WO2017102485A1 - Bielle pour un moteur à combustion interne à compression variable - Google Patents

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

Info

Publication number
WO2017102485A1
WO2017102485A1 PCT/EP2016/080003 EP2016080003W WO2017102485A1 WO 2017102485 A1 WO2017102485 A1 WO 2017102485A1 EP 2016080003 W EP2016080003 W EP 2016080003W WO 2017102485 A1 WO2017102485 A1 WO 2017102485A1
Authority
WO
WIPO (PCT)
Prior art keywords
connecting rod
valve
cylinder
check valve
hydraulic fluid
Prior art date
Application number
PCT/EP2016/080003
Other languages
German (de)
English (en)
Inventor
Alexander MUDRA
Dietmar Schulze
Stefanie Hutzelmann
David Huber
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 WO2017102485A1 publication Critical patent/WO2017102485A1/fr

Links

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
    • 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
    • F16C2360/00—Engines or pumps
    • F16C2360/22—Internal combustion engines
    • 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
    • F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
    • F16C9/04—Connecting-rod bearings; Attachments thereof

Definitions

  • the invention relates to a connecting rod for an internal combustion engine with variable compression, with an upper and a lower connecting rod, with an eccentric adjusting device for adjusting an effective connecting rod length, wherein the eccentric adjusting device has at least one cylinder with a piston which guided in a cylinder bore displaceable and is connected to a support rod, wherein an inlet for supplying hydraulic fluid into the cylinder and a drain for discharging hydraulic fluid from the cylinder are provided.
  • 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 at 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.
  • systems with variable connecting rod length known, which operate with the aid of hydraulically or mechanically actuated changeover valves an eccentric adjusting device of a connecting rod.
  • the processing of the connecting rod and in particular of the connecting rod body is expensive and therefore costly. Therefore, it is an object of the invention to provide an improved to that end connecting rod.
  • a connecting rod for an internal combustion engine with variable compression with an upper and a lower connecting rod, with an eccentric adjusting device for adjusting an effective connecting rod length
  • the eccentric adjusting device has at least one cylinder with a piston which guided in a cylinder bore displaceable and is connected to a support rod, and wherein an inlet for supplying hydraulic fluid into the cylinder and a drain for discharging hydraulic fluid from the cylinder are provided.
  • a switching valve is provided for controlling a hydraulic fluid flow, wherein the supply and drainage of hydraulic fluid into and out of the cylinder takes place mainly via the switching valve and at least one check valve is provided, which is integrated in the switching valve and which releases a flow of hydraulic fluid in the direction of inlet or locks, the process bypassing the check valve in the changeover valve.
  • a single line between the switching valve and the cylinder may be provided as inlet and outlet.
  • only three oil lines in the connecting rod are necessary, one to the support chambers of the at least one cylinder and a supply bore to the bearing shell of the connecting rod.
  • a relief line may be provided which connects the switching valve with an oil circuit of the internal combustion engine during operation.
  • the relief line connects the switching valve to an oil circuit (e.g., the bearing shell) of the internal combustion engine.
  • the hydraulic fluid is basically distributed in the changeover valve by appropriate connections between the two cylinders, i. that the relief line essentially serves only to drain excess or missing hydraulic fluid due to leakage or due to the different volumes of the cylinder from the switching valve or to suck in the switching valve.
  • two cylinders may be provided.
  • a common condyle design can be used.
  • a double-acting cylinder may be provided instead.
  • the check valve may be provided as a check valve.
  • the check valve may be provided as a ball check valve. This allows the use of a proven and reliable technique.
  • the process can be provided with a throttled bore.
  • the process may bypass the check valve in the changeover valve. Since the inflows and outflows as well as a discharge line can start from the changeover valve, the processing of the connecting rod body can be considerably simplified.
  • the check valve in particular the movement axis of its closing element, can be arranged perpendicular to accelerations occurring in the connecting rod.
  • the check valves in particular the axes of movement of their closing elements, are perpendicular to the high accelerations in the connecting rod.
  • the check valve can be arranged longitudinally to occurring in the connecting rod accelerations. Conveniently, the accelerations may assist the closing action and the opening of the check valve. The check valve may respond faster to a changeover.
  • the check valve may be provided as a check valve, in particular ball check valve, in particular with two check valves so that closing elements of the check valves when opening execute a movement having a component from the upper in the direction of the lower connecting rod. That the closing elements or the balls can be movable counter to accelerations occurring in the connecting rod. Conveniently, the accelerations may assist the closing action and the opening of the check valve. Unintentional opening of a check valve can be avoided.
  • the check valves may be arranged transversely, in particular perpendicular, to the drain. Mass forces can be used to advantage for the operation of the check valves.
  • a valve seat of the check valve may have a spherical portion.
  • the mold can secure the valve seat against leakage of hydraulic fluid from the valve seat.
  • Fig. 1 is a front view of a connecting rod according to the invention in a position smaller
  • FIG. 2 shows a side view of the connecting rod according to the invention in FIG. 1;
  • Fig. 3 is a rear view of the connecting rod according to the invention in Figure 1;
  • FIG. 4 is a plan view from above of the connecting rod according to the invention in FIG. 1;
  • Fig. 5 is a plan view from above of a section through the connecting rod according to the invention.
  • Fig. 6 is an enlargement of a detail of the plan view in Figure 5 with transverse
  • Fig. 7-1 different longitudinal sections through the connecting rod according to the invention in Figure 1;
  • FIG. 12 is an enlarged detailed view of the sectional view in FIG. 7; FIG.
  • Fig. 13 is an enlarged detail view of the sectional view in Figure 1 1;
  • FIG. 14 shows a further longitudinal section through a connecting rod according to the invention as in FIG. 1 with an alternative variant of a check valve in the changeover valve in a position for low compression;
  • FIG. 15 shows a longitudinal section through the reversing valve of the connecting rod in FIG. 14;
  • Fig. 16 is an isometric view of ball check valves in the switching valve of
  • FIG. 17 shows a section through the reversing valve of the connecting rod in FIG. 14.
  • Figures 1 to 4 show different views of a connecting rod 1 according to the invention for a variable compression of an internal combustion engine, with an upper and a lower connecting rod and with an eccentric adjusting device 2 for adjusting an effective connecting rod length.
  • the eccentric adjusting device 2 has an eccentric 4 cooperating with a one-part or multi-part eccentric lever 3. In this case, an adjustment of the eccentric adjusting device 2 by means of a switching valve 5 is adjustable.
  • a rotation of the adjustable eccentric adjusting device 2 is initiated by the action of mass and load forces of the internal combustion engine, which act on the eccentric adjusting device 2 at a power stroke of the internal combustion engine.
  • the directions of action of the force acting on the eccentric adjusting device 2 change Forces continuously.
  • the rotary movement or adjusting movement is assisted by one or more hydraulic fluid, in particular engine oil, acted upon, integrated in the connecting rod 1 piston 6, 7, or the pistons 6, 7 prevent a return part of the eccentric adjusting device 2 due to varying directions of force acting on the eccentric - Adjustment device 2 acting forces.
  • the pistons 6, 7 are operatively connected by means of support rods 8, 9 with the eccentric lever 3.
  • Figures 5 and 6 show a plan view of a section through the connecting rod 1 at the level of the switching valve 5.
  • the switching valve 5 two check valves designed as ball check valves 18, 19 are integrated.
  • the check valves 18, 19 designed as ball check valves are oriented in the transverse direction Q and perpendicular to the vertical axis H (FIG. 1) of the connecting rod 1.
  • These or the axes of movement of their closing elements are therefore transversely - in particular perpendicular - to the high accelerations in the connecting rod, so that an effect of mass forces in the longitudinal axis of the ball check valves designed as shut-off valves 18, 19 are avoided and accidental opening or closing can be prevented.
  • FIGS. 7 to 11 which show different sections of the connecting rod 1
  • the pistons 6, 7 are displaceably guided in each case in a cylinder bore 10, 11 of a cylinder 12, 13.
  • the cylinders 12, 13 may be provided as a separate component or integrally with a connecting rod of the connecting rod 1. It is also conceivable to provide the connecting rod 1 with only one cylinder and to use a double-acting piston.
  • feeds 14, 15 for supplying hydraulic fluid from the switching valve 5 are provided in hydraulic chambers formed by the cylinder bores 10, 11, and drains 16, 17 for discharging hydraulic fluid from the hydraulic chambers to the switching valve 5.
  • the invention provides that the connections of the inlets 14, 15 and the processes 16, 17 mainly via the switching valve 5, which is provided for controlling the hydraulic fluid flow. Furthermore, check valves 18, 19 are provided, which are integrated in the changeover valve and which in each case enable or block a flow of hydraulic fluid in the direction of inlets 14, 15. The processes 16, 17 bypass the check valves 18, 19 in the changeover valve 5 and are provided with a throttled bore Mistake. Since the inflows and outflows 14, 15, 16, 17 and a discharge line 20 emanate from the switching valve 5, the processing of the connecting rod body can be substantially simplified.
  • the relief line 20 connects the switching valve 5 to an oil circuit (e.g., the bearing cup) of the internal combustion engine.
  • an oil circuit e.g., the bearing cup
  • the hydraulic fluid is basically distributed in the changeover valve 5 by corresponding connections between the two cylinders 12, 13, i. that the discharge line 20 essentially serves only to derive excess or missing hydraulic fluid due to leakage or due to the different volumes of the cylinders 12, 13 from the switching valve 5 or nachzusaugen in the switching valve 5.
  • FIGS. 12 and 13 which each have an enlarged section of FIGS 1 1 show.
  • the dashed lines 21 represent the possible hydraulic fluid flow in the direction of the oil circuit and the dash-dot lines 22 represent the possible hydraulic fluid flow in the direction of the cylinder bore.
  • check valves 18, 19 as check valves, in particular ball check valves with balls as closing elements, provided, in particular Figure 5 and Figure 6, which shows an enlarged section, can be seen.
  • check valves 18, 19 and the axes of movement of their closing elements are transverse - in particular perpendicular - to the high accelerations in the connecting rod 1, so that no mass forces occur in the longitudinal axis of the check valve, which can cause unintentional opening / closing.
  • FIG. 14 shows a connecting rod 1 as in FIG. 1 with a variant of the one in the changeover valve 5 integrated stop valve 18, 19.
  • the rest of the structure of the connecting rod 1 corresponds to that in the previous embodiment, so that only the check valves 18, 19 are discussed, which are shown in different views in Figures 15-17.
  • two check valves designed as ball check valves 18, 19 are integrated.
  • the check valves 18, 19 designed as ball check valves are oriented in the direction of the vertical axis H (FIG. 1) of the connecting rod 1. Acceleration forces in the connecting rod 1, the respective formed as a ball 25, 26 closing element of the ball check valves designed as shut-off valves 18, 19 press into their respective seat. That the closing elements perform a movement when opening, which has a component from the upper in the direction of the lower connecting rod.
  • the switching of the switching valve 5 is carried out in a conventional manner with a pickup 30 which extends in the direction of the transverse axis Q ( Figure 6) and which is locked by means of a positioning element in the form of a loaded with a compression spring 34 positioning ball 31 in one of two positions ,
  • a positioning element in the form of a loaded with a compression spring 34 positioning ball 31 in one of two positions
  • successive two recesses 32, 33 are formed in the gripper 30 on the circumference in the axial direction, wherein the positioning ball 31 can engage in one or the other of the recesses 32, 33.
  • the respective valve seat 23 has a spherical section at its free end, so that it has a sufficient contact surface with the bore wall in the hole for the check valve, even if the valve seat 23 is tilted, so as to prevent the hydraulic fluid from escaping. Hydraulic fluid can enter via openings 27 in the valve seat 23 in the discharge line 20 or be sucked out of this.

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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 (1) pour un moteur à combustion interne à compression variable, comprenant un pied de bielle et une tête de bielle, comprenant un dispositif de réglage d'excentrique (2) pour le réglage d'une longueur effective de bielle, le dispositif de réglage d'excentrique (2) comprenant au moins un cylindre (12, 13) doté d'un piston (6, 7), lequel est guidé de manière coulissante dans un alésage de cylindre (10, 11) et relié à une tige de support (8, 9), une admission (14, 15) pour l'introduction de liquide hydraulique dans le cylindre (12, 13) ainsi qu'une sortie (16, 17) pour l'évacuation de liquide hydraulique hors du cylindre (12, 13) étant prévues. Une soupape d'inversion (5) sert à commander un flux de liquide hydraulique, l'admission de liquide hydraulique dans le cylindre (12, 13) et l'évacuation de liquide hydraulique hors de celui-ci s'effectuant principalement par le biais de la soupape d'inversion (5), et au moins une soupape d'arrêt (18, 19) étant prévue, laquelle est intégrée à la soupape d'inversion (5) et laquelle libère ou bloque un écoulement de liquide hydraulique en direction de l'admission (14, 15), la sortie (16, 17) contournant la soupape d'arrêt (18, 19) dans la soupape d'inversion (5).
PCT/EP2016/080003 2015-12-16 2016-12-07 Bielle pour un moteur à combustion interne à compression variable WO2017102485A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102015121939 2015-12-16
DE102015121939.5 2015-12-16
DE102016109516 2016-05-24
DE102016109516.8 2016-05-24

Publications (1)

Publication Number Publication Date
WO2017102485A1 true WO2017102485A1 (fr) 2017-06-22

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ID=57570049

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Application Number Title Priority Date Filing Date
PCT/EP2016/080003 WO2017102485A1 (fr) 2015-12-16 2016-12-07 Bielle pour un moteur à combustion interne à compression variable

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DE (1) DE102016123635A1 (fr)
WO (1) WO2017102485A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3102814A1 (fr) * 2019-11-04 2021-05-07 MCE 5 Development Bielle à longueur variable pour moteur à rapport volumétrique piloté

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012014917A1 (de) * 2011-07-29 2013-02-07 Fev Gmbh Druckimpulsansteuerung für eine Verstelleinrichtung eines variablen Verdichtungsverhältnisses
DE102012020999A1 (de) * 2012-07-30 2014-01-30 Fev Gmbh Hydraulischer Freilauf für variable Triebwerksteile
WO2015082722A2 (fr) * 2013-12-06 2015-06-11 Fev Gmbh Bielle de longueur variable d'un moteur à combustion interne
DE102014106715A1 (de) * 2014-05-13 2015-11-19 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Umschaltventil und Verbrennungsmotor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012014917A1 (de) * 2011-07-29 2013-02-07 Fev Gmbh Druckimpulsansteuerung für eine Verstelleinrichtung eines variablen Verdichtungsverhältnisses
DE102012020999A1 (de) * 2012-07-30 2014-01-30 Fev Gmbh Hydraulischer Freilauf für variable Triebwerksteile
WO2015082722A2 (fr) * 2013-12-06 2015-06-11 Fev Gmbh Bielle de longueur variable d'un moteur à combustion interne
DE102014106715A1 (de) * 2014-05-13 2015-11-19 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Umschaltventil und Verbrennungsmotor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3102814A1 (fr) * 2019-11-04 2021-05-07 MCE 5 Development Bielle à longueur variable pour moteur à rapport volumétrique piloté
WO2021089940A1 (fr) * 2019-11-04 2021-05-14 MCE 5 Development Bielle a longueur variable pour moteur a rapport volumetrique pilote

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