EP0663522B1 - Crankcase for an internal combustion engine - Google Patents
Crankcase for an internal combustion engine Download PDFInfo
- Publication number
- EP0663522B1 EP0663522B1 EP94118456A EP94118456A EP0663522B1 EP 0663522 B1 EP0663522 B1 EP 0663522B1 EP 94118456 A EP94118456 A EP 94118456A EP 94118456 A EP94118456 A EP 94118456A EP 0663522 B1 EP0663522 B1 EP 0663522B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- crankcase
- reinforcement plate
- flange
- oil pan
- stiffening plate
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/0004—Oilsumps
-
- 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
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0002—Cylinder arrangements
- F02F7/0007—Crankcases of engines with cylinders in line
Definitions
- the invention relates to a crankcase for internal combustion engines, in which a stiffening plate is provided between a crankcase flange and an oil pan flange, sealing means being provided between the crankcase flange and stiffening plate on the one hand and stiffening plate and oil pan flange on the other hand, and having a circumferential edge of the stiffening plate below crankshaft bearings and transverse webs the stiffening plate is connected to the crankcase flange by means of continuous screws.
- a stiffening plate for a crankcase which is arranged between a crankcase flange and an oil pan flange. A circumferential edge of the stiffening plate is connected below the crankshaft bearings by means of crossbars.
- a soft material seal is provided for sealing between the crankcase flange and the stiffening plate on the one hand and between the stiffening plate and oil pan flange on the other hand.
- the stiffening plate is connected to the crankcase flange using continuous screws. Since the known stiffening plate has only a limited thickness for reasons of weight, a soft material seal must be used in order to be able to guarantee oil tightness in the event of bending stress (because of the deformation occurring) of the stiffening plate. Because of the soft material seal, forces from the crankcase can only be transferred to the stiffening plate to a limited extent. The result is that the side walls of the crankcase vibrate, which give rise to sound radiation and thus to loud engine noise.
- the stiffening plate has a shell connecting the longitudinal spars with oil passages.
- the object of the invention is to develop the stiffening plate in such a way that vibrations of the side walls of the crankcase can be largely suppressed and airborne sound radiation can be largely avoided.
- stiffening plate is designed as a casting, with a peripheral edge, the longitudinal spars are connected by transverse webs, which, like the edge, have a large height in comparison to their wall thickness, and that as a sealant between A known liquid seal is provided crankcase flange and stiffening plate.
- the crosspieces between the longitudinal spars of the edge of the stiffening plate preferably have a U-shaped cross section open to the oil pan. This allows a high section modulus to be achieved in the stiffening plate with low weight.
- Oil pans are usually manufactured using the deep-drawing process. Since a specific width-depth ratio cannot be exceeded in the deep-drawing process, an increase in volume of the oil pan at a given depth can only be achieved by widening it, for which purpose the overhanging stiffening plate can form the necessary basis.
- FIG. 1 shows the view of an internal combustion engine in the direction of the longitudinal axis and a cross section through a stiffening plate 1, which is arranged between a crankcase flange 2 and an oil pan flange 3.
- the stiffening plate 1 designed as a cast part is connected to the crankcase flange 2 of a crankcase 5 by means of continuous screws 4.
- a liquid seal known per se and therefore not shown is provided between the stiffening plate 1 and the crankcase flange 2.
- the sealing of the stiffening plate 1 with respect to the oil pan flange 3 of an oil pan 6 can be implemented as a conventional soft material seal.
- a circumferential edge 7 of the stiffening plate 1 is connected by transverse webs 8 which act between its longitudinal spars and act as cross-stiffeners.
- transverse webs 8 act between its longitudinal spars and act as cross-stiffeners.
- the peripheral edge 7 and the transverse webs 8 have a large height in comparison to his / her wall thickness.
- Fig. 2 shows the stiffening plate 1 located between the crankcase flange 2 and the oil pan flange 3 in section II-II
- Fig. 3 shows the latter in plan view.
- the transverse webs 8 preferably have a U-shaped cross section open towards the oil pan 6, but can also be made simpler.
- the crosspieces 8 are each arranged below the crankshaft bearing cover. Due to the U-shaped cross-section, a particularly high bending stiffness is achieved with a low weight.
- a liquid seal known per se can be provided between the crankcase flange 2 and the stiffening plate 1, which allows high support forces in the tensile and compressive direction to be transmitted from the side walls 9 of the crankcase 5 into the stiffening plate 1. By stiffening the side walls 9, vibrations of the same are suppressed and airborne sound radiation is significantly reduced.
- the height of the stiffening plate 1 is about 1/10 - 1/20 in relation to the height of the crankcase 5, but is matched to the respective engine from case to case.
- the relatively large height of the peripheral edge 7 shown in FIGS. 1 and 2 in connection with the U-shaped design of the transverse webs 8 results in a high bending stiffness both in the vertical and in the horizontal direction.
- the stiffening plate 1 is thus stiff in all directions due to the shape according to the invention and will deform only insignificantly under the influence of the forces and moments introduced from the crankcase 5 (FIG. 1, FIG. 2).
Description
Die Erfindung bezieht sich auf ein Kurbelgehäuse für Brennkraftmaschinen, bei dem zwischen einem Kurbelgehäuseflansch und einem Ölwannenflansch eine Versteifungsplatte vorgesehen ist, wobei zwischen Kurbelgehäuseflansch und Versteifungsplatte einerseits und Versteifungsplatte und Ölwannenflansch andrerseits Dichtmittel vorgesehen sind und ein umlaufender Rand der Versteifungsplatte unterhalb von Kurbelwellenlagern Querstege aufweist, sowie die Versteifungsplatte mittels durchgehender Schrauben am Kurbelgehäuseflansch angeschlossen ist.The invention relates to a crankcase for internal combustion engines, in which a stiffening plate is provided between a crankcase flange and an oil pan flange, sealing means being provided between the crankcase flange and stiffening plate on the one hand and stiffening plate and oil pan flange on the other hand, and having a circumferential edge of the stiffening plate below crankshaft bearings and transverse webs the stiffening plate is connected to the crankcase flange by means of continuous screws.
Aus der JP-OS 143 321 ist eine Versteifungsplatte für ein Kurbelgehäuse bekannt, die zwischen einem Kurbelgehäuseflansch und einem Ölwannenflansch angeordnet ist. Ein umlaufender Rand der Versteifungsplatte ist unterhalb von Kurbelwellenlagern mittels Querstegen verbunden. Zur Abdichtung wird zwischen Kurbelgehäuseflansch und der Versteifungsplatte einerseits und zwischen Versteifungsplatte und Ölwannenflansch andrerseits je eine Weichstoffdichtung vorgesehen. Die Versteifungsplatte wird mittels durchgehender Schrauben am Kurbelgehäuseflansch angeschlossen. Da die bekannte Versteifungsplatte aus Gewichtsgründen nur eine begrenzte Dicke aufweist, muß man eine Weichstoffdichtung anwenden, um bei Biegebeanspruchung (wegen der auftretenden Verformung) der Versteifungsplatte Öldichtheit garantieren zu können. Wegen der Weichstoffdichtung können Kräfte aus dem Kurbelgehäuse nur bedingt auf die Versteifungsplatte übertragen werden. Die Folge ist, daß die Seitenwände des Kurbelgehäuses Schwingungen ausführen, die zur Schallabstrahlung und somit zu lautem Motorgeräusch Anlaß geben.From JP-OS 143 321 a stiffening plate for a crankcase is known, which is arranged between a crankcase flange and an oil pan flange. A circumferential edge of the stiffening plate is connected below the crankshaft bearings by means of crossbars. A soft material seal is provided for sealing between the crankcase flange and the stiffening plate on the one hand and between the stiffening plate and oil pan flange on the other hand. The stiffening plate is connected to the crankcase flange using continuous screws. Since the known stiffening plate has only a limited thickness for reasons of weight, a soft material seal must be used in order to be able to guarantee oil tightness in the event of bending stress (because of the deformation occurring) of the stiffening plate. Because of the soft material seal, forces from the crankcase can only be transferred to the stiffening plate to a limited extent. The result is that the side walls of the crankcase vibrate, which give rise to sound radiation and thus to loud engine noise.
Bei der EP-A-187263 weist die Versteifungsplatte eine die Längsholme verbindende Schale mit Öldurchgängen auf.In EP-A-187263, the stiffening plate has a shell connecting the longitudinal spars with oil passages.
Aufgabe der Erfindung ist es, die Versteifungsplatte so weiterzubilden, daß Schwingungen der Seitenwände des Kurbelgehäuses weitgehend unterdrückbar und eine Luftschallabstrahlung derselben weitestgehend vermeidbar sind.The object of the invention is to develop the stiffening plate in such a way that vibrations of the side walls of the crankcase can be largely suppressed and airborne sound radiation can be largely avoided.
Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß die Versteifungsplatte als Gußstück ausgeführt ist, mit einem umlaufenden Rand, dessen Längsholme durch Querstege verbunden sind, die ebenso wie der Rand eine große Höhe im Vergleich zu ihrer/seiner Wandstärke besitzen, und daß als Dichtmittel zwischen Kurbelgehäuseflansch und Versteifungsplatte eine bekannte Flüssigkeitsdichtung vorgesehen ist.This object is achieved in that the stiffening plate is designed as a casting, with a peripheral edge, the longitudinal spars are connected by transverse webs, which, like the edge, have a large height in comparison to their wall thickness, and that as a sealant between A known liquid seal is provided crankcase flange and stiffening plate.
Durch die hohe Biegesteifigkeit der gegossenen Versteifungsplatte bei geringem Eigengewicht werden Verformungen der Platte weitgehend vermieden. Aus diesem Grund kann man auf Weichstoffdichtungen verzichten. Außerdem können Abstützkräfte in Zug- und Druckrichtung weitaus effizienter vom Kurbelgehäuseflansch auf die Versteifungsplatte übertragen werden. Die Folge ist eine Unterdrückung von Schwingungen der Kurbelgehäuseseitenwände und damit eine spürbare Reduktion der Luftschallabstrahlung.Due to the high bending stiffness of the cast stiffening plate with low weight, deformation of the plate is largely avoided. For this reason, there is no need for soft material seals. In addition, support forces in the pulling and pushing directions can be transferred from the crankcase flange to the stiffening plate much more efficiently. The result is a suppression of vibrations in the crankcase side walls and thus a noticeable reduction in airborne noise emissions.
Die Querstege zwischen den Längsholmen des Randes der Versteifungsplatte haben vorzugsweise einen U-förmigen, zur Ölwanne hin offenen Querschnitt. Dadurch läßt sich bei geringem Gewicht ein hohes Widerstandsmoment in der Versteifungsplatte erzielen.The crosspieces between the longitudinal spars of the edge of the stiffening plate preferably have a U-shaped cross section open to the oil pan. This allows a high section modulus to be achieved in the stiffening plate with low weight.
Eine weitere vorteilhafte Ausgestaltung der Erfindung ist darin begründet, daß die Versteifungsplatte den Kurbelgehäuseflansch - in der Draufsicht gesehen - zumindest partiell überragt, soweit, daß
- a) auf deren überkragender Oberseite Maschinenteile und/oder Nebenaggregate und/oder Befestigungsvorrichtungen für diese angebracht werden können,
- b) im überkragenden Bereich Vorkehrungen, z.B. für eine Öleinfüllung, die Aufnahme eines Ölmeßstabes und einen Ölrücklauf von einem Abgasturbolader, angeordnet sein können, und
- c) am Randbereich der überkragenden Unterseite eine entsprechend volumenmäßig vergrößerte, oder in ihrer Bauhöhe reduzierte, volumenmäßig gleichbleibende, ein- oder mehrteilige Ölwanne angebracht werden kann.
- a) machine parts and / or auxiliary units and / or fastening devices for these can be attached to the projecting upper side thereof,
- b) precautions, for example for oil filling, the inclusion of an oil dipstick and an oil return from an exhaust gas turbocharger, can be arranged, and
- c) at the edge area of the cantilevered underside, a correspondingly enlarged or reduced in height, one-piece or multi-piece oil pan that remains the same in volume can be attached.
Ölwannen werden in der Regel im Tiefziehverfahren hergestellt. Da beim Tiefziehverfahren ein bestimmtes Breiten-Tiefen-Verhältnis nicht überschritten werden kann, läßt sich eine Volumenvergrößerung der Ölwanne bei vorgegebener Tiefe nur durch deren Verbreiterung erreichen, wozu die überkragende Versteifungsplatte die notwendige Basis bilden kann.Oil pans are usually manufactured using the deep-drawing process. Since a specific width-depth ratio cannot be exceeded in the deep-drawing process, an increase in volume of the oil pan at a given depth can only be achieved by widening it, for which purpose the overhanging stiffening plate can form the necessary basis.
Ein Ausführungsbeispiel der Erfindung ist nachfolgend anhand der Zeichnung näher erläutert. In der Zeichnung zeigen:
- Fig. 1
- eine Ansicht eines Kurbelgehäuses mit Ölwanne und einen Querschnitt I - I durch die Versteifungsplatte,
- Fig. 2
- eine Seitenansicht einer Brennkraftmaschine mit einer im Schnitt II-II dargestellten Versteifungsplatte, und
- Fig. 3
- eine Draufsicht auf die Versteifungsplatte mit darunter liegender Ölwanne.
- Fig. 1
- a view of a crankcase with an oil pan and a cross section I - I through the stiffening plate,
- Fig. 2
- a side view of an internal combustion engine with a stiffening plate shown in section II-II, and
- Fig. 3
- a plan view of the stiffening plate with the underlying oil pan.
Fig. 1 zeigt die Ansicht einer Brennkraftmaschine in Richtung der Längsachse und einen Querschnitt durch eine Versteifungsplatte 1, welche zwischen einem Kurbelgehäuseflansch 2 und einem Ölwannenflansch 3 angeordnet ist. Die als Gußteil ausgeführte Versteifungsplatte 1 ist mittels durchgehender Schrauben 4 am Kurbelgehäuseflansch 2 eines Kurbelgehäuses 5 angeschlossen. Zwischen Versteifungsplatte 1 und Kurbelgehäuseflansch 2 ist eine an sich bekannte und deshalb nicht näher dargestellte Flüssigkeitsdichtung vorgesehen. Die Abdichtung der Versteifungsplatte 1 gegenüber dem Ölwannenflansch 3 einer Ölwanne 6 kann als übliche Weichstoffdichtung ausgeführt sein.1 shows the view of an internal combustion engine in the direction of the longitudinal axis and a cross section through a
Ein umlaufender Rand 7 der Versteifungsplatte 1 ist durch sich zwischen seinen Längsholmen erstreckende, querversteifend wirkende Querstege 8 verbunden. Zur Erzielung hoher Biegesteifigkeit bei gleichzeitig geringerem Gewicht weisen der umlaufende Rand 7 und die Querstege 8 eine große Höhe im Vergleich zu seiner/ihrer Wandstärke auf.A
Fig. 2 zeigt die zwischen Kurbelgehäuseflansch 2 und Ölwannenflansch 3 befindliche Versteifungsplatte 1 im Schnitt II-II, Fig. 3 zeigt letztere in Draufsicht. Die Querstege 8 weisen vorzugsweise einen U-förmigen, zur Ölwanne 6 hin offenen Querschnitt auf, können aber auch einfacher gestaltet sein.Fig. 2 shows the
Die Querstege 8 sind jeweils unterhalb der Kurbelwellenlagerdeckel angeordnet. Durch den U-förmigen Querschnitt erzielt man eine besonders hohe Biegesteifigkeit bei geringem Eigengewicht.The
Aufgrund der Charakteristik der Versteifungsplatte 1 kann man zwischen Kurbelgehäuseflansch 2 und Versteifungsplatte 1 eine an sich bekannte Flüssigkeitsdichtung vorsehen, welche es gestattet, hohe Abstützkräfte in Zug- und Druckrichtung aus den Seitenwänden 9 des Kurbelgehäuses 5 in die Versteifungsplatte 1 zu übertragen. Durch die Versteifung der Seitenwände 9 werden Schwingungen derselben unterdrückt und eine Luftschallabstrahlung nennenswert reduziert.Due to the characteristics of the
Die Höhe der Versteifungsplatte 1 beträgt in Bezug auf die Höhe des Kurbelgehäuses 5 etwa 1/10 - 1/20, wird aber von Fall zu Fall auf den jeweiligen Motor abgestimmt. Die aus den Fig. 1 und 2 ersichtliche relativ große Höhe des umlaufenden Randes 7 in Verbindung mit der U-förmigen Ausbildung der Querstege 8 ergibt eine hohe Biegesteifigkeit sowohl in vertikaler als auch in horizontaler Richtung.The height of the
Die Versteifungsplatte 1 ist also durch die erfindungsgemäße Formgebung nach allen Richtungen steif und wird sich unter dem Einfluß der aus dem Kurbelgehäuse 5 (Fig. 1, Fig. 2) eingeleiteten Kräfte und Momente nur unwesentlich verformen.The
Diese geringe Verformung wiederum gestattet die Anwendung der Flüssigkeitsdichtung, so daß Kräfte und Momente vom Kurbelgehäuse 5 weitaus besser auf die Versteifungsplatte 1 übertragen werden können, als mit üblichen Weichstoffdichtungen. Zum Vergleich: Nach dem Stand der Technik können wegen der geringen Steifigkeit der Versteifungsplatte nur Weichstoffdichtungen verwendet werden, die es nicht erlauben, größere Kräfte oder Momente vom Kurbelgehäuse auf die Versteifungsplatte zu übertragen.This slight deformation in turn permits the use of the liquid seal, so that forces and moments can be transmitted from the
Claims (3)
- Crankcase for internal-combustion engines, in which crankcase a reinforcement plate (1) is fitted between a crankcase flange (2) and an oil pan flange (3), sealing devices being provided between the crankcase flange (2) and the reinforcement plate (1) on the one hand and the reinforcement plate (1) and the oil pan flange (3) on the other, a circumferential rim (7) located on the reinforcement plate (1) below crankshaft bearings and featuring cross webs (8) and the reinforcement plate (1) being connected to the crankcase flange (2) by means of continuous bolts (4), characterised in that the reinforcement plate (1) is a cast piece with a circumferential rim (7) whose longitudinal spars are interconnected by means of cross webs (8) which like said rim (7) have a large height in comparison with their/its wall thickness and that a wellkown fluid seal is used as sealing device between the crankcase flange and the reinforcement plate (1).
- Crankcase according to Claim 1, characterised in that the cross webs (8) on the reinforcement plate (1) have a U-shaped cross-section which is open towards the oil pan (6).
- Crankcase according to Claim 1, characterised in that when viewed from above the reinforcement plate (1) extends at least partially beyond the crankcase flange (2) so far thata) on its projecting upper side machine parts and/or secondary units and/or mounting devices for these can be attached,b) in the projecting area provision, eg for an oil filler neck, the installation of a dipstick and an oil return line from a turbocharger, can be made, and thatc) an oil pan (6) of enlarged capacity or of reduced constructional height but identical capacity can be fitted to the edge area of the projecting underside.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT5394 | 1994-01-14 | ||
| AT53/94 | 1994-01-14 | ||
| AT5394A AT404165B (en) | 1994-01-14 | 1994-01-14 | CRANKCASE FOR INTERNAL COMBUSTION ENGINES |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0663522A1 EP0663522A1 (en) | 1995-07-19 |
| EP0663522B1 true EP0663522B1 (en) | 1997-10-29 |
| EP0663522B2 EP0663522B2 (en) | 2002-11-06 |
Family
ID=3480287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19940118456 Expired - Lifetime EP0663522B2 (en) | 1994-01-14 | 1994-11-24 | Crankcase for an internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0663522B2 (en) |
| AT (1) | AT404165B (en) |
| DE (1) | DE59404472D1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19754008C2 (en) * | 1997-12-05 | 2003-04-10 | Daimler Chrysler Ag | reciprocating internal combustion engine |
| AT501798B1 (en) * | 2005-04-25 | 2006-11-15 | Man Nutzfahrzeuge Oesterreich | CHARGED INTERNAL COMBUSTION ENGINE |
| DE102006007421A1 (en) * | 2006-02-17 | 2007-08-30 | Deutz Ag | Self-ignited internal combustion engine for e.g. commercial vehicle application, has framework e.g. steel plate, along with oil sump, screwed onto flange surface and extending to gear box-front side through surface |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE8504047L (en) * | 1984-09-11 | 1986-03-12 | Maschf Augsburg Nuernberg Ag | CRANKCASE |
| DE3444838C2 (en) * | 1984-12-08 | 1986-10-30 | Bayerische Motoren Werke AG, 8000 München | Housing for reciprocating internal combustion engine, in particular engine block |
| AT398608B (en) * | 1987-09-22 | 1995-01-25 | Avl Verbrennungskraft Messtech | CRANKCASE |
| JP2559966Y2 (en) * | 1989-01-31 | 1998-01-19 | 三菱自動車工業株式会社 | Lower case structure of cylinder block |
| JP2548173Y2 (en) * | 1989-09-12 | 1997-09-17 | マツダ株式会社 | Engine cylinder block reinforcement structure |
| DE59000360D1 (en) * | 1989-12-22 | 1992-11-19 | Avl Verbrennungskraft Messtech | Internal combustion engine with reciprocating pistons. |
| AT399542B (en) * | 1991-01-30 | 1995-05-26 | Avl Verbrennungskraft Messtech | QUIET INTERNAL COMBUSTION ENGINE |
-
1994
- 1994-01-14 AT AT5394A patent/AT404165B/en not_active IP Right Cessation
- 1994-11-24 EP EP19940118456 patent/EP0663522B2/en not_active Expired - Lifetime
- 1994-11-24 DE DE59404472T patent/DE59404472D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| MTZ Motortechnische Zeitschrift;38(1977) 7/8, Seiten 289-298 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AT404165B (en) | 1998-09-25 |
| DE59404472D1 (en) | 1997-12-04 |
| EP0663522A1 (en) | 1995-07-19 |
| ATA5394A (en) | 1998-01-15 |
| EP0663522B2 (en) | 2002-11-06 |
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