DE3346967A1 - Trunk piston with variable compression level - Google Patents

Trunk piston with variable compression level

Info

Publication number
DE3346967A1
DE3346967A1 DE19833346967 DE3346967A DE3346967A1 DE 3346967 A1 DE3346967 A1 DE 3346967A1 DE 19833346967 DE19833346967 DE 19833346967 DE 3346967 A DE3346967 A DE 3346967A DE 3346967 A1 DE3346967 A1 DE 3346967A1
Authority
DE
Germany
Prior art keywords
piston
chamber
sealing washer
head
control chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19833346967
Other languages
German (de)
Other versions
DE3346967C2 (en
Inventor
Wolfgang 7141 Benningen Bierkant
Emil 7148 Remseck Ripberger
Felix 7146 Tamm Vuckovic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle GmbH
Original Assignee
Mahle 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 Mahle GmbH filed Critical Mahle GmbH
Priority to DE19833346967 priority Critical patent/DE3346967A1/en
Publication of DE3346967A1 publication Critical patent/DE3346967A1/en
Application granted granted Critical
Publication of DE3346967C2 publication Critical patent/DE3346967C2/de
Granted legal-status Critical Current

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
    • F02B75/044—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of an adjustable piston length

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

Abstract

In the case of a trunk piston with variable compression level, in which the variation in the compression level is brought about by two chambers (5, 6) of varying volume to which hydraulic oil is admitted, one of the chambers (5, 6) is arranged at the radial centre of the piston bottom section fixed to the piston pin (2). A sealing washer (7) closing off this chamber (damping chamber 6) and causing the variation in the volume of this chamber is bolted to the piston head (1) by way of a central bolt (8). The bolt (8) simultaneously serves for the accommodation of a pressure relief valve for the space of the second chamber (control chamber 5). The piston is characterised by a construction of simple design and low axial height of the annular section connected to the piston head (1). <IMAGE>

Description

Tauchkolben mit variabler KompressionshöhePlunger with variable compression height

Die Erfindung betrifft einen Tauchkolben mit variabler Kompressionshöhe nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a plunger with a variable compression height according to the preamble of claim 1.

Tauchkolben dieser Art sind z. B. aus der DE 29 38 547 A1 bekannt. Bei jenem Kolben ist die Dämpfungs-Kammer als ein im Inneren an die Ringpartie des Kolbenbodens angrenzender Ringraum ausgebildet. Um einen solchen Ringraum vorsehen zu können, werden sowohl an dem Kolbenboden als auch an dem Kolbenunterteil jeweils ein erst während der Montage fixierbarer Ring benötigt.Plungers of this type are z. B. from DE 29 38 547 A1 known. In that piston, the damping chamber is as a formed in the interior of the annular space adjoining the ring belt of the piston head. To provide such an annulus to be able to be fixed both on the piston head and on the piston lower part only during assembly Ring needed.

Hiervon ausgehend liegt der Erfindung in erster Linie ä,±e Aufgabe zugrunde, den Aufbau eines solchen Kolbens zu vereinfachen. Darüberhinaus wird angestrebt, die axiale Bauhöhe der direkt an dem Kolbenboden angeformten Ringpartie möglichst klein zu halten und gegebenenfalls sogar nur die oberste Ringnut in der fest mit dem Kolbenboden verbundenen Ringpartie vorzusehen, während die übrigen Ringnuten in dem Kolbenunterteil angeordnet sind.Starting herefrom, the present invention is similar in the first place, ± e object of the invention to simplify the construction of such a piston. In addition, the aim is to keep the overall axial height of the ring belt formed directly on the piston head as small as possible and, if necessary, even to provide only the uppermost ring groove in the ring belt firmly connected to the piston head, while the other ring grooves are arranged in the piston base.

Gelöst wird diese Aufgabe durch eine Ausbildung des Kolbens nach den kennzeichnenden Merkmalen des Patentanspruchs 1.This object is achieved by designing the piston according to the characterizing features of claim 1.

EP/PF/KE
08.13.83EP / PF / KE
08.13.83

z>z>

Besonders zweckmäßig ist es bei dieser Ausführungsform, das Druckbegrenzungsventil in die mit der Dichtscheibe verbundene Schraube baulich zu integrieren.It is particularly useful in this embodiment that Integrate the pressure relief valve structurally in the screw connected to the sealing washer.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt, die jeweils eine Hälfte des Kolbens in zueinander um 90°versetzten Längsschnitten zeigt. Im übrigen ist der Kolben in der rechten Hälfte der Zeichnung mit seiner maximalen Kompressionshöhe und auf der linken Seite der Zeich· nung mit seiner minimalen Kompressionshöhe dargestellt.An embodiment of the invention is shown in the drawing, each one half of the piston in each other shows longitudinal sections offset by 90 °. Otherwise, the piston is in the right half of the drawing with his maximum compression height and shown on the left side of the drawing with its minimum compression height.

Der Kolbenboden 1 ist gegenüber dem mit dem Kolbenbolzen 2 verbundenen Kolbenunterteil 3 zur Veränderung der Kompressionshöhe des Kolbens axial verschiebbar. Der für die Führung des Kolbens hauptsächlich verantwortliche KolbenschaftThe piston crown 1 is opposite the piston lower part 3 connected to the piston pin 2 for changing the compression height of the piston can be moved axially. The piston skirt mainly responsible for guiding the piston

4 ist unabhängig von dem Kolbenunterteil 3 an dem Kolbenbolzen 2 gelagert.4 is mounted on the piston pin 2 independently of the piston lower part 3.

Die Kompressionshöhenänderung erfolgt durch Füllen und Leeren der Drucköl-Kammern, von denen die Steuerkammer mitThe compression height change takes place by filling and emptying the pressure oil chambers, of which the control chamber with

5 und die Dämpfungskammer mit 6 bezeichnet ist. Die Volumenveränderung der unteren Kammer 6 erfolgt durch ein Verschieben der Dichtscheibe 7. Diese ist über eine Schraube fest mit dem Kolbenboden 1 verbunden. Diese Schraube 8 beherbergt in ihrem Inneren die bei einem federbelasteten Kugelventil erforderlichen Teile und bildet damit das in Kolben mit variabler Kompressionshöhe übliche Druckbegrenzungsventil, durch das Drucköl aus der Steuerkammer 5 in den Kurbelraum abfließen kann.5 and the damping chamber is denoted by 6. The change in volume the lower chamber 6 is done by moving the sealing washer 7. This is via a screw firmly connected to the piston head 1. This screw 8 houses the inside of a spring-loaded ball valve required parts and thus forms the pressure relief valve common in pistons with variable compression height, can flow through the pressure oil from the control chamber 5 into the crankcase.

Für die Kompressionshöhenverstellung ist der Kolben wie üblich noch mit zwei Rückschlagventilen 9 und 10 sowie einer Drossel 11 versehen. Durch das Rückschlagventil 9 gelangt das Drucköl von dem Kolbenbolzen 2 aus über nicht darge-For the compression height adjustment, the piston is, as usual, with two check valves 9 and 10 and one Throttle 11 is provided. Passed through the check valve 9 the pressure oil from the piston pin 2 via not shown

stellte Leitungen in die Steuerkammer 5. Die Steuerkammer ist mit der Dämpfungskammer 6 über ein Rückschlagventil 10 sowie eine parallele Drossel 11 verbunden. Das Rückschlagventil 10 sperrt einen ölfluß in Richtung von der Dämpfungskammer 6 zur Steuerkammer 5, während das Rückschlagventil 9 in Richtung von der Steuerkammer 5 zum Kolbenbolzen 2 ^; sperrt.put lines in the control chamber 5. The control chamber is connected to the damping chamber 6 via a check valve 10 and a parallel throttle 11. The check valve 10 blocks an oil flow in the direction of the damping chamber 6 to the control chamber 5, while the check valve 9 in the direction of the control chamber 5 to the piston pin 2 ^; locks.

Durch die Verwendung eines im Durchmesser kleinen Ringraumes als Dämpfungskammer 6 kann der mit dem Kolbenboden bewegliche Teil der Ringpartie auf ein axial äußerst niedriges Maß ausgelegt werden. Damit ist es mit der erfindungsgemässen Ausführung möglich, lediglich einen nur die erste Ringnut aufnehmenden Bereich der Ringpartie als mit dem Kolbenboden verschiebbar auszubilden. Dies ermöglicht wiederrum eine Gewichtsreduzierung der zur Kompressionshöhenveränderung erforderlichen frei beweglichen Teile.By using an annular space with a small diameter as the damping chamber 6, the one that is movable with the piston head can Part of the ring belt can be designed to be axially extremely low. So it is with the inventive Execution possible, only one area of the ring belt receiving only the first ring groove than with the piston crown train to be displaceable. This in turn enables a reduction in weight for changing the compression height required freely moving parts.

Beschrieben ist ein Kolben mit einem nur an dem Kolbenbolzen angelenkten Schaft 4. Selbstverständlich kann dieser Schaft 4 auch integrierter Bestandteil des Kolbenunterteils 3 sein.A piston is described with a shaft 4 that is hinged only to the piston pin Shank 4 also an integral part of the piston lower part 3 be.

Claims (2)

33469G733469G7 PatentansprücheClaims /. Tauchkolben mit variabler Kompressionshöhe für Verbrennungsmotoren, bei dem der Kolbenboden (1) mit zumindest einem Teil der Kolbenringpartie axial relativ verschiebbar auf dem den Kolbenbolzen (2) aufnehmenden Kolbenunterteil angeordnet ist und bei dem zwei mit Drucköl füllbare Kammern (5, 6) vorgesehen sind, deren jeweiliges Volumen sich bei Relatiwerschiebung des Kolbenbodens (1) in reziprokem Verhältnis verändert und von denen eine erste Kammer (Steuerkammer 5) direkt unter dem Kolbenboden (1) liegt, während eine zweite Kammer (Dämpfungskammer 6) unterhalb der Steuerkammer (5) angeordnet ist und bei dem weiterhin das Drucköl über Ventile geführt ist, von denen eines als Druckbegrenzungsventil ausgebildet und zwischen Steuerkammer (5) und einem zum Kurbelgehäuse offenen Raum angeordnet ist, dadurch gekennzeichnet , daß die Dämpfungskammer (6) im Inneren des Kolbenunterteiles (3) angeordnet ist und daß deren Volumen von einer zentral mit dem Kolbenboden (1) verbundenen Dichtscheibe (7) veränderbar ist, wobei diese Dichtscheibe (7) durch eine Schraube (8), deren Schraubenkopf sie sein kann, mit dem Kolbenboden (1) verschraubt ist./. Plungers with variable compression height for internal combustion engines, in which the piston head (1) is axially relatively displaceable with at least a part of the piston ring section is arranged on the piston lower part receiving the piston pin (2) and in which two can be filled with pressurized oil Chambers (5, 6) are provided, the respective volume of which is reciprocal when the piston head (1) is moved relative to one another Ratio changed and of which a first chamber (control chamber 5) directly below the piston head (1) lies, while a second chamber (damping chamber 6) is arranged below the control chamber (5) and in which Furthermore, the pressure oil is passed through valves, one of which is designed as a pressure relief valve and between Control chamber (5) and a space open to the crankcase is arranged, characterized in that that the damping chamber (6) is arranged in the interior of the piston lower part (3) and that the volume of a sealing washer connected centrally to the piston crown (1) (7) can be changed, this sealing washer (7) by a screw (8), the screw head of which it can be, with is screwed to the piston crown (1). 2. Tauchkolben nach Anspruch 1, dadurch gekennzeichnet , daß das Druckbegrenzungsventil baulich in die mit der Dichtscheibe (7) verbundene Schraube (8) integriert ist.2. Plunger piston according to claim 1, characterized in that the pressure relief valve structurally is integrated into the screw (8) connected to the sealing washer (7). EP/PF/KEEP / PF / KE 08.11.83
VK 58711/08/83
VK 587 BAD ORIGINALBATH ORIGINAL
DE19833346967 1983-12-24 1983-12-24 Trunk piston with variable compression level Granted DE3346967A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19833346967 DE3346967A1 (en) 1983-12-24 1983-12-24 Trunk piston with variable compression level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833346967 DE3346967A1 (en) 1983-12-24 1983-12-24 Trunk piston with variable compression level

Publications (2)

Publication Number Publication Date
DE3346967A1 true DE3346967A1 (en) 1985-07-04
DE3346967C2 DE3346967C2 (en) 1992-07-16

Family

ID=6218056

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19833346967 Granted DE3346967A1 (en) 1983-12-24 1983-12-24 Trunk piston with variable compression level

Country Status (1)

Country Link
DE (1) DE3346967A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4018344C1 (en) * 1990-06-08 1992-01-02 Mtu Friedrichshafen Gmbh Piston for IC-engine - has central section of piston attached to underside of guide ring
US9309831B2 (en) 2011-10-08 2016-04-12 Daimler Ag Piston arrangement for a combustion chamber of an internal combustion engine, having a variable compression ratio

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011115413A1 (en) 2011-10-08 2013-04-11 Daimler Ag Piston arrangement for combustion chamber, particularly cylinder of internal combustion engine, has piston, unit for variable adjustment of compression ratio of combustion chamber and piston pin coupled with piston by connecting portions

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2323742A (en) * 1942-03-19 1943-07-06 Philip S Webster Internal combustion engine piston
US2446348A (en) * 1946-03-21 1948-08-03 Philip S Webster Piston
US3038458A (en) * 1959-10-09 1962-06-12 British Internal Combust Eng Internal combustion engines and pistons therefor
DE2719043A1 (en) * 1977-04-28 1978-11-02 Teledyne Ind Variable compression ratio piston - has relatively movable outer and inner members controlled by hydraulic system using oil from engine lubrication system
DE2938547A1 (en) * 1979-09-24 1981-04-09 Teledyne Industries, Inc., Los Angeles, Calif. Variable compression ratio piston - has outer part telescopically mounted on upper end of inner part

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2323742A (en) * 1942-03-19 1943-07-06 Philip S Webster Internal combustion engine piston
US2446348A (en) * 1946-03-21 1948-08-03 Philip S Webster Piston
US3038458A (en) * 1959-10-09 1962-06-12 British Internal Combust Eng Internal combustion engines and pistons therefor
DE2719043A1 (en) * 1977-04-28 1978-11-02 Teledyne Ind Variable compression ratio piston - has relatively movable outer and inner members controlled by hydraulic system using oil from engine lubrication system
DE2938547A1 (en) * 1979-09-24 1981-04-09 Teledyne Industries, Inc., Los Angeles, Calif. Variable compression ratio piston - has outer part telescopically mounted on upper end of inner part

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4018344C1 (en) * 1990-06-08 1992-01-02 Mtu Friedrichshafen Gmbh Piston for IC-engine - has central section of piston attached to underside of guide ring
US9309831B2 (en) 2011-10-08 2016-04-12 Daimler Ag Piston arrangement for a combustion chamber of an internal combustion engine, having a variable compression ratio

Also Published As

Publication number Publication date
DE3346967C2 (en) 1992-07-16

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D2 Grant after examination
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