EP1647680A1 - Elément et système raidisseur pour monter un réservoir en matière plastique et pour stabiliser la connection entre bloc moteur et boîte de vitesses - Google Patents

Elément et système raidisseur pour monter un réservoir en matière plastique et pour stabiliser la connection entre bloc moteur et boîte de vitesses Download PDF

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Publication number
EP1647680A1
EP1647680A1 EP04105061A EP04105061A EP1647680A1 EP 1647680 A1 EP1647680 A1 EP 1647680A1 EP 04105061 A EP04105061 A EP 04105061A EP 04105061 A EP04105061 A EP 04105061A EP 1647680 A1 EP1647680 A1 EP 1647680A1
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EP
European Patent Office
Prior art keywords
stiffening element
walls
stiffening
plastic container
attachment points
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04105061A
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German (de)
English (en)
Other versions
EP1647680B1 (fr
Inventor
Bernhard Beer
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.)
ISE Intex GmbH
Original Assignee
ISE Intex 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 ISE Intex GmbH filed Critical ISE Intex GmbH
Priority to DE502004003555T priority Critical patent/DE502004003555D1/de
Priority to AT04105061T priority patent/ATE360135T1/de
Priority to EP04105061A priority patent/EP1647680B1/fr
Publication of EP1647680A1 publication Critical patent/EP1647680A1/fr
Application granted granted Critical
Publication of EP1647680B1 publication Critical patent/EP1647680B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F01M2011/002—Oilsumps with means for improving the stiffness
    • 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
    • F01M2011/0054—Fastening to the cylinder block
    • 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
    • F01M2011/0058—Fastening to the transmission
    • 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
    • F01M2011/0091—Oilsumps characterised by used materials

Definitions

  • the present invention relates to a stiffening element and stiffening system for securing a plastic container and for stabilizing the connection of the engine block and the transmission housing in motor vehicles.
  • containers such as engine oil pans or gear oil pans are liquid-tightly integrated with the engine block as follows: a flange is formed along the edge of the opening of the corresponding container, this flange comprises bores or through holes into which metal bushings are inserted; in turn, screws are screwed for screwing the container to the counterpart. Between the top of the flange and the counterpart a seal is arranged.
  • the plastic material of the container is heavily loaded after application due to the forces acting in the region of the sleeve, so that many screwing points are necessary to achieve the liquid tightness.
  • the rigidity of the construction depends on the modulus of elasticity (modulus of elasticity) of the material used and also to a considerable extent on the operating or service temperature.
  • hydride containers made of plastic with integrated sheet metal carriers have the disadvantage that, due to the different coefficients of thermal expansion of the materials, there can be severe distortion and thus leaks and thus failure of the component. This problem occurs naturally in such devices increasingly, such. As in oil pans, where the temperature can vary greatly.
  • a metal oil pan e.g., die-cast aluminum
  • the disadvantage here is the higher weight of the metal oil pan and, above all, that such a metal oil pan radiates the engine noise much stronger.
  • a stiffening element 1 for fastening a plastic container and stabilizing the connection of the engine block on the one hand and transmission housing on the other hand in motor vehicles, the stiffening element 1 further comprising first vertical walls 2 and mi n least one second vertical wall 4, wherein the second vertical Wall 4, the first vertical walls 2 connects to each other, wherein the first vertical walls 2 and the at least one second vertical wall 4 fastening points 3, 5 and wherein the axes or their parallels of the first attachment points 3 of the first walls 2 substantially perpendicular to the axis or their parallels of the second attachment points 5 of the second wall are 4, wherein at least the first vertical walls 2 and the first attachment points 3 are used for attachment of the plastic container.
  • the upper edge of the first vertical walls 2 of the stiffening element at the lower edge 8 of the flange of the plastic container 6 fits accurately and positively.
  • the attachment points 3 protrude beyond the upper edge of the first vertical walls 2 and are inserted in the mounted state in recesses 9 of the flange 8 of the plastic container 6.
  • the attachment points are preferably sockets.
  • the bushings need not be in a completely regular, cylindrical and closed form, but may also have, for example, a gap, or partially open laterally, which occurs in particular when the stiffening element including the bushes is cut and bent from a piece of sheet metal.
  • a stiffening element comprising first vertical walls 2 with attachment points 3 whose longitudinal axis is parallel to the plane of the vertical first walls.
  • the fastening means which are guided by the attachment points 3, preferably bushings, are fastened to the underside of the engine block.
  • the stiffening element furthermore comprises at least one second vertical wall 4, which connects the first walls 2.
  • two opposing vertical first walls 2 are connected to each other via a second vertical wall 4.
  • the term "connected” is not intended to be understood as meaning that the stiffening element must be assembled from a number of independent parts, because a stiffening element made in one piece (e.g., by die-casting aluminum) is also encompassed by the present invention.
  • the stiffening element is preferably substantially U-shaped. In alternative embodiments, the stiffening element may also be e.g. cover the entire circumference of the oil pan to be fastened.
  • the at least one second wall 4 of the stiffening element has second attachment points 5.
  • the gearbox is to a certain extent lower than the engine block.
  • the fastening means, which are guided by the second attachment points 5, preferably bushings, are fastened to the side of the transmission housing.
  • the axes or their parallels of the first attachment points 3 of the first walls 2 are substantially perpendicular to the axis or their parallels of the second attachment points 5 of the second wall 4, i. the plane in which the former axes extend is substantially perpendicular to the plane in which the latter axes extend.
  • the advantage of the stiffening element according to the invention is that the oil pan is completely decoupled from the force flows. So it is even possible to attach a lighter oil sump made of plastic over the stiffening element.
  • the advantage of this is that a plastic sump transmits much less the noise from the engine and radiates, resulting in a reduction of noise pollution.
  • the plastic container is fastened by the stiffening element.
  • This attachment of the plastic container e.g. an oil pan to the engine block, preferably by screwing, wherein the screws or bolts in the attachment points, preferably bushings, are introduced and screwed in the counterpart.
  • the stiffening element has the advantage here that the forces emanating from the screw connection points (preferably bushings) are distributed uniformly over the entire flange of the plastic container during or after the screwing over the first vertical walls. As a result, individual areas of the plastic part are subjected to less stress and the number of Verschraubungsconce can be reduced without problems with the tightness occur.
  • the present invention enables the separation of the two main functions of the oil sump (i) media guide; ii) stabilization).
  • the oil sump can be optimally designed with regard to its function of the oil guide: Since the sump is completely decoupled from the power flows, the design as a plastic sump is possible, which leads to the reduction of noise.
  • the stabilization can now be achieved by the separate stiffening element, which can be made of a material with a higher rigidity than the oil pan.
  • the stiffening element stabilizes an area at a location where the engine block and the transmission housing meet together.
  • the stiffening element also serves to attach the plastic oil pan.
  • the number of bolting points is reduced without endangering the tightness.
  • the directions of the forces (screwing forces / fastening forces) or their parallels which act on the one hand via the first walls 2 and on the other hand via the at least one second wall 4 are substantially perpendicular to one another.
  • the forces in the attached state on the through the attachment points 3 of the first walls 2 guided fasteners transmitted via the at least one second wall 4 and guided through the attachment points 5 of the second walls 4 fasteners on the parts to be joined, the direction of the power transmission or their parallels of the second wall 4 is substantially perpendicular to Direction of power transmission or their parallels of the first walls 2 is.
  • the axes of the first attachment points 3 are substantially parallel to the plane of the first walls 2.
  • the axes of the second attachment points 5 are substantially perpendicular to the plane of the at least one second wall.
  • the thickness of the first and / or second walls is at least 0.5 mm, preferably in the range of 2 to 5 mm, more preferably in the range of 2 to 4 mm and most preferably in the range of 2.5 to 3 mm.
  • the stiffening element has a modulus of elasticity greater than 10,000, preferably from 10,000 to 250,000, preferably from 10,000 to 80,000, more preferably from 30,000 to 70,000 and particularly preferably from 60,000 to 70,000 N / mm 2 .
  • the stiffening element is made of metal, preferably of steel, or of a cast metal, preferably cast iron, die-cast aluminum or magnesium casting. In an alternative embodiment, the stiffening element is made of sheet metal.
  • This much higher stability is achieved because, for example, a metal sheet has a considerably higher rigidity (modulus of elasticity 210,000 N / mm 2 ) compared to plastic.
  • a glass fiber reinforced PA (polyamide) plastic at 20 ° C has an E-modulus of about 6,000 to 7,000 N / mm 2 , in operation because of the high oil temperatures also below.
  • a higher rigidity over plastic is achieved.
  • the modulus of elasticity of a stiffening element made of die-cast aluminum is, for example, 30,000 to 70,000, preferably 60,000 to 70,000 N / mm 2 .
  • the stiffening element is integrally formed.
  • the attachment points 3, 5 and the walls 2, 4 are joined together by welding. It is preferred that the walls 2, 4 are formed as a metal sheet. In a further embodiment, the walls 2, 4 recesses or holes. This serves to reduce the weight, while maintaining stability. Furthermore, the walls 2, 4 preferably stiffening ribs. It is also preferred that the walls 2, 4 have bends at the edges.
  • the widthwise extension of the walls is substantially parallel to the longitudinal axes of the first attachment points 3.
  • the width extension of the first walls is preferably substantially parallel to the longitudinal axes of the first attachment points (preferably bushings).
  • the first walls 2 are flanged at the edges or have an L-shaped cross-section.
  • the bearing surface of the vertical first walls is increased at the bottom of the flange, resulting in a greater distribution of Anschraub mechanism and Anschraubmomente.
  • the second wall 4 may also have a fold.
  • one or more edges of the first and / or second walls may have a fold.
  • the present invention provides a stiffening element comprising attachment points and disposed on the flange of the opening or the open area of the plastic container such that the attachment points, preferably bushings, of the stiffening element are inserted from below through the recesses or holes of the flange that the vertical first walls of the stiffening element at the bottom of the flange fit accurately and positively.
  • the attachment of the plastic container, such as an oil pan to the engine block is done by screwing, the screws are inserted into the bushes and bolted in the counterpart.
  • the stiffening element has the advantage that the forces emanating from the Verschraubungsticianen be evenly distributed over the entire flange of the plastic container during or after the screwing over the first walls between the bushes. As a result, individual areas of the plastic container are less stressed and the number of Verschraubungshou can be reduced without problems with tightness.
  • the stiffening element according to the invention follows the contour of the opening of the plastic container, the first walls can be angled or bent at individual locations. To increase the component rigidity, beads or bends are preferably arranged at these break points.
  • a stiffening system for fastening a plastic container and for stabilizing the connection of the engine block on the one hand and transmission housing on the other hand in motor vehicles, comprising the above-explained stiffening element and a flange 8 of a plastic container 6, wherein the flange 8 at least along part of the border the opening 7 of the plastic container 6 is formed.
  • the individual essential or preferred features of the above-defined stiffening element also apply to the stiffening system according to the invention.
  • first walls 2 of the stiffening element 1 are connected to a part of the underside of the engine block via the fastening means guided by the fastening points 3, and the at least one second wall 4 is connected to the side surface of a part via the fastening means guided by the fastening points 5 connected to the transmission housing.
  • a Flange 8 is formed, wherein the flange 8 through the thickness of the flange through recesses 9 for receiving the first attachment points 3 of the stiffening element first
  • the plastic container for liquids (6) is an engine oil pan.
  • the rigidity of the stiffening element is at least 10%, preferably at least 50% higher, more preferably at least 10 times higher than the rigidity of the plastic container 6 to be fastened.
  • the stiffening element essentially consists of the same materials as the attachments (engine block and gearbox) manufactured with similar or the same thermal and mechanical properties.
  • the direction of the power transmission from the fastening means guided through the attachment points 3 to the plastic container 6 to be fastened preferably extends in the plane of the first walls 2.
  • the oil pans are no longer made of metal or as a hybrid part, but also that the oil pans due to the use of a smaller number of attachment points, preferably sockets, and a smaller number of fasteners (eg screws, bolts ) become much easier.
  • the smaller number of attachment points is less expensive than the prior art embodiments, wherein a larger number of Verschraubungsyaken must be arranged, and the sockets are at least not connected via additional stiffness elements together.
  • Another advantage results from the possibility to use plastic containers (plastic oil pans) per se, resulting in a reduction of noise pollution. Furthermore, there are advantages from the smaller number the screw points due to the better acoustic decoupling. It is also advantageous that a better acoustic decoupling takes place through the separate flange (second wall 4) for connecting the additional units (gear housing). It also benefits from the fact that with changes in the plastic container for liquids, such as the oil pan, the corresponding flange is independent, ie does not need to be changed. The installation costs are also cheaper because in the fastener according to the invention, the sockets are already integrated and the fastener according to the invention can be mounted in one operation.
  • Figure 1 shows the fastener 1 according to the invention, wherein further elements 4 are arranged for attachment of further components.
  • FIG. 2 shows the fastening element according to the invention from FIG. 4 with plastic container.
  • Figure 1 shows the stiffening element 1 according to the invention comprising vertical walls 2, which are connected to each other via a vertical second wall 4.
  • the first walls 2 have fixed first attachment points (here first sockets 3).
  • the second vertical wall 4 also has second attachment points 5. This allows the transmission housing to connect laterally.
  • the stiffening element essentially follows at least part of the contour of the open area of the plastic oil pan (FIG. 2).
  • the part of the bushes 3, in this embodiment, over the (upper) edge of the first Walls 2 projects is in the holes of the plastic flange 8 of the plastic container 6, as shown in Figure 2, introduced.
  • FIG. 2 shows the stiffening element of Figure 1 according to the invention, which is mounted in a corresponding manner to the plastic container 6.
  • the view shows a plastic container 6 for liquids (here an oil pan for engines), wherein along the border or contour of the opening 7 and the open area of the plastic container or the plastic oil pan, a plastic flange 8 is formed.
  • This plastic flange 8 has holes or through holes 9 into which the first attachment points 3 (sockets) of the stiffening element 1 according to the invention (from FIG. 1) have been introduced.
  • the upper edge of the respective bushes 3, which were introduced into the holes 9 of the plastic flange 8, can be seen in this view.
  • the fastening element furthermore has first vertical walls 2 between these bushes 3 and is arranged with one (namely the upper) edge of the vertical first walls 2 at the lower edge of the plastic flange 8.
  • the (upper) edge of the first walls 2 of the stiffening element 1 is in contact with the lower edge of the plastic flange.
  • the bolting forces and tightening torques that emanate from the bushings are distributed evenly over the plastic flange over the first walls between the bushings.
  • the (upper) edge of the second vertical wall 4 of the stiffening element 1 with the lower edge of the plastic flange in touch.
  • the second vertical wall 4 also has second attachment points 5. About this second wall 4, the transmission housing is connected.
  • the stiffening element according to the invention therefore enables the decoupling of the different functions of the oil pan.
  • the oil sump can now be designed for the media-carrying function without having to consider special stabilization criteria.
  • the stability function is taken over by the stiffening element, which can be optimally designed for this function eg with regard to material and geometry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Plates (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Arrangement Of Transmissions (AREA)
  • General Details Of Gearings (AREA)
EP04105061A 2004-10-14 2004-10-14 Elément et système raidisseur pour monter un réservoir en matière plastique et pour stabiliser la connection entre bloc moteur et boîte de vitesses Expired - Lifetime EP1647680B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE502004003555T DE502004003555D1 (de) 2004-10-14 2004-10-14 Versteifungselement und Versteifungssystem zur Befestigung eines Kunststoffbehälters und zur Stabilisierung der Verbindung von Motorblock und Getriebegehäuse in Kraftfahrzeugen
AT04105061T ATE360135T1 (de) 2004-10-14 2004-10-14 Versteifungselement und versteifungssystem zur befestigung eines kunststoffbehälters und zur stabilisierung der verbindung von motorblock und getriebegehäuse in kraftfahrzeugen
EP04105061A EP1647680B1 (fr) 2004-10-14 2004-10-14 Elément et système raidisseur pour monter un réservoir en matière plastique et pour stabiliser la connection entre bloc moteur et boîte de vitesses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04105061A EP1647680B1 (fr) 2004-10-14 2004-10-14 Elément et système raidisseur pour monter un réservoir en matière plastique et pour stabiliser la connection entre bloc moteur et boîte de vitesses

Publications (2)

Publication Number Publication Date
EP1647680A1 true EP1647680A1 (fr) 2006-04-19
EP1647680B1 EP1647680B1 (fr) 2007-04-18

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EP04105061A Expired - Lifetime EP1647680B1 (fr) 2004-10-14 2004-10-14 Elément et système raidisseur pour monter un réservoir en matière plastique et pour stabiliser la connection entre bloc moteur et boîte de vitesses

Country Status (3)

Country Link
EP (1) EP1647680B1 (fr)
AT (1) ATE360135T1 (fr)
DE (1) DE502004003555D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614868A3 (fr) * 2004-07-07 2007-06-13 Joma-Polytec Kunststofftechnik GmbH Carter d'huile pour une machine en particulier pour un moteur à combustion ou une transmission
DE102006002956A1 (de) * 2006-01-21 2007-07-26 Joma-Polytec Kunststofftechnik Gmbh Ölwanne für eine Brennkraftmaschine
DE202007008481U1 (de) * 2007-06-13 2008-10-23 Mann+Hummel Gmbh Ölwanne für eine Brennkraftmaschine-Getriebe-Einheit
DE102010004493A1 (de) * 2010-01-12 2011-07-21 MANN+HUMMEL GmbH, 71638 Ölwanne für einen Verbrennungsmotor
JP2020056317A (ja) * 2018-09-28 2020-04-09 ダイハツ工業株式会社 内燃機関のオイルパン

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008052259A1 (de) † 2008-10-18 2010-04-22 Mahle International Gmbh Filtereinrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0811761A1 (fr) * 1996-06-07 1997-12-10 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Dispositif d'entraînement pour véhicules
WO2003102387A1 (fr) * 2002-05-29 2003-12-11 Lanxess Corporation Carter d'huile

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0811761A1 (fr) * 1996-06-07 1997-12-10 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Dispositif d'entraînement pour véhicules
WO2003102387A1 (fr) * 2002-05-29 2003-12-11 Lanxess Corporation Carter d'huile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 223 (M - 829) 24 May 1989 (1989-05-24) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614868A3 (fr) * 2004-07-07 2007-06-13 Joma-Polytec Kunststofftechnik GmbH Carter d'huile pour une machine en particulier pour un moteur à combustion ou une transmission
DE102006002956A1 (de) * 2006-01-21 2007-07-26 Joma-Polytec Kunststofftechnik Gmbh Ölwanne für eine Brennkraftmaschine
DE102006002956B4 (de) * 2006-01-21 2017-12-28 Joma-Polytec Gmbh Ölwanne für eine Brennkraftmaschine
DE202007008481U1 (de) * 2007-06-13 2008-10-23 Mann+Hummel Gmbh Ölwanne für eine Brennkraftmaschine-Getriebe-Einheit
WO2008151916A1 (fr) * 2007-06-13 2008-12-18 Mann+Hummel Gmbh Carter d'huile pour une unité moteur à combustion interne- boite de vitesses
US8347844B2 (en) 2007-06-13 2013-01-08 Mann + Hummel Gmbh Oil pan for internal combustion engine transmission unit
DE102010004493A1 (de) * 2010-01-12 2011-07-21 MANN+HUMMEL GmbH, 71638 Ölwanne für einen Verbrennungsmotor
CN102146821A (zh) * 2010-01-12 2011-08-10 曼·胡默尔有限公司 用于内燃发动机的油底壳
CN102146821B (zh) * 2010-01-12 2015-11-18 曼·胡默尔有限公司 用于内燃发动机的油底壳
DE102010004493B4 (de) * 2010-01-12 2015-12-03 Mann + Hummel Gmbh Ölwanne für einen Verbrennungsmotor
JP2020056317A (ja) * 2018-09-28 2020-04-09 ダイハツ工業株式会社 内燃機関のオイルパン

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Publication number Publication date
DE502004003555D1 (de) 2007-05-31
ATE360135T1 (de) 2007-05-15
EP1647680B1 (fr) 2007-04-18

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