gmbh Bielle à longueur réglable et à actionnement mécanique
DE102016008306A1 (de) * 2016-07-06 2018-01-11 Avl List Gmbh Pleuel mit verstellbarer Pleuellänge
CN107882633A (zh) * 2016-09-30 2018-04-06 伊希欧1控股有限公司 可变压缩比内燃机的连杆的液压转换阀的液压装置及连杆
EP3301275A3 (fr) * 2016-09-30 2018-04-11 ECO Holding 1 GmbH Système hydraulique pourvu de coupleur inverseur permettant la commande d'un courant liquide hydraulique d'une bielle pour un moteur à combustion interne à capacité variable ainsi que bielle
AT519140A1 (de) * 2016-09-30 2018-04-15 Avl List Gmbh Längenverstellbares Pleuel mit mechanischer Verstellung
DE102016211322B4 (de) 2016-06-24 2019-10-02 Schaeffler Technologies AG & Co. KG Anordnung eines Umschaltelements in einem Pleuel einer Hubkolbenbrennkraftmaschine
EP3404232B1 (fr) 2017-05-15 2019-11-13 ECO Holding 1 GmbH Bielle pour un moteur à combustion interne à compression variable
US10669930B2 (en) 2015-08-10 2020-06-02 Avl List Gmbh Reciprocating piston machine comprising a length adjustable connecting rod and an inductively actuatable control valve
US10876474B2 (en) 2016-05-31 2020-12-29 Avl List Gmbh Length-adjustable connecting rod, device for setting a compression ratio and internal combustion engine
US10954849B2 (en) 2015-12-14 2021-03-23 Avl List Gmbh Length-adjustable connecting rod with electromagnetically-actuatable switching valve
US11066987B2 (en) 2017-02-24 2021-07-20 Avl List Gmbh Method for operating a reciprocating piston machine having at least one piston rod that is hydraulically adjustable in length

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DE102010016037A1 (de) * 2010-03-19 2011-09-22 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Umschaltventil und Verbrennungsmotor mit einem derartigen Umschaltventil
DE102010061363A1 (de) * 2010-12-20 2012-06-21 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Umschaltventil und Verbrennungsmotor mit einem derartigen Umschaltventil sowie Verfahren zur Steuerung des Umschaltventils
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Cited By (18)

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Publication number Priority date Publication date Assignee Title
US10669930B2 (en) 2015-08-10 2020-06-02 Avl List Gmbh Reciprocating piston machine comprising a length adjustable connecting rod and an inductively actuatable control valve
US10954849B2 (en) 2015-12-14 2021-03-23 Avl List Gmbh Length-adjustable connecting rod with electromagnetically-actuatable switching valve
US11199130B2 (en) 2016-05-31 2021-12-14 Avl List Gmbh Length-adjustable piston rod with a control device that can be hydraulically actuated and a switching valve that can be electromagnetically actuated, a reciprocating piston engine and a vehicle
US10876474B2 (en) 2016-05-31 2020-12-29 Avl List Gmbh Length-adjustable connecting rod, device for setting a compression ratio and internal combustion engine
DE102016211322B4 (de) 2016-06-24 2019-10-02 Schaeffler Technologies AG & Co. KG Anordnung eines Umschaltelements in einem Pleuel einer Hubkolbenbrennkraftmaschine
WO2018007534A1 (fr) * 2016-07-06 2018-01-11 Avl List Gmbh Bielle à longueur réglable et à actionnement mécanique
DE102016008306A1 (de) * 2016-07-06 2018-01-11 Avl List Gmbh Pleuel mit verstellbarer Pleuellänge
AT518848A1 (de) * 2016-07-06 2018-01-15 Avl List Gmbh Pleuel mit verstellbarer Pleuellänge mit mechanischer Betätigung
AT518848B1 (de) * 2016-07-06 2018-10-15 Avl List Gmbh Pleuel mit verstellbarer Pleuellänge mit mechanischer Betätigung
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DE102017116014A1 (de) 2016-07-29 2017-08-31 FEV Europe GmbH Hubkolbenmaschine mit einstellbarem Verdichtungsverhältnis, insbesondere Hubkolbenbrennkraftmaschine, und Pleuel für eine derartige Hubkolbenmaschine
CN107882633A (zh) * 2016-09-30 2018-04-06 伊希欧1控股有限公司 可变压缩比内燃机的连杆的液压转换阀的液压装置及连杆
US10330005B2 (en) 2016-09-30 2019-06-25 ECO Holding 1 GmbH Hydraulic arrangement with a switch valve for controlling a hydraulic fluid flow of a connecting rod for an internal combustion engine with variable compression and connecting rod
AT519140B1 (de) * 2016-09-30 2018-11-15 Avl List Gmbh Längenverstellbares Pleuel mit mechanischer Verstellung
AT519140A1 (de) * 2016-09-30 2018-04-15 Avl List Gmbh Längenverstellbares Pleuel mit mechanischer Verstellung
EP3301275A3 (fr) * 2016-09-30 2018-04-11 ECO Holding 1 GmbH Système hydraulique pourvu de coupleur inverseur permettant la commande d'un courant liquide hydraulique d'une bielle pour un moteur à combustion interne à capacité variable ainsi que bielle
US11066987B2 (en) 2017-02-24 2021-07-20 Avl List Gmbh Method for operating a reciprocating piston machine having at least one piston rod that is hydraulically adjustable in length
EP3404232B1 (fr) 2017-05-15 2019-11-13 ECO Holding 1 GmbH Bielle pour un moteur à combustion interne à compression variable

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