WO2018019514A1 - Bielle pour un moteur à combustion interne à compression variable - Google Patents

Bielle pour un moteur à combustion interne à compression variable Download PDF

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Publication number
WO2018019514A1
WO2018019514A1 PCT/EP2017/066299 EP2017066299W WO2018019514A1 WO 2018019514 A1 WO2018019514 A1 WO 2018019514A1 EP 2017066299 W EP2017066299 W EP 2017066299W WO 2018019514 A1 WO2018019514 A1 WO 2018019514A1
Authority
WO
WIPO (PCT)
Prior art keywords
connecting rod
rotor
eccentric
hydraulic fluid
stator
Prior art date
Application number
PCT/EP2017/066299
Other languages
German (de)
English (en)
Inventor
David Huber
Dietmar Schulze
Original Assignee
ECO Holding 1 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 ECO Holding 1 GmbH filed Critical ECO Holding 1 GmbH
Publication of WO2018019514A1 publication Critical patent/WO2018019514A1/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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D15/00—Varying compression ratio
    • F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/06—Lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways, e.g. bores
    • F01M2001/066—Connecting rod with passageways

Definitions

  • the invention relates to a connecting rod for an internal combustion engine with variable compression, in particular a motor vehicle, with an eccentric adjusting device for adjusting an effective connecting rod length, and an internal combustion engine with variable compression with a connecting rod.
  • 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 low cylinder filling, the compression ratio with higher values are selected without a "knocking" would occur.
  • 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 are known, which operate with the aid of hydraulic switching valves an eccentric adjusting device of a connecting rod.
  • a generic connecting rod is known for example from WO 2013/092364, which discloses a length-adjustable connecting rod for a reciprocating engine, in particular an internal combustion engine, with at least a first and a second rod part, which two rod parts telescopically zoom in and / or into each other.
  • the second rod part forms a guide cylinder and the first rod part a longitudinally displaceable in the guide cylinder piston member.
  • a high-pressure chamber is spanned, in which at least one first oil passage opens, in which at least one valve designed as a control valve is arranged, the actuator by a return spring in a first position and by oil pressure against the force of the return spring in a second position is displaced.
  • WO 2010/108582 A1 discloses a connecting rod, in which an actuating device is arranged in the upper connecting rod eye.
  • the actuator may also be placed on a central rod of the connecting rod and form the first connecting rod as the first connecting rod.
  • the lower connecting rod eye is formed with the center rod of the connecting rod as a second connecting rod element.
  • the connecting rod eye is the part of the connecting rod in which the piston pin is mounted.
  • the actuating device comprises an eccentric, which carries the piston pin and is pivotally mounted in the upper connecting rod eye.
  • the actuating device also comprises an actuating element, which can cause a pivoting of the eccentric about the central axis of the upper connecting rod eye.
  • the piston pin is arranged eccentrically on the eccentric, and a pivoting of the eccentric about the central axis of the upper connecting rod causes a displacement of the piston pin along a circular path about this axis.
  • the actuating element is designed as a swivel motor.
  • An object of the invention is to provide an improved connecting rod for a variable compression internal combustion engine with a robust and reliable adjustment mechanism having low space requirements.
  • Another object is to provide an internal combustion engine with such a connecting rod.
  • a connecting rod for an internal combustion engine with variable compression which comprises a Pleuel Sciences, a displaceably guided in a longitudinal direction of the connecting rod connecting rod with a connecting rod, a connecting rod cover, and an eccentric adjusting device for adjusting an effective connecting rod length.
  • the eccentric adjusting device is arranged in the connecting rod body and has an eccentric cooperating with at least one lever.
  • An adjustment of the eccentric adjusting device is adjustable by means of a switching valve, wherein the eccentric is pivotable about its axis of rotation, and wherein the at least one lever is pivotally connected to the connecting rod.
  • the connecting rod according to the invention has the advantage that it allows the adjustment of the effective connecting rod length in a very compact design.
  • the distance between the center axis of a lifting bearing eye arranged in the connecting rod (large connecting rod eye as the first joint) to the central axis of a small connecting-rod eye, which constitutes the second joint, and which forms a receptacle for a piston pin is referred to as the effective connecting-rod length.
  • the connecting rod according to the invention allows the adjustment via a third joint in Pleuel emotions, which is connected to a telescopic rod, the connecting rod.
  • the small connecting rod eye is arranged in the connecting rod, which is displaceable in the form of an extendable telescopic rod in the longitudinal direction of the connecting rod.
  • the effective Pleuelin can be changed by moving the connecting rod relative to the Pleuel Sciences with the Bublagerauge.
  • the displacement of the connecting rod takes place here by means of an eccentric adjusting device with an eccentric, which is connected via at least one lever to the connecting rod, so that an adjustment of the eccentric leads to a longitudinal displacement of the connecting rod.
  • the connecting rod can be connected via two levers with the eccentric, which are arranged on both flat sides of the connecting rod, so as to ensure a symmetrical introduction of force between the connecting rod and eccentric.
  • the levers may be connected to the connecting rod by means of a bolt guided in a bore. By introducing a torque on the eccentric can be changed so the effective connecting rod length.
  • the eccentric adjusting device can be hydraulically actuated, for example, wherein the hydraulic fluid can be controlled via a switching valve.
  • the connecting rod has the advantage that the interfaces to an internal combustion engine are maintained, so that a conventional connecting rod for variable compression can be exchanged for the connecting rod according to the invention.
  • the connecting rod body is easy to manufacture, since no complicated to be machined hydraulic support chambers are provided.
  • the connecting rod assembly has a low total weight and consists of few individual components and assembly steps.
  • the connecting rod is well suited for mass production.
  • the use of non-cranked levers facilitates the production and is also advantageously feasible in favorable serial production, for example by laser cutting. Drilling, which could weaken the structure of the connecting rod, accounts for the most part.
  • the eccentric adjusting device may comprise a pivoting motor which has a rotor mounted in a stator. At least one first support chamber and at least one second support chamber are formed between at least one rotor blade of the rotor and at least one stator blade, wherein a volume of the first support chamber and a volume of the second support chamber can be changed by an adjustment of rotor against stator complementary to each other.
  • the connecting rod can thus have a swivel motor in combination with an eccentric adjusting device for adjusting the effective connecting rod length.
  • a hydraulic swing motor as used for example in camshaft adjusters, in conjunction with an eccentric bore in the rotor of the swing motor favors a very compact design of a length-adjustable connecting rod.
  • the sealing of the support chambers of the slewing motor which are usually operated with a hydraulic fluid under sometimes very high pressures, for example, over 1000 bar, thereby posing a design challenge.
  • the swing motor itself can be arranged directly in the connecting rod body.
  • the swivel motor may advantageously have a rotor with at least one rotor blade and a stator with at least one stator wing.
  • the rotor can be rotated on a common axis against the stator, so that the rotor blade against the Stator wing is twisted.
  • at least one first support chamber and a second support chamber are formed between the rotor wing and the stator wing, the volume of which is variable continuously and complementarily with respect to one another when the rotor rotates against the stator. As the volume of the first support chamber increases, the volume of the second support chamber decreases, and vice versa.
  • four support chambers can be provided in the swivel motor, which are each separated alternately by two rotor blades and two stator blades.
  • the rotor has an eccentric bore, which represents the eccentric and serves as a receptacle for a piston pin.
  • the stator can be used with the rotor disposed therein in the Pleuel Sciences and be arranged against rotation in the Pleuel Sciences.
  • the stator may further comprise two outer circumferential grooves, each having two inlet bores to the support chambers and ensure the connection between the support chambers and the inlet and outlet lines to a hydraulic supply port.
  • the rotor is rotatably mounted in the stator.
  • the introduction of a torque on the rotor can be done so conveniently via the piston pin, which is arranged in the eccentric bore of the rotor.
  • the rotor By introducing the torque via the connecting rod and the lever to the rotor, the rotor can be adjusted via external mass forces and gas forces, thus changing the effective connecting rod length.
  • the torque By the hydraulic oil in the support chambers of the slewing motor, the torque can be supported.
  • the eccentric can be arranged in the rotor of the rotary motor and actuated by the rotor.
  • the eccentric may conveniently be formed as an eccentrically arranged bore in the rotor, so that upon rotation of the rotor about its axis, the eccentric bore is rotated and arranged in the bore receptacle for the at least one lever in this way is eccentrically moved about the axis of the rotor ,
  • swivel angle of the rotor of the swing motor Due to the feasibility of larger swivel angle of the rotor of the swing motor compared to conventional conrod designs for variable compression can be chosen for the same adjustment length of the connecting rod a small eccentricity in the rotor, thereby keeping the maximum occurring pressures in the support chambers low.
  • the swivel angle can be determined by the eccentricity of the bolt in the eccentric of the rotor.
  • the large number of degrees of freedom, such as swivel angle, eccentricity, rotor diameter, number of vanes, to adapt the connecting rod to the internal combustion engine allows more detailed individual adjustments compared to conventional systems.
  • the swivel motor for the eccentric adjusting device support piston and eccentric lever can be avoided in the connecting rod, since the support chambers are arranged in the pivot motor as a separate unit.
  • the levers for adjusting the connecting rod are moved substantially in the longitudinal direction of the connecting rod, so that the entire connecting rod occupies a very compact space.
  • connecting rod is to replace the swivel motor system by an eccentric and intercept the eccentric torque via a further pair of levers in a linear movement.
  • the linear movement allows the use of a double acting support piston or two separate support pistons.
  • the necessary piston guide can be accommodated in the connecting rod body.
  • the advantage lies in the additional use of an eccentric, which conducts most of the load in the Pleuel Sciences and only supports the adjusting torque of the eccentric via a hydraulic fluid column. This results in much lower pressures in the support chambers.
  • At least one hydraulic fluid line for supplying hydraulic fluid into the first support chamber of the swing motor and at least one hydraulic fluid line for supplying hydraulic fluid into the second support chamber of the swing motor may be provided in the connecting rod body.
  • the hydraulic fluid lines can be arranged space-saving in the connecting rod body, so as to guide the hydraulic fluid between the switching valve and the support chambers of the slewing motor.
  • the rotor can be advantageously controlled in order to support the mass forces and gas forces which act on the eccentric adjusting device and thus to carry out the length adjustment of the connecting rod. Due to the low required number of hydraulic fluid lines can make a production of the connecting rod low.
  • the at least one rotor blade can be fastened to the rotor.
  • the rotor can comprise several individual parts.
  • the rotor blades may be screwed or pressed. Such a rotor can be manufactured inexpensively.
  • the stator may be sealed against each other by at least one sealing strip arranged on a running surface of the rotor and / or a running surface of the stator.
  • sealing strips seal the support chambers from each other.
  • the sealing strips can also be biased by spring element.
  • the stator sealing strips are also arranged, which ensure a further sealing of the support chambers against each other in a component-related relative movement of the rotor.
  • the first and / or the second support chamber may be sealed against an environment by at least one sealing element arranged at least partially on an outer circumference of the rotor and / or an inner circumference of the stator.
  • the sealing of the support chambers of the slewing motor against each other and against the environment is advantageously carried out via an annular seal, which is made possible by the structural design of the stator and rotor, which are inserted into one another via a round outer contour.
  • the total length of the rotor is favorably greater than the length of the centrally arranged rotor blades in order to realize a sealing distance for the swivel motor.
  • annular sealing element for example in the form of piston rings, is placed in each of the outwardly extending sealing sections.
  • spherical sealing surfaces and an overlapping annular joint are advantageous to the outside.
  • a contact force on the spherical outer shape of the prestressed piston rings is exerted on the stator.
  • An additional sealing contact force can be exerted both axially and radially on the piston ring via the hydraulic pressure.
  • the use of different types of piston rings and other annular sealing elements is possible.
  • the stator may have on an outer circumference at least two circumferential grooves for supplying the first and the second support chamber with hydraulic fluid.
  • the stator may thus have at least two outer circumferential grooves, each having two inlet bores to the support chambers and ensure the connection between the support chambers and the inlet and outlet lines to a hydraulic supply port.
  • the swivel motor can be conveniently supplied with hydraulic fluid.
  • at least one check valve can be provided in the hydraulic fluid line between the first support chamber and a supply connection and / or at least one check valve in the hydraulic fluid line between the second support chamber and the supply connection. In this way it can be prevented that hydraulic fluid from the support chambers unintentionally flows into the supply port and lose the support chambers to hydraulic pressure.
  • the switching valve and the check valves may be arranged in the connecting rod cover.
  • a particularly space-saving arrangement provides for the inclusion of reversing valve and check valves in the connecting rod cover. Hydraulic tests of the components are so easy to perform on the connecting rod cover. In addition, defective components can be easily replaced by replacing the connecting rod cap.
  • the production of the connecting rod body is advantageously simplified in this way and there is no ⁇ lmakerssnut in the upper part of the large Pleuellagerauges necessary, whereby the bearing shell is less loaded due to the larger area.
  • a groove for supplying the changeover valve with hydraulic fluid from the supply connection may be provided on a circumference of a Hublagerauges arranged at least partially in the connecting rod cover at least in the region of the connecting rod cover.
  • the groove can ensure a reliable supply of the changeover valve and thus the swivel motor with hydraulic fluid.
  • Mass forces and gas forces are used for the actual adjustment of the eccentric adjusting device to a change in the effective connecting rod length. In this way, the adjustment can be conveniently achieved with the least possible expenditure of energy.
  • the eccentric adjusting device which may preferably have the swivel motor, the inertial forces and gas forces are supported in order to achieve a defined mode of operation with a specific connecting rod length.
  • the higher mass of the eccentric adjusting device allows easier adjustment at lower speeds and a larger pivoting range.
  • the lever may be connected to the connecting rod via at least one rotatable pin and / or with the eccentric via at least one rotatable pin.
  • the introduction of a torque on the rotor can be done so conveniently over the bolt, which is arranged in the eccentric bore of the rotor.
  • the rotor By introducing the torque onto the rotor, the rotor can be adjusted via external mass forces and gas forces, thus changing the effective connecting rod length.
  • the torque By hydraulic pressure in the support chambers of the swing motor, the torque can be supported.
  • Figure 1 shows a connecting rod according to the invention in a slightly tilted plan view and partially longitudinal sectional view in a position for low compression.
  • Figure 2 shows the connecting rod of Figure 1 in a slightly tilted plan view and partially longitudinally sectioned view in a position for high compression.
  • FIG. 3 shows the connecting rod from FIG. 1 in a side view for defining sectional planes
  • FIG. 4 shows a first longitudinal section through the connecting rod of Figure 1 in the position for low compression along the line A-A in Fig. 3 ..;
  • FIG. 5 shows a second longitudinal section through the connecting rod of Figure 1 in the position for low compression along the line C-C in Fig. 3 ..;
  • FIG. 6 shows a third longitudinal section through the connecting rod of FIG. 1 in a position for low compression along the line D-D in FIG. 3;
  • Figure 7 is a detail view in longitudinal section through the connecting rod cover with details of the changeover valve and a check valve in the low compression position.
  • Fig. 8 is a detail view in a further longitudinal section through the connecting rod cover
  • FIG. 10 shows a first longitudinal section through the connecting rod from FIG. 1 in the position for high compression along the line AA in FIG. 3;
  • FIG. 10 shows a first longitudinal section through the connecting rod from FIG. 1 in the position for high compression along the line AA in FIG. 3;
  • FIG. 1 1 shows a second longitudinal section through the connecting rod of Figure 1 in the position for high compression along the line C-C in Fig. 3.
  • Fig. 12 is a third longitudinal section through the connecting rod of Fig. 1 in the position for high
  • Fig. 13 is a detail view in longitudinal section through the connecting rod cover with details of the changeover valve and a check valve in the position for high compression;
  • Fig. 14 is a detail view in a further longitudinal section through the connecting rod cover with
  • FIG. 16 is an exploded view of the connecting rod of FIG. 1.
  • the effective connecting rod length 60 (see FIG. 4), which is defined as the distance of the central axis of the lifting bearing eye 38 from the central axis of the small connecting rod eye 18 in the connecting rod 16, can be changed.
  • the eccentric adjusting device 20 is arranged in the connecting rod body 12 and has an eccentric 21 cooperating with the levers 24, 25.
  • Lever 25 is not visible in the illustration in Figure 1, since it is arranged on the back of the connecting rod body 12.
  • the eccentric adjusting device 20 can be driven by inertial forces and gas forces of an internal combustion engine, wherein an adjustment of the eccentric adjusting device 20 is hydraulically adjustable by means of a switching valve 32 by a position of the eccentric adjusting device 20 can be locked by the hydraulic fluid.
  • the eccentric 21 itself is pivotable about its axis of rotation.
  • the levers 24, 25 are pivotally connected to the connecting rod 16 via the bolt 31, so that via an adjustment of the eccentric 21, the connecting rod 16 are moved in their leadership in Pleuel stresses 12 and thus the effective connecting rod 60 can be changed.
  • the switching valve 32 and two check valves 64, 66 are arranged for controlling a hydraulic fluid flow.
  • Figure 2 shows the connecting rod 10 of Figure 1 in plan view and partially longitudinally sectioned view in a position for high compression. In this position, the connecting rod 16 is maximally pushed out of the connecting rod body 12, so that the connecting rod 16 is in the upper position and the effective connecting rod length 60 is maximum.
  • FIGS. 4 to 6 show different sections of the connecting rod 10 in a position for low compression.
  • FIG. 4 shows a first longitudinal section through the connecting rod 10 from FIG. 1 in the position for low compression along the line AA in FIG. 3.
  • the eccentric adjusting device 20 of the illustrated embodiment of a connecting rod 10 according to the invention comprises a pivoting motor 26, which has one in a stator 28 mounted rotor 27 has. Details about the pivoting motor 26 can be seen in FIG.
  • the eccentric 21 is disposed in the rotor 27 of the swing motor 26 and actuated by the rotor 27.
  • a hydraulic fluid passage 70 for supplying hydraulic fluid into the first support chamber 52 of the swing motor 26 and a hydraulic fluid passage 72 for supplying hydraulic fluid into the second support chamber 54 of the swing motor 26 are provided.
  • the hydraulic fluid lines 70, 72 can be seen partially cut in FIGS. 5 and 6.
  • a check valve 64 is provided in the hydraulic fluid passage 70 between the first support chamber 52 and a supply port
  • a check valve 66 is provided in the hydraulic fluid passage 72 between the second support chamber 54 and the supply port.
  • the switching valve 32 and the check valves 64, 66 are arranged in the connecting rod cover 14 in the area between the connecting rod 22.
  • a groove 68 is provided for supplying the switching valve 32 with hydraulic fluid from the supply port in the region of the connecting rod cover 14.
  • FIG 5 and Figure 6 are further longitudinal sections through the connecting rod 10 of Figure 1 in the position for low compression along the line C-C, and along the line D-D shown in Figure 3.
  • the hydraulic fluid lines 70 and 72 are partially cut to recognize.
  • the switching valve 32 is shown with the slide 78, which is displaceable perpendicular to the plane and can be held in a position by means of a latchable, not shown, latching element.
  • the locking element is pressed by the compression spring 44, which is shown partially cut against locking positions in the slide.
  • the slide flow holes are arranged, of which a flow hole 76 can be seen in Figure 8, which serve to distribute the hydraulic fluid to different hydraulic fluid lines.
  • the spool 78 In the low-compression position, the spool 78 is such that the hydraulic fluid passage 72, which is the so-called gas power passage, is directly connected to the supply port of the hydraulic fluid and the hydraulic fluid passage 70, which is the so-called mass passage, is closed.
  • These hydraulic fluid lines 70, 72 are provided with a throttled bore, for example.
  • the flow of hydraulic fluid through the flow bore 76 is directed into the hydraulic fluid line 72.
  • the two non-return valves 64, 66 which respectively connect the supply connection via a hydraulic fluid line 74 to the hydraulic fluid lines 70, 72, are seated obliquely to the through-bores 76, which can be designed as an inlet bore and drainage bore.
  • the check valves 64, 66 are designed so that in a valve body 48, a ball 46 are pressed by means of a compression spring 44 in a valve seat 50.
  • the check valves 64, 66 are switched so that hydraulic fluid can flow only from the supply port into the respective support chambers 52, 54 of the swing motor 26, but can not flow in the reverse direction.
  • FIG. 9 shows a longitudinal section through the pivot motor 26 of the connecting rod 10 arranged in the connecting rod body 12 in the position for low compression.
  • the rotor 27 of the swivel motor 26 stands in such a way that the eccentric 21 with its bolt 30 in the lower position, so that the rotor blades 56 abut the stator vanes 58.
  • two first support chambers 52 and two second support chambers 54 are formed, wherein a volume of the first support chamber 52 and a volume of the second support chamber 54 by a Adjustment of rotor 27 against stator 28 complementary to each other are changeable.
  • the first and the second support chamber 52, 54 are sealed by a arranged on a running surface 62 of the rotor 27 and a running surface 63 of the stator 28 sealing strip 36, 37 against each other.
  • the first and the second support chamber 52, 54 are sealed by two arranged on an outer periphery 88 of the rotor 27 sealing elements 34 against an environment.
  • the sealing elements 34 are not visible in the illustrated section.
  • Figures 10 to 12 show various sections of the connecting rod 10 in a high compression position.
  • FIG. 10 in a first longitudinal section along the line AA in FIG. 3, the connecting rod 10 from FIG. 1 is shown in the position for high compression, while FIGS. 11 and 12 show the sections along the line CC in FIG Line DD in Figure 3 show.
  • the eccentric 21 is pivoted to the rotor 27 of the swing motor 26 in its upper position, so that the connecting rod 16 is pushed into the upper position.
  • the connecting rod 16 rests against a stop 42, not shown, at the upper end of the connecting rod body 12.
  • FIG. 13 shows a detailed view in a longitudinal section through the connecting rod cap 14 with details of the reversing valve 32 and the check valve 64 in the high compression position
  • FIG. 14 shows a detailed view in a further longitudinal section through the connecting rod cap 14 with details of the reversing valve 32 and other check valve 66 in the high compression position shows.
  • the spool 78 of the switching valve 32 is so that the hydraulic fluid passage 70, which is the mass flow passage, is directly connected to the supply port of the hydraulic fluid and the hydraulic fluid passage 72, which is the gas power passage, is closed.
  • FIG 16 is an exploded view of the connecting rod 10 of Figure 1 can be seen.
  • the connecting rod body 12 has in the receptacle for the pivot motor 26 of the stator 28 and rotor 27 has a bore which is the opening of the hydraulic fluid line 72 through which the grooves 84, 86 of the stator 28 can be supplied with hydraulic fluid, which then further into the Support chambers 52, 54 is passed.
  • Rotor 27 and stator 28 have the sealing strips 36, and 37 in their running surfaces 62, 63, while the rotor 27 via the arranged in the grooves 80, 82 sealing elements 34, for example in the form of O-rings, the support chambers 52, 54th seals against the environment.
  • Bolts 30 in the eccentric 21 of the rotor 27 and in the connecting rod 16 are connected to each other via the levers 24, 25 so that a rotation of the eccentric 21 results in a displacement of the connecting rod 16 guided in the connecting rod 12 with the connecting rod 18 and vice versa.
  • the connecting rod cap 14, in which the reversing valve 32 and the two check valves 64, 66 are arranged, is screwed to the Pleuel Sciences 12 and forms with this the Hublagerauge 38.
  • the check valves 64, 66 are shown with valve body 48, ball 46 and compression spring 44.
  • the stator 28 is arranged against rotation in the connecting rod body 12 and preferably welded thereto.
  • a stator cover is in the embodiment shown in one piece with the Connecting rod body 12 is provided. Likewise, it is conceivable to attach a separate stator cover to the connecting rod body 12.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

L'invention concerne une bielle (10) pour un moteur à combustion interne à compression variable, comportant un corps de bielle (12), une tige de bielle (16) guidée coulissante dans une direction longitudinale (L) du corps de bielle (12), pourvue d'un œillet de bielle (18), un chapeau de bielle (14) et un dispositif de réglage (20) à excentrique destiné à régler une longueur de bielle efficace (60). Le dispositif de réglage (20) à excentrique est disposé dans le corps de bielle (12) et présente un excentrique (21) interagissant avec au moins un levier (24, 25). Une course du dispositif de réglage (20) à excentrique peut être réglée au moyen d'une vanne de commutation (32), l'excentrique (4) pouvant pivoter autour de son axe de rotation et l'au moins un levier (24, 25) étant relié pivotant à la tige de bielle (16).
PCT/EP2017/066299 2016-07-25 2017-06-30 Bielle pour un moteur à combustion interne à compression variable WO2018019514A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016113640.9A DE102016113640A1 (de) 2016-07-25 2016-07-25 Pleuel für eine Brennkraftmaschine mit variabler Verdichtung
DE102016113640.9 2016-07-25

Publications (1)

Publication Number Publication Date
WO2018019514A1 true WO2018019514A1 (fr) 2018-02-01

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WO (1) WO2018019514A1 (fr)

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
AT521517B1 (de) * 2019-01-30 2020-02-15 Avl List Gmbh Längenverstellbares Pleuel mit Stiftverbindung

Citations (6)

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GB2161580A (en) * 1984-07-07 1986-01-15 Peter Robert Davis Variable length connecting rod
GB2409884A (en) * 2004-01-09 2005-07-13 Ford Global Tech Llc Variable length connecting rod for variable compression ratio i.c. engine
WO2010108582A1 (fr) 2009-03-26 2010-09-30 Ixetic Bad Homburg Gmbh Dispositif destiné à faire varier le rapport de compression dans un moteur à combustion interne
US20110226220A1 (en) * 2010-03-17 2011-09-22 Wilkins Larry C Internal combustion engine with hydraulically-affected stroke
WO2013092364A1 (fr) 2011-12-23 2013-06-27 Avl List Gmbh Bielle de moteur à pistons alternatifs
EP2821619A1 (fr) * 2013-07-05 2015-01-07 Hilite Germany GmbH Bielle pour une étanchéification variable en deux étapes

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