WO2021073680A1 - Beam-like crosshead for a valve train of a heavy duty internal combustion engine - Google Patents

Beam-like crosshead for a valve train of a heavy duty internal combustion engine Download PDF

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Publication number
WO2021073680A1
WO2021073680A1 PCT/DE2020/100788 DE2020100788W WO2021073680A1 WO 2021073680 A1 WO2021073680 A1 WO 2021073680A1 DE 2020100788 W DE2020100788 W DE 2020100788W WO 2021073680 A1 WO2021073680 A1 WO 2021073680A1
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WO
WIPO (PCT)
Prior art keywords
bridge
longitudinal
crosshead
gas exchange
transverse wall
Prior art date
Application number
PCT/DE2020/100788
Other languages
German (de)
French (fr)
Inventor
David Lang
Stefan Dupke
Markus Wiedmann
Original Assignee
Schaeffler Technologies AG & Co. KG
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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Priority to CN202080061254.8A priority Critical patent/CN114364864A/en
Priority to DE112020004993.0T priority patent/DE112020004993A5/en
Priority to EP20775175.1A priority patent/EP4045774A1/en
Publication of WO2021073680A1 publication Critical patent/WO2021073680A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2301/00—Using particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements

Definitions

  • the invention relates to a bar-like bridge for a valve drive of a heavy-duty internal combustion engine for the transmission of a cam lift to two gas exchange valves that act in the same way,
  • which bridge is a one-piece, stamping and bending technology made of sheet steel hollow body with an inverted U-profile, formed by a transverse wall with from Side walls depending on their longitudinal edges, which transverse wall, starting from the longitudinal ends of the bridge, each have a plateau and at their Llindmit te a raised contact zone for an at least indirect cam counter-rotation, which plateaus are verbun with the contact zone via a roof section each, with an underside the transverse wall, at the longitudinal ends, each has a gas exchange valve contact surface.
  • a “heavy-duty internal combustion engine” is to be understood as a machine as it is used in particular to drive a truck, van, light transporter, agricultural equipment, ship, mining or construction site equipment, etc.
  • a bridge for a valve train of a heavy-duty internal combustion engine is shown in DE 20 2019 103 327 U1.
  • the gas exchange valve con tact surfaces are arranged on the underside of the plateaus.
  • the transverse wall is provided in the region of the longitudinal center with a right corner-like contact zone, which is connected to the plateaus via pieces of plate.
  • the task is to create a bridge as mentioned above, which is very inexpensive, easily builds and at the same time can be used between high vertical distances from its contact zone to the gas exchange valve surfaces.
  • this object is achieved in that the plateaus each have a rectangular channel-like central section which is lowered by deep-drawing relative to the longitudinal edges, the longitudinal walls of which with their outer surfaces are vertically in front of the inner sides of the transverse walls, the gas exchange selventiltim inhabit lying on the lower surfaces of the central sections of the plateaus, where in which the roof sections are spherical segment-like and the side walls at the longitudinal ends of the bridge taper off unconnected-free.
  • the high distance to be bridged between the contact zone for the at least indirect counter-cam on the upper side and the valve contact surfaces on the lower side of the transverse wall of the bridge is, while maintaining the generally inverted U-shape of the bridge, now cleverly lowered by the two rectangular channel-like lowered, post-shaped sections achieved plateaus.
  • the bridge should have a wall thickness of 2 - 10 mm, based on its base body without the lowered center cuts.
  • a thick sheet metal construction with a thickness of about 4-6 mm is particularly preferred here.
  • a downwardly curved guide tab can protrude from at least one longitudinal end, on the inside of which a gas exchange valve guide follows.
  • additional securing elements such as clips or the like can be attached in this area.
  • the contact zone on the top of the bridge circular. If necessary, the contact zone can also have an elliptical shape. It can also be spherically bulged and / or. re-embossed and / or be provided with an applied hard material layer.
  • FIG. 1 shows a three-dimensional view of the bridge in its general design after its first drawing step
  • Figure 2 shows the bridge as mentioned above, in the final representation with channels and molded into the plateau
  • Figure 3 shows a partial view of the bridge with an optional, end guide tab.
  • FIG. 2 shows a beam-like bridge 1 made of sheet steel for a valve drive of a heavy-duty internal combustion engine.
  • Bridge 1 is used to simultaneously transfer a cam lift to two gas exchange valves with the same effect and is Compared to a cylinder head of the internal combustion engine not guided on columns or the like.
  • the bridge 1 can be made of thick sheet metal with a wall thickness of 4 mm, but a total area of approximately 2-10 mm is intended.
  • the bridge 1 is stamped and bent in at least two successive drawing stages, with FIG. 1 showing the bridge 1 after its essential drawing stage in its U-shape which is inverted in cross-section.
  • the bridge 1 has an overhead transverse wall 3, from the longitudinal edges 9a side walls 4 depend.
  • the bridge 1 thus forms a hollow body.
  • the contact zone 6 has a recognizable circular shape and is slightly arched.
  • the transverse wall 3 has, starting from the longitudinal ends 8 of the bridge 1, a plateau 10 each. A connection of the plateaus 10 to the contact zone 6 is realized via easily deep-drawable, spherical segment-like roof sections 11.
  • FIG. 3 shows a variant in which a guide tab 17 is bent off at one or both ends of the bridge 1, via which an additional longitudinal fixation / guidance of the bridge 1 can take place on the gas exchange valves.
  • the bridge 1, with one size can be adapted to different valve spacings via different cut depths of the guide tabs 17 on the transverse wall 3.
  • FIG. 2 shows the bridge 1 after a supplementary drawing step which, if necessary, can also be integrated into the preceding drawing step described above.
  • Dem- According to each plateau 10 of the transverse wall 3 has a rectangular channel-like central section 12 that is lowered compared to the longitudinal edges 9a.
  • the arrows drawn in thick in FIGS. 1, 2 symbolize the essential drawing directions in the vertical Longitudinal walls 13 of the lowered middle sections 12 in sections with their outer surfaces 14 in front of inner sides 15 of the transverse walls 3. If necessary, a visibly larger distance can be selected between these in order to keep the bending stresses in check .
  • the two-ended gas exchange valve contact surfaces 9 run on lower surfaces 16 of the middle sections 12. Due to the lowered middle sections 12, comparatively high vertical distances between the counter-cam and the gas exchange valves can be "spanned" via the bridge 1, given its good deep-drawability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The invention relates to a beam-like crosshead (1) for a valve train of a heavy duty internal combustion engine for the transmission of a cam lift to two identically acting gas exchange valves, which crosshead (1) is a single-piece hollow body with a reversed U-shaped profile produced from sheet steel by stamping/bending, formed by a transverse wall (3) having side walls (4) hanging from the longitudinal edges (9a) thereof, which transverse wall (3), proceeding from each longitudinal end (8) of the crosshead (1), has a plateau (10), and at the longitudinal centre of the crosshead (1), has a raised contact zone (6) for an at least indirect cam counter-rotation, which plateaus (10) are each connected to the contact zone (6) via a roof portion (11), wherein: on an underside (7) of the transverse wall (3) at each of the longitudinal ends (8) there is a gas exchange valve contact surface (9); the plateaus (10) each have a rectangular channel-like central portion (12) which is sunken relative to the longitudinal edges (9a) by deep drawing and whose longitudinal walls (13) have outer surfaces (14) which face inner sides (15) of the transverse walls (3) over a portion of their height; the gas exchange valve contact surfaces (9) are located on lower surfaces (16) of the central portions (12) of the plateaus (10); the roof portions (11) are in the form of spherical segments; and the side walls (4) come to end in an unconnected manner at the longitudinal ends (8) of the crosshead (1).

Description

Balkenartiqe Brücke für einen Ventiltrieb einer Heavv-Dutv-Brennkraftmaschine Balkenartiqe bridge for a valve train of a Heavv-Dutv internal combustion engine
Die Erfindung betrifft eine balkenartige Brücke für einen Ventiltrieb einer Heavy-Duty- Brennkraftmaschine zur Übertragung eines Nockenhubes auf zwei gleichwirkende Gaswechselventile, welche Brücke ein einteiliger, stanz-biegetechnisch aus Stahl blech hergestellter Hohlkörper mit umgekehrtem U-Profil ist, gebildet durch eine Querwand mit von ihren Längsrändern abhängenden Seitenwänden, welche Quer wand, ausgehend von Längsenden der Brücke, je ein Plateau und bei ihrer Längsmit te eine abgehobene Kontaktzone für einen zumindest mittelbaren Nockengegenlauf aufweist, welche Plateaus mit der Kontaktzone über je einen Dachabschnitt verbun den sind, wobei an einer Unterseite der Querwand, bei den Längsenden, je eine Gas wechselventilkontaktfläche liegt. The invention relates to a bar-like bridge for a valve drive of a heavy-duty internal combustion engine for the transmission of a cam lift to two gas exchange valves that act in the same way, which bridge is a one-piece, stamping and bending technology made of sheet steel hollow body with an inverted U-profile, formed by a transverse wall with from Side walls depending on their longitudinal edges, which transverse wall, starting from the longitudinal ends of the bridge, each have a plateau and at their Längmit te a raised contact zone for an at least indirect cam counter-rotation, which plateaus are verbun with the contact zone via a roof section each, with an underside the transverse wall, at the longitudinal ends, each has a gas exchange valve contact surface.
Unter „Heavy-Duty-Brennkraftmaschine“ ist eine Maschine zu verstehen, wie sie ins besondere zum Antrieb eines Lkw, Transporters, Leichttransporters, landwirtschaftli chen Arbeitsgeräts, Schiffs, Bergbau- oder Baustellengeräts etc. verwendet wird. A “heavy-duty internal combustion engine” is to be understood as a machine as it is used in particular to drive a truck, van, light transporter, agricultural equipment, ship, mining or construction site equipment, etc.
Eine Brücke für einen Ventiltrieb einer Heavy-Duty-Brennkraftmaschine zeigt die DE 20 2019 103 327 U1. An Unterseiten deren Plateaus sind die Gaswechselventilkon taktflächen angeordnet. Die Querwand ist im Bereich der Längsmitte mit einer recht eckähnlichen Kontaktzone versehen, welche über Plattenstücke mit den Plateaus ver bunden ist. A bridge for a valve train of a heavy-duty internal combustion engine is shown in DE 20 2019 103 327 U1. On the underside of the plateaus, the gas exchange valve con tact surfaces are arranged. The transverse wall is provided in the region of the longitudinal center with a right corner-like contact zone, which is connected to the plateaus via pieces of plate.
Eine ähnliche Brücke wie zuvor genannt geht aus der DE 202019 101 904 U1 hervor. Hierbei sind die Seitenwände an den Längsenden der Brücke verbunden ausgeführt. A similar bridge as mentioned above emerges from DE 202019 101 904 U1. Here, the side walls are designed to be connected at the longitudinal ends of the bridge.
Eine weitere Brücke offenbart die DE 102010 011 455 A1 . Diese ist als Massivteil in Guss- oder Schmiedetechnik ausgebildet. Another bridge is disclosed in DE 102 010 011 455 A1. This is designed as a solid part using casting or forging technology.
Aufgabe ist es, eine Brücke wie vorgenannt zu kreieren, die sehr kostengünstig ist, leicht baut und zugleich zwischen hohen vertikalen Abstände von ihrer Kontaktzone zu den Gaswechselventilflächen eingesetzt werden kann. Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Plateaus jeweils über einen gegenüber den Längsrändern durch Tiefziehen abgesenkten, rechteckka nalähnlichen Mittenabschnitt verfügen, dessen Längswände mit ihren Außenflächen höhenabschnittsweise vor Innenseiten der Querwände stehen, wobei die Gaswech selventilkontaktflächen an Unterflächen der Mittenabschnitte der Plateaus liegen, wo bei die Dachabschnitte kugelsegmentartig sind und wobei die Seitenwände an den Längsenden der Brücke unverbundenen-frei auslaufen. The task is to create a bridge as mentioned above, which is very inexpensive, easily builds and at the same time can be used between high vertical distances from its contact zone to the gas exchange valve surfaces. According to the invention, this object is achieved in that the plateaus each have a rectangular channel-like central section which is lowered by deep-drawing relative to the longitudinal edges, the longitudinal walls of which with their outer surfaces are vertically in front of the inner sides of the transverse walls, the gas exchange selventilkontaktflächen lying on the lower surfaces of the central sections of the plateaus, where in which the roof sections are spherical segment-like and the side walls at the longitudinal ends of the bridge taper off unconnected-free.
Somit liegt eine preiswert durch Stanzen und Biegen erzielbare, vertikal bewegbare Brücke zum simultanen Öffnen zweier Gaswechselventile, ganz speziell für eine Ap plikation in einem Ventiltrieb einer Nutzkraftfahrzeug-Brennkraftmaschine oder einer anderen schwerbauenden Arbeitsmaschine, vor, der die erforderliche Steifigkeit im manent ist, die vergleichsweise leicht baut und die zugleich für hohe vertikale Einbau abstände taugt. Thus, there is a vertically movable bridge that can be achieved inexpensively by punching and bending for the simultaneous opening of two gas exchange valves, especially for an application in a valve train of a commercial vehicle internal combustion engine or another heavy-duty work machine, which has the required rigidity, which comparatively is easy to build and at the same time is suitable for high vertical installation distances.
Der hohe zu überbrückende Abstand zwischen der Kontaktzone für den zumindest mittelbaren Nockengegenlauf an der Oberseite und den Ventilkontaktflächen an der Unterseite der Querwand der Brücke ist, unter Beibehaltung der generell umgekehrten U-Form der Brücke, nunmehr geschickt durch die beiden rechteckkanalähnlich abge senkten, nachgeformten Abschnitte der Plateaus erzielt. The high distance to be bridged between the contact zone for the at least indirect counter-cam on the upper side and the valve contact surfaces on the lower side of the transverse wall of the bridge is, while maintaining the generally inverted U-shape of the bridge, now cleverly lowered by the two rectangular channel-like lowered, post-shaped sections achieved plateaus.
Einer Erhöhung einer Ziehtiefe der von der Oberseite abgehobenen Kontaktzone sind umformtechnische Grenzen gesetzt, Stichwort bspw. „Rissgefahr“. Im Querschnitt durch die Mittenabschnitte ergibt sich somit eine M-ähnliche Gestaltung mit „Dopp lung“ von Wandmaterial. Innenflächen der Längswände des jeweiligen Rechteckka nals dienen einer lateralen Führung des jeweiligen Gaswechselventils. Klar ist an die ser Stelle, dass die beiden Rechteckkänale auch muldenförmig oder dergleichen sein können. An increase in the drawing depth of the contact zone raised from the top is subject to forming limits, keyword, for example, “risk of cracking”. In the cross-section through the middle sections, this results in an M-like design with “doubling” of wall material. Inner surfaces of the longitudinal walls of the respective rectangle channel serve to guide the respective gas exchange valve laterally. It is clear at this point that the two rectangular channels can also be trough-shaped or the like.
Gemäß einer bevorzugten Fortbildung der Erfindung soll die Brücke eine Wandstärke 2 - 10 mm haben, bezogen auf ihren Grundkörper ohne die abgesenkten Mittenab- schnitte. Eine Dickblechausbildung mit einer Stärke von etwa 4 - 6 mm ist hierbei be sonders bevorzugt. According to a preferred development of the invention, the bridge should have a wall thickness of 2 - 10 mm, based on its base body without the lowered center cuts. A thick sheet metal construction with a thickness of about 4-6 mm is particularly preferred here.
Zugleich ist es vorgeschlagen, die Brücke an deren Längsenden „offen“ auslaufen zu lassen. Alternativ kann von wenigstens einem Längsende eine abwärts gebogene Führungslasche abstehen, an deren Innenseiten eine Gaswechselventilführung er folgt. Im Fall der „offenen“ Gestaltung können ggf. noch zusätzliche Sicherungsele mente wie Klips o. dergleichen in diesem Bereich angebracht werden. At the same time, it is proposed to let the bridge run out “open” at its longitudinal ends. Alternatively, a downwardly curved guide tab can protrude from at least one longitudinal end, on the inside of which a gas exchange valve guide follows. In the case of the “open” design, additional securing elements such as clips or the like can be attached in this area.
Außerdem ist es vorgeschlagen, die Kontaktzone an der Oberseite der Brücke kreis förmig zu gestalten. Ggf. kann die Kontaktzone auch einen elliptischen Verlauf haben. Sie kann zudem sphärisch ausgewölbt vorliegen u./o. nachgeprägt u./o. mit einer auf getragenen Hartstoffschicht versehen sein. It is also proposed to make the contact zone on the top of the bridge circular. If necessary, the contact zone can also have an elliptical shape. It can also be spherically bulged and / or. re-embossed and / or be provided with an applied hard material layer.
Liegt der freie, untere Rand der Seitenwände wie konkretisierend vorgeschlagen plan vor, ist ein Handling der Brücke erleichtert. Ggf. kann Letztgenannte im Mittenbereich auch abwärts ausgeformt sein, was u. U. die Steifigkeit erhöht und Material für den Tiefziehvorgang schafft. If the free, lower edge of the side walls is flat, as suggested in more concrete terms, handling of the bridge is made easier. If necessary, the latter can also be shaped downwards in the middle area, which under certain circumstances increases the rigidity and creates material for the deep-drawing process.
Zur Zeichnung: To the drawing:
• Figur 1 zeigt eine räumliche Ansicht der Brücke in ihrem generellen Design nach ihrem ersten Ziehschritt; FIG. 1 shows a three-dimensional view of the bridge in its general design after its first drawing step;
• Figur 2 zeigt die Brücke wie vorgenannt, in finaler Darstellung mit in die Pla teaus eingeformten Kanälen und • Figure 2 shows the bridge as mentioned above, in the final representation with channels and molded into the plateau
• Figur 3 zeigt eine Teilansicht der Brücke mit optionaler, endseitiger Führungs lasche. • Figure 3 shows a partial view of the bridge with an optional, end guide tab.
Aus Figur 2 geht eine balkenartige Brücke 1 aus Stahlblech für einen Ventiltrieb einer Heavy-Duty-Brennkraftmaschine hervor. Die Brücke 1 dient einer gleichzeitigen Über tragung eines Nockenhubes auf zwei gleichwirkende Gaswechselventile und wird ge- genüber einem Zylinderkopf der Brennkraftmaschine nicht an Säulen oder dergleichen geführt. FIG. 2 shows a beam-like bridge 1 made of sheet steel for a valve drive of a heavy-duty internal combustion engine. Bridge 1 is used to simultaneously transfer a cam lift to two gas exchange valves with the same effect and is Compared to a cylinder head of the internal combustion engine not guided on columns or the like.
Im Hinblick auf die im Heavy-Duty-Bereich auftretenden hohen Kräfte / Belastungen kann die Brücke 1 bspw. aus Dickblech mit einer Wandstärke von 4 mm vorliegen, wobei jedoch insgesamt an einen Bereich von etwa 2 - 10 mm gedacht ist. Die Brü cke 1 ist stanz-biegetechnisch in zumindest zwei aufeinanderfolgenden Ziehstufen ge fertigt, wobei Figur 1 die Brücke 1 nach ihrer wesentlichen Ziehstufe in ihrer im Quer schnitt umgekehrten U-Form zeigt. In view of the high forces / loads occurring in the heavy-duty area, the bridge 1 can be made of thick sheet metal with a wall thickness of 4 mm, but a total area of approximately 2-10 mm is intended. The bridge 1 is stamped and bent in at least two successive drawing stages, with FIG. 1 showing the bridge 1 after its essential drawing stage in its U-shape which is inverted in cross-section.
Die Brücke 1 hat eine obenliegende Querwand 3, von deren Längsrändern 9a Seiten wände 4 abhängen. Somit bildet die Brücke 1 einen Hohlkörper. Von einer Oberseite 5 der Querwand 3 steht bei einer Längsmitte der Brücke 1 eine abgehobene Kontakt zone 6 für einen Gegenlauf eines hier hebelartigen Nockenfolgers (Kipphebel, Schlepphebel) ab. Die Kontaktzone 6 hat erkennbar eine Kreisform und ist geringfügig ausgewölbt. Die Querwand 3 weist, ausgehend von Längsenden 8 der Brücke 1 , je ein Plateau 10 auf. Eine Anbindung der Plateaus 10 an die Kontaktzone 6 ist über gut tiefziehbare, kugelsegmentartige Dachabschnitte 11 realisiert. The bridge 1 has an overhead transverse wall 3, from the longitudinal edges 9a side walls 4 depend. The bridge 1 thus forms a hollow body. From an upper side 5 of the transverse wall 3, at a longitudinal center of the bridge 1, there is a raised contact zone 6 for a counter-rotation of a here lever-like cam follower (rocker arm, rocker arm). The contact zone 6 has a recognizable circular shape and is slightly arched. The transverse wall 3 has, starting from the longitudinal ends 8 of the bridge 1, a plateau 10 each. A connection of the plateaus 10 to the contact zone 6 is realized via easily deep-drawable, spherical segment-like roof sections 11.
An einer Unterseite 7 der vorgenannten Querwand 3 ist vor den sich gegenüberlie genden Längsenden 8 je eine Gaswechselventilkontaktfläche 9 gebildet (s. u.). Über Innenseiten 14 der Seitenwände 4 erfolgt eine Führung der Brücke 1 an den Schäften der Gaswechselventile im Verbau. In diesem Kontext geht aus Figur 3 eine Variante hervor, bei welcher ein- oder beidendig der Brücke 1 eine Führungslasche 17 abge bogen ist, über welche eine zusätzliche Längsfixierung / -führung der Brücke 1 an den Gaswechselventilen erfolgen kann. Hierbei kann die Brücke 1 , bei einer Baugröße, über unterschiedliche Anschnitttiefen der Führungslaschen 17 an der Querwand 3 an unterschiedliche Ventilabstände adaptiert werden. On an underside 7 of the aforementioned transverse wall 3, a gas exchange valve contact surface 9 is formed in front of the opposite longitudinal ends 8 (see below). The bridge 1 is guided on the shafts of the gas exchange valves in the shoring via inner sides 14 of the side walls 4. In this context, FIG. 3 shows a variant in which a guide tab 17 is bent off at one or both ends of the bridge 1, via which an additional longitudinal fixation / guidance of the bridge 1 can take place on the gas exchange valves. Here, the bridge 1, with one size, can be adapted to different valve spacings via different cut depths of the guide tabs 17 on the transverse wall 3.
Figur 2 zeigt die Brücke 1 nach einem ergänzenden Ziehschritt, welcher ggf. auch in den vorangehenden, oben beschriebenen Ziehschritt integriert werden kann. Dem- nach hat jedes Plateau 10 der Querwand 3 einen gegenüber den Längsrändern 9a abgesenkten, rechteckkanalähnlichen Mittenabschnitt 12. Die dick in den Figuren 1, 2 gezeichneten Pfeile symbolisieren hierbei die wesentlichen Ziehrichtungen im Ge senk. Wie in Figur 2 zu erkennen, liegen aufgrund des zusätzlichen Ziehschrittes Längswände 13 der abgesenkten Mittenabschnitte 12 abschnittsweise mit ihren Au ßenflächen 14 vor Innenseiten 15 der Querwände 3. Ggf. kann hierzwischen auch ein sichtbar größerer Abstand gewählt werden, um die Biegespannungen im Zaum zu hal ten. Im Querschnitt ergibt sich somit ein M-ähnliches Profil. Die beidendigen Gaswechselventilkontaktflächen 9 verlaufen an Unterflächen 16 der Mittenabschnitte 12. Aufgrund der abgesenkten Mittenabschnitte 12 können über die Brücke 1, bei deren guter Tiefziehfähigkeit, vergleichsweise hohe vertikale Abstände zwischen Nockengegenlauf und Gaswechselventilen „überspannt“ werden. FIG. 2 shows the bridge 1 after a supplementary drawing step which, if necessary, can also be integrated into the preceding drawing step described above. Dem- According to each plateau 10 of the transverse wall 3 has a rectangular channel-like central section 12 that is lowered compared to the longitudinal edges 9a. The arrows drawn in thick in FIGS. 1, 2 symbolize the essential drawing directions in the vertical Longitudinal walls 13 of the lowered middle sections 12 in sections with their outer surfaces 14 in front of inner sides 15 of the transverse walls 3. If necessary, a visibly larger distance can be selected between these in order to keep the bending stresses in check . The two-ended gas exchange valve contact surfaces 9 run on lower surfaces 16 of the middle sections 12. Due to the lowered middle sections 12, comparatively high vertical distances between the counter-cam and the gas exchange valves can be "spanned" via the bridge 1, given its good deep-drawability.
Liste der Bezuqszahlen List of earnings figures
1) Brücke 1) bridge
2) Rand 3) Querwand 2) edge 3) transverse wall
4) Seitenwand 4) side wall
5) Oberseite 5) top
6) Kontaktzone 6) contact zone
7) Unterseite 8) Längsende 7) Bottom 8) Longitudinal end
9) Gaswechselventilkontaktfläche 9a) Längsrand 9) Gas exchange valve contact surface 9a) Longitudinal edge
10)Plateau 10) plateau
11)Dachabschnitt 12)Mittenabschnitt 11) Roof section 12) Central section
13)Längswand 13) longitudinal wall
14)Außenfläche 14) outside surface
15)lnnenseite 15) inside
16)Unterfläche 17)Führungslasche 16) lower surface 17) guide tab

Claims

Patentansprüche Claims
1. Balkenartige Brücke (1 ) für einen Ventiltrieb einer Heavy-Duty- Brennkraftmaschine zur Übertragung eines Nockenhubes auf zwei gleichwir kende Gaswechselventile, welche Brücke (1) ein einteiliger, stanz- biegetechnisch aus Stahlblech hergestellter Hohlkörper mit umgekehrtem U- Profil ist, gebildet durch eine Querwand (3) mit von ihren Längsrändern (9a) abhängenden Seitenwänden (4), welche Querwand (3), ausgehend von Längs enden (8) der Brücke (1), je ein Plateau (10) und bei ihrer Längsmitte eine ab gehobene Kontaktzone (6) für einen zumindest mittelbaren Nockengegenlauf aufweist, welche Plateaus (10) mit der Kontaktzone (6) über je einen Dachab schnitt (11) verbunden sind, wobei an einer Unterseite (7) der Querwand (3), bei den Längsenden (8), je eine Gaswechselventilkontaktfläche (9) liegt, dadurch gekennzeichnet, dass die Plateaus (10) jeweils über einen gegen über den Längsrändern (9a) durch Tiefziehen abgesenkten, rechteckkanalähn lichen Mittenabschnitt (12) verfügen, dessen Längswände (13) mit ihren Au ßenflächen (14) höhenabschnittsweise vor Innenseiten (15) der Querwände (3) stehen, wobei die Gaswechselventilkontaktflächen (9) an Unterflächen (16) der Mittenabschnitte (12) der Plateaus (10) liegen, wobei die Dachabschnitte (11) kugelsegmentartig sind und wobei die Seitenwände (4) an den Längsenden (8) der Brücke (1) unverbundenen-frei auslaufen. 1. Bar-like bridge (1) for a valve train of a heavy-duty internal combustion engine for the transmission of a cam lift to two Gleichwir kende gas exchange valves, which bridge (1) is a one-piece, stamping and bending technology made of sheet steel hollow body with an inverted U-profile, formed by a transverse wall (3) with side walls (4) depending on its longitudinal edges (9a), which transverse wall (3), starting from the longitudinal ends (8) of the bridge (1), each has a plateau (10) and a lifted off at its longitudinal center Contact zone (6) for an at least indirect counter-rotation of the cams, which plateaus (10) are connected to the contact zone (6) via a roof section (11) each, with an underside (7) of the transverse wall (3), the longitudinal ends ( 8), each with a gas exchange valve contact surface (9), characterized in that the plateaus (10) each have a rectangular duct-like center section (12), the length of which is lowered by deep-drawing relative to the longitudinal edges (9a) ngswände (13) with their outer surfaces (14) are vertical sections in front of inner sides (15) of the transverse walls (3), the gas exchange valve contact surfaces (9) on lower surfaces (16) of the middle sections (12) of the plateaus (10), the roof sections (11) are spherical segment-like and wherein the side walls (4) at the longitudinal ends (8) of the bridge (1) terminate unconnected-free.
2. Brücke nach Anspruch 1 , dadurch gekennzeichnet, dass die Brücke (1 ) eine Wandstärke von 2 - 10 mm hat. 2. Bridge according to claim 1, characterized in that the bridge (1) has a wall thickness of 2-10 mm.
3. Brücke nach Anspruch 1 , dadurch gekennzeichnet, dass der abgesenkte Mit tenabschnitt (12) an wenigstens einem der Längsenden (8) mit einer abwärts gebogenen Führungslasche (17) versehen ist. 3. Bridge according to claim 1, characterized in that the lowered Mit tenabschnitt (12) is provided on at least one of the longitudinal ends (8) with a downwardly curved guide tab (17).
4. Brücke nach Anspruch 1 , dadurch gekennzeichnet, dass ein der Querwand (3) abgewandter freier Rand (2) der Seitenwände (4) entweder eine Planfläche oder im Bereich der Längsmitte ausgewölbt ist. 4. Bridge according to claim 1, characterized in that a free edge (2) of the side walls (4) facing away from the transverse wall (3) is either a flat surface or is bulged in the region of the longitudinal center.
PCT/DE2020/100788 2019-10-16 2020-09-10 Beam-like crosshead for a valve train of a heavy duty internal combustion engine WO2021073680A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202080061254.8A CN114364864A (en) 2019-10-16 2020-09-10 Beam bridge for valve train of heavy-duty internal combustion engine
DE112020004993.0T DE112020004993A5 (en) 2019-10-16 2020-09-10 BEAM-LIKE BRIDGE FOR A VALVE TRAIN OF A HEAVY-DUTY ENGINE
EP20775175.1A EP4045774A1 (en) 2019-10-16 2020-09-10 Beam-like crosshead for a valve train of a heavy duty internal combustion engine

Applications Claiming Priority (2)

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DE102019127878 2019-10-16
DE102019127878.3 2019-10-16

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CN (1) CN114364864A (en)
DE (3) DE202020006029U1 (en)
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DE102006002994A1 (en) * 2006-01-21 2007-08-02 Schaeffler Kg Lever-like cam follower
EP2295739A1 (en) * 2009-08-13 2011-03-16 Schaeffler Technologies AG & Co. KG Valve drive for a combustion engine
DE102010011455A1 (en) 2010-03-15 2011-09-15 Schaeffler Technologies Gmbh & Co. Kg Reciprocating internal combustion engine with adjustable inflating element
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DE202020006029U1 (en) 2024-04-23
DE102020117126A1 (en) 2021-04-22
EP4045774A1 (en) 2022-08-24
DE112020004993A5 (en) 2022-11-03
CN114364864A (en) 2022-04-15

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