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EP1761698A1 - Assembled piston for an internal combustion engine - Google Patents

Assembled piston for an internal combustion engine

Info

Publication number
EP1761698A1
EP1761698A1 EP05766511A EP05766511A EP1761698A1 EP 1761698 A1 EP1761698 A1 EP 1761698A1 EP 05766511 A EP05766511 A EP 05766511A EP 05766511 A EP05766511 A EP 05766511A EP 1761698 A1 EP1761698 A1 EP 1761698A1
Authority
EP
European Patent Office
Prior art keywords
piston
screw
external thread
recess
thread
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Withdrawn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
EP05766511A
Other languages
German (de)
French (fr)
Inventor
Rainer Scharp
Peter Kemnitz
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
Publication of EP1761698A1 publication Critical patent/EP1761698A1/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Withdrawn legal-status Critical Current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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • F16B5/0275—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread the screw-threaded element having at least two axially separated threaded portions
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/02—Shape of thread; Special thread-forms

Definitions

  • the invention relates to a piston built for an internal combustion engine according to the preamble of claim 1
  • a built-in piston is known from DE Auslegeschrift 22 12 922, which consists of an upper part and a lower part.
  • the two piston parts are connected to one another by means of an Allen screw, which consists of a bolt head and a bolt shaft, the bolt head having an external thread opposite the bolt shaft Da
  • Allen screw which consists of a bolt head and a bolt shaft, the bolt head having an external thread opposite the bolt shaft Da
  • the strength of a screw connection is greater, the smaller the pitch angle of the screw thread, and the relevant pitch angle for the screw connection known from the above prior art results from the sum of the pitch angles of the two opposing external threads, this screw connection has a very small one Firmness on
  • the object of the present invention is to avoid this disadvantage of the prior art, ie to create a permanently fixed screw connection between the upper part and the lower part of a constructed piston
  • a useful embodiment of the invention is the subject of the dependent claim, wherein an area around a through hole with a thread is so thin-walled that it is eder-like elastic plate and deforms when the hexagon socket screw is screwed into the through hole to the extent that this increases the strength of the screw connection Bias is generated
  • the figure shows a constructed piston 1 in a sectional view, the left half of which shows a section through the piston 1 along a longitudinal axis 2 of a hub bore 3 and the right half of which shows a section through the piston 1 offset by 90 °.
  • the piston 1 consists of an upper part 4 and a lower part 5, which are connected to one another by means of a centrally arranged hexagon socket screw 6 such that the hexagon socket 42 of the hexagon socket screw 6 comes to rest on the inside of the piston
  • the upper part 4 and the lower part 5 of the piston 1 are preferably made from forged steel. However, it is also conceivable to produce the upper part 4 from steel and the lower part 5 from aluminum or the upper part 4 from forged aluminum and the lower part from cast aluminum
  • the cylindrical upper part 4 forms the piston crown 7, into which a rotationally symmetrical combustion bowl 8 is molded lying lateral surface of the upper part 4 is formed as a ring portion 9, which has three annular grooves 10, 1 1 and 12 for receiving piston rings, not shown in the figure.
  • the underside of the upper part 4 facing away from the piston crown 7 has a circumferential recess 13 radially outside, which together with a corresponding, piston-bottom recess 14 of the lower part 5 forms an annular, outer cooling channel 15, which is delimited radially on the outside by an annular wall 29 molded onto the piston head 7
  • the outer cooling channel 15 is partly delimited by an annular flange 16 arranged on the underside of the upper part 4 and partly by an annular rib 17 arranged on the upper side of the lower part 5, the upper part 4 and the lower part 5 of the piston 1 via the ring flange 16 and the annular rib 17 rest on one another.
  • the annular flange 16 has a first contact surface 18 and the annular rib 17 has a second contact surface 19, via which contact surfaces 18, 19 the annular flange 16 and the annular rib 17 are in contact with one another
  • the upper part 4 Radially inside the ring flange 16, the upper part 4 is provided on its underside with a further, circumferential recess 20, which forms an inner, annular cooling channel 22 with a corresponding further recess 21 formed in the upper side of the lower part 5.
  • the outer cooling channel 15 Via an oil inlet opening 23 to the piston interior 24 and via an oil channel 25 to the inner cooling channel 22 Via an oil outlet opening 26, the inner cooling channel 22 is connected to the piston interior 24
  • oil is introduced into the oil via an oil inlet opening (not shown in the figure)
  • the outer cooling channel 15 is injected, after some time reaches the inner cooling channel 22 via the oil channel 25 and runs back into the piston interior 24 via the oil drain openings 23 and 26
  • the lower part 5 of the piston 1 consists of two opposing, in cross-section trapezoidal pin bosses 27, 27 ', each with a pin hole, 3, 3', which are arranged at such a distance from one another that the The upper part of a connecting rod (not shown in the figure) has space. Furthermore, the lower part 5 has the shaft elements 41, 41 'connecting the pin bosses 27, 27' to one another on the piston head side on the face of the annular wall 29 facing away from the piston crown fits recess 30 arranged radially on the inside, so that when the piston 1 is assembled, the lower part 5 is guided over the collar 28 and the recess 30 and centered relative to the upper part 4
  • the recess 14 which forms the outer cooling channel 15 with the recess 13 of the upper part 4, the annular rib 17 and the further recess 21, which connects with the further recess 20, adjoins the collar 28 radially inward of the upper part 4 forms the inner cooling channel 22.
  • the recess 21 is machined into the lower piston part 5 to such an extent that a thin-walled area 43 is formed between the piston interior 24 and the recess 21, which is of elastic spring type
  • a blind hole 32 with an internal thread 33 and into the upper side of the lower part 5, that is, a through hole 34 with a thread 35 running in the same direction as the internal thread 33 is machined into the underside of the piston head 7, whereby the pitch angle of the internal thread 33 is greater than the pitch angle of the thread 35.
  • the inside diameter of the blind hole 32 is 1/2 mm to 1 mm smaller than the inside diameter of the through hole 34
  • the hexagon socket screw 6 consisting of an upper 37 and a lower halves 38
  • the upper part 4 is screwed to the lower part 5
  • the upper screw halves 37 having such a diameter and such an external thread 39 that it can be screwed into the blind hole 32
  • the lower screw halve 38 has such a diameter and such an external thread that it can be screwed into the through hole 34
  • the diameter of the upper screw 37 is 1/2 mm to 1 mm smaller than that of the lower screw 38
  • the external thread 39 of the upper screw 37 has a larger pitch angle than that of the lower screw 38
  • the hexagon socket screw 6 When screwing the upper part 4 to the lower part 5 of the piston 1, the hexagon socket screw 6 is first screwed into the through hole 34 from below via the external thread 40 of its lower half 38 such that the upper half 37 of the hexagon socket screw 6 protrudes from the through hole 34 Then the upper part 4 is placed on the lower part 5 such that the upper and lower parts of the piston 1 are arranged in a certain position relative to one another and that the external thread 39 of the upper half 37 of the hexagon socket screw 6 comes into contact with the blind hole 32 of the upper part 4 Further rotation of the hexagon socket screw 6, because of the larger pitch angle of the external thread 39 of the upper half 37 of the screw 6 compared to the pitch angle of the external thread 40 of the lower half 38 of the screw 6, means that the 1 contact surface 18 of the upper part 4 is more in contact with the 2 contact surface 19 of the lower part 5 arrives as the external thread 40 of the lower half 38 of the screw 6 is completely screwed into the thread 35 of the through hole 34
  • the upper and lower parts of the piston 1 are formed in the area near the bores 32 and 34 so that there is a gap between the upper and lower parts here without screwing. If the upper and lower parts are screwed together, the torque exerted on the screw 6 is increased, after the surfaces 18 and 19 have come into contact with one another, this results in a deformation of the plate spring-like region 43, which leads to a reduction in the gap between the upper and lower parts of the piston and to a preload exerted by the deformed region 43 on the screw connection, which one Solidification of the screw connection according to the invention entails
  • a further improvement in the strength of the screw connection results from the fact that the self-locking of a screw preventing the loosening of a screw connection is greater, the lower the pitch angle of the screw thread 33 of the blind hole 32 and the thread 35 of the through hole 34, or between the external thread 39 of the upper half 37 and the external thread 40 of the lower half 38 of the hexagon socket screw 6 can be calculated. This difference is very small, which brings about a

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The invention relates to an assembled piston (1) for an internal combustion engine, said piston consisting of an upper part (4) and a lower part (5) that are interconnected by means of an internal hexagon screw (6) consisting of an upper half (37) and a lower half (38). The upper half (37) of the internal hexagon screw (6) comprises an external thread (39) which is parallel to the external thread (40) of the lower screw half (38) and has a larger lead angle than the same (40). The lead angle resulting from the difference between the lead angles of the two external threads (39, 40) is very small and contributes to a high strength of the screw connection.

Description

Gebauter Kolben für einen Verbrennungsmotor Built piston for an internal combustion engine
Die Erfindung betrifft einen gebauten Kolben für einen Verbrennungsmotor nach dem Oberbegriff des Anspruches 1The invention relates to a piston built for an internal combustion engine according to the preamble of claim 1
Aus der DE Auslegeschrift 22 12 922 ist ein gebauter Kolben bekannt, der aus einem Oberteil und einem Unterteil besteht Die beiden Kolbenteile sind mittels einer Innensechskantschraube miteinander verbunden, die aus einem Bolzenkopf und einem Bolzenschaft besteht, wobei der Bolzenkopf ein zum Bolzenschaft gegenläufiges Außengewinde aufweist Da allgemein die Festigkeit einer Schraubenverbindung um so großer ist, je geringer der Steigungswinkel des Schraubengewindes ist, und sich der diesbezüglich ausschlaggebende Steigungswinkel bei der aus obigem Stand der Technik bekannten Schraubverbindung aus der Summe der Steigungswinkel der beiden gegenläufigen Außengewinde ergibt, weist diese Schraubverbindung eine sehr geringe Festigkeit aufA built-in piston is known from DE Auslegeschrift 22 12 922, which consists of an upper part and a lower part.The two piston parts are connected to one another by means of an Allen screw, which consists of a bolt head and a bolt shaft, the bolt head having an external thread opposite the bolt shaft Da In general, the strength of a screw connection is greater, the smaller the pitch angle of the screw thread, and the relevant pitch angle for the screw connection known from the above prior art results from the sum of the pitch angles of the two opposing external threads, this screw connection has a very small one Firmness on
Diesen Nachteil des Standes der Technik zu vermeiden, d h , eine dauerhaft feste Schraubverbindung zwischen dem Oberteil und dem Unterteil eines gebauten Kolbens zu schaffen, ist Aufgabe der vorliegenden ErfindungThe object of the present invention is to avoid this disadvantage of the prior art, ie to create a permanently fixed screw connection between the upper part and the lower part of a constructed piston
Gelost wird diese Aufgabe mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen, wobei eine Innensechskantschraube mit einem aus zwei Hälften bestehenden Gewinde verwendet wird, die gleichläufig ausgebildet sind und unterschiedliche Steigungswinkel aufweisen, sodass der hierbei für die Festigkeit der Schraubverbindung ausschlaggebende Steigungswinkel aus der Differenz der Steigungswinkel der beiden Gewindehalften berechenbar ist, die sehr gering ist, sodass sich hierdurch eine relativ große Festigkeit der Schraubverbindung ergibtThis task is solved with the features in the characterizing part of the main claim, whereby an Allen screw with a thread consisting of two halves is used, which are of the same design and have different pitch angles, so that the pitch angle, which is decisive for the strength of the screw connection, from the difference of The lead angle of the two thread halves can be calculated, which is very small, so that this results in a relatively high strength of the screw connection
Eine zweckmäßige Ausgestaltung der Erfindung ist Gegenstand des Unteranspruches, wobei ein Bereich um eine Durchgangsbohrung mit Gewinde derart dünnwandig ausgebildet ist, dass er teller ederartig elastisch ist und sich beim Einschrauben der Innensechskantschraube in die Durchgangsbohrung insoweit verformt, dass dadurch auf die Schraubverbindung eine deren Festigkeit erhöhende Vorspannung erzeugt wirdA useful embodiment of the invention is the subject of the dependent claim, wherein an area around a through hole with a thread is so thin-walled that it is eder-like elastic plate and deforms when the hexagon socket screw is screwed into the through hole to the extent that this increases the strength of the screw connection Bias is generated
Ein Ausfuhrungsbeispiel der Erfindung wird im Folgenden anhand einer Zeichnung beschrieben Sie zeigt einen aus einem Oberteil und einem Unterteil bestehenden, gebauten Kolben in einem aus zwei Hälften bestehenden Schnittbild, das zwei um 90° versetzte Längsschnitte des Kolbens zeigtAn exemplary embodiment of the invention is described below with reference to a drawing. It shows a built-up piston consisting of an upper part and a lower part in a sectional view consisting of two halves, which shows two longitudinal sections of the piston offset by 90 °
Die Figur zeigt einen gebauten Kolben 1 in einem Schnittbild, dessen linke Hälfte einen Schnitt durch den Kolben 1 entlang einer Langsachse 2 einer Nabenbohrung 3 und dessen rechte Hälfte einen um 90° dazu versetzten Schnitt durch den Kolben 1 zeigt Der Kolben 1 besteht aus einem Oberteil 4 und einem Unterteil 5, die mittels einer mittig angeordneten Innensechskantschraube 6 so miteinander verbunden sind, dass der Innensechskant 42 der Innensechskantschraube 6 auf der Kolbeninnenseite zu liegen kommtThe figure shows a constructed piston 1 in a sectional view, the left half of which shows a section through the piston 1 along a longitudinal axis 2 of a hub bore 3 and the right half of which shows a section through the piston 1 offset by 90 °. The piston 1 consists of an upper part 4 and a lower part 5, which are connected to one another by means of a centrally arranged hexagon socket screw 6 such that the hexagon socket 42 of the hexagon socket screw 6 comes to rest on the inside of the piston
Hergestellt werden das Oberteil 4 und das Unterteil 5 des Kolbens 1 bevorzugterweise aus geschmiedetem Stahl Es ist aber auch denkbar, das Oberteil 4 aus Stahl und das Unterteil 5 aus Aluminium beziehungsweise das Oberteil 4 aus geschiedetem Aluminium und das Unterteil aus gegossenem Aluminium herzustellenThe upper part 4 and the lower part 5 of the piston 1 are preferably made from forged steel. However, it is also conceivable to produce the upper part 4 from steel and the lower part 5 from aluminum or the upper part 4 from forged aluminum and the lower part from cast aluminum
Das zylinderformige Oberteil 4 bildet den Kolbenboden 7, in den eine rotationssymmetrische Verbrennungsmulde 8 eingeformt ist Die radial außen liegende Mantelflache des Oberteiles 4 ist als Ringpartie 9 ausgebildet, die drei Ringnuten 10, 1 1 und 12 zur Aufnahme von in der Figur nicht dargestellten Kolbenringen aufweist Die dem Kolbenboden 7 abgewandte Unterseite des Oberteils 4 weist radial außen eine umlaufende Ausnehmung 13 auf, die gemeinsam mit einer entsprechenden, kolbenbodenseitigen Ausnehmung 14 des Unterteils 5 einen ringförmigen, äußeren Kuhlkanal 15 bildet, der radial außen von einer an den Kolbenboden 7 angeformten Ringwand 29 begrenzt wirdThe cylindrical upper part 4 forms the piston crown 7, into which a rotationally symmetrical combustion bowl 8 is molded lying lateral surface of the upper part 4 is formed as a ring portion 9, which has three annular grooves 10, 1 1 and 12 for receiving piston rings, not shown in the figure. The underside of the upper part 4 facing away from the piston crown 7 has a circumferential recess 13 radially outside, which together with a corresponding, piston-bottom recess 14 of the lower part 5 forms an annular, outer cooling channel 15, which is delimited radially on the outside by an annular wall 29 molded onto the piston head 7
Radial innen ist der äußere Kuhlkanal 15 zum Teil von einem auf der Unterseite des Oberteils 4 angeordneten Ringflansch 16 und zum Teil von einer auf der Oberseite des Unterteils 5 angeordneten Ringrippe 17 begrenzt, wobei das Oberteil 4 und das Unterteil 5 des Kolbens 1 über den Ringflansch 16 und die Ringrippe 17 aufeinander aufliegen Hierbei weisen der Ringflansch 16 eine erste Auflageflachen 18 und die Ringrippe 17 eine zweite Auflageflache 19 auf, über welche Auflageflachen 18, 19 der Ringflansch 16 und die Ringrippe 17 in Kontakt zueinander stehenRadially on the inside, the outer cooling channel 15 is partly delimited by an annular flange 16 arranged on the underside of the upper part 4 and partly by an annular rib 17 arranged on the upper side of the lower part 5, the upper part 4 and the lower part 5 of the piston 1 via the ring flange 16 and the annular rib 17 rest on one another. Here, the annular flange 16 has a first contact surface 18 and the annular rib 17 has a second contact surface 19, via which contact surfaces 18, 19 the annular flange 16 and the annular rib 17 are in contact with one another
Radial innerhalb des Ringflansches 16 ist das Oberteil 4 auf seiner Unterseite mit einer weiteren, umlaufenden Ausnehmung 20 versehen, die mit einer entsprechenden, in die Oberseite des Unterteiles 5 eingeformten, weiteren Ausnehmung 21 einen inneren, ringförmigen Kuhlkanal 22 bildet Hierbei ist der äußere Kuhlkanal 15 über eine Olzulaufoffnung 23 mit dem Kolbeninnenraum 24 und über einen Olkanal 25 mit dem inneren Kuhlkanal 22 verbunden Über eine Olablaufoffnung 26 ist der innere Kuhlkanal 22 mit dem Kolbeninnenraum 24 verbunden Zum Kuhlen des Kolbens 1 wird Ol über eine in der Figur nicht dargestellte Olzulaufoffnung in den äußeren Kuhlkanal 15 eingespritzt, gelangt nach einiger Zeit über den Olkanal 25 in den inneren Kuhlkanal 22 und lauft über die Olablaufoffnungen 23 und 26 wieder zurück in den Kolbeninnenraum 24Radially inside the ring flange 16, the upper part 4 is provided on its underside with a further, circumferential recess 20, which forms an inner, annular cooling channel 22 with a corresponding further recess 21 formed in the upper side of the lower part 5. Here, the outer cooling channel 15 Via an oil inlet opening 23 to the piston interior 24 and via an oil channel 25 to the inner cooling channel 22 Via an oil outlet opening 26, the inner cooling channel 22 is connected to the piston interior 24 For cooling the piston 1, oil is introduced into the oil via an oil inlet opening (not shown in the figure) The outer cooling channel 15 is injected, after some time reaches the inner cooling channel 22 via the oil channel 25 and runs back into the piston interior 24 via the oil drain openings 23 and 26
Das Unterteil 5 des Kolbens 1 besteht aus zwei einander gegenüberliegenden, im Schnitt trapezförmigen Bolzennaben 27, 27' mit je einer Bolzenbohrung, 3, 3', die in einem derartigen Abstand zueinander angeordnet sind, dass dazwischen das Oberteil eines (in der Figur nicht dargestellten) Pleuels Platz findet Weiterhin weist das Unterteil 5 die Bolzennaben 27, 27' miteinander verbindende Schaftelemente 41 , 41 ' auf Kolbenbodenseitig weist das Unterteil 5 radial außen einen umlaufenen im Schnitt rechteckformigen Kragen 28 auf, der in eine auf der kolbenbodenab- gewandten Stirnseite der Ringwand 29 radial innen angeordneten Ausnehmung 30 passt, sodass bei der Montage des Kolbens 1 das Unterteil 5 über den Kragen 28 und die Ausnehmung 30 gefuhrt und relativ zum Oberteil 4 zentriert wirdThe lower part 5 of the piston 1 consists of two opposing, in cross-section trapezoidal pin bosses 27, 27 ', each with a pin hole, 3, 3', which are arranged at such a distance from one another that the The upper part of a connecting rod (not shown in the figure) has space. Furthermore, the lower part 5 has the shaft elements 41, 41 'connecting the pin bosses 27, 27' to one another on the piston head side on the face of the annular wall 29 facing away from the piston crown fits recess 30 arranged radially on the inside, so that when the piston 1 is assembled, the lower part 5 is guided over the collar 28 and the recess 30 and centered relative to the upper part 4
Auf der kolbenbodenseitigen Oberflache des Unterteils 5 schließt sich nach radial innen an den Kragen 28 die Ausnehmung 14, die mit der Ausnehmung 13 des Oberteiles 4 den äußeren Kuhlkanal 15 bildet, die Ringrippe 17 und die weitere Ausnehmung 21 an, die mit der weiteren Ausnehmung 20 des Oberteiles 4 den inneren Kuhlkanal 22 bildet Hierbei ist die Ausnehmung 21 so weit in das Kolbenunterteil 5 eingearbeitet, dass ein dünnwandiger Bereich 43 zwischen Kolbeninnenraum 24 und Ausnehmung 21 entsteht, der tellerfederart elastisch ausgebildet istOn the piston-bottom-side surface of the lower part 5, the recess 14, which forms the outer cooling channel 15 with the recess 13 of the upper part 4, the annular rib 17 and the further recess 21, which connects with the further recess 20, adjoins the collar 28 radially inward of the upper part 4 forms the inner cooling channel 22. Here, the recess 21 is machined into the lower piston part 5 to such an extent that a thin-walled area 43 is formed between the piston interior 24 and the recess 21, which is of elastic spring type
Koaxial zur Langsachse 31 des Kolbens 1 ist in die Unterseite des Kolbenbodens 7 eine Sacklochbohrung 32 mit Innengewinde 33 und in die Oberseite des Unterteils 5, d h , in den elastisch nachgiebigen Bereich 43 eine Durchgangsbohrung 34 mit einem zum Innengewinde 33 gleichläufigen Gewinde 35 eingearbeitet, wobei der Steigungswinkel des Innengewindes 33 großer ist als der Steigungswinkel des Gewindes 35 Zudem ist der Innendurchmesser der Sacklochbohrung 32 um 1/2 mm bis 1 mm kleiner als der Innendurchmesser der Durchgangsbohrung 34Coaxial to the longitudinal axis 31 of the piston 1, a blind hole 32 with an internal thread 33 and into the upper side of the lower part 5, that is, a through hole 34 with a thread 35 running in the same direction as the internal thread 33 is machined into the underside of the piston head 7, whereby the pitch angle of the internal thread 33 is greater than the pitch angle of the thread 35. In addition, the inside diameter of the blind hole 32 is 1/2 mm to 1 mm smaller than the inside diameter of the through hole 34
Mit Hilfe der aus einer oberen 37 und einer unteren Hälften 38 bestehenden Innensechskantschraube 6 wird das Oberteil 4 mit dem Unterteil 5 verschraubt, wobei die obere Schraubenhalfte 37 einen solchen Durchmesser und ein solches Außengewinde 39 aufweist, dass sie in die Sacklochbohrung 32 einschraubbar ist, und die untere Schraubenhalfte 38 einen solchen Durchmesser und ein solches Außengewinde aufweist, dass sie in die Durchgangsbohrung 34 einschraubbar ist Demzufolge ist der Durchmesser der oberen Schraubenhalfte 37 um 1/2 mm bis 1 mm kleiner als derjenige der unteren Schraubenhalfte 38, und weist das Außengewinde 39 der oberen Schraubenhalfte 37 einen größeren Steigungswinkel auf als dasjenige der unteren Schraubenhalfte 38With the aid of the hexagon socket screw 6 consisting of an upper 37 and a lower halves 38, the upper part 4 is screwed to the lower part 5, the upper screw halves 37 having such a diameter and such an external thread 39 that it can be screwed into the blind hole 32, and the lower screw halve 38 has such a diameter and such an external thread that it can be screwed into the through hole 34 Accordingly, the diameter of the upper screw 37 is 1/2 mm to 1 mm smaller than that of the lower screw 38, and the external thread 39 of the upper screw 37 has a larger pitch angle than that of the lower screw 38
Beim Verschrauben des Oberteils 4 mit dem Unterteil 5 des Kolbens 1 , wird die Innensechskantschraube 6 über das Außengewinde 40 ihrer unteren Hälfte 38 zunächst von unten ein solches Stuck in die Durchgangsbohrung 34 eingeschraubt, dass die obere Hälfte 37 der Innensechkantschraube 6 aus der Durchgangsbohrung 34 herausragt Anschließend wird das Oberteil 4 auf das Unterteil 5 so aufgesetzt, dass Ober- und Unterteil des Kolbens 1 in einer bestimmten Stellung zueinander angeordnet sind, und dass das Außengewinde 39 der oberen Hälfte 37 der Innensechskantschraube 6 in Beruhrkontakt zur Sacklochbohrung 32 des Oberteils 4 kommt Eine weitere Drehung der Innensechskantschraube 6 bewirkt wegen des größeren Steigungswinkels des Außengewindes 39 der oberen Hälfte 37 der Schraube 6 gegenüber dem Steigungswinel des Außengewindes 40 der unteren Hälfte 38 der Schraube 6, dass die 1 Auflageflache 18 des Oberteils 4 eher in Anlage an die 2 Auflageflache 19 des Unterteils 5 gelangt, als das Außengewinde 40 der unteren Hälfte 38 der Schraube 6 vollständig in das Gewinde 35 der Durchgangsbohrung 34 eingeschraubt istWhen screwing the upper part 4 to the lower part 5 of the piston 1, the hexagon socket screw 6 is first screwed into the through hole 34 from below via the external thread 40 of its lower half 38 such that the upper half 37 of the hexagon socket screw 6 protrudes from the through hole 34 Then the upper part 4 is placed on the lower part 5 such that the upper and lower parts of the piston 1 are arranged in a certain position relative to one another and that the external thread 39 of the upper half 37 of the hexagon socket screw 6 comes into contact with the blind hole 32 of the upper part 4 Further rotation of the hexagon socket screw 6, because of the larger pitch angle of the external thread 39 of the upper half 37 of the screw 6 compared to the pitch angle of the external thread 40 of the lower half 38 of the screw 6, means that the 1 contact surface 18 of the upper part 4 is more in contact with the 2 contact surface 19 of the lower part 5 arrives as the external thread 40 of the lower half 38 of the screw 6 is completely screwed into the thread 35 of the through hole 34
Hierbei sind Ober- und Unterteil des Kolbens 1 im Bereich nahe den Bohrungen 32 und 34 so ausgebildet, dass sich hier ohne Schraubzwang eine Lücke zwischen Ober- und Unterteil ergibt Wird beim Zusammenschrauben von Ober- und Unterteil das auf die Schraube 6 ausgeübte Drehmoment erhöht, nachdem die Flachen 18 und 19 in Kontakt zueinander getreten sind, ergibt sich hierdurch eine Verformung des tellerfederartigen Bereiches 43, die zu einer Verkleinerung der Lücke zwischen Kolbenober- und -unterteil und zu einer vom verformten Bereich 43 auf die Schraubverbindung ausgeübten Vorspannung fuhrt, die einer Verfestigung der erfindungsgemaßen Schraubverbindung mit sich bringt Eine weitere Verbesserung der Festigkeit der Schraubverbindung ergibt sich dadurch, dass die das Losen einer Schraubverbindung verhindernde Selbsthemmung einer Schraube um so großer ist, je geringer der Steigungswinkel des Schraubengewindes ist Der bei der erfindungsgemaßen Schraubverbindung diesbezüglich ausschlaggebende Steigungswinkel ist aus der Differenz der Steigungswinkel zwischen dem Innengewinde 33 der Sacklochbohrung 32 und dem Gewinde 35 der Durchgangsbohrung 34, beziehungsweise zwischen dem Außengewinde 39 der obereren Hälfte 37 und dem Außengewinde 40 der unteren Hälfte 38 der Innensechskantschraube 6 berechenbar Diese Differenz ist sehr gering, was die weitere Verbesserung der Festigkeit der erfindungsgemaßen Schraubverbindung bewirkt Here, the upper and lower parts of the piston 1 are formed in the area near the bores 32 and 34 so that there is a gap between the upper and lower parts here without screwing. If the upper and lower parts are screwed together, the torque exerted on the screw 6 is increased, after the surfaces 18 and 19 have come into contact with one another, this results in a deformation of the plate spring-like region 43, which leads to a reduction in the gap between the upper and lower parts of the piston and to a preload exerted by the deformed region 43 on the screw connection, which one Solidification of the screw connection according to the invention entails A further improvement in the strength of the screw connection results from the fact that the self-locking of a screw preventing the loosening of a screw connection is greater, the lower the pitch angle of the screw thread 33 of the blind hole 32 and the thread 35 of the through hole 34, or between the external thread 39 of the upper half 37 and the external thread 40 of the lower half 38 of the hexagon socket screw 6 can be calculated. This difference is very small, which brings about a further improvement in the strength of the screw connection according to the invention
BezuqszeichenlisteLIST OF REFERENCES
1 Kolben1 piston
2 Längsachse2 longitudinal axis
3, 3' Nabenbohrung Oberteil3, 3 'hub bore upper part
5 Unterteil5 lower part
6 Innensechskantschraube6 Allen screw
7 Kolbenboden7 piston crown
8 Verbrennungsmulde8 combustion bowl
9 Ringpartie9 ring section
10, 1 1 , 12 Ringnut10, 1 1, 12 ring groove
13, 14 Ausnehmung13, 14 recess
15 äußerer Kühlkanal15 outer cooling duct
16 Ringflansch16 ring flange
17 Ringrippe17 ring rib
18 1. Auflagefläche18 1. Contact surface
19 2. Auflagefläche 0, 21 Ausnehmung 2 innerer Kühlkanal19 2nd contact surface 0, 21 recess 2 inner cooling channel
23 Ölablauföffnung23 Oil drain opening
24 Kolbeninnenraum24 piston interior
25 Olkanal25 oil channel
26 Ölablauföffnung 7, 27' Bolzennabe 8 Kragen 9 Ringwand 0 Ausnehmung 1 Längsachse des Kolbens 1 2 Sacklochbohrung 3 Innengewinde der Sacklochbohrung 32 Durchgangsbohrung Gewinde der Durchgangsbohrung 34 obere Hälfte der Innensechskantschraube 6 untere Hälfte der Innensechskantschraube 6 Außengewinde der oberen Hälfte 37 der Innensechskantschraube 6 Außengewinde der unteren Hälfte 38 der Innensechskantschraube 6 Schaftelement Innensechskant tellerfederartiger Bereich zwischen der weiteren Ausnehmung 21 und dem Kolbeninnenraum 24 26 Oil drain opening 7, 27 'pin boss 8 collar 9 ring wall 0 recess 1 longitudinal axis of the piston 1 2 blind hole 3 internal thread of the blind hole 32 Through bore Thread of the through bore 34 upper half of the hexagon socket screw 6 lower half of the hexagon socket screw 6 external thread of the upper half 37 of the hexagon socket screw 6 external thread of the lower half 38 of the hexagon socket screw 6 shaft element hexagon socket disc-like area between the further recess 21 and the piston interior 24

Claims

Patentansprücheclaims
Gebauter Kolben (1 ) für einen VerbrennungsmotorBuilt piston (1) for an internal combustion engine
- bestehend aus einem den Kolbenboden (7) bildenden Oberteil (4), = mit einer auf der kolbenbodenabgewandten Unterseite angeordneten und drehsymmetrisch zur Kolbenlangsachse (31 ) umlaufenden Ausnehmung (20), und = mit einer auf der Unterseite und koaxial zur Kolbenlangsachse (31 ) angeordneten Sacklochbohrung (32) mit Innengewinder (33), und- consisting of an upper part (4) forming the piston crown (7), = with a recess (20) arranged on the underside facing away from the piston crown and rotating in a symmetrical manner with respect to the longitudinal piston axis (31), and = with a recess on the underside and coaxial with the longitudinal piston axis (31) arranged blind hole (32) with internal thread (33), and
- bestehend weiterhin aus einem Unterteil (5), = mit zwei auf der Unterseite im Abstand zueinander angeordneten Bolzennaben (27, 27') mit je einer Nabenbohrung (3, 3'), = mit die Bolzennaben (27, 27') miteinander verbindenden Schaftelementen (41 , 41 '), = mit einer auf der Oberseite angeordneten und drehsymmetrisch zur Kolbenlangsachse (31 ) umlaufenden Ausnehmung (21 ), die mit der Ausnehmung (20) des Oberteils (4) einen inneren Kuhlkanal (22) bildet, und = mit einer auf der Oberseite und koaxial zur Kolbenlangsachse (31 ) angeordneten Durchgangsbohrung (34) mit Gewinde (35),- Consisting of a lower part (5), = with two bolt hubs (27, 27 ') arranged on the underside, each with a hub bore (3, 3'), = with the bolt hubs (27, 27 ') connecting each other Shaft elements (41, 41 '), = with a recess (21) which is arranged on the upper side and rotates symmetrically to the piston longitudinal axis (31) and which forms an inner cooling channel (22) with the recess (20) of the upper part (4), and = with a through bore (34) with a thread (35) arranged on the top and coaxial to the piston longitudinal axis (31),
- wobei das Oberteil (4) und das Unterteil (5) mittels einer Innensechskantschraube (6) miteinander verbunden sind, die aus einer oberen Hälfte (37) und eine unteren Hälfte (38) mit je einem derart ausgebildeten Außengewinde (39, 40) besteht, dass das Außengewinde (39) der oberen Schraubenhalfte (37) in die Sacklochbohrung (32) und das Außengewinde (40) der unteren Schraubenhalfte (38) in die Durchgangsbohrung (34) einschraubbar sind, und dass der Durchmesser des Außengewindes (39) der oberen Schraubenhalfte (37) um ein solches Maß kleiner als der Durchmesser des Außengewindes (40) der unteren Schraubenhalfte (38) ist, dass die obere Schraubenhalfte (37) ungehindert durch die Durchgangsbohrung (40) hmdurchschiebbar ist, dadurch gekennzeichnet, - dass das Außengewinde (39) der oberen Schraubenhalfte (37) gleichläufig mit dem Außengewinde (40) der unteren Schraubenhalfte (38) ausgebildet ist, und - dass das Außengewinde (39) der oberen Schraubenhalfte (37) einen größeren Steigungswinkel aufweist als das Außengewinde (40) der unteren Schraubenhalfte (38)- The upper part (4) and the lower part (5) are connected to one another by means of an Allen screw (6) which consists of an upper half (37) and a lower half (38), each with an external thread (39, 40) formed in this way that the external thread (39) of the upper screw half (37) can be screwed into the blind hole (32) and the external thread (40) of the lower screw half (38) into the through hole (34), and that the diameter of the external thread (39) the upper screw half (37) is smaller than the diameter of the external thread (40) of the lower screw half (38) such that the upper screw half (37) can be pushed through the through hole (40) without hindrance, characterized in that - the external thread (39) of the upper screw halves (37) is formed in the same way as the external thread (40) of the lower screw halves (38), and - that the external thread (39) of the upper screw halves (37) has a larger pitch angle than the external thread (40) of the lower screw halves (38)
Gebauter Kolben nach Anspruch 1 , dadurch gekennzeichnet, dass das Kolbenunterteil (5) im Bereich (43) der Ausnehmung (21 ) derart dünnwandig ausgebildet ist, dass der Bereich (43) in der Art einer Tellerfeder elastisch nachgiebig ist A built-in piston according to claim 1, characterized in that the lower piston part (5) is thin-walled in the region (43) of the recess (21) such that the region (43) is resilient in the manner of a plate spring
EP05766511A 2004-06-19 2005-06-17 Assembled piston for an internal combustion engine Withdrawn EP1761698A1 (en)

Applications Claiming Priority (2)

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DE102004029877A DE102004029877A1 (en) 2004-06-19 2004-06-19 Built piston for an internal combustion engine
PCT/DE2005/001092 WO2005124136A1 (en) 2004-06-19 2005-06-17 Assembled piston for an internal combustion engine

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EP1761698A1 true EP1761698A1 (en) 2007-03-14

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US (1) US7464684B2 (en)
EP (1) EP1761698A1 (en)
JP (1) JP4809335B2 (en)
KR (1) KR20070043784A (en)
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KR20070043784A (en) 2007-04-25
US7464684B2 (en) 2008-12-16
JP4809335B2 (en) 2011-11-09
JP2008503676A (en) 2008-02-07
CN101018941B (en) 2010-06-09
US20080011262A1 (en) 2008-01-17
CN101018941A (en) 2007-08-15
WO2005124136A1 (en) 2005-12-29
DE102004029877A1 (en) 2006-01-05

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