DE3346969A1 - Trunk piston with variable compression level for combustion engines - Google Patents

Trunk piston with variable compression level for combustion engines

Info

Publication number
DE3346969A1
DE3346969A1 DE19833346969 DE3346969A DE3346969A1 DE 3346969 A1 DE3346969 A1 DE 3346969A1 DE 19833346969 DE19833346969 DE 19833346969 DE 3346969 A DE3346969 A DE 3346969A DE 3346969 A1 DE3346969 A1 DE 3346969A1
Authority
DE
Germany
Prior art keywords
control chamber
piston
variable compression
compression level
combustion engines
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.)
Withdrawn
Application number
DE19833346969
Other languages
German (de)
Inventor
Emil 7148 Remseck Ripberger
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 DE19833346969 priority Critical patent/DE3346969A1/en
Publication of DE3346969A1 publication Critical patent/DE3346969A1/en
Withdrawn legal-status Critical Current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

Landscapes

  • 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)

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, of which the control chamber (5) adjoins one wall of the piston head (1), which is directly exposed to the combustion gases, this wall of the piston head (1) is provided on the control chamber side with an insulating layer (11). This is intended to prevent coking of the oil in the chambers (5) and (6). <IMAGE>

Description

Tauchkolben mit veränderlicher Kompressionshöhe für VerbrennungsmotorenPlungers with variable compression height for internal combustion engines

Die Erfindung betrifft einen Tauchkolben mit veränderlicher Kompressionshöhe für Verbrennungsmotoren nach dem Oberbegriff des Patentanspruchs.The invention relates to a plunger with variable compression height for internal combustion engines according to the preamble of the claim.

Tauchkolben mit veränderlicher Kompressionshöhe sind in dieser Art z. B. bekannt aus DE 27 19 043 C2. Bei dieser Bauart kann die Gefahr bestehen, daß das in der Steuerkammer befindliche öl infolge der von dem Kolbenboden ausgehenden hohen Temperatur verkoken kann. Hier Abhilfe zu schaffen, ist die Aufgabe der vorliegenden Erfindung.Plungers with variable compression height are in this type, for. B. known from DE 27 19 043 C2. With this type of construction there is a risk that the oil in the control chamber as a result of the high temperature emanating from the piston crown can coke. The object of the present invention is to remedy this situation.

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

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt. Diese zeigt jeweils eine Hälfte des Kolbens in zueinander um 90° versetzten Längsschnitten.An exemplary embodiment is shown in the drawing. This shows half of the piston at 90 ° to each other staggered longitudinal sections.

Der Kolbenboden 1 ist gegenüber dem mit dem Kolbenbolzen 2 verbundenen Kolben-Innenteil 3 zur Veränderung der Kompressionshöhe des Kolbens axial verschiebbar. Der für die Führung des Kolbens hauptsächlich verantwortliche Kolbenschaft 4 ist unabhängig von dem Innenteil 3 an dem Kolbenbolzen 2 gelagert.The piston crown 1 is connected to the piston pin 2 with respect to that Inner piston part 3 is axially displaceable to change the compression height of the piston. The one responsible for the management of the Piston mainly responsible piston skirt 4 is independent mounted on the piston pin 2 by the inner part 3.

EP/PF-je
21.10.83
VK 585EP / PF-each
10/21/83
VK 585

Die Kompressionshöhenänderung erfolgt durch Füllen und Leeren der Steuerkammer 5 und Dämpfungskammer 6, wobei sich deren Volumina jeweils in reziprokem Verhältnis zueinander verändern. Das die beiden genannten Kammern steuernde Drucköl wird durch das Innere des Kolbenbolzens 2 über ein Rückschlagventil 7 zugeführt. Zur Verbindung der Dämpfungskammer 6 mit der Steuerkammer 5 dienen ein in Richtung zur Steuerkammer sperrendes Rückschlagventil 8 sowie eine parallel dazu geschaltete Drosselbohrung 9. Bei einer Kompressionshöhenverkleinerung wird das Drucköl über ein Druckbegrenzungsventil 12 aus der Steuerkammer 5 zurück in den Kurbelraum des Motors geführt. Die der Steuerkammer zugewandte Oberfläche des Kolbenbodens 1 ist zur Wärmeisolation mit einer Keramikschicht 11, die z. B. aufgespritzt ist, versehen.The compression height change is done by filling and emptying the control chamber 5 and the damping chamber 6, the volumes of which change in reciprocal relationship to one another. The pressure oil controlling the two chambers mentioned is released through the interior of the piston pin 2 via a check valve 7 supplied. To connect the damping chamber 6 with the control chamber 5 is provided with a check valve 8 blocking in the direction of the control chamber and one connected in parallel therewith Throttle bore 9. When the compression height is reduced, the pressure oil is released via a pressure relief valve 12 out of the control chamber 5 back into the crankcase of the engine. The surface of the piston crown facing the control chamber 1 is for thermal insulation with a ceramic layer 11, the z. B. is sprayed, provided.

- Leerseite - - blank page -

Claims (1)

EP/PF-je
.10.83EP / PF-each
.10.83 PatentanspruchClaim Tauchkolben mit veränderlicher Kompressionshöhe für Verbrennungsmotoren, bestehend aus einem an dem Kolbenbolzen (2) angelengten Innenteil (3), einem daran verschiebbar gehaltenen Kolbenboden (1) sowie einer ersten und einer zweiten miteinander verbundenen Kammer, deren Volumina sich bei einer Relativbewegung zwischen Innenteil (3) und Kolbenboden (1) reziprok zueinander verändern und die mit von außen über die erste Kammer (Steuerkammer) ein- und abführbarem öl beaufschlagt sind, wobei die Steuerkammer zumindest z. T. an. eine Wand des Kolbenbodens (1) angrenzt, die den Verbrennungsgasen direkt ausgesetzt ist, dadurch gekennzeichnet , daß diese der Steuerkammer (5) zugewandte Wand des Kolbenbodens (1) an ihrer der Steuerkammer (5) zugewandten Oberfläche zumindest teilweise mit einer Isolierschicht (11) versehen ist.Plungers with variable compression height for internal combustion engines, consisting of an inner part (3) attached to the piston pin (2) and one that is slidable on it held piston head (1) and a first and a second interconnected chamber, their volumes change reciprocally to one another during a relative movement between the inner part (3) and the piston head (1) and the with from the outside via the first chamber (control chamber) oil which can be introduced and removed are acted upon, the control chamber at least z. T. at. a wall of the piston crown (1) which is directly exposed to the combustion gases is adjacent thereby characterized in that this wall of the piston head (1) facing the control chamber (5) on its control chamber (5) facing surface is at least partially provided with an insulating layer (11).
DE19833346969 1983-12-24 1983-12-24 Trunk piston with variable compression level for combustion engines Withdrawn DE3346969A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19833346969 DE3346969A1 (en) 1983-12-24 1983-12-24 Trunk piston with variable compression level for combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833346969 DE3346969A1 (en) 1983-12-24 1983-12-24 Trunk piston with variable compression level for combustion engines

Publications (1)

Publication Number Publication Date
DE3346969A1 true DE3346969A1 (en) 1985-07-04

Family

ID=6218058

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19833346969 Withdrawn DE3346969A1 (en) 1983-12-24 1983-12-24 Trunk piston with variable compression level for combustion engines

Country Status (1)

Country Link
DE (1) DE3346969A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4022508A1 (en) * 1990-07-14 1992-01-16 Mahle Gmbh IC engine piston with variable compression height
WO2007142556A2 (en) * 2006-06-06 2007-12-13 Aleksandr Georgievich Kamanin Detonation internal combustion engine with a floating piston and a method for the control thereof
US10519854B2 (en) 2015-11-20 2019-12-31 Tenneco Inc. Thermally insulated engine components and method of making using a ceramic coating
US10578050B2 (en) 2015-11-20 2020-03-03 Tenneco Inc. Thermally insulated steel piston crown and method of making using a ceramic coating

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE374591C (en) * 1921-05-29 1923-04-28 Gersham Bowmar Piston with a vacuum chamber arranged in the cavity of the piston body
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
JPS60164648A (en) * 1984-02-06 1985-08-27 Akita:Kk Piston structure for internal-combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE374591C (en) * 1921-05-29 1923-04-28 Gersham Bowmar Piston with a vacuum chamber arranged in the cavity of the piston body
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
JPS60164648A (en) * 1984-02-06 1985-08-27 Akita:Kk Piston structure for internal-combustion engine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4022508A1 (en) * 1990-07-14 1992-01-16 Mahle Gmbh IC engine piston with variable compression height
DE4022508C2 (en) * 1990-07-14 1999-07-15 Mahle Gmbh Plunger with variable compression height
WO2007142556A2 (en) * 2006-06-06 2007-12-13 Aleksandr Georgievich Kamanin Detonation internal combustion engine with a floating piston and a method for the control thereof
WO2007142556A3 (en) * 2006-06-06 2008-09-04 Aleksandr Georgievich Kamanin Detonation internal combustion engine with a floating piston and a method for the control thereof
US10519854B2 (en) 2015-11-20 2019-12-31 Tenneco Inc. Thermally insulated engine components and method of making using a ceramic coating
US10578050B2 (en) 2015-11-20 2020-03-03 Tenneco Inc. Thermally insulated steel piston crown and method of making using a ceramic coating

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8125 Change of the main classification

Ipc: F02F 3/00

8130 Withdrawal