DE102009055138B4 - Oil pan with a bottom section offset upwards - Google Patents

Abstract

An oil pan comprising a deep region (104) and a flat region (106) extending in a longitudinal direction (108) of the oil pan (100) away from the deep region (104), the flat region (106) facing side walls (110) and a floor (114) connecting the side walls (110) to one another, the floor (114) of the flat region (106) having two side floor sections (116) adjacent to the side walls (110) and one between the side floor sections (116 ) arranged offset bottom section (118), the offset bottom section (118) being arranged substantially centrally on the bottom (114) of the flat region (106) of the oil pan (100), the offset bottom section (118) being substantially mirror-symmetrical a longitudinal center plane (138) of the oil pan (100) running vertically and along the longitudinal direction (108) of the oil pan (100) is formed in the installed state of the oil pan (100) and the offset bottom a Section (118) in the installed state of the oil pan (100) is displaced upwards in the vertical direction (120) with respect to the lateral base sections (116), the offset floor section (118) via a connecting section inclined to the horizontal in the installed state of the oil pan (100) (122) is connected to each of the side bottom sections (116), each connecting section (122) by more than two coupling elements (126), which are spaced apart in the longitudinal direction (108) of the oil pan (100), to the respective other connecting section ( 122) is coupled and at least one coupling element (126) does not extend into the interior of the oil pan (100), the oil pan (100) being an integral base body (102) which covers the entire flat area (106) of the oil pan (100), comprises the deep region (104) of the oil pan (100) and the coupling elements (126), the base body (102) of the oil pan (100) being made of a thermoplastic material is formed aterially, the offset bottom section (118) together with the two adjacent connecting sections (122) forming a bead (124) formed in the bottom (114) of the flat area (106) of the base body (102), which is spaced from a rear wall (112) of the flat area (106) of the base body (102) ends, and wherein the coupling elements (126) are designed as transverse ribs (128) extending transversely to the longitudinal direction (108) of the oil pan (100), which together form a transverse belt (130) form, which extends over the entire width of the bottom (114) of the flat region (106) and thus couples the two side walls (110) to one another and to the connecting sections (122).

Description

The present invention relates to an oil pan that includes a deep region and a flat region that extends in a longitudinal direction of the oil pan from the deep region, the flat region having opposite side walls and a bottom connecting the side walls.

Such oil pans are known from the prior art, serve to hold a reservoir of an engine oil for an internal combustion engine and are attached to an engine block of the internal combustion engine.

The DE 10 2008 044 194 A1 discloses an oil pan having a first region and a second region separated by a partition, the bottom wall of the first region being provided with a plurality of groove-shaped oil cooling sections on its top.

The DE 30 24 630 A1 discloses an oil pan having a deep region and a flat region extending in a longitudinal direction of the oil pan from the deep region, with ridges on the outside of the oil pan at the upper edge of the side walls of the oil pan and in a lower region of the side walls and at the bottom the flat area of the oil pan webs are provided on the inside of the oil pan.

The EP 1 482 135 A2 discloses an oil pan with a bottom that is substantially formed as a portion of a spherical surface with a center located above the oil pan.

The DE 83 23 945 U1 discloses an oil pan comprising a deep region and a flat region extending in a longitudinal direction of the oil pan from the deep region, the flat region having opposite side walls and a bottom connecting the side walls.

The JP 2006-274813 A discloses an oil pan comprising a deep region and a flat region extending in a longitudinal direction of the oil pan from the deep region, the flat region having opposing side walls and a bottom connecting the side walls, the bottom of the flat region being two lateral side portions adjacent to the side walls and a staggered bottom portion disposed between the side bottom portions, the staggered bottom portion being substantially centered on the bottom of the flat portion of the oil pan, the staggered bottom portion extending in the longitudinal direction of the oil pan over at least half the length the flat area of the oil pan, the offset bottom section being substantially mirror-symmetrical to a longitudinal center plane of the oil pan running vertically and along the longitudinal direction of the oil pan when the oil pan is installed, wherein the staggered bottom section in the installed state of the oil pan is offset vertically from the side bottom sections and wherein the staggered bottom section is connected to each of the side bottom sections via a connecting section inclined to the horizontal when the oil pan is installed.

The EP 2 014 882 A2 discloses an oil pan comprising a deep region and a flat region extending in a longitudinal direction of the oil pan from the deep region, the flat region having opposite side walls and a bottom connecting the side walls.

The EP 2 093 395 A1 discloses an oil pan comprising a deep region and a flat region extending in a longitudinal direction of the oil pan from the deep region, the flat region having opposing side walls and a bottom connecting the side walls, the bottom of the flat region being two lateral side portions adjacent to the side walls and a staggered bottom portion disposed between the side bottom portions, the staggered bottom portion extending in the longitudinal direction of the oil pan over at least half the length of the flat region of the oil pan, the staggered bottom section in the vertical direction when the oil pan is installed is offset upwards with respect to the lateral base sections and the offset base section is connected to each of the lateral base sections via a connecting section which is inclined towards the horizontal when the oil pan is installed is.

The present invention has for its object to provide such an oil pan, which has improved acoustic properties and is less excited to vibrate in the operating state of the internal combustion engine.

This object is achieved by an oil pan according to claim 1.

The mechanical coupling of the connecting section to another, opposite connecting section and / or to one of the side walls of the flat area of the oil pan means that the flat area is cross-braced achieved, whereby its natural frequencies are shifted to higher frequencies.

Furthermore, the offset bottom section and the connecting sections adjoining the same form a bead in the otherwise preferably flat bottom of the flat region of the oil pan.

The natural vibration of this region of the oil pan, which has the lowest frequency, has a direction of vibration oriented substantially perpendicular to the longitudinal direction of the oil pan and perpendicular to the vertical.

These measures ensure that the oil pan during operation of the engine on which the oil pan is mounted is only slightly excited to vibrate by natural vibrations of the engine, so that the noise development is minimized through acoustic optimization and also the mechanical stability of the oil pan is not affected by vibrations.

The coupling elements are designed as transverse ribs extending transversely to the longitudinal direction of the oil pan.

It is particularly expedient if at least one coupling element is designed as a transverse rib extending essentially perpendicular to the longitudinal direction of the oil pan. Preferably, two or more coupling elements, in particular all coupling elements, are designed as transverse ribs which extend essentially perpendicular to the longitudinal direction of the oil pan.

In the oil pan according to the invention, more than two coupling elements are provided which are spaced apart from one another in the longitudinal direction of the oil pan.

It is advantageous if the distance between the coupling elements in the longitudinal direction of the oil pan is greater than the extent of a coupling element in the longitudinal direction of the oil pan.

In a preferred embodiment of the invention, two or more coupling elements are provided, which are aligned essentially parallel to one another. It is particularly favorable if all coupling elements are aligned essentially parallel to one another.

In a preferred embodiment of the invention, at least one coupling element on the outside of the oil pan projects beyond the bottom of the flat region of the oil pan. Preferably two or more coupling elements, preferably all coupling elements, protrude on the outside of the oil pan above the bottom of the flat area of the oil pan.

In order not to hinder the oil flow in the interior of the flat area of the oil pan, it is favorable that at least one coupling element does not extend into the interior of the oil pan. Preferably, two or more coupling elements, in particular all coupling elements, do not extend into the interior of the oil pan.

The invention provides that there is a staggered bottom section which is arranged substantially centrally on the bottom of the flat region of the oil pan and is essentially mirror-symmetrical to a longitudinal center plane of the oil pan running vertically and along the longitudinal direction of the oil pan when the oil pan is installed.

When the oil pan is installed, the offset bottom section is offset upwards from the side bottom sections. As a result, the offset floor section projects into the interior of the flat area of the oil pan.

The offset bottom section extends in the longitudinal direction of the oil pan preferably over at least half, in particular over at least two thirds, the length of the flat region of the oil pan, the length of the flat region being understood to mean its extension in the longitudinal direction of the oil pan.

Furthermore, it is preferably provided that the offset bottom section extends in a transverse direction of the oil pan, which runs horizontally perpendicular to the longitudinal direction of the oil pan and in the installed state of the oil pan, over at least one sixth of the distance between the side walls of the flat region of the oil pan.

The at least one coupling element, by means of which at least one connecting section is coupled to another connecting section and / or to one of the side walls of the flat area, is in one piece with the offset bottom section of the flat area, in particular also in one piece with at least one connecting section and / or with one of the Sidewalls of the flat area of the oil pan.

The oil pan comprises a one-piece base body, which comprises at least the bottom and the side walls of the flat region of the oil pan.

At least one coupling element is formed in one piece with this base body. Especially It is expedient if two or more coupling elements, in particular all coupling elements, are formed in one piece with the base body.

The one-piece base body can encompass the entire flat area of the oil pan and in particular also the deep area of the oil pan.

The base body of the oil pan is preferably made of a thermoplastic material, for example of a polyamide, in particular of the polyamide 6.6 , educated.

The material of the base body can be reinforced by fibers, in particular glass fibers.

The base body can in particular be produced in an injection molding process, preferably in a cascade injection molding process.

Further features and advantages of the invention are the subject of the following description and the drawing of exemplary embodiments.

• 1 eine perspektivische Darstellung eines Grundkörpers einer Ölwanne, der einen vorderen tiefen Bereich und einen hinteren flachen Bereich umfasst, wobei sich der flache Bereich in einer Längsrichtung des Grundkörpers der Ölwanne von dem tiefen Bereich weg erstreckt, mit Blick auf eine im montierten Zustand dem Motorblock zugewandten Oberseite der Ölwanne;
• 2 eine weitere perspektivische Darstellung des Grundkörpers der Ölwanne aus 2, mit Blick auf eine im montierten Zustand der Ölwanne dem Motorblock abgewandten Unterseite der Ölwanne;
• 3 eine Seitenansicht des Grundkörpers der Ölwanne aus den 1 und 2, von links gesehen;
• 4 eine Draufsicht von oben auf den Grundkörper der Ölwanne aus den 1 bis 3, mit der Blickrichtung in Richtung des Pfeiles 4 in 3;
• 5 eine Draufsicht von unten auf den Grundkörper der Ölwanne aus den 1 bis 4, mit der Blickrichtung in Richtung des Pfeiles 5 in 3;
• 6 eine Vorderansicht des Grundkörpers der Ölwanne aus den 1 bis 5, mit der Blickrichtung in Richtung des Pfeiles 6 in 3;
• 7 eine perspektivische, teilweise geschnittene Darstellung des flachen Bereichs des Grundkörpers der Ölwanne aus den 1 bis 6, mit Blick auf die Unterseite der Ölwanne;
• 8 eine perspektivische, teilweise geschnittene Darstellung des flachen Bereichs des Grundkörpers der Ölwanne aus 7, mit Blick auf die Oberseite der Ölwanne;
• 9 einen vertikalen Schnitt durch den flachen Bereich des Grundkörpers der Ölwanne aus den 1 bis 9, längs der Linie 9-9 in 4;
• 10 einen vertikalen Schnitt durch den tiefen Bereich des Grundkörpers der Ölwanne aus den 1 bis 9, längs der Linie 10-10 in 4;
• 11 eine perspektivische, teilweise geschnittene Ansicht des tiefen Bereichs des Grundkörpers der Ölwanne aus den 1 bis 10, mit Blick auf die Oberseite der Ölwanne;
• 12 eine perspektivische, teilweise geschnittene Ansicht des tiefen Bereichs des Grundkörpers der Ölwanne aus den 1 bis 11, mit Blick auf die Unterseite der Ölwanne;
• 13 eine perspektivische, teilweise geschnittene Ansicht des tiefen Bereichs des Grundkörpers der Ölwanne aus den 1 bis 12, mit Blick auf die Oberseite der Ölwanne, wobei die Schnittebene durch den tiefen Bereich des Grundkörpers parallel zu der Schnittebene der 11 verläuft und näher an einem vorderen Ende des Grundkörpers liegt;
• 14 eine perspektivische Darstellung der rechten Hälfte des Grundkörpers der Ölwanne aus den 1 bis 13, mit Blick auf die Unterseite der Ölwanne;
• 15 eine vergrößerte Darstellung des tiefen Bereichs des Grundkörpers der Ölwanne aus 14;
• 16 eine perspektivische Draufsicht auf eine Ölablassöffnung der Ölwanne, mit Blick auf die Unterseite der Ölwanne;
• 17 eine Draufsicht von unten auf die Ölablassöffnung der Ölwanne aus 16;
• 18 eine perspektivische Darstellung einer Aufnahme für ein Verschlusselement zum Verschließen der Ölablassöffnung der Ölwanne, mit Blick auf die Oberseite der Ölwanne;
• 19 eine Draufsicht von oben auf die Aufnahme für das Verschlusselement der Ölablassöffnung aus 18;
• 20 eine perspektivische Darstellung eines Verschlusselements zum Verschließen der Ölablassöffnung der Ölwanne, mit Blick auf einen unteren Kopfteil des Verschlusselements;
• 21 eine Seitenansicht des Verschlusselements aus 20;
• 22 eine mit beispielhaften Bemaßungen versehene Abwicklung einer oberen Führungskontur eines Führungskanals des Verschlusselements aus den 20 und 21;
• 23 eine der 18 entsprechende perspektivische Darstellung der Aufnahme für das Verschlusselement, wobei das Verschlusselement in einer Schließstellung an der Aufnahme aufgenommen ist;
• 24 eine der 17 entsprechende Draufsicht von unten auf die Ölablassöffnung der Ölwanne, wobei die Ölablassöffnung durch das sich in der Schließstellung befindliche Verschlusselement verschlossen ist;
• 25 einen vertikalen Schnitt durch die Ölablassöffnung der Ölwanne, die Aufnahme für das Verschlusselement und das in der Schließstellung an der Aufnahme aufgenommene und die Ölablassöffnung verschließende Verschlusselement;
• 26 einen vertikalen Schnitt durch den tiefen Bereich des Grundkörpers der Ölwanne und ein mit dem Grundkörper der Ölwanne verrastetes Ölabsaugrohr;
• 27 eine vergrößerte Darstellung des Bereichs I aus 26;
• 28 eine perspektivische Darstellung einer einstückig mit dem Grundkörper der Ölwanne ausgebildeten Aufnahme für das Ölabsaugrohr und eines im montierten Zustand außerhalb des Grundkörpers der Ölwanne angeordneten Abschnittes des Ölabsaugrohrs;
• 29 eine schematische perspektivische Darstellung des Grundkörpers der Ölwanne und mehrerer nacheinander geöffneter Düsen zum Einbringen von Ausgangsmaterial zum Herstellen des Grundkörpers in einem Kaskaden-Spritzgießverfahren; und
• 30 einen schematischen vertikalen Schnitt durch den flachen Bereich einer alternativen Ausführungsform eines Grundkörpers der Ölwanne, längs der Linie 9-9 in 4, wobei ein versetzter Bodenabschnitt des flachen Bereichs des Grundkörpers nicht nach oben, sondern nach unten hin versetzt ist.

The drawings show:

• 1 a perspective view of a base body of an oil pan, which comprises a front deep area and a rear flat area, the flat area extending in a longitudinal direction of the base body of the oil pan away from the deep area, with a view of an upper side facing the engine block in the assembled state the oil pan;
• 2 a further perspective view of the base body of the oil pan 2 , with a view of an underside of the oil pan facing away from the engine block when the oil pan is installed;
• 3 a side view of the base body of the oil pan from the 1 and 2 , seen from the left;
• 4 a top view of the base of the oil pan from the 1 to 3 , looking in the direction of the arrow 4 in 3 ;
• 5 a bottom view of the base of the oil pan from the 1 to 4 , looking in the direction of the arrow 5 in 3 ;
• 6 a front view of the body of the oil pan from the 1 to 5 , looking in the direction of the arrow 6 in 3 ;
• 7 a perspective, partially sectioned representation of the flat region of the base body of the oil pan from the 1 to 6 , facing the bottom of the oil pan;
• 8th a perspective, partially sectioned representation of the flat region of the base body of the oil pan 7 , facing the top of the oil pan;
• 9 a vertical section through the flat area of the base of the oil pan from the 1 to 9 along the line 9-9 in 4 ;
• 10 a vertical section through the deep area of the base of the oil pan from the 1 to 9 along the line 10-10 in 4 ;
• 11 a perspective, partially sectioned view of the deep region of the base body of the oil pan from the 1 to 10 , facing the top of the oil pan;
• 12 a perspective, partially sectioned view of the deep region of the base body of the oil pan from the 1 to 11 , facing the bottom of the oil pan;
• 13 a perspective, partially sectioned view of the deep region of the base body of the oil pan from the 1 to 12 , with a view of the top of the oil pan, the cutting plane through the deep area of the body parallel to the cutting plane of the 11 runs and is closer to a front end of the base body;
• 14 a perspective view of the right half of the body of the oil pan from the 1 to 13 , facing the bottom of the oil pan;
• 15 an enlarged view of the deep area of the body of the oil pan 14 ;
• 16 a top perspective view of an oil drain opening of the oil pan, with a view of the underside of the oil pan;
• 17 a plan view from below of the oil drain opening of the oil pan 16 ;
• 18th a perspective view of a receptacle for a closure element for closing the oil drain opening of the oil pan, with a view of the top of the oil pan;
• 19 a plan view from above of the receptacle for the closure element of the oil drain opening 18th ;
• 20th a perspective view of a closure element for closing the oil drain opening of the oil pan, with a view of a lower head part of the closure element;
• 21 a side view of the closure element 20th ;
• 22 a provided with exemplary dimensions of an upper guide contour of a guide channel of the closure element from the 20th and 21 ;
• 23 one of the 18th corresponding perspective view of the receptacle for the closure element, the closure element being accommodated on the receptacle in a closed position;
• 24 one of the 17 corresponding top view from below of the oil drain opening of the oil pan, the oil drain opening being closed by the closure element located in the closed position;
• 25th a vertical section through the oil drain opening of the oil pan, the receptacle for the closure element and the closure element received in the closed position on the receptacle and closing the oil drain opening;
• 26 a vertical section through the deep area of the base body of the oil pan and an oil suction pipe locked to the base body of the oil pan;
• 27 an enlarged view of area I. 26 ;
• 28 a perspective view of an integrally formed with the base body of the oil pan receptacle for the oil suction pipe and a section of the oil suction pipe arranged outside the base body of the oil pan in the assembled state;
• 29 is a schematic perspective view of the base body of the oil pan and several nozzles opened one after the other for introducing starting material for producing the base body in a cascade injection molding process; and
• 30th a schematic vertical section through the flat area of an alternative embodiment of a base body of the oil pan, along the line 9-9 in 4 , wherein an offset bottom portion of the flat region of the base body is not offset upwards but downwards.

Identical or functionally equivalent elements are designated with the same reference symbols in all figures.

One in the 1 to 6 Oil pan shown as a whole and designated 100 comprises a pan-shaped base body 102 which has a front, deep area 104 and a rear flat area 106 includes, the flat area 106 itself in a longitudinal direction 108 the oil pan 100 and the body 102 from the deep area 104 extends away.

The flat area 106 of the basic body 102 facing each other, facing each other in the longitudinal direction 108 extending sidewalls 110 on that at a the deep area 104 opposite rear end of the base body 102 through a back wall 112 are interconnected, as well as a floor 114 which is the two side walls 110 connects with each other.

How best from the 2 and 7 to 9 you can see the floor 114 of the flat area 106 two each one side wall 110 adjacent side floor sections 116 that in the assembled state of the oil pan 100 almost horizontal, with a slight inclination to the deep area 104 of the basic body 102 are aligned, and one between the side bottom portions 116 arranged offset bottom section 118 which in the installed state of the oil pan 100 towards the vertical 120 opposite the side floor sections 116 upwards, into the interior of the flat area 106 of the basic body 102 is offset.

Even the offset section of the floor 118 is in the installed state of the oil pan 100 almost horizontal, with a slight inclination to the deep area 104 of the basic body 102 the oil pan 100 towards, aligned.

The offset floor section 118 is in the installed state of the oil pan 100 connecting section inclined to the horizontal 122 of the floor 114 with each of the side floor sections 116 connected.

The offset floor section 118 forms together with the two adjacent connecting sections 122 one in the ground 114 of the flat area 106 of the basic body 102 trained bead 124 ,

To stiffen the bead 124 and therefore the soil 114 is a plurality of coupling elements 126 provided which is the shape of transverse ribs 128 have and transversely, preferably substantially perpendicular to the longitudinal direction 108 of the basic body 102 and the bead 124 from the left connection section 122a over the offset floor section 118 away to the right connection section 122b and preferably in addition, over the respective lateral bottom section 116 away, at least almost to the respective side wall 110 , preferably up to the respective side wall 110 , extend.

These cross ribs 128 together form a cross belt 130 , which extends over at least almost the entire width or preferably over the entire width of the floor 114 of the flat area 106 extends and so the two side walls 110 with each other and with the side walls of the bead 124 forming connecting sections 122 couples.

The coupling elements 126 are preferably in one piece with the floor 114 and the side walls 110 of the basic body 102 the oil pan 100 educated.

Through the mechanical coupling of the side walls 110 and the connecting sections 122 becomes a cross brace of the flat area 106 of the basic body 102 the oil pan 100 achieved, creating the natural frequencies of the flat area 106 of the basic body 102 be shifted to higher frequencies.

Furthermore, due to the presence of the bead 124 in the otherwise essentially flat bottom 114 of the flat area 106 achieved the lowest natural vibration of this area of the body 102 has an amplitude which is substantially perpendicular to the longitudinal direction 108 and perpendicular to the vertical 120 aligned cross direction 132 of the basic body 102 the oil pan 100 points.

These measures ensure that the oil pan 100 in the operation of the engine on which the oil pan 100 is mounted, is only excited to a small extent by vibrations of the engine to natural vibrations, so that the noise is minimized by acoustic optimization and the mechanical stability of the oil pan not by vibrations of the body 102 is affected.

How best to look 2 you can see, the bead extends 124 with the offset bottom section 118 in the longitudinal direction 108 more than half, preferably at least two thirds, of the length of the flat area 106 of the basic body 102 , ie its expansion in the longitudinal direction 108 ,

The bead extends to the front 124 to almost the deep area 104 of the basic body 102 approach.

The bead ends at the back 124 at a distance from the back wall 112 ,

The through the coupling elements 126 formed cross belt 130 extends over more than half, preferably more than two thirds, of the length of the bead 124 in the longitudinal direction 108 away.

It can also be provided that the cross belt 130 additional cross ribs 134 includes which between the rear end of the bead 124 and the back wall 112 are arranged.

All coupling elements 126 and the additional cross ribs 134 are in the longitudinal direction 108 narrow and have a thickness in this direction, which is significantly smaller than the distance d from in the longitudinal direction 108 successive coupling elements 126 ,

The distance d is preferably less than half, in particular less than a quarter, of the distance d in the longitudinal direction 108 ,

All coupling elements 126 are essentially parallel to one another and to the transverse direction 132 aligned and follow along the longitudinal direction 108 essentially equidistant from each other.

The coupling elements 126 and the additional cross ribs 134 are preferably only on the outside of the base body 102 provided and stand from the outside of the floor 114 out down in front.

Inside the flat area 106 of the basic body 102 are preferably not coupling elements 126 provided the oil return from the flat area 106 in the deep range 104 of the basic body 102 not to hinder.

How best from the 4 and 8th the flat area shows 106 of the basic body 102 inner ribs for further stiffening 136 which are essentially triangular in the side view and each have a side wall 110 with the adjacent side floor section 116 connect.

To drain the oil from the gaps between the inner fins 136 the inner ribs are to facilitate 136 obliquely to the longitudinal direction 108 of the basic body 102 aligned, in such a way that you the respective side wall 110 opposite end closer to the deep area 104 of the basic body 102 lies as that of the respective side wall 110 facing end.

Furthermore, the inner ribs 136 preferably curved, namely - from the deep area 104 of the basic body 102 seen from - concave curved.

This concave curvature prevents the oil from draining from the flat Area 106 of the basic body 102 Oil residue behind the inner ribs 136 stay behind.

The number of inner ribs 136 is preferably about twice the number of transverse ribs 128 and 134 on the outside of the flat area 106 ,

The coupling point of every second inner rib lies here 136 to the assigned side wall 110 preferably at approximately the same axial position (along the longitudinal direction 108 ) as the coupling point of one of the transverse ribs 128 or 134 on the same side wall 110 , whereby the coupling of the relevant cross rib 128 respectively. 134 on the respective side wall 110 is reinforced.

The offset floor section 118 and preferably the entire bead 124 are essentially mirror-symmetrical to one in the installed state of the oil pan 100 vertical, lengthways 108 of the basic body 102 longitudinal median plane 138 of the basic body 102 educated.

The front deep area 104 of the basic body 102 includes a floor 140 , one of the flat area 106 the oil pan 100 facing front wall 142 , one the floor 140 of the deep area 104 with the floor 114 of the flat area 106 connecting rear wall 144 and two the front wall 142 with the back wall 144 connecting side walls 145 , which are essentially parallel to the longitudinal direction 108 extend (see in particular the 1 to 6 ).

To stiffen the deep area 104 is the same on the outside with a central longitudinal belt 146 provided which has a plurality of parallel longitudinal ribs 148 includes that in the transverse direction 132 of the basic body 102 are spaced from each other and from a mounting flange 150 at the top of the front wall 142 over the front wall 142 essentially vertically down and over the floor 140 of the deep area 104 to the back wall 144 of the deep area 104 extend.

In the area of the floor 140 run the longitudinal ribs 148 essentially parallel to the longitudinal direction 108 of the basic body 102 ,

The mounting flange 150 serves to assemble the base body 102 the oil pan 100 (via a seal, not shown) on the engine block of an internal combustion engine (not shown) and runs, closed in a ring, around the upper edge of the deep region 104 and the flat area 106 of the basic body 102 ,

The mounting flange 150 has a plurality of in the circumferential direction of the mounting flange 150 spaced-apart recordings 152 for fastening screws 154 with which the oil pan 100 can be fixed to the engine block.

For stiffening the mounting flange 150 this is with all-round box ribbing 155 Mistake.

The deep area 104 of the basic body 102 points from the side walls 145 out in the transverse direction 132 protruding additional pockets 156 on whose interiors match the interior of the deep area 104 communicate and increase its oil absorption capacity.

In particular, are on each side wall 145 a smaller additional front pocket 156a and a larger back pocket 156b provided by a space 158 are separated from each other, which is used to hold the engine support during assembly of the oil pan 100 serves on the engine.

In addition to the central longitudinal belt 146 are longitudinal side straps 160 provided which each have several longitudinal ribs 148 include, extending from the mounting flange 150 over the front wall 142 and the floor 140 of the deep area 104 to the back wall 144 extend.

Additional side longitudinal ribs 162 can be found on the front of the additional front pockets 156a and the undersides of the additional front pockets 156a and the additional rear pockets 156b extend and through each of the spaces 158 be interrupted.

The longitudinal ribs 148 of the central longitudinal belt 146 and the side longitudinal straps 160 preferably extend over the entire rear wall 144 of the deep area 104 until the beginning of the floor 114 of the flat area 106 ,

The floor can 114 of the flat area 106 at its the deep area 104 end facing the horizontal by a relatively large angle of, for example, approximately 30 °, to the outflow of oil from the flat area 106 in the deep range 104 to favor.

How best from the 2 and 5 you can see the floor 140 of the deep area 104 in addition to the longitudinal ribs 148 and 162 with a central cross belt 164 , a rear cross belt 166 and a front cross belt 168 provided, each consisting of several in the transverse direction 132 extending and in the longitudinal direction 108 spaced apart transverse ribs 170 are formed.

The cross ribs 170 of the central cross belt 164 cross the longitudinal ribs 148 of the central longitudinal belt 146 in an approximately square central section 172 of the floor 140 and form a cross ribbing there.

The cross ribs 170 of the central cross belt 166 each extend across the entire width of the floor 140 (including the underside of the additional pockets 156 ), ie over its entire extent in the transverse direction 132 so the side walls 110 of the deep area 104 of the basic body 102 through the central cross belt 164 are coupled together.

Through the mechanical coupling of the rear wall 144 of the deep area 104 by means of the central longitudinal belt 146 with the front wall 142 and the mounting flange 150 on the one hand and the mechanical coupling of the two side walls 145 of the deep area 104 by means of the central cross belt 164 becomes the deep area 104 stiffened so that its natural frequencies are shifted towards higher frequencies.

As a result, the oil pan has fewer natural vibrations when the internal combustion engine is operating 100 are excited by vibrations of the engine, which results in less noise due to acoustic optimization and a higher mechanical stability of the oil pan 100 has the consequence.

Cross ribs 170 of the rear cross belt 166 are in their central area between the side walls 145 curved and enclose one in the ground 140 of the deep area 104 provided oil drain opening 174 of the basic body 102 ,

Left and right of the oil drain hole 174 the cross ribs cross 170 of the rear cross belt 166 with longitudinal ribs 148 of the central longitudinal belt 146 and one side longitudinal belt each 160 as well as with the additional lateral longitudinal ribs 162 on the additional pockets 156 left and right of the oil drain hole 174 one rear parking area each 176 is formed with cross ribbing on which the unit consisting of the engine block and the oil pan mounted thereon 100 can be turned off.

The cross ribs also cross 170 of the front cross belt 168 which in the area of the central longitudinal belt 146 the longitudinal ribs are interrupted 148 the side longitudinal straps 160 and thus form additional front storage areas 178 on both sides of the central longitudinal belt 146 , which each have cross ribbing and also for parking the unit consisting of the engine block and the oil pan attached to it 100 can serve.

How best from the 11 to 13 you can see the additional pockets 156 of the deep area 104 of the basic body 102 with a cross ribbing on the inside 180 from inner vertical ribs running in a substantially vertical direction 182 and crossing them when the oil pan is installed 100 essentially horizontal horizontal ribs 184 provided, creating the deep area 104 of the basic body 102 is further stiffened.

The vertical ribs are there 182 preferably further into the interior of the deep area 104 in front than the horizontal ribs 184 ,

On the outside of the deep area 104 are preferably the longitudinal ribs 148 and 162 further over the outside of the base body 102 before than the cross ribs 170 , because after installing the oil pan 100 stones thrown from the street with the engine block into a motor vehicle more often in the longitudinal direction 108 than move across to it.

The longitudinal ribs 148 and 162 on the front wall 142 of the basic body 102 serve, in addition to achieve a mechanical coupling to the mounting flange 150 , as stone chip protection.

The floor 140 of the deep area 104 of the basic body 102 preferably has one - from the outside of the oil pan 100 seen here - convex curvature.

The oil drain hole 174 is preferably on one in the installed state of the oil pan 100 lowest point of the ground 140 of the basic body 102 arranged.

As best seen from the perspective view of the 18th can be seen is on the inside of the deep area 104 of the basic body 102 , the oil drain hole 174 surrounding a shot 186 for one in the 20th and 21 separately shown closure element 188 to close the oil drain opening 174 intended.

The recording 186 comprises an annular support 190 that of several, for example four, of the floor 140 of the deep area 104 of the basic body 102 from up to the interior of the deep area 104 protruding supports 192 is supported.

Between the supports 192 are through openings 194 formed, which extends down at least to the top of the floor 140 extend so that oil from the interior of the Basic body 102 through these openings 194 completely in the oil drain opening 174 can drain and thus the interior of the base body 102 can be substantially completely emptied of oil.

From the ring-shaped carrier 190 stand, each in the area between two supports 192 , two guide elements on the receiving side 196 in the form of leadership ledges 198 in (related to the central axis of the oil drain opening 174 ) radial direction in the interior of the annular carrier 190 in front.

How best to look 19 can be seen, the two receiving-side guide elements face each other 196 essentially diametrically opposite.

At an angular distance of approximately 90 ° from the guide elements on the receiving side 196 , along the circumferential direction of the annular carrier 190 , are between the two receiving-side guide elements 196 two hook-shaped spring elements 200 arranged, which is from a top 202 of the ring-shaped carrier 190 extend upwards and, as in the 23 and 25th shown, the closure element 188 reach over in its closed position.

The shot described above 186 for the closure element 188 is preferably in one piece and in particular in one piece with the base body 102 the oil pan 100 educated.

The closure element 188 includes how best from the 20th and 21 you can see a lower head section 204 , an upper, substantially cylindrical guide section 206 and the guide section 206 with the head section 204 connecting sealing section 208 ,

The head section 204 is used to operate the locking element 188 and has a central engagement opening for this purpose 210 in which an actuating tool can engage around the closure element 188 around its longitudinal axis 212 to turn.

This intervention opening 210 can, for example, be of polygonal design in order to be able to interact with an actuating tool with a polygonal cross section that is designed to be complementary thereto.

In addition, the head section 204 on its perimeter with two stops 213 provided which the rotational movement of the closure element 188 stop when the closing position of the closure element 188 is reached to prevent overtightening of the closure element.

The sealing section 208 has an annular groove running in the circumferential direction 214 in which a sealing ring 216 , preferably made of an elastomeric material.

The sealing ring 216 lies in the in 25th in the vertical cross section shown closing position of the closure element 188 on a peripheral wall 218 the oil drain hole 174 sealing, so that the oil drains from the oil pan 100 in the closed position of the closure element 188 is prevented.

The leadership section 206 of the closure element 188 has two closure elements on the closure element side 220 in the form of a guide channel 222 in each of which one of the receiving-side guide elements 196 in the form of a leadership lead 198 can intervene.

Every leadership channel 222 has one on an upper face 224 of the closure element 188 mouth introductory section 226 on which is from the outer edge of the face 224 essentially parallel to the longitudinal axis 212 of the closure element 188 extends downward.

To insert the guide element on the receiving side 196 in the guide channel 222 is to facilitate this introductory section 226 at its upper end with the insertion section 226 to the face 224 towards the bevel 228 Mistake.

At the insertion section 226 of the guide channel 222 a spiral section-shaped rotary section closes 230 of the guide channel 222 on. If the receiving guide element 196 in this shooting section 230 of the guide channel 222 engages, so causes a rotation of the closure element 188 around its longitudinal axis 212 at the same time a movement of the closure element 188 along the longitudinal axis 212 relative to the recording 186 upward, so the sealing section 208 of the closure element 188 into the oil drain hole 174 is pulled in and the sealing ring 216 for contact with the peripheral wall 218 the oil drain hole 174 is coming.

To the lower end of the rotating section 230 of the guide channel 222 a locking section closes 232 in which the top margin 234 of the guide channel 222 towards the top 234 at the bottom of the rotating section 230 in the direction of the longitudinal axis 212 of the closure element 188 up by the height of a step 236 is offset, so that the closure element 188 when it has been turned so far that the receiving-side guide element 196 the rest section 232 of the guide channel 222 achieved by the of the spring elements 200 the recording 186 on the face 224 of the closure element 188 elastic preload applied slightly along the longitudinal axis 212 is moved downward, so that the receiving-side guide element 196 in the rest section 232 of the guide channel 222 locked and through the step 236 at the top 234 of the guide channel 222 on a return to the shooting section 230 of the guide channel 222 is hindered.

A development of the top margin 234 of the guide channel 222 of the closure element 188 in a specific embodiment with exemplary dimensions (in millimeters) is in 22 shown.

From this it can be seen that the inclination of the rotary section 230 of the guide channel 222 relative to the top face 224 of the closure element 188 for example, can be approximately 6.5 °.

The height of the step (perpendicular to the top edge 234 of the guide channel 222 measured) can be, for example, approximately 0.6 mm.

The two guide channels 222 of the closure element 188 are identical to each other and in the circumferential direction of the closure element 188 offset from each other by an angle of 180 °.

When inserting the closure element 188 into the oil drain hole 174 the guide elements on the receiving side 196 the recording 186 through the insertion sections 226 in the assigned guide channel 222 , By pushing in the locking element 188 into the oil drain hole 174 along the longitudinal axis 212 the guide elements on the receiving side 196 through the insertion section 226 down to the shooting section 230 of the assigned guide channel 222 ,

By a subsequent rotation of the closure element 188 by means of one in the engagement opening 210 of the head section 204 engaging actuating tool through an angle of, for example, more than 90 ° passes through each receiving-side guide element 196 the shooting section 230 the assigned guide channel 222 , causing the closure element 188 further into the oil drain hole 174 is drawn in to seal them.

Finally, each receiving element reaches the guide element 196 the respectively assigned locking section 232 so that the closure element 188 in the closed position with the holder 186 is locked.

Due to the downward elastic prestressing force of the elastic spring elements 200 which are in contact with the upper face 224 of the closure element 188 stand, the closure element 188 held in this closed position.

The closure element 188 and the recording 186 Together they form a spring-loaded bayonet catch for the oil drain opening 174 ,

How best from the 24 it can be seen which the closure element 188 shows in its closed position, the stops 213 of the head section 204 of the closure element 188 in the closed position on an associated, on the base body 102 the oil pan 100 arranged counterstop 237 so that the closure element 188 not beyond the closed position relative to the receptacle 186 can be rotated and thus damage the recording 186 and / or the closure element 188 by overtightening the closure element in this way 188 is excluded.

To the closure element 188 again from the oil drain opening 174 To remove this elastic preload of the spring elements 200 be overcome by a correspondingly high torque, so that the receiving-side guide elements 196 relative to the guide channel 222 about the stage 236 of the top edge 234 of the guide channel 222 away in the respective shooting section 230 of the guide channel 222 can be moved.

After overcoming this initial resistance, which the closure element 188 secures against unintentional moving out of the closed position, the receiving-side guide elements 196 by rotating the closure element 188 about its longitudinal axis 212 in the insertion section 226 of the respective guide channel 222 be moved back. This is a release position of the closure element 188 reached in which the closure element 188 by subtracting from the recording 186 along the longitudinal axis 212 down completely from the shot 186 and thus completely from the basic body 102 the oil pan 100 is solvable.

To achieve the closure element 188 when changing the oil in the oil that has flowed into an oil collecting container, it does not sink, but floats, so that it can be easily removed from the drained oil and the installer removes the closure element from the oil pan when changing the oil 188 can safely drop into the oil collecting container, it is preferably provided that the closure element 188 has an average specific gravity which is less than the specific gravity in the oil pan 100 engine oil to be absorbed.

Since the specific weight of engine oils to be used in motor vehicles is usually in the range from approximately 0.8 g / cm ³ to approximately 0.95 g / cm ³ , the mean specific weight of the closure element is 188 preferably at most about 0.7 g / cm ³ , in particular at most about 0.5 g / cm ³ .

To the desired low average specific weight of the closure element 188 To provide, it can in particular be provided that in the interior of the closure element 188 a cavity (not shown) is formed, the volume of which is in relation to the total volume of the closure element 188 is so large that taking into account the specific weight of the for the manufacture of the closure element 188 used material the average specific weight of the entire closure element 188 including the cavity takes the desired value, so that the closure element 188 floats in engine oil, so that a significant part of the closure element 188 protrudes from the engine oil.

Such a closure element 188 can in particular be designed as a plastic injection-molded part, which is made by the known internal gas pressure injection molding ( GID ) will be produced.

Gas injection molding is basically a normal injection molding process, but with the difference that towards the end of the process of filling the mold cavity of the injection mold, an inert gas (for example nitrogen) is injected into the mold cavity under pressure. The gas displaces the plastic melt and, due to a relatively high gas pressure, causes the plastic melt to be pressed against the wall of the mold cavity and forms a jacket there, which is closed after the withdrawal of an injection needle for the gas supply. Gas injection molding makes it possible to produce relatively thick-walled plastic parts with cavities in them, with good surface quality and at low cost.

Alternatively, the closure element 188 be composed of two individual parts produced in a simple conventional injection molding process, which together form the internal cavity of the closure element 188 enclose between them and are connected to each other, for example by gluing or thermal welding.

How best from the 1 and 26 to 28 can be seen, includes the oil pan 100 an oil suction device 238 with one in the main body 102 molded implementation 240 , preferably on one of the side walls 145 of the deep area 104 of the basic body 102 is arranged, and one separate from the base body 102 manufactured oil suction pipe 242 , which is characterized by the implementation 240 through from an outside space 244 of the basic body 102 in its interior 246 extends into it.

How best to look 27 you can see the oil suction pipe 242 at his in the outside space 244 arranged upper end with a connector 248 which has a connection profile that widens conically towards the bottom 250 has, via which an (not shown) oil suction line on the connecting part 248 can be pushed on to the oil suction line by frictional connection and / or by positive connection with the connecting part 248 of the oil suction pipe 242 connect to.

In the longitudinal axis 252 of the oil suction pipe 242 seen below the connector 248 is on the oil suction pipe 242 one radial to the longitudinal axis 252 support collar protruding outwards 254 trained whose bottom 256 essentially flat on a top 258 the implementation 240 and the oil suction pipe 242 supports in the assembled state.

How best to look 28 can be seen is the support covenant 254 non-rotationally symmetrical; namely, it has a positioning recess at one point on its circumference 260 in which in the assembled state of the oil suction pipe 242 a complementary positioning lead 262 of the basic body 102 engages so that the oil suction pipe 242 twist-proof on the bushing 240 is held.

The positioning recess 260 of the oil suction pipe 242 and the positioning lead 262 of the basic body 102 together form an anti-twist device 264 for the oil suction pipe 242 ,

In the direction of the longitudinal axis 252 downward joins the support band 254 of the oil suction pipe 242 a sealing section 266 which has an annular groove 268 is provided which has a sealing ring 270 records.

The sealing ring 270 is formed for example from an elastomeric material and lies on an inner peripheral surface of the bushing 240 sealing to prevent oil from escaping from the interior 246 of the basic body 102 by performing 240 is excluded.

At the sealing section 266 of the oil suction pipe 242 closes along the longitudinal axis 252 down a rest section 272 which one with several, for example three, along the circumferential direction of the oil suction pipe 242 locking projections arranged at an angular distance from one another 274 is provided in to the longitudinal axis 252 point radially outwards.

These locking tabs 274 reach behind in the assembled state of the oil suction pipe 242 each a spring-elastic locking tongue 276 that are integral with the body 102 the oil pan 100 is trained.

When inserting the oil suction pipe 242 by performing 240 the latches give way 276 in the radial direction to the locking projections 274 of the oil suction pipe 242 to let happen.

Then the locking tongues move 276 due to their formula elasticity back to their starting position, so that they move back the locking projections 274 by performing 240 prevent and the oil suction pipe 242 directly with the body 102 is locked.

The locking tongues thus form 276 Basic elements on the body side 278 and the locking tabs 274 tube-side locking elements 280 one as a whole with 282 designated locking device through which the oil suction pipe 242 with the implementation 240 of the basic body 102 can be locked.

How best to look 26 can be seen, the lower end of the oil suction pipe is supported 242 in the assembled state on a, preferably curved, contact surface 284 from which on a rib 286 is trained in the ground 140 of the deep area 104 of the basic body 102 is molded.

A portion of the outer peripheral surface of the oil suction pipe 242 is in the assembled state of the oil suction pipe 242 on a support surface curved in the shape of a cylinder jacket section 288 at one end of one in the ground 140 of the deep area 104 of the basic body 102 molded to the support surface 288 ramp going up 290 is trained.

The distance between the contact surface 284 on the ground 140 of the basic body 102 and the locking elements on the basic body side 278 on the one hand and the length of the oil suction pipe 242 below the tube-side locking elements 280 on the other hand, are coordinated so that the oil suction pipe 242 under a preload between the locking elements on the basic body side 278 and the floor 140 of the basic body 102 is clamped.

This clamping between the implementation 240 and the floor 140 the oil pan 100 is the oil suction pipe 242 in its position relative to the base body 102 fixed.

Here is the oil suction pipe 242 through the clamping force to the support surface 288 curved so that it clings to the same and thus against lateral slipping relative to the support surface 288 is secured.

The insertion of the oil suction pipe 242 in this clamping position on the base body 102 is facilitated by the oil suction pipe 242 even before assembly on the base body 102 is provided with a slight pre-curvature in such a way that the longitudinal axis 252 the lower section of the oil suction pipe 242 to that of the positioning recess 260 on the support collar 254 opposite side of the oil suction pipe 242 is bulged out.

This pre-bend of the oil suction pipe 242 facilitates the insertion of the lower end of the oil suction pipe 242 in the clamped position on the contact surface 284 and on the support surface 288 of the floor 140 ,

The oil suction pipe 242 is preferably made from a thermoplastic material, in particular from a polyamide, for example from the polyamide 6.6 , educated.

It is particularly favorable if the oil suction pipe 242 is formed from a glass fiber reinforced plastic material, in particular from a glass fiber reinforced polyamide.

The oil suction pipe 242 is preferably formed in one piece.

The oil suction pipe 242 can be produced in particular by an injection molding process.

Even the basic body 102 the oil pan 100 is preferably formed in one piece.

The basic body 102 is preferably made of a thermoplastic material, for example of a polyamide, in particular of the polyamide 6.6 , educated.

It is further preferably provided that the base body 102 is formed from a glass fiber reinforced plastic material, in particular from a glass fiber reinforced polyamide.

The basic body 102 can be produced in an injection molding process, in particular in a cascade injection molding process.

Such a cascade injection molding process is shown schematically in 29 shown.

The method is made by means of a multi-part, to the desired shape of the base body to be produced 102 Complementary injection mold carried out, which one of the basic body to be formed 102 corresponding cavity 292 encloses.

The cavity 292 is a flowable starting material, in particular molten plastic material, by means of several nozzles 294 feedable which in 29 as nozzles 1 to 5 are numbered consecutively.

The nozzles 294 either flow directly into the cavity 292 as in the case of the nozzles 2 to 5 , or, as in the case of the nozzle 1 , into a feed line 296 , which branches and at several, for example two, outlet openings 298 into the cavity 292 flows.

How from 29 can be seen, the outlet openings open 298 the feed line 296 to which the nozzle 1 is connected, preferably in a flange area 300 the cavity 292 , which the mounting flange 150 of the basic body to be formed 102 equivalent.

The cavity is molded in a cascade injection molding process 292 the injection mold through the nozzles 1 to 5 sequentially filled with the flowable starting material, the nozzles being opened one after the other by a control device (not shown), by means of which closing devices (for example electromagnetic valves) of the nozzles can be controlled, in such a way that the flow front 302 of the starting material in the cavity 292 , starting from a previously opened nozzle, has already reached the newly opened nozzle or has already passed before this further nozzle is opened.

In this way, only a single flow front moves 302 of the starting material in a filling direction 304 through the cavity 292 , and there are no weld lines that occur in the conventional injection molding process where the flow fronts of the starting material coming from different, simultaneously open nozzles meet.

In a preferred embodiment of the cascade injection molding process, the cavity 292 the injection mold sequentially along a filling direction 304 filled which of the the deep area 104 of the basic body to be manufactured 102 opposite end area 306 of the flat area 106 of the basic body 102 to the front wall 142 of the deep area 104 of the basic body to be manufactured 102 points.

For this purpose, the outlet openings of the nozzles 1 to 5 in the fill direction 304 successively on the cavity 292 arranged and are opened one after the other in the order in which they are along the filling direction 304 successive.

The filling process therefore begins with the opening of the nozzle 1 whose outlet openings 298 in the flange area 300 the cavity 292 flow out.

From the outlet openings 298 the nozzle 1 outgoing has the flow front 302 after a filling time of, for example, 1.8 seconds, the in 29 through the broken line 302a marked position reached and thus the outlet opening of the nozzle 2 already happened.

At this point the nozzle 2 opened to further starting material in the cavity 292 bring in.

After a total filling time of 2.9 seconds, for example, the flow front 302 of the starting material the in 29 through the broken line 302b marked position reached and thus already the outlet opening of the nozzle 3 happens.

At this point the nozzle 3 opened to further starting material in the cavity 292 bring in.

After a total filling time of 5.4 seconds, for example, the flow front 302 in the 29 through the dash-dotted line 302c marked position reached and thus the outlet opening of the nozzle 4 already happened.

At this point the nozzle 4 opened to further starting material in the cavity 292 bring in.

After a total filling time of 8.0 seconds, for example, the flow front has 302 of the starting material the in 29 through the dash-dotted line 302d marked position reached and thus already the outlet opening of the nozzle 5 happens.

At this point the nozzle 5 opened to further starting material in the cavity 292 bring in.

After a total filling time of approximately 10.9 seconds, for example, the entire cavity 292 filled with the flowable starting material so that the nozzles 294 closed and the base body made of the starting material 102 after cooling and solidifying can be removed from the multi-part injection mold.

The opening times of the nozzles 294 can be predefined so that the opening of the nozzles is time-controlled.

As an alternative to this, provision can also be made for the opening of the nozzles to be flow-controlled, ie a new nozzle is opened when the cavity is opened 292 supplied amount of the flowable starting material has reached a certain value.

To make this possible, there is a feed line for the starting material to the nozzles 294 a flow rate measuring device is provided.

It is also possible to open the nozzles 294 perform pressure controlled. This is inside the cavity 292 at least one (not shown) pressure sensor is provided, which the internal pressure in the cavity 292 measures which increases when the flow front 302 reached the pressure sensor.

To control the opening times of several nozzles, there are preferably a plurality of pressure sensors in the cavity 292 arranged, which are each assigned to one of the nozzles to be controlled.

By making the cavity 292 in one with the longitudinal direction 108 of the basic body 102 matching filling direction 304 successively filled, the use of a starting material containing fibers means that the fibers, in particular glass fibers, predominantly essentially parallel to the longitudinal direction 108 of the basic body 102 are aligned.

In particular, it can be achieved that the fibers in the mounting flange 150 of the basic body 102 essentially parallel to the longitudinal direction 108 of the basic body 102 are aligned. This results in a particularly high mechanical stability of the mounting flange 150 achieved.

By having the nozzle 294 , which first opens the raw material into the flange area 300 the cavity 292 introduces, the filling of the flange area is achieved 300 the cavity 292 before filling the remaining areas of the cavity 292 is completed, so that the formation of weld lines in the mechanically particularly stressed mounting flange 150 of the basic body to be manufactured 102 is avoided.

The cascade injection molding process used also ensures that the base body produced in this way 102 the oil pan 100 after demoulding, the side walls are less inclined to the longitudinal median plane 138 has.

One in 30th in a schematic vertical cross section through the flat area 106 of the basic body 102 illustrated second embodiment of a base body 102 the oil pan 100 differs from the first embodiment described above in that the offset bottom section 118 of the floor 114 of the flat area 106 of the basic body 102 opposite the side floor sections 116 of the floor 114 not upwards, but downwards, to the outer space of the basic body 102 towards, is offset, so that from the offset bottom section 118 and the two adjacent connecting sections 122 formed bead 124 down over the bottom of the floor 114 of the flat area 106 of the basic body 102 protrudes.

In this embodiment, the connecting portions 122 through coupling elements 126 in the form of cross ribs 128 , each of which has a side edge 308 of the offset floor section 118 up to the nearest side wall 110 of the flat area 106 extend to the side walls 110 coupled, whereby the natural frequencies of the flat region are the same as in the first embodiment 106 of the basic body 102 be shifted to higher frequencies.

In this second embodiment, too, an acoustic optimization is thus achieved which reduces the noise and the mechanical stability of the base body 102 elevated.

The coupling elements too 126 the second embodiment are preferably completely outside of the interior of the base body 102 , only on the outside, arranged to the oil flow in the interior of the body 102 not to hinder.

Incidentally, the in 30th illustrated second embodiment of a base body 102 the oil pan 100 with regard to structure, function, manufacturing material and manufacturing method with the in the 1 to 29 illustrated first embodiment, to the above description of which reference is made.

Claims (7)

An oil pan comprising a deep region (104) and a flat region (106) extending in a longitudinal direction (108) of the oil pan (100) away from the deep region (104), the flat region (106) facing side walls (110) and a die The side walls (110) have a connecting floor (114), the floor (114) of the flat area (106) having two side floor sections (116) adjacent to the side walls (110) and an offset floor section (118) arranged between the side floor sections (116) ), wherein the offset bottom section (118) is arranged substantially centrally on the bottom (114) of the flat region (106) of the oil pan (100), the offset bottom section (118) being substantially mirror-symmetrical to an in the installed state of the oil pan ( 100) is formed vertically and along the longitudinal direction (108) of the oil pan (100), the longitudinal center plane (138) of the oil pan (100) and the offset bottom section (118) in the installed state of the oil pan (100) in the vertical direction (120) compared to the lateral floor sections (116) is offset upwards, the offset floor section (118) via one in each case in the installed state of the oil pan (100) against the horizontal only connecting portion (122) is connected to each of the side bottom portions (116), each connecting portion (122) by more than two coupling elements (126) spaced apart in the longitudinal direction (108) of the oil pan (100), with the other Connecting section (122) is coupled and at least one coupling element (126) does not extend into the interior of the oil pan (100), the oil pan (100) being an integral base body (102) which covers the entire flat area (106) of the oil pan ( 100), which comprises the deep region (104) of the oil pan (100) and the coupling elements (126), the base body (102) of the oil pan (100) being formed from a thermoplastic material, the offset base section (118) being together with the two adjacent connecting sections (122) forms a bead (124) which is formed in the bottom (114) of the flat region (106) of the base body (102) and which is at a distance from a back tail wall (112) of the flat region (106) of the base body (102) ends, and wherein the coupling elements (126) are designed as transverse ribs (128) extending transversely to the longitudinal direction (108) of the oil pan (100), which together form a transverse belt ( 130), which extends over the entire width of the bottom (114) of the flat region (106) and thus couples the two side walls (110) to one another and to the connecting sections (122). Oil pan after Claim 1 , characterized in that at least one coupling element (126) is designed as a transverse rib (128) extending essentially perpendicular to the longitudinal direction (108) of the oil pan (100). Oil pan after one of the Claims 1 or 2 , characterized in that the distance (d) of the coupling elements (126) in the longitudinal direction (108) of the oil pan (100) is greater than the extent of a coupling element (126) in the longitudinal direction (108) of the oil pan (100). Oil pan after one of the Claims 1 to 3 , characterized in that two or more coupling elements (126) are provided which are aligned essentially parallel to one another. Oil pan after one of the Claims 1 to 4 , characterized in that at least one coupling element (126) on the outside of the oil pan (100) projects beyond the bottom of the flat region (106) of the oil pan (100). Oil pan after one of the Claims 1 to 5 , characterized in that the offset bottom portion (118) extends in the longitudinal direction (108) of the oil pan (100) over at least half the length of the flat region (106) of the oil pan (100). Oil pan after one of the Claims 1 to 6 , characterized in that the offset base section (118) extends in a transverse direction (132) of the oil pan (100) which runs horizontally perpendicular to the longitudinal direction (108) of the oil pan (100) and in the installed state of the oil pan (100) over at least one sixth of the distance extends between the side walls (110) of the flat region (106) of the oil pan (100).

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